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 IEnumFilters_Release(fenum);
130 IGraphBuilder_Release(ctx->graph);
133 if (ctx->capture_pin[VideoDevice])
134 libAVPin_Release(ctx->capture_pin[VideoDevice]);
135 if (ctx->capture_pin[AudioDevice])
136 libAVPin_Release(ctx->capture_pin[AudioDevice]);
137 if (ctx->capture_filter[VideoDevice])
138 libAVFilter_Release(ctx->capture_filter[VideoDevice]);
139 if (ctx->capture_filter[AudioDevice])
140 libAVFilter_Release(ctx->capture_filter[AudioDevice]);
142 if (ctx->device_pin[VideoDevice])
143 IPin_Release(ctx->device_pin[VideoDevice]);
144 if (ctx->device_pin[AudioDevice])
145 IPin_Release(ctx->device_pin[AudioDevice]);
146 if (ctx->device_filter[VideoDevice])
147 IBaseFilter_Release(ctx->device_filter[VideoDevice]);
148 if (ctx->device_filter[AudioDevice])
149 IBaseFilter_Release(ctx->device_filter[AudioDevice]);
151 if (ctx->device_name[0])
152 av_free(ctx->device_name[0]);
153 if (ctx->device_name[1])
154 av_free(ctx->device_name[1]);
157 CloseHandle(ctx->mutex);
159 CloseHandle(ctx->event);
163 AVPacketList *next = pktl->next;
164 av_destruct_packet(&pktl->pkt);
172 static char *dup_wchar_to_utf8(wchar_t *w)
175 int l = WideCharToMultiByte(CP_UTF8, 0, w, -1, 0, 0, 0, 0);
178 WideCharToMultiByte(CP_UTF8, 0, w, -1, s, l, 0, 0);
182 static int shall_we_drop(AVFormatContext *s)
184 struct dshow_ctx *ctx = s->priv_data;
185 const uint8_t dropscore[] = {62, 75, 87, 100};
186 const int ndropscores = FF_ARRAY_ELEMS(dropscore);
187 unsigned int buffer_fullness = (ctx->curbufsize*100)/s->max_picture_buffer;
189 if(dropscore[++ctx->video_frame_num%ndropscores] <= buffer_fullness) {
190 av_log(s, AV_LOG_ERROR,
191 "real-time buffer %d%% full! frame dropped!\n", buffer_fullness);
199 callback(void *priv_data, int index, uint8_t *buf, int buf_size, int64_t time)
201 AVFormatContext *s = priv_data;
202 struct dshow_ctx *ctx = s->priv_data;
203 AVPacketList **ppktl, *pktl_next;
205 // dump_videohdr(s, vdhdr);
210 WaitForSingleObject(ctx->mutex, INFINITE);
212 pktl_next = av_mallocz(sizeof(AVPacketList));
216 if(av_new_packet(&pktl_next->pkt, buf_size) < 0) {
221 pktl_next->pkt.stream_index = index;
222 pktl_next->pkt.pts = time;
223 memcpy(pktl_next->pkt.data, buf, buf_size);
225 for(ppktl = &ctx->pktl ; *ppktl ; ppktl = &(*ppktl)->next);
228 ctx->curbufsize += buf_size;
230 SetEvent(ctx->event);
231 ReleaseMutex(ctx->mutex);
235 ReleaseMutex(ctx->mutex);
240 * Cycle through available devices using the device enumerator devenum,
241 * retrieve the device with type specified by devtype and return the
242 * pointer to the object found in *pfilter.
243 * If pfilter is NULL, list all device names.
246 dshow_cycle_devices(AVFormatContext *avctx, ICreateDevEnum *devenum,
247 enum dshowDeviceType devtype, IBaseFilter **pfilter)
249 struct dshow_ctx *ctx = avctx->priv_data;
250 IBaseFilter *device_filter = NULL;
251 IEnumMoniker *classenum = NULL;
253 const char *device_name = ctx->device_name[devtype];
254 int skip = (devtype == VideoDevice) ? ctx->video_device_number
255 : ctx->audio_device_number;
258 const GUID *device_guid[2] = { &CLSID_VideoInputDeviceCategory,
259 &CLSID_AudioInputDeviceCategory };
260 const char *devtypename = (devtype == VideoDevice) ? "video" : "audio";
262 r = ICreateDevEnum_CreateClassEnumerator(devenum, device_guid[devtype],
263 (IEnumMoniker **) &classenum, 0);
265 av_log(avctx, AV_LOG_ERROR, "Could not enumerate %s devices.\n",
270 while (!device_filter && IEnumMoniker_Next(classenum, 1, &m, NULL) == S_OK) {
271 IPropertyBag *bag = NULL;
275 r = IMoniker_BindToStorage(m, 0, 0, &IID_IPropertyBag, (void *) &bag);
280 r = IPropertyBag_Read(bag, L"FriendlyName", &var, NULL);
284 buf = dup_wchar_to_utf8(var.bstrVal);
287 if (strcmp(device_name, buf))
291 IMoniker_BindToObject(m, 0, 0, &IID_IBaseFilter, (void *) &device_filter);
293 av_log(avctx, AV_LOG_INFO, " \"%s\"\n", buf);
300 IPropertyBag_Release(bag);
304 IEnumMoniker_Release(classenum);
307 if (!device_filter) {
308 av_log(avctx, AV_LOG_ERROR, "Could not find %s device.\n",
312 *pfilter = device_filter;
319 * Cycle through available formats using the specified pin,
320 * try to set parameters specified through AVOptions and if successful
321 * return 1 in *pformat_set.
322 * If pformat_set is NULL, list all pin capabilities.
325 dshow_cycle_formats(AVFormatContext *avctx, enum dshowDeviceType devtype,
326 IPin *pin, int *pformat_set)
328 struct dshow_ctx *ctx = avctx->priv_data;
329 IAMStreamConfig *config = NULL;
330 AM_MEDIA_TYPE *type = NULL;
335 if (IPin_QueryInterface(pin, &IID_IAMStreamConfig, (void **) &config) != S_OK)
337 if (IAMStreamConfig_GetNumberOfCapabilities(config, &n, &size) != S_OK)
340 caps = av_malloc(size);
344 for (i = 0; i < n && !format_set; i++) {
345 IAMStreamConfig_GetStreamCaps(config, i, &type, (void *) caps);
348 ff_print_AM_MEDIA_TYPE(type);
351 if (devtype == VideoDevice) {
352 VIDEO_STREAM_CONFIG_CAPS *vcaps = caps;
353 BITMAPINFOHEADER *bih;
356 ff_print_VIDEO_STREAM_CONFIG_CAPS(vcaps);
358 if (IsEqualGUID(&type->formattype, &FORMAT_VideoInfo)) {
359 VIDEOINFOHEADER *v = (void *) type->pbFormat;
360 fr = &v->AvgTimePerFrame;
362 } else if (IsEqualGUID(&type->formattype, &FORMAT_VideoInfo2)) {
363 VIDEOINFOHEADER2 *v = (void *) type->pbFormat;
364 fr = &v->AvgTimePerFrame;
370 av_log(avctx, AV_LOG_INFO, " min s=%ldx%ld fps=%g max s=%ldx%ld fps=%g\n",
371 vcaps->MinOutputSize.cx, vcaps->MinOutputSize.cy,
372 1e7 / vcaps->MinFrameInterval,
373 vcaps->MaxOutputSize.cx, vcaps->MaxOutputSize.cy,
374 1e7 / vcaps->MaxFrameInterval);
377 if (ctx->framerate) {
378 int64_t framerate = ((int64_t) ctx->requested_framerate.den*10000000)
379 / ctx->requested_framerate.num;
380 if (framerate > vcaps->MaxFrameInterval ||
381 framerate < vcaps->MinFrameInterval)
385 if (ctx->video_size) {
386 if (ctx->requested_width > vcaps->MaxOutputSize.cx ||
387 ctx->requested_width < vcaps->MinOutputSize.cx ||
388 ctx->requested_height > vcaps->MaxOutputSize.cy ||
389 ctx->requested_height < vcaps->MinOutputSize.cy)
391 bih->biWidth = ctx->requested_width;
392 bih->biHeight = ctx->requested_height;
395 AUDIO_STREAM_CONFIG_CAPS *acaps = caps;
398 ff_print_AUDIO_STREAM_CONFIG_CAPS(acaps);
400 if (IsEqualGUID(&type->formattype, &FORMAT_WaveFormatEx)) {
401 fx = (void *) type->pbFormat;
406 av_log(avctx, AV_LOG_INFO, " min ch=%lu bits=%lu rate=%6lu max ch=%lu bits=%lu rate=%6lu\n",
407 acaps->MinimumChannels, acaps->MinimumBitsPerSample, acaps->MinimumSampleFrequency,
408 acaps->MaximumChannels, acaps->MaximumBitsPerSample, acaps->MaximumSampleFrequency);
411 if (ctx->sample_rate) {
412 if (ctx->sample_rate > acaps->MaximumSampleFrequency ||
413 ctx->sample_rate < acaps->MinimumSampleFrequency)
415 fx->nSamplesPerSec = ctx->sample_rate;
417 if (ctx->sample_size) {
418 if (ctx->sample_size > acaps->MaximumBitsPerSample ||
419 ctx->sample_size < acaps->MinimumBitsPerSample)
421 fx->wBitsPerSample = ctx->sample_size;
424 if (ctx->channels > acaps->MaximumChannels ||
425 ctx->channels < acaps->MinimumChannels)
427 fx->nChannels = ctx->channels;
430 if (IAMStreamConfig_SetFormat(config, type) != S_OK)
435 CoTaskMemFree(type->pbFormat);
439 IAMStreamConfig_Release(config);
443 *pformat_set = format_set;
447 * Cycle through available pins using the device_filter device, of type
448 * devtype, retrieve the first output pin and return the pointer to the
449 * object found in *ppin.
450 * If ppin is NULL, cycle through all pins listing audio/video capabilities.
453 dshow_cycle_pins(AVFormatContext *avctx, enum dshowDeviceType devtype,
454 IBaseFilter *device_filter, IPin **ppin)
456 struct dshow_ctx *ctx = avctx->priv_data;
458 IPin *device_pin = NULL;
462 const GUID *mediatype[2] = { &MEDIATYPE_Video, &MEDIATYPE_Audio };
463 const char *devtypename = (devtype == VideoDevice) ? "video" : "audio";
465 int set_format = (devtype == VideoDevice && (ctx->video_size || ctx->framerate))
466 || (devtype == AudioDevice && (ctx->channels || ctx->sample_rate));
469 r = IBaseFilter_EnumPins(device_filter, &pins);
471 av_log(avctx, AV_LOG_ERROR, "Could not enumerate pins.\n");
476 av_log(avctx, AV_LOG_INFO, "DirectShow %s device options\n",
479 while (!device_pin && IEnumPins_Next(pins, 1, &pin, NULL) == S_OK) {
480 IKsPropertySet *p = NULL;
481 IEnumMediaTypes *types = NULL;
487 IPin_QueryPinInfo(pin, &info);
488 IBaseFilter_Release(info.pFilter);
490 if (info.dir != PINDIR_OUTPUT)
492 if (IPin_QueryInterface(pin, &IID_IKsPropertySet, (void **) &p) != S_OK)
494 if (IKsPropertySet_Get(p, &ROPSETID_Pin, AMPROPERTY_PIN_CATEGORY,
495 NULL, 0, &category, sizeof(GUID), &r2) != S_OK)
497 if (!IsEqualGUID(&category, &PIN_CATEGORY_CAPTURE))
501 char *buf = dup_wchar_to_utf8(info.achName);
502 av_log(avctx, AV_LOG_INFO, " Pin \"%s\"\n", buf);
504 dshow_cycle_formats(avctx, devtype, pin, NULL);
508 dshow_cycle_formats(avctx, devtype, pin, &format_set);
514 if (IPin_EnumMediaTypes(pin, &types) != S_OK)
517 IEnumMediaTypes_Reset(types);
518 while (!device_pin && IEnumMediaTypes_Next(types, 1, &type, NULL) == S_OK) {
519 if (IsEqualGUID(&type->majortype, mediatype[devtype])) {
528 IEnumMediaTypes_Release(types);
530 IKsPropertySet_Release(p);
531 if (device_pin != pin)
535 IEnumPins_Release(pins);
538 if (set_format && !format_set) {
539 av_log(avctx, AV_LOG_ERROR, "Could not set %s options\n", devtypename);
543 av_log(avctx, AV_LOG_ERROR,
544 "Could not find output pin from %s capture device.\n", devtypename);
554 * List options for device with type devtype.
556 * @param devenum device enumerator used for accessing the device
559 dshow_list_device_options(AVFormatContext *avctx, ICreateDevEnum *devenum,
560 enum dshowDeviceType devtype)
562 IBaseFilter *device_filter = NULL;
565 if ((r = dshow_cycle_devices(avctx, devenum, devtype, &device_filter)) < 0)
567 if ((r = dshow_cycle_pins(avctx, devtype, device_filter, NULL)) < 0)
574 dshow_open_device(AVFormatContext *avctx, ICreateDevEnum *devenum,
575 enum dshowDeviceType devtype)
577 struct dshow_ctx *ctx = avctx->priv_data;
578 IBaseFilter *device_filter = NULL;
579 IGraphBuilder *graph = ctx->graph;
580 IPin *device_pin = NULL;
581 libAVPin *capture_pin = NULL;
582 libAVFilter *capture_filter = NULL;
583 int ret = AVERROR(EIO);
586 const wchar_t *filter_name[2] = { L"Audio capture filter", L"Video capture filter" };
588 if ((r = dshow_cycle_devices(avctx, devenum, devtype, &device_filter)) < 0) {
593 ctx->device_filter [devtype] = device_filter;
595 r = IGraphBuilder_AddFilter(graph, device_filter, NULL);
597 av_log(avctx, AV_LOG_ERROR, "Could not add device filter to graph.\n");
601 if ((r = dshow_cycle_pins(avctx, devtype, device_filter, &device_pin)) < 0) {
605 ctx->device_pin[devtype] = device_pin;
607 capture_filter = libAVFilter_Create(avctx, callback, devtype);
608 if (!capture_filter) {
609 av_log(avctx, AV_LOG_ERROR, "Could not create grabber filter.\n");
612 ctx->capture_filter[devtype] = capture_filter;
614 r = IGraphBuilder_AddFilter(graph, (IBaseFilter *) capture_filter,
615 filter_name[devtype]);
617 av_log(avctx, AV_LOG_ERROR, "Could not add capture filter to graph\n");
621 libAVPin_AddRef(capture_filter->pin);
622 capture_pin = capture_filter->pin;
623 ctx->capture_pin[devtype] = capture_pin;
625 r = IGraphBuilder_ConnectDirect(graph, device_pin, (IPin *) capture_pin, NULL);
627 av_log(avctx, AV_LOG_ERROR, "Could not connect pins\n");
637 static enum CodecID waveform_codec_id(enum AVSampleFormat sample_fmt)
639 switch (sample_fmt) {
640 case AV_SAMPLE_FMT_U8: return CODEC_ID_PCM_U8;
641 case AV_SAMPLE_FMT_S16: return CODEC_ID_PCM_S16LE;
642 case AV_SAMPLE_FMT_S32: return CODEC_ID_PCM_S32LE;
643 default: return CODEC_ID_NONE; /* Should never happen. */
647 static enum SampleFormat sample_fmt_bits_per_sample(int bits)
650 case 8: return AV_SAMPLE_FMT_U8;
651 case 16: return AV_SAMPLE_FMT_S16;
652 case 32: return AV_SAMPLE_FMT_S32;
653 default: return AV_SAMPLE_FMT_NONE; /* Should never happen. */
658 dshow_add_device(AVFormatContext *avctx, AVFormatParameters *ap,
659 enum dshowDeviceType devtype)
661 struct dshow_ctx *ctx = avctx->priv_data;
663 AVCodecContext *codec;
665 int ret = AVERROR(EIO);
667 st = avformat_new_stream(avctx, NULL);
669 ret = AVERROR(ENOMEM);
674 ctx->capture_filter[devtype]->stream_index = st->index;
676 libAVPin_ConnectionMediaType(ctx->capture_pin[devtype], &type);
679 if (devtype == VideoDevice) {
680 BITMAPINFOHEADER *bih = NULL;
682 if (IsEqualGUID(&type.formattype, &FORMAT_VideoInfo)) {
683 VIDEOINFOHEADER *v = (void *) type.pbFormat;
685 } else if (IsEqualGUID(&type.formattype, &FORMAT_VideoInfo2)) {
686 VIDEOINFOHEADER2 *v = (void *) type.pbFormat;
690 av_log(avctx, AV_LOG_ERROR, "Could not get media type.\n");
694 codec->time_base = ap->time_base;
695 codec->codec_type = AVMEDIA_TYPE_VIDEO;
696 codec->width = bih->biWidth;
697 codec->height = bih->biHeight;
698 codec->pix_fmt = dshow_pixfmt(bih->biCompression, bih->biBitCount);
699 if (codec->pix_fmt == PIX_FMT_NONE) {
700 codec->codec_id = dshow_codecid(bih->biCompression);
701 if (codec->codec_id == CODEC_ID_NONE) {
702 av_log(avctx, AV_LOG_ERROR, "Unknown compression type. "
703 "Please report verbose (-v 9) debug information.\n");
704 dshow_read_close(avctx);
705 return AVERROR_PATCHWELCOME;
707 codec->bits_per_coded_sample = bih->biBitCount;
709 codec->codec_id = CODEC_ID_RAWVIDEO;
710 if (bih->biCompression == BI_RGB) {
711 codec->bits_per_coded_sample = bih->biBitCount;
712 codec->extradata = av_malloc(9 + FF_INPUT_BUFFER_PADDING_SIZE);
713 if (codec->extradata) {
714 codec->extradata_size = 9;
715 memcpy(codec->extradata, "BottomUp", 9);
720 WAVEFORMATEX *fx = NULL;
722 if (IsEqualGUID(&type.formattype, &FORMAT_WaveFormatEx)) {
723 fx = (void *) type.pbFormat;
726 av_log(avctx, AV_LOG_ERROR, "Could not get media type.\n");
730 codec->codec_type = AVMEDIA_TYPE_AUDIO;
731 codec->sample_fmt = sample_fmt_bits_per_sample(fx->wBitsPerSample);
732 codec->codec_id = waveform_codec_id(codec->sample_fmt);
733 codec->sample_rate = fx->nSamplesPerSec;
734 codec->channels = fx->nChannels;
737 av_set_pts_info(st, 64, 1, 10000000);
745 static int parse_device_name(AVFormatContext *avctx)
747 struct dshow_ctx *ctx = avctx->priv_data;
748 char **device_name = ctx->device_name;
749 char *name = av_strdup(avctx->filename);
754 while ((type = strtok(tmp, "="))) {
755 char *token = strtok(NULL, ":");
758 if (!strcmp(type, "video")) {
759 device_name[0] = token;
760 } else if (!strcmp(type, "audio")) {
761 device_name[1] = token;
763 device_name[0] = NULL;
764 device_name[1] = NULL;
769 if (!device_name[0] && !device_name[1]) {
773 device_name[0] = av_strdup(device_name[0]);
775 device_name[1] = av_strdup(device_name[1]);
782 static int dshow_read_header(AVFormatContext *avctx, AVFormatParameters *ap)
784 struct dshow_ctx *ctx = avctx->priv_data;
785 IGraphBuilder *graph = NULL;
786 ICreateDevEnum *devenum = NULL;
787 IMediaControl *control = NULL;
788 int ret = AVERROR(EIO);
791 if (!ctx->list_devices && !parse_device_name(avctx)) {
792 av_log(avctx, AV_LOG_ERROR, "Malformed dshow input string.\n");
796 if (ctx->video_size) {
797 r = av_parse_video_size(&ctx->requested_width, &ctx->requested_height, ctx->video_size);
799 av_log(avctx, AV_LOG_ERROR, "Could not parse video size '%s'.\n", ctx->video_size);
803 if (ctx->framerate) {
804 r = av_parse_video_rate(&ctx->requested_framerate, ctx->framerate);
806 av_log(avctx, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", ctx->framerate);
813 r = CoCreateInstance(&CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER,
814 &IID_IGraphBuilder, (void **) &graph);
816 av_log(avctx, AV_LOG_ERROR, "Could not create capture graph.\n");
821 r = CoCreateInstance(&CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER,
822 &IID_ICreateDevEnum, (void **) &devenum);
824 av_log(avctx, AV_LOG_ERROR, "Could not enumerate system devices.\n");
828 if (ctx->list_devices) {
829 av_log(avctx, AV_LOG_INFO, "DirectShow video devices\n");
830 dshow_cycle_devices(avctx, devenum, VideoDevice, NULL);
831 av_log(avctx, AV_LOG_INFO, "DirectShow audio devices\n");
832 dshow_cycle_devices(avctx, devenum, AudioDevice, NULL);
836 if (ctx->list_options) {
837 if (ctx->device_name[VideoDevice])
838 dshow_list_device_options(avctx, devenum, VideoDevice);
839 if (ctx->device_name[AudioDevice])
840 dshow_list_device_options(avctx, devenum, AudioDevice);
845 if (ctx->device_name[VideoDevice]) {
846 ret = dshow_open_device(avctx, devenum, VideoDevice);
849 ret = dshow_add_device(avctx, ap, VideoDevice);
853 if (ctx->device_name[AudioDevice]) {
854 ret = dshow_open_device(avctx, devenum, AudioDevice);
857 ret = dshow_add_device(avctx, ap, AudioDevice);
862 ctx->mutex = CreateMutex(NULL, 0, NULL);
864 av_log(avctx, AV_LOG_ERROR, "Could not create Mutex\n");
867 ctx->event = CreateEvent(NULL, 1, 0, NULL);
869 av_log(avctx, AV_LOG_ERROR, "Could not create Event\n");
873 r = IGraphBuilder_QueryInterface(graph, &IID_IMediaControl, (void **) &control);
875 av_log(avctx, AV_LOG_ERROR, "Could not get media control.\n");
878 ctx->control = control;
880 r = IMediaControl_Run(control);
883 r = IMediaControl_GetState(control, 0, &pfs);
886 av_log(avctx, AV_LOG_ERROR, "Could not run filter\n");
895 dshow_read_close(avctx);
898 ICreateDevEnum_Release(devenum);
903 static int dshow_read_packet(AVFormatContext *s, AVPacket *pkt)
905 struct dshow_ctx *ctx = s->priv_data;
906 AVPacketList *pktl = NULL;
909 WaitForSingleObject(ctx->mutex, INFINITE);
912 *pkt = ctx->pktl->pkt;
913 ctx->pktl = ctx->pktl->next;
916 ResetEvent(ctx->event);
917 ReleaseMutex(ctx->mutex);
919 if (s->flags & AVFMT_FLAG_NONBLOCK) {
920 return AVERROR(EAGAIN);
922 WaitForSingleObject(ctx->event, INFINITE);
927 ctx->curbufsize -= pkt->size;
932 #define OFFSET(x) offsetof(struct dshow_ctx, x)
933 #define DEC AV_OPT_FLAG_DECODING_PARAM
934 static const AVOption options[] = {
935 { "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 },
936 { "framerate", "set video frame rate", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
937 { "sample_rate", "set audio sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, DEC },
938 { "sample_size", "set audio sample size", OFFSET(sample_size), AV_OPT_TYPE_INT, {.dbl = 0}, 0, 16, DEC },
939 { "channels", "set number of audio channels, such as 1 or 2", OFFSET(channels), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, DEC },
940 { "list_devices", "list available devices", OFFSET(list_devices), AV_OPT_TYPE_INT, {.dbl=0}, 0, 1, DEC, "list_devices" },
941 { "true", "", 0, AV_OPT_TYPE_CONST, {.dbl=1}, 0, 0, DEC, "list_devices" },
942 { "false", "", 0, AV_OPT_TYPE_CONST, {.dbl=0}, 0, 0, DEC, "list_devices" },
943 { "list_options", "list available options for specified device", OFFSET(list_options), AV_OPT_TYPE_INT, {.dbl=0}, 0, 1, DEC, "list_options" },
944 { "true", "", 0, AV_OPT_TYPE_CONST, {.dbl=1}, 0, 0, DEC, "list_options" },
945 { "false", "", 0, AV_OPT_TYPE_CONST, {.dbl=0}, 0, 0, DEC, "list_options" },
946 { "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 },
947 { "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 },
951 static const AVClass dshow_class = {
952 .class_name = "DirectShow indev",
953 .item_name = av_default_item_name,
955 .version = LIBAVUTIL_VERSION_INT,
958 AVInputFormat ff_dshow_demuxer = {
960 NULL_IF_CONFIG_SMALL("DirectShow capture"),
961 sizeof(struct dshow_ctx),
966 .flags = AVFMT_NOFILE,
967 .priv_class = &dshow_class,