FFmpeg: libavdevice/vfwcap.c Source File

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libavdevice

vfwcap.c

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1 /*

2 * VFW capture interface

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 */

22 #include "libavutil/internal.h"

23 #include "libavutil/log.h"

24 #include "libavutil/opt.h"

25 #include "libavutil/parseutils.h"

27 #include "libavformat/internal.h"

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>

35 #include "avdevice.h"

37 /* Some obsolete versions of MinGW32 before 4.0.0 lack this. */

38 #ifndef HWND_MESSAGE

39 #define HWND_MESSAGE ((HWND) -3)

40 #endif

42 struct vfw_ctx {

43 const AVClass *class;

44 HWND hwnd;

45 HANDLE mutex;

46 HANDLE event;

47 AVPacketList *pktl;

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 };

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 }

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 }

94 #define dstruct(pctx, sname, var, type) \

95 av_log(pctx, AV_LOG_DEBUG, #var":\t%"type"\n", sname->var)

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

161 static int shall_we_drop(AVFormatContext *s)

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 {

179 AVFormatContext *s;

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

219 static int vfw_read_close(AVFormatContext *s)

220 {

221 struct vfw_ctx *ctx = s->priv_data;

222 AVPacketList *pktl;

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

245 static int vfw_read_header(AVFormatContext *s)

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->url, "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->url);

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;

383 par->codec_type = AVMEDIA_TYPE_VIDEO;

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 avpriv_report_missing_feature(s, "This compression type");

391 vfw_read_close(s);

392 return AVERROR_PATCHWELCOME;

393 }

394 par->bits_per_coded_sample = biBitCount;

395 } else {

396 par->codec_id = AV_CODEC_ID_RAWVIDEO;

397 if(biCompression == BI_RGB) {

398 par->bits_per_coded_sample = biBitCount;

399 par->extradata = av_malloc(9 + AV_INPUT_BUFFER_PADDING_SIZE);

400 if (par->extradata) {

401 par->extradata_size = 9;

402 memcpy(par->extradata, "BottomUp", 9);

403 }

404 }

405 }

406

407 av_freep(&bi);

408

409 avpriv_set_pts_info(st, 32, 1, 1000);

410

411 ctx->mutex = CreateMutex(NULL, 0, NULL);

412 if(!ctx->mutex) {

413 av_log(s, AV_LOG_ERROR, "Could not create Mutex.\n" );

414 goto fail;

415 }

416 ctx->event = CreateEvent(NULL, 1, 0, NULL);

417 if(!ctx->event) {

418 av_log(s, AV_LOG_ERROR, "Could not create Event.\n" );

419 goto fail;

420 }

421

422 ret = SendMessage(ctx->hwnd, WM_CAP_SEQUENCE_NOFILE, 0, 0);

423 if(!ret) {

424 av_log(s, AV_LOG_ERROR, "Could not start capture sequence.\n" );

425 goto fail;

426 }

427

428 return 0;

429

430 fail:

431 av_freep(&bi);

432 vfw_read_close(s);

433 return AVERROR(EIO);

434 }

435

436 static int vfw_read_packet(AVFormatContext *s, AVPacket *pkt)

437 {

438 struct vfw_ctx *ctx = s->priv_data;

439 AVPacketList *pktl = NULL;

440

441 while(!pktl) {

442 WaitForSingleObject(ctx->mutex, INFINITE);

443 pktl = ctx->pktl;

444 if(ctx->pktl) {

445 *pkt = ctx->pktl->pkt;

446 ctx->pktl = ctx->pktl->next;

447 av_free(pktl);

448 }

449 ResetEvent(ctx->event);

450 ReleaseMutex(ctx->mutex);

451 if(!pktl) {

452 if(s->flags & AVFMT_FLAG_NONBLOCK) {

453 return AVERROR(EAGAIN);

454 } else {

455 WaitForSingleObject(ctx->event, INFINITE);

456 }

457 }

458 }

459

460 ctx->curbufsize -= pkt->size;

461

462 return pkt->size;

463 }

464

465 #define OFFSET(x) offsetof(struct vfw_ctx, x)

466 #define DEC AV_OPT_FLAG_DECODING_PARAM

467 static const AVOption options[] = {

468 { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },

469 { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = "ntsc"}, 0, 0, DEC },

470 { NULL },

471 };

472

473 static const AVClass vfw_class = {

474 .class_name = "VFW indev",

475 .item_name = av_default_item_name,

476 .option = options,

477 .version = LIBAVUTIL_VERSION_INT,

478 .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT

479 };

480

481 AVInputFormat ff_vfwcap_demuxer = {

482 .name = "vfwcap",

483 .long_name = NULL_IF_CONFIG_SMALL("VfW video capture"),

484 .priv_data_size = sizeof(struct vfw_ctx),

485 .read_header = vfw_read_header,

486 .read_packet = vfw_read_packet,

487 .read_close = vfw_read_close,

488 .flags = AVFMT_NOFILE,

489 .priv_class = &vfw_class,

490 };

AV_PIX_FMT_UYVY422

packed YUV 4:2:2, 16bpp, Cb Y0 Cr Y1

Definition: pixfmt.h:77

NULL

#define NULL

Definition: coverity.c:32

const char * s

Definition: avisynth_c.h:768

AV_CODEC_ID_NONE

Definition: avcodec.h:216

av_parse_video_rate

int av_parse_video_rate(AVRational *rate, const char *arg)

Parse str and store the detected values in *rate.

Definition: parseutils.c:179

AV_PIX_FMT_NONE

Definition: pixfmt.h:61

AVOption

AVOption.

Definition: opt.h:246

WaitForSingleObject

#define WaitForSingleObject(a, b)

Definition: w32pthreads.h:62

av_parse_video_size

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

LIBAVUTIL_VERSION_INT

#define LIBAVUTIL_VERSION_INT

Definition: version.h:85

avpriv_set_pts_info

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:4820

vfw_pixfmt

static enum AVPixelFormat vfw_pixfmt(DWORD biCompression, WORD biBitCount)

Definition: vfwcap.c:54

AVFormatContext::max_picture_buffer

unsigned int max_picture_buffer

Maximum amount of memory in bytes to use for buffering frames obtained from realtime capture devices...

Definition: avformat.h:1556

dump_captureparms

static void dump_captureparms(AVFormatContext *s, CAPTUREPARMS *cparms)

Definition: vfwcap.c:97

HWND_MESSAGE

#define HWND_MESSAGE

Definition: vfwcap.c:39

vfw_ctx::mutex

HANDLE mutex

Definition: vfwcap.c:45

AVCodecParameters::codec_id

enum AVCodecID codec_id

Specific type of the encoded data (the codec used).

Definition: avcodec.h:3884

AVRational::num

int num

Numerator.

Definition: rational.h:59

AVPacket::size

int size

Definition: avcodec.h:1431

av_default_item_name

const char * av_default_item_name(void *ptr)

Return the context name.

Definition: log.c:191

vfw_read_close

static int vfw_read_close(AVFormatContext *s)

Definition: vfwcap.c:219

av_mallocz

void * av_mallocz(size_t size)

Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...

Definition: mem.c:236

AVInputFormat

Definition: avformat.h:642

pkt

static AVPacket pkt

Definition: demuxing_decoding.c:54

vfw_class

static const AVClass vfw_class

Definition: vfwcap.c:473

AVCodecParameters

This struct describes the properties of an encoded stream.

Definition: avcodec.h:3876

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:83

vfw_ctx::hwnd

HWND hwnd

Definition: vfwcap.c:44

AVFormatContext

Format I/O context.

Definition: avformat.h:1342

AVClass::class_name

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

AVFMT_FLAG_NONBLOCK

#define AVFMT_FLAG_NONBLOCK

Do not block when reading packets from input.

Definition: avformat.h:1476

vfw_ctx::curbufsize

unsigned int curbufsize

Definition: vfwcap.c:48

dump_videohdr

static void dump_videohdr(AVFormatContext *s, VIDEOHDR *vhdr)

Definition: vfwcap.c:126

uint8_t

Definition: audio_convert.c:194

av_malloc

#define av_malloc(s)

Definition: tableprint_vlc.h:31

AVCodecParameters::width

int width

Video only.

Definition: avcodec.h:3950

opt.h

AVOptions.

AVPacketList::pkt

AVPacket pkt

Definition: avformat.h:2000

avformat_new_stream

AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)

Add a new stream to a media file.

Definition: utils.c:4450

AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT

Definition: log.h:42

AV_OPT_TYPE_STRING

Definition: opt.h:227

AVFormatContext::flags

int flags

Flags modifying the (de)muxer behaviour.

Definition: avformat.h:1473

AVPacket::data

uint8_t * data

Definition: avcodec.h:1430

AVPacketList

Definition: avformat.h:1999

AV_CODEC_ID_MJPEG

Definition: avcodec.h:225

HWND

HANDLE HWND

Definition: basicDataTypeConversions.h:22

av_log

#define av_log(a,...)

Definition: tableprint_vlc.h:28

AV_CODEC_ID_DVVIDEO

Definition: avcodec.h:242

avdevice.h

Main libavdevice API header.

av_new_packet

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

dump_bih

static void dump_bih(AVFormatContext *s, BITMAPINFOHEADER *bih)

Definition: vfwcap.c:143

AVCodecID

Identify the syntax and semantics of the bitstream.

Definition: avcodec.h:215

AV_LOG_ERROR

#define AV_LOG_ERROR

Something went wrong and cannot losslessly be recovered.

Definition: log.h:176

WORD

unsigned short WORD

Definition: basicDataTypeConversions.h:48

AVERROR

#define AVERROR(e)

Definition: error.h:43

AVCodecParameters::format

int format

Definition: avcodec.h:3908

FALSE

#define FALSE

Definition: windows2linux.h:37

NULL_IF_CONFIG_SMALL

#define NULL_IF_CONFIG_SMALL(x)

Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...

Definition: internal.h:186

AVFormatContext::url

char * url

input or output URL.

Definition: avformat.h:1438

AV_LOG_DEBUG

#define AV_LOG_DEBUG

Stuff which is only useful for libav* developers.

Definition: log.h:197

AVCodecParameters::codec_type

enum AVMediaType codec_type

General type of the encoded data.

Definition: avcodec.h:3880

internal.h

AVStream::avg_frame_rate

AVRational avg_frame_rate

Average framerate.

Definition: avformat.h:946

fail

#define fail()

Definition: checkasm.h:116

AVCodecParameters::extradata_size

int extradata_size

Size of the extradata content in bytes.

Definition: avcodec.h:3902

dstruct

#define dstruct(pctx, sname, var, type)

Definition: vfwcap.c:94

internal.h

common internal API header

LONG_PTR

int32_t * LONG_PTR

Definition: basicDataTypeConversions.h:58

HANDLE

PVOID HANDLE

Definition: basicDataTypeConversions.h:21

AVCodecParameters::height

int height

Definition: avcodec.h:3951

ctx

AVFormatContext * ctx

Definition: movenc.c:48

vfw_codecid

static enum AVCodecID vfw_codecid(DWORD biCompression)

Definition: vfwcap.c:82

TRUE

#define TRUE

Definition: windows2linux.h:33

AV_PIX_FMT_BGR24

packed RGB 8:8:8, 24bpp, BGRBGR...

Definition: pixfmt.h:65

vfw_ctx::event

HANDLE event

Definition: vfwcap.c:46

FF_ARRAY_ELEMS

#define FF_ARRAY_ELEMS(a)

Definition: sinewin_tablegen_template.c:36

AVStream

Stream structure.

Definition: avformat.h:873

AVERROR_PATCHWELCOME

#define AVERROR_PATCHWELCOME

Not yet implemented in FFmpeg, patches welcome.

Definition: error.h:62

AV_LOG_INFO

#define AV_LOG_INFO

Standard information.

Definition: log.h:187

vfw_ctx::frame_num

unsigned int frame_num

Definition: vfwcap.c:49

av_packet_unref

void av_packet_unref(AVPacket *pkt)

Wipe the packet.

Definition: avpacket.c:592

AV_PIX_FMT_RGB32

#define AV_PIX_FMT_RGB32

Definition: pixfmt.h:342

AV_PIX_FMT_YUYV422

packed YUV 4:2:2, 16bpp, Y0 Cb Y1 Cr

Definition: pixfmt.h:63

AVClass

Describe the class of an AVClass context structure.

Definition: log.h:67

AVRational

Rational number (pair of numerator and denominator).

Definition: rational.h:58

vfw_read_header

static int vfw_read_header(AVFormatContext *s)

Definition: vfwcap.c:245

DWORD

uint32_t DWORD

Definition: basicDataTypeConversions.h:51

parseutils.h

misc parsing utilities

avpriv_report_missing_feature

void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2

Log a generic warning message about a missing feature.

ff_vfwcap_demuxer

AVInputFormat ff_vfwcap_demuxer

Definition: vfwcap.c:481

OFFSET

#define OFFSET(x)

Definition: vfwcap.c:465

AV_PIX_FMT_YUV420P

planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)

Definition: pixfmt.h:62

AVPacketList::next

struct AVPacketList * next

Definition: avformat.h:2001

AVFMT_NOFILE

#define AVFMT_NOFILE

Demuxer will use avio_open, no opened file should be provided by the caller.

Definition: avformat.h:465

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:71

vfw_ctx::framerate

char * framerate

Set by a private option.

Definition: vfwcap.c:51

vfw_ctx::pktl

AVPacketList * pktl

Definition: vfwcap.c:47

options

static const AVOption options[]

Definition: vfwcap.c:467

DEC

#define DEC

Definition: vfwcap.c:466

AV_PIX_FMT_RGB8

packed RGB 3:3:2, 8bpp, (msb)2R 3G 3B(lsb)

Definition: pixfmt.h:82

AV_PIX_FMT_RGB555

#define AV_PIX_FMT_RGB555

Definition: pixfmt.h:356

AVRational::den

int den

Denominator.

Definition: rational.h:60

vfw_read_packet

static int vfw_read_packet(AVFormatContext *s, AVPacket *pkt)

Definition: vfwcap.c:436

AV_INPUT_BUFFER_PADDING_SIZE

#define AV_INPUT_BUFFER_PADDING_SIZE

Required number of additionally allocated bytes at the end of the input bitstream for decoding...

Definition: avcodec.h:773

LRESULT

LONG_PTR LRESULT

Definition: basicDataTypeConversions.h:59

vfw_ctx::video_size

char * video_size

A string describing video size, set by a private option.

Definition: vfwcap.c:50

av_free

#define av_free(p)

Definition: tableprint_vlc.h:34

shall_we_drop

static int shall_we_drop(AVFormatContext *s)

Definition: vfwcap.c:161

AVFormatContext::priv_data

void * priv_data

Format private data.

Definition: avformat.h:1370

log.h

AVCodecParameters::bits_per_coded_sample

int bits_per_coded_sample

The number of bits per sample in the codedwords.

Definition: avcodec.h:3926

AVCodecParameters::extradata

uint8_t * extradata

Extra binary data needed for initializing the decoder, codec-dependent.

Definition: avcodec.h:3898

videostream_cb

static LRESULT CALLBACK videostream_cb(HWND hwnd, LPVIDEOHDR vdhdr)

Definition: vfwcap.c:177

av_freep

#define av_freep(p)

Definition: tableprint_vlc.h:35

AVInputFormat::name

const char * name

A comma separated list of short names for the format.

Definition: avformat.h:647

AVMEDIA_TYPE_VIDEO

Definition: avutil.h:201

AVStream::codecpar

AVCodecParameters * codecpar

Codec parameters associated with this stream.

Definition: avformat.h:1020

AV_CODEC_ID_RAWVIDEO

Definition: avcodec.h:231

vfw_ctx

Definition: vfwcap.c:42

MKTAG

#define MKTAG(a, b, c, d)

Definition: common.h:366

AVPixelFormat

Pixel format.

Definition: pixfmt.h:60

AVPacket

This structure stores compressed data.

Definition: avcodec.h:1407

AVPacket::pts

int64_t pts

Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...

Definition: avcodec.h:1423

Generated on Sun May 13 2018 02:03:59 for FFmpeg by doxygen 1.8.6