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"
24 #include "libavformat/internal.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;
77 switch(biBitCount) { /* 1-8 are untested */
79 return PIX_FMT_MONOWHITE;
85 return PIX_FMT_RGB555;
95 static enum CodecID dshow_codecid(DWORD biCompression)
97 switch(biCompression) {
98 case MKTAG('d', 'v', 's', 'd'):
99 return CODEC_ID_DVVIDEO;
100 case MKTAG('M', 'J', 'P', 'G'):
101 case MKTAG('m', 'j', 'p', 'g'):
102 return CODEC_ID_MJPEG;
104 return CODEC_ID_NONE;
108 dshow_read_close(AVFormatContext *s)
110 struct dshow_ctx *ctx = s->priv_data;
114 IMediaControl_Stop(ctx->control);
115 IMediaControl_Release(ctx->control);
121 r = IGraphBuilder_EnumFilters(ctx->graph, &fenum);
124 IEnumFilters_Reset(fenum);
125 while (IEnumFilters_Next(fenum, 1, &f, NULL) == S_OK) {
126 if (IGraphBuilder_RemoveFilter(ctx->graph, f) == S_OK)
127 IEnumFilters_Reset(fenum); /* When a filter is removed,
128 * the list must be reset. */
129 IBaseFilter_Release(f);
131 IEnumFilters_Release(fenum);
133 IGraphBuilder_Release(ctx->graph);
136 if (ctx->capture_pin[VideoDevice])
137 libAVPin_Release(ctx->capture_pin[VideoDevice]);
138 if (ctx->capture_pin[AudioDevice])
139 libAVPin_Release(ctx->capture_pin[AudioDevice]);
140 if (ctx->capture_filter[VideoDevice])
141 libAVFilter_Release(ctx->capture_filter[VideoDevice]);
142 if (ctx->capture_filter[AudioDevice])
143 libAVFilter_Release(ctx->capture_filter[AudioDevice]);
145 if (ctx->device_pin[VideoDevice])
146 IPin_Release(ctx->device_pin[VideoDevice]);
147 if (ctx->device_pin[AudioDevice])
148 IPin_Release(ctx->device_pin[AudioDevice]);
149 if (ctx->device_filter[VideoDevice])
150 IBaseFilter_Release(ctx->device_filter[VideoDevice]);
151 if (ctx->device_filter[AudioDevice])
152 IBaseFilter_Release(ctx->device_filter[AudioDevice]);
154 if (ctx->device_name[0])
155 av_free(ctx->device_name[0]);
156 if (ctx->device_name[1])
157 av_free(ctx->device_name[1]);
160 CloseHandle(ctx->mutex);
162 CloseHandle(ctx->event);
166 AVPacketList *next = pktl->next;
167 av_destruct_packet(&pktl->pkt);
175 static char *dup_wchar_to_utf8(wchar_t *w)
178 int l = WideCharToMultiByte(CP_UTF8, 0, w, -1, 0, 0, 0, 0);
181 WideCharToMultiByte(CP_UTF8, 0, w, -1, s, l, 0, 0);
185 static int shall_we_drop(AVFormatContext *s)
187 struct dshow_ctx *ctx = s->priv_data;
188 const uint8_t dropscore[] = {62, 75, 87, 100};
189 const int ndropscores = FF_ARRAY_ELEMS(dropscore);
190 unsigned int buffer_fullness = (ctx->curbufsize*100)/s->max_picture_buffer;
192 if(dropscore[++ctx->video_frame_num%ndropscores] <= buffer_fullness) {
193 av_log(s, AV_LOG_ERROR,
194 "real-time buffer %d%% full! frame dropped!\n", buffer_fullness);
202 callback(void *priv_data, int index, uint8_t *buf, int buf_size, int64_t time)
204 AVFormatContext *s = priv_data;
205 struct dshow_ctx *ctx = s->priv_data;
206 AVPacketList **ppktl, *pktl_next;
208 // dump_videohdr(s, vdhdr);
213 WaitForSingleObject(ctx->mutex, INFINITE);
215 pktl_next = av_mallocz(sizeof(AVPacketList));
219 if(av_new_packet(&pktl_next->pkt, buf_size) < 0) {
224 pktl_next->pkt.stream_index = index;
225 pktl_next->pkt.pts = time;
226 memcpy(pktl_next->pkt.data, buf, buf_size);
228 for(ppktl = &ctx->pktl ; *ppktl ; ppktl = &(*ppktl)->next);
231 ctx->curbufsize += buf_size;
233 SetEvent(ctx->event);
234 ReleaseMutex(ctx->mutex);
238 ReleaseMutex(ctx->mutex);
243 * Cycle through available devices using the device enumerator devenum,
244 * retrieve the device with type specified by devtype and return the
245 * pointer to the object found in *pfilter.
246 * If pfilter is NULL, list all device names.
249 dshow_cycle_devices(AVFormatContext *avctx, ICreateDevEnum *devenum,
250 enum dshowDeviceType devtype, IBaseFilter **pfilter)
252 struct dshow_ctx *ctx = avctx->priv_data;
253 IBaseFilter *device_filter = NULL;
254 IEnumMoniker *classenum = NULL;
256 const char *device_name = ctx->device_name[devtype];
257 int skip = (devtype == VideoDevice) ? ctx->video_device_number
258 : ctx->audio_device_number;
261 const GUID *device_guid[2] = { &CLSID_VideoInputDeviceCategory,
262 &CLSID_AudioInputDeviceCategory };
263 const char *devtypename = (devtype == VideoDevice) ? "video" : "audio";
265 r = ICreateDevEnum_CreateClassEnumerator(devenum, device_guid[devtype],
266 (IEnumMoniker **) &classenum, 0);
268 av_log(avctx, AV_LOG_ERROR, "Could not enumerate %s devices.\n",
273 while (!device_filter && IEnumMoniker_Next(classenum, 1, &m, NULL) == S_OK) {
274 IPropertyBag *bag = NULL;
278 r = IMoniker_BindToStorage(m, 0, 0, &IID_IPropertyBag, (void *) &bag);
283 r = IPropertyBag_Read(bag, L"FriendlyName", &var, NULL);
287 buf = dup_wchar_to_utf8(var.bstrVal);
290 if (strcmp(device_name, buf))
294 IMoniker_BindToObject(m, 0, 0, &IID_IBaseFilter, (void *) &device_filter);
296 av_log(avctx, AV_LOG_INFO, " \"%s\"\n", buf);
303 IPropertyBag_Release(bag);
307 IEnumMoniker_Release(classenum);
310 if (!device_filter) {
311 av_log(avctx, AV_LOG_ERROR, "Could not find %s device.\n",
315 *pfilter = device_filter;
322 * Cycle through available formats using the specified pin,
323 * try to set parameters specified through AVOptions and if successful
324 * return 1 in *pformat_set.
325 * If pformat_set is NULL, list all pin capabilities.
328 dshow_cycle_formats(AVFormatContext *avctx, enum dshowDeviceType devtype,
329 IPin *pin, int *pformat_set)
331 struct dshow_ctx *ctx = avctx->priv_data;
332 IAMStreamConfig *config = NULL;
333 AM_MEDIA_TYPE *type = NULL;
338 if (IPin_QueryInterface(pin, &IID_IAMStreamConfig, (void **) &config) != S_OK)
340 if (IAMStreamConfig_GetNumberOfCapabilities(config, &n, &size) != S_OK)
343 caps = av_malloc(size);
347 for (i = 0; i < n && !format_set; i++) {
348 IAMStreamConfig_GetStreamCaps(config, i, &type, (void *) caps);
351 ff_print_AM_MEDIA_TYPE(type);
354 if (devtype == VideoDevice) {
355 VIDEO_STREAM_CONFIG_CAPS *vcaps = caps;
356 BITMAPINFOHEADER *bih;
359 ff_print_VIDEO_STREAM_CONFIG_CAPS(vcaps);
361 if (IsEqualGUID(&type->formattype, &FORMAT_VideoInfo)) {
362 VIDEOINFOHEADER *v = (void *) type->pbFormat;
363 fr = &v->AvgTimePerFrame;
365 } else if (IsEqualGUID(&type->formattype, &FORMAT_VideoInfo2)) {
366 VIDEOINFOHEADER2 *v = (void *) type->pbFormat;
367 fr = &v->AvgTimePerFrame;
373 av_log(avctx, AV_LOG_INFO, " min s=%ldx%ld fps=%g max s=%ldx%ld fps=%g\n",
374 vcaps->MinOutputSize.cx, vcaps->MinOutputSize.cy,
375 1e7 / vcaps->MaxFrameInterval,
376 vcaps->MaxOutputSize.cx, vcaps->MaxOutputSize.cy,
377 1e7 / vcaps->MinFrameInterval);
380 if (ctx->framerate) {
381 int64_t framerate = ((int64_t) ctx->requested_framerate.den*10000000)
382 / ctx->requested_framerate.num;
383 if (framerate > vcaps->MaxFrameInterval ||
384 framerate < vcaps->MinFrameInterval)
388 if (ctx->video_size) {
389 if (ctx->requested_width > vcaps->MaxOutputSize.cx ||
390 ctx->requested_width < vcaps->MinOutputSize.cx ||
391 ctx->requested_height > vcaps->MaxOutputSize.cy ||
392 ctx->requested_height < vcaps->MinOutputSize.cy)
394 bih->biWidth = ctx->requested_width;
395 bih->biHeight = ctx->requested_height;
398 AUDIO_STREAM_CONFIG_CAPS *acaps = caps;
401 ff_print_AUDIO_STREAM_CONFIG_CAPS(acaps);
403 if (IsEqualGUID(&type->formattype, &FORMAT_WaveFormatEx)) {
404 fx = (void *) type->pbFormat;
409 av_log(avctx, AV_LOG_INFO, " min ch=%lu bits=%lu rate=%6lu max ch=%lu bits=%lu rate=%6lu\n",
410 acaps->MinimumChannels, acaps->MinimumBitsPerSample, acaps->MinimumSampleFrequency,
411 acaps->MaximumChannels, acaps->MaximumBitsPerSample, acaps->MaximumSampleFrequency);
414 if (ctx->sample_rate) {
415 if (ctx->sample_rate > acaps->MaximumSampleFrequency ||
416 ctx->sample_rate < acaps->MinimumSampleFrequency)
418 fx->nSamplesPerSec = ctx->sample_rate;
420 if (ctx->sample_size) {
421 if (ctx->sample_size > acaps->MaximumBitsPerSample ||
422 ctx->sample_size < acaps->MinimumBitsPerSample)
424 fx->wBitsPerSample = ctx->sample_size;
427 if (ctx->channels > acaps->MaximumChannels ||
428 ctx->channels < acaps->MinimumChannels)
430 fx->nChannels = ctx->channels;
433 if (IAMStreamConfig_SetFormat(config, type) != S_OK)
438 CoTaskMemFree(type->pbFormat);
442 IAMStreamConfig_Release(config);
446 *pformat_set = format_set;
450 * Cycle through available pins using the device_filter device, of type
451 * devtype, retrieve the first output pin and return the pointer to the
452 * object found in *ppin.
453 * If ppin is NULL, cycle through all pins listing audio/video capabilities.
456 dshow_cycle_pins(AVFormatContext *avctx, enum dshowDeviceType devtype,
457 IBaseFilter *device_filter, IPin **ppin)
459 struct dshow_ctx *ctx = avctx->priv_data;
461 IPin *device_pin = NULL;
465 const GUID *mediatype[2] = { &MEDIATYPE_Video, &MEDIATYPE_Audio };
466 const char *devtypename = (devtype == VideoDevice) ? "video" : "audio";
468 int set_format = (devtype == VideoDevice && (ctx->video_size || ctx->framerate))
469 || (devtype == AudioDevice && (ctx->channels || ctx->sample_rate));
472 r = IBaseFilter_EnumPins(device_filter, &pins);
474 av_log(avctx, AV_LOG_ERROR, "Could not enumerate pins.\n");
479 av_log(avctx, AV_LOG_INFO, "DirectShow %s device options\n",
482 while (!device_pin && IEnumPins_Next(pins, 1, &pin, NULL) == S_OK) {
483 IKsPropertySet *p = NULL;
484 IEnumMediaTypes *types = NULL;
490 IPin_QueryPinInfo(pin, &info);
491 IBaseFilter_Release(info.pFilter);
493 if (info.dir != PINDIR_OUTPUT)
495 if (IPin_QueryInterface(pin, &IID_IKsPropertySet, (void **) &p) != S_OK)
497 if (IKsPropertySet_Get(p, &ROPSETID_Pin, AMPROPERTY_PIN_CATEGORY,
498 NULL, 0, &category, sizeof(GUID), &r2) != S_OK)
500 if (!IsEqualGUID(&category, &PIN_CATEGORY_CAPTURE))
504 char *buf = dup_wchar_to_utf8(info.achName);
505 av_log(avctx, AV_LOG_INFO, " Pin \"%s\"\n", buf);
507 dshow_cycle_formats(avctx, devtype, pin, NULL);
511 dshow_cycle_formats(avctx, devtype, pin, &format_set);
517 if (IPin_EnumMediaTypes(pin, &types) != S_OK)
520 IEnumMediaTypes_Reset(types);
521 while (!device_pin && IEnumMediaTypes_Next(types, 1, &type, NULL) == S_OK) {
522 if (IsEqualGUID(&type->majortype, mediatype[devtype])) {
531 IEnumMediaTypes_Release(types);
533 IKsPropertySet_Release(p);
534 if (device_pin != pin)
538 IEnumPins_Release(pins);
541 if (set_format && !format_set) {
542 av_log(avctx, AV_LOG_ERROR, "Could not set %s options\n", devtypename);
546 av_log(avctx, AV_LOG_ERROR,
547 "Could not find output pin from %s capture device.\n", devtypename);
557 * List options for device with type devtype.
559 * @param devenum device enumerator used for accessing the device
562 dshow_list_device_options(AVFormatContext *avctx, ICreateDevEnum *devenum,
563 enum dshowDeviceType devtype)
565 struct dshow_ctx *ctx = avctx->priv_data;
566 IBaseFilter *device_filter = NULL;
569 if ((r = dshow_cycle_devices(avctx, devenum, devtype, &device_filter)) < 0)
571 ctx->device_filter[devtype] = device_filter;
572 if ((r = dshow_cycle_pins(avctx, devtype, device_filter, NULL)) < 0)
579 dshow_open_device(AVFormatContext *avctx, ICreateDevEnum *devenum,
580 enum dshowDeviceType devtype)
582 struct dshow_ctx *ctx = avctx->priv_data;
583 IBaseFilter *device_filter = NULL;
584 IGraphBuilder *graph = ctx->graph;
585 IPin *device_pin = NULL;
586 libAVPin *capture_pin = NULL;
587 libAVFilter *capture_filter = NULL;
588 int ret = AVERROR(EIO);
591 const wchar_t *filter_name[2] = { L"Audio capture filter", L"Video capture filter" };
593 if ((r = dshow_cycle_devices(avctx, devenum, devtype, &device_filter)) < 0) {
598 ctx->device_filter [devtype] = device_filter;
600 r = IGraphBuilder_AddFilter(graph, device_filter, NULL);
602 av_log(avctx, AV_LOG_ERROR, "Could not add device filter to graph.\n");
606 if ((r = dshow_cycle_pins(avctx, devtype, device_filter, &device_pin)) < 0) {
610 ctx->device_pin[devtype] = device_pin;
612 capture_filter = libAVFilter_Create(avctx, callback, devtype);
613 if (!capture_filter) {
614 av_log(avctx, AV_LOG_ERROR, "Could not create grabber filter.\n");
617 ctx->capture_filter[devtype] = capture_filter;
619 r = IGraphBuilder_AddFilter(graph, (IBaseFilter *) capture_filter,
620 filter_name[devtype]);
622 av_log(avctx, AV_LOG_ERROR, "Could not add capture filter to graph\n");
626 libAVPin_AddRef(capture_filter->pin);
627 capture_pin = capture_filter->pin;
628 ctx->capture_pin[devtype] = capture_pin;
630 r = IGraphBuilder_ConnectDirect(graph, device_pin, (IPin *) capture_pin, NULL);
632 av_log(avctx, AV_LOG_ERROR, "Could not connect pins\n");
642 static enum CodecID waveform_codec_id(enum AVSampleFormat sample_fmt)
644 switch (sample_fmt) {
645 case AV_SAMPLE_FMT_U8: return CODEC_ID_PCM_U8;
646 case AV_SAMPLE_FMT_S16: return CODEC_ID_PCM_S16LE;
647 case AV_SAMPLE_FMT_S32: return CODEC_ID_PCM_S32LE;
648 default: return CODEC_ID_NONE; /* Should never happen. */
652 static enum SampleFormat sample_fmt_bits_per_sample(int bits)
655 case 8: return AV_SAMPLE_FMT_U8;
656 case 16: return AV_SAMPLE_FMT_S16;
657 case 32: return AV_SAMPLE_FMT_S32;
658 default: return AV_SAMPLE_FMT_NONE; /* Should never happen. */
663 dshow_add_device(AVFormatContext *avctx, AVFormatParameters *ap,
664 enum dshowDeviceType devtype)
666 struct dshow_ctx *ctx = avctx->priv_data;
668 AVCodecContext *codec;
670 int ret = AVERROR(EIO);
672 st = avformat_new_stream(avctx, NULL);
674 ret = AVERROR(ENOMEM);
679 ctx->capture_filter[devtype]->stream_index = st->index;
681 libAVPin_ConnectionMediaType(ctx->capture_pin[devtype], &type);
684 if (devtype == VideoDevice) {
685 BITMAPINFOHEADER *bih = NULL;
687 if (IsEqualGUID(&type.formattype, &FORMAT_VideoInfo)) {
688 VIDEOINFOHEADER *v = (void *) type.pbFormat;
690 } else if (IsEqualGUID(&type.formattype, &FORMAT_VideoInfo2)) {
691 VIDEOINFOHEADER2 *v = (void *) type.pbFormat;
695 av_log(avctx, AV_LOG_ERROR, "Could not get media type.\n");
699 codec->time_base = ap->time_base;
700 codec->codec_type = AVMEDIA_TYPE_VIDEO;
701 codec->width = bih->biWidth;
702 codec->height = bih->biHeight;
703 codec->pix_fmt = dshow_pixfmt(bih->biCompression, bih->biBitCount);
704 if (codec->pix_fmt == PIX_FMT_NONE) {
705 codec->codec_id = dshow_codecid(bih->biCompression);
706 if (codec->codec_id == CODEC_ID_NONE) {
707 av_log(avctx, AV_LOG_ERROR, "Unknown compression type. "
708 "Please report verbose (-v 9) debug information.\n");
709 dshow_read_close(avctx);
710 return AVERROR_PATCHWELCOME;
712 codec->bits_per_coded_sample = bih->biBitCount;
714 codec->codec_id = CODEC_ID_RAWVIDEO;
715 if (bih->biCompression == BI_RGB || bih->biCompression == BI_BITFIELDS) {
716 codec->bits_per_coded_sample = bih->biBitCount;
717 codec->extradata = av_malloc(9 + FF_INPUT_BUFFER_PADDING_SIZE);
718 if (codec->extradata) {
719 codec->extradata_size = 9;
720 memcpy(codec->extradata, "BottomUp", 9);
725 WAVEFORMATEX *fx = NULL;
727 if (IsEqualGUID(&type.formattype, &FORMAT_WaveFormatEx)) {
728 fx = (void *) type.pbFormat;
731 av_log(avctx, AV_LOG_ERROR, "Could not get media type.\n");
735 codec->codec_type = AVMEDIA_TYPE_AUDIO;
736 codec->sample_fmt = sample_fmt_bits_per_sample(fx->wBitsPerSample);
737 codec->codec_id = waveform_codec_id(codec->sample_fmt);
738 codec->sample_rate = fx->nSamplesPerSec;
739 codec->channels = fx->nChannels;
742 avpriv_set_pts_info(st, 64, 1, 10000000);
750 static int parse_device_name(AVFormatContext *avctx)
752 struct dshow_ctx *ctx = avctx->priv_data;
753 char **device_name = ctx->device_name;
754 char *name = av_strdup(avctx->filename);
759 while ((type = strtok(tmp, "="))) {
760 char *token = strtok(NULL, ":");
763 if (!strcmp(type, "video")) {
764 device_name[0] = token;
765 } else if (!strcmp(type, "audio")) {
766 device_name[1] = token;
768 device_name[0] = NULL;
769 device_name[1] = NULL;
774 if (!device_name[0] && !device_name[1]) {
778 device_name[0] = av_strdup(device_name[0]);
780 device_name[1] = av_strdup(device_name[1]);
787 static int dshow_read_header(AVFormatContext *avctx, AVFormatParameters *ap)
789 struct dshow_ctx *ctx = avctx->priv_data;
790 IGraphBuilder *graph = NULL;
791 ICreateDevEnum *devenum = NULL;
792 IMediaControl *control = NULL;
793 int ret = AVERROR(EIO);
796 if (!ctx->list_devices && !parse_device_name(avctx)) {
797 av_log(avctx, AV_LOG_ERROR, "Malformed dshow input string.\n");
801 if (ctx->video_size) {
802 r = av_parse_video_size(&ctx->requested_width, &ctx->requested_height, ctx->video_size);
804 av_log(avctx, AV_LOG_ERROR, "Could not parse video size '%s'.\n", ctx->video_size);
808 if (ctx->framerate) {
809 r = av_parse_video_rate(&ctx->requested_framerate, ctx->framerate);
811 av_log(avctx, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", ctx->framerate);
818 r = CoCreateInstance(&CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER,
819 &IID_IGraphBuilder, (void **) &graph);
821 av_log(avctx, AV_LOG_ERROR, "Could not create capture graph.\n");
826 r = CoCreateInstance(&CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER,
827 &IID_ICreateDevEnum, (void **) &devenum);
829 av_log(avctx, AV_LOG_ERROR, "Could not enumerate system devices.\n");
833 if (ctx->list_devices) {
834 av_log(avctx, AV_LOG_INFO, "DirectShow video devices\n");
835 dshow_cycle_devices(avctx, devenum, VideoDevice, NULL);
836 av_log(avctx, AV_LOG_INFO, "DirectShow audio devices\n");
837 dshow_cycle_devices(avctx, devenum, AudioDevice, NULL);
841 if (ctx->list_options) {
842 if (ctx->device_name[VideoDevice])
843 dshow_list_device_options(avctx, devenum, VideoDevice);
844 if (ctx->device_name[AudioDevice])
845 dshow_list_device_options(avctx, devenum, AudioDevice);
850 if (ctx->device_name[VideoDevice]) {
851 ret = dshow_open_device(avctx, devenum, VideoDevice);
854 ret = dshow_add_device(avctx, ap, VideoDevice);
858 if (ctx->device_name[AudioDevice]) {
859 ret = dshow_open_device(avctx, devenum, AudioDevice);
862 ret = dshow_add_device(avctx, ap, AudioDevice);
867 ctx->mutex = CreateMutex(NULL, 0, NULL);
869 av_log(avctx, AV_LOG_ERROR, "Could not create Mutex\n");
872 ctx->event = CreateEvent(NULL, 1, 0, NULL);
874 av_log(avctx, AV_LOG_ERROR, "Could not create Event\n");
878 r = IGraphBuilder_QueryInterface(graph, &IID_IMediaControl, (void **) &control);
880 av_log(avctx, AV_LOG_ERROR, "Could not get media control.\n");
883 ctx->control = control;
885 r = IMediaControl_Run(control);
888 r = IMediaControl_GetState(control, 0, &pfs);
891 av_log(avctx, AV_LOG_ERROR, "Could not run filter\n");
900 dshow_read_close(avctx);
903 ICreateDevEnum_Release(devenum);
908 static int dshow_read_packet(AVFormatContext *s, AVPacket *pkt)
910 struct dshow_ctx *ctx = s->priv_data;
911 AVPacketList *pktl = NULL;
914 WaitForSingleObject(ctx->mutex, INFINITE);
917 *pkt = ctx->pktl->pkt;
918 ctx->pktl = ctx->pktl->next;
921 ResetEvent(ctx->event);
922 ReleaseMutex(ctx->mutex);
924 if (s->flags & AVFMT_FLAG_NONBLOCK) {
925 return AVERROR(EAGAIN);
927 WaitForSingleObject(ctx->event, INFINITE);
932 ctx->curbufsize -= pkt->size;
937 #define OFFSET(x) offsetof(struct dshow_ctx, x)
938 #define DEC AV_OPT_FLAG_DECODING_PARAM
939 static const AVOption options[] = {
940 { "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 },
941 { "framerate", "set video frame rate", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
942 { "sample_rate", "set audio sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, DEC },
943 { "sample_size", "set audio sample size", OFFSET(sample_size), AV_OPT_TYPE_INT, {.dbl = 0}, 0, 16, DEC },
944 { "channels", "set number of audio channels, such as 1 or 2", OFFSET(channels), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, DEC },
945 { "list_devices", "list available devices", OFFSET(list_devices), AV_OPT_TYPE_INT, {.dbl=0}, 0, 1, DEC, "list_devices" },
946 { "true", "", 0, AV_OPT_TYPE_CONST, {.dbl=1}, 0, 0, DEC, "list_devices" },
947 { "false", "", 0, AV_OPT_TYPE_CONST, {.dbl=0}, 0, 0, DEC, "list_devices" },
948 { "list_options", "list available options for specified device", OFFSET(list_options), AV_OPT_TYPE_INT, {.dbl=0}, 0, 1, DEC, "list_options" },
949 { "true", "", 0, AV_OPT_TYPE_CONST, {.dbl=1}, 0, 0, DEC, "list_options" },
950 { "false", "", 0, AV_OPT_TYPE_CONST, {.dbl=0}, 0, 0, DEC, "list_options" },
951 { "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 },
952 { "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 },
956 static const AVClass dshow_class = {
957 .class_name = "DirectShow indev",
958 .item_name = av_default_item_name,
960 .version = LIBAVUTIL_VERSION_INT,
963 AVInputFormat ff_dshow_demuxer = {
965 NULL_IF_CONFIG_SMALL("DirectShow capture"),
966 sizeof(struct dshow_ctx),
971 .flags = AVFMT_NOFILE,
972 .priv_class = &dshow_class,