FFmpeg  4.4
ape.c
Go to the documentation of this file.
1 /*
2  * Monkey's Audio APE demuxer
3  * Copyright (c) 2007 Benjamin Zores <ben@geexbox.org>
4  * based upon libdemac from Dave Chapman.
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include <stdio.h>
24 
25 #include "libavutil/intreadwrite.h"
26 #include "avformat.h"
27 #include "internal.h"
28 #include "apetag.h"
29 
30 /* The earliest and latest file formats supported by this library */
31 #define APE_MIN_VERSION 3800
32 #define APE_MAX_VERSION 3990
33 
34 #define MAC_FORMAT_FLAG_8_BIT 1 // is 8-bit [OBSOLETE]
35 #define MAC_FORMAT_FLAG_CRC 2 // uses the new CRC32 error detection [OBSOLETE]
36 #define MAC_FORMAT_FLAG_HAS_PEAK_LEVEL 4 // uint32 nPeakLevel after the header [OBSOLETE]
37 #define MAC_FORMAT_FLAG_24_BIT 8 // is 24-bit [OBSOLETE]
38 #define MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS 16 // has the number of seek elements after the peak level
39 #define MAC_FORMAT_FLAG_CREATE_WAV_HEADER 32 // create the wave header on decompression (not stored)
40 
41 #define APE_EXTRADATA_SIZE 6
42 
43 typedef struct APEFrame {
44  int64_t pos;
45  int nblocks;
46  int size;
47  int skip;
48  int64_t pts;
49 } APEFrame;
50 
51 typedef struct APEContext {
52  /* Derived fields */
53  uint32_t junklength;
54  uint32_t firstframe;
55  uint32_t totalsamples;
58 
59  /* Info from Descriptor Block */
60  int16_t fileversion;
61  int16_t padding1;
62  uint32_t descriptorlength;
63  uint32_t headerlength;
64  uint32_t seektablelength;
65  uint32_t wavheaderlength;
66  uint32_t audiodatalength;
68  uint32_t wavtaillength;
69  uint8_t md5[16];
70 
71  /* Info from Header Block */
72  uint16_t compressiontype;
73  uint16_t formatflags;
74  uint32_t blocksperframe;
75  uint32_t finalframeblocks;
76  uint32_t totalframes;
77  uint16_t bps;
78  uint16_t channels;
79  uint32_t samplerate;
80 } APEContext;
81 
82 static int ape_read_close(AVFormatContext * s);
83 
84 static int ape_probe(const AVProbeData * p)
85 {
86  int version = AV_RL16(p->buf+4);
87  if (AV_RL32(p->buf) != MKTAG('M', 'A', 'C', ' '))
88  return 0;
89 
90  if (version < APE_MIN_VERSION || version > APE_MAX_VERSION)
91  return AVPROBE_SCORE_MAX/4;
92 
93  return AVPROBE_SCORE_MAX;
94 }
95 
96 static void ape_dumpinfo(AVFormatContext * s, APEContext * ape_ctx)
97 {
98 #ifdef DEBUG
99  int i;
100 
101  av_log(s, AV_LOG_DEBUG, "Descriptor Block:\n\n");
102  av_log(s, AV_LOG_DEBUG, "fileversion = %"PRId16"\n", ape_ctx->fileversion);
103  av_log(s, AV_LOG_DEBUG, "descriptorlength = %"PRIu32"\n", ape_ctx->descriptorlength);
104  av_log(s, AV_LOG_DEBUG, "headerlength = %"PRIu32"\n", ape_ctx->headerlength);
105  av_log(s, AV_LOG_DEBUG, "seektablelength = %"PRIu32"\n", ape_ctx->seektablelength);
106  av_log(s, AV_LOG_DEBUG, "wavheaderlength = %"PRIu32"\n", ape_ctx->wavheaderlength);
107  av_log(s, AV_LOG_DEBUG, "audiodatalength = %"PRIu32"\n", ape_ctx->audiodatalength);
108  av_log(s, AV_LOG_DEBUG, "audiodatalength_high = %"PRIu32"\n", ape_ctx->audiodatalength_high);
109  av_log(s, AV_LOG_DEBUG, "wavtaillength = %"PRIu32"\n", ape_ctx->wavtaillength);
110  av_log(s, AV_LOG_DEBUG, "md5 = ");
111  for (i = 0; i < 16; i++)
112  av_log(s, AV_LOG_DEBUG, "%02x", ape_ctx->md5[i]);
113  av_log(s, AV_LOG_DEBUG, "\n");
114 
115  av_log(s, AV_LOG_DEBUG, "\nHeader Block:\n\n");
116 
117  av_log(s, AV_LOG_DEBUG, "compressiontype = %"PRIu16"\n", ape_ctx->compressiontype);
118  av_log(s, AV_LOG_DEBUG, "formatflags = %"PRIu16"\n", ape_ctx->formatflags);
119  av_log(s, AV_LOG_DEBUG, "blocksperframe = %"PRIu32"\n", ape_ctx->blocksperframe);
120  av_log(s, AV_LOG_DEBUG, "finalframeblocks = %"PRIu32"\n", ape_ctx->finalframeblocks);
121  av_log(s, AV_LOG_DEBUG, "totalframes = %"PRIu32"\n", ape_ctx->totalframes);
122  av_log(s, AV_LOG_DEBUG, "bps = %"PRIu16"\n", ape_ctx->bps);
123  av_log(s, AV_LOG_DEBUG, "channels = %"PRIu16"\n", ape_ctx->channels);
124  av_log(s, AV_LOG_DEBUG, "samplerate = %"PRIu32"\n", ape_ctx->samplerate);
125 
126  av_log(s, AV_LOG_DEBUG, "\nSeektable\n\n");
127  if ((ape_ctx->seektablelength / sizeof(uint32_t)) != ape_ctx->totalframes) {
128  av_log(s, AV_LOG_DEBUG, "No seektable\n");
129  }
130 
131  av_log(s, AV_LOG_DEBUG, "\nFrames\n\n");
132  for (i = 0; i < ape_ctx->totalframes; i++)
133  av_log(s, AV_LOG_DEBUG, "%8d %8"PRId64" %8d (%d samples)\n", i,
134  ape_ctx->frames[i].pos, ape_ctx->frames[i].size,
135  ape_ctx->frames[i].nblocks);
136 
137  av_log(s, AV_LOG_DEBUG, "\nCalculated information:\n\n");
138  av_log(s, AV_LOG_DEBUG, "junklength = %"PRIu32"\n", ape_ctx->junklength);
139  av_log(s, AV_LOG_DEBUG, "firstframe = %"PRIu32"\n", ape_ctx->firstframe);
140  av_log(s, AV_LOG_DEBUG, "totalsamples = %"PRIu32"\n", ape_ctx->totalsamples);
141 #endif
142 }
143 
145 {
146  AVIOContext *pb = s->pb;
147  APEContext *ape = s->priv_data;
148  AVStream *st;
149  uint32_t tag;
150  int i, ret;
151  int total_blocks, final_size = 0;
152  int64_t pts, file_size;
153 
154  /* Skip any leading junk such as id3v2 tags */
155  ape->junklength = avio_tell(pb);
156 
157  tag = avio_rl32(pb);
158  if (tag != MKTAG('M', 'A', 'C', ' '))
159  return AVERROR_INVALIDDATA;
160 
161  ape->fileversion = avio_rl16(pb);
162 
164  av_log(s, AV_LOG_ERROR, "Unsupported file version - %d.%02d\n",
165  ape->fileversion / 1000, (ape->fileversion % 1000) / 10);
166  return AVERROR_PATCHWELCOME;
167  }
168 
169  if (ape->fileversion >= 3980) {
170  ape->padding1 = avio_rl16(pb);
171  ape->descriptorlength = avio_rl32(pb);
172  ape->headerlength = avio_rl32(pb);
173  ape->seektablelength = avio_rl32(pb);
174  ape->wavheaderlength = avio_rl32(pb);
175  ape->audiodatalength = avio_rl32(pb);
176  ape->audiodatalength_high = avio_rl32(pb);
177  ape->wavtaillength = avio_rl32(pb);
178  avio_read(pb, ape->md5, 16);
179 
180  /* Skip any unknown bytes at the end of the descriptor.
181  This is for future compatibility */
182  if (ape->descriptorlength > 52)
183  avio_skip(pb, ape->descriptorlength - 52);
184 
185  /* Read header data */
186  ape->compressiontype = avio_rl16(pb);
187  ape->formatflags = avio_rl16(pb);
188  ape->blocksperframe = avio_rl32(pb);
189  ape->finalframeblocks = avio_rl32(pb);
190  ape->totalframes = avio_rl32(pb);
191  ape->bps = avio_rl16(pb);
192  ape->channels = avio_rl16(pb);
193  ape->samplerate = avio_rl32(pb);
194  } else {
195  ape->descriptorlength = 0;
196  ape->headerlength = 32;
197 
198  ape->compressiontype = avio_rl16(pb);
199  ape->formatflags = avio_rl16(pb);
200  ape->channels = avio_rl16(pb);
201  ape->samplerate = avio_rl32(pb);
202  ape->wavheaderlength = avio_rl32(pb);
203  ape->wavtaillength = avio_rl32(pb);
204  ape->totalframes = avio_rl32(pb);
205  ape->finalframeblocks = avio_rl32(pb);
206 
208  avio_skip(pb, 4); /* Skip the peak level */
209  ape->headerlength += 4;
210  }
211 
213  ape->seektablelength = avio_rl32(pb);
214  ape->headerlength += 4;
215  ape->seektablelength *= sizeof(int32_t);
216  } else
217  ape->seektablelength = ape->totalframes * sizeof(int32_t);
218 
220  ape->bps = 8;
221  else if (ape->formatflags & MAC_FORMAT_FLAG_24_BIT)
222  ape->bps = 24;
223  else
224  ape->bps = 16;
225 
226  if (ape->fileversion >= 3950)
227  ape->blocksperframe = 73728 * 4;
228  else if (ape->fileversion >= 3900 || (ape->fileversion >= 3800 && ape->compressiontype >= 4000))
229  ape->blocksperframe = 73728;
230  else
231  ape->blocksperframe = 9216;
232 
233  /* Skip any stored wav header */
235  avio_skip(pb, ape->wavheaderlength);
236  }
237 
238  if(!ape->totalframes || pb->eof_reached){
239  av_log(s, AV_LOG_ERROR, "No frames in the file!\n");
240  return AVERROR(EINVAL);
241  }
242  if(ape->totalframes > UINT_MAX / sizeof(APEFrame)){
243  av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n",
244  ape->totalframes);
245  return AVERROR_INVALIDDATA;
246  }
247  if (ape->seektablelength / sizeof(uint32_t) < ape->totalframes) {
249  "Number of seek entries is less than number of frames: %"SIZE_SPECIFIER" vs. %"PRIu32"\n",
250  ape->seektablelength / sizeof(uint32_t), ape->totalframes);
251  return AVERROR_INVALIDDATA;
252  }
253  ape->frames = av_malloc_array(ape->totalframes, sizeof(APEFrame));
254  if(!ape->frames)
255  return AVERROR(ENOMEM);
256  ape->firstframe = ape->junklength + ape->descriptorlength + ape->headerlength + ape->seektablelength + ape->wavheaderlength;
257  if (ape->fileversion < 3810)
258  ape->firstframe += ape->totalframes;
259  ape->currentframe = 0;
260 
261 
262  ape->totalsamples = ape->finalframeblocks;
263  if (ape->totalframes > 1)
264  ape->totalsamples += ape->blocksperframe * (ape->totalframes - 1);
265 
266  ape->frames[0].pos = ape->firstframe;
267  ape->frames[0].nblocks = ape->blocksperframe;
268  ape->frames[0].skip = 0;
269  avio_rl32(pb); // seektable[0]
270  for (i = 1; i < ape->totalframes; i++) {
271  uint32_t seektable_entry = avio_rl32(pb);
272  ape->frames[i].pos = seektable_entry + ape->junklength;
273  ape->frames[i].nblocks = ape->blocksperframe;
274  ape->frames[i - 1].size = ape->frames[i].pos - ape->frames[i - 1].pos;
275  ape->frames[i].skip = (ape->frames[i].pos - ape->frames[0].pos) & 3;
276 
277  if (pb->eof_reached) {
278  av_log(s, AV_LOG_ERROR, "seektable truncated\n");
279  ret = AVERROR_INVALIDDATA;
280  goto fail;
281  }
282  ff_dlog(s, "seektable: %8d %"PRIu32"\n", i, seektable_entry);
283  }
284  avio_skip(pb, ape->seektablelength / sizeof(uint32_t) - ape->totalframes);
285 
286  ape->frames[ape->totalframes - 1].nblocks = ape->finalframeblocks;
287  /* calculate final packet size from total file size, if available */
288  file_size = avio_size(pb);
289  if (file_size > 0) {
290  final_size = file_size - ape->frames[ape->totalframes - 1].pos -
291  ape->wavtaillength;
292  final_size -= final_size & 3;
293  }
294  if (file_size <= 0 || final_size <= 0)
295  final_size = ape->finalframeblocks * 8;
296  ape->frames[ape->totalframes - 1].size = final_size;
297 
298  for (i = 0; i < ape->totalframes; i++) {
299  if(ape->frames[i].skip){
300  ape->frames[i].pos -= ape->frames[i].skip;
301  ape->frames[i].size += ape->frames[i].skip;
302  }
303  ape->frames[i].size = (ape->frames[i].size + 3) & ~3;
304  }
305  if (ape->fileversion < 3810) {
306  for (i = 0; i < ape->totalframes; i++) {
307  int bits = avio_r8(pb);
308  if (i && bits)
309  ape->frames[i - 1].size += 4;
310 
311  ape->frames[i].skip <<= 3;
312  ape->frames[i].skip += bits;
313  ff_dlog(s, "bittable: %2d\n", bits);
314  if (pb->eof_reached) {
315  av_log(s, AV_LOG_ERROR, "bittable truncated\n");
316  ret = AVERROR_INVALIDDATA;
317  goto fail;
318  }
319  }
320  }
321 
322  ape_dumpinfo(s, ape);
323 
324  av_log(s, AV_LOG_VERBOSE, "Decoding file - v%d.%02d, compression level %"PRIu16"\n",
325  ape->fileversion / 1000, (ape->fileversion % 1000) / 10,
326  ape->compressiontype);
327 
328  /* now we are ready: build format streams */
329  st = avformat_new_stream(s, NULL);
330  if (!st) {
331  ret = AVERROR(ENOMEM);
332  goto fail;
333  }
334 
335  total_blocks = (ape->totalframes == 0) ? 0 : ((ape->totalframes - 1) * ape->blocksperframe) + ape->finalframeblocks;
336 
339  st->codecpar->codec_tag = MKTAG('A', 'P', 'E', ' ');
340  st->codecpar->channels = ape->channels;
341  st->codecpar->sample_rate = ape->samplerate;
342  st->codecpar->bits_per_coded_sample = ape->bps;
343 
344  st->nb_frames = ape->totalframes;
345  st->start_time = 0;
346  st->duration = total_blocks;
347  avpriv_set_pts_info(st, 64, 1, ape->samplerate);
348 
349  if ((ret = ff_alloc_extradata(st->codecpar, APE_EXTRADATA_SIZE)) < 0)
350  goto fail;
351  AV_WL16(st->codecpar->extradata + 0, ape->fileversion);
352  AV_WL16(st->codecpar->extradata + 2, ape->compressiontype);
353  AV_WL16(st->codecpar->extradata + 4, ape->formatflags);
354 
355  pts = 0;
356  for (i = 0; i < ape->totalframes; i++) {
357  ape->frames[i].pts = pts;
358  av_add_index_entry(st, ape->frames[i].pos, ape->frames[i].pts, 0, 0, AVINDEX_KEYFRAME);
359  pts += ape->blocksperframe;
360  }
361 
362  /* try to read APE tags */
363  if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
365  avio_seek(pb, 0, SEEK_SET);
366  }
367 
368  return 0;
369 fail:
370  ape_read_close(s);
371 
372  return ret;
373 }
374 
376 {
377  int ret;
378  int nblocks;
379  APEContext *ape = s->priv_data;
380  uint32_t extra_size = 8;
381  int64_t ret64;
382 
383  if (avio_feof(s->pb))
384  return AVERROR_EOF;
385  if (ape->currentframe >= ape->totalframes)
386  return AVERROR_EOF;
387 
388  ret64 = avio_seek(s->pb, ape->frames[ape->currentframe].pos, SEEK_SET);
389  if (ret64 < 0)
390  return ret64;
391 
392  /* Calculate how many blocks there are in this frame */
393  if (ape->currentframe == (ape->totalframes - 1))
394  nblocks = ape->finalframeblocks;
395  else
396  nblocks = ape->blocksperframe;
397 
398  if (ape->frames[ape->currentframe].size <= 0 ||
399  ape->frames[ape->currentframe].size > INT_MAX - extra_size) {
400  av_log(s, AV_LOG_ERROR, "invalid packet size: %d\n",
401  ape->frames[ape->currentframe].size);
402  ape->currentframe++;
403  return AVERROR(EIO);
404  }
405 
406  ret = av_new_packet(pkt, ape->frames[ape->currentframe].size + extra_size);
407  if (ret < 0)
408  return ret;
409 
410  AV_WL32(pkt->data , nblocks);
411  AV_WL32(pkt->data + 4, ape->frames[ape->currentframe].skip);
412  ret = avio_read(s->pb, pkt->data + extra_size, ape->frames[ape->currentframe].size);
413  if (ret < 0) {
414  return ret;
415  }
416 
417  pkt->pts = ape->frames[ape->currentframe].pts;
418  pkt->stream_index = 0;
419 
420  /* note: we need to modify the packet size here to handle the last
421  packet */
422  pkt->size = ret + extra_size;
423 
424  ape->currentframe++;
425 
426  return 0;
427 }
428 
430 {
431  APEContext *ape = s->priv_data;
432 
433  av_freep(&ape->frames);
434  return 0;
435 }
436 
437 static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
438 {
439  AVStream *st = s->streams[stream_index];
440  APEContext *ape = s->priv_data;
441  int index = av_index_search_timestamp(st, timestamp, flags);
442  int64_t ret;
443 
444  if (index < 0)
445  return -1;
446 
447  if ((ret = avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET)) < 0)
448  return ret;
449  ape->currentframe = index;
450  return 0;
451 }
452 
454  .name = "ape",
455  .long_name = NULL_IF_CONFIG_SMALL("Monkey's Audio"),
456  .priv_data_size = sizeof(APEContext),
462  .extensions = "ape,apl,mac",
463 };
#define MAC_FORMAT_FLAG_8_BIT
Definition: ape.c:34
#define MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS
Definition: ape.c:38
AVInputFormat ff_ape_demuxer
Definition: ape.c:453
#define MAC_FORMAT_FLAG_24_BIT
Definition: ape.c:37
#define APE_EXTRADATA_SIZE
Definition: ape.c:41
static int ape_probe(const AVProbeData *p)
Definition: ape.c:84
#define MAC_FORMAT_FLAG_CREATE_WAV_HEADER
Definition: ape.c:39
static int ape_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: ape.c:375
static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: ape.c:437
static void ape_dumpinfo(AVFormatContext *s, APEContext *ape_ctx)
Definition: ape.c:96
static int ape_read_header(AVFormatContext *s)
Definition: ape.c:144
#define APE_MAX_VERSION
Definition: ape.c:32
#define MAC_FORMAT_FLAG_HAS_PEAK_LEVEL
Definition: ape.c:36
#define APE_MIN_VERSION
Definition: ape.c:31
static int ape_read_close(AVFormatContext *s)
Definition: ape.c:429
int64_t ff_ape_parse_tag(AVFormatContext *s)
Read and parse an APE tag.
Definition: apetag.c:118
uint8_t
int32_t
Main libavformat public API header.
#define AVINDEX_KEYFRAME
Definition: avformat.h:811
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:342
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:364
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:734
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:633
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:750
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:624
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
#define AV_RL16
Definition: intreadwrite.h:42
#define AV_RL32
Definition: intreadwrite.h:146
#define flags(name, subs,...)
Definition: cbs_av1.c:561
#define s(width, name)
Definition: cbs_vp9.c:257
#define fail()
Definition: checkasm.h:133
#define MKTAG(a, b, c, d)
Definition: common.h:478
#define NULL
Definition: coverity.c:32
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
@ AV_CODEC_ID_APE
Definition: codec_id.h:456
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:99
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4505
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
Add an index entry into a sorted list.
Definition: utils.c:2011
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2128
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define AVERROR(e)
Definition: error.h:43
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:215
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:210
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
int index
Definition: gxfenc.c:89
int i
Definition: input.c:407
#define AV_WL32(p, v)
Definition: intreadwrite.h:426
#define AV_WL16(p, v)
Definition: intreadwrite.h:412
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4941
int ff_alloc_extradata(AVCodecParameters *par, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0.
Definition: utils.c:3312
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
common internal API header
#define SIZE_SPECIFIER
Definition: internal.h:193
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
version
Definition: libkvazaar.c:320
uint32_t tag
Definition: movenc.c:1600
Decoder context.
Definition: apedec.c:152
uint32_t junklength
Definition: ape.c:53
uint32_t totalframes
Definition: ape.c:76
uint32_t descriptorlength
Definition: ape.c:62
uint16_t bps
Definition: ape.c:77
uint16_t formatflags
Definition: ape.c:73
int channels
Definition: apedec.c:157
uint8_t md5[16]
Definition: ape.c:69
uint32_t samplerate
Definition: ape.c:79
int fileversion
codec version, very important in decoding process
Definition: apedec.c:161
uint32_t wavtaillength
Definition: ape.c:68
uint32_t headerlength
Definition: ape.c:63
uint32_t audiodatalength_high
Definition: ape.c:67
uint16_t channels
Definition: ape.c:78
uint32_t firstframe
Definition: ape.c:54
uint32_t totalsamples
Definition: ape.c:55
int currentframe
Definition: ape.c:56
uint32_t seektablelength
Definition: ape.c:64
uint32_t audiodatalength
Definition: ape.c:66
APEFrame * frames
Definition: ape.c:57
uint32_t finalframeblocks
Definition: ape.c:75
uint32_t wavheaderlength
Definition: ape.c:65
int bps
Definition: apedec.c:159
uint16_t compressiontype
Definition: ape.c:72
int16_t padding1
Definition: ape.c:61
uint32_t blocksperframe
Definition: ape.c:74
int16_t fileversion
Definition: ape.c:60
Definition: ape.c:43
int64_t pts
Definition: ape.c:48
int skip
Definition: ape.c:47
int nblocks
Definition: ape.c:45
int64_t pos
Definition: ape.c:44
int size
Definition: ape.c:46
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
int channels
Audio only.
Definition: codec_par.h:166
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int sample_rate
Audio only.
Definition: codec_par.h:170
Format I/O context.
Definition: avformat.h:1232
Bytestream IO Context.
Definition: avio.h:161
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
int eof_reached
true if was unable to read due to error or eof
Definition: avio.h:239
int64_t pos
Definition: avformat.h:804
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
This structure stores compressed data.
Definition: packet.h:346
int stream_index
Definition: packet.h:371
int size
Definition: packet.h:370
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:362
uint8_t * data
Definition: packet.h:369
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
Stream structure.
Definition: avformat.h:873
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:924
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:922
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base.
Definition: avformat.h:912
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1090
#define av_malloc_array(a, b)
#define ff_dlog(a,...)
#define av_freep(p)
#define av_log(a,...)
AVPacket * pkt
Definition: movenc.c:59
static int64_t pts
if(ret< 0)
Definition: vf_mcdeint.c:282
uint8_t bits
Definition: vp3data.h:141