FFmpeg  4.4
avcodec.h
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1 /*
2  * copyright (c) 2001 Fabrice Bellard
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
23 
24 /**
25  * @file
26  * @ingroup libavc
27  * Libavcodec external API header
28  */
29 
30 #include <errno.h>
31 #include "libavutil/samplefmt.h"
32 #include "libavutil/attributes.h"
33 #include "libavutil/avutil.h"
34 #include "libavutil/buffer.h"
35 #include "libavutil/cpu.h"
37 #include "libavutil/dict.h"
38 #include "libavutil/frame.h"
39 #include "libavutil/hwcontext.h"
40 #include "libavutil/log.h"
41 #include "libavutil/pixfmt.h"
42 #include "libavutil/rational.h"
43 
44 #include "bsf.h"
45 #include "codec.h"
46 #include "codec_desc.h"
47 #include "codec_par.h"
48 #include "codec_id.h"
49 #include "packet.h"
50 #include "version.h"
51 
52 /**
53  * @defgroup libavc libavcodec
54  * Encoding/Decoding Library
55  *
56  * @{
57  *
58  * @defgroup lavc_decoding Decoding
59  * @{
60  * @}
61  *
62  * @defgroup lavc_encoding Encoding
63  * @{
64  * @}
65  *
66  * @defgroup lavc_codec Codecs
67  * @{
68  * @defgroup lavc_codec_native Native Codecs
69  * @{
70  * @}
71  * @defgroup lavc_codec_wrappers External library wrappers
72  * @{
73  * @}
74  * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
75  * @{
76  * @}
77  * @}
78  * @defgroup lavc_internal Internal
79  * @{
80  * @}
81  * @}
82  */
83 
84 /**
85  * @ingroup libavc
86  * @defgroup lavc_encdec send/receive encoding and decoding API overview
87  * @{
88  *
89  * The avcodec_send_packet()/avcodec_receive_frame()/avcodec_send_frame()/
90  * avcodec_receive_packet() functions provide an encode/decode API, which
91  * decouples input and output.
92  *
93  * The API is very similar for encoding/decoding and audio/video, and works as
94  * follows:
95  * - Set up and open the AVCodecContext as usual.
96  * - Send valid input:
97  * - For decoding, call avcodec_send_packet() to give the decoder raw
98  * compressed data in an AVPacket.
99  * - For encoding, call avcodec_send_frame() to give the encoder an AVFrame
100  * containing uncompressed audio or video.
101  *
102  * In both cases, it is recommended that AVPackets and AVFrames are
103  * refcounted, or libavcodec might have to copy the input data. (libavformat
104  * always returns refcounted AVPackets, and av_frame_get_buffer() allocates
105  * refcounted AVFrames.)
106  * - Receive output in a loop. Periodically call one of the avcodec_receive_*()
107  * functions and process their output:
108  * - For decoding, call avcodec_receive_frame(). On success, it will return
109  * an AVFrame containing uncompressed audio or video data.
110  * - For encoding, call avcodec_receive_packet(). On success, it will return
111  * an AVPacket with a compressed frame.
112  *
113  * Repeat this call until it returns AVERROR(EAGAIN) or an error. The
114  * AVERROR(EAGAIN) return value means that new input data is required to
115  * return new output. In this case, continue with sending input. For each
116  * input frame/packet, the codec will typically return 1 output frame/packet,
117  * but it can also be 0 or more than 1.
118  *
119  * At the beginning of decoding or encoding, the codec might accept multiple
120  * input frames/packets without returning a frame, until its internal buffers
121  * are filled. This situation is handled transparently if you follow the steps
122  * outlined above.
123  *
124  * In theory, sending input can result in EAGAIN - this should happen only if
125  * not all output was received. You can use this to structure alternative decode
126  * or encode loops other than the one suggested above. For example, you could
127  * try sending new input on each iteration, and try to receive output if that
128  * returns EAGAIN.
129  *
130  * End of stream situations. These require "flushing" (aka draining) the codec,
131  * as the codec might buffer multiple frames or packets internally for
132  * performance or out of necessity (consider B-frames).
133  * This is handled as follows:
134  * - Instead of valid input, send NULL to the avcodec_send_packet() (decoding)
135  * or avcodec_send_frame() (encoding) functions. This will enter draining
136  * mode.
137  * - Call avcodec_receive_frame() (decoding) or avcodec_receive_packet()
138  * (encoding) in a loop until AVERROR_EOF is returned. The functions will
139  * not return AVERROR(EAGAIN), unless you forgot to enter draining mode.
140  * - Before decoding can be resumed again, the codec has to be reset with
141  * avcodec_flush_buffers().
142  *
143  * Using the API as outlined above is highly recommended. But it is also
144  * possible to call functions outside of this rigid schema. For example, you can
145  * call avcodec_send_packet() repeatedly without calling
146  * avcodec_receive_frame(). In this case, avcodec_send_packet() will succeed
147  * until the codec's internal buffer has been filled up (which is typically of
148  * size 1 per output frame, after initial input), and then reject input with
149  * AVERROR(EAGAIN). Once it starts rejecting input, you have no choice but to
150  * read at least some output.
151  *
152  * Not all codecs will follow a rigid and predictable dataflow; the only
153  * guarantee is that an AVERROR(EAGAIN) return value on a send/receive call on
154  * one end implies that a receive/send call on the other end will succeed, or
155  * at least will not fail with AVERROR(EAGAIN). In general, no codec will
156  * permit unlimited buffering of input or output.
157  *
158  * This API replaces the following legacy functions:
159  * - avcodec_decode_video2() and avcodec_decode_audio4():
160  * Use avcodec_send_packet() to feed input to the decoder, then use
161  * avcodec_receive_frame() to receive decoded frames after each packet.
162  * Unlike with the old video decoding API, multiple frames might result from
163  * a packet. For audio, splitting the input packet into frames by partially
164  * decoding packets becomes transparent to the API user. You never need to
165  * feed an AVPacket to the API twice (unless it is rejected with AVERROR(EAGAIN) - then
166  * no data was read from the packet).
167  * Additionally, sending a flush/draining packet is required only once.
168  * - avcodec_encode_video2()/avcodec_encode_audio2():
169  * Use avcodec_send_frame() to feed input to the encoder, then use
170  * avcodec_receive_packet() to receive encoded packets.
171  * Providing user-allocated buffers for avcodec_receive_packet() is not
172  * possible.
173  * - The new API does not handle subtitles yet.
174  *
175  * Mixing new and old function calls on the same AVCodecContext is not allowed,
176  * and will result in undefined behavior.
177  *
178  * Some codecs might require using the new API; using the old API will return
179  * an error when calling it. All codecs support the new API.
180  *
181  * A codec is not allowed to return AVERROR(EAGAIN) for both sending and receiving. This
182  * would be an invalid state, which could put the codec user into an endless
183  * loop. The API has no concept of time either: it cannot happen that trying to
184  * do avcodec_send_packet() results in AVERROR(EAGAIN), but a repeated call 1 second
185  * later accepts the packet (with no other receive/flush API calls involved).
186  * The API is a strict state machine, and the passage of time is not supposed
187  * to influence it. Some timing-dependent behavior might still be deemed
188  * acceptable in certain cases. But it must never result in both send/receive
189  * returning EAGAIN at the same time at any point. It must also absolutely be
190  * avoided that the current state is "unstable" and can "flip-flop" between
191  * the send/receive APIs allowing progress. For example, it's not allowed that
192  * the codec randomly decides that it actually wants to consume a packet now
193  * instead of returning a frame, after it just returned AVERROR(EAGAIN) on an
194  * avcodec_send_packet() call.
195  * @}
196  */
197 
198 /**
199  * @defgroup lavc_core Core functions/structures.
200  * @ingroup libavc
201  *
202  * Basic definitions, functions for querying libavcodec capabilities,
203  * allocating core structures, etc.
204  * @{
205  */
206 
207 /**
208  * @ingroup lavc_decoding
209  * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
210  * This is mainly needed because some optimized bitstream readers read
211  * 32 or 64 bit at once and could read over the end.<br>
212  * Note: If the first 23 bits of the additional bytes are not 0, then damaged
213  * MPEG bitstreams could cause overread and segfault.
214  */
215 #define AV_INPUT_BUFFER_PADDING_SIZE 64
216 
217 /**
218  * @ingroup lavc_encoding
219  * minimum encoding buffer size
220  * Used to avoid some checks during header writing.
221  */
222 #define AV_INPUT_BUFFER_MIN_SIZE 16384
223 
224 /**
225  * @ingroup lavc_decoding
226  */
228  /* We leave some space between them for extensions (drop some
229  * keyframes for intra-only or drop just some bidir frames). */
230  AVDISCARD_NONE =-16, ///< discard nothing
231  AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
232  AVDISCARD_NONREF = 8, ///< discard all non reference
233  AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
234  AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
235  AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
236  AVDISCARD_ALL = 48, ///< discard all
237 };
238 
249  AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
250 };
251 
252 /**
253  * @ingroup lavc_encoding
254  */
255 typedef struct RcOverride{
258  int qscale; // If this is 0 then quality_factor will be used instead.
260 } RcOverride;
261 
262 /* encoding support
263  These flags can be passed in AVCodecContext.flags before initialization.
264  Note: Not everything is supported yet.
265 */
266 
267 /**
268  * Allow decoders to produce frames with data planes that are not aligned
269  * to CPU requirements (e.g. due to cropping).
270  */
271 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
272 /**
273  * Use fixed qscale.
274  */
275 #define AV_CODEC_FLAG_QSCALE (1 << 1)
276 /**
277  * 4 MV per MB allowed / advanced prediction for H.263.
278  */
279 #define AV_CODEC_FLAG_4MV (1 << 2)
280 /**
281  * Output even those frames that might be corrupted.
282  */
283 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
284 /**
285  * Use qpel MC.
286  */
287 #define AV_CODEC_FLAG_QPEL (1 << 4)
288 /**
289  * Don't output frames whose parameters differ from first
290  * decoded frame in stream.
291  */
292 #define AV_CODEC_FLAG_DROPCHANGED (1 << 5)
293 /**
294  * Use internal 2pass ratecontrol in first pass mode.
295  */
296 #define AV_CODEC_FLAG_PASS1 (1 << 9)
297 /**
298  * Use internal 2pass ratecontrol in second pass mode.
299  */
300 #define AV_CODEC_FLAG_PASS2 (1 << 10)
301 /**
302  * loop filter.
303  */
304 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
305 /**
306  * Only decode/encode grayscale.
307  */
308 #define AV_CODEC_FLAG_GRAY (1 << 13)
309 /**
310  * error[?] variables will be set during encoding.
311  */
312 #define AV_CODEC_FLAG_PSNR (1 << 15)
313 /**
314  * Input bitstream might be truncated at a random location
315  * instead of only at frame boundaries.
316  */
317 #define AV_CODEC_FLAG_TRUNCATED (1 << 16)
318 /**
319  * Use interlaced DCT.
320  */
321 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
322 /**
323  * Force low delay.
324  */
325 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
326 /**
327  * Place global headers in extradata instead of every keyframe.
328  */
329 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
330 /**
331  * Use only bitexact stuff (except (I)DCT).
332  */
333 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
334 /* Fx : Flag for H.263+ extra options */
335 /**
336  * H.263 advanced intra coding / MPEG-4 AC prediction
337  */
338 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
339 /**
340  * interlaced motion estimation
341  */
342 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
343 #define AV_CODEC_FLAG_CLOSED_GOP (1U << 31)
344 
345 /**
346  * Allow non spec compliant speedup tricks.
347  */
348 #define AV_CODEC_FLAG2_FAST (1 << 0)
349 /**
350  * Skip bitstream encoding.
351  */
352 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
353 /**
354  * Place global headers at every keyframe instead of in extradata.
355  */
356 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
357 
358 /**
359  * timecode is in drop frame format. DEPRECATED!!!!
360  */
361 #define AV_CODEC_FLAG2_DROP_FRAME_TIMECODE (1 << 13)
362 
363 /**
364  * Input bitstream might be truncated at a packet boundaries
365  * instead of only at frame boundaries.
366  */
367 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
368 /**
369  * Discard cropping information from SPS.
370  */
371 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
372 
373 /**
374  * Show all frames before the first keyframe
375  */
376 #define AV_CODEC_FLAG2_SHOW_ALL (1 << 22)
377 /**
378  * Export motion vectors through frame side data
379  */
380 #define AV_CODEC_FLAG2_EXPORT_MVS (1 << 28)
381 /**
382  * Do not skip samples and export skip information as frame side data
383  */
384 #define AV_CODEC_FLAG2_SKIP_MANUAL (1 << 29)
385 /**
386  * Do not reset ASS ReadOrder field on flush (subtitles decoding)
387  */
388 #define AV_CODEC_FLAG2_RO_FLUSH_NOOP (1 << 30)
389 
390 /* Unsupported options :
391  * Syntax Arithmetic coding (SAC)
392  * Reference Picture Selection
393  * Independent Segment Decoding */
394 /* /Fx */
395 /* codec capabilities */
396 
397 /* Exported side data.
398  These flags can be passed in AVCodecContext.export_side_data before initialization.
399 */
400 /**
401  * Export motion vectors through frame side data
402  */
403 #define AV_CODEC_EXPORT_DATA_MVS (1 << 0)
404 /**
405  * Export encoder Producer Reference Time through packet side data
406  */
407 #define AV_CODEC_EXPORT_DATA_PRFT (1 << 1)
408 /**
409  * Decoding only.
410  * Export the AVVideoEncParams structure through frame side data.
411  */
412 #define AV_CODEC_EXPORT_DATA_VIDEO_ENC_PARAMS (1 << 2)
413 /**
414  * Decoding only.
415  * Do not apply film grain, export it instead.
416  */
417 #define AV_CODEC_EXPORT_DATA_FILM_GRAIN (1 << 3)
418 
419 /**
420  * Pan Scan area.
421  * This specifies the area which should be displayed.
422  * Note there may be multiple such areas for one frame.
423  */
424 typedef struct AVPanScan {
425  /**
426  * id
427  * - encoding: Set by user.
428  * - decoding: Set by libavcodec.
429  */
430  int id;
431 
432  /**
433  * width and height in 1/16 pel
434  * - encoding: Set by user.
435  * - decoding: Set by libavcodec.
436  */
437  int width;
438  int height;
439 
440  /**
441  * position of the top left corner in 1/16 pel for up to 3 fields/frames
442  * - encoding: Set by user.
443  * - decoding: Set by libavcodec.
444  */
445  int16_t position[3][2];
446 } AVPanScan;
447 
448 /**
449  * This structure describes the bitrate properties of an encoded bitstream. It
450  * roughly corresponds to a subset the VBV parameters for MPEG-2 or HRD
451  * parameters for H.264/HEVC.
452  */
453 typedef struct AVCPBProperties {
454  /**
455  * Maximum bitrate of the stream, in bits per second.
456  * Zero if unknown or unspecified.
457  */
458 #if FF_API_UNSANITIZED_BITRATES
460 #else
461  int64_t max_bitrate;
462 #endif
463  /**
464  * Minimum bitrate of the stream, in bits per second.
465  * Zero if unknown or unspecified.
466  */
467 #if FF_API_UNSANITIZED_BITRATES
469 #else
470  int64_t min_bitrate;
471 #endif
472  /**
473  * Average bitrate of the stream, in bits per second.
474  * Zero if unknown or unspecified.
475  */
476 #if FF_API_UNSANITIZED_BITRATES
478 #else
479  int64_t avg_bitrate;
480 #endif
481 
482  /**
483  * The size of the buffer to which the ratecontrol is applied, in bits.
484  * Zero if unknown or unspecified.
485  */
487 
488  /**
489  * The delay between the time the packet this structure is associated with
490  * is received and the time when it should be decoded, in periods of a 27MHz
491  * clock.
492  *
493  * UINT64_MAX when unknown or unspecified.
494  */
495  uint64_t vbv_delay;
497 
498 /**
499  * This structure supplies correlation between a packet timestamp and a wall clock
500  * production time. The definition follows the Producer Reference Time ('prft')
501  * as defined in ISO/IEC 14496-12
502  */
503 typedef struct AVProducerReferenceTime {
504  /**
505  * A UTC timestamp, in microseconds, since Unix epoch (e.g, av_gettime()).
506  */
507  int64_t wallclock;
508  int flags;
510 
511 /**
512  * The decoder will keep a reference to the frame and may reuse it later.
513  */
514 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
515 
516 /**
517  * The encoder will keep a reference to the packet and may reuse it later.
518  */
519 #define AV_GET_ENCODE_BUFFER_FLAG_REF (1 << 0)
520 
521 struct AVCodecInternal;
522 
523 /**
524  * main external API structure.
525  * New fields can be added to the end with minor version bumps.
526  * Removal, reordering and changes to existing fields require a major
527  * version bump.
528  * You can use AVOptions (av_opt* / av_set/get*()) to access these fields from user
529  * applications.
530  * The name string for AVOptions options matches the associated command line
531  * parameter name and can be found in libavcodec/options_table.h
532  * The AVOption/command line parameter names differ in some cases from the C
533  * structure field names for historic reasons or brevity.
534  * sizeof(AVCodecContext) must not be used outside libav*.
535  */
536 typedef struct AVCodecContext {
537  /**
538  * information on struct for av_log
539  * - set by avcodec_alloc_context3
540  */
543 
544  enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
545  const struct AVCodec *codec;
546  enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
547 
548  /**
549  * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
550  * This is used to work around some encoder bugs.
551  * A demuxer should set this to what is stored in the field used to identify the codec.
552  * If there are multiple such fields in a container then the demuxer should choose the one
553  * which maximizes the information about the used codec.
554  * If the codec tag field in a container is larger than 32 bits then the demuxer should
555  * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
556  * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
557  * first.
558  * - encoding: Set by user, if not then the default based on codec_id will be used.
559  * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
560  */
561  unsigned int codec_tag;
562 
563  void *priv_data;
564 
565  /**
566  * Private context used for internal data.
567  *
568  * Unlike priv_data, this is not codec-specific. It is used in general
569  * libavcodec functions.
570  */
571  struct AVCodecInternal *internal;
572 
573  /**
574  * Private data of the user, can be used to carry app specific stuff.
575  * - encoding: Set by user.
576  * - decoding: Set by user.
577  */
578  void *opaque;
579 
580  /**
581  * the average bitrate
582  * - encoding: Set by user; unused for constant quantizer encoding.
583  * - decoding: Set by user, may be overwritten by libavcodec
584  * if this info is available in the stream
585  */
586  int64_t bit_rate;
587 
588  /**
589  * number of bits the bitstream is allowed to diverge from the reference.
590  * the reference can be CBR (for CBR pass1) or VBR (for pass2)
591  * - encoding: Set by user; unused for constant quantizer encoding.
592  * - decoding: unused
593  */
595 
596  /**
597  * Global quality for codecs which cannot change it per frame.
598  * This should be proportional to MPEG-1/2/4 qscale.
599  * - encoding: Set by user.
600  * - decoding: unused
601  */
603 
604  /**
605  * - encoding: Set by user.
606  * - decoding: unused
607  */
609 #define FF_COMPRESSION_DEFAULT -1
610 
611  /**
612  * AV_CODEC_FLAG_*.
613  * - encoding: Set by user.
614  * - decoding: Set by user.
615  */
616  int flags;
617 
618  /**
619  * AV_CODEC_FLAG2_*
620  * - encoding: Set by user.
621  * - decoding: Set by user.
622  */
623  int flags2;
624 
625  /**
626  * some codecs need / can use extradata like Huffman tables.
627  * MJPEG: Huffman tables
628  * rv10: additional flags
629  * MPEG-4: global headers (they can be in the bitstream or here)
630  * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
631  * than extradata_size to avoid problems if it is read with the bitstream reader.
632  * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
633  * Must be allocated with the av_malloc() family of functions.
634  * - encoding: Set/allocated/freed by libavcodec.
635  * - decoding: Set/allocated/freed by user.
636  */
639 
640  /**
641  * This is the fundamental unit of time (in seconds) in terms
642  * of which frame timestamps are represented. For fixed-fps content,
643  * timebase should be 1/framerate and timestamp increments should be
644  * identically 1.
645  * This often, but not always is the inverse of the frame rate or field rate
646  * for video. 1/time_base is not the average frame rate if the frame rate is not
647  * constant.
648  *
649  * Like containers, elementary streams also can store timestamps, 1/time_base
650  * is the unit in which these timestamps are specified.
651  * As example of such codec time base see ISO/IEC 14496-2:2001(E)
652  * vop_time_increment_resolution and fixed_vop_rate
653  * (fixed_vop_rate == 0 implies that it is different from the framerate)
654  *
655  * - encoding: MUST be set by user.
656  * - decoding: the use of this field for decoding is deprecated.
657  * Use framerate instead.
658  */
660 
661  /**
662  * For some codecs, the time base is closer to the field rate than the frame rate.
663  * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
664  * if no telecine is used ...
665  *
666  * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
667  */
669 
670  /**
671  * Codec delay.
672  *
673  * Encoding: Number of frames delay there will be from the encoder input to
674  * the decoder output. (we assume the decoder matches the spec)
675  * Decoding: Number of frames delay in addition to what a standard decoder
676  * as specified in the spec would produce.
677  *
678  * Video:
679  * Number of frames the decoded output will be delayed relative to the
680  * encoded input.
681  *
682  * Audio:
683  * For encoding, this field is unused (see initial_padding).
684  *
685  * For decoding, this is the number of samples the decoder needs to
686  * output before the decoder's output is valid. When seeking, you should
687  * start decoding this many samples prior to your desired seek point.
688  *
689  * - encoding: Set by libavcodec.
690  * - decoding: Set by libavcodec.
691  */
692  int delay;
693 
694 
695  /* video only */
696  /**
697  * picture width / height.
698  *
699  * @note Those fields may not match the values of the last
700  * AVFrame output by avcodec_decode_video2 due frame
701  * reordering.
702  *
703  * - encoding: MUST be set by user.
704  * - decoding: May be set by the user before opening the decoder if known e.g.
705  * from the container. Some decoders will require the dimensions
706  * to be set by the caller. During decoding, the decoder may
707  * overwrite those values as required while parsing the data.
708  */
709  int width, height;
710 
711  /**
712  * Bitstream width / height, may be different from width/height e.g. when
713  * the decoded frame is cropped before being output or lowres is enabled.
714  *
715  * @note Those field may not match the value of the last
716  * AVFrame output by avcodec_receive_frame() due frame
717  * reordering.
718  *
719  * - encoding: unused
720  * - decoding: May be set by the user before opening the decoder if known
721  * e.g. from the container. During decoding, the decoder may
722  * overwrite those values as required while parsing the data.
723  */
725 
726  /**
727  * the number of pictures in a group of pictures, or 0 for intra_only
728  * - encoding: Set by user.
729  * - decoding: unused
730  */
731  int gop_size;
732 
733  /**
734  * Pixel format, see AV_PIX_FMT_xxx.
735  * May be set by the demuxer if known from headers.
736  * May be overridden by the decoder if it knows better.
737  *
738  * @note This field may not match the value of the last
739  * AVFrame output by avcodec_receive_frame() due frame
740  * reordering.
741  *
742  * - encoding: Set by user.
743  * - decoding: Set by user if known, overridden by libavcodec while
744  * parsing the data.
745  */
746  enum AVPixelFormat pix_fmt;
747 
748  /**
749  * If non NULL, 'draw_horiz_band' is called by the libavcodec
750  * decoder to draw a horizontal band. It improves cache usage. Not
751  * all codecs can do that. You must check the codec capabilities
752  * beforehand.
753  * When multithreading is used, it may be called from multiple threads
754  * at the same time; threads might draw different parts of the same AVFrame,
755  * or multiple AVFrames, and there is no guarantee that slices will be drawn
756  * in order.
757  * The function is also used by hardware acceleration APIs.
758  * It is called at least once during frame decoding to pass
759  * the data needed for hardware render.
760  * In that mode instead of pixel data, AVFrame points to
761  * a structure specific to the acceleration API. The application
762  * reads the structure and can change some fields to indicate progress
763  * or mark state.
764  * - encoding: unused
765  * - decoding: Set by user.
766  * @param height the height of the slice
767  * @param y the y position of the slice
768  * @param type 1->top field, 2->bottom field, 3->frame
769  * @param offset offset into the AVFrame.data from which the slice should be read
770  */
772  const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
773  int y, int type, int height);
774 
775  /**
776  * callback to negotiate the pixelFormat
777  * @param fmt is the list of formats which are supported by the codec,
778  * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
779  * The first is always the native one.
780  * @note The callback may be called again immediately if initialization for
781  * the selected (hardware-accelerated) pixel format failed.
782  * @warning Behavior is undefined if the callback returns a value not
783  * in the fmt list of formats.
784  * @return the chosen format
785  * - encoding: unused
786  * - decoding: Set by user, if not set the native format will be chosen.
787  */
788  enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
789 
790  /**
791  * maximum number of B-frames between non-B-frames
792  * Note: The output will be delayed by max_b_frames+1 relative to the input.
793  * - encoding: Set by user.
794  * - decoding: unused
795  */
797 
798  /**
799  * qscale factor between IP and B-frames
800  * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
801  * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
802  * - encoding: Set by user.
803  * - decoding: unused
804  */
806 
807 #if FF_API_PRIVATE_OPT
808  /** @deprecated use encoder private options instead */
811 #endif
812 
813  /**
814  * qscale offset between IP and B-frames
815  * - encoding: Set by user.
816  * - decoding: unused
817  */
819 
820  /**
821  * Size of the frame reordering buffer in the decoder.
822  * For MPEG-2 it is 1 IPB or 0 low delay IP.
823  * - encoding: Set by libavcodec.
824  * - decoding: Set by libavcodec.
825  */
827 
828 #if FF_API_PRIVATE_OPT
829  /** @deprecated use encoder private options instead */
832 #endif
833 
834  /**
835  * qscale factor between P- and I-frames
836  * If > 0 then the last P-frame quantizer will be used (q = lastp_q * factor + offset).
837  * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
838  * - encoding: Set by user.
839  * - decoding: unused
840  */
842 
843  /**
844  * qscale offset between P and I-frames
845  * - encoding: Set by user.
846  * - decoding: unused
847  */
849 
850  /**
851  * luminance masking (0-> disabled)
852  * - encoding: Set by user.
853  * - decoding: unused
854  */
856 
857  /**
858  * temporary complexity masking (0-> disabled)
859  * - encoding: Set by user.
860  * - decoding: unused
861  */
863 
864  /**
865  * spatial complexity masking (0-> disabled)
866  * - encoding: Set by user.
867  * - decoding: unused
868  */
870 
871  /**
872  * p block masking (0-> disabled)
873  * - encoding: Set by user.
874  * - decoding: unused
875  */
876  float p_masking;
877 
878  /**
879  * darkness masking (0-> disabled)
880  * - encoding: Set by user.
881  * - decoding: unused
882  */
884 
885  /**
886  * slice count
887  * - encoding: Set by libavcodec.
888  * - decoding: Set by user (or 0).
889  */
891 
892 #if FF_API_PRIVATE_OPT
893  /** @deprecated use encoder private options instead */
896 #define FF_PRED_LEFT 0
897 #define FF_PRED_PLANE 1
898 #define FF_PRED_MEDIAN 2
899 #endif
900 
901  /**
902  * slice offsets in the frame in bytes
903  * - encoding: Set/allocated by libavcodec.
904  * - decoding: Set/allocated by user (or NULL).
905  */
907 
908  /**
909  * sample aspect ratio (0 if unknown)
910  * That is the width of a pixel divided by the height of the pixel.
911  * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
912  * - encoding: Set by user.
913  * - decoding: Set by libavcodec.
914  */
916 
917  /**
918  * motion estimation comparison function
919  * - encoding: Set by user.
920  * - decoding: unused
921  */
922  int me_cmp;
923  /**
924  * subpixel motion estimation comparison function
925  * - encoding: Set by user.
926  * - decoding: unused
927  */
929  /**
930  * macroblock comparison function (not supported yet)
931  * - encoding: Set by user.
932  * - decoding: unused
933  */
934  int mb_cmp;
935  /**
936  * interlaced DCT comparison function
937  * - encoding: Set by user.
938  * - decoding: unused
939  */
941 #define FF_CMP_SAD 0
942 #define FF_CMP_SSE 1
943 #define FF_CMP_SATD 2
944 #define FF_CMP_DCT 3
945 #define FF_CMP_PSNR 4
946 #define FF_CMP_BIT 5
947 #define FF_CMP_RD 6
948 #define FF_CMP_ZERO 7
949 #define FF_CMP_VSAD 8
950 #define FF_CMP_VSSE 9
951 #define FF_CMP_NSSE 10
952 #define FF_CMP_W53 11
953 #define FF_CMP_W97 12
954 #define FF_CMP_DCTMAX 13
955 #define FF_CMP_DCT264 14
956 #define FF_CMP_MEDIAN_SAD 15
957 #define FF_CMP_CHROMA 256
958 
959  /**
960  * ME diamond size & shape
961  * - encoding: Set by user.
962  * - decoding: unused
963  */
964  int dia_size;
965 
966  /**
967  * amount of previous MV predictors (2a+1 x 2a+1 square)
968  * - encoding: Set by user.
969  * - decoding: unused
970  */
972 
973 #if FF_API_PRIVATE_OPT
974  /** @deprecated use encoder private options instead */
976  int pre_me;
977 #endif
978 
979  /**
980  * motion estimation prepass comparison function
981  * - encoding: Set by user.
982  * - decoding: unused
983  */
985 
986  /**
987  * ME prepass diamond size & shape
988  * - encoding: Set by user.
989  * - decoding: unused
990  */
992 
993  /**
994  * subpel ME quality
995  * - encoding: Set by user.
996  * - decoding: unused
997  */
999 
1000  /**
1001  * maximum motion estimation search range in subpel units
1002  * If 0 then no limit.
1003  *
1004  * - encoding: Set by user.
1005  * - decoding: unused
1006  */
1008 
1009  /**
1010  * slice flags
1011  * - encoding: unused
1012  * - decoding: Set by user.
1013  */
1015 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1016 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG-2 field pics)
1017 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1018 
1019  /**
1020  * macroblock decision mode
1021  * - encoding: Set by user.
1022  * - decoding: unused
1023  */
1025 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1026 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1027 #define FF_MB_DECISION_RD 2 ///< rate distortion
1028 
1029  /**
1030  * custom intra quantization matrix
1031  * Must be allocated with the av_malloc() family of functions, and will be freed in
1032  * avcodec_free_context().
1033  * - encoding: Set/allocated by user, freed by libavcodec. Can be NULL.
1034  * - decoding: Set/allocated/freed by libavcodec.
1035  */
1036  uint16_t *intra_matrix;
1037 
1038  /**
1039  * custom inter quantization matrix
1040  * Must be allocated with the av_malloc() family of functions, and will be freed in
1041  * avcodec_free_context().
1042  * - encoding: Set/allocated by user, freed by libavcodec. Can be NULL.
1043  * - decoding: Set/allocated/freed by libavcodec.
1044  */
1045  uint16_t *inter_matrix;
1046 
1047 #if FF_API_PRIVATE_OPT
1048  /** @deprecated use encoder private options instead */
1051 
1052  /** @deprecated use encoder private options instead */
1055 #endif
1056 
1057  /**
1058  * precision of the intra DC coefficient - 8
1059  * - encoding: Set by user.
1060  * - decoding: Set by libavcodec
1061  */
1063 
1064  /**
1065  * Number of macroblock rows at the top which are skipped.
1066  * - encoding: unused
1067  * - decoding: Set by user.
1068  */
1070 
1071  /**
1072  * Number of macroblock rows at the bottom which are skipped.
1073  * - encoding: unused
1074  * - decoding: Set by user.
1075  */
1077 
1078  /**
1079  * minimum MB Lagrange multiplier
1080  * - encoding: Set by user.
1081  * - decoding: unused
1082  */
1083  int mb_lmin;
1084 
1085  /**
1086  * maximum MB Lagrange multiplier
1087  * - encoding: Set by user.
1088  * - decoding: unused
1089  */
1090  int mb_lmax;
1091 
1092 #if FF_API_PRIVATE_OPT
1093  /**
1094  * @deprecated use encoder private options instead
1095  */
1098 #endif
1099 
1100  /**
1101  * - encoding: Set by user.
1102  * - decoding: unused
1103  */
1105 
1106 #if FF_API_PRIVATE_OPT
1107  /** @deprecated use encoder private options instead */
1110 #endif
1111 
1112  /**
1113  * minimum GOP size
1114  * - encoding: Set by user.
1115  * - decoding: unused
1116  */
1118 
1119  /**
1120  * number of reference frames
1121  * - encoding: Set by user.
1122  * - decoding: Set by lavc.
1123  */
1124  int refs;
1125 
1126 #if FF_API_PRIVATE_OPT
1127  /** @deprecated use encoder private options instead */
1130 #endif
1131 
1132  /**
1133  * Note: Value depends upon the compare function used for fullpel ME.
1134  * - encoding: Set by user.
1135  * - decoding: unused
1136  */
1138 
1139 #if FF_API_PRIVATE_OPT
1140  /** @deprecated use encoder private options instead */
1143 #endif
1144 
1145  /**
1146  * Chromaticity coordinates of the source primaries.
1147  * - encoding: Set by user
1148  * - decoding: Set by libavcodec
1149  */
1151 
1152  /**
1153  * Color Transfer Characteristic.
1154  * - encoding: Set by user
1155  * - decoding: Set by libavcodec
1156  */
1158 
1159  /**
1160  * YUV colorspace type.
1161  * - encoding: Set by user
1162  * - decoding: Set by libavcodec
1163  */
1164  enum AVColorSpace colorspace;
1165 
1166  /**
1167  * MPEG vs JPEG YUV range.
1168  * - encoding: Set by user
1169  * - decoding: Set by libavcodec
1170  */
1172 
1173  /**
1174  * This defines the location of chroma samples.
1175  * - encoding: Set by user
1176  * - decoding: Set by libavcodec
1177  */
1179 
1180  /**
1181  * Number of slices.
1182  * Indicates number of picture subdivisions. Used for parallelized
1183  * decoding.
1184  * - encoding: Set by user
1185  * - decoding: unused
1186  */
1187  int slices;
1188 
1189  /** Field order
1190  * - encoding: set by libavcodec
1191  * - decoding: Set by user.
1192  */
1194 
1195  /* audio only */
1196  int sample_rate; ///< samples per second
1197  int channels; ///< number of audio channels
1198 
1199  /**
1200  * audio sample format
1201  * - encoding: Set by user.
1202  * - decoding: Set by libavcodec.
1203  */
1204  enum AVSampleFormat sample_fmt; ///< sample format
1205 
1206  /* The following data should not be initialized. */
1207  /**
1208  * Number of samples per channel in an audio frame.
1209  *
1210  * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
1211  * except the last must contain exactly frame_size samples per channel.
1212  * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
1213  * frame size is not restricted.
1214  * - decoding: may be set by some decoders to indicate constant frame size
1215  */
1217 
1218  /**
1219  * Frame counter, set by libavcodec.
1220  *
1221  * - decoding: total number of frames returned from the decoder so far.
1222  * - encoding: total number of frames passed to the encoder so far.
1223  *
1224  * @note the counter is not incremented if encoding/decoding resulted in
1225  * an error.
1226  */
1228 
1229  /**
1230  * number of bytes per packet if constant and known or 0
1231  * Used by some WAV based audio codecs.
1232  */
1234 
1235  /**
1236  * Audio cutoff bandwidth (0 means "automatic")
1237  * - encoding: Set by user.
1238  * - decoding: unused
1239  */
1240  int cutoff;
1241 
1242  /**
1243  * Audio channel layout.
1244  * - encoding: set by user.
1245  * - decoding: set by user, may be overwritten by libavcodec.
1246  */
1247  uint64_t channel_layout;
1248 
1249  /**
1250  * Request decoder to use this channel layout if it can (0 for default)
1251  * - encoding: unused
1252  * - decoding: Set by user.
1253  */
1255 
1256  /**
1257  * Type of service that the audio stream conveys.
1258  * - encoding: Set by user.
1259  * - decoding: Set by libavcodec.
1260  */
1262 
1263  /**
1264  * desired sample format
1265  * - encoding: Not used.
1266  * - decoding: Set by user.
1267  * Decoder will decode to this format if it can.
1268  */
1270 
1271  /**
1272  * This callback is called at the beginning of each frame to get data
1273  * buffer(s) for it. There may be one contiguous buffer for all the data or
1274  * there may be a buffer per each data plane or anything in between. What
1275  * this means is, you may set however many entries in buf[] you feel necessary.
1276  * Each buffer must be reference-counted using the AVBuffer API (see description
1277  * of buf[] below).
1278  *
1279  * The following fields will be set in the frame before this callback is
1280  * called:
1281  * - format
1282  * - width, height (video only)
1283  * - sample_rate, channel_layout, nb_samples (audio only)
1284  * Their values may differ from the corresponding values in
1285  * AVCodecContext. This callback must use the frame values, not the codec
1286  * context values, to calculate the required buffer size.
1287  *
1288  * This callback must fill the following fields in the frame:
1289  * - data[]
1290  * - linesize[]
1291  * - extended_data:
1292  * * if the data is planar audio with more than 8 channels, then this
1293  * callback must allocate and fill extended_data to contain all pointers
1294  * to all data planes. data[] must hold as many pointers as it can.
1295  * extended_data must be allocated with av_malloc() and will be freed in
1296  * av_frame_unref().
1297  * * otherwise extended_data must point to data
1298  * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
1299  * the frame's data and extended_data pointers must be contained in these. That
1300  * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
1301  * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
1302  * and av_buffer_ref().
1303  * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
1304  * this callback and filled with the extra buffers if there are more
1305  * buffers than buf[] can hold. extended_buf will be freed in
1306  * av_frame_unref().
1307  *
1308  * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
1309  * avcodec_default_get_buffer2() instead of providing buffers allocated by
1310  * some other means.
1311  *
1312  * Each data plane must be aligned to the maximum required by the target
1313  * CPU.
1314  *
1315  * @see avcodec_default_get_buffer2()
1316  *
1317  * Video:
1318  *
1319  * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
1320  * (read and/or written to if it is writable) later by libavcodec.
1321  *
1322  * avcodec_align_dimensions2() should be used to find the required width and
1323  * height, as they normally need to be rounded up to the next multiple of 16.
1324  *
1325  * Some decoders do not support linesizes changing between frames.
1326  *
1327  * If frame multithreading is used, this callback may be called from a
1328  * different thread, but not from more than one at once. Does not need to be
1329  * reentrant.
1330  *
1331  * @see avcodec_align_dimensions2()
1332  *
1333  * Audio:
1334  *
1335  * Decoders request a buffer of a particular size by setting
1336  * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
1337  * however, utilize only part of the buffer by setting AVFrame.nb_samples
1338  * to a smaller value in the output frame.
1339  *
1340  * As a convenience, av_samples_get_buffer_size() and
1341  * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
1342  * functions to find the required data size and to fill data pointers and
1343  * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1344  * since all planes must be the same size.
1345  *
1346  * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1347  *
1348  * - encoding: unused
1349  * - decoding: Set by libavcodec, user can override.
1350  */
1352 
1353 #if FF_API_OLD_ENCDEC
1354  /**
1355  * If non-zero, the decoded audio and video frames returned from
1356  * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
1357  * and are valid indefinitely. The caller must free them with
1358  * av_frame_unref() when they are not needed anymore.
1359  * Otherwise, the decoded frames must not be freed by the caller and are
1360  * only valid until the next decode call.
1361  *
1362  * This is always automatically enabled if avcodec_receive_frame() is used.
1363  *
1364  * - encoding: unused
1365  * - decoding: set by the caller before avcodec_open2().
1366  */
1369 #endif
1370 
1371  /* - encoding parameters */
1372  float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1373  float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1374 
1375  /**
1376  * minimum quantizer
1377  * - encoding: Set by user.
1378  * - decoding: unused
1379  */
1380  int qmin;
1381 
1382  /**
1383  * maximum quantizer
1384  * - encoding: Set by user.
1385  * - decoding: unused
1386  */
1387  int qmax;
1388 
1389  /**
1390  * maximum quantizer difference between frames
1391  * - encoding: Set by user.
1392  * - decoding: unused
1393  */
1395 
1396  /**
1397  * decoder bitstream buffer size
1398  * - encoding: Set by user.
1399  * - decoding: unused
1400  */
1402 
1403  /**
1404  * ratecontrol override, see RcOverride
1405  * - encoding: Allocated/set/freed by user.
1406  * - decoding: unused
1407  */
1410 
1411  /**
1412  * maximum bitrate
1413  * - encoding: Set by user.
1414  * - decoding: Set by user, may be overwritten by libavcodec.
1415  */
1416  int64_t rc_max_rate;
1417 
1418  /**
1419  * minimum bitrate
1420  * - encoding: Set by user.
1421  * - decoding: unused
1422  */
1423  int64_t rc_min_rate;
1424 
1425  /**
1426  * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
1427  * - encoding: Set by user.
1428  * - decoding: unused.
1429  */
1431 
1432  /**
1433  * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
1434  * - encoding: Set by user.
1435  * - decoding: unused.
1436  */
1438 
1439  /**
1440  * Number of bits which should be loaded into the rc buffer before decoding starts.
1441  * - encoding: Set by user.
1442  * - decoding: unused
1443  */
1445 
1446 #if FF_API_CODER_TYPE
1447 #define FF_CODER_TYPE_VLC 0
1448 #define FF_CODER_TYPE_AC 1
1449 #define FF_CODER_TYPE_RAW 2
1450 #define FF_CODER_TYPE_RLE 3
1451  /**
1452  * @deprecated use encoder private options instead
1453  */
1456 #endif /* FF_API_CODER_TYPE */
1457 
1458 #if FF_API_PRIVATE_OPT
1459  /** @deprecated use encoder private options instead */
1462 #endif
1463 
1464 #if FF_API_PRIVATE_OPT
1465  /** @deprecated use encoder private options instead */
1468 
1469  /** @deprecated use encoder private options instead */
1472 
1473  /** @deprecated use encoder private options instead */
1476 
1477  /** @deprecated use encoder private options instead */
1480 #endif /* FF_API_PRIVATE_OPT */
1481 
1482  /**
1483  * trellis RD quantization
1484  * - encoding: Set by user.
1485  * - decoding: unused
1486  */
1487  int trellis;
1488 
1489 #if FF_API_PRIVATE_OPT
1490  /** @deprecated use encoder private options instead */
1493 
1494  /** @deprecated use encoder private options instead */
1497 
1498  /** @deprecated use encoder private options instead */
1501 #endif
1502 
1503 #if FF_API_RTP_CALLBACK
1504  /**
1505  * @deprecated unused
1506  */
1507  /* The RTP callback: This function is called */
1508  /* every time the encoder has a packet to send. */
1509  /* It depends on the encoder if the data starts */
1510  /* with a Start Code (it should). H.263 does. */
1511  /* mb_nb contains the number of macroblocks */
1512  /* encoded in the RTP payload. */
1514  void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1515 #endif
1516 
1517 #if FF_API_PRIVATE_OPT
1518  /** @deprecated use encoder private options instead */
1520  int rtp_payload_size; /* The size of the RTP payload: the coder will */
1521  /* do its best to deliver a chunk with size */
1522  /* below rtp_payload_size, the chunk will start */
1523  /* with a start code on some codecs like H.263. */
1524  /* This doesn't take account of any particular */
1525  /* headers inside the transmitted RTP payload. */
1526 #endif
1527 
1528 #if FF_API_STAT_BITS
1529  /* statistics, used for 2-pass encoding */
1531  int mv_bits;
1539  int i_count;
1541  int p_count;
1546 
1547  /** @deprecated this field is unused */
1550 #endif
1551 
1552  /**
1553  * pass1 encoding statistics output buffer
1554  * - encoding: Set by libavcodec.
1555  * - decoding: unused
1556  */
1557  char *stats_out;
1558 
1559  /**
1560  * pass2 encoding statistics input buffer
1561  * Concatenated stuff from stats_out of pass1 should be placed here.
1562  * - encoding: Allocated/set/freed by user.
1563  * - decoding: unused
1564  */
1565  char *stats_in;
1566 
1567  /**
1568  * Work around bugs in encoders which sometimes cannot be detected automatically.
1569  * - encoding: Set by user
1570  * - decoding: Set by user
1571  */
1573 #define FF_BUG_AUTODETECT 1 ///< autodetection
1574 #define FF_BUG_XVID_ILACE 4
1575 #define FF_BUG_UMP4 8
1576 #define FF_BUG_NO_PADDING 16
1577 #define FF_BUG_AMV 32
1578 #define FF_BUG_QPEL_CHROMA 64
1579 #define FF_BUG_STD_QPEL 128
1580 #define FF_BUG_QPEL_CHROMA2 256
1581 #define FF_BUG_DIRECT_BLOCKSIZE 512
1582 #define FF_BUG_EDGE 1024
1583 #define FF_BUG_HPEL_CHROMA 2048
1584 #define FF_BUG_DC_CLIP 4096
1585 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1586 #define FF_BUG_TRUNCATED 16384
1587 #define FF_BUG_IEDGE 32768
1588 
1589  /**
1590  * strictly follow the standard (MPEG-4, ...).
1591  * - encoding: Set by user.
1592  * - decoding: Set by user.
1593  * Setting this to STRICT or higher means the encoder and decoder will
1594  * generally do stupid things, whereas setting it to unofficial or lower
1595  * will mean the encoder might produce output that is not supported by all
1596  * spec-compliant decoders. Decoders don't differentiate between normal,
1597  * unofficial and experimental (that is, they always try to decode things
1598  * when they can) unless they are explicitly asked to behave stupidly
1599  * (=strictly conform to the specs)
1600  */
1602 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1603 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1604 #define FF_COMPLIANCE_NORMAL 0
1605 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1606 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1607 
1608  /**
1609  * error concealment flags
1610  * - encoding: unused
1611  * - decoding: Set by user.
1612  */
1614 #define FF_EC_GUESS_MVS 1
1615 #define FF_EC_DEBLOCK 2
1616 #define FF_EC_FAVOR_INTER 256
1617 
1618  /**
1619  * debug
1620  * - encoding: Set by user.
1621  * - decoding: Set by user.
1622  */
1623  int debug;
1624 #define FF_DEBUG_PICT_INFO 1
1625 #define FF_DEBUG_RC 2
1626 #define FF_DEBUG_BITSTREAM 4
1627 #define FF_DEBUG_MB_TYPE 8
1628 #define FF_DEBUG_QP 16
1629 #define FF_DEBUG_DCT_COEFF 0x00000040
1630 #define FF_DEBUG_SKIP 0x00000080
1631 #define FF_DEBUG_STARTCODE 0x00000100
1632 #define FF_DEBUG_ER 0x00000400
1633 #define FF_DEBUG_MMCO 0x00000800
1634 #define FF_DEBUG_BUGS 0x00001000
1635 #define FF_DEBUG_BUFFERS 0x00008000
1636 #define FF_DEBUG_THREADS 0x00010000
1637 #define FF_DEBUG_GREEN_MD 0x00800000
1638 #define FF_DEBUG_NOMC 0x01000000
1639 
1640  /**
1641  * Error recognition; may misdetect some more or less valid parts as errors.
1642  * - encoding: Set by user.
1643  * - decoding: Set by user.
1644  */
1646 
1647 /**
1648  * Verify checksums embedded in the bitstream (could be of either encoded or
1649  * decoded data, depending on the codec) and print an error message on mismatch.
1650  * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
1651  * decoder returning an error.
1652  */
1653 #define AV_EF_CRCCHECK (1<<0)
1654 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
1655 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
1656 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
1657 
1658 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
1659 #define AV_EF_CAREFUL (1<<16) ///< consider things that violate the spec, are fast to calculate and have not been seen in the wild as errors
1660 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
1661 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
1662 
1663 
1664  /**
1665  * opaque 64-bit number (generally a PTS) that will be reordered and
1666  * output in AVFrame.reordered_opaque
1667  * - encoding: Set by libavcodec to the reordered_opaque of the input
1668  * frame corresponding to the last returned packet. Only
1669  * supported by encoders with the
1670  * AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE capability.
1671  * - decoding: Set by user.
1672  */
1674 
1675  /**
1676  * Hardware accelerator in use
1677  * - encoding: unused.
1678  * - decoding: Set by libavcodec
1679  */
1680  const struct AVHWAccel *hwaccel;
1681 
1682  /**
1683  * Hardware accelerator context.
1684  * For some hardware accelerators, a global context needs to be
1685  * provided by the user. In that case, this holds display-dependent
1686  * data FFmpeg cannot instantiate itself. Please refer to the
1687  * FFmpeg HW accelerator documentation to know how to fill this
1688  * is. e.g. for VA API, this is a struct vaapi_context.
1689  * - encoding: unused
1690  * - decoding: Set by user
1691  */
1693 
1694  /**
1695  * error
1696  * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
1697  * - decoding: unused
1698  */
1700 
1701  /**
1702  * DCT algorithm, see FF_DCT_* below
1703  * - encoding: Set by user.
1704  * - decoding: unused
1705  */
1707 #define FF_DCT_AUTO 0
1708 #define FF_DCT_FASTINT 1
1709 #define FF_DCT_INT 2
1710 #define FF_DCT_MMX 3
1711 #define FF_DCT_ALTIVEC 5
1712 #define FF_DCT_FAAN 6
1713 
1714  /**
1715  * IDCT algorithm, see FF_IDCT_* below.
1716  * - encoding: Set by user.
1717  * - decoding: Set by user.
1718  */
1720 #define FF_IDCT_AUTO 0
1721 #define FF_IDCT_INT 1
1722 #define FF_IDCT_SIMPLE 2
1723 #define FF_IDCT_SIMPLEMMX 3
1724 #define FF_IDCT_ARM 7
1725 #define FF_IDCT_ALTIVEC 8
1726 #define FF_IDCT_SIMPLEARM 10
1727 #define FF_IDCT_XVID 14
1728 #define FF_IDCT_SIMPLEARMV5TE 16
1729 #define FF_IDCT_SIMPLEARMV6 17
1730 #define FF_IDCT_FAAN 20
1731 #define FF_IDCT_SIMPLENEON 22
1732 #define FF_IDCT_NONE 24 /* Used by XvMC to extract IDCT coefficients with FF_IDCT_PERM_NONE */
1733 #define FF_IDCT_SIMPLEAUTO 128
1734 
1735  /**
1736  * bits per sample/pixel from the demuxer (needed for huffyuv).
1737  * - encoding: Set by libavcodec.
1738  * - decoding: Set by user.
1739  */
1741 
1742  /**
1743  * Bits per sample/pixel of internal libavcodec pixel/sample format.
1744  * - encoding: set by user.
1745  * - decoding: set by libavcodec.
1746  */
1748 
1749  /**
1750  * low resolution decoding, 1-> 1/2 size, 2->1/4 size
1751  * - encoding: unused
1752  * - decoding: Set by user.
1753  */
1754  int lowres;
1755 
1756 #if FF_API_CODED_FRAME
1757  /**
1758  * the picture in the bitstream
1759  * - encoding: Set by libavcodec.
1760  * - decoding: unused
1761  *
1762  * @deprecated use the quality factor packet side data instead
1763  */
1765 #endif
1766 
1767  /**
1768  * thread count
1769  * is used to decide how many independent tasks should be passed to execute()
1770  * - encoding: Set by user.
1771  * - decoding: Set by user.
1772  */
1774 
1775  /**
1776  * Which multithreading methods to use.
1777  * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
1778  * so clients which cannot provide future frames should not use it.
1779  *
1780  * - encoding: Set by user, otherwise the default is used.
1781  * - decoding: Set by user, otherwise the default is used.
1782  */
1784 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
1785 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
1786 
1787  /**
1788  * Which multithreading methods are in use by the codec.
1789  * - encoding: Set by libavcodec.
1790  * - decoding: Set by libavcodec.
1791  */
1793 
1794 #if FF_API_THREAD_SAFE_CALLBACKS
1795  /**
1796  * Set by the client if its custom get_buffer() callback can be called
1797  * synchronously from another thread, which allows faster multithreaded decoding.
1798  * draw_horiz_band() will be called from other threads regardless of this setting.
1799  * Ignored if the default get_buffer() is used.
1800  * - encoding: Set by user.
1801  * - decoding: Set by user.
1802  *
1803  * @deprecated the custom get_buffer2() callback should always be
1804  * thread-safe. Thread-unsafe get_buffer2() implementations will be
1805  * invalid starting with LIBAVCODEC_VERSION_MAJOR=60; in other words,
1806  * libavcodec will behave as if this field was always set to 1.
1807  * Callers that want to be forward compatible with future libavcodec
1808  * versions should wrap access to this field in
1809  * #if LIBAVCODEC_VERSION_MAJOR < 60
1810  */
1813 #endif
1814 
1815  /**
1816  * The codec may call this to execute several independent things.
1817  * It will return only after finishing all tasks.
1818  * The user may replace this with some multithreaded implementation,
1819  * the default implementation will execute the parts serially.
1820  * @param count the number of things to execute
1821  * - encoding: Set by libavcodec, user can override.
1822  * - decoding: Set by libavcodec, user can override.
1823  */
1824  int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
1825 
1826  /**
1827  * The codec may call this to execute several independent things.
1828  * It will return only after finishing all tasks.
1829  * The user may replace this with some multithreaded implementation,
1830  * the default implementation will execute the parts serially.
1831  * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
1832  * @param c context passed also to func
1833  * @param count the number of things to execute
1834  * @param arg2 argument passed unchanged to func
1835  * @param ret return values of executed functions, must have space for "count" values. May be NULL.
1836  * @param func function that will be called count times, with jobnr from 0 to count-1.
1837  * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
1838  * two instances of func executing at the same time will have the same threadnr.
1839  * @return always 0 currently, but code should handle a future improvement where when any call to func
1840  * returns < 0 no further calls to func may be done and < 0 is returned.
1841  * - encoding: Set by libavcodec, user can override.
1842  * - decoding: Set by libavcodec, user can override.
1843  */
1844  int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
1845 
1846  /**
1847  * noise vs. sse weight for the nsse comparison function
1848  * - encoding: Set by user.
1849  * - decoding: unused
1850  */
1852 
1853  /**
1854  * profile
1855  * - encoding: Set by user.
1856  * - decoding: Set by libavcodec.
1857  */
1858  int profile;
1859 #define FF_PROFILE_UNKNOWN -99
1860 #define FF_PROFILE_RESERVED -100
1861 
1862 #define FF_PROFILE_AAC_MAIN 0
1863 #define FF_PROFILE_AAC_LOW 1
1864 #define FF_PROFILE_AAC_SSR 2
1865 #define FF_PROFILE_AAC_LTP 3
1866 #define FF_PROFILE_AAC_HE 4
1867 #define FF_PROFILE_AAC_HE_V2 28
1868 #define FF_PROFILE_AAC_LD 22
1869 #define FF_PROFILE_AAC_ELD 38
1870 #define FF_PROFILE_MPEG2_AAC_LOW 128
1871 #define FF_PROFILE_MPEG2_AAC_HE 131
1872 
1873 #define FF_PROFILE_DNXHD 0
1874 #define FF_PROFILE_DNXHR_LB 1
1875 #define FF_PROFILE_DNXHR_SQ 2
1876 #define FF_PROFILE_DNXHR_HQ 3
1877 #define FF_PROFILE_DNXHR_HQX 4
1878 #define FF_PROFILE_DNXHR_444 5
1879 
1880 #define FF_PROFILE_DTS 20
1881 #define FF_PROFILE_DTS_ES 30
1882 #define FF_PROFILE_DTS_96_24 40
1883 #define FF_PROFILE_DTS_HD_HRA 50
1884 #define FF_PROFILE_DTS_HD_MA 60
1885 #define FF_PROFILE_DTS_EXPRESS 70
1886 
1887 #define FF_PROFILE_MPEG2_422 0
1888 #define FF_PROFILE_MPEG2_HIGH 1
1889 #define FF_PROFILE_MPEG2_SS 2
1890 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
1891 #define FF_PROFILE_MPEG2_MAIN 4
1892 #define FF_PROFILE_MPEG2_SIMPLE 5
1893 
1894 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
1895 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
1896 
1897 #define FF_PROFILE_H264_BASELINE 66
1898 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
1899 #define FF_PROFILE_H264_MAIN 77
1900 #define FF_PROFILE_H264_EXTENDED 88
1901 #define FF_PROFILE_H264_HIGH 100
1902 #define FF_PROFILE_H264_HIGH_10 110
1903 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
1904 #define FF_PROFILE_H264_MULTIVIEW_HIGH 118
1905 #define FF_PROFILE_H264_HIGH_422 122
1906 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
1907 #define FF_PROFILE_H264_STEREO_HIGH 128
1908 #define FF_PROFILE_H264_HIGH_444 144
1909 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
1910 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
1911 #define FF_PROFILE_H264_CAVLC_444 44
1912 
1913 #define FF_PROFILE_VC1_SIMPLE 0
1914 #define FF_PROFILE_VC1_MAIN 1
1915 #define FF_PROFILE_VC1_COMPLEX 2
1916 #define FF_PROFILE_VC1_ADVANCED 3
1917 
1918 #define FF_PROFILE_MPEG4_SIMPLE 0
1919 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
1920 #define FF_PROFILE_MPEG4_CORE 2
1921 #define FF_PROFILE_MPEG4_MAIN 3
1922 #define FF_PROFILE_MPEG4_N_BIT 4
1923 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
1924 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
1925 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
1926 #define FF_PROFILE_MPEG4_HYBRID 8
1927 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
1928 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
1929 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
1930 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
1931 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
1932 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
1933 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
1934 
1935 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 1
1936 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 2
1937 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 32768
1938 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
1939 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
1940 
1941 #define FF_PROFILE_VP9_0 0
1942 #define FF_PROFILE_VP9_1 1
1943 #define FF_PROFILE_VP9_2 2
1944 #define FF_PROFILE_VP9_3 3
1945 
1946 #define FF_PROFILE_HEVC_MAIN 1
1947 #define FF_PROFILE_HEVC_MAIN_10 2
1948 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
1949 #define FF_PROFILE_HEVC_REXT 4
1950 
1951 #define FF_PROFILE_VVC_MAIN_10 1
1952 #define FF_PROFILE_VVC_MAIN_10_444 33
1953 
1954 #define FF_PROFILE_AV1_MAIN 0
1955 #define FF_PROFILE_AV1_HIGH 1
1956 #define FF_PROFILE_AV1_PROFESSIONAL 2
1957 
1958 #define FF_PROFILE_MJPEG_HUFFMAN_BASELINE_DCT 0xc0
1959 #define FF_PROFILE_MJPEG_HUFFMAN_EXTENDED_SEQUENTIAL_DCT 0xc1
1960 #define FF_PROFILE_MJPEG_HUFFMAN_PROGRESSIVE_DCT 0xc2
1961 #define FF_PROFILE_MJPEG_HUFFMAN_LOSSLESS 0xc3
1962 #define FF_PROFILE_MJPEG_JPEG_LS 0xf7
1963 
1964 #define FF_PROFILE_SBC_MSBC 1
1965 
1966 #define FF_PROFILE_PRORES_PROXY 0
1967 #define FF_PROFILE_PRORES_LT 1
1968 #define FF_PROFILE_PRORES_STANDARD 2
1969 #define FF_PROFILE_PRORES_HQ 3
1970 #define FF_PROFILE_PRORES_4444 4
1971 #define FF_PROFILE_PRORES_XQ 5
1972 
1973 #define FF_PROFILE_ARIB_PROFILE_A 0
1974 #define FF_PROFILE_ARIB_PROFILE_C 1
1975 
1976 #define FF_PROFILE_KLVA_SYNC 0
1977 #define FF_PROFILE_KLVA_ASYNC 1
1978 
1979  /**
1980  * level
1981  * - encoding: Set by user.
1982  * - decoding: Set by libavcodec.
1983  */
1984  int level;
1985 #define FF_LEVEL_UNKNOWN -99
1986 
1987  /**
1988  * Skip loop filtering for selected frames.
1989  * - encoding: unused
1990  * - decoding: Set by user.
1991  */
1993 
1994  /**
1995  * Skip IDCT/dequantization for selected frames.
1996  * - encoding: unused
1997  * - decoding: Set by user.
1998  */
1999  enum AVDiscard skip_idct;
2000 
2001  /**
2002  * Skip decoding for selected frames.
2003  * - encoding: unused
2004  * - decoding: Set by user.
2005  */
2006  enum AVDiscard skip_frame;
2007 
2008  /**
2009  * Header containing style information for text subtitles.
2010  * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2011  * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2012  * the Format line following. It shouldn't include any Dialogue line.
2013  * - encoding: Set/allocated/freed by user (before avcodec_open2())
2014  * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2015  */
2018 
2019 #if FF_API_VBV_DELAY
2020  /**
2021  * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2022  * Used for compliant TS muxing.
2023  * - encoding: Set by libavcodec.
2024  * - decoding: unused.
2025  * @deprecated this value is now exported as a part of
2026  * AV_PKT_DATA_CPB_PROPERTIES packet side data
2027  */
2029  uint64_t vbv_delay;
2030 #endif
2031 
2032 #if FF_API_SIDEDATA_ONLY_PKT
2033  /**
2034  * Encoding only and set by default. Allow encoders to output packets
2035  * that do not contain any encoded data, only side data.
2036  *
2037  * Some encoders need to output such packets, e.g. to update some stream
2038  * parameters at the end of encoding.
2039  *
2040  * @deprecated this field disables the default behaviour and
2041  * it is kept only for compatibility.
2042  */
2045 #endif
2046 
2047  /**
2048  * Audio only. The number of "priming" samples (padding) inserted by the
2049  * encoder at the beginning of the audio. I.e. this number of leading
2050  * decoded samples must be discarded by the caller to get the original audio
2051  * without leading padding.
2052  *
2053  * - decoding: unused
2054  * - encoding: Set by libavcodec. The timestamps on the output packets are
2055  * adjusted by the encoder so that they always refer to the
2056  * first sample of the data actually contained in the packet,
2057  * including any added padding. E.g. if the timebase is
2058  * 1/samplerate and the timestamp of the first input sample is
2059  * 0, the timestamp of the first output packet will be
2060  * -initial_padding.
2061  */
2063 
2064  /**
2065  * - decoding: For codecs that store a framerate value in the compressed
2066  * bitstream, the decoder may export it here. { 0, 1} when
2067  * unknown.
2068  * - encoding: May be used to signal the framerate of CFR content to an
2069  * encoder.
2070  */
2072 
2073  /**
2074  * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
2075  * - encoding: unused.
2076  * - decoding: Set by libavcodec before calling get_format()
2077  */
2079 
2080  /**
2081  * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
2082  * - encoding unused.
2083  * - decoding set by user.
2084  */
2086 
2087  /**
2088  * AVCodecDescriptor
2089  * - encoding: unused.
2090  * - decoding: set by libavcodec.
2091  */
2093 
2094  /**
2095  * Current statistics for PTS correction.
2096  * - decoding: maintained and used by libavcodec, not intended to be used by user apps
2097  * - encoding: unused
2098  */
2099  int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
2100  int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
2101  int64_t pts_correction_last_pts; /// PTS of the last frame
2102  int64_t pts_correction_last_dts; /// DTS of the last frame
2103 
2104  /**
2105  * Character encoding of the input subtitles file.
2106  * - decoding: set by user
2107  * - encoding: unused
2108  */
2110 
2111  /**
2112  * Subtitles character encoding mode. Formats or codecs might be adjusting
2113  * this setting (if they are doing the conversion themselves for instance).
2114  * - decoding: set by libavcodec
2115  * - encoding: unused
2116  */
2118 #define FF_SUB_CHARENC_MODE_DO_NOTHING -1 ///< do nothing (demuxer outputs a stream supposed to be already in UTF-8, or the codec is bitmap for instance)
2119 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
2120 #define FF_SUB_CHARENC_MODE_PRE_DECODER 1 ///< the AVPacket data needs to be recoded to UTF-8 before being fed to the decoder, requires iconv
2121 #define FF_SUB_CHARENC_MODE_IGNORE 2 ///< neither convert the subtitles, nor check them for valid UTF-8
2122 
2123  /**
2124  * Skip processing alpha if supported by codec.
2125  * Note that if the format uses pre-multiplied alpha (common with VP6,
2126  * and recommended due to better video quality/compression)
2127  * the image will look as if alpha-blended onto a black background.
2128  * However for formats that do not use pre-multiplied alpha
2129  * there might be serious artefacts (though e.g. libswscale currently
2130  * assumes pre-multiplied alpha anyway).
2131  *
2132  * - decoding: set by user
2133  * - encoding: unused
2134  */
2136 
2137  /**
2138  * Number of samples to skip after a discontinuity
2139  * - decoding: unused
2140  * - encoding: set by libavcodec
2141  */
2143 
2144 #if FF_API_DEBUG_MV
2145  /**
2146  * @deprecated unused
2147  */
2150 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2151 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2152 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2153 #endif
2154 
2155  /**
2156  * custom intra quantization matrix
2157  * - encoding: Set by user, can be NULL.
2158  * - decoding: unused.
2159  */
2161 
2162  /**
2163  * dump format separator.
2164  * can be ", " or "\n " or anything else
2165  * - encoding: Set by user.
2166  * - decoding: Set by user.
2167  */
2169 
2170  /**
2171  * ',' separated list of allowed decoders.
2172  * If NULL then all are allowed
2173  * - encoding: unused
2174  * - decoding: set by user
2175  */
2177 
2178  /**
2179  * Properties of the stream that gets decoded
2180  * - encoding: unused
2181  * - decoding: set by libavcodec
2182  */
2183  unsigned properties;
2184 #define FF_CODEC_PROPERTY_LOSSLESS 0x00000001
2185 #define FF_CODEC_PROPERTY_CLOSED_CAPTIONS 0x00000002
2186 
2187  /**
2188  * Additional data associated with the entire coded stream.
2189  *
2190  * - decoding: unused
2191  * - encoding: may be set by libavcodec after avcodec_open2().
2192  */
2195 
2196  /**
2197  * A reference to the AVHWFramesContext describing the input (for encoding)
2198  * or output (decoding) frames. The reference is set by the caller and
2199  * afterwards owned (and freed) by libavcodec - it should never be read by
2200  * the caller after being set.
2201  *
2202  * - decoding: This field should be set by the caller from the get_format()
2203  * callback. The previous reference (if any) will always be
2204  * unreffed by libavcodec before the get_format() call.
2205  *
2206  * If the default get_buffer2() is used with a hwaccel pixel
2207  * format, then this AVHWFramesContext will be used for
2208  * allocating the frame buffers.
2209  *
2210  * - encoding: For hardware encoders configured to use a hwaccel pixel
2211  * format, this field should be set by the caller to a reference
2212  * to the AVHWFramesContext describing input frames.
2213  * AVHWFramesContext.format must be equal to
2214  * AVCodecContext.pix_fmt.
2215  *
2216  * This field should be set before avcodec_open2() is called.
2217  */
2219 
2220  /**
2221  * Control the form of AVSubtitle.rects[N]->ass
2222  * - decoding: set by user
2223  * - encoding: unused
2224  */
2226 #define FF_SUB_TEXT_FMT_ASS 0
2227 #if FF_API_ASS_TIMING
2228 #define FF_SUB_TEXT_FMT_ASS_WITH_TIMINGS 1
2229 #endif
2230 
2231  /**
2232  * Audio only. The amount of padding (in samples) appended by the encoder to
2233  * the end of the audio. I.e. this number of decoded samples must be
2234  * discarded by the caller from the end of the stream to get the original
2235  * audio without any trailing padding.
2236  *
2237  * - decoding: unused
2238  * - encoding: unused
2239  */
2241 
2242  /**
2243  * The number of pixels per image to maximally accept.
2244  *
2245  * - decoding: set by user
2246  * - encoding: set by user
2247  */
2248  int64_t max_pixels;
2249 
2250  /**
2251  * A reference to the AVHWDeviceContext describing the device which will
2252  * be used by a hardware encoder/decoder. The reference is set by the
2253  * caller and afterwards owned (and freed) by libavcodec.
2254  *
2255  * This should be used if either the codec device does not require
2256  * hardware frames or any that are used are to be allocated internally by
2257  * libavcodec. If the user wishes to supply any of the frames used as
2258  * encoder input or decoder output then hw_frames_ctx should be used
2259  * instead. When hw_frames_ctx is set in get_format() for a decoder, this
2260  * field will be ignored while decoding the associated stream segment, but
2261  * may again be used on a following one after another get_format() call.
2262  *
2263  * For both encoders and decoders this field should be set before
2264  * avcodec_open2() is called and must not be written to thereafter.
2265  *
2266  * Note that some decoders may require this field to be set initially in
2267  * order to support hw_frames_ctx at all - in that case, all frames
2268  * contexts used must be created on the same device.
2269  */
2271 
2272  /**
2273  * Bit set of AV_HWACCEL_FLAG_* flags, which affect hardware accelerated
2274  * decoding (if active).
2275  * - encoding: unused
2276  * - decoding: Set by user (either before avcodec_open2(), or in the
2277  * AVCodecContext.get_format callback)
2278  */
2280 
2281  /**
2282  * Video decoding only. Certain video codecs support cropping, meaning that
2283  * only a sub-rectangle of the decoded frame is intended for display. This
2284  * option controls how cropping is handled by libavcodec.
2285  *
2286  * When set to 1 (the default), libavcodec will apply cropping internally.
2287  * I.e. it will modify the output frame width/height fields and offset the
2288  * data pointers (only by as much as possible while preserving alignment, or
2289  * by the full amount if the AV_CODEC_FLAG_UNALIGNED flag is set) so that
2290  * the frames output by the decoder refer only to the cropped area. The
2291  * crop_* fields of the output frames will be zero.
2292  *
2293  * When set to 0, the width/height fields of the output frames will be set
2294  * to the coded dimensions and the crop_* fields will describe the cropping
2295  * rectangle. Applying the cropping is left to the caller.
2296  *
2297  * @warning When hardware acceleration with opaque output frames is used,
2298  * libavcodec is unable to apply cropping from the top/left border.
2299  *
2300  * @note when this option is set to zero, the width/height fields of the
2301  * AVCodecContext and output AVFrames have different meanings. The codec
2302  * context fields store display dimensions (with the coded dimensions in
2303  * coded_width/height), while the frame fields store the coded dimensions
2304  * (with the display dimensions being determined by the crop_* fields).
2305  */
2307 
2308  /*
2309  * Video decoding only. Sets the number of extra hardware frames which
2310  * the decoder will allocate for use by the caller. This must be set
2311  * before avcodec_open2() is called.
2312  *
2313  * Some hardware decoders require all frames that they will use for
2314  * output to be defined in advance before decoding starts. For such
2315  * decoders, the hardware frame pool must therefore be of a fixed size.
2316  * The extra frames set here are on top of any number that the decoder
2317  * needs internally in order to operate normally (for example, frames
2318  * used as reference pictures).
2319  */
2321 
2322  /**
2323  * The percentage of damaged samples to discard a frame.
2324  *
2325  * - decoding: set by user
2326  * - encoding: unused
2327  */
2329 
2330  /**
2331  * The number of samples per frame to maximally accept.
2332  *
2333  * - decoding: set by user
2334  * - encoding: set by user
2335  */
2336  int64_t max_samples;
2337 
2338  /**
2339  * Bit set of AV_CODEC_EXPORT_DATA_* flags, which affects the kind of
2340  * metadata exported in frame, packet, or coded stream side data by
2341  * decoders and encoders.
2342  *
2343  * - decoding: set by user
2344  * - encoding: set by user
2345  */
2347 
2348  /**
2349  * This callback is called at the beginning of each packet to get a data
2350  * buffer for it.
2351  *
2352  * The following field will be set in the packet before this callback is
2353  * called:
2354  * - size
2355  * This callback must use the above value to calculate the required buffer size,
2356  * which must padded by at least AV_INPUT_BUFFER_PADDING_SIZE bytes.
2357  *
2358  * This callback must fill the following fields in the packet:
2359  * - data: alignment requirements for AVPacket apply, if any. Some architectures and
2360  * encoders may benefit from having aligned data.
2361  * - buf: must contain a pointer to an AVBufferRef structure. The packet's
2362  * data pointer must be contained in it. See: av_buffer_create(), av_buffer_alloc(),
2363  * and av_buffer_ref().
2364  *
2365  * If AV_CODEC_CAP_DR1 is not set then get_encode_buffer() must call
2366  * avcodec_default_get_encode_buffer() instead of providing a buffer allocated by
2367  * some other means.
2368  *
2369  * The flags field may contain a combination of AV_GET_ENCODE_BUFFER_FLAG_ flags.
2370  * They may be used for example to hint what use the buffer may get after being
2371  * created.
2372  * Implementations of this callback may ignore flags they don't understand.
2373  * If AV_GET_ENCODE_BUFFER_FLAG_REF is set in flags then the packet may be reused
2374  * (read and/or written to if it is writable) later by libavcodec.
2375  *
2376  * This callback must be thread-safe, as when frame threading is used, it may
2377  * be called from multiple threads simultaneously.
2378  *
2379  * @see avcodec_default_get_encode_buffer()
2380  *
2381  * - encoding: Set by libavcodec, user can override.
2382  * - decoding: unused
2383  */
2385 } AVCodecContext;
2386 
2387 #if FF_API_CODEC_GET_SET
2388 /**
2389  * Accessors for some AVCodecContext fields. These used to be provided for ABI
2390  * compatibility, and do not need to be used anymore.
2391  */
2396 
2401 
2403 unsigned av_codec_get_codec_properties(const AVCodecContext *avctx);
2404 
2409 
2414 
2419 #endif
2420 
2421 struct AVSubtitle;
2422 
2423 #if FF_API_CODEC_GET_SET
2425 int av_codec_get_max_lowres(const AVCodec *codec);
2426 #endif
2427 
2428 struct MpegEncContext;
2429 
2430 /**
2431  * @defgroup lavc_hwaccel AVHWAccel
2432  *
2433  * @note Nothing in this structure should be accessed by the user. At some
2434  * point in future it will not be externally visible at all.
2435  *
2436  * @{
2437  */
2438 typedef struct AVHWAccel {
2439  /**
2440  * Name of the hardware accelerated codec.
2441  * The name is globally unique among encoders and among decoders (but an
2442  * encoder and a decoder can share the same name).
2443  */
2444  const char *name;
2445 
2446  /**
2447  * Type of codec implemented by the hardware accelerator.
2448  *
2449  * See AVMEDIA_TYPE_xxx
2450  */
2451  enum AVMediaType type;
2452 
2453  /**
2454  * Codec implemented by the hardware accelerator.
2455  *
2456  * See AV_CODEC_ID_xxx
2457  */
2458  enum AVCodecID id;
2459 
2460  /**
2461  * Supported pixel format.
2462  *
2463  * Only hardware accelerated formats are supported here.
2464  */
2465  enum AVPixelFormat pix_fmt;
2466 
2467  /**
2468  * Hardware accelerated codec capabilities.
2469  * see AV_HWACCEL_CODEC_CAP_*
2470  */
2472 
2473  /*****************************************************************
2474  * No fields below this line are part of the public API. They
2475  * may not be used outside of libavcodec and can be changed and
2476  * removed at will.
2477  * New public fields should be added right above.
2478  *****************************************************************
2479  */
2480 
2481  /**
2482  * Allocate a custom buffer
2483  */
2485 
2486  /**
2487  * Called at the beginning of each frame or field picture.
2488  *
2489  * Meaningful frame information (codec specific) is guaranteed to
2490  * be parsed at this point. This function is mandatory.
2491  *
2492  * Note that buf can be NULL along with buf_size set to 0.
2493  * Otherwise, this means the whole frame is available at this point.
2494  *
2495  * @param avctx the codec context
2496  * @param buf the frame data buffer base
2497  * @param buf_size the size of the frame in bytes
2498  * @return zero if successful, a negative value otherwise
2499  */
2500  int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2501 
2502  /**
2503  * Callback for parameter data (SPS/PPS/VPS etc).
2504  *
2505  * Useful for hardware decoders which keep persistent state about the
2506  * video parameters, and need to receive any changes to update that state.
2507  *
2508  * @param avctx the codec context
2509  * @param type the nal unit type
2510  * @param buf the nal unit data buffer
2511  * @param buf_size the size of the nal unit in bytes
2512  * @return zero if successful, a negative value otherwise
2513  */
2514  int (*decode_params)(AVCodecContext *avctx, int type, const uint8_t *buf, uint32_t buf_size);
2515 
2516  /**
2517  * Callback for each slice.
2518  *
2519  * Meaningful slice information (codec specific) is guaranteed to
2520  * be parsed at this point. This function is mandatory.
2521  * The only exception is XvMC, that works on MB level.
2522  *
2523  * @param avctx the codec context
2524  * @param buf the slice data buffer base
2525  * @param buf_size the size of the slice in bytes
2526  * @return zero if successful, a negative value otherwise
2527  */
2528  int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2529 
2530  /**
2531  * Called at the end of each frame or field picture.
2532  *
2533  * The whole picture is parsed at this point and can now be sent
2534  * to the hardware accelerator. This function is mandatory.
2535  *
2536  * @param avctx the codec context
2537  * @return zero if successful, a negative value otherwise
2538  */
2540 
2541  /**
2542  * Size of per-frame hardware accelerator private data.
2543  *
2544  * Private data is allocated with av_mallocz() before
2545  * AVCodecContext.get_buffer() and deallocated after
2546  * AVCodecContext.release_buffer().
2547  */
2549 
2550  /**
2551  * Called for every Macroblock in a slice.
2552  *
2553  * XvMC uses it to replace the ff_mpv_reconstruct_mb().
2554  * Instead of decoding to raw picture, MB parameters are
2555  * stored in an array provided by the video driver.
2556  *
2557  * @param s the mpeg context
2558  */
2560 
2561  /**
2562  * Initialize the hwaccel private data.
2563  *
2564  * This will be called from ff_get_format(), after hwaccel and
2565  * hwaccel_context are set and the hwaccel private data in AVCodecInternal
2566  * is allocated.
2567  */
2569 
2570  /**
2571  * Uninitialize the hwaccel private data.
2572  *
2573  * This will be called from get_format() or avcodec_close(), after hwaccel
2574  * and hwaccel_context are already uninitialized.
2575  */
2577 
2578  /**
2579  * Size of the private data to allocate in
2580  * AVCodecInternal.hwaccel_priv_data.
2581  */
2583 
2584  /**
2585  * Internal hwaccel capabilities.
2586  */
2588 
2589  /**
2590  * Fill the given hw_frames context with current codec parameters. Called
2591  * from get_format. Refer to avcodec_get_hw_frames_parameters() for
2592  * details.
2593  *
2594  * This CAN be called before AVHWAccel.init is called, and you must assume
2595  * that avctx->hwaccel_priv_data is invalid.
2596  */
2598 } AVHWAccel;
2599 
2600 /**
2601  * HWAccel is experimental and is thus avoided in favor of non experimental
2602  * codecs
2603  */
2604 #define AV_HWACCEL_CODEC_CAP_EXPERIMENTAL 0x0200
2605 
2606 /**
2607  * Hardware acceleration should be used for decoding even if the codec level
2608  * used is unknown or higher than the maximum supported level reported by the
2609  * hardware driver.
2610  *
2611  * It's generally a good idea to pass this flag unless you have a specific
2612  * reason not to, as hardware tends to under-report supported levels.
2613  */
2614 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
2615 
2616 /**
2617  * Hardware acceleration can output YUV pixel formats with a different chroma
2618  * sampling than 4:2:0 and/or other than 8 bits per component.
2619  */
2620 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
2621 
2622 /**
2623  * Hardware acceleration should still be attempted for decoding when the
2624  * codec profile does not match the reported capabilities of the hardware.
2625  *
2626  * For example, this can be used to try to decode baseline profile H.264
2627  * streams in hardware - it will often succeed, because many streams marked
2628  * as baseline profile actually conform to constrained baseline profile.
2629  *
2630  * @warning If the stream is actually not supported then the behaviour is
2631  * undefined, and may include returning entirely incorrect output
2632  * while indicating success.
2633  */
2634 #define AV_HWACCEL_FLAG_ALLOW_PROFILE_MISMATCH (1 << 2)
2635 
2636 /**
2637  * @}
2638  */
2639 
2640 #if FF_API_AVPICTURE
2641 /**
2642  * @defgroup lavc_picture AVPicture
2643  *
2644  * Functions for working with AVPicture
2645  * @{
2646  */
2647 
2648 /**
2649  * Picture data structure.
2650  *
2651  * Up to four components can be stored into it, the last component is
2652  * alpha.
2653  * @deprecated use AVFrame or imgutils functions instead
2654  */
2655 typedef struct AVPicture {
2657  uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
2659  int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
2660 } AVPicture;
2661 
2662 /**
2663  * @}
2664  */
2665 #endif
2666 
2669 
2670  SUBTITLE_BITMAP, ///< A bitmap, pict will be set
2671 
2672  /**
2673  * Plain text, the text field must be set by the decoder and is
2674  * authoritative. ass and pict fields may contain approximations.
2675  */
2677 
2678  /**
2679  * Formatted text, the ass field must be set by the decoder and is
2680  * authoritative. pict and text fields may contain approximations.
2681  */
2683 };
2684 
2685 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
2686 
2687 typedef struct AVSubtitleRect {
2688  int x; ///< top left corner of pict, undefined when pict is not set
2689  int y; ///< top left corner of pict, undefined when pict is not set
2690  int w; ///< width of pict, undefined when pict is not set
2691  int h; ///< height of pict, undefined when pict is not set
2692  int nb_colors; ///< number of colors in pict, undefined when pict is not set
2693 
2694 #if FF_API_AVPICTURE
2695  /**
2696  * @deprecated unused
2697  */
2700 #endif
2701  /**
2702  * data+linesize for the bitmap of this subtitle.
2703  * Can be set for text/ass as well once they are rendered.
2704  */
2706  int linesize[4];
2707 
2708  enum AVSubtitleType type;
2709 
2710  char *text; ///< 0 terminated plain UTF-8 text
2711 
2712  /**
2713  * 0 terminated ASS/SSA compatible event line.
2714  * The presentation of this is unaffected by the other values in this
2715  * struct.
2716  */
2717  char *ass;
2718 
2719  int flags;
2720 } AVSubtitleRect;
2721 
2722 typedef struct AVSubtitle {
2723  uint16_t format; /* 0 = graphics */
2724  uint32_t start_display_time; /* relative to packet pts, in ms */
2725  uint32_t end_display_time; /* relative to packet pts, in ms */
2726  unsigned num_rects;
2728  int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
2729 } AVSubtitle;
2730 
2731 #if FF_API_NEXT
2732 /**
2733  * If c is NULL, returns the first registered codec,
2734  * if c is non-NULL, returns the next registered codec after c,
2735  * or NULL if c is the last one.
2736  */
2738 AVCodec *av_codec_next(const AVCodec *c);
2739 #endif
2740 
2741 /**
2742  * Return the LIBAVCODEC_VERSION_INT constant.
2743  */
2744 unsigned avcodec_version(void);
2745 
2746 /**
2747  * Return the libavcodec build-time configuration.
2748  */
2749 const char *avcodec_configuration(void);
2750 
2751 /**
2752  * Return the libavcodec license.
2753  */
2754 const char *avcodec_license(void);
2755 
2756 #if FF_API_NEXT
2757 /**
2758  * @deprecated Calling this function is unnecessary.
2759  */
2761 void avcodec_register(AVCodec *codec);
2762 
2763 /**
2764  * @deprecated Calling this function is unnecessary.
2765  */
2767 void avcodec_register_all(void);
2768 #endif
2769 
2770 /**
2771  * Allocate an AVCodecContext and set its fields to default values. The
2772  * resulting struct should be freed with avcodec_free_context().
2773  *
2774  * @param codec if non-NULL, allocate private data and initialize defaults
2775  * for the given codec. It is illegal to then call avcodec_open2()
2776  * with a different codec.
2777  * If NULL, then the codec-specific defaults won't be initialized,
2778  * which may result in suboptimal default settings (this is
2779  * important mainly for encoders, e.g. libx264).
2780  *
2781  * @return An AVCodecContext filled with default values or NULL on failure.
2782  */
2784 
2785 /**
2786  * Free the codec context and everything associated with it and write NULL to
2787  * the provided pointer.
2788  */
2789 void avcodec_free_context(AVCodecContext **avctx);
2790 
2791 #if FF_API_GET_CONTEXT_DEFAULTS
2792 /**
2793  * @deprecated This function should not be used, as closing and opening a codec
2794  * context multiple time is not supported. A new codec context should be
2795  * allocated for each new use.
2796  */
2798 #endif
2799 
2800 /**
2801  * Get the AVClass for AVCodecContext. It can be used in combination with
2802  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
2803  *
2804  * @see av_opt_find().
2805  */
2806 const AVClass *avcodec_get_class(void);
2807 
2808 #if FF_API_GET_FRAME_CLASS
2809 /**
2810  * @deprecated This function should not be used.
2811  */
2813 const AVClass *avcodec_get_frame_class(void);
2814 #endif
2815 
2816 /**
2817  * Get the AVClass for AVSubtitleRect. It can be used in combination with
2818  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
2819  *
2820  * @see av_opt_find().
2821  */
2823 
2824 #if FF_API_COPY_CONTEXT
2825 /**
2826  * Copy the settings of the source AVCodecContext into the destination
2827  * AVCodecContext. The resulting destination codec context will be
2828  * unopened, i.e. you are required to call avcodec_open2() before you
2829  * can use this AVCodecContext to decode/encode video/audio data.
2830  *
2831  * @param dest target codec context, should be initialized with
2832  * avcodec_alloc_context3(NULL), but otherwise uninitialized
2833  * @param src source codec context
2834  * @return AVERROR() on error (e.g. memory allocation error), 0 on success
2835  *
2836  * @deprecated The semantics of this function are ill-defined and it should not
2837  * be used. If you need to transfer the stream parameters from one codec context
2838  * to another, use an intermediate AVCodecParameters instance and the
2839  * avcodec_parameters_from_context() / avcodec_parameters_to_context()
2840  * functions.
2841  */
2844 #endif
2845 
2846 /**
2847  * Fill the parameters struct based on the values from the supplied codec
2848  * context. Any allocated fields in par are freed and replaced with duplicates
2849  * of the corresponding fields in codec.
2850  *
2851  * @return >= 0 on success, a negative AVERROR code on failure
2852  */
2854  const AVCodecContext *codec);
2855 
2856 /**
2857  * Fill the codec context based on the values from the supplied codec
2858  * parameters. Any allocated fields in codec that have a corresponding field in
2859  * par are freed and replaced with duplicates of the corresponding field in par.
2860  * Fields in codec that do not have a counterpart in par are not touched.
2861  *
2862  * @return >= 0 on success, a negative AVERROR code on failure.
2863  */
2865  const AVCodecParameters *par);
2866 
2867 /**
2868  * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
2869  * function the context has to be allocated with avcodec_alloc_context3().
2870  *
2871  * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
2872  * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
2873  * retrieving a codec.
2874  *
2875  * @warning This function is not thread safe!
2876  *
2877  * @note Always call this function before using decoding routines (such as
2878  * @ref avcodec_receive_frame()).
2879  *
2880  * @code
2881  * av_dict_set(&opts, "b", "2.5M", 0);
2882  * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
2883  * if (!codec)
2884  * exit(1);
2885  *
2886  * context = avcodec_alloc_context3(codec);
2887  *
2888  * if (avcodec_open2(context, codec, opts) < 0)
2889  * exit(1);
2890  * @endcode
2891  *
2892  * @param avctx The context to initialize.
2893  * @param codec The codec to open this context for. If a non-NULL codec has been
2894  * previously passed to avcodec_alloc_context3() or
2895  * for this context, then this parameter MUST be either NULL or
2896  * equal to the previously passed codec.
2897  * @param options A dictionary filled with AVCodecContext and codec-private options.
2898  * On return this object will be filled with options that were not found.
2899  *
2900  * @return zero on success, a negative value on error
2901  * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
2902  * av_dict_set(), av_opt_find().
2903  */
2904 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
2905 
2906 /**
2907  * Close a given AVCodecContext and free all the data associated with it
2908  * (but not the AVCodecContext itself).
2909  *
2910  * Calling this function on an AVCodecContext that hasn't been opened will free
2911  * the codec-specific data allocated in avcodec_alloc_context3() with a non-NULL
2912  * codec. Subsequent calls will do nothing.
2913  *
2914  * @note Do not use this function. Use avcodec_free_context() to destroy a
2915  * codec context (either open or closed). Opening and closing a codec context
2916  * multiple times is not supported anymore -- use multiple codec contexts
2917  * instead.
2918  */
2919 int avcodec_close(AVCodecContext *avctx);
2920 
2921 /**
2922  * Free all allocated data in the given subtitle struct.
2923  *
2924  * @param sub AVSubtitle to free.
2925  */
2927 
2928 /**
2929  * @}
2930  */
2931 
2932 /**
2933  * @addtogroup lavc_decoding
2934  * @{
2935  */
2936 
2937 /**
2938  * The default callback for AVCodecContext.get_buffer2(). It is made public so
2939  * it can be called by custom get_buffer2() implementations for decoders without
2940  * AV_CODEC_CAP_DR1 set.
2941  */
2943 
2944 /**
2945  * The default callback for AVCodecContext.get_encode_buffer(). It is made public so
2946  * it can be called by custom get_encode_buffer() implementations for encoders without
2947  * AV_CODEC_CAP_DR1 set.
2948  */
2950 
2951 /**
2952  * Modify width and height values so that they will result in a memory
2953  * buffer that is acceptable for the codec if you do not use any horizontal
2954  * padding.
2955  *
2956  * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
2957  */
2959 
2960 /**
2961  * Modify width and height values so that they will result in a memory
2962  * buffer that is acceptable for the codec if you also ensure that all
2963  * line sizes are a multiple of the respective linesize_align[i].
2964  *
2965  * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
2966  */
2968  int linesize_align[AV_NUM_DATA_POINTERS]);
2969 
2970 /**
2971  * Converts AVChromaLocation to swscale x/y chroma position.
2972  *
2973  * The positions represent the chroma (0,0) position in a coordinates system
2974  * with luma (0,0) representing the origin and luma(1,1) representing 256,256
2975  *
2976  * @param xpos horizontal chroma sample position
2977  * @param ypos vertical chroma sample position
2978  */
2979 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
2980 
2981 /**
2982  * Converts swscale x/y chroma position to AVChromaLocation.
2983  *
2984  * The positions represent the chroma (0,0) position in a coordinates system
2985  * with luma (0,0) representing the origin and luma(1,1) representing 256,256
2986  *
2987  * @param xpos horizontal chroma sample position
2988  * @param ypos vertical chroma sample position
2989  */
2990 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
2991 
2992 #if FF_API_OLD_ENCDEC
2993 /**
2994  * Decode the audio frame of size avpkt->size from avpkt->data into frame.
2995  *
2996  * Some decoders may support multiple frames in a single AVPacket. Such
2997  * decoders would then just decode the first frame and the return value would be
2998  * less than the packet size. In this case, avcodec_decode_audio4 has to be
2999  * called again with an AVPacket containing the remaining data in order to
3000  * decode the second frame, etc... Even if no frames are returned, the packet
3001  * needs to be fed to the decoder with remaining data until it is completely
3002  * consumed or an error occurs.
3003  *
3004  * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
3005  * and output. This means that for some packets they will not immediately
3006  * produce decoded output and need to be flushed at the end of decoding to get
3007  * all the decoded data. Flushing is done by calling this function with packets
3008  * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
3009  * returning samples. It is safe to flush even those decoders that are not
3010  * marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
3011  *
3012  * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
3013  * larger than the actual read bytes because some optimized bitstream
3014  * readers read 32 or 64 bits at once and could read over the end.
3015  *
3016  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
3017  * before packets may be fed to the decoder.
3018  *
3019  * @param avctx the codec context
3020  * @param[out] frame The AVFrame in which to store decoded audio samples.
3021  * The decoder will allocate a buffer for the decoded frame by
3022  * calling the AVCodecContext.get_buffer2() callback.
3023  * When AVCodecContext.refcounted_frames is set to 1, the frame is
3024  * reference counted and the returned reference belongs to the
3025  * caller. The caller must release the frame using av_frame_unref()
3026  * when the frame is no longer needed. The caller may safely write
3027  * to the frame if av_frame_is_writable() returns 1.
3028  * When AVCodecContext.refcounted_frames is set to 0, the returned
3029  * reference belongs to the decoder and is valid only until the
3030  * next call to this function or until closing or flushing the
3031  * decoder. The caller may not write to it.
3032  * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3033  * non-zero. Note that this field being set to zero
3034  * does not mean that an error has occurred. For
3035  * decoders with AV_CODEC_CAP_DELAY set, no given decode
3036  * call is guaranteed to produce a frame.
3037  * @param[in] avpkt The input AVPacket containing the input buffer.
3038  * At least avpkt->data and avpkt->size should be set. Some
3039  * decoders might also require additional fields to be set.
3040  * @return A negative error code is returned if an error occurred during
3041  * decoding, otherwise the number of bytes consumed from the input
3042  * AVPacket is returned.
3043  *
3044 * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
3045  */
3048  int *got_frame_ptr, const AVPacket *avpkt);
3049 
3050 /**
3051  * Decode the video frame of size avpkt->size from avpkt->data into picture.
3052  * Some decoders may support multiple frames in a single AVPacket, such
3053  * decoders would then just decode the first frame.
3054  *
3055  * @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
3056  * the actual read bytes because some optimized bitstream readers read 32 or 64
3057  * bits at once and could read over the end.
3058  *
3059  * @warning The end of the input buffer buf should be set to 0 to ensure that
3060  * no overreading happens for damaged MPEG streams.
3061  *
3062  * @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
3063  * between input and output, these need to be fed with avpkt->data=NULL,
3064  * avpkt->size=0 at the end to return the remaining frames.
3065  *
3066  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
3067  * before packets may be fed to the decoder.
3068  *
3069  * @param avctx the codec context
3070  * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3071  * Use av_frame_alloc() to get an AVFrame. The codec will
3072  * allocate memory for the actual bitmap by calling the
3073  * AVCodecContext.get_buffer2() callback.
3074  * When AVCodecContext.refcounted_frames is set to 1, the frame is
3075  * reference counted and the returned reference belongs to the
3076  * caller. The caller must release the frame using av_frame_unref()
3077  * when the frame is no longer needed. The caller may safely write
3078  * to the frame if av_frame_is_writable() returns 1.
3079  * When AVCodecContext.refcounted_frames is set to 0, the returned
3080  * reference belongs to the decoder and is valid only until the
3081  * next call to this function or until closing or flushing the
3082  * decoder. The caller may not write to it.
3083  *
3084  * @param[in] avpkt The input AVPacket containing the input buffer.
3085  * You can create such packet with av_init_packet() and by then setting
3086  * data and size, some decoders might in addition need other fields like
3087  * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3088  * fields possible.
3089  * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3090  * @return On error a negative value is returned, otherwise the number of bytes
3091  * used or zero if no frame could be decompressed.
3092  *
3093  * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
3094  */
3096 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3097  int *got_picture_ptr,
3098  const AVPacket *avpkt);
3099 #endif
3100 
3101 /**
3102  * Decode a subtitle message.
3103  * Return a negative value on error, otherwise return the number of bytes used.
3104  * If no subtitle could be decompressed, got_sub_ptr is zero.
3105  * Otherwise, the subtitle is stored in *sub.
3106  * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3107  * simplicity, because the performance difference is expected to be negligible
3108  * and reusing a get_buffer written for video codecs would probably perform badly
3109  * due to a potentially very different allocation pattern.
3110  *
3111  * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
3112  * and output. This means that for some packets they will not immediately
3113  * produce decoded output and need to be flushed at the end of decoding to get
3114  * all the decoded data. Flushing is done by calling this function with packets
3115  * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
3116  * returning subtitles. It is safe to flush even those decoders that are not
3117  * marked with AV_CODEC_CAP_DELAY, then no subtitles will be returned.
3118  *
3119  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
3120  * before packets may be fed to the decoder.
3121  *
3122  * @param avctx the codec context
3123  * @param[out] sub The preallocated AVSubtitle in which the decoded subtitle will be stored,
3124  * must be freed with avsubtitle_free if *got_sub_ptr is set.
3125  * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3126  * @param[in] avpkt The input AVPacket containing the input buffer.
3127  */
3129  int *got_sub_ptr,
3130  AVPacket *avpkt);
3131 
3132 /**
3133  * Supply raw packet data as input to a decoder.
3134  *
3135  * Internally, this call will copy relevant AVCodecContext fields, which can
3136  * influence decoding per-packet, and apply them when the packet is actually
3137  * decoded. (For example AVCodecContext.skip_frame, which might direct the
3138  * decoder to drop the frame contained by the packet sent with this function.)
3139  *
3140  * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
3141  * larger than the actual read bytes because some optimized bitstream
3142  * readers read 32 or 64 bits at once and could read over the end.
3143  *
3144  * @warning Do not mix this API with the legacy API (like avcodec_decode_video2())
3145  * on the same AVCodecContext. It will return unexpected results now
3146  * or in future libavcodec versions.
3147  *
3148  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
3149  * before packets may be fed to the decoder.
3150  *
3151  * @param avctx codec context
3152  * @param[in] avpkt The input AVPacket. Usually, this will be a single video
3153  * frame, or several complete audio frames.
3154  * Ownership of the packet remains with the caller, and the
3155  * decoder will not write to the packet. The decoder may create
3156  * a reference to the packet data (or copy it if the packet is
3157  * not reference-counted).
3158  * Unlike with older APIs, the packet is always fully consumed,
3159  * and if it contains multiple frames (e.g. some audio codecs),
3160  * will require you to call avcodec_receive_frame() multiple
3161  * times afterwards before you can send a new packet.
3162  * It can be NULL (or an AVPacket with data set to NULL and
3163  * size set to 0); in this case, it is considered a flush
3164  * packet, which signals the end of the stream. Sending the
3165  * first flush packet will return success. Subsequent ones are
3166  * unnecessary and will return AVERROR_EOF. If the decoder
3167  * still has frames buffered, it will return them after sending
3168  * a flush packet.
3169  *
3170  * @return 0 on success, otherwise negative error code:
3171  * AVERROR(EAGAIN): input is not accepted in the current state - user
3172  * must read output with avcodec_receive_frame() (once
3173  * all output is read, the packet should be resent, and
3174  * the call will not fail with EAGAIN).
3175  * AVERROR_EOF: the decoder has been flushed, and no new packets can
3176  * be sent to it (also returned if more than 1 flush
3177  * packet is sent)
3178  * AVERROR(EINVAL): codec not opened, it is an encoder, or requires flush
3179  * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
3180  * other errors: legitimate decoding errors
3181  */
3182 int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt);
3183 
3184 /**
3185  * Return decoded output data from a decoder.
3186  *
3187  * @param avctx codec context
3188  * @param frame This will be set to a reference-counted video or audio
3189  * frame (depending on the decoder type) allocated by the
3190  * decoder. Note that the function will always call
3191  * av_frame_unref(frame) before doing anything else.
3192  *
3193  * @return
3194  * 0: success, a frame was returned
3195  * AVERROR(EAGAIN): output is not available in this state - user must try
3196  * to send new input
3197  * AVERROR_EOF: the decoder has been fully flushed, and there will be
3198  * no more output frames
3199  * AVERROR(EINVAL): codec not opened, or it is an encoder
3200  * AVERROR_INPUT_CHANGED: current decoded frame has changed parameters
3201  * with respect to first decoded frame. Applicable
3202  * when flag AV_CODEC_FLAG_DROPCHANGED is set.
3203  * other negative values: legitimate decoding errors
3204  */
3206 
3207 /**
3208  * Supply a raw video or audio frame to the encoder. Use avcodec_receive_packet()
3209  * to retrieve buffered output packets.
3210  *
3211  * @param avctx codec context
3212  * @param[in] frame AVFrame containing the raw audio or video frame to be encoded.
3213  * Ownership of the frame remains with the caller, and the
3214  * encoder will not write to the frame. The encoder may create
3215  * a reference to the frame data (or copy it if the frame is
3216  * not reference-counted).
3217  * It can be NULL, in which case it is considered a flush
3218  * packet. This signals the end of the stream. If the encoder
3219  * still has packets buffered, it will return them after this
3220  * call. Once flushing mode has been entered, additional flush
3221  * packets are ignored, and sending frames will return
3222  * AVERROR_EOF.
3223  *
3224  * For audio:
3225  * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
3226  * can have any number of samples.
3227  * If it is not set, frame->nb_samples must be equal to
3228  * avctx->frame_size for all frames except the last.
3229  * The final frame may be smaller than avctx->frame_size.
3230  * @return 0 on success, otherwise negative error code:
3231  * AVERROR(EAGAIN): input is not accepted in the current state - user
3232  * must read output with avcodec_receive_packet() (once
3233  * all output is read, the packet should be resent, and
3234  * the call will not fail with EAGAIN).
3235  * AVERROR_EOF: the encoder has been flushed, and no new frames can
3236  * be sent to it
3237  * AVERROR(EINVAL): codec not opened, refcounted_frames not set, it is a
3238  * decoder, or requires flush
3239  * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
3240  * other errors: legitimate encoding errors
3241  */
3242 int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame);
3243 
3244 /**
3245  * Read encoded data from the encoder.
3246  *
3247  * @param avctx codec context
3248  * @param avpkt This will be set to a reference-counted packet allocated by the
3249  * encoder. Note that the function will always call
3250  * av_packet_unref(avpkt) before doing anything else.
3251  * @return 0 on success, otherwise negative error code:
3252  * AVERROR(EAGAIN): output is not available in the current state - user
3253  * must try to send input
3254  * AVERROR_EOF: the encoder has been fully flushed, and there will be
3255  * no more output packets
3256  * AVERROR(EINVAL): codec not opened, or it is a decoder
3257  * other errors: legitimate encoding errors
3258  */
3259 int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt);
3260 
3261 /**
3262  * Create and return a AVHWFramesContext with values adequate for hardware
3263  * decoding. This is meant to get called from the get_format callback, and is
3264  * a helper for preparing a AVHWFramesContext for AVCodecContext.hw_frames_ctx.
3265  * This API is for decoding with certain hardware acceleration modes/APIs only.
3266  *
3267  * The returned AVHWFramesContext is not initialized. The caller must do this
3268  * with av_hwframe_ctx_init().
3269  *
3270  * Calling this function is not a requirement, but makes it simpler to avoid
3271  * codec or hardware API specific details when manually allocating frames.
3272  *
3273  * Alternatively to this, an API user can set AVCodecContext.hw_device_ctx,
3274  * which sets up AVCodecContext.hw_frames_ctx fully automatically, and makes
3275  * it unnecessary to call this function or having to care about
3276  * AVHWFramesContext initialization at all.
3277  *
3278  * There are a number of requirements for calling this function:
3279  *
3280  * - It must be called from get_format with the same avctx parameter that was
3281  * passed to get_format. Calling it outside of get_format is not allowed, and
3282  * can trigger undefined behavior.
3283  * - The function is not always supported (see description of return values).
3284  * Even if this function returns successfully, hwaccel initialization could
3285  * fail later. (The degree to which implementations check whether the stream
3286  * is actually supported varies. Some do this check only after the user's
3287  * get_format callback returns.)
3288  * - The hw_pix_fmt must be one of the choices suggested by get_format. If the
3289  * user decides to use a AVHWFramesContext prepared with this API function,
3290  * the user must return the same hw_pix_fmt from get_format.
3291  * - The device_ref passed to this function must support the given hw_pix_fmt.
3292  * - After calling this API function, it is the user's responsibility to
3293  * initialize the AVHWFramesContext (returned by the out_frames_ref parameter),
3294  * and to set AVCodecContext.hw_frames_ctx to it. If done, this must be done
3295  * before returning from get_format (this is implied by the normal
3296  * AVCodecContext.hw_frames_ctx API rules).
3297  * - The AVHWFramesContext parameters may change every time time get_format is
3298  * called. Also, AVCodecContext.hw_frames_ctx is reset before get_format. So
3299  * you are inherently required to go through this process again on every
3300  * get_format call.
3301  * - It is perfectly possible to call this function without actually using
3302  * the resulting AVHWFramesContext. One use-case might be trying to reuse a
3303  * previously initialized AVHWFramesContext, and calling this API function
3304  * only to test whether the required frame parameters have changed.
3305  * - Fields that use dynamically allocated values of any kind must not be set
3306  * by the user unless setting them is explicitly allowed by the documentation.
3307  * If the user sets AVHWFramesContext.free and AVHWFramesContext.user_opaque,
3308  * the new free callback must call the potentially set previous free callback.
3309  * This API call may set any dynamically allocated fields, including the free
3310  * callback.
3311  *
3312  * The function will set at least the following fields on AVHWFramesContext
3313  * (potentially more, depending on hwaccel API):
3314  *
3315  * - All fields set by av_hwframe_ctx_alloc().
3316  * - Set the format field to hw_pix_fmt.
3317  * - Set the sw_format field to the most suited and most versatile format. (An
3318  * implication is that this will prefer generic formats over opaque formats
3319  * with arbitrary restrictions, if possible.)
3320  * - Set the width/height fields to the coded frame size, rounded up to the
3321  * API-specific minimum alignment.
3322  * - Only _if_ the hwaccel requires a pre-allocated pool: set the initial_pool_size
3323  * field to the number of maximum reference surfaces possible with the codec,
3324  * plus 1 surface for the user to work (meaning the user can safely reference
3325  * at most 1 decoded surface at a time), plus additional buffering introduced
3326  * by frame threading. If the hwaccel does not require pre-allocation, the
3327  * field is left to 0, and the decoder will allocate new surfaces on demand
3328  * during decoding.
3329  * - Possibly AVHWFramesContext.hwctx fields, depending on the underlying
3330  * hardware API.
3331  *
3332  * Essentially, out_frames_ref returns the same as av_hwframe_ctx_alloc(), but
3333  * with basic frame parameters set.
3334  *
3335  * The function is stateless, and does not change the AVCodecContext or the
3336  * device_ref AVHWDeviceContext.
3337  *
3338  * @param avctx The context which is currently calling get_format, and which
3339  * implicitly contains all state needed for filling the returned
3340  * AVHWFramesContext properly.
3341  * @param device_ref A reference to the AVHWDeviceContext describing the device
3342  * which will be used by the hardware decoder.
3343  * @param hw_pix_fmt The hwaccel format you are going to return from get_format.
3344  * @param out_frames_ref On success, set to a reference to an _uninitialized_
3345  * AVHWFramesContext, created from the given device_ref.
3346  * Fields will be set to values required for decoding.
3347  * Not changed if an error is returned.
3348  * @return zero on success, a negative value on error. The following error codes
3349  * have special semantics:
3350  * AVERROR(ENOENT): the decoder does not support this functionality. Setup
3351  * is always manual, or it is a decoder which does not
3352  * support setting AVCodecContext.hw_frames_ctx at all,
3353  * or it is a software format.
3354  * AVERROR(EINVAL): it is known that hardware decoding is not supported for
3355  * this configuration, or the device_ref is not supported
3356  * for the hwaccel referenced by hw_pix_fmt.
3357  */
3359  AVBufferRef *device_ref,
3361  AVBufferRef **out_frames_ref);
3362 
3363 
3364 
3365 /**
3366  * @defgroup lavc_parsing Frame parsing
3367  * @{
3368  */
3369 
3372  AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
3373  AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
3374  AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
3375 };
3376 
3377 typedef struct AVCodecParserContext {
3378  void *priv_data;
3380  int64_t frame_offset; /* offset of the current frame */
3381  int64_t cur_offset; /* current offset
3382  (incremented by each av_parser_parse()) */
3383  int64_t next_frame_offset; /* offset of the next frame */
3384  /* video info */
3385  int pict_type; /* XXX: Put it back in AVCodecContext. */
3386  /**
3387  * This field is used for proper frame duration computation in lavf.
3388  * It signals, how much longer the frame duration of the current frame
3389  * is compared to normal frame duration.
3390  *
3391  * frame_duration = (1 + repeat_pict) * time_base
3392  *
3393  * It is used by codecs like H.264 to display telecined material.
3394  */
3395  int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3396  int64_t pts; /* pts of the current frame */
3397  int64_t dts; /* dts of the current frame */
3398 
3399  /* private data */
3400  int64_t last_pts;
3401  int64_t last_dts;
3403 
3404 #define AV_PARSER_PTS_NB 4
3409 
3410  int flags;
3411 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3412 #define PARSER_FLAG_ONCE 0x0002
3413 /// Set if the parser has a valid file offset
3414 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3415 #define PARSER_FLAG_USE_CODEC_TS 0x1000
3416 
3417  int64_t offset; ///< byte offset from starting packet start
3419 
3420  /**
3421  * Set by parser to 1 for key frames and 0 for non-key frames.
3422  * It is initialized to -1, so if the parser doesn't set this flag,
3423  * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3424  * will be used.
3425  */
3427 
3428 #if FF_API_CONVERGENCE_DURATION
3429  /**
3430  * @deprecated unused
3431  */
3434 #endif
3435 
3436  // Timestamp generation support:
3437  /**
3438  * Synchronization point for start of timestamp generation.
3439  *
3440  * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3441  * (default).
3442  *
3443  * For example, this corresponds to presence of H.264 buffering period
3444  * SEI message.
3445  */
3447 
3448  /**
3449  * Offset of the current timestamp against last timestamp sync point in
3450  * units of AVCodecContext.time_base.
3451  *
3452  * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3453  * contain a valid timestamp offset.
3454  *
3455  * Note that the timestamp of sync point has usually a nonzero
3456  * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3457  * the next frame after timestamp sync point will be usually 1.
3458  *
3459  * For example, this corresponds to H.264 cpb_removal_delay.
3460  */
3462 
3463  /**
3464  * Presentation delay of current frame in units of AVCodecContext.time_base.
3465  *
3466  * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3467  * contain valid non-negative timestamp delta (presentation time of a frame
3468  * must not lie in the past).
3469  *
3470  * This delay represents the difference between decoding and presentation
3471  * time of the frame.
3472  *
3473  * For example, this corresponds to H.264 dpb_output_delay.
3474  */
3476 
3477  /**
3478  * Position of the packet in file.
3479  *
3480  * Analogous to cur_frame_pts/dts
3481  */
3483 
3484  /**
3485  * Byte position of currently parsed frame in stream.
3486  */
3487  int64_t pos;
3488 
3489  /**
3490  * Previous frame byte position.
3491  */
3492  int64_t last_pos;
3493 
3494  /**
3495  * Duration of the current frame.
3496  * For audio, this is in units of 1 / AVCodecContext.sample_rate.
3497  * For all other types, this is in units of AVCodecContext.time_base.
3498  */
3500 
3502 
3503  /**
3504  * Indicate whether a picture is coded as a frame, top field or bottom field.
3505  *
3506  * For example, H.264 field_pic_flag equal to 0 corresponds to
3507  * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
3508  * equal to 1 and bottom_field_flag equal to 0 corresponds to
3509  * AV_PICTURE_STRUCTURE_TOP_FIELD.
3510  */
3512 
3513  /**
3514  * Picture number incremented in presentation or output order.
3515  * This field may be reinitialized at the first picture of a new sequence.
3516  *
3517  * For example, this corresponds to H.264 PicOrderCnt.
3518  */
3520 
3521  /**
3522  * Dimensions of the decoded video intended for presentation.
3523  */
3524  int width;
3525  int height;
3526 
3527  /**
3528  * Dimensions of the coded video.
3529  */
3532 
3533  /**
3534  * The format of the coded data, corresponds to enum AVPixelFormat for video
3535  * and for enum AVSampleFormat for audio.
3536  *
3537  * Note that a decoder can have considerable freedom in how exactly it
3538  * decodes the data, so the format reported here might be different from the
3539  * one returned by a decoder.
3540  */
3541  int format;
3543 
3544 typedef struct AVCodecParser {
3545  int codec_ids[5]; /* several codec IDs are permitted */
3548  /* This callback never returns an error, a negative value means that
3549  * the frame start was in a previous packet. */
3551  AVCodecContext *avctx,
3552  const uint8_t **poutbuf, int *poutbuf_size,
3553  const uint8_t *buf, int buf_size);
3555  int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3556 #if FF_API_NEXT
3559 #endif
3560 } AVCodecParser;
3561 
3562 /**
3563  * Iterate over all registered codec parsers.
3564  *
3565  * @param opaque a pointer where libavcodec will store the iteration state. Must
3566  * point to NULL to start the iteration.
3567  *
3568  * @return the next registered codec parser or NULL when the iteration is
3569  * finished
3570  */
3571 const AVCodecParser *av_parser_iterate(void **opaque);
3572 
3573 #if FF_API_NEXT
3576 
3579 #endif
3581 
3582 /**
3583  * Parse a packet.
3584  *
3585  * @param s parser context.
3586  * @param avctx codec context.
3587  * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3588  * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3589  * @param buf input buffer.
3590  * @param buf_size buffer size in bytes without the padding. I.e. the full buffer
3591  size is assumed to be buf_size + AV_INPUT_BUFFER_PADDING_SIZE.
3592  To signal EOF, this should be 0 (so that the last frame
3593  can be output).
3594  * @param pts input presentation timestamp.
3595  * @param dts input decoding timestamp.
3596  * @param pos input byte position in stream.
3597  * @return the number of bytes of the input bitstream used.
3598  *
3599  * Example:
3600  * @code
3601  * while(in_len){
3602  * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3603  * in_data, in_len,
3604  * pts, dts, pos);
3605  * in_data += len;
3606  * in_len -= len;
3607  *
3608  * if(size)
3609  * decode_frame(data, size);
3610  * }
3611  * @endcode
3612  */
3614  AVCodecContext *avctx,
3615  uint8_t **poutbuf, int *poutbuf_size,
3616  const uint8_t *buf, int buf_size,
3617  int64_t pts, int64_t dts,
3618  int64_t pos);
3619 
3620 #if FF_API_PARSER_CHANGE
3621 /**
3622  * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
3623  * @deprecated Use dump_extradata, remove_extra or extract_extradata
3624  * bitstream filters instead.
3625  */
3628  AVCodecContext *avctx,
3629  uint8_t **poutbuf, int *poutbuf_size,
3630  const uint8_t *buf, int buf_size, int keyframe);
3631 #endif
3633 
3634 /**
3635  * @}
3636  * @}
3637  */
3638 
3639 /**
3640  * @addtogroup lavc_encoding
3641  * @{
3642  */
3643 
3644 #if FF_API_OLD_ENCDEC
3645 /**
3646  * Encode a frame of audio.
3647  *
3648  * Takes input samples from frame and writes the next output packet, if
3649  * available, to avpkt. The output packet does not necessarily contain data for
3650  * the most recent frame, as encoders can delay, split, and combine input frames
3651  * internally as needed.
3652  *
3653  * @param avctx codec context
3654  * @param avpkt output AVPacket.
3655  * The user can supply an output buffer by setting
3656  * avpkt->data and avpkt->size prior to calling the
3657  * function, but if the size of the user-provided data is not
3658  * large enough, encoding will fail. If avpkt->data and
3659  * avpkt->size are set, avpkt->destruct must also be set. All
3660  * other AVPacket fields will be reset by the encoder using
3661  * av_init_packet(). If avpkt->data is NULL, the encoder will
3662  * allocate it. The encoder will set avpkt->size to the size
3663  * of the output packet.
3664  *
3665  * If this function fails or produces no output, avpkt will be
3666  * freed using av_packet_unref().
3667  * @param[in] frame AVFrame containing the raw audio data to be encoded.
3668  * May be NULL when flushing an encoder that has the
3669  * AV_CODEC_CAP_DELAY capability set.
3670  * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
3671  * can have any number of samples.
3672  * If it is not set, frame->nb_samples must be equal to
3673  * avctx->frame_size for all frames except the last.
3674  * The final frame may be smaller than avctx->frame_size.
3675  * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3676  * output packet is non-empty, and to 0 if it is
3677  * empty. If the function returns an error, the
3678  * packet can be assumed to be invalid, and the
3679  * value of got_packet_ptr is undefined and should
3680  * not be used.
3681  * @return 0 on success, negative error code on failure
3682  *
3683  * @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead.
3684  * If allowed and required, set AVCodecContext.get_encode_buffer to
3685  * a custom function to pass user supplied output buffers.
3686  */
3688 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
3689  const AVFrame *frame, int *got_packet_ptr);
3690 
3691 /**
3692  * Encode a frame of video.
3693  *
3694  * Takes input raw video data from frame and writes the next output packet, if
3695  * available, to avpkt. The output packet does not necessarily contain data for
3696  * the most recent frame, as encoders can delay and reorder input frames
3697  * internally as needed.
3698  *
3699  * @param avctx codec context
3700  * @param avpkt output AVPacket.
3701  * The user can supply an output buffer by setting
3702  * avpkt->data and avpkt->size prior to calling the
3703  * function, but if the size of the user-provided data is not
3704  * large enough, encoding will fail. All other AVPacket fields
3705  * will be reset by the encoder using av_init_packet(). If
3706  * avpkt->data is NULL, the encoder will allocate it.
3707  * The encoder will set avpkt->size to the size of the
3708  * output packet. The returned data (if any) belongs to the
3709  * caller, he is responsible for freeing it.
3710  *
3711  * If this function fails or produces no output, avpkt will be
3712  * freed using av_packet_unref().
3713  * @param[in] frame AVFrame containing the raw video data to be encoded.
3714  * May be NULL when flushing an encoder that has the
3715  * AV_CODEC_CAP_DELAY capability set.
3716  * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3717  * output packet is non-empty, and to 0 if it is
3718  * empty. If the function returns an error, the
3719  * packet can be assumed to be invalid, and the
3720  * value of got_packet_ptr is undefined and should
3721  * not be used.
3722  * @return 0 on success, negative error code on failure
3723  *
3724  * @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead.
3725  * If allowed and required, set AVCodecContext.get_encode_buffer to
3726  * a custom function to pass user supplied output buffers.
3727  */
3729 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
3730  const AVFrame *frame, int *got_packet_ptr);
3731 #endif
3732 
3733 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3734  const AVSubtitle *sub);
3735 
3736 
3737 /**
3738  * @}
3739  */
3740 
3741 #if FF_API_AVPICTURE
3742 /**
3743  * @addtogroup lavc_picture
3744  * @{
3745  */
3746 
3747 /**
3748  * @deprecated unused
3749  */
3751 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
3752 
3753 /**
3754  * @deprecated unused
3755  */
3757 void avpicture_free(AVPicture *picture);
3758 
3759 /**
3760  * @deprecated use av_image_fill_arrays() instead.
3761  */
3763 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
3764  enum AVPixelFormat pix_fmt, int width, int height);
3765 
3766 /**
3767  * @deprecated use av_image_copy_to_buffer() instead.
3768  */
3771  int width, int height,
3772  unsigned char *dest, int dest_size);
3773 
3774 /**
3775  * @deprecated use av_image_get_buffer_size() instead.
3776  */
3779 
3780 /**
3781  * @deprecated av_image_copy() instead.
3782  */
3784 void av_picture_copy(AVPicture *dst, const AVPicture *src,
3785  enum AVPixelFormat pix_fmt, int width, int height);
3786 
3787 /**
3788  * @deprecated unused
3789  */
3791 int av_picture_crop(AVPicture *dst, const AVPicture *src,
3792  enum AVPixelFormat pix_fmt, int top_band, int left_band);
3793 
3794 /**
3795  * @deprecated unused
3796  */
3798 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
3799  int padtop, int padbottom, int padleft, int padright, int *color);
3800 
3801 /**
3802  * @}
3803  */
3804 #endif
3805 
3806 /**
3807  * @defgroup lavc_misc Utility functions
3808  * @ingroup libavc
3809  *
3810  * Miscellaneous utility functions related to both encoding and decoding
3811  * (or neither).
3812  * @{
3813  */
3814 
3815 /**
3816  * @defgroup lavc_misc_pixfmt Pixel formats
3817  *
3818  * Functions for working with pixel formats.
3819  * @{
3820  */
3821 
3822 #if FF_API_GETCHROMA
3823 /**
3824  * @deprecated Use av_pix_fmt_get_chroma_sub_sample
3825  */
3826 
3828 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
3829 #endif
3830 
3831 /**
3832  * Return a value representing the fourCC code associated to the
3833  * pixel format pix_fmt, or 0 if no associated fourCC code can be
3834  * found.
3835  */
3837 
3838 /**
3839  * Find the best pixel format to convert to given a certain source pixel
3840  * format. When converting from one pixel format to another, information loss
3841  * may occur. For example, when converting from RGB24 to GRAY, the color
3842  * information will be lost. Similarly, other losses occur when converting from
3843  * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
3844  * the given pixel formats should be used to suffer the least amount of loss.
3845  * The pixel formats from which it chooses one, are determined by the
3846  * pix_fmt_list parameter.
3847  *
3848  *
3849  * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
3850  * @param[in] src_pix_fmt source pixel format
3851  * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3852  * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3853  * @return The best pixel format to convert to or -1 if none was found.
3854  */
3855 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
3856  enum AVPixelFormat src_pix_fmt,
3857  int has_alpha, int *loss_ptr);
3858 
3859 #if FF_API_AVCODEC_PIX_FMT
3860 /**
3861  * @deprecated see av_get_pix_fmt_loss()
3862  */
3864 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
3865  int has_alpha);
3866 /**
3867  * @deprecated see av_find_best_pix_fmt_of_2()
3868  */
3870 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
3871  enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
3872 
3874 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
3875  enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
3876 #endif
3877 
3879 
3880 /**
3881  * @}
3882  */
3883 
3884 #if FF_API_TAG_STRING
3885 /**
3886  * Put a string representing the codec tag codec_tag in buf.
3887  *
3888  * @param buf buffer to place codec tag in
3889  * @param buf_size size in bytes of buf
3890  * @param codec_tag codec tag to assign
3891  * @return the length of the string that would have been generated if
3892  * enough space had been available, excluding the trailing null
3893  *
3894  * @deprecated see av_fourcc_make_string() and av_fourcc2str().
3895  */
3897 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3898 #endif
3899 
3900 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3901 
3902 /**
3903  * Return a name for the specified profile, if available.
3904  *
3905  * @param codec the codec that is searched for the given profile
3906  * @param profile the profile value for which a name is requested
3907  * @return A name for the profile if found, NULL otherwise.
3908  */
3909 const char *av_get_profile_name(const AVCodec *codec, int profile);
3910 
3911 /**
3912  * Return a name for the specified profile, if available.
3913  *
3914  * @param codec_id the ID of the codec to which the requested profile belongs
3915  * @param profile the profile value for which a name is requested
3916  * @return A name for the profile if found, NULL otherwise.
3917  *
3918  * @note unlike av_get_profile_name(), which searches a list of profiles
3919  * supported by a specific decoder or encoder implementation, this
3920  * function searches the list of profiles from the AVCodecDescriptor
3921  */
3922 const char *avcodec_profile_name(enum AVCodecID codec_id, int profile);
3923 
3924 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3925 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3926 //FIXME func typedef
3927 
3928 /**
3929  * Fill AVFrame audio data and linesize pointers.
3930  *
3931  * The buffer buf must be a preallocated buffer with a size big enough
3932  * to contain the specified samples amount. The filled AVFrame data
3933  * pointers will point to this buffer.
3934  *
3935  * AVFrame extended_data channel pointers are allocated if necessary for
3936  * planar audio.
3937  *
3938  * @param frame the AVFrame
3939  * frame->nb_samples must be set prior to calling the
3940  * function. This function fills in frame->data,
3941  * frame->extended_data, frame->linesize[0].
3942  * @param nb_channels channel count
3943  * @param sample_fmt sample format
3944  * @param buf buffer to use for frame data
3945  * @param buf_size size of buffer
3946  * @param align plane size sample alignment (0 = default)
3947  * @return >=0 on success, negative error code on failure
3948  * @todo return the size in bytes required to store the samples in
3949  * case of success, at the next libavutil bump
3950  */
3952  enum AVSampleFormat sample_fmt, const uint8_t *buf,
3953  int buf_size, int align);
3954 
3955 /**
3956  * Reset the internal codec state / flush internal buffers. Should be called
3957  * e.g. when seeking or when switching to a different stream.
3958  *
3959  * @note for decoders, when refcounted frames are not used
3960  * (i.e. avctx->refcounted_frames is 0), this invalidates the frames previously
3961  * returned from the decoder. When refcounted frames are used, the decoder just
3962  * releases any references it might keep internally, but the caller's reference
3963  * remains valid.
3964  *
3965  * @note for encoders, this function will only do something if the encoder
3966  * declares support for AV_CODEC_CAP_ENCODER_FLUSH. When called, the encoder
3967  * will drain any remaining packets, and can then be re-used for a different
3968  * stream (as opposed to sending a null frame which will leave the encoder
3969  * in a permanent EOF state after draining). This can be desirable if the
3970  * cost of tearing down and replacing the encoder instance is high.
3971  */
3973 
3974 /**
3975  * Return codec bits per sample.
3976  *
3977  * @param[in] codec_id the codec
3978  * @return Number of bits per sample or zero if unknown for the given codec.
3979  */
3981 
3982 /**
3983  * Return the PCM codec associated with a sample format.
3984  * @param be endianness, 0 for little, 1 for big,
3985  * -1 (or anything else) for native
3986  * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
3987  */
3988 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
3989 
3990 /**
3991  * Return codec bits per sample.
3992  * Only return non-zero if the bits per sample is exactly correct, not an
3993  * approximation.
3994  *
3995  * @param[in] codec_id the codec
3996  * @return Number of bits per sample or zero if unknown for the given codec.
3997  */
3999 
4000 /**
4001  * Return audio frame duration.
4002  *
4003  * @param avctx codec context
4004  * @param frame_bytes size of the frame, or 0 if unknown
4005  * @return frame duration, in samples, if known. 0 if not able to
4006  * determine.
4007  */
4008 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
4009 
4010 /**
4011  * This function is the same as av_get_audio_frame_duration(), except it works
4012  * with AVCodecParameters instead of an AVCodecContext.
4013  */
4014 int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes);
4015 
4016 #if FF_API_OLD_BSF
4018  void *priv_data;
4019  const struct AVBitStreamFilter *filter;
4022  /**
4023  * Internal default arguments, used if NULL is passed to av_bitstream_filter_filter().
4024  * Not for access by library users.
4025  */
4026  char *args;
4028 
4029 /**
4030  * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
4031  * is deprecated. Use the new bitstream filtering API (using AVBSFContext).
4032  */
4035 /**
4036  * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
4037  * is deprecated. Use av_bsf_get_by_name(), av_bsf_alloc(), and av_bsf_init()
4038  * from the new bitstream filtering API (using AVBSFContext).
4039  */
4042 /**
4043  * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
4044  * is deprecated. Use av_bsf_send_packet() and av_bsf_receive_packet() from the
4045  * new bitstream filtering API (using AVBSFContext).
4046  */
4049  AVCodecContext *avctx, const char *args,
4050  uint8_t **poutbuf, int *poutbuf_size,
4051  const uint8_t *buf, int buf_size, int keyframe);
4052 /**
4053  * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
4054  * is deprecated. Use av_bsf_free() from the new bitstream filtering API (using
4055  * AVBSFContext).
4056  */
4059 /**
4060  * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
4061  * is deprecated. Use av_bsf_iterate() from the new bitstream filtering API (using
4062  * AVBSFContext).
4063  */
4066 #endif
4067 
4068 #if FF_API_NEXT
4070 const AVBitStreamFilter *av_bsf_next(void **opaque);
4071 #endif
4072 
4073 /* memory */
4074 
4075 /**
4076  * Same behaviour av_fast_malloc but the buffer has additional
4077  * AV_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
4078  *
4079  * In addition the whole buffer will initially and after resizes
4080  * be 0-initialized so that no uninitialized data will ever appear.
4081  */
4082 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4083 
4084 /**
4085  * Same behaviour av_fast_padded_malloc except that buffer will always
4086  * be 0-initialized after call.
4087  */
4088 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
4089 
4090 /**
4091  * Encode extradata length to a buffer. Used by xiph codecs.
4092  *
4093  * @param s buffer to write to; must be at least (v/255+1) bytes long
4094  * @param v size of extradata in bytes
4095  * @return number of bytes written to the buffer.
4096  */
4097 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4098 
4099 #if FF_API_USER_VISIBLE_AVHWACCEL
4100 /**
4101  * Register the hardware accelerator hwaccel.
4102  *
4103  * @deprecated This function doesn't do anything.
4104  */
4106 void av_register_hwaccel(AVHWAccel *hwaccel);
4107 
4108 /**
4109  * If hwaccel is NULL, returns the first registered hardware accelerator,
4110  * if hwaccel is non-NULL, returns the next registered hardware accelerator
4111  * after hwaccel, or NULL if hwaccel is the last one.
4112  *
4113  * @deprecated AVHWaccel structures contain no user-serviceable parts, so
4114  * this function should not be used.
4115  */
4117 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
4118 #endif
4119 
4120 #if FF_API_LOCKMGR
4121 /**
4122  * Lock operation used by lockmgr
4123  *
4124  * @deprecated Deprecated together with av_lockmgr_register().
4125  */
4126 enum AVLockOp {
4127  AV_LOCK_CREATE, ///< Create a mutex
4128  AV_LOCK_OBTAIN, ///< Lock the mutex
4129  AV_LOCK_RELEASE, ///< Unlock the mutex
4130  AV_LOCK_DESTROY, ///< Free mutex resources
4131 };
4132 
4133 /**
4134  * Register a user provided lock manager supporting the operations
4135  * specified by AVLockOp. The "mutex" argument to the function points
4136  * to a (void *) where the lockmgr should store/get a pointer to a user
4137  * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
4138  * value left by the last call for all other ops. If the lock manager is
4139  * unable to perform the op then it should leave the mutex in the same
4140  * state as when it was called and return a non-zero value. However,
4141  * when called with AV_LOCK_DESTROY the mutex will always be assumed to
4142  * have been successfully destroyed. If av_lockmgr_register succeeds
4143  * it will return a non-negative value, if it fails it will return a
4144  * negative value and destroy all mutex and unregister all callbacks.
4145  * av_lockmgr_register is not thread-safe, it must be called from a
4146  * single thread before any calls which make use of locking are used.
4147  *
4148  * @param cb User defined callback. av_lockmgr_register invokes calls
4149  * to this callback and the previously registered callback.
4150  * The callback will be used to create more than one mutex
4151  * each of which must be backed by its own underlying locking
4152  * mechanism (i.e. do not use a single static object to
4153  * implement your lock manager). If cb is set to NULL the
4154  * lockmgr will be unregistered.
4155  *
4156  * @deprecated This function does nothing, and always returns 0. Be sure to
4157  * build with thread support to get basic thread safety.
4158  */
4160 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4161 #endif
4162 
4163 /**
4164  * @return a positive value if s is open (i.e. avcodec_open2() was called on it
4165  * with no corresponding avcodec_close()), 0 otherwise.
4166  */
4168 
4169 /**
4170  * Allocate a CPB properties structure and initialize its fields to default
4171  * values.
4172  *
4173  * @param size if non-NULL, the size of the allocated struct will be written
4174  * here. This is useful for embedding it in side data.
4175  *
4176  * @return the newly allocated struct or NULL on failure
4177  */
4179 
4180 /**
4181  * @}
4182  */
4183 
4184 #endif /* AVCODEC_AVCODEC_H */
static double val(void *priv, double ch)
Definition: aeval.c:76
Macro definitions for various function/variable attributes.
uint8_t
#define AV_PARSER_PTS_NB
Definition: avcodec.h:3404
Convenience header that includes libavutil's core.
refcounted data buffer API
#define flags(name, subs,...)
Definition: cbs_av1.c:561
#define s(width, name)
Definition: cbs_vp9.c:257
#define f(width, name)
Definition: cbs_vp9.c:255
int nb_channels
audio channel layout utility functions
AVFieldOrder
Definition: codec_par.h:36
static enum AVPixelFormat pix_fmt
static AVFrame * frame
Public dictionary API.
static float sub(float src0, float src1)
static void encode(AVCodecContext *ctx, AVFrame *frame, AVPacket *pkt, FILE *output)
Definition: encode_audio.c:95
const OptionDef options[]
int
reference-counted frame API
#define AV_NUM_DATA_POINTERS
Definition: frame.h:319
int avcodec_parameters_from_context(AVCodecParameters *par, const AVCodecContext *codec)
Fill the parameters struct based on the values from the supplied codec context.
Definition: codec_par.c:90
int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
Definition: avcodec.c:144
attribute_deprecated const AVClass * avcodec_get_frame_class(void)
Definition: options.c:339
attribute_deprecated void av_codec_set_pkt_timebase(AVCodecContext *avctx, AVRational val)
int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec)
Definition: options.c:167
attribute_deprecated AVRational av_codec_get_pkt_timebase(const AVCodecContext *avctx)
Accessors for some AVCodecContext fields.
attribute_deprecated AVCodec * av_codec_next(const AVCodec *c)
If c is NULL, returns the first registered codec, if c is non-NULL, returns the next registered codec...
Definition: allcodecs.c:894
const AVClass * avcodec_get_subtitle_rect_class(void)
Get the AVClass for AVSubtitleRect.
Definition: options.c:365
attribute_deprecated const AVCodecDescriptor * av_codec_get_codec_descriptor(const AVCodecContext *avctx)
attribute_deprecated void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc)
attribute_deprecated void avcodec_register(AVCodec *codec)
Definition: allcodecs.c:889
attribute_deprecated void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val)
AVSubtitleType
Definition: avcodec.h:2667
attribute_deprecated int av_codec_get_lowres(const AVCodecContext *avctx)
attribute_deprecated uint16_t * av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx)
void avsubtitle_free(AVSubtitle *sub)
Free all allocated data in the given subtitle struct.
Definition: avcodec.c:551
attribute_deprecated void av_codec_set_lowres(AVCodecContext *avctx, int val)
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:46
const char * avcodec_configuration(void)
Return the libavcodec build-time configuration.
Definition: avcodec.c:56
attribute_deprecated unsigned av_codec_get_codec_properties(const AVCodecContext *avctx)
Definition: utils.c:439
int avcodec_parameters_to_context(AVCodecContext *codec, const AVCodecParameters *par)
Fill the codec context based on the values from the supplied codec parameters.
Definition: codec_par.c:147
attribute_deprecated int av_codec_get_seek_preroll(const AVCodecContext *avctx)
attribute_deprecated void av_codec_set_seek_preroll(AVCodecContext *avctx, int val)
AVAudioServiceType
Definition: avcodec.h:239
unsigned avcodec_version(void)
Return the LIBAVCODEC_VERSION_INT constant.
Definition: avcodec.c:46
attribute_deprecated int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)
Copy the settings of the source AVCodecContext into the destination AVCodecContext.
Definition: options.c:232
const char * avcodec_license(void)
Return the libavcodec license.
Definition: avcodec.c:61
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:173
const AVClass * avcodec_get_class(void)
Get the AVClass for AVCodecContext.
Definition: options.c:311
attribute_deprecated int av_codec_get_max_lowres(const AVCodec *codec)
Definition: utils.c:444
attribute_deprecated void avcodec_register_all(void)
Definition: allcodecs.c:904
int avcodec_close(AVCodecContext *avctx)
Close a given AVCodecContext and free all the data associated with it (but not the AVCodecContext its...
Definition: avcodec.c:570
void avcodec_free_context(AVCodecContext **avctx)
Free the codec context and everything associated with it and write NULL to the provided pointer.
Definition: options.c:188
@ SUBTITLE_BITMAP
A bitmap, pict will be set.
Definition: avcodec.h:2670
@ SUBTITLE_ASS
Formatted text, the ass field must be set by the decoder and is authoritative.
Definition: avcodec.h:2682
@ SUBTITLE_TEXT
Plain text, the text field must be set by the decoder and is authoritative.
Definition: avcodec.h:2676
@ SUBTITLE_NONE
Definition: avcodec.h:2668
@ AV_AUDIO_SERVICE_TYPE_VOICE_OVER
Definition: avcodec.h:247
@ AV_AUDIO_SERVICE_TYPE_EMERGENCY
Definition: avcodec.h:246
@ AV_AUDIO_SERVICE_TYPE_EFFECTS
Definition: avcodec.h:241
@ AV_AUDIO_SERVICE_TYPE_MAIN
Definition: avcodec.h:240
@ AV_AUDIO_SERVICE_TYPE_DIALOGUE
Definition: avcodec.h:244
@ AV_AUDIO_SERVICE_TYPE_KARAOKE
Definition: avcodec.h:248
@ AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED
Definition: avcodec.h:243
@ AV_AUDIO_SERVICE_TYPE_COMMENTARY
Definition: avcodec.h:245
@ AV_AUDIO_SERVICE_TYPE_NB
Not part of ABI.
Definition: avcodec.h:249
@ AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED
Definition: avcodec.h:242
int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags)
The default callback for AVCodecContext.get_buffer2().
Definition: decode.c:1686
int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
Return decoded output data from a decoder.
Definition: decode.c:643
int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos)
Converts AVChromaLocation to swscale x/y chroma position.
Definition: utils.c:333
enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos)
Converts swscale x/y chroma position to AVChromaLocation.
Definition: utils.c:345
void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height, int linesize_align[AV_NUM_DATA_POINTERS])
Modify width and height values so that they will result in a memory buffer that is acceptable for the...
Definition: utils.c:134
AVDiscard
Definition: avcodec.h:227
attribute_deprecated int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture, int *got_picture_ptr, const AVPacket *avpkt)
Decode the video frame of size avpkt->size from avpkt->data into picture.
Definition: decode.c:848
int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub, int *got_sub_ptr, AVPacket *avpkt)
Decode a subtitle message.
Definition: decode.c:1025
void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
Modify width and height values so that they will result in a memory buffer that is acceptable for the...
Definition: utils.c:318
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
Supply raw packet data as input to a decoder.
Definition: decode.c:580
int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt)
Read encoded data from the encoder.
Definition: encode.c:395
int avcodec_get_hw_frames_parameters(AVCodecContext *avctx, AVBufferRef *device_ref, enum AVPixelFormat hw_pix_fmt, AVBufferRef **out_frames_ref)
Create and return a AVHWFramesContext with values adequate for hardware decoding.
Definition: decode.c:1219
int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame)
Supply a raw video or audio frame to the encoder.
Definition: encode.c:364
attribute_deprecated int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, const AVPacket *avpkt)
Decode the audio frame of size avpkt->size from avpkt->data into frame.
Definition: decode.c:855
int avcodec_default_get_encode_buffer(AVCodecContext *s, AVPacket *pkt, int flags)
The default callback for AVCodecContext.get_encode_buffer().
Definition: encode.c:59
@ AVDISCARD_ALL
discard all
Definition: avcodec.h:236
@ AVDISCARD_NONKEY
discard all frames except keyframes
Definition: avcodec.h:235
@ AVDISCARD_BIDIR
discard all bidirectional frames
Definition: avcodec.h:233
@ AVDISCARD_DEFAULT
discard useless packets like 0 size packets in avi
Definition: avcodec.h:231
@ AVDISCARD_NONE
discard nothing
Definition: avcodec.h:230
@ AVDISCARD_NONINTRA
discard all non intra frames
Definition: avcodec.h:234
@ AVDISCARD_NONREF
discard all non reference
Definition: avcodec.h:232
attribute_deprecated int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Encode a frame of video.
Definition: encode.c:513
int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size, const AVSubtitle *sub)
Definition: encode.c:146
attribute_deprecated int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Encode a frame of audio.
Definition: encode.c:500
attribute_deprecated void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
Definition: imgconvert.c:38
attribute_deprecated int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt, int has_alpha)
Definition: imgconvert.c:48
enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
Definition: decode.c:1105
unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt)
Return a value representing the fourCC code associated to the pixel format pix_fmt,...
Definition: raw.c:305
enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
Find the best pixel format to convert to given a certain source pixel format.
Definition: imgconvert.c:68
attribute_deprecated enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
Definition: imgconvert.c:55
attribute_deprecated enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
Definition: imgconvert.c:61
attribute_deprecated AVHWAccel * av_hwaccel_next(const AVHWAccel *hwaccel)
If hwaccel is NULL, returns the first registered hardware accelerator, if hwaccel is non-NULL,...
Definition: utils.c:885
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
Definition: utils.c:50
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:613
const char * av_get_profile_name(const AVCodec *codec, int profile)
Return a name for the specified profile, if available.
Definition: utils.c:496
unsigned int av_xiphlacing(unsigned char *s, unsigned int v)
Encode extradata length to a buffer.
Definition: utils.c:852
int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes)
This function is the same as av_get_audio_frame_duration(), except it works with AVCodecParameters in...
Definition: utils.c:835
attribute_deprecated void av_bitstream_filter_close(AVBitStreamFilterContext *bsf)
int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes)
Return audio frame duration.
Definition: utils.c:826
int avcodec_default_execute2(AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2, int, int), void *arg, int *ret, int count)
attribute_deprecated int av_lockmgr_register(int(*cb)(void **mutex, enum AVLockOp op))
Register a user provided lock manager supporting the operations specified by AVLockOp.
Definition: avcodec.c:108
attribute_deprecated AVBitStreamFilterContext * av_bitstream_filter_init(const char *name)
int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels, enum AVSampleFormat sample_fmt, const uint8_t *buf, int buf_size, int align)
Fill AVFrame audio data and linesize pointers.
Definition: utils.c:356
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
Definition: avcodec.c:652
attribute_deprecated void av_register_bitstream_filter(AVBitStreamFilter *bsf)
attribute_deprecated void av_register_hwaccel(AVHWAccel *hwaccel)
Register the hardware accelerator hwaccel.
Definition: utils.c:890
AVLockOp
Lock operation used by lockmgr.
Definition: avcodec.h:4126
const char * avcodec_profile_name(enum AVCodecID codec_id, int profile)
Return a name for the specified profile, if available.
Definition: utils.c:509
AVCPBProperties * av_cpb_properties_alloc(size_t *size)
Allocate a CPB properties structure and initialize its fields to default values.
Definition: utils.c:1013
attribute_deprecated int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe)
int avcodec_is_open(AVCodecContext *s)
Definition: avcodec.c:848
int avcodec_default_execute(AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2), void *arg, int *ret, int count, int size)
Definition: avcodec.c:67
attribute_deprecated const AVBitStreamFilter * av_bitstream_filter_next(const AVBitStreamFilter *f)
int av_get_exact_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:524
attribute_deprecated const AVBitStreamFilter * av_bsf_next(void **opaque)
void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_padded_malloc except that buffer will always be 0-initialized after call.
Definition: utils.c:62
void avcodec_flush_buffers(AVCodecContext *avctx)
Reset the internal codec state / flush internal buffers.
Definition: avcodec.c:491
attribute_deprecated size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag)
Put a string representing the codec tag codec_tag in buf.
Definition: utils.c:475
enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be)
Return the PCM codec associated with a sample format.
Definition: utils.c:591
@ AV_LOCK_CREATE
Create a mutex.
Definition: avcodec.h:4127
@ AV_LOCK_RELEASE
Unlock the mutex.
Definition: avcodec.h:4129
@ AV_LOCK_DESTROY
Free mutex resources.
Definition: avcodec.h:4130
@ AV_LOCK_OBTAIN
Lock the mutex.
Definition: avcodec.h:4128
attribute_deprecated void av_register_codec_parser(AVCodecParser *parser)
Definition: parsers.c:106
AVCodecParserContext * av_parser_init(int codec_id)
Definition: parser.c:34
void av_parser_close(AVCodecParserContext *s)
Definition: parser.c:228
int av_parser_parse2(AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int64_t pts, int64_t dts, int64_t pos)
Parse a packet.
Definition: parser.c:120
const AVCodecParser * av_parser_iterate(void **opaque)
Iterate over all registered codec parsers.
Definition: parsers.c:113
AVPictureStructure
Definition: avcodec.h:3370
attribute_deprecated int av_parser_change(AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe)
Definition: parser.c:193
attribute_deprecated AVCodecParser * av_parser_next(const AVCodecParser *c)
Definition: parsers.c:96
@ AV_PICTURE_STRUCTURE_FRAME
Definition: avcodec.h:3374
@ AV_PICTURE_STRUCTURE_BOTTOM_FIELD
Definition: avcodec.h:3373
@ AV_PICTURE_STRUCTURE_TOP_FIELD
Definition: avcodec.h:3372
@ AV_PICTURE_STRUCTURE_UNKNOWN
Definition: avcodec.h:3371
attribute_deprecated void av_picture_copy(AVPicture *dst, const AVPicture *src, enum AVPixelFormat pix_fmt, int width, int height)
Definition: avpicture.c:75
attribute_deprecated void avpicture_free(AVPicture *picture)
Definition: avpicture.c:70
attribute_deprecated int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt, int width, int height, unsigned char *dest, int dest_size)
Definition: avpicture.c:44
attribute_deprecated int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright, int *color)
Definition: imgconvert.c:140
attribute_deprecated int avpicture_fill(AVPicture *picture, const uint8_t *ptr, enum AVPixelFormat pix_fmt, int width, int height)
Definition: avpicture.c:37
attribute_deprecated int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height)
Definition: avpicture.c:57
attribute_deprecated int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height)
Definition: avpicture.c:52
attribute_deprecated int av_picture_crop(AVPicture *dst, const AVPicture *src, enum AVPixelFormat pix_fmt, int top_band, int left_band)
Definition: imgconvert.c:109
AVMediaType
Definition: avutil.h:199
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
static enum AVPixelFormat hw_pix_fmt
Definition: hw_decode.c:46
cl_device_type type
static int op(uint8_t **dst, const uint8_t *dst_end, GetByteContext *gb, int pixel, int count, int *x, int width, int linesize)
Perform decode operation.
Definition: anm.c:75
int(* func)(AVBPrint *dst, const char *in, const char *arg)
Definition: jacosubdec.c:67
const char * arg
Definition: jacosubdec.c:66
const char * desc
Definition: libsvtav1.c:79
swscale version macros
static AVMutex mutex
Definition: log.c:44
static const uint64_t c2
Definition: murmur3.c:52
const char data[16]
Definition: mxf.c:142
pixel format definitions
AVChromaLocation
Location of chroma samples.
Definition: pixfmt.h:605
AVColorRange
Visual content value range.
Definition: pixfmt.h:551
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
AVColorPrimaries
Chromaticity coordinates of the source primaries.
Definition: pixfmt.h:458
AVColorTransferCharacteristic
Color Transfer Characteristic.
Definition: pixfmt.h:483
AVColorSpace
YUV colorspace type.
Definition: pixfmt.h:512
#define attribute_deprecated
Definition: print_options.c:39
const char * name
Definition: qsvenc.c:46
mfxU16 profile
Definition: qsvenc.c:45
Utilties for rational number calculation.
typedef void(RENAME(mix_any_func_type))
unsigned int pos
Definition: spdifenc.c:412
const struct AVBitStreamFilter * filter
Definition: avcodec.h:4019
char * args
Internal default arguments, used if NULL is passed to av_bitstream_filter_filter().
Definition: avcodec.h:4026
struct AVBitStreamFilterContext * next
Definition: avcodec.h:4021
AVCodecParserContext * parser
Definition: avcodec.h:4020
A reference to a data buffer.
Definition: buffer.h:84
This structure describes the bitrate properties of an encoded bitstream.
Definition: avcodec.h:453
int avg_bitrate
Average bitrate of the stream, in bits per second.
Definition: avcodec.h:477
uint64_t vbv_delay
The delay between the time the packet this structure is associated with is received and the time when...
Definition: avcodec.h:495
int min_bitrate
Minimum bitrate of the stream, in bits per second.
Definition: avcodec.h:468
int buffer_size
The size of the buffer to which the ratecontrol is applied, in bits.
Definition: avcodec.h:486
int max_bitrate
Maximum bitrate of the stream, in bits per second.
Definition: avcodec.h:459
Describe the class of an AVClass context structure.
Definition: log.h:67
main external API structure.
Definition: avcodec.h:536
attribute_deprecated int brd_scale
Definition: avcodec.h:1109
int nsse_weight
noise vs.
Definition: avcodec.h:1851
float rc_max_available_vbv_use
Ratecontrol attempt to use, at maximum, of what can be used without an underflow.
Definition: avcodec.h:1430
int skip_top
Number of macroblock rows at the top which are skipped.
Definition: avcodec.h:1069
int trellis
trellis RD quantization
Definition: avcodec.h:1487
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:746
attribute_deprecated int pre_me
Definition: avcodec.h:976
int64_t pts_correction_last_dts
PTS of the last frame.
Definition: avcodec.h:2102
int max_qdiff
maximum quantizer difference between frames
Definition: avcodec.h:1394
uint16_t * chroma_intra_matrix
custom intra quantization matrix
Definition: avcodec.h:2160
const AVCodecDescriptor * codec_descriptor
AVCodecDescriptor.
Definition: avcodec.h:2092
int hwaccel_flags
Bit set of AV_HWACCEL_FLAG_* flags, which affect hardware accelerated decoding (if active).
Definition: avcodec.h:2279
attribute_deprecated int min_prediction_order
Definition: avcodec.h:1492
int subtitle_header_size
Definition: avcodec.h:2017
int width
picture width / height.
Definition: avcodec.h:709
AVPacketSideData * coded_side_data
Additional data associated with the entire coded stream.
Definition: avcodec.h:2193
int64_t pts_correction_num_faulty_dts
Number of incorrect PTS values so far.
Definition: avcodec.h:2100
attribute_deprecated int i_count
Definition: avcodec.h:1539
char * stats_out
pass1 encoding statistics output buffer
Definition: avcodec.h:1557
int rc_buffer_size
decoder bitstream buffer size
Definition: avcodec.h:1401
attribute_deprecated int header_bits
Definition: avcodec.h:1533
int64_t pts_correction_last_pts
Number of incorrect DTS values so far.
Definition: avcodec.h:2101
attribute_deprecated int refcounted_frames
If non-zero, the decoded audio and video frames returned from avcodec_decode_video2() and avcodec_dec...
Definition: avcodec.h:1368
int me_cmp
motion estimation comparison function
Definition: avcodec.h:922
int flags2
AV_CODEC_FLAG2_*.
Definition: avcodec.h:623
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1204
int debug
debug
Definition: avcodec.h:1623
enum AVPixelFormat sw_pix_fmt
Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:2078
int global_quality
Global quality for codecs which cannot change it per frame.
Definition: avcodec.h:602
int64_t max_pixels
The number of pixels per image to maximally accept.
Definition: avcodec.h:2248
attribute_deprecated int coder_type
Definition: avcodec.h:1455
attribute_deprecated int scenechange_threshold
Definition: avcodec.h:1050
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:1171
char * sub_charenc
DTS of the last frame.
Definition: avcodec.h:2109
int error_concealment
error concealment flags
Definition: avcodec.h:1613
int dct_algo
DCT algorithm, see FF_DCT_* below.
Definition: avcodec.h:1706
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:561
int slice_flags
slice flags
Definition: avcodec.h:1014
int strict_std_compliance
strictly follow the standard (MPEG-4, ...).
Definition: avcodec.h:1601
float b_quant_offset
qscale offset between IP and B-frames
Definition: avcodec.h:818
int nb_coded_side_data
Definition: avcodec.h:2194
AVRational pkt_timebase
Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
Definition: avcodec.h:2085
attribute_deprecated int frame_bits
Definition: avcodec.h:1549
attribute_deprecated int chromaoffset
Definition: avcodec.h:1129
attribute_deprecated int mv_bits
Definition: avcodec.h:1531
enum AVPixelFormat(* get_format)(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
callback to negotiate the pixelFormat
Definition: avcodec.h:788
enum AVAudioServiceType audio_service_type
Type of service that the audio stream conveys.
Definition: avcodec.h:1261
enum AVColorPrimaries color_primaries
Chromaticity coordinates of the source primaries.
Definition: avcodec.h:1150
int me_subpel_quality
subpel ME quality
Definition: avcodec.h:998
AVBufferRef * hw_frames_ctx
A reference to the AVHWFramesContext describing the input (for encoding) or output (decoding) frames.
Definition: avcodec.h:2218
int max_b_frames
maximum number of B-frames between non-B-frames Note: The output will be delayed by max_b_frames+1 re...
Definition: avcodec.h:796
int mb_lmax
maximum MB Lagrange multiplier
Definition: avcodec.h:1090
int qmin
minimum quantizer
Definition: avcodec.h:1380
int keyint_min
minimum GOP size
Definition: avcodec.h:1117
enum AVMediaType codec_type
Definition: avcodec.h:544
float b_quant_factor
qscale factor between IP and B-frames If > 0 then the last P-frame quantizer will be used (q= lastp_q...
Definition: avcodec.h:805
int dia_size
ME diamond size & shape.
Definition: avcodec.h:964
attribute_deprecated int debug_mv
Definition: avcodec.h:2149
int workaround_bugs
Work around bugs in encoders which sometimes cannot be detected automatically.
Definition: avcodec.h:1572
attribute_deprecated int b_sensitivity
Definition: avcodec.h:1142
int apply_cropping
Video decoding only.
Definition: avcodec.h:2306
AVRational framerate
Definition: avcodec.h:2071
int bidir_refine
Definition: avcodec.h:1104
char * stats_in
pass2 encoding statistics input buffer Concatenated stuff from stats_out of pass1 should be placed he...
Definition: avcodec.h:1565
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel.
Definition: avcodec.h:915
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:1740
int rc_override_count
ratecontrol override, see RcOverride
Definition: avcodec.h:1408
uint8_t * dump_separator
dump format separator.
Definition: avcodec.h:2168
attribute_deprecated AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:1764
int slice_count
slice count
Definition: avcodec.h:890
attribute_deprecated int max_prediction_order
Definition: avcodec.h:1496
int ticks_per_frame
For some codecs, the time base is closer to the field rate than the frame rate.
Definition: avcodec.h:668
enum AVFieldOrder field_order
Field order.
Definition: avcodec.h:1193
uint16_t * inter_matrix
custom inter quantization matrix Must be allocated with the av_malloc() family of functions,...
Definition: avcodec.h:1045
const struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:1680
int active_thread_type
Which multithreading methods are in use by the codec.
Definition: avcodec.h:1792
int(* get_encode_buffer)(struct AVCodecContext *s, AVPacket *pkt, int flags)
This callback is called at the beginning of each packet to get a data buffer for it.
Definition: avcodec.h:2384
int sub_charenc_mode
Subtitles character encoding mode.
Definition: avcodec.h:2117
int64_t reordered_opaque
opaque 64-bit number (generally a PTS) that will be reordered and output in AVFrame....
Definition: avcodec.h:1673
int bit_rate_tolerance
number of bits the bitstream is allowed to diverge from the reference.
Definition: avcodec.h:594
int mb_decision
macroblock decision mode
Definition: avcodec.h:1024
attribute_deprecated int misc_bits
Definition: avcodec.h:1545
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:826
char * codec_whitelist
',' separated list of allowed decoders.
Definition: avcodec.h:2176
int level
level
Definition: avcodec.h:1984
void(* draw_horiz_band)(struct AVCodecContext *s, const AVFrame *src, int offset[AV_NUM_DATA_POINTERS], int y, int type, int height)
If non NULL, 'draw_horiz_band' is called by the libavcodec decoder to draw a horizontal band.
Definition: avcodec.h:771
attribute_deprecated int frame_skip_threshold
Definition: avcodec.h:1467
int64_t bit_rate
the average bitrate
Definition: avcodec.h:586
enum AVDiscard skip_loop_filter
Skip loop filtering for selected frames.
Definition: avcodec.h:1992
int64_t pts_correction_num_faulty_pts
Current statistics for PTS correction.
Definition: avcodec.h:2099
const struct AVCodec * codec
Definition: avcodec.h:545
int rc_initial_buffer_occupancy
Number of bits which should be loaded into the rc buffer before decoding starts.
Definition: avcodec.h:1444
int thread_type
Which multithreading methods to use.
Definition: avcodec.h:1783
attribute_deprecated int frame_skip_cmp
Definition: avcodec.h:1479
int me_sub_cmp
subpixel motion estimation comparison function
Definition: avcodec.h:928
attribute_deprecated int p_count
Definition: avcodec.h:1541
int profile
profile
Definition: avcodec.h:1858
unsigned properties
Properties of the stream that gets decoded.
Definition: avcodec.h:2183
int last_predictor_count
amount of previous MV predictors (2a+1 x 2a+1 square)
Definition: avcodec.h:971
int log_level_offset
Definition: avcodec.h:542
int(* execute)(struct AVCodecContext *c, int(*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size)
The codec may call this to execute several independent things.
Definition: avcodec.h:1824
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:1747
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:1719
int export_side_data
Bit set of AV_CODEC_EXPORT_DATA_* flags, which affects the kind of metadata exported in frame,...
Definition: avcodec.h:2346
enum AVColorSpace colorspace
YUV colorspace type.
Definition: avcodec.h:1164
int sub_text_format
Control the form of AVSubtitle.rects[N]->ass.
Definition: avcodec.h:2225
enum AVSampleFormat request_sample_fmt
desired sample format
Definition: avcodec.h:1269
attribute_deprecated int mpeg_quant
Definition: avcodec.h:831
int initial_padding
Audio only.
Definition: avcodec.h:2062
float temporal_cplx_masking
temporary complexity masking (0-> disabled)
Definition: avcodec.h:862
int sample_rate
samples per second
Definition: avcodec.h:1196
const AVClass * av_class
information on struct for av_log
Definition: avcodec.h:541
float p_masking
p block masking (0-> disabled)
Definition: avcodec.h:876
int delay
Codec delay.
Definition: avcodec.h:692
float dark_masking
darkness masking (0-> disabled)
Definition: avcodec.h:883
attribute_deprecated int64_t timecode_frame_start
Definition: avcodec.h:1500
int mb_cmp
macroblock comparison function (not supported yet)
Definition: avcodec.h:934
int gop_size
the number of pictures in a group of pictures, or 0 for intra_only
Definition: avcodec.h:731
uint64_t request_channel_layout
Request decoder to use this channel layout if it can (0 for default)
Definition: avcodec.h:1254
int frame_number
Frame counter, set by libavcodec.
Definition: avcodec.h:1227
attribute_deprecated int rtp_payload_size
Definition: avcodec.h:1520
int skip_alpha
Skip processing alpha if supported by codec.
Definition: avcodec.h:2135
int refs
number of reference frames
Definition: avcodec.h:1124
int ildct_cmp
interlaced DCT comparison function
Definition: avcodec.h:940
attribute_deprecated int thread_safe_callbacks
Set by the client if its custom get_buffer() callback can be called synchronously from another thread...
Definition: avcodec.h:1812
int mv0_threshold
Note: Value depends upon the compare function used for fullpel ME.
Definition: avcodec.h:1137
int mb_lmin
minimum MB Lagrange multiplier
Definition: avcodec.h:1083
int64_t rc_max_rate
maximum bitrate
Definition: avcodec.h:1416
int compression_level
Definition: avcodec.h:608
int discard_damaged_percentage
The percentage of damaged samples to discard a frame.
Definition: avcodec.h:2328
attribute_deprecated int me_penalty_compensation
Definition: avcodec.h:1097
int thread_count
thread count is used to decide how many independent tasks should be passed to execute()
Definition: avcodec.h:1773
void * opaque
Private data of the user, can be used to carry app specific stuff.
Definition: avcodec.h:578
int qmax
maximum quantizer
Definition: avcodec.h:1387
void * hwaccel_context
Hardware accelerator context.
Definition: avcodec.h:1692
uint16_t * intra_matrix
custom intra quantization matrix Must be allocated with the av_malloc() family of functions,...
Definition: avcodec.h:1036
int coded_height
Definition: avcodec.h:724
enum AVColorTransferCharacteristic color_trc
Color Transfer Characteristic.
Definition: avcodec.h:1157
float rc_min_vbv_overflow_use
Ratecontrol attempt to use, at least, times the amount needed to prevent a vbv overflow.
Definition: avcodec.h:1437
uint8_t * subtitle_header
Header containing style information for text subtitles.
Definition: avcodec.h:2016
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition: avcodec.h:659
attribute_deprecated int i_tex_bits
Definition: avcodec.h:1535
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:616
int seek_preroll
Number of samples to skip after a discontinuity.
Definition: avcodec.h:2142
attribute_deprecated int frame_skip_exp
Definition: avcodec.h:1475
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:637
int me_pre_cmp
motion estimation prepass comparison function
Definition: avcodec.h:984
attribute_deprecated int prediction_method
Definition: avcodec.h:895
int channels
number of audio channels
Definition: avcodec.h:1197
int64_t rc_min_rate
minimum bitrate
Definition: avcodec.h:1423
int trailing_padding
Audio only.
Definition: avcodec.h:2240
enum AVDiscard skip_idct
Skip IDCT/dequantization for selected frames.
Definition: avcodec.h:1999
int intra_dc_precision
precision of the intra DC coefficient - 8
Definition: avcodec.h:1062
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:1178
int(* execute2)(struct AVCodecContext *c, int(*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count)
The codec may call this to execute several independent things.
Definition: avcodec.h:1844
uint64_t error[AV_NUM_DATA_POINTERS]
error
Definition: avcodec.h:1699
attribute_deprecated int p_tex_bits
Definition: avcodec.h:1537
attribute_deprecated int context_model
Definition: avcodec.h:1461
float qcompress
amount of qscale change between easy & hard scenes (0.0-1.0)
Definition: avcodec.h:1372
float qblur
amount of qscale smoothing over time (0.0-1.0)
Definition: avcodec.h:1373
AVBufferRef * hw_device_ctx
A reference to the AVHWDeviceContext describing the device which will be used by a hardware encoder/d...
Definition: avcodec.h:2270
int me_range
maximum motion estimation search range in subpel units If 0 then no limit.
Definition: avcodec.h:1007
attribute_deprecated int noise_reduction
Definition: avcodec.h:1054
int extra_hw_frames
Definition: avcodec.h:2320
attribute_deprecated int side_data_only_packets
Encoding only and set by default.
Definition: avcodec.h:2044
attribute_deprecated int skip_count
Definition: avcodec.h:1543
RcOverride * rc_override
Definition: avcodec.h:1409
int64_t max_samples
The number of samples per frame to maximally accept.
Definition: avcodec.h:2336
enum AVCodecID codec_id
Definition: avcodec.h:546
attribute_deprecated int b_frame_strategy
Definition: avcodec.h:810
int pre_dia_size
ME prepass diamond size & shape.
Definition: avcodec.h:991
float lumi_masking
luminance masking (0-> disabled)
Definition: avcodec.h:855
int extradata_size
Definition: avcodec.h:638
int cutoff
Audio cutoff bandwidth (0 means "automatic")
Definition: avcodec.h:1240
int skip_bottom
Number of macroblock rows at the bottom which are skipped.
Definition: avcodec.h:1076
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:724
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs.
Definition: avcodec.h:1233
attribute_deprecated void(* rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb)
Definition: avcodec.h:1514
attribute_deprecated int frame_skip_factor
Definition: avcodec.h:1471
attribute_deprecated uint64_t vbv_delay
VBV delay coded in the last frame (in periods of a 27 MHz clock).
Definition: avcodec.h:2029
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1247
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:1216
int * slice_offset
slice offsets in the frame in bytes
Definition: avcodec.h:906
float i_quant_factor
qscale factor between P- and I-frames If > 0 then the last P-frame quantizer will be used (q = lastp_...
Definition: avcodec.h:841
int(* get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags)
This callback is called at the beginning of each frame to get data buffer(s) for it.
Definition: avcodec.h:1351
int lowres
low resolution decoding, 1-> 1/2 size, 2->1/4 size
Definition: avcodec.h:1754
void * priv_data
Definition: avcodec.h:563
float spatial_cplx_masking
spatial complexity masking (0-> disabled)
Definition: avcodec.h:869
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:2006
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:1645
float i_quant_offset
qscale offset between P and I-frames
Definition: avcodec.h:848
int slices
Number of slices.
Definition: avcodec.h:1187
This struct describes the properties of a single codec described by an AVCodecID.
Definition: codec_desc.h:38
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
int duration
Duration of the current frame.
Definition: avcodec.h:3499
int dts_ref_dts_delta
Offset of the current timestamp against last timestamp sync point in units of AVCodecContext....
Definition: avcodec.h:3461
int64_t cur_frame_end[AV_PARSER_PTS_NB]
Definition: avcodec.h:3418
int width
Dimensions of the decoded video intended for presentation.
Definition: avcodec.h:3524
enum AVFieldOrder field_order
Definition: avcodec.h:3501
struct AVCodecParser * parser
Definition: avcodec.h:3379
int64_t pos
Byte position of currently parsed frame in stream.
Definition: avcodec.h:3487
int format
The format of the coded data, corresponds to enum AVPixelFormat for video and for enum AVSampleFormat...
Definition: avcodec.h:3541
int repeat_pict
This field is used for proper frame duration computation in lavf.
Definition: avcodec.h:3395
enum AVPictureStructure picture_structure
Indicate whether a picture is coded as a frame, top field or bottom field.
Definition: avcodec.h:3511
int64_t cur_frame_dts[AV_PARSER_PTS_NB]
Definition: avcodec.h:3408
int64_t cur_frame_pos[AV_PARSER_PTS_NB]
Position of the packet in file.
Definition: avcodec.h:3482
attribute_deprecated int64_t convergence_duration
Definition: avcodec.h:3433
int output_picture_number
Picture number incremented in presentation or output order.
Definition: avcodec.h:3519
int pts_dts_delta
Presentation delay of current frame in units of AVCodecContext.time_base.
Definition: avcodec.h:3475
int64_t next_frame_offset
Definition: avcodec.h:3383
int64_t cur_frame_pts[AV_PARSER_PTS_NB]
Definition: avcodec.h:3407
int64_t cur_frame_offset[AV_PARSER_PTS_NB]
Definition: avcodec.h:3406
int key_frame
Set by parser to 1 for key frames and 0 for non-key frames.
Definition: avcodec.h:3426
int64_t frame_offset
Definition: avcodec.h:3380
int64_t last_pos
Previous frame byte position.
Definition: avcodec.h:3492
int coded_width
Dimensions of the coded video.
Definition: avcodec.h:3530
int64_t offset
byte offset from starting packet start
Definition: avcodec.h:3417
int dts_sync_point
Synchronization point for start of timestamp generation.
Definition: avcodec.h:3446
int codec_ids[5]
Definition: avcodec.h:3545
int priv_data_size
Definition: avcodec.h:3546
int(* split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: avcodec.h:3555
void(* parser_close)(AVCodecParserContext *s)
Definition: avcodec.h:3554
int(* parser_parse)(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size)
Definition: avcodec.h:3550
int(* parser_init)(AVCodecParserContext *s)
Definition: avcodec.h:3547
attribute_deprecated struct AVCodecParser * next
Definition: avcodec.h:3558
AVCodec.
Definition: codec.h:197
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
int priv_data_size
Size of the private data to allocate in AVCodecInternal.hwaccel_priv_data.
Definition: avcodec.h:2582
int(* alloc_frame)(AVCodecContext *avctx, AVFrame *frame)
Allocate a custom buffer.
Definition: avcodec.h:2484
int(* uninit)(AVCodecContext *avctx)
Uninitialize the hwaccel private data.
Definition: avcodec.h:2576
enum AVCodecID id
Codec implemented by the hardware accelerator.
Definition: avcodec.h:2458
int(* start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Called at the beginning of each frame or field picture.
Definition: avcodec.h:2500
void(* decode_mb)(struct MpegEncContext *s)
Called for every Macroblock in a slice.
Definition: avcodec.h:2559
int(* init)(AVCodecContext *avctx)
Initialize the hwaccel private data.
Definition: avcodec.h:2568
const char * name
Name of the hardware accelerated codec.
Definition: avcodec.h:2444
int capabilities
Hardware accelerated codec capabilities.
Definition: avcodec.h:2471
int(* decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Callback for each slice.
Definition: avcodec.h:2528
int(* frame_params)(AVCodecContext *avctx, AVBufferRef *hw_frames_ctx)
Fill the given hw_frames context with current codec parameters.
Definition: avcodec.h:2597
int(* decode_params)(AVCodecContext *avctx, int type, const uint8_t *buf, uint32_t buf_size)
Callback for parameter data (SPS/PPS/VPS etc).
Definition: avcodec.h:2514
enum AVPixelFormat pix_fmt
Supported pixel format.
Definition: avcodec.h:2465
int caps_internal
Internal hwaccel capabilities.
Definition: avcodec.h:2587
int(* end_frame)(AVCodecContext *avctx)
Called at the end of each frame or field picture.
Definition: avcodec.h:2539
int frame_priv_data_size
Size of per-frame hardware accelerator private data.
Definition: avcodec.h:2548
enum AVMediaType type
Type of codec implemented by the hardware accelerator.
Definition: avcodec.h:2451
This structure stores compressed data.
Definition: packet.h:346
Pan Scan area.
Definition: avcodec.h:424
int id
id
Definition: avcodec.h:430
int width
width and height in 1/16 pel
Definition: avcodec.h:437
int height
Definition: avcodec.h:438
int16_t position[3][2]
position of the top left corner in 1/16 pel for up to 3 fields/frames
Definition: avcodec.h:445
Picture data structure.
Definition: avcodec.h:2655
attribute_deprecated uint8_t * data[AV_NUM_DATA_POINTERS]
pointers to the image data planes
Definition: avcodec.h:2657
attribute_deprecated int linesize[AV_NUM_DATA_POINTERS]
number of bytes per line
Definition: avcodec.h:2659
This structure supplies correlation between a packet timestamp and a wall clock production time.
Definition: avcodec.h:503
int64_t wallclock
A UTC timestamp, in microseconds, since Unix epoch (e.g, av_gettime()).
Definition: avcodec.h:507
Rational number (pair of numerator and denominator).
Definition: rational.h:58
int x
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:2688
char * ass
0 terminated ASS/SSA compatible event line.
Definition: avcodec.h:2717
int w
width of pict, undefined when pict is not set
Definition: avcodec.h:2690
attribute_deprecated AVPicture pict
Definition: avcodec.h:2699
int nb_colors
number of colors in pict, undefined when pict is not set
Definition: avcodec.h:2692
char * text
0 terminated plain UTF-8 text
Definition: avcodec.h:2710
uint8_t * data[4]
data+linesize for the bitmap of this subtitle.
Definition: avcodec.h:2705
int y
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:2689
enum AVSubtitleType type
Definition: avcodec.h:2708
int linesize[4]
Definition: avcodec.h:2706
int h
height of pict, undefined when pict is not set
Definition: avcodec.h:2691
uint16_t format
Definition: avcodec.h:2723
uint32_t start_display_time
Definition: avcodec.h:2724
uint32_t end_display_time
Definition: avcodec.h:2725
unsigned num_rects
Definition: avcodec.h:2726
AVSubtitleRect ** rects
Definition: avcodec.h:2727
int64_t pts
Same as packet pts, in AV_TIME_BASE.
Definition: avcodec.h:2728
MpegEncContext.
Definition: mpegvideo.h:81
struct AVCodecContext * avctx
Definition: mpegvideo.h:98
int qscale
Definition: avcodec.h:258
int start_frame
Definition: avcodec.h:256
int end_frame
Definition: avcodec.h:257
float quality_factor
Definition: avcodec.h:259
#define src
Definition: vp8dsp.c:255
AVPacket * pkt
Definition: movenc.c:59
#define height
#define width
static int64_t pts
int size
enum AVCodecID codec_id
Definition: vaapi_decode.c:369
static double cb(void *priv, double x, double y)
Definition: vf_geq.c:215
static const uint8_t offset[127][2]
Definition: vf_spp.c:107
static double c[64]