FFmpeg  4.4
vfwcap.c
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1 /*
2  * VFW capture interface
3  * Copyright (c) 2006-2008 Ramiro Polla
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/internal.h"
23 #include "libavutil/log.h"
24 #include "libavutil/opt.h"
25 #include "libavutil/parseutils.h"
26 
28 #include "libavformat/internal.h"
29 
30 // windows.h must no be included before winsock2.h, and libavformat internal
31 // headers may include winsock2.h
32 #include <windows.h>
33 // windows.h needs to be included before vfw.h
34 #include <vfw.h>
35 
36 #include "avdevice.h"
37 
38 /* Some obsolete versions of MinGW32 before 4.0.0 lack this. */
39 #ifndef HWND_MESSAGE
40 #define HWND_MESSAGE ((HWND) -3)
41 #endif
42 
43 struct vfw_ctx {
44  const AVClass *class;
45  HWND hwnd;
46  HANDLE mutex;
47  HANDLE event;
49  unsigned int curbufsize;
50  unsigned int frame_num;
51  char *video_size; /**< A string describing video size, set by a private option. */
52  char *framerate; /**< Set by a private option. */
53 };
54 
55 static enum AVPixelFormat vfw_pixfmt(DWORD biCompression, WORD biBitCount)
56 {
57  switch(biCompression) {
58  case MKTAG('U', 'Y', 'V', 'Y'):
59  return AV_PIX_FMT_UYVY422;
60  case MKTAG('Y', 'U', 'Y', '2'):
61  return AV_PIX_FMT_YUYV422;
62  case MKTAG('I', '4', '2', '0'):
63  return AV_PIX_FMT_YUV420P;
64  case BI_RGB:
65  switch(biBitCount) { /* 1-8 are untested */
66  case 1:
67  return AV_PIX_FMT_MONOWHITE;
68  case 4:
69  return AV_PIX_FMT_RGB4;
70  case 8:
71  return AV_PIX_FMT_RGB8;
72  case 16:
73  return AV_PIX_FMT_RGB555;
74  case 24:
75  return AV_PIX_FMT_BGR24;
76  case 32:
77  return AV_PIX_FMT_RGB32;
78  }
79  }
80  return AV_PIX_FMT_NONE;
81 }
82 
83 static enum AVCodecID vfw_codecid(DWORD biCompression)
84 {
85  switch(biCompression) {
86  case MKTAG('d', 'v', 's', 'd'):
88  case MKTAG('M', 'J', 'P', 'G'):
89  case MKTAG('m', 'j', 'p', 'g'):
91  }
92  return AV_CODEC_ID_NONE;
93 }
94 
95 #define dstruct(pctx, sname, var, type) \
96  av_log(pctx, AV_LOG_DEBUG, #var":\t%"type"\n", sname->var)
97 
98 static void dump_captureparms(AVFormatContext *s, CAPTUREPARMS *cparms)
99 {
100  av_log(s, AV_LOG_DEBUG, "CAPTUREPARMS\n");
101  dstruct(s, cparms, dwRequestMicroSecPerFrame, "lu");
102  dstruct(s, cparms, fMakeUserHitOKToCapture, "d");
103  dstruct(s, cparms, wPercentDropForError, "u");
104  dstruct(s, cparms, fYield, "d");
105  dstruct(s, cparms, dwIndexSize, "lu");
106  dstruct(s, cparms, wChunkGranularity, "u");
107  dstruct(s, cparms, fUsingDOSMemory, "d");
108  dstruct(s, cparms, wNumVideoRequested, "u");
109  dstruct(s, cparms, fCaptureAudio, "d");
110  dstruct(s, cparms, wNumAudioRequested, "u");
111  dstruct(s, cparms, vKeyAbort, "u");
112  dstruct(s, cparms, fAbortLeftMouse, "d");
113  dstruct(s, cparms, fAbortRightMouse, "d");
114  dstruct(s, cparms, fLimitEnabled, "d");
115  dstruct(s, cparms, wTimeLimit, "u");
116  dstruct(s, cparms, fMCIControl, "d");
117  dstruct(s, cparms, fStepMCIDevice, "d");
118  dstruct(s, cparms, dwMCIStartTime, "lu");
119  dstruct(s, cparms, dwMCIStopTime, "lu");
120  dstruct(s, cparms, fStepCaptureAt2x, "d");
121  dstruct(s, cparms, wStepCaptureAverageFrames, "u");
122  dstruct(s, cparms, dwAudioBufferSize, "lu");
123  dstruct(s, cparms, fDisableWriteCache, "d");
124  dstruct(s, cparms, AVStreamMaster, "u");
125 }
126 
127 static void dump_videohdr(AVFormatContext *s, VIDEOHDR *vhdr)
128 {
129 #ifdef DEBUG
130  av_log(s, AV_LOG_DEBUG, "VIDEOHDR\n");
131  dstruct(s, vhdr, lpData, "p");
132  dstruct(s, vhdr, dwBufferLength, "lu");
133  dstruct(s, vhdr, dwBytesUsed, "lu");
134  dstruct(s, vhdr, dwTimeCaptured, "lu");
135  dstruct(s, vhdr, dwUser, "lu");
136  dstruct(s, vhdr, dwFlags, "lu");
137  dstruct(s, vhdr, dwReserved[0], "lu");
138  dstruct(s, vhdr, dwReserved[1], "lu");
139  dstruct(s, vhdr, dwReserved[2], "lu");
140  dstruct(s, vhdr, dwReserved[3], "lu");
141 #endif
142 }
143 
144 static void dump_bih(AVFormatContext *s, BITMAPINFOHEADER *bih)
145 {
146  av_log(s, AV_LOG_DEBUG, "BITMAPINFOHEADER\n");
147  dstruct(s, bih, biSize, "lu");
148  dstruct(s, bih, biWidth, "ld");
149  dstruct(s, bih, biHeight, "ld");
150  dstruct(s, bih, biPlanes, "d");
151  dstruct(s, bih, biBitCount, "d");
152  dstruct(s, bih, biCompression, "lu");
153  av_log(s, AV_LOG_DEBUG, " biCompression:\t\"%.4s\"\n",
154  (char*) &bih->biCompression);
155  dstruct(s, bih, biSizeImage, "lu");
156  dstruct(s, bih, biXPelsPerMeter, "lu");
157  dstruct(s, bih, biYPelsPerMeter, "lu");
158  dstruct(s, bih, biClrUsed, "lu");
159  dstruct(s, bih, biClrImportant, "lu");
160 }
161 
163 {
164  struct vfw_ctx *ctx = s->priv_data;
165  static const uint8_t dropscore[4] = { 62, 75, 87, 100 };
166  const int ndropscores = FF_ARRAY_ELEMS(dropscore);
167  unsigned int buffer_fullness = (ctx->curbufsize*100)/s->max_picture_buffer;
168 
169  if(dropscore[++ctx->frame_num%ndropscores] <= buffer_fullness) {
171  "real-time buffer %d%% full! frame dropped!\n", buffer_fullness);
172  return 1;
173  }
174 
175  return 0;
176 }
177 
178 static LRESULT CALLBACK videostream_cb(HWND hwnd, LPVIDEOHDR vdhdr)
179 {
181  struct vfw_ctx *ctx;
182  PacketList **ppktl, *pktl_next;
183 
184  s = (AVFormatContext *) GetWindowLongPtr(hwnd, GWLP_USERDATA);
185  ctx = s->priv_data;
186 
187  dump_videohdr(s, vdhdr);
188 
189  if(shall_we_drop(s))
190  return FALSE;
191 
192  WaitForSingleObject(ctx->mutex, INFINITE);
193 
194  pktl_next = av_mallocz(sizeof(PacketList));
195  if(!pktl_next)
196  goto fail;
197 
198  if(av_new_packet(&pktl_next->pkt, vdhdr->dwBytesUsed) < 0) {
199  av_free(pktl_next);
200  goto fail;
201  }
202 
203  pktl_next->pkt.pts = vdhdr->dwTimeCaptured;
204  memcpy(pktl_next->pkt.data, vdhdr->lpData, vdhdr->dwBytesUsed);
205 
206  for(ppktl = &ctx->pktl ; *ppktl ; ppktl = &(*ppktl)->next);
207  *ppktl = pktl_next;
208 
209  ctx->curbufsize += vdhdr->dwBytesUsed;
210 
211  SetEvent(ctx->event);
212  ReleaseMutex(ctx->mutex);
213 
214  return TRUE;
215 fail:
216  ReleaseMutex(ctx->mutex);
217  return FALSE;
218 }
219 
221 {
222  struct vfw_ctx *ctx = s->priv_data;
223  PacketList *pktl;
224 
225  if(ctx->hwnd) {
226  SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
227  SendMessage(ctx->hwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0);
228  DestroyWindow(ctx->hwnd);
229  }
230  if(ctx->mutex)
231  CloseHandle(ctx->mutex);
232  if(ctx->event)
233  CloseHandle(ctx->event);
234 
235  pktl = ctx->pktl;
236  while (pktl) {
237  PacketList *next = pktl->next;
239  av_free(pktl);
240  pktl = next;
241  }
242 
243  return 0;
244 }
245 
247 {
248  struct vfw_ctx *ctx = s->priv_data;
249  AVCodecParameters *par;
250  AVStream *st;
251  int devnum;
252  int bisize;
253  BITMAPINFO *bi = NULL;
254  CAPTUREPARMS cparms;
255  DWORD biCompression;
256  WORD biBitCount;
257  int ret;
258  AVRational framerate_q;
259 
260  if (!strcmp(s->url, "list")) {
261  for (devnum = 0; devnum <= 9; devnum++) {
262  char driver_name[256];
263  char driver_ver[256];
264  ret = capGetDriverDescription(devnum,
265  driver_name, sizeof(driver_name),
266  driver_ver, sizeof(driver_ver));
267  if (ret) {
268  av_log(s, AV_LOG_INFO, "Driver %d\n", devnum);
269  av_log(s, AV_LOG_INFO, " %s\n", driver_name);
270  av_log(s, AV_LOG_INFO, " %s\n", driver_ver);
271  }
272  }
273  return AVERROR(EIO);
274  }
275 
276  ctx->hwnd = capCreateCaptureWindow(NULL, 0, 0, 0, 0, 0, HWND_MESSAGE, 0);
277  if(!ctx->hwnd) {
278  av_log(s, AV_LOG_ERROR, "Could not create capture window.\n");
279  return AVERROR(EIO);
280  }
281 
282  /* If atoi fails, devnum==0 and the default device is used */
283  devnum = atoi(s->url);
284 
285  ret = SendMessage(ctx->hwnd, WM_CAP_DRIVER_CONNECT, devnum, 0);
286  if(!ret) {
287  av_log(s, AV_LOG_ERROR, "Could not connect to device.\n");
288  DestroyWindow(ctx->hwnd);
289  return AVERROR(ENODEV);
290  }
291 
292  SendMessage(ctx->hwnd, WM_CAP_SET_OVERLAY, 0, 0);
293  SendMessage(ctx->hwnd, WM_CAP_SET_PREVIEW, 0, 0);
294 
295  ret = SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0,
296  (LPARAM) videostream_cb);
297  if(!ret) {
298  av_log(s, AV_LOG_ERROR, "Could not set video stream callback.\n");
299  goto fail;
300  }
301 
302  SetWindowLongPtr(ctx->hwnd, GWLP_USERDATA, (LONG_PTR) s);
303 
304  st = avformat_new_stream(s, NULL);
305  if(!st) {
306  vfw_read_close(s);
307  return AVERROR(ENOMEM);
308  }
309 
310  /* Set video format */
311  bisize = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, 0, 0);
312  if(!bisize)
313  goto fail;
314  bi = av_malloc(bisize);
315  if(!bi) {
316  vfw_read_close(s);
317  return AVERROR(ENOMEM);
318  }
319  ret = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, bisize, (LPARAM) bi);
320  if(!ret)
321  goto fail;
322 
323  dump_bih(s, &bi->bmiHeader);
324 
325  ret = av_parse_video_rate(&framerate_q, ctx->framerate);
326  if (ret < 0) {
327  av_log(s, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", ctx->framerate);
328  goto fail;
329  }
330 
331  if (ctx->video_size) {
332  int w, h;
333  ret = av_parse_video_size(&w, &h, ctx->video_size);
334  if (ret < 0) {
335  av_log(s, AV_LOG_ERROR, "Couldn't parse video size.\n");
336  goto fail;
337  }
338  bi->bmiHeader.biWidth = w;
339  bi->bmiHeader.biHeight = h;
340  }
341 
342  if (0) {
343  /* For testing yet unsupported compressions
344  * Copy these values from user-supplied verbose information */
345  bi->bmiHeader.biWidth = 320;
346  bi->bmiHeader.biHeight = 240;
347  bi->bmiHeader.biPlanes = 1;
348  bi->bmiHeader.biBitCount = 12;
349  bi->bmiHeader.biCompression = MKTAG('I','4','2','0');
350  bi->bmiHeader.biSizeImage = 115200;
351  dump_bih(s, &bi->bmiHeader);
352  }
353 
354  ret = SendMessage(ctx->hwnd, WM_CAP_SET_VIDEOFORMAT, bisize, (LPARAM) bi);
355  if(!ret) {
356  av_log(s, AV_LOG_ERROR, "Could not set Video Format.\n");
357  goto fail;
358  }
359 
360  biCompression = bi->bmiHeader.biCompression;
361  biBitCount = bi->bmiHeader.biBitCount;
362 
363  /* Set sequence setup */
364  ret = SendMessage(ctx->hwnd, WM_CAP_GET_SEQUENCE_SETUP, sizeof(cparms),
365  (LPARAM) &cparms);
366  if(!ret)
367  goto fail;
368 
369  dump_captureparms(s, &cparms);
370 
371  cparms.fYield = 1; // Spawn a background thread
372  cparms.dwRequestMicroSecPerFrame =
373  (framerate_q.den*1000000) / framerate_q.num;
374  cparms.fAbortLeftMouse = 0;
375  cparms.fAbortRightMouse = 0;
376  cparms.fCaptureAudio = 0;
377  cparms.vKeyAbort = 0;
378 
379  ret = SendMessage(ctx->hwnd, WM_CAP_SET_SEQUENCE_SETUP, sizeof(cparms),
380  (LPARAM) &cparms);
381  if(!ret)
382  goto fail;
383 
384  st->avg_frame_rate = framerate_q;
385 
386  par = st->codecpar;
388  par->width = bi->bmiHeader.biWidth;
389  par->height = bi->bmiHeader.biHeight;
390  par->format = vfw_pixfmt(biCompression, biBitCount);
391  if (par->format == AV_PIX_FMT_NONE) {
392  par->codec_id = vfw_codecid(biCompression);
393  if (par->codec_id == AV_CODEC_ID_NONE) {
394  avpriv_report_missing_feature(s, "This compression type");
395  vfw_read_close(s);
396  return AVERROR_PATCHWELCOME;
397  }
398  par->bits_per_coded_sample = biBitCount;
399  } else {
401  if(biCompression == BI_RGB) {
402  par->bits_per_coded_sample = biBitCount;
404  if (par->extradata) {
405  par->extradata_size = 9;
406  memcpy(par->extradata, "BottomUp", 9);
407  }
408  }
409  }
410 
411  av_freep(&bi);
412 
413  avpriv_set_pts_info(st, 32, 1, 1000);
414 
415  ctx->mutex = CreateMutex(NULL, 0, NULL);
416  if(!ctx->mutex) {
417  av_log(s, AV_LOG_ERROR, "Could not create Mutex.\n" );
418  goto fail;
419  }
420  ctx->event = CreateEvent(NULL, 1, 0, NULL);
421  if(!ctx->event) {
422  av_log(s, AV_LOG_ERROR, "Could not create Event.\n" );
423  goto fail;
424  }
425 
426  ret = SendMessage(ctx->hwnd, WM_CAP_SEQUENCE_NOFILE, 0, 0);
427  if(!ret) {
428  av_log(s, AV_LOG_ERROR, "Could not start capture sequence.\n" );
429  goto fail;
430  }
431 
432  return 0;
433 
434 fail:
435  av_freep(&bi);
436  vfw_read_close(s);
437  return AVERROR(EIO);
438 }
439 
441 {
442  struct vfw_ctx *ctx = s->priv_data;
443  PacketList *pktl = NULL;
444 
445  while(!pktl) {
446  WaitForSingleObject(ctx->mutex, INFINITE);
447  pktl = ctx->pktl;
448  if(ctx->pktl) {
449  *pkt = ctx->pktl->pkt;
450  ctx->pktl = ctx->pktl->next;
451  av_free(pktl);
452  }
453  ResetEvent(ctx->event);
454  ReleaseMutex(ctx->mutex);
455  if(!pktl) {
456  if(s->flags & AVFMT_FLAG_NONBLOCK) {
457  return AVERROR(EAGAIN);
458  } else {
459  WaitForSingleObject(ctx->event, INFINITE);
460  }
461  }
462  }
463 
464  ctx->curbufsize -= pkt->size;
465 
466  return pkt->size;
467 }
468 
469 #define OFFSET(x) offsetof(struct vfw_ctx, x)
470 #define DEC AV_OPT_FLAG_DECODING_PARAM
471 static const AVOption options[] = {
472  { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
473  { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = "ntsc"}, 0, 0, DEC },
474  { NULL },
475 };
476 
477 static const AVClass vfw_class = {
478  .class_name = "VFW indev",
479  .item_name = av_default_item_name,
480  .option = options,
481  .version = LIBAVUTIL_VERSION_INT,
483 };
484 
486  .name = "vfwcap",
487  .long_name = NULL_IF_CONFIG_SMALL("VfW video capture"),
488  .priv_data_size = sizeof(struct vfw_ctx),
490  .read_packet = vfw_read_packet,
491  .read_close = vfw_read_close,
492  .flags = AVFMT_NOFILE,
493  .priv_class = &vfw_class,
494 };
return
uint8_t
Main libavdevice API header.
#define AVFMT_FLAG_NONBLOCK
Do not block when reading packets from input.
Definition: avformat.h:1366
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:458
#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_OPT_TYPE_STRING
Definition: opt.h:229
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:46
@ AV_CODEC_ID_RAWVIDEO
Definition: codec_id.h:62
@ AV_CODEC_ID_NONE
Definition: codec_id.h:47
@ AV_CODEC_ID_DVVIDEO
Definition: codec_id.h:73
@ AV_CODEC_ID_MJPEG
Definition: codec_id.h:56
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding.
Definition: avcodec.h:215
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:634
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
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#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_INFO
Standard information.
Definition: log.h:205
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:237
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
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
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
uint8_t w
Definition: llviddspenc.c:39
@ AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT
Definition: log.h:42
AVOptions.
int av_parse_video_size(int *width_ptr, int *height_ptr, const char *str)
Parse str and put in width_ptr and height_ptr the detected values.
Definition: parseutils.c:148
int av_parse_video_rate(AVRational *rate, const char *arg)
Parse str and store the detected values in *rate.
Definition: parseutils.c:179
misc parsing utilities
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
@ AV_PIX_FMT_UYVY422
packed YUV 4:2:2, 16bpp, Cb Y0 Cr Y1
Definition: pixfmt.h:81
@ AV_PIX_FMT_RGB8
packed RGB 3:3:2, 8bpp, (msb)2R 3G 3B(lsb)
Definition: pixfmt.h:86
@ AV_PIX_FMT_YUYV422
packed YUV 4:2:2, 16bpp, Y0 Cb Y1 Cr
Definition: pixfmt.h:67
@ AV_PIX_FMT_BGR24
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:69
@ AV_PIX_FMT_RGB4
packed RGB 1:2:1 bitstream, 4bpp, (msb)1R 2G 1B(lsb), a byte contains two pixels, the first pixel in ...
Definition: pixfmt.h:87
@ AV_PIX_FMT_MONOWHITE
Y , 1bpp, 0 is white, 1 is black, in each byte pixels are ordered from the msb to the lsb.
Definition: pixfmt.h:75
#define AV_PIX_FMT_RGB32
Definition: pixfmt.h:372
#define AV_PIX_FMT_RGB555
Definition: pixfmt.h:387
#define FF_ARRAY_ELEMS(a)
Describe the class of an AVClass context structure.
Definition: log.h:67
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:78
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
int width
Video only.
Definition: codec_par.h:126
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
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
Format I/O context.
Definition: avformat.h:1232
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
AVOption.
Definition: opt.h:248
This structure stores compressed data.
Definition: packet.h:346
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
Rational number (pair of numerator and denominator).
Definition: rational.h:58
int num
Numerator.
Definition: rational.h:59
int den
Denominator.
Definition: rational.h:60
Stream structure.
Definition: avformat.h:873
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:946
struct PacketList * next
AVPacket pkt
Definition: vfwcap.c:43
char * video_size
A string describing video size, set by a private option.
Definition: vfwcap.c:51
HWND hwnd
Definition: vfwcap.c:45
unsigned int frame_num
Definition: vfwcap.c:50
unsigned int curbufsize
Definition: vfwcap.c:49
char * framerate
Set by a private option.
Definition: vfwcap.c:52
HANDLE event
Definition: vfwcap.c:47
PacketList * pktl
Definition: vfwcap.c:48
HANDLE mutex
Definition: vfwcap.c:46
#define av_free(p)
#define av_freep(p)
#define av_malloc(s)
#define av_log(a,...)
int framerate
Definition: h264_levels.c:65
AVPacket * pkt
Definition: movenc.c:59
AVFormatContext * ctx
Definition: movenc.c:48
#define HWND_MESSAGE
Definition: vfwcap.c:40
static void dump_videohdr(AVFormatContext *s, VIDEOHDR *vhdr)
Definition: vfwcap.c:127
static int vfw_read_close(AVFormatContext *s)
Definition: vfwcap.c:220
#define dstruct(pctx, sname, var, type)
Definition: vfwcap.c:95
static LRESULT CALLBACK videostream_cb(HWND hwnd, LPVIDEOHDR vdhdr)
Definition: vfwcap.c:178
static const AVOption options[]
Definition: vfwcap.c:471
AVInputFormat ff_vfwcap_demuxer
Definition: vfwcap.c:485
static int vfw_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: vfwcap.c:440
static enum AVPixelFormat vfw_pixfmt(DWORD biCompression, WORD biBitCount)
Definition: vfwcap.c:55
static void dump_bih(AVFormatContext *s, BITMAPINFOHEADER *bih)
Definition: vfwcap.c:144
static int vfw_read_header(AVFormatContext *s)
Definition: vfwcap.c:246
static void dump_captureparms(AVFormatContext *s, CAPTUREPARMS *cparms)
Definition: vfwcap.c:98
static int shall_we_drop(AVFormatContext *s)
Definition: vfwcap.c:162
static enum AVCodecID vfw_codecid(DWORD biCompression)
Definition: vfwcap.c:83
static const AVClass vfw_class
Definition: vfwcap.c:477
#define OFFSET(x)
Definition: vfwcap.c:469
#define DEC
Definition: vfwcap.c:470
#define WaitForSingleObject(a, b)
Definition: w32pthreads.h:64