2 * VFW capture interface
3 * Copyright (c) 2006-2008 Ramiro Polla
5 * This file is part of Libav.
7 * Libav 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.
12 * Libav 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavformat/avformat.h"
23 #include "libavformat/internal.h"
24 #include "libavutil/log.h"
25 #include "libavutil/opt.h"
26 #include "libavutil/parseutils.h"
30 /* Defines for VFW missing from MinGW.
31 * Remove this when MinGW incorporates them. */
32 #define HWND_MESSAGE ((HWND)-3)
36 /* End of missing MinGW defines */
44 unsigned int curbufsize;
45 unsigned int frame_num;
46 char *video_size; /**< A string describing video size, set by a private option. */
47 char *framerate; /**< Set by a private option. */
50 static enum PixelFormat vfw_pixfmt(DWORD biCompression, WORD biBitCount)
52 switch(biCompression) {
53 case MKTAG('U', 'Y', 'V', 'Y'):
54 return PIX_FMT_UYVY422;
55 case MKTAG('Y', 'U', 'Y', '2'):
56 return PIX_FMT_YUYV422;
57 case MKTAG('I', '4', '2', '0'):
58 return PIX_FMT_YUV420P;
60 switch(biBitCount) { /* 1-8 are untested */
62 return PIX_FMT_MONOWHITE;
68 return PIX_FMT_RGB555;
78 static enum CodecID vfw_codecid(DWORD biCompression)
80 switch(biCompression) {
81 case MKTAG('d', 'v', 's', 'd'):
82 return CODEC_ID_DVVIDEO;
83 case MKTAG('M', 'J', 'P', 'G'):
84 case MKTAG('m', 'j', 'p', 'g'):
85 return CODEC_ID_MJPEG;
90 #define dstruct(pctx, sname, var, type) \
91 av_log(pctx, AV_LOG_DEBUG, #var":\t%"type"\n", sname->var)
93 static void dump_captureparms(AVFormatContext *s, CAPTUREPARMS *cparms)
95 av_log(s, AV_LOG_DEBUG, "CAPTUREPARMS\n");
96 dstruct(s, cparms, dwRequestMicroSecPerFrame, "lu");
97 dstruct(s, cparms, fMakeUserHitOKToCapture, "d");
98 dstruct(s, cparms, wPercentDropForError, "u");
99 dstruct(s, cparms, fYield, "d");
100 dstruct(s, cparms, dwIndexSize, "lu");
101 dstruct(s, cparms, wChunkGranularity, "u");
102 dstruct(s, cparms, fUsingDOSMemory, "d");
103 dstruct(s, cparms, wNumVideoRequested, "u");
104 dstruct(s, cparms, fCaptureAudio, "d");
105 dstruct(s, cparms, wNumAudioRequested, "u");
106 dstruct(s, cparms, vKeyAbort, "u");
107 dstruct(s, cparms, fAbortLeftMouse, "d");
108 dstruct(s, cparms, fAbortRightMouse, "d");
109 dstruct(s, cparms, fLimitEnabled, "d");
110 dstruct(s, cparms, wTimeLimit, "u");
111 dstruct(s, cparms, fMCIControl, "d");
112 dstruct(s, cparms, fStepMCIDevice, "d");
113 dstruct(s, cparms, dwMCIStartTime, "lu");
114 dstruct(s, cparms, dwMCIStopTime, "lu");
115 dstruct(s, cparms, fStepCaptureAt2x, "d");
116 dstruct(s, cparms, wStepCaptureAverageFrames, "u");
117 dstruct(s, cparms, dwAudioBufferSize, "lu");
118 dstruct(s, cparms, fDisableWriteCache, "d");
119 dstruct(s, cparms, AVStreamMaster, "u");
122 static void dump_videohdr(AVFormatContext *s, VIDEOHDR *vhdr)
125 av_log(s, AV_LOG_DEBUG, "VIDEOHDR\n");
126 dstruct(s, vhdr, lpData, "p");
127 dstruct(s, vhdr, dwBufferLength, "lu");
128 dstruct(s, vhdr, dwBytesUsed, "lu");
129 dstruct(s, vhdr, dwTimeCaptured, "lu");
130 dstruct(s, vhdr, dwUser, "lu");
131 dstruct(s, vhdr, dwFlags, "lu");
132 dstruct(s, vhdr, dwReserved[0], "lu");
133 dstruct(s, vhdr, dwReserved[1], "lu");
134 dstruct(s, vhdr, dwReserved[2], "lu");
135 dstruct(s, vhdr, dwReserved[3], "lu");
139 static void dump_bih(AVFormatContext *s, BITMAPINFOHEADER *bih)
141 av_log(s, AV_LOG_DEBUG, "BITMAPINFOHEADER\n");
142 dstruct(s, bih, biSize, "lu");
143 dstruct(s, bih, biWidth, "ld");
144 dstruct(s, bih, biHeight, "ld");
145 dstruct(s, bih, biPlanes, "d");
146 dstruct(s, bih, biBitCount, "d");
147 dstruct(s, bih, biCompression, "lu");
148 av_log(s, AV_LOG_DEBUG, " biCompression:\t\"%.4s\"\n",
149 (char*) &bih->biCompression);
150 dstruct(s, bih, biSizeImage, "lu");
151 dstruct(s, bih, biXPelsPerMeter, "lu");
152 dstruct(s, bih, biYPelsPerMeter, "lu");
153 dstruct(s, bih, biClrUsed, "lu");
154 dstruct(s, bih, biClrImportant, "lu");
157 static int shall_we_drop(AVFormatContext *s)
159 struct vfw_ctx *ctx = s->priv_data;
160 const uint8_t dropscore[] = {62, 75, 87, 100};
161 const int ndropscores = FF_ARRAY_ELEMS(dropscore);
162 unsigned int buffer_fullness = (ctx->curbufsize*100)/s->max_picture_buffer;
164 if(dropscore[++ctx->frame_num%ndropscores] <= buffer_fullness) {
165 av_log(s, AV_LOG_ERROR,
166 "real-time buffer %d%% full! frame dropped!\n", buffer_fullness);
173 static LRESULT CALLBACK videostream_cb(HWND hwnd, LPVIDEOHDR vdhdr)
177 AVPacketList **ppktl, *pktl_next;
179 s = (AVFormatContext *) GetWindowLongPtr(hwnd, GWLP_USERDATA);
182 dump_videohdr(s, vdhdr);
187 WaitForSingleObject(ctx->mutex, INFINITE);
189 pktl_next = av_mallocz(sizeof(AVPacketList));
193 if(av_new_packet(&pktl_next->pkt, vdhdr->dwBytesUsed) < 0) {
198 pktl_next->pkt.pts = vdhdr->dwTimeCaptured;
199 memcpy(pktl_next->pkt.data, vdhdr->lpData, vdhdr->dwBytesUsed);
201 for(ppktl = &ctx->pktl ; *ppktl ; ppktl = &(*ppktl)->next);
204 ctx->curbufsize += vdhdr->dwBytesUsed;
206 SetEvent(ctx->event);
207 ReleaseMutex(ctx->mutex);
211 ReleaseMutex(ctx->mutex);
215 static int vfw_read_close(AVFormatContext *s)
217 struct vfw_ctx *ctx = s->priv_data;
221 SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
222 SendMessage(ctx->hwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0);
223 DestroyWindow(ctx->hwnd);
226 CloseHandle(ctx->mutex);
228 CloseHandle(ctx->event);
232 AVPacketList *next = pktl->next;
233 av_destruct_packet(&pktl->pkt);
241 static int vfw_read_header(AVFormatContext *s)
243 struct vfw_ctx *ctx = s->priv_data;
244 AVCodecContext *codec;
253 AVRational framerate_q;
255 if (!strcmp(s->filename, "list")) {
256 for (devnum = 0; devnum <= 9; devnum++) {
257 char driver_name[256];
258 char driver_ver[256];
259 ret = capGetDriverDescription(devnum,
260 driver_name, sizeof(driver_name),
261 driver_ver, sizeof(driver_ver));
263 av_log(s, AV_LOG_INFO, "Driver %d\n", devnum);
264 av_log(s, AV_LOG_INFO, " %s\n", driver_name);
265 av_log(s, AV_LOG_INFO, " %s\n", driver_ver);
271 ctx->hwnd = capCreateCaptureWindow(NULL, 0, 0, 0, 0, 0, HWND_MESSAGE, 0);
273 av_log(s, AV_LOG_ERROR, "Could not create capture window.\n");
277 /* If atoi fails, devnum==0 and the default device is used */
278 devnum = atoi(s->filename);
280 ret = SendMessage(ctx->hwnd, WM_CAP_DRIVER_CONNECT, devnum, 0);
282 av_log(s, AV_LOG_ERROR, "Could not connect to device.\n");
283 DestroyWindow(ctx->hwnd);
284 return AVERROR(ENODEV);
287 SendMessage(ctx->hwnd, WM_CAP_SET_OVERLAY, 0, 0);
288 SendMessage(ctx->hwnd, WM_CAP_SET_PREVIEW, 0, 0);
290 ret = SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0,
291 (LPARAM) videostream_cb);
293 av_log(s, AV_LOG_ERROR, "Could not set video stream callback.\n");
297 SetWindowLongPtr(ctx->hwnd, GWLP_USERDATA, (LONG_PTR) s);
299 st = avformat_new_stream(s, NULL);
302 return AVERROR(ENOMEM);
305 /* Set video format */
306 bisize = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, 0, 0);
309 bi = av_malloc(bisize);
312 return AVERROR(ENOMEM);
314 ret = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, bisize, (LPARAM) bi);
318 dump_bih(s, &bi->bmiHeader);
321 if (ctx->video_size) {
322 ret = av_parse_video_size(&bi->bmiHeader.biWidth, &bi->bmiHeader.biHeight, ctx->video_size);
324 av_log(s, AV_LOG_ERROR, "Couldn't parse video size.\n");
330 /* For testing yet unsupported compressions
331 * Copy these values from user-supplied verbose information */
332 bi->bmiHeader.biWidth = 320;
333 bi->bmiHeader.biHeight = 240;
334 bi->bmiHeader.biPlanes = 1;
335 bi->bmiHeader.biBitCount = 12;
336 bi->bmiHeader.biCompression = MKTAG('I','4','2','0');
337 bi->bmiHeader.biSizeImage = 115200;
338 dump_bih(s, &bi->bmiHeader);
341 ret = SendMessage(ctx->hwnd, WM_CAP_SET_VIDEOFORMAT, bisize, (LPARAM) bi);
343 av_log(s, AV_LOG_ERROR, "Could not set Video Format.\n");
347 biCompression = bi->bmiHeader.biCompression;
348 biBitCount = bi->bmiHeader.biBitCount;
352 /* Set sequence setup */
353 ret = SendMessage(ctx->hwnd, WM_CAP_GET_SEQUENCE_SETUP, sizeof(cparms),
358 dump_captureparms(s, &cparms);
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;
368 ret = SendMessage(ctx->hwnd, WM_CAP_SET_SEQUENCE_SETUP, sizeof(cparms),
374 codec->time_base = (AVRational){framerate_q.den, framerate_q.num};
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 == PIX_FMT_NONE) {
380 codec->codec_id = vfw_codecid(biCompression);
381 if(codec->codec_id == CODEC_ID_NONE) {
382 av_log(s, AV_LOG_ERROR, "Unknown compression type. "
383 "Please report verbose (-v 9) debug information.\n");
385 return AVERROR_PATCHWELCOME;
387 codec->bits_per_coded_sample = biBitCount;
389 codec->codec_id = 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);
400 avpriv_set_pts_info(st, 32, 1, 1000);
402 ctx->mutex = CreateMutex(NULL, 0, NULL);
404 av_log(s, AV_LOG_ERROR, "Could not create Mutex.\n" );
407 ctx->event = CreateEvent(NULL, 1, 0, NULL);
409 av_log(s, AV_LOG_ERROR, "Could not create Event.\n" );
413 ret = SendMessage(ctx->hwnd, WM_CAP_SEQUENCE_NOFILE, 0, 0);
415 av_log(s, AV_LOG_ERROR, "Could not start capture sequence.\n" );
429 static int vfw_read_packet(AVFormatContext *s, AVPacket *pkt)
431 struct vfw_ctx *ctx = s->priv_data;
432 AVPacketList *pktl = NULL;
435 WaitForSingleObject(ctx->mutex, INFINITE);
438 *pkt = ctx->pktl->pkt;
439 ctx->pktl = ctx->pktl->next;
442 ResetEvent(ctx->event);
443 ReleaseMutex(ctx->mutex);
445 if(s->flags & AVFMT_FLAG_NONBLOCK) {
446 return AVERROR(EAGAIN);
448 WaitForSingleObject(ctx->event, INFINITE);
453 ctx->curbufsize -= pkt->size;
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 },
466 static const AVClass vfw_class = {
467 .class_name = "VFW indev",
468 .item_name = av_default_item_name,
470 .version = LIBAVUTIL_VERSION_INT,
473 AVInputFormat ff_vfwcap_demuxer = {
475 .long_name = NULL_IF_CONFIG_SMALL("VfW video capture"),
476 .priv_data_size = sizeof(struct vfw_ctx),
477 .read_header = vfw_read_header,
478 .read_packet = vfw_read_packet,
479 .read_close = vfw_read_close,
480 .flags = AVFMT_NOFILE,
481 .priv_class = &vfw_class,