| 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 "libavformat/internal.h" |
| 23 | #include "libavutil/log.h" |
| 24 | #include "libavutil/opt.h" |
| 25 | #include "libavutil/parseutils.h" |
| 26 | #include <windows.h> |
| 27 | #include <vfw.h> |
| 28 | #include "avdevice.h" |
| 29 | |
| 30 | /* Some obsolete versions of MinGW32 before 4.0.0 lack this. */ |
| 31 | #ifndef HWND_MESSAGE |
| 32 | #define HWND_MESSAGE ((HWND) -3) |
| 33 | #endif |
| 34 | |
| 35 | struct vfw_ctx { |
| 36 | const AVClass *class; |
| 37 | HWND hwnd; |
| 38 | HANDLE mutex; |
| 39 | HANDLE event; |
| 40 | AVPacketList *pktl; |
| 41 | unsigned int curbufsize; |
| 42 | unsigned int frame_num; |
| 43 | char *video_size; /**< A string describing video size, set by a private option. */ |
| 44 | char *framerate; /**< Set by a private option. */ |
| 45 | }; |
| 46 | |
| 47 | static enum AVPixelFormat vfw_pixfmt(DWORD biCompression, WORD biBitCount) |
| 48 | { |
| 49 | switch(biCompression) { |
| 50 | case MKTAG('U', 'Y', 'V', 'Y'): |
| 51 | return AV_PIX_FMT_UYVY422; |
| 52 | case MKTAG('Y', 'U', 'Y', '2'): |
| 53 | return AV_PIX_FMT_YUYV422; |
| 54 | case MKTAG('I', '4', '2', '0'): |
| 55 | return AV_PIX_FMT_YUV420P; |
| 56 | case BI_RGB: |
| 57 | switch(biBitCount) { /* 1-8 are untested */ |
| 58 | case 1: |
| 59 | return AV_PIX_FMT_MONOWHITE; |
| 60 | case 4: |
| 61 | return AV_PIX_FMT_RGB4; |
| 62 | case 8: |
| 63 | return AV_PIX_FMT_RGB8; |
| 64 | case 16: |
| 65 | return AV_PIX_FMT_RGB555; |
| 66 | case 24: |
| 67 | return AV_PIX_FMT_BGR24; |
| 68 | case 32: |
| 69 | return AV_PIX_FMT_RGB32; |
| 70 | } |
| 71 | } |
| 72 | return AV_PIX_FMT_NONE; |
| 73 | } |
| 74 | |
| 75 | static enum AVCodecID vfw_codecid(DWORD biCompression) |
| 76 | { |
| 77 | switch(biCompression) { |
| 78 | case MKTAG('d', 'v', 's', 'd'): |
| 79 | return AV_CODEC_ID_DVVIDEO; |
| 80 | case MKTAG('M', 'J', 'P', 'G'): |
| 81 | case MKTAG('m', 'j', 'p', 'g'): |
| 82 | return AV_CODEC_ID_MJPEG; |
| 83 | } |
| 84 | return AV_CODEC_ID_NONE; |
| 85 | } |
| 86 | |
| 87 | #define dstruct(pctx, sname, var, type) \ |
| 88 | av_log(pctx, AV_LOG_DEBUG, #var":\t%"type"\n", sname->var) |
| 89 | |
| 90 | static void dump_captureparms(AVFormatContext *s, CAPTUREPARMS *cparms) |
| 91 | { |
| 92 | av_log(s, AV_LOG_DEBUG, "CAPTUREPARMS\n"); |
| 93 | dstruct(s, cparms, dwRequestMicroSecPerFrame, "lu"); |
| 94 | dstruct(s, cparms, fMakeUserHitOKToCapture, "d"); |
| 95 | dstruct(s, cparms, wPercentDropForError, "u"); |
| 96 | dstruct(s, cparms, fYield, "d"); |
| 97 | dstruct(s, cparms, dwIndexSize, "lu"); |
| 98 | dstruct(s, cparms, wChunkGranularity, "u"); |
| 99 | dstruct(s, cparms, fUsingDOSMemory, "d"); |
| 100 | dstruct(s, cparms, wNumVideoRequested, "u"); |
| 101 | dstruct(s, cparms, fCaptureAudio, "d"); |
| 102 | dstruct(s, cparms, wNumAudioRequested, "u"); |
| 103 | dstruct(s, cparms, vKeyAbort, "u"); |
| 104 | dstruct(s, cparms, fAbortLeftMouse, "d"); |
| 105 | dstruct(s, cparms, fAbortRightMouse, "d"); |
| 106 | dstruct(s, cparms, fLimitEnabled, "d"); |
| 107 | dstruct(s, cparms, wTimeLimit, "u"); |
| 108 | dstruct(s, cparms, fMCIControl, "d"); |
| 109 | dstruct(s, cparms, fStepMCIDevice, "d"); |
| 110 | dstruct(s, cparms, dwMCIStartTime, "lu"); |
| 111 | dstruct(s, cparms, dwMCIStopTime, "lu"); |
| 112 | dstruct(s, cparms, fStepCaptureAt2x, "d"); |
| 113 | dstruct(s, cparms, wStepCaptureAverageFrames, "u"); |
| 114 | dstruct(s, cparms, dwAudioBufferSize, "lu"); |
| 115 | dstruct(s, cparms, fDisableWriteCache, "d"); |
| 116 | dstruct(s, cparms, AVStreamMaster, "u"); |
| 117 | } |
| 118 | |
| 119 | static void dump_videohdr(AVFormatContext *s, VIDEOHDR *vhdr) |
| 120 | { |
| 121 | #ifdef DEBUG |
| 122 | av_log(s, AV_LOG_DEBUG, "VIDEOHDR\n"); |
| 123 | dstruct(s, vhdr, lpData, "p"); |
| 124 | dstruct(s, vhdr, dwBufferLength, "lu"); |
| 125 | dstruct(s, vhdr, dwBytesUsed, "lu"); |
| 126 | dstruct(s, vhdr, dwTimeCaptured, "lu"); |
| 127 | dstruct(s, vhdr, dwUser, "lu"); |
| 128 | dstruct(s, vhdr, dwFlags, "lu"); |
| 129 | dstruct(s, vhdr, dwReserved[0], "lu"); |
| 130 | dstruct(s, vhdr, dwReserved[1], "lu"); |
| 131 | dstruct(s, vhdr, dwReserved[2], "lu"); |
| 132 | dstruct(s, vhdr, dwReserved[3], "lu"); |
| 133 | #endif |
| 134 | } |
| 135 | |
| 136 | static void dump_bih(AVFormatContext *s, BITMAPINFOHEADER *bih) |
| 137 | { |
| 138 | av_log(s, AV_LOG_DEBUG, "BITMAPINFOHEADER\n"); |
| 139 | dstruct(s, bih, biSize, "lu"); |
| 140 | dstruct(s, bih, biWidth, "ld"); |
| 141 | dstruct(s, bih, biHeight, "ld"); |
| 142 | dstruct(s, bih, biPlanes, "d"); |
| 143 | dstruct(s, bih, biBitCount, "d"); |
| 144 | dstruct(s, bih, biCompression, "lu"); |
| 145 | av_log(s, AV_LOG_DEBUG, " biCompression:\t\"%.4s\"\n", |
| 146 | (char*) &bih->biCompression); |
| 147 | dstruct(s, bih, biSizeImage, "lu"); |
| 148 | dstruct(s, bih, biXPelsPerMeter, "lu"); |
| 149 | dstruct(s, bih, biYPelsPerMeter, "lu"); |
| 150 | dstruct(s, bih, biClrUsed, "lu"); |
| 151 | dstruct(s, bih, biClrImportant, "lu"); |
| 152 | } |
| 153 | |
| 154 | static int shall_we_drop(AVFormatContext *s) |
| 155 | { |
| 156 | struct vfw_ctx *ctx = s->priv_data; |
| 157 | static const uint8_t dropscore[] = {62, 75, 87, 100}; |
| 158 | const int ndropscores = FF_ARRAY_ELEMS(dropscore); |
| 159 | unsigned int buffer_fullness = (ctx->curbufsize*100)/s->max_picture_buffer; |
| 160 | |
| 161 | if(dropscore[++ctx->frame_num%ndropscores] <= buffer_fullness) { |
| 162 | av_log(s, AV_LOG_ERROR, |
| 163 | "real-time buffer %d%% full! frame dropped!\n", buffer_fullness); |
| 164 | return 1; |
| 165 | } |
| 166 | |
| 167 | return 0; |
| 168 | } |
| 169 | |
| 170 | static LRESULT CALLBACK videostream_cb(HWND hwnd, LPVIDEOHDR vdhdr) |
| 171 | { |
| 172 | AVFormatContext *s; |
| 173 | struct vfw_ctx *ctx; |
| 174 | AVPacketList **ppktl, *pktl_next; |
| 175 | |
| 176 | s = (AVFormatContext *) GetWindowLongPtr(hwnd, GWLP_USERDATA); |
| 177 | ctx = s->priv_data; |
| 178 | |
| 179 | dump_videohdr(s, vdhdr); |
| 180 | |
| 181 | if(shall_we_drop(s)) |
| 182 | return FALSE; |
| 183 | |
| 184 | WaitForSingleObject(ctx->mutex, INFINITE); |
| 185 | |
| 186 | pktl_next = av_mallocz(sizeof(AVPacketList)); |
| 187 | if(!pktl_next) |
| 188 | goto fail; |
| 189 | |
| 190 | if(av_new_packet(&pktl_next->pkt, vdhdr->dwBytesUsed) < 0) { |
| 191 | av_free(pktl_next); |
| 192 | goto fail; |
| 193 | } |
| 194 | |
| 195 | pktl_next->pkt.pts = vdhdr->dwTimeCaptured; |
| 196 | memcpy(pktl_next->pkt.data, vdhdr->lpData, vdhdr->dwBytesUsed); |
| 197 | |
| 198 | for(ppktl = &ctx->pktl ; *ppktl ; ppktl = &(*ppktl)->next); |
| 199 | *ppktl = pktl_next; |
| 200 | |
| 201 | ctx->curbufsize += vdhdr->dwBytesUsed; |
| 202 | |
| 203 | SetEvent(ctx->event); |
| 204 | ReleaseMutex(ctx->mutex); |
| 205 | |
| 206 | return TRUE; |
| 207 | fail: |
| 208 | ReleaseMutex(ctx->mutex); |
| 209 | return FALSE; |
| 210 | } |
| 211 | |
| 212 | static int vfw_read_close(AVFormatContext *s) |
| 213 | { |
| 214 | struct vfw_ctx *ctx = s->priv_data; |
| 215 | AVPacketList *pktl; |
| 216 | |
| 217 | if(ctx->hwnd) { |
| 218 | SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0); |
| 219 | SendMessage(ctx->hwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0); |
| 220 | DestroyWindow(ctx->hwnd); |
| 221 | } |
| 222 | if(ctx->mutex) |
| 223 | CloseHandle(ctx->mutex); |
| 224 | if(ctx->event) |
| 225 | CloseHandle(ctx->event); |
| 226 | |
| 227 | pktl = ctx->pktl; |
| 228 | while (pktl) { |
| 229 | AVPacketList *next = pktl->next; |
| 230 | av_free_packet(&pktl->pkt); |
| 231 | av_free(pktl); |
| 232 | pktl = next; |
| 233 | } |
| 234 | |
| 235 | return 0; |
| 236 | } |
| 237 | |
| 238 | static int vfw_read_header(AVFormatContext *s) |
| 239 | { |
| 240 | struct vfw_ctx *ctx = s->priv_data; |
| 241 | AVCodecContext *codec; |
| 242 | AVStream *st; |
| 243 | int devnum; |
| 244 | int bisize; |
| 245 | BITMAPINFO *bi = NULL; |
| 246 | CAPTUREPARMS cparms; |
| 247 | DWORD biCompression; |
| 248 | WORD biBitCount; |
| 249 | int ret; |
| 250 | AVRational framerate_q; |
| 251 | |
| 252 | if (!strcmp(s->filename, "list")) { |
| 253 | for (devnum = 0; devnum <= 9; devnum++) { |
| 254 | char driver_name[256]; |
| 255 | char driver_ver[256]; |
| 256 | ret = capGetDriverDescription(devnum, |
| 257 | driver_name, sizeof(driver_name), |
| 258 | driver_ver, sizeof(driver_ver)); |
| 259 | if (ret) { |
| 260 | av_log(s, AV_LOG_INFO, "Driver %d\n", devnum); |
| 261 | av_log(s, AV_LOG_INFO, " %s\n", driver_name); |
| 262 | av_log(s, AV_LOG_INFO, " %s\n", driver_ver); |
| 263 | } |
| 264 | } |
| 265 | return AVERROR(EIO); |
| 266 | } |
| 267 | |
| 268 | ctx->hwnd = capCreateCaptureWindow(NULL, 0, 0, 0, 0, 0, HWND_MESSAGE, 0); |
| 269 | if(!ctx->hwnd) { |
| 270 | av_log(s, AV_LOG_ERROR, "Could not create capture window.\n"); |
| 271 | return AVERROR(EIO); |
| 272 | } |
| 273 | |
| 274 | /* If atoi fails, devnum==0 and the default device is used */ |
| 275 | devnum = atoi(s->filename); |
| 276 | |
| 277 | ret = SendMessage(ctx->hwnd, WM_CAP_DRIVER_CONNECT, devnum, 0); |
| 278 | if(!ret) { |
| 279 | av_log(s, AV_LOG_ERROR, "Could not connect to device.\n"); |
| 280 | DestroyWindow(ctx->hwnd); |
| 281 | return AVERROR(ENODEV); |
| 282 | } |
| 283 | |
| 284 | SendMessage(ctx->hwnd, WM_CAP_SET_OVERLAY, 0, 0); |
| 285 | SendMessage(ctx->hwnd, WM_CAP_SET_PREVIEW, 0, 0); |
| 286 | |
| 287 | ret = SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, |
| 288 | (LPARAM) videostream_cb); |
| 289 | if(!ret) { |
| 290 | av_log(s, AV_LOG_ERROR, "Could not set video stream callback.\n"); |
| 291 | goto fail; |
| 292 | } |
| 293 | |
| 294 | SetWindowLongPtr(ctx->hwnd, GWLP_USERDATA, (LONG_PTR) s); |
| 295 | |
| 296 | st = avformat_new_stream(s, NULL); |
| 297 | if(!st) { |
| 298 | vfw_read_close(s); |
| 299 | return AVERROR(ENOMEM); |
| 300 | } |
| 301 | |
| 302 | /* Set video format */ |
| 303 | bisize = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, 0, 0); |
| 304 | if(!bisize) |
| 305 | goto fail; |
| 306 | bi = av_malloc(bisize); |
| 307 | if(!bi) { |
| 308 | vfw_read_close(s); |
| 309 | return AVERROR(ENOMEM); |
| 310 | } |
| 311 | ret = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, bisize, (LPARAM) bi); |
| 312 | if(!ret) |
| 313 | goto fail; |
| 314 | |
| 315 | dump_bih(s, &bi->bmiHeader); |
| 316 | |
| 317 | ret = av_parse_video_rate(&framerate_q, ctx->framerate); |
| 318 | if (ret < 0) { |
| 319 | av_log(s, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", ctx->framerate); |
| 320 | goto fail; |
| 321 | } |
| 322 | |
| 323 | if (ctx->video_size) { |
| 324 | ret = av_parse_video_size(&bi->bmiHeader.biWidth, &bi->bmiHeader.biHeight, ctx->video_size); |
| 325 | if (ret < 0) { |
| 326 | av_log(s, AV_LOG_ERROR, "Couldn't parse video size.\n"); |
| 327 | goto fail; |
| 328 | } |
| 329 | } |
| 330 | |
| 331 | if (0) { |
| 332 | /* For testing yet unsupported compressions |
| 333 | * Copy these values from user-supplied verbose information */ |
| 334 | bi->bmiHeader.biWidth = 320; |
| 335 | bi->bmiHeader.biHeight = 240; |
| 336 | bi->bmiHeader.biPlanes = 1; |
| 337 | bi->bmiHeader.biBitCount = 12; |
| 338 | bi->bmiHeader.biCompression = MKTAG('I','4','2','0'); |
| 339 | bi->bmiHeader.biSizeImage = 115200; |
| 340 | dump_bih(s, &bi->bmiHeader); |
| 341 | } |
| 342 | |
| 343 | ret = SendMessage(ctx->hwnd, WM_CAP_SET_VIDEOFORMAT, bisize, (LPARAM) bi); |
| 344 | if(!ret) { |
| 345 | av_log(s, AV_LOG_ERROR, "Could not set Video Format.\n"); |
| 346 | goto fail; |
| 347 | } |
| 348 | |
| 349 | biCompression = bi->bmiHeader.biCompression; |
| 350 | biBitCount = bi->bmiHeader.biBitCount; |
| 351 | |
| 352 | /* Set sequence setup */ |
| 353 | ret = SendMessage(ctx->hwnd, WM_CAP_GET_SEQUENCE_SETUP, sizeof(cparms), |
| 354 | (LPARAM) &cparms); |
| 355 | if(!ret) |
| 356 | goto fail; |
| 357 | |
| 358 | dump_captureparms(s, &cparms); |
| 359 | |
| 360 | cparms.fYield = 1; // Spawn a background thread |
| 361 | cparms.dwRequestMicroSecPerFrame = |
| 362 | (framerate_q.den*1000000) / framerate_q.num; |
| 363 | cparms.fAbortLeftMouse = 0; |
| 364 | cparms.fAbortRightMouse = 0; |
| 365 | cparms.fCaptureAudio = 0; |
| 366 | cparms.vKeyAbort = 0; |
| 367 | |
| 368 | ret = SendMessage(ctx->hwnd, WM_CAP_SET_SEQUENCE_SETUP, sizeof(cparms), |
| 369 | (LPARAM) &cparms); |
| 370 | if(!ret) |
| 371 | goto fail; |
| 372 | |
| 373 | codec = st->codec; |
| 374 | codec->time_base = av_inv_q(framerate_q); |
| 375 | codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 376 | codec->width = bi->bmiHeader.biWidth; |
| 377 | codec->height = bi->bmiHeader.biHeight; |
| 378 | codec->pix_fmt = vfw_pixfmt(biCompression, biBitCount); |
| 379 | if(codec->pix_fmt == AV_PIX_FMT_NONE) { |
| 380 | codec->codec_id = vfw_codecid(biCompression); |
| 381 | if(codec->codec_id == AV_CODEC_ID_NONE) { |
| 382 | av_log(s, AV_LOG_ERROR, "Unknown compression type. " |
| 383 | "Please report verbose (-v 9) debug information.\n"); |
| 384 | vfw_read_close(s); |
| 385 | return AVERROR_PATCHWELCOME; |
| 386 | } |
| 387 | codec->bits_per_coded_sample = biBitCount; |
| 388 | } else { |
| 389 | codec->codec_id = AV_CODEC_ID_RAWVIDEO; |
| 390 | if(biCompression == BI_RGB) { |
| 391 | codec->bits_per_coded_sample = biBitCount; |
| 392 | codec->extradata = av_malloc(9 + FF_INPUT_BUFFER_PADDING_SIZE); |
| 393 | if (codec->extradata) { |
| 394 | codec->extradata_size = 9; |
| 395 | memcpy(codec->extradata, "BottomUp", 9); |
| 396 | } |
| 397 | } |
| 398 | } |
| 399 | |
| 400 | av_freep(&bi); |
| 401 | |
| 402 | avpriv_set_pts_info(st, 32, 1, 1000); |
| 403 | |
| 404 | ctx->mutex = CreateMutex(NULL, 0, NULL); |
| 405 | if(!ctx->mutex) { |
| 406 | av_log(s, AV_LOG_ERROR, "Could not create Mutex.\n" ); |
| 407 | goto fail; |
| 408 | } |
| 409 | ctx->event = CreateEvent(NULL, 1, 0, NULL); |
| 410 | if(!ctx->event) { |
| 411 | av_log(s, AV_LOG_ERROR, "Could not create Event.\n" ); |
| 412 | goto fail; |
| 413 | } |
| 414 | |
| 415 | ret = SendMessage(ctx->hwnd, WM_CAP_SEQUENCE_NOFILE, 0, 0); |
| 416 | if(!ret) { |
| 417 | av_log(s, AV_LOG_ERROR, "Could not start capture sequence.\n" ); |
| 418 | goto fail; |
| 419 | } |
| 420 | |
| 421 | return 0; |
| 422 | |
| 423 | fail: |
| 424 | av_freep(&bi); |
| 425 | vfw_read_close(s); |
| 426 | return AVERROR(EIO); |
| 427 | } |
| 428 | |
| 429 | static int vfw_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 430 | { |
| 431 | struct vfw_ctx *ctx = s->priv_data; |
| 432 | AVPacketList *pktl = NULL; |
| 433 | |
| 434 | while(!pktl) { |
| 435 | WaitForSingleObject(ctx->mutex, INFINITE); |
| 436 | pktl = ctx->pktl; |
| 437 | if(ctx->pktl) { |
| 438 | *pkt = ctx->pktl->pkt; |
| 439 | ctx->pktl = ctx->pktl->next; |
| 440 | av_free(pktl); |
| 441 | } |
| 442 | ResetEvent(ctx->event); |
| 443 | ReleaseMutex(ctx->mutex); |
| 444 | if(!pktl) { |
| 445 | if(s->flags & AVFMT_FLAG_NONBLOCK) { |
| 446 | return AVERROR(EAGAIN); |
| 447 | } else { |
| 448 | WaitForSingleObject(ctx->event, INFINITE); |
| 449 | } |
| 450 | } |
| 451 | } |
| 452 | |
| 453 | ctx->curbufsize -= pkt->size; |
| 454 | |
| 455 | return pkt->size; |
| 456 | } |
| 457 | |
| 458 | #define OFFSET(x) offsetof(struct vfw_ctx, x) |
| 459 | #define DEC AV_OPT_FLAG_DECODING_PARAM |
| 460 | static const AVOption options[] = { |
| 461 | { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, |
| 462 | { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = "ntsc"}, 0, 0, DEC }, |
| 463 | { NULL }, |
| 464 | }; |
| 465 | |
| 466 | static const AVClass vfw_class = { |
| 467 | .class_name = "VFW indev", |
| 468 | .item_name = av_default_item_name, |
| 469 | .option = options, |
| 470 | .version = LIBAVUTIL_VERSION_INT, |
| 471 | .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT |
| 472 | }; |
| 473 | |
| 474 | AVInputFormat ff_vfwcap_demuxer = { |
| 475 | .name = "vfwcap", |
| 476 | .long_name = NULL_IF_CONFIG_SMALL("VfW video capture"), |
| 477 | .priv_data_size = sizeof(struct vfw_ctx), |
| 478 | .read_header = vfw_read_header, |
| 479 | .read_packet = vfw_read_packet, |
| 480 | .read_close = vfw_read_close, |
| 481 | .flags = AVFMT_NOFILE, |
| 482 | .priv_class = &vfw_class, |
| 483 | }; |