2 * Directshow capture interface
3 * Copyright (c) 2010 Ramiro Polla
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/parseutils.h"
23 #include "libavutil/opt.h"
34 int video_device_number;
35 int audio_device_number;
40 IBaseFilter *device_filter[2];
42 libAVFilter *capture_filter[2];
43 libAVPin *capture_pin[2];
49 unsigned int curbufsize;
50 unsigned int video_frame_num;
52 IMediaControl *control;
59 AVRational requested_framerate;
66 static enum PixelFormat dshow_pixfmt(DWORD biCompression, WORD biBitCount)
68 switch(biCompression) {
69 case MKTAG('U', 'Y', 'V', 'Y'):
70 return PIX_FMT_UYVY422;
71 case MKTAG('Y', 'U', 'Y', '2'):
72 return PIX_FMT_YUYV422;
73 case MKTAG('I', '4', '2', '0'):
74 return PIX_FMT_YUV420P;
76 switch(biBitCount) { /* 1-8 are untested */
78 return PIX_FMT_MONOWHITE;
84 return PIX_FMT_RGB555;
94 static enum CodecID dshow_codecid(DWORD biCompression)
96 switch(biCompression) {
97 case MKTAG('d', 'v', 's', 'd'):
98 return CODEC_ID_DVVIDEO;
99 case MKTAG('M', 'J', 'P', 'G'):
100 case MKTAG('m', 'j', 'p', 'g'):
101 return CODEC_ID_MJPEG;
103 return CODEC_ID_NONE;
107 dshow_read_close(AVFormatContext *s)
109 struct dshow_ctx *ctx = s->priv_data;
113 IMediaControl_Stop(ctx->control);
114 IMediaControl_Release(ctx->control);
120 r = IGraphBuilder_EnumFilters(ctx->graph, &fenum);
123 IEnumFilters_Reset(fenum);
124 while (IEnumFilters_Next(fenum, 1, &f, NULL) == S_OK) {
125 if (IGraphBuilder_RemoveFilter(ctx->graph, f) == S_OK)
126 IEnumFilters_Reset(fenum); /* When a filter is removed,
127 * the list must be reset. */
128 IBaseFilter_Release(f);
130 IEnumFilters_Release(fenum);
132 IGraphBuilder_Release(ctx->graph);
135 if (ctx->capture_pin[VideoDevice])
136 libAVPin_Release(ctx->capture_pin[VideoDevice]);
137 if (ctx->capture_pin[AudioDevice])
138 libAVPin_Release(ctx->capture_pin[AudioDevice]);
139 if (ctx->capture_filter[VideoDevice])
140 libAVFilter_Release(ctx->capture_filter[VideoDevice]);
141 if (ctx->capture_filter[AudioDevice])
142 libAVFilter_Release(ctx->capture_filter[AudioDevice]);
144 if (ctx->device_pin[VideoDevice])
145 IPin_Release(ctx->device_pin[VideoDevice]);
146 if (ctx->device_pin[AudioDevice])
147 IPin_Release(ctx->device_pin[AudioDevice]);
148 if (ctx->device_filter[VideoDevice])
149 IBaseFilter_Release(ctx->device_filter[VideoDevice]);
150 if (ctx->device_filter[AudioDevice])
151 IBaseFilter_Release(ctx->device_filter[AudioDevice]);
153 if (ctx->device_name[0])
154 av_free(ctx->device_name[0]);
155 if (ctx->device_name[1])
156 av_free(ctx->device_name[1]);
159 CloseHandle(ctx->mutex);
161 CloseHandle(ctx->event);
165 AVPacketList *next = pktl->next;
166 av_destruct_packet(&pktl->pkt);
174 static char *dup_wchar_to_utf8(wchar_t *w)
177 int l = WideCharToMultiByte(CP_UTF8, 0, w, -1, 0, 0, 0, 0);
180 WideCharToMultiByte(CP_UTF8, 0, w, -1, s, l, 0, 0);
184 static int shall_we_drop(AVFormatContext *s)
186 struct dshow_ctx *ctx = s->priv_data;
187 const uint8_t dropscore[] = {62, 75, 87, 100};
188 const int ndropscores = FF_ARRAY_ELEMS(dropscore);
189 unsigned int buffer_fullness = (ctx->curbufsize*100)/s->max_picture_buffer;
191 if(dropscore[++ctx->video_frame_num%ndropscores] <= buffer_fullness) {
192 av_log(s, AV_LOG_ERROR,
193 "real-time buffer %d%% full! frame dropped!\n", buffer_fullness);
201 callback(void *priv_data, int index, uint8_t *buf, int buf_size, int64_t time)
203 AVFormatContext *s = priv_data;
204 struct dshow_ctx *ctx = s->priv_data;
205 AVPacketList **ppktl, *pktl_next;
207 // dump_videohdr(s, vdhdr);
212 WaitForSingleObject(ctx->mutex, INFINITE);
214 pktl_next = av_mallocz(sizeof(AVPacketList));
218 if(av_new_packet(&pktl_next->pkt, buf_size) < 0) {
223 pktl_next->pkt.stream_index = index;
224 pktl_next->pkt.pts = time;
225 memcpy(pktl_next->pkt.data, buf, buf_size);
227 for(ppktl = &ctx->pktl ; *ppktl ; ppktl = &(*ppktl)->next);
230 ctx->curbufsize += buf_size;
232 SetEvent(ctx->event);
233 ReleaseMutex(ctx->mutex);
237 ReleaseMutex(ctx->mutex);
242 * Cycle through available devices using the device enumerator devenum,
243 * retrieve the device with type specified by devtype and return the
244 * pointer to the object found in *pfilter.
245 * If pfilter is NULL, list all device names.
248 dshow_cycle_devices(AVFormatContext *avctx, ICreateDevEnum *devenum,
249 enum dshowDeviceType devtype, IBaseFilter **pfilter)
251 struct dshow_ctx *ctx = avctx->priv_data;
252 IBaseFilter *device_filter = NULL;
253 IEnumMoniker *classenum = NULL;
255 const char *device_name = ctx->device_name[devtype];
256 int skip = (devtype == VideoDevice) ? ctx->video_device_number
257 : ctx->audio_device_number;
260 const GUID *device_guid[2] = { &CLSID_VideoInputDeviceCategory,
261 &CLSID_AudioInputDeviceCategory };
262 const char *devtypename = (devtype == VideoDevice) ? "video" : "audio";
264 r = ICreateDevEnum_CreateClassEnumerator(devenum, device_guid[devtype],
265 (IEnumMoniker **) &classenum, 0);
267 av_log(avctx, AV_LOG_ERROR, "Could not enumerate %s devices.\n",
272 while (!device_filter && IEnumMoniker_Next(classenum, 1, &m, NULL) == S_OK) {
273 IPropertyBag *bag = NULL;
277 r = IMoniker_BindToStorage(m, 0, 0, &IID_IPropertyBag, (void *) &bag);
282 r = IPropertyBag_Read(bag, L"FriendlyName", &var, NULL);
286 buf = dup_wchar_to_utf8(var.bstrVal);
289 if (strcmp(device_name, buf))
293 IMoniker_BindToObject(m, 0, 0, &IID_IBaseFilter, (void *) &device_filter);
295 av_log(avctx, AV_LOG_INFO, " \"%s\"\n", buf);
302 IPropertyBag_Release(bag);
306 IEnumMoniker_Release(classenum);
309 if (!device_filter) {
310 av_log(avctx, AV_LOG_ERROR, "Could not find %s device.\n",
314 *pfilter = device_filter;
321 * Cycle through available formats using the specified pin,
322 * try to set parameters specified through AVOptions and if successful
323 * return 1 in *pformat_set.
324 * If pformat_set is NULL, list all pin capabilities.
327 dshow_cycle_formats(AVFormatContext *avctx, enum dshowDeviceType devtype,
328 IPin *pin, int *pformat_set)
330 struct dshow_ctx *ctx = avctx->priv_data;
331 IAMStreamConfig *config = NULL;
332 AM_MEDIA_TYPE *type = NULL;
337 if (IPin_QueryInterface(pin, &IID_IAMStreamConfig, (void **) &config) != S_OK)
339 if (IAMStreamConfig_GetNumberOfCapabilities(config, &n, &size) != S_OK)
342 caps = av_malloc(size);
346 for (i = 0; i < n && !format_set; i++) {
347 IAMStreamConfig_GetStreamCaps(config, i, &type, (void *) caps);
350 ff_print_AM_MEDIA_TYPE(type);
353 if (devtype == VideoDevice) {
354 VIDEO_STREAM_CONFIG_CAPS *vcaps = caps;
355 BITMAPINFOHEADER *bih;
358 ff_print_VIDEO_STREAM_CONFIG_CAPS(vcaps);
360 if (IsEqualGUID(&type->formattype, &FORMAT_VideoInfo)) {
361 VIDEOINFOHEADER *v = (void *) type->pbFormat;
362 fr = &v->AvgTimePerFrame;
364 } else if (IsEqualGUID(&type->formattype, &FORMAT_VideoInfo2)) {
365 VIDEOINFOHEADER2 *v = (void *) type->pbFormat;
366 fr = &v->AvgTimePerFrame;
372 av_log(avctx, AV_LOG_INFO, " min s=%ldx%ld fps=%g max s=%ldx%ld fps=%g\n",
373 vcaps->MinOutputSize.cx, vcaps->MinOutputSize.cy,
374 1e7 / vcaps->MaxFrameInterval,
375 vcaps->MaxOutputSize.cx, vcaps->MaxOutputSize.cy,
376 1e7 / vcaps->MinFrameInterval);
379 if (ctx->framerate) {
380 int64_t framerate = ((int64_t) ctx->requested_framerate.den*10000000)
381 / ctx->requested_framerate.num;
382 if (framerate > vcaps->MaxFrameInterval ||
383 framerate < vcaps->MinFrameInterval)
387 if (ctx->video_size) {
388 if (ctx->requested_width > vcaps->MaxOutputSize.cx ||
389 ctx->requested_width < vcaps->MinOutputSize.cx ||
390 ctx->requested_height > vcaps->MaxOutputSize.cy ||
391 ctx->requested_height < vcaps->MinOutputSize.cy)
393 bih->biWidth = ctx->requested_width;
394 bih->biHeight = ctx->requested_height;
397 AUDIO_STREAM_CONFIG_CAPS *acaps = caps;
400 ff_print_AUDIO_STREAM_CONFIG_CAPS(acaps);
402 if (IsEqualGUID(&type->formattype, &FORMAT_WaveFormatEx)) {
403 fx = (void *) type->pbFormat;
408 av_log(avctx, AV_LOG_INFO, " min ch=%lu bits=%lu rate=%6lu max ch=%lu bits=%lu rate=%6lu\n",
409 acaps->MinimumChannels, acaps->MinimumBitsPerSample, acaps->MinimumSampleFrequency,
410 acaps->MaximumChannels, acaps->MaximumBitsPerSample, acaps->MaximumSampleFrequency);
413 if (ctx->sample_rate) {
414 if (ctx->sample_rate > acaps->MaximumSampleFrequency ||
415 ctx->sample_rate < acaps->MinimumSampleFrequency)
417 fx->nSamplesPerSec = ctx->sample_rate;
419 if (ctx->sample_size) {
420 if (ctx->sample_size > acaps->MaximumBitsPerSample ||
421 ctx->sample_size < acaps->MinimumBitsPerSample)
423 fx->wBitsPerSample = ctx->sample_size;
426 if (ctx->channels > acaps->MaximumChannels ||
427 ctx->channels < acaps->MinimumChannels)
429 fx->nChannels = ctx->channels;
432 if (IAMStreamConfig_SetFormat(config, type) != S_OK)
437 CoTaskMemFree(type->pbFormat);
441 IAMStreamConfig_Release(config);
445 *pformat_set = format_set;
449 * Cycle through available pins using the device_filter device, of type
450 * devtype, retrieve the first output pin and return the pointer to the
451 * object found in *ppin.
452 * If ppin is NULL, cycle through all pins listing audio/video capabilities.
455 dshow_cycle_pins(AVFormatContext *avctx, enum dshowDeviceType devtype,
456 IBaseFilter *device_filter, IPin **ppin)
458 struct dshow_ctx *ctx = avctx->priv_data;
460 IPin *device_pin = NULL;
464 const GUID *mediatype[2] = { &MEDIATYPE_Video, &MEDIATYPE_Audio };
465 const char *devtypename = (devtype == VideoDevice) ? "video" : "audio";
467 int set_format = (devtype == VideoDevice && (ctx->video_size || ctx->framerate))
468 || (devtype == AudioDevice && (ctx->channels || ctx->sample_rate));
471 r = IBaseFilter_EnumPins(device_filter, &pins);
473 av_log(avctx, AV_LOG_ERROR, "Could not enumerate pins.\n");
478 av_log(avctx, AV_LOG_INFO, "DirectShow %s device options\n",
481 while (!device_pin && IEnumPins_Next(pins, 1, &pin, NULL) == S_OK) {
482 IKsPropertySet *p = NULL;
483 IEnumMediaTypes *types = NULL;
489 IPin_QueryPinInfo(pin, &info);
490 IBaseFilter_Release(info.pFilter);
492 if (info.dir != PINDIR_OUTPUT)
494 if (IPin_QueryInterface(pin, &IID_IKsPropertySet, (void **) &p) != S_OK)
496 if (IKsPropertySet_Get(p, &ROPSETID_Pin, AMPROPERTY_PIN_CATEGORY,
497 NULL, 0, &category, sizeof(GUID), &r2) != S_OK)
499 if (!IsEqualGUID(&category, &PIN_CATEGORY_CAPTURE))
503 char *buf = dup_wchar_to_utf8(info.achName);
504 av_log(avctx, AV_LOG_INFO, " Pin \"%s\"\n", buf);
506 dshow_cycle_formats(avctx, devtype, pin, NULL);
510 dshow_cycle_formats(avctx, devtype, pin, &format_set);
516 if (IPin_EnumMediaTypes(pin, &types) != S_OK)
519 IEnumMediaTypes_Reset(types);
520 while (!device_pin && IEnumMediaTypes_Next(types, 1, &type, NULL) == S_OK) {
521 if (IsEqualGUID(&type->majortype, mediatype[devtype])) {
530 IEnumMediaTypes_Release(types);
532 IKsPropertySet_Release(p);
533 if (device_pin != pin)
537 IEnumPins_Release(pins);
540 if (set_format && !format_set) {
541 av_log(avctx, AV_LOG_ERROR, "Could not set %s options\n", devtypename);
545 av_log(avctx, AV_LOG_ERROR,
546 "Could not find output pin from %s capture device.\n", devtypename);
556 * List options for device with type devtype.
558 * @param devenum device enumerator used for accessing the device
561 dshow_list_device_options(AVFormatContext *avctx, ICreateDevEnum *devenum,
562 enum dshowDeviceType devtype)
564 struct dshow_ctx *ctx = avctx->priv_data;
565 IBaseFilter *device_filter = NULL;
568 if ((r = dshow_cycle_devices(avctx, devenum, devtype, &device_filter)) < 0)
570 ctx->device_filter[devtype] = device_filter;
571 if ((r = dshow_cycle_pins(avctx, devtype, device_filter, NULL)) < 0)
578 dshow_open_device(AVFormatContext *avctx, ICreateDevEnum *devenum,
579 enum dshowDeviceType devtype)
581 struct dshow_ctx *ctx = avctx->priv_data;
582 IBaseFilter *device_filter = NULL;
583 IGraphBuilder *graph = ctx->graph;
584 IPin *device_pin = NULL;
585 libAVPin *capture_pin = NULL;
586 libAVFilter *capture_filter = NULL;
587 int ret = AVERROR(EIO);
590 const wchar_t *filter_name[2] = { L"Audio capture filter", L"Video capture filter" };
592 if ((r = dshow_cycle_devices(avctx, devenum, devtype, &device_filter)) < 0) {
597 ctx->device_filter [devtype] = device_filter;
599 r = IGraphBuilder_AddFilter(graph, device_filter, NULL);
601 av_log(avctx, AV_LOG_ERROR, "Could not add device filter to graph.\n");
605 if ((r = dshow_cycle_pins(avctx, devtype, device_filter, &device_pin)) < 0) {
609 ctx->device_pin[devtype] = device_pin;
611 capture_filter = libAVFilter_Create(avctx, callback, devtype);
612 if (!capture_filter) {
613 av_log(avctx, AV_LOG_ERROR, "Could not create grabber filter.\n");
616 ctx->capture_filter[devtype] = capture_filter;
618 r = IGraphBuilder_AddFilter(graph, (IBaseFilter *) capture_filter,
619 filter_name[devtype]);
621 av_log(avctx, AV_LOG_ERROR, "Could not add capture filter to graph\n");
625 libAVPin_AddRef(capture_filter->pin);
626 capture_pin = capture_filter->pin;
627 ctx->capture_pin[devtype] = capture_pin;
629 r = IGraphBuilder_ConnectDirect(graph, device_pin, (IPin *) capture_pin, NULL);
631 av_log(avctx, AV_LOG_ERROR, "Could not connect pins\n");
641 static enum CodecID waveform_codec_id(enum AVSampleFormat sample_fmt)
643 switch (sample_fmt) {
644 case AV_SAMPLE_FMT_U8: return CODEC_ID_PCM_U8;
645 case AV_SAMPLE_FMT_S16: return CODEC_ID_PCM_S16LE;
646 case AV_SAMPLE_FMT_S32: return CODEC_ID_PCM_S32LE;
647 default: return CODEC_ID_NONE; /* Should never happen. */
651 static enum SampleFormat sample_fmt_bits_per_sample(int bits)
654 case 8: return AV_SAMPLE_FMT_U8;
655 case 16: return AV_SAMPLE_FMT_S16;
656 case 32: return AV_SAMPLE_FMT_S32;
657 default: return AV_SAMPLE_FMT_NONE; /* Should never happen. */
662 dshow_add_device(AVFormatContext *avctx, AVFormatParameters *ap,
663 enum dshowDeviceType devtype)
665 struct dshow_ctx *ctx = avctx->priv_data;
667 AVCodecContext *codec;
669 int ret = AVERROR(EIO);
671 st = avformat_new_stream(avctx, NULL);
673 ret = AVERROR(ENOMEM);
678 ctx->capture_filter[devtype]->stream_index = st->index;
680 libAVPin_ConnectionMediaType(ctx->capture_pin[devtype], &type);
683 if (devtype == VideoDevice) {
684 BITMAPINFOHEADER *bih = NULL;
686 if (IsEqualGUID(&type.formattype, &FORMAT_VideoInfo)) {
687 VIDEOINFOHEADER *v = (void *) type.pbFormat;
689 } else if (IsEqualGUID(&type.formattype, &FORMAT_VideoInfo2)) {
690 VIDEOINFOHEADER2 *v = (void *) type.pbFormat;
694 av_log(avctx, AV_LOG_ERROR, "Could not get media type.\n");
698 codec->time_base = ap->time_base;
699 codec->codec_type = AVMEDIA_TYPE_VIDEO;
700 codec->width = bih->biWidth;
701 codec->height = bih->biHeight;
702 codec->pix_fmt = dshow_pixfmt(bih->biCompression, bih->biBitCount);
703 if (codec->pix_fmt == PIX_FMT_NONE) {
704 codec->codec_id = dshow_codecid(bih->biCompression);
705 if (codec->codec_id == CODEC_ID_NONE) {
706 av_log(avctx, AV_LOG_ERROR, "Unknown compression type. "
707 "Please report verbose (-v 9) debug information.\n");
708 dshow_read_close(avctx);
709 return AVERROR_PATCHWELCOME;
711 codec->bits_per_coded_sample = bih->biBitCount;
713 codec->codec_id = CODEC_ID_RAWVIDEO;
714 if (bih->biCompression == BI_RGB) {
715 codec->bits_per_coded_sample = bih->biBitCount;
716 codec->extradata = av_malloc(9 + FF_INPUT_BUFFER_PADDING_SIZE);
717 if (codec->extradata) {
718 codec->extradata_size = 9;
719 memcpy(codec->extradata, "BottomUp", 9);
724 WAVEFORMATEX *fx = NULL;
726 if (IsEqualGUID(&type.formattype, &FORMAT_WaveFormatEx)) {
727 fx = (void *) type.pbFormat;
730 av_log(avctx, AV_LOG_ERROR, "Could not get media type.\n");
734 codec->codec_type = AVMEDIA_TYPE_AUDIO;
735 codec->sample_fmt = sample_fmt_bits_per_sample(fx->wBitsPerSample);
736 codec->codec_id = waveform_codec_id(codec->sample_fmt);
737 codec->sample_rate = fx->nSamplesPerSec;
738 codec->channels = fx->nChannels;
741 av_set_pts_info(st, 64, 1, 10000000);
749 static int parse_device_name(AVFormatContext *avctx)
751 struct dshow_ctx *ctx = avctx->priv_data;
752 char **device_name = ctx->device_name;
753 char *name = av_strdup(avctx->filename);
758 while ((type = strtok(tmp, "="))) {
759 char *token = strtok(NULL, ":");
762 if (!strcmp(type, "video")) {
763 device_name[0] = token;
764 } else if (!strcmp(type, "audio")) {
765 device_name[1] = token;
767 device_name[0] = NULL;
768 device_name[1] = NULL;
773 if (!device_name[0] && !device_name[1]) {
777 device_name[0] = av_strdup(device_name[0]);
779 device_name[1] = av_strdup(device_name[1]);
786 static int dshow_read_header(AVFormatContext *avctx, AVFormatParameters *ap)
788 struct dshow_ctx *ctx = avctx->priv_data;
789 IGraphBuilder *graph = NULL;
790 ICreateDevEnum *devenum = NULL;
791 IMediaControl *control = NULL;
792 int ret = AVERROR(EIO);
795 if (!ctx->list_devices && !parse_device_name(avctx)) {
796 av_log(avctx, AV_LOG_ERROR, "Malformed dshow input string.\n");
800 if (ctx->video_size) {
801 r = av_parse_video_size(&ctx->requested_width, &ctx->requested_height, ctx->video_size);
803 av_log(avctx, AV_LOG_ERROR, "Could not parse video size '%s'.\n", ctx->video_size);
807 if (ctx->framerate) {
808 r = av_parse_video_rate(&ctx->requested_framerate, ctx->framerate);
810 av_log(avctx, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", ctx->framerate);
817 r = CoCreateInstance(&CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER,
818 &IID_IGraphBuilder, (void **) &graph);
820 av_log(avctx, AV_LOG_ERROR, "Could not create capture graph.\n");
825 r = CoCreateInstance(&CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER,
826 &IID_ICreateDevEnum, (void **) &devenum);
828 av_log(avctx, AV_LOG_ERROR, "Could not enumerate system devices.\n");
832 if (ctx->list_devices) {
833 av_log(avctx, AV_LOG_INFO, "DirectShow video devices\n");
834 dshow_cycle_devices(avctx, devenum, VideoDevice, NULL);
835 av_log(avctx, AV_LOG_INFO, "DirectShow audio devices\n");
836 dshow_cycle_devices(avctx, devenum, AudioDevice, NULL);
840 if (ctx->list_options) {
841 if (ctx->device_name[VideoDevice])
842 dshow_list_device_options(avctx, devenum, VideoDevice);
843 if (ctx->device_name[AudioDevice])
844 dshow_list_device_options(avctx, devenum, AudioDevice);
849 if (ctx->device_name[VideoDevice]) {
850 ret = dshow_open_device(avctx, devenum, VideoDevice);
853 ret = dshow_add_device(avctx, ap, VideoDevice);
857 if (ctx->device_name[AudioDevice]) {
858 ret = dshow_open_device(avctx, devenum, AudioDevice);
861 ret = dshow_add_device(avctx, ap, AudioDevice);
866 ctx->mutex = CreateMutex(NULL, 0, NULL);
868 av_log(avctx, AV_LOG_ERROR, "Could not create Mutex\n");
871 ctx->event = CreateEvent(NULL, 1, 0, NULL);
873 av_log(avctx, AV_LOG_ERROR, "Could not create Event\n");
877 r = IGraphBuilder_QueryInterface(graph, &IID_IMediaControl, (void **) &control);
879 av_log(avctx, AV_LOG_ERROR, "Could not get media control.\n");
882 ctx->control = control;
884 r = IMediaControl_Run(control);
887 r = IMediaControl_GetState(control, 0, &pfs);
890 av_log(avctx, AV_LOG_ERROR, "Could not run filter\n");
899 dshow_read_close(avctx);
902 ICreateDevEnum_Release(devenum);
907 static int dshow_read_packet(AVFormatContext *s, AVPacket *pkt)
909 struct dshow_ctx *ctx = s->priv_data;
910 AVPacketList *pktl = NULL;
913 WaitForSingleObject(ctx->mutex, INFINITE);
916 *pkt = ctx->pktl->pkt;
917 ctx->pktl = ctx->pktl->next;
920 ResetEvent(ctx->event);
921 ReleaseMutex(ctx->mutex);
923 if (s->flags & AVFMT_FLAG_NONBLOCK) {
924 return AVERROR(EAGAIN);
926 WaitForSingleObject(ctx->event, INFINITE);
931 ctx->curbufsize -= pkt->size;
936 #define OFFSET(x) offsetof(struct dshow_ctx, x)
937 #define DEC AV_OPT_FLAG_DECODING_PARAM
938 static const AVOption options[] = {
939 { "video_size", "set video size given a string such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
940 { "framerate", "set video frame rate", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
941 { "sample_rate", "set audio sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, DEC },
942 { "sample_size", "set audio sample size", OFFSET(sample_size), AV_OPT_TYPE_INT, {.dbl = 0}, 0, 16, DEC },
943 { "channels", "set number of audio channels, such as 1 or 2", OFFSET(channels), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, DEC },
944 { "list_devices", "list available devices", OFFSET(list_devices), AV_OPT_TYPE_INT, {.dbl=0}, 0, 1, DEC, "list_devices" },
945 { "true", "", 0, AV_OPT_TYPE_CONST, {.dbl=1}, 0, 0, DEC, "list_devices" },
946 { "false", "", 0, AV_OPT_TYPE_CONST, {.dbl=0}, 0, 0, DEC, "list_devices" },
947 { "list_options", "list available options for specified device", OFFSET(list_options), AV_OPT_TYPE_INT, {.dbl=0}, 0, 1, DEC, "list_options" },
948 { "true", "", 0, AV_OPT_TYPE_CONST, {.dbl=1}, 0, 0, DEC, "list_options" },
949 { "false", "", 0, AV_OPT_TYPE_CONST, {.dbl=0}, 0, 0, DEC, "list_options" },
950 { "video_device_number", "set video device number for devices with same name (starts at 0)", OFFSET(video_device_number), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, DEC },
951 { "audio_device_number", "set audio device number for devices with same name (starts at 0)", OFFSET(audio_device_number), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, DEC },
955 static const AVClass dshow_class = {
956 .class_name = "DirectShow indev",
957 .item_name = av_default_item_name,
959 .version = LIBAVUTIL_VERSION_INT,
962 AVInputFormat ff_dshow_demuxer = {
964 NULL_IF_CONFIG_SMALL("DirectShow capture"),
965 sizeof(struct dshow_ctx),
970 .flags = AVFMT_NOFILE,
971 .priv_class = &dshow_class,