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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 
27 #include "libavformat/internal.h"
28 
29 // windows.h must no be included before winsock2.h, and libavformat internal
30 // headers may include winsock2.h
31 #include <windows.h>
32 // windows.h needs to be included before vfw.h
33 #include <vfw.h>
34 
35 #include "avdevice.h"
36 
37 /* Some obsolete versions of MinGW32 before 4.0.0 lack this. */
38 #ifndef HWND_MESSAGE
39 #define HWND_MESSAGE ((HWND) -3)
40 #endif
41 
42 struct vfw_ctx {
43  const AVClass *class;
48  unsigned int curbufsize;
49  unsigned int frame_num;
50  char *video_size; /**< A string describing video size, set by a private option. */
51  char *framerate; /**< Set by a private option. */
52 };
53 
54 static enum AVPixelFormat vfw_pixfmt(DWORD biCompression, WORD biBitCount)
55 {
56  switch(biCompression) {
57  case MKTAG('U', 'Y', 'V', 'Y'):
58  return AV_PIX_FMT_UYVY422;
59  case MKTAG('Y', 'U', 'Y', '2'):
60  return AV_PIX_FMT_YUYV422;
61  case MKTAG('I', '4', '2', '0'):
62  return AV_PIX_FMT_YUV420P;
63  case BI_RGB:
64  switch(biBitCount) { /* 1-8 are untested */
65  case 1:
66  return AV_PIX_FMT_MONOWHITE;
67  case 4:
68  return AV_PIX_FMT_RGB4;
69  case 8:
70  return AV_PIX_FMT_RGB8;
71  case 16:
72  return AV_PIX_FMT_RGB555;
73  case 24:
74  return AV_PIX_FMT_BGR24;
75  case 32:
76  return AV_PIX_FMT_RGB32;
77  }
78  }
79  return AV_PIX_FMT_NONE;
80 }
81 
82 static enum AVCodecID vfw_codecid(DWORD biCompression)
83 {
84  switch(biCompression) {
85  case MKTAG('d', 'v', 's', 'd'):
86  return AV_CODEC_ID_DVVIDEO;
87  case MKTAG('M', 'J', 'P', 'G'):
88  case MKTAG('m', 'j', 'p', 'g'):
89  return AV_CODEC_ID_MJPEG;
90  }
91  return AV_CODEC_ID_NONE;
92 }
93 
94 #define dstruct(pctx, sname, var, type) \
95  av_log(pctx, AV_LOG_DEBUG, #var":\t%"type"\n", sname->var)
96 
97 static void dump_captureparms(AVFormatContext *s, CAPTUREPARMS *cparms)
98 {
99  av_log(s, AV_LOG_DEBUG, "CAPTUREPARMS\n");
100  dstruct(s, cparms, dwRequestMicroSecPerFrame, "lu");
101  dstruct(s, cparms, fMakeUserHitOKToCapture, "d");
102  dstruct(s, cparms, wPercentDropForError, "u");
103  dstruct(s, cparms, fYield, "d");
104  dstruct(s, cparms, dwIndexSize, "lu");
105  dstruct(s, cparms, wChunkGranularity, "u");
106  dstruct(s, cparms, fUsingDOSMemory, "d");
107  dstruct(s, cparms, wNumVideoRequested, "u");
108  dstruct(s, cparms, fCaptureAudio, "d");
109  dstruct(s, cparms, wNumAudioRequested, "u");
110  dstruct(s, cparms, vKeyAbort, "u");
111  dstruct(s, cparms, fAbortLeftMouse, "d");
112  dstruct(s, cparms, fAbortRightMouse, "d");
113  dstruct(s, cparms, fLimitEnabled, "d");
114  dstruct(s, cparms, wTimeLimit, "u");
115  dstruct(s, cparms, fMCIControl, "d");
116  dstruct(s, cparms, fStepMCIDevice, "d");
117  dstruct(s, cparms, dwMCIStartTime, "lu");
118  dstruct(s, cparms, dwMCIStopTime, "lu");
119  dstruct(s, cparms, fStepCaptureAt2x, "d");
120  dstruct(s, cparms, wStepCaptureAverageFrames, "u");
121  dstruct(s, cparms, dwAudioBufferSize, "lu");
122  dstruct(s, cparms, fDisableWriteCache, "d");
123  dstruct(s, cparms, AVStreamMaster, "u");
124 }
125 
126 static void dump_videohdr(AVFormatContext *s, VIDEOHDR *vhdr)
127 {
128 #ifdef DEBUG
129  av_log(s, AV_LOG_DEBUG, "VIDEOHDR\n");
130  dstruct(s, vhdr, lpData, "p");
131  dstruct(s, vhdr, dwBufferLength, "lu");
132  dstruct(s, vhdr, dwBytesUsed, "lu");
133  dstruct(s, vhdr, dwTimeCaptured, "lu");
134  dstruct(s, vhdr, dwUser, "lu");
135  dstruct(s, vhdr, dwFlags, "lu");
136  dstruct(s, vhdr, dwReserved[0], "lu");
137  dstruct(s, vhdr, dwReserved[1], "lu");
138  dstruct(s, vhdr, dwReserved[2], "lu");
139  dstruct(s, vhdr, dwReserved[3], "lu");
140 #endif
141 }
142 
143 static void dump_bih(AVFormatContext *s, BITMAPINFOHEADER *bih)
144 {
145  av_log(s, AV_LOG_DEBUG, "BITMAPINFOHEADER\n");
146  dstruct(s, bih, biSize, "lu");
147  dstruct(s, bih, biWidth, "ld");
148  dstruct(s, bih, biHeight, "ld");
149  dstruct(s, bih, biPlanes, "d");
150  dstruct(s, bih, biBitCount, "d");
151  dstruct(s, bih, biCompression, "lu");
152  av_log(s, AV_LOG_DEBUG, " biCompression:\t\"%.4s\"\n",
153  (char*) &bih->biCompression);
154  dstruct(s, bih, biSizeImage, "lu");
155  dstruct(s, bih, biXPelsPerMeter, "lu");
156  dstruct(s, bih, biYPelsPerMeter, "lu");
157  dstruct(s, bih, biClrUsed, "lu");
158  dstruct(s, bih, biClrImportant, "lu");
159 }
160 
162 {
163  struct vfw_ctx *ctx = s->priv_data;
164  static const uint8_t dropscore[4] = { 62, 75, 87, 100 };
165  const int ndropscores = FF_ARRAY_ELEMS(dropscore);
166  unsigned int buffer_fullness = (ctx->curbufsize*100)/s->max_picture_buffer;
167 
168  if(dropscore[++ctx->frame_num%ndropscores] <= buffer_fullness) {
169  av_log(s, AV_LOG_ERROR,
170  "real-time buffer %d%% full! frame dropped!\n", buffer_fullness);
171  return 1;
172  }
173 
174  return 0;
175 }
176 
177 static LRESULT CALLBACK videostream_cb(HWND hwnd, LPVIDEOHDR vdhdr)
178 {
180  struct vfw_ctx *ctx;
181  AVPacketList **ppktl, *pktl_next;
182 
183  s = (AVFormatContext *) GetWindowLongPtr(hwnd, GWLP_USERDATA);
184  ctx = s->priv_data;
185 
186  dump_videohdr(s, vdhdr);
187 
188  if(shall_we_drop(s))
189  return FALSE;
190 
191  WaitForSingleObject(ctx->mutex, INFINITE);
192 
193  pktl_next = av_mallocz(sizeof(AVPacketList));
194  if(!pktl_next)
195  goto fail;
196 
197  if(av_new_packet(&pktl_next->pkt, vdhdr->dwBytesUsed) < 0) {
198  av_free(pktl_next);
199  goto fail;
200  }
201 
202  pktl_next->pkt.pts = vdhdr->dwTimeCaptured;
203  memcpy(pktl_next->pkt.data, vdhdr->lpData, vdhdr->dwBytesUsed);
204 
205  for(ppktl = &ctx->pktl ; *ppktl ; ppktl = &(*ppktl)->next);
206  *ppktl = pktl_next;
207 
208  ctx->curbufsize += vdhdr->dwBytesUsed;
209 
210  SetEvent(ctx->event);
211  ReleaseMutex(ctx->mutex);
212 
213  return TRUE;
214 fail:
215  ReleaseMutex(ctx->mutex);
216  return FALSE;
217 }
218 
220 {
221  struct vfw_ctx *ctx = s->priv_data;
223 
224  if(ctx->hwnd) {
225  SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
226  SendMessage(ctx->hwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0);
227  DestroyWindow(ctx->hwnd);
228  }
229  if(ctx->mutex)
230  CloseHandle(ctx->mutex);
231  if(ctx->event)
232  CloseHandle(ctx->event);
233 
234  pktl = ctx->pktl;
235  while (pktl) {
236  AVPacketList *next = pktl->next;
237  av_packet_unref(&pktl->pkt);
238  av_free(pktl);
239  pktl = next;
240  }
241 
242  return 0;
243 }
244 
246 {
247  struct vfw_ctx *ctx = s->priv_data;
248  AVCodecParameters *par;
249  AVStream *st;
250  int devnum;
251  int bisize;
252  BITMAPINFO *bi = NULL;
253  CAPTUREPARMS cparms;
254  DWORD biCompression;
255  WORD biBitCount;
256  int ret;
257  AVRational framerate_q;
258 
259  if (!strcmp(s->filename, "list")) {
260  for (devnum = 0; devnum <= 9; devnum++) {
261  char driver_name[256];
262  char driver_ver[256];
263  ret = capGetDriverDescription(devnum,
264  driver_name, sizeof(driver_name),
265  driver_ver, sizeof(driver_ver));
266  if (ret) {
267  av_log(s, AV_LOG_INFO, "Driver %d\n", devnum);
268  av_log(s, AV_LOG_INFO, " %s\n", driver_name);
269  av_log(s, AV_LOG_INFO, " %s\n", driver_ver);
270  }
271  }
272  return AVERROR(EIO);
273  }
274 
275  ctx->hwnd = capCreateCaptureWindow(NULL, 0, 0, 0, 0, 0, HWND_MESSAGE, 0);
276  if(!ctx->hwnd) {
277  av_log(s, AV_LOG_ERROR, "Could not create capture window.\n");
278  return AVERROR(EIO);
279  }
280 
281  /* If atoi fails, devnum==0 and the default device is used */
282  devnum = atoi(s->filename);
283 
284  ret = SendMessage(ctx->hwnd, WM_CAP_DRIVER_CONNECT, devnum, 0);
285  if(!ret) {
286  av_log(s, AV_LOG_ERROR, "Could not connect to device.\n");
287  DestroyWindow(ctx->hwnd);
288  return AVERROR(ENODEV);
289  }
290 
291  SendMessage(ctx->hwnd, WM_CAP_SET_OVERLAY, 0, 0);
292  SendMessage(ctx->hwnd, WM_CAP_SET_PREVIEW, 0, 0);
293 
294  ret = SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0,
295  (LPARAM) videostream_cb);
296  if(!ret) {
297  av_log(s, AV_LOG_ERROR, "Could not set video stream callback.\n");
298  goto fail;
299  }
300 
301  SetWindowLongPtr(ctx->hwnd, GWLP_USERDATA, (LONG_PTR) s);
302 
303  st = avformat_new_stream(s, NULL);
304  if(!st) {
305  vfw_read_close(s);
306  return AVERROR(ENOMEM);
307  }
308 
309  /* Set video format */
310  bisize = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, 0, 0);
311  if(!bisize)
312  goto fail;
313  bi = av_malloc(bisize);
314  if(!bi) {
315  vfw_read_close(s);
316  return AVERROR(ENOMEM);
317  }
318  ret = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, bisize, (LPARAM) bi);
319  if(!ret)
320  goto fail;
321 
322  dump_bih(s, &bi->bmiHeader);
323 
324  ret = av_parse_video_rate(&framerate_q, ctx->framerate);
325  if (ret < 0) {
326  av_log(s, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", ctx->framerate);
327  goto fail;
328  }
329 
330  if (ctx->video_size) {
331  ret = av_parse_video_size(&bi->bmiHeader.biWidth, &bi->bmiHeader.biHeight, ctx->video_size);
332  if (ret < 0) {
333  av_log(s, AV_LOG_ERROR, "Couldn't parse video size.\n");
334  goto fail;
335  }
336  }
337 
338  if (0) {
339  /* For testing yet unsupported compressions
340  * Copy these values from user-supplied verbose information */
341  bi->bmiHeader.biWidth = 320;
342  bi->bmiHeader.biHeight = 240;
343  bi->bmiHeader.biPlanes = 1;
344  bi->bmiHeader.biBitCount = 12;
345  bi->bmiHeader.biCompression = MKTAG('I','4','2','0');
346  bi->bmiHeader.biSizeImage = 115200;
347  dump_bih(s, &bi->bmiHeader);
348  }
349 
350  ret = SendMessage(ctx->hwnd, WM_CAP_SET_VIDEOFORMAT, bisize, (LPARAM) bi);
351  if(!ret) {
352  av_log(s, AV_LOG_ERROR, "Could not set Video Format.\n");
353  goto fail;
354  }
355 
356  biCompression = bi->bmiHeader.biCompression;
357  biBitCount = bi->bmiHeader.biBitCount;
358 
359  /* Set sequence setup */
360  ret = SendMessage(ctx->hwnd, WM_CAP_GET_SEQUENCE_SETUP, sizeof(cparms),
361  (LPARAM) &cparms);
362  if(!ret)
363  goto fail;
364 
365  dump_captureparms(s, &cparms);
366 
367  cparms.fYield = 1; // Spawn a background thread
368  cparms.dwRequestMicroSecPerFrame =
369  (framerate_q.den*1000000) / framerate_q.num;
370  cparms.fAbortLeftMouse = 0;
371  cparms.fAbortRightMouse = 0;
372  cparms.fCaptureAudio = 0;
373  cparms.vKeyAbort = 0;
374 
375  ret = SendMessage(ctx->hwnd, WM_CAP_SET_SEQUENCE_SETUP, sizeof(cparms),
376  (LPARAM) &cparms);
377  if(!ret)
378  goto fail;
379 
380  st->avg_frame_rate = framerate_q;
381 
382  par = st->codecpar;
384  par->width = bi->bmiHeader.biWidth;
385  par->height = bi->bmiHeader.biHeight;
386  par->format = vfw_pixfmt(biCompression, biBitCount);
387  if (par->format == AV_PIX_FMT_NONE) {
388  par->codec_id = vfw_codecid(biCompression);
389  if (par->codec_id == AV_CODEC_ID_NONE) {
390  av_log(s, AV_LOG_ERROR, "Unknown compression type. "
391  "Please report verbose (-v 9) debug information.\n");
392  vfw_read_close(s);
393  return AVERROR_PATCHWELCOME;
394  }
395  par->bits_per_coded_sample = biBitCount;
396  } else {
398  if(biCompression == BI_RGB) {
399  par->bits_per_coded_sample = biBitCount;
401  if (par->extradata) {
402  par->extradata_size = 9;
403  memcpy(par->extradata, "BottomUp", 9);
404  }
405  }
406  }
407 
408  av_freep(&bi);
409 
410  avpriv_set_pts_info(st, 32, 1, 1000);
411 
412  ctx->mutex = CreateMutex(NULL, 0, NULL);
413  if(!ctx->mutex) {
414  av_log(s, AV_LOG_ERROR, "Could not create Mutex.\n" );
415  goto fail;
416  }
417  ctx->event = CreateEvent(NULL, 1, 0, NULL);
418  if(!ctx->event) {
419  av_log(s, AV_LOG_ERROR, "Could not create Event.\n" );
420  goto fail;
421  }
422 
423  ret = SendMessage(ctx->hwnd, WM_CAP_SEQUENCE_NOFILE, 0, 0);
424  if(!ret) {
425  av_log(s, AV_LOG_ERROR, "Could not start capture sequence.\n" );
426  goto fail;
427  }
428 
429  return 0;
430 
431 fail:
432  av_freep(&bi);
433  vfw_read_close(s);
434  return AVERROR(EIO);
435 }
436 
438 {
439  struct vfw_ctx *ctx = s->priv_data;
441 
442  while(!pktl) {
443  WaitForSingleObject(ctx->mutex, INFINITE);
444  pktl = ctx->pktl;
445  if(ctx->pktl) {
446  *pkt = ctx->pktl->pkt;
447  ctx->pktl = ctx->pktl->next;
448  av_free(pktl);
449  }
450  ResetEvent(ctx->event);
451  ReleaseMutex(ctx->mutex);
452  if(!pktl) {
453  if(s->flags & AVFMT_FLAG_NONBLOCK) {
454  return AVERROR(EAGAIN);
455  } else {
456  WaitForSingleObject(ctx->event, INFINITE);
457  }
458  }
459  }
460 
461  ctx->curbufsize -= pkt->size;
462 
463  return pkt->size;
464 }
465 
466 #define OFFSET(x) offsetof(struct vfw_ctx, x)
467 #define DEC AV_OPT_FLAG_DECODING_PARAM
468 static const AVOption options[] = {
469  { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
470  { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = "ntsc"}, 0, 0, DEC },
471  { NULL },
472 };
473 
474 static const AVClass vfw_class = {
475  .class_name = "VFW indev",
476  .item_name = av_default_item_name,
477  .option = options,
478  .version = LIBAVUTIL_VERSION_INT,
480 };
481 
483  .name = "vfwcap",
484  .long_name = NULL_IF_CONFIG_SMALL("VfW video capture"),
485  .priv_data_size = sizeof(struct vfw_ctx),
486  .read_header = vfw_read_header,
487  .read_packet = vfw_read_packet,
488  .read_close = vfw_read_close,
489  .flags = AVFMT_NOFILE,
490  .priv_class = &vfw_class,
491 };
packed YUV 4:2:2, 16bpp, Cb Y0 Cr Y1
Definition: pixfmt.h:82
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
int av_parse_video_rate(AVRational *rate, const char *arg)
Parse str and store the detected values in *rate.
Definition: parseutils.c:174
AVOption.
Definition: opt.h:245
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:143
#define LIBAVUTIL_VERSION_INT
Definition: version.h:70
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:4493
static enum AVPixelFormat vfw_pixfmt(DWORD biCompression, WORD biBitCount)
Definition: vfwcap.c:54
unsigned int max_picture_buffer
Maximum amount of memory in bytes to use for buffering frames obtained from realtime capture devices...
Definition: avformat.h:1515
static void dump_captureparms(AVFormatContext *s, CAPTUREPARMS *cparms)
Definition: vfwcap.c:97
#define HWND_MESSAGE
Definition: vfwcap.c:39
HANDLE mutex
Definition: vfwcap.c:45
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3939
int num
numerator
Definition: rational.h:44
int size
Definition: avcodec.h:1589
static int vfw_read_close(AVFormatContext *s)
Definition: vfwcap.c:219
static AVPacket pkt
static const AVClass vfw_class
Definition: vfwcap.c:474
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3931
packed RGB 1:2:1 bitstream, 4bpp, (msb)1R 2G 1B(lsb), a byte contains two pixels, the first pixel in ...
Definition: pixfmt.h:88
HWND hwnd
Definition: vfwcap.c:44
Format I/O context.
Definition: avformat.h:1325
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
#define AVFMT_FLAG_NONBLOCK
Do not block when reading packets from input.
Definition: avformat.h:1439
unsigned int curbufsize
Definition: vfwcap.c:48
static void dump_videohdr(AVFormatContext *s, VIDEOHDR *vhdr)
Definition: vfwcap.c:126
uint8_t
#define av_malloc(s)
int width
Video only.
Definition: avcodec.h:4005
AVOptions.
AVPacket pkt
Definition: avformat.h:1933
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4131
int flags
Flags modifying the (de)muxer behaviour.
Definition: avformat.h:1436
uint8_t * data
Definition: avcodec.h:1588
HANDLE HWND
#define av_log(a,...)
Main libavdevice API header.
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:86
static void dump_bih(AVFormatContext *s, BITMAPINFOHEADER *bih)
Definition: vfwcap.c:143
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:189
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
unsigned short WORD
av_default_item_name
#define AVERROR(e)
Definition: error.h:43
#define FALSE
Definition: windows2linux.h:37
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3935
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:954
#define fail()
Definition: checkasm.h:82
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3957
#define dstruct(pctx, sname, var, type)
Definition: vfwcap.c:94
common internal API header
char filename[1024]
input or output filename
Definition: avformat.h:1401
int32_t * LONG_PTR
PVOID HANDLE
AVFormatContext * ctx
Definition: movenc.c:48
static enum AVCodecID vfw_codecid(DWORD biCompression)
Definition: vfwcap.c:82
#define TRUE
Definition: windows2linux.h:33
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:65
HANDLE event
Definition: vfwcap.c:46
#define FF_ARRAY_ELEMS(a)
Stream structure.
Definition: avformat.h:876
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
static DWORD dwFlags
Definition: w32pthreads.h:197
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
unsigned int frame_num
Definition: vfwcap.c:49
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:563
#define AV_PIX_FMT_RGB32
Definition: pixfmt.h:320
packed YUV 4:2:2, 16bpp, Y0 Cb Y1 Cr
Definition: pixfmt.h:63
Describe the class of an AVClass context structure.
Definition: log.h:67
rational number numerator/denominator
Definition: rational.h:43
static int vfw_read_header(AVFormatContext *s)
Definition: vfwcap.c:245
uint32_t DWORD
misc parsing utilities
AVInputFormat ff_vfwcap_demuxer
Definition: vfwcap.c:482
#define OFFSET(x)
Definition: vfwcap.c:466
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:62
struct AVPacketList * next
Definition: avformat.h:1934
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:476
Y , 1bpp, 0 is white, 1 is black, in each byte pixels are ordered from the msb to the lsb...
Definition: pixfmt.h:71
char * framerate
Set by a private option.
Definition: vfwcap.c:51
AVPacketList * pktl
Definition: vfwcap.c:47
static const AVOption options[]
Definition: vfwcap.c:468
#define DEC
Definition: vfwcap.c:467
packed RGB 3:3:2, 8bpp, (msb)2R 3G 3B(lsb)
Definition: pixfmt.h:87
#define AV_PIX_FMT_RGB555
Definition: pixfmt.h:331
int den
denominator
Definition: rational.h:45
static int vfw_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: vfwcap.c:437
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:731
LONG_PTR LRESULT
char * video_size
A string describing video size, set by a private option.
Definition: vfwcap.c:50
#define av_free(p)
static int shall_we_drop(AVFormatContext *s)
Definition: vfwcap.c:161
void * priv_data
Format private data.
Definition: avformat.h:1353
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:3981
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3953
static LRESULT CALLBACK videostream_cb(HWND hwnd, LPVIDEOHDR vdhdr)
Definition: vfwcap.c:177
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:660
AVCodecParameters * codecpar
Definition: avformat.h:1228
Definition: vfwcap.c:42
#define MKTAG(a, b, c, d)
Definition: common.h:342
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
This structure stores compressed data.
Definition: avcodec.h:1565
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:252
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1581