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ffmpeg/libavdevice/dshow.c

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/*
* Directshow capture interface
* Copyright (c) 2010 Ramiro Polla
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "dshow_capture.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/opt.h"
#include "libavutil/mem.h"
#include "libavformat/internal.h"
#include "libavformat/riff.h"
#include "avdevice.h"
#include "libavcodec/raw.h"
#include "objidl.h"
#include "shlwapi.h"
// NB: technically, we should include dxva.h and use
// DXVA_ExtendedFormat, but that type is not defined in
// the MinGW headers. The DXVA2_ExtendedFormat and the
// contents of its fields is identical to
// DXVA_ExtendedFormat (see https://docs.microsoft.com/en-us/windows/win32/medfound/extended-color-information#color-space-in-media-types)
// and is provided by MinGW as well, so we use that
// instead. NB also that per the Microsoft docs, the
// lowest 8 bits of the structure, i.e. the SampleFormat
// field, contain AMCONTROL_xxx flags instead of sample
// format information, and should thus not be used.
// NB further that various values in the structure's
// fields (e.g. BT.2020 color space) are not provided
// for either of the DXVA structs, but are provided in
// the flags of the corresponding fields of Media Foundation.
// These may be provided by DirectShow devices (e.g. LAVFilters
// does so). So we use those values here too (the equivalence is
// indicated by Microsoft example code: https://docs.microsoft.com/en-us/windows/win32/api/dxva2api/ns-dxva2api-dxva2_videodesc)
#include "d3d9types.h"
#include "dxva2api.h"
#ifndef AMCONTROL_COLORINFO_PRESENT
// not defined in some versions of MinGW's dvdmedia.h
# define AMCONTROL_COLORINFO_PRESENT 0x00000080 // if set, indicates DXVA color info is present in the upper (24) bits of the dwControlFlags
#endif
static enum AVPixelFormat dshow_pixfmt(DWORD biCompression, WORD biBitCount)
{
switch(biCompression) {
case BI_BITFIELDS:
case BI_RGB:
switch(biBitCount) { /* 1-8 are untested */
case 1:
return AV_PIX_FMT_MONOWHITE;
case 4:
return AV_PIX_FMT_RGB4;
case 8:
return AV_PIX_FMT_RGB8;
case 16:
return AV_PIX_FMT_RGB555;
case 24:
return AV_PIX_FMT_BGR24;
case 32:
return AV_PIX_FMT_0RGB32;
}
}
return avpriv_find_pix_fmt(avpriv_get_raw_pix_fmt_tags(), biCompression); // all others
}
static enum AVColorRange dshow_color_range(DXVA2_ExtendedFormat *fmt_info)
{
switch (fmt_info->NominalRange)
{
case DXVA2_NominalRange_Unknown:
return AVCOL_RANGE_UNSPECIFIED;
case DXVA2_NominalRange_Normal: // equal to DXVA2_NominalRange_0_255
return AVCOL_RANGE_JPEG;
case DXVA2_NominalRange_Wide: // equal to DXVA2_NominalRange_16_235
return AVCOL_RANGE_MPEG;
case DXVA2_NominalRange_48_208:
// not an ffmpeg color range
return AVCOL_RANGE_UNSPECIFIED;
// values from MediaFoundation SDK (mfobjects.h)
case 4: // MFNominalRange_64_127
// not an ffmpeg color range
return AVCOL_RANGE_UNSPECIFIED;
default:
return AVCOL_RANGE_UNSPECIFIED;
}
}
static enum AVColorSpace dshow_color_space(DXVA2_ExtendedFormat *fmt_info)
{
switch (fmt_info->VideoTransferMatrix)
{
case DXVA2_VideoTransferMatrix_BT709:
return AVCOL_SPC_BT709;
case DXVA2_VideoTransferMatrix_BT601:
return AVCOL_SPC_BT470BG;
case DXVA2_VideoTransferMatrix_SMPTE240M:
return AVCOL_SPC_SMPTE240M;
// values from MediaFoundation SDK (mfobjects.h)
case 4: // MFVideoTransferMatrix_BT2020_10
case 5: // MFVideoTransferMatrix_BT2020_12
if (fmt_info->VideoTransferFunction == 12) // MFVideoTransFunc_2020_const
return AVCOL_SPC_BT2020_CL;
else
return AVCOL_SPC_BT2020_NCL;
default:
return AVCOL_SPC_UNSPECIFIED;
}
}
static enum AVColorPrimaries dshow_color_primaries(DXVA2_ExtendedFormat *fmt_info)
{
switch (fmt_info->VideoPrimaries)
{
case DXVA2_VideoPrimaries_Unknown:
return AVCOL_PRI_UNSPECIFIED;
case DXVA2_VideoPrimaries_reserved:
return AVCOL_PRI_RESERVED;
case DXVA2_VideoPrimaries_BT709:
return AVCOL_PRI_BT709;
case DXVA2_VideoPrimaries_BT470_2_SysM:
return AVCOL_PRI_BT470M;
case DXVA2_VideoPrimaries_BT470_2_SysBG:
case DXVA2_VideoPrimaries_EBU3213: // this is PAL
return AVCOL_PRI_BT470BG;
case DXVA2_VideoPrimaries_SMPTE170M:
case DXVA2_VideoPrimaries_SMPTE_C:
return AVCOL_PRI_SMPTE170M;
case DXVA2_VideoPrimaries_SMPTE240M:
return AVCOL_PRI_SMPTE240M;
// values from MediaFoundation SDK (mfobjects.h)
case 9: // MFVideoPrimaries_BT2020
return AVCOL_PRI_BT2020;
case 10: // MFVideoPrimaries_XYZ
return AVCOL_PRI_SMPTE428;
case 11: // MFVideoPrimaries_DCI_P3
return AVCOL_PRI_SMPTE431;
case 12: // MFVideoPrimaries_ACES (Academy Color Encoding System)
// not an FFmpeg color primary
return AVCOL_PRI_UNSPECIFIED;
default:
return AVCOL_PRI_UNSPECIFIED;
}
}
static enum AVColorTransferCharacteristic dshow_color_trc(DXVA2_ExtendedFormat *fmt_info)
{
switch (fmt_info->VideoTransferFunction)
{
case DXVA2_VideoTransFunc_Unknown:
return AVCOL_TRC_UNSPECIFIED;
case DXVA2_VideoTransFunc_10:
return AVCOL_TRC_LINEAR;
case DXVA2_VideoTransFunc_18:
// not an FFmpeg transfer characteristic
return AVCOL_TRC_UNSPECIFIED;
case DXVA2_VideoTransFunc_20:
// not an FFmpeg transfer characteristic
return AVCOL_TRC_UNSPECIFIED;
case DXVA2_VideoTransFunc_22:
return AVCOL_TRC_GAMMA22;
case DXVA2_VideoTransFunc_709:
return AVCOL_TRC_BT709;
case DXVA2_VideoTransFunc_240M:
return AVCOL_TRC_SMPTE240M;
case DXVA2_VideoTransFunc_sRGB:
return AVCOL_TRC_IEC61966_2_1;
case DXVA2_VideoTransFunc_28:
return AVCOL_TRC_GAMMA28;
// values from MediaFoundation SDK (mfobjects.h)
case 9: // MFVideoTransFunc_Log_100
return AVCOL_TRC_LOG;
case 10: // MFVideoTransFunc_Log_316
return AVCOL_TRC_LOG_SQRT;
case 11: // MFVideoTransFunc_709_sym
// not an FFmpeg transfer characteristic
return AVCOL_TRC_UNSPECIFIED;
case 12: // MFVideoTransFunc_2020_const
case 13: // MFVideoTransFunc_2020
if (fmt_info->VideoTransferMatrix == 5) // MFVideoTransferMatrix_BT2020_12
return AVCOL_TRC_BT2020_12;
else
return AVCOL_TRC_BT2020_10;
case 14: // MFVideoTransFunc_26
// not an FFmpeg transfer characteristic
return AVCOL_TRC_UNSPECIFIED;
case 15: // MFVideoTransFunc_2084
return AVCOL_TRC_SMPTEST2084;
case 16: // MFVideoTransFunc_HLG
return AVCOL_TRC_ARIB_STD_B67;
case 17: // MFVideoTransFunc_10_rel
// not an FFmpeg transfer characteristic? Undocumented also by MS
return AVCOL_TRC_UNSPECIFIED;
default:
return AVCOL_TRC_UNSPECIFIED;
}
}
static enum AVChromaLocation dshow_chroma_loc(DXVA2_ExtendedFormat *fmt_info)
{
if (fmt_info->VideoChromaSubsampling == DXVA2_VideoChromaSubsampling_Cosited) // that is: (DXVA2_VideoChromaSubsampling_Horizontally_Cosited | DXVA2_VideoChromaSubsampling_Vertically_Cosited | DXVA2_VideoChromaSubsampling_Vertically_AlignedChromaPlanes)
return AVCHROMA_LOC_TOPLEFT;
else if (fmt_info->VideoChromaSubsampling == DXVA2_VideoChromaSubsampling_MPEG1) // that is: DXVA2_VideoChromaSubsampling_Vertically_AlignedChromaPlanes
return AVCHROMA_LOC_CENTER;
else if (fmt_info->VideoChromaSubsampling == DXVA2_VideoChromaSubsampling_MPEG2) // that is: (DXVA2_VideoChromaSubsampling_Horizontally_Cosited | DXVA2_VideoChromaSubsampling_Vertically_AlignedChromaPlanes)
return AVCHROMA_LOC_LEFT;
else if (fmt_info->VideoChromaSubsampling == DXVA2_VideoChromaSubsampling_DV_PAL) // that is: (DXVA2_VideoChromaSubsampling_Horizontally_Cosited | DXVA2_VideoChromaSubsampling_Vertically_Cosited)
return AVCHROMA_LOC_TOPLEFT;
else
// unknown
return AVCHROMA_LOC_UNSPECIFIED;
}
static int
dshow_read_close(AVFormatContext *s)
{
struct dshow_ctx *ctx = s->priv_data;
PacketList *pktl;
if (ctx->control) {
IMediaControl_Stop(ctx->control);
IMediaControl_Release(ctx->control);
}
if (ctx->media_event)
IMediaEvent_Release(ctx->media_event);
if (ctx->graph) {
IEnumFilters *fenum;
int r;
r = IGraphBuilder_EnumFilters(ctx->graph, &fenum);
if (r == S_OK) {
IBaseFilter *f;
IEnumFilters_Reset(fenum);
while (IEnumFilters_Next(fenum, 1, &f, NULL) == S_OK) {
if (IGraphBuilder_RemoveFilter(ctx->graph, f) == S_OK)
IEnumFilters_Reset(fenum); /* When a filter is removed,
* the list must be reset. */
IBaseFilter_Release(f);
}
IEnumFilters_Release(fenum);
}
IGraphBuilder_Release(ctx->graph);
}
if (ctx->capture_pin[VideoDevice])
ff_dshow_pin_Release(ctx->capture_pin[VideoDevice]);
if (ctx->capture_pin[AudioDevice])
ff_dshow_pin_Release(ctx->capture_pin[AudioDevice]);
if (ctx->capture_filter[VideoDevice])
ff_dshow_filter_Release(ctx->capture_filter[VideoDevice]);
if (ctx->capture_filter[AudioDevice])
ff_dshow_filter_Release(ctx->capture_filter[AudioDevice]);
if (ctx->device_pin[VideoDevice])
IPin_Release(ctx->device_pin[VideoDevice]);
if (ctx->device_pin[AudioDevice])
IPin_Release(ctx->device_pin[AudioDevice]);
if (ctx->device_filter[VideoDevice])
IBaseFilter_Release(ctx->device_filter[VideoDevice]);
if (ctx->device_filter[AudioDevice])
IBaseFilter_Release(ctx->device_filter[AudioDevice]);
av_freep(&ctx->device_name[0]);
av_freep(&ctx->device_name[1]);
av_freep(&ctx->device_unique_name[0]);
av_freep(&ctx->device_unique_name[1]);
if(ctx->mutex)
CloseHandle(ctx->mutex);
if(ctx->event[0])
CloseHandle(ctx->event[0]);
if(ctx->event[1])
CloseHandle(ctx->event[1]);
pktl = ctx->pktl;
while (pktl) {
PacketList *next = pktl->next;
av_packet_unref(&pktl->pkt);
av_free(pktl);
pktl = next;
}
CoUninitialize();
return 0;
}
static char *dup_wchar_to_utf8(wchar_t *w)
{
char *s = NULL;
int l = WideCharToMultiByte(CP_UTF8, 0, w, -1, 0, 0, 0, 0);
s = av_malloc(l);
if (s)
WideCharToMultiByte(CP_UTF8, 0, w, -1, s, l, 0, 0);
return s;
}
static int shall_we_drop(AVFormatContext *s, int index, enum dshowDeviceType devtype)
{
struct dshow_ctx *ctx = s->priv_data;
static const uint8_t dropscore[] = {62, 75, 87, 100};
const int ndropscores = FF_ARRAY_ELEMS(dropscore);
unsigned int buffer_fullness = (ctx->curbufsize[index]*100)/s->max_picture_buffer;
const char *devtypename = (devtype == VideoDevice) ? "video" : "audio";
if(dropscore[++ctx->video_frame_num%ndropscores] <= buffer_fullness) {
av_log(s, AV_LOG_ERROR,
"real-time buffer [%s] [%s input] too full or near too full (%d%% of size: %d [rtbufsize parameter])! frame dropped!\n",
ctx->device_name[devtype], devtypename, buffer_fullness, s->max_picture_buffer);
return 1;
}
return 0;
}
static void
callback(void *priv_data, int index, uint8_t *buf, int buf_size, int64_t time, enum dshowDeviceType devtype)
{
AVFormatContext *s = priv_data;
struct dshow_ctx *ctx = s->priv_data;
PacketList **ppktl, *pktl_next;
// dump_videohdr(s, vdhdr);
WaitForSingleObject(ctx->mutex, INFINITE);
if(shall_we_drop(s, index, devtype))
goto fail;
pktl_next = av_mallocz(sizeof(PacketList));
if(!pktl_next)
goto fail;
if(av_new_packet(&pktl_next->pkt, buf_size) < 0) {
av_free(pktl_next);
goto fail;
}
pktl_next->pkt.stream_index = index;
pktl_next->pkt.pts = time;
memcpy(pktl_next->pkt.data, buf, buf_size);
for(ppktl = &ctx->pktl ; *ppktl ; ppktl = &(*ppktl)->next);
*ppktl = pktl_next;
ctx->curbufsize[index] += buf_size;
SetEvent(ctx->event[1]);
ReleaseMutex(ctx->mutex);
return;
fail:
ReleaseMutex(ctx->mutex);
return;
}
static void
dshow_get_device_media_types(AVFormatContext *avctx, enum dshowDeviceType devtype,
enum dshowSourceFilterType sourcetype, IBaseFilter *device_filter,
enum AVMediaType **media_types, int *nb_media_types)
{
IEnumPins *pins = 0;
IPin *pin;
int has_audio = 0, has_video = 0;
if (IBaseFilter_EnumPins(device_filter, &pins) != S_OK)
return;
while (IEnumPins_Next(pins, 1, &pin, NULL) == S_OK) {
IKsPropertySet *p = NULL;
PIN_INFO info = { 0 };
GUID category;
DWORD r2;
IEnumMediaTypes *types = NULL;
AM_MEDIA_TYPE *type;
if (IPin_QueryPinInfo(pin, &info) != S_OK)
goto next;
IBaseFilter_Release(info.pFilter);
if (info.dir != PINDIR_OUTPUT)
goto next;
if (IPin_QueryInterface(pin, &IID_IKsPropertySet, (void **) &p) != S_OK)
goto next;
if (IKsPropertySet_Get(p, &AMPROPSETID_Pin, AMPROPERTY_PIN_CATEGORY,
NULL, 0, &category, sizeof(GUID), &r2) != S_OK)
goto next;
if (!IsEqualGUID(&category, &PIN_CATEGORY_CAPTURE))
goto next;
if (IPin_EnumMediaTypes(pin, &types) != S_OK)
goto next;
// enumerate media types exposed by pin
// NB: don't know if a pin can expose both audio and video, check 'm all to be safe
IEnumMediaTypes_Reset(types);
while (IEnumMediaTypes_Next(types, 1, &type, NULL) == S_OK) {
if (IsEqualGUID(&type->majortype, &MEDIATYPE_Video)) {
has_video = 1;
} else if (IsEqualGUID(&type->majortype, &MEDIATYPE_Audio)) {
has_audio = 1;
}
CoTaskMemFree(type);
}
next:
if (types)
IEnumMediaTypes_Release(types);
if (p)
IKsPropertySet_Release(p);
if (pin)
IPin_Release(pin);
}
IEnumPins_Release(pins);
if (has_audio || has_video) {
int nb_types = has_audio + has_video;
*media_types = av_malloc_array(nb_types, sizeof(enum AVMediaType));
if (*media_types) {
if (has_audio)
(*media_types)[0] = AVMEDIA_TYPE_AUDIO;
if (has_video)
(*media_types)[0 + has_audio] = AVMEDIA_TYPE_VIDEO;
*nb_media_types = nb_types;
}
}
}
/**
* Cycle through available devices using the device enumerator devenum,
* retrieve the device with type specified by devtype and return the
* pointer to the object found in *pfilter.
* If pfilter is NULL, list all device names.
* If device_list is not NULL, populate it with found devices instead of
* outputting device names to log
*/
static int
dshow_cycle_devices(AVFormatContext *avctx, ICreateDevEnum *devenum,
enum dshowDeviceType devtype, enum dshowSourceFilterType sourcetype,
IBaseFilter **pfilter, char **device_unique_name,
AVDeviceInfoList **device_list)
{
struct dshow_ctx *ctx = avctx->priv_data;
IBaseFilter *device_filter = NULL;
IEnumMoniker *classenum = NULL;
IMoniker *m = NULL;
const char *device_name = ctx->device_name[devtype];
int skip = (devtype == VideoDevice) ? ctx->video_device_number
: ctx->audio_device_number;
int r;
const GUID *device_guid[2] = { &CLSID_VideoInputDeviceCategory,
&CLSID_AudioInputDeviceCategory };
const char *devtypename = (devtype == VideoDevice) ? "video" : "audio only";
const char *sourcetypename = (sourcetype == VideoSourceDevice) ? "video" : "audio";
r = ICreateDevEnum_CreateClassEnumerator(devenum, device_guid[sourcetype],
(IEnumMoniker **) &classenum, 0);
if (r != S_OK) {
av_log(avctx, AV_LOG_ERROR, "Could not enumerate %s devices (or none found).\n",
devtypename);
return AVERROR(EIO);
}
while (!device_filter && IEnumMoniker_Next(classenum, 1, &m, NULL) == S_OK) {
IPropertyBag *bag = NULL;
char *friendly_name = NULL;
char *unique_name = NULL;
VARIANT var;
IBindCtx *bind_ctx = NULL;
LPOLESTR olestr = NULL;
LPMALLOC co_malloc = NULL;
AVDeviceInfo *device = NULL;
enum AVMediaType *media_types = NULL;
int nb_media_types = 0;
int i;
r = CoGetMalloc(1, &co_malloc);
if (r != S_OK)
goto fail;
r = CreateBindCtx(0, &bind_ctx);
if (r != S_OK)
goto fail;
/* GetDisplayname works for both video and audio, DevicePath doesn't */
r = IMoniker_GetDisplayName(m, bind_ctx, NULL, &olestr);
if (r != S_OK)
goto fail;
unique_name = dup_wchar_to_utf8(olestr);
/* replace ':' with '_' since we use : to delineate between sources */
for (i = 0; i < strlen(unique_name); i++) {
if (unique_name[i] == ':')
unique_name[i] = '_';
}
r = IMoniker_BindToStorage(m, 0, 0, &IID_IPropertyBag, (void *) &bag);
if (r != S_OK)
goto fail;
var.vt = VT_BSTR;
r = IPropertyBag_Read(bag, L"FriendlyName", &var, NULL);
if (r != S_OK)
goto fail;
friendly_name = dup_wchar_to_utf8(var.bstrVal);
if (pfilter) {
if (strcmp(device_name, friendly_name) && strcmp(device_name, unique_name))
goto fail;
if (!skip--) {
r = IMoniker_BindToObject(m, 0, 0, &IID_IBaseFilter, (void *) &device_filter);
if (r != S_OK) {
av_log(avctx, AV_LOG_ERROR, "Unable to BindToObject for %s\n", device_name);
goto fail;
}
*device_unique_name = unique_name;
unique_name = NULL;
// success, loop will end now
}
} else {
// get media types exposed by pins of device
if (IMoniker_BindToObject(m, 0, 0, &IID_IBaseFilter, (void* ) &device_filter) == S_OK) {
dshow_get_device_media_types(avctx, devtype, sourcetype, device_filter, &media_types, &nb_media_types);
IBaseFilter_Release(device_filter);
device_filter = NULL;
}
if (device_list) {
device = av_mallocz(sizeof(AVDeviceInfo));
if (!device)
goto fail;
device->device_name = av_strdup(friendly_name);
device->device_description = av_strdup(unique_name);
if (!device->device_name || !device->device_description)
goto fail;
// make space in device_list for this new device
if (av_reallocp_array(&(*device_list)->devices,
(*device_list)->nb_devices + 1,
sizeof(*(*device_list)->devices)) < 0)
goto fail;
// attach media_types to device
device->nb_media_types = nb_media_types;
device->media_types = media_types;
nb_media_types = 0;
media_types = NULL;
// store device in list
(*device_list)->devices[(*device_list)->nb_devices] = device;
(*device_list)->nb_devices++;
device = NULL; // copied into array, make sure not freed below
}
else {
av_log(avctx, AV_LOG_INFO, "\"%s\"", friendly_name);
if (nb_media_types > 0) {
const char* media_type = av_get_media_type_string(media_types[0]);
av_log(avctx, AV_LOG_INFO, " (%s", media_type ? media_type : "unknown");
for (int i = 1; i < nb_media_types; ++i) {
media_type = av_get_media_type_string(media_types[i]);
av_log(avctx, AV_LOG_INFO, ", %s", media_type ? media_type : "unknown");
}
av_log(avctx, AV_LOG_INFO, ")");
} else {
av_log(avctx, AV_LOG_INFO, " (none)");
}
av_log(avctx, AV_LOG_INFO, "\n");
av_log(avctx, AV_LOG_INFO, " Alternative name \"%s\"\n", unique_name);
}
}
fail:
av_freep(&media_types);
if (device) {
av_freep(&device->device_name);
av_freep(&device->device_description);
// NB: no need to av_freep(&device->media_types), its only moved to device once nothing can fail anymore
av_free(device);
}
if (olestr && co_malloc)
IMalloc_Free(co_malloc, olestr);
if (bind_ctx)
IBindCtx_Release(bind_ctx);
av_freep(&friendly_name);
av_freep(&unique_name);
if (bag)
IPropertyBag_Release(bag);
IMoniker_Release(m);
}
IEnumMoniker_Release(classenum);
if (pfilter) {
if (!device_filter) {
av_log(avctx, AV_LOG_ERROR, "Could not find %s device with name [%s] among source devices of type %s.\n",
devtypename, device_name, sourcetypename);
return AVERROR(EIO);
}
*pfilter = device_filter;
}
return 0;
}
static int dshow_get_device_list(AVFormatContext *avctx, AVDeviceInfoList *device_list)
{
ICreateDevEnum *devenum = NULL;
int r;
int ret = AVERROR(EIO);
if (!device_list)
return AVERROR(EINVAL);
CoInitialize(0);
r = CoCreateInstance(&CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER,
&IID_ICreateDevEnum, (void**)&devenum);
if (r != S_OK) {
av_log(avctx, AV_LOG_ERROR, "Could not enumerate system devices.\n");
goto error;
}
ret = dshow_cycle_devices(avctx, devenum, VideoDevice, VideoSourceDevice, NULL, NULL, &device_list);
if (ret < S_OK)
goto error;
ret = dshow_cycle_devices(avctx, devenum, AudioDevice, AudioSourceDevice, NULL, NULL, &device_list);
error:
if (devenum)
ICreateDevEnum_Release(devenum);
CoUninitialize();
return ret;
}
static int dshow_should_set_format(AVFormatContext *avctx, enum dshowDeviceType devtype)
{
struct dshow_ctx *ctx = avctx->priv_data;
return (devtype == VideoDevice && (ctx->framerate ||
(ctx->requested_width && ctx->requested_height) ||
ctx->pixel_format != AV_PIX_FMT_NONE ||
ctx->video_codec_id != AV_CODEC_ID_RAWVIDEO))
|| (devtype == AudioDevice && (ctx->channels || ctx->sample_size || ctx->sample_rate));
}
struct dshow_format_info {
enum dshowDeviceType devtype;
// video
int64_t framerate;
enum AVPixelFormat pix_fmt;
enum AVCodecID codec_id;
enum AVColorRange col_range;
enum AVColorSpace col_space;
enum AVColorPrimaries col_prim;
enum AVColorTransferCharacteristic col_trc;
enum AVChromaLocation chroma_loc;
int width;
int height;
// audio
int sample_rate;
int sample_size;
int channels;
};
// user must av_free the returned pointer
static struct dshow_format_info *dshow_get_format_info(AM_MEDIA_TYPE *type)
{
struct dshow_format_info *fmt_info = NULL;
BITMAPINFOHEADER *bih;
DXVA2_ExtendedFormat *extended_format_info = NULL;
WAVEFORMATEX *fx;
enum dshowDeviceType devtype;
int64_t framerate;
if (!type)
return NULL;
if (IsEqualGUID(&type->formattype, &FORMAT_VideoInfo)) {
VIDEOINFOHEADER *v = (void *) type->pbFormat;
framerate = v->AvgTimePerFrame;
bih = &v->bmiHeader;
devtype = VideoDevice;
} else if (IsEqualGUID(&type->formattype, &FORMAT_VideoInfo2)) {
VIDEOINFOHEADER2 *v = (void *) type->pbFormat;
devtype = VideoDevice;
framerate = v->AvgTimePerFrame;
bih = &v->bmiHeader;
if (v->dwControlFlags & AMCONTROL_COLORINFO_PRESENT)
extended_format_info = (DXVA2_ExtendedFormat *) &v->dwControlFlags;
} else if (IsEqualGUID(&type->formattype, &FORMAT_WaveFormatEx)) {
fx = (void *) type->pbFormat;
devtype = AudioDevice;
} else {
return NULL;
}
fmt_info = av_mallocz(sizeof(struct dshow_format_info));
if (!fmt_info)
return NULL;
// initialize fields where unset is not zero
fmt_info->pix_fmt = AV_PIX_FMT_NONE;
fmt_info->col_space = AVCOL_SPC_UNSPECIFIED;
fmt_info->col_prim = AVCOL_PRI_UNSPECIFIED;
fmt_info->col_trc = AVCOL_TRC_UNSPECIFIED;
// now get info about format
fmt_info->devtype = devtype;
if (devtype == VideoDevice) {
fmt_info->width = bih->biWidth;
fmt_info->height = bih->biHeight;
fmt_info->framerate = framerate;
fmt_info->pix_fmt = dshow_pixfmt(bih->biCompression, bih->biBitCount);
if (fmt_info->pix_fmt == AV_PIX_FMT_NONE) {
const AVCodecTag *const tags[] = { avformat_get_riff_video_tags(), NULL };
fmt_info->codec_id = av_codec_get_id(tags, bih->biCompression);
}
else
fmt_info->codec_id = AV_CODEC_ID_RAWVIDEO;
if (extended_format_info) {
fmt_info->col_range = dshow_color_range(extended_format_info);
fmt_info->col_space = dshow_color_space(extended_format_info);
fmt_info->col_prim = dshow_color_primaries(extended_format_info);
fmt_info->col_trc = dshow_color_trc(extended_format_info);
fmt_info->chroma_loc = dshow_chroma_loc(extended_format_info);
}
} else {
fmt_info->sample_rate = fx->nSamplesPerSec;
fmt_info->sample_size = fx->wBitsPerSample;
fmt_info->channels = fx->nChannels;
}
return fmt_info;
}
/**
* Cycle through available formats available from the specified pin,
* try to set parameters specified through AVOptions, or the pin's
* default format if no such parameters were set. If successful,
* return 1 in *pformat_set.
* If pformat_set is NULL, list all pin capabilities.
*/
static void
dshow_cycle_formats(AVFormatContext *avctx, enum dshowDeviceType devtype,
IPin *pin, int *pformat_set)
{
struct dshow_ctx *ctx = avctx->priv_data;
IAMStreamConfig *config = NULL;
AM_MEDIA_TYPE *type = NULL;
AM_MEDIA_TYPE *previous_match_type = NULL;
int format_set = 0;
void *caps = NULL;
int i, n, size, r;
int wait_for_better = 0;
int use_default;
// format parameters requested by user
// if none are requested by user, the values will below be set to
// those of the default format
// video
enum AVCodecID requested_video_codec_id = ctx->video_codec_id;
enum AVPixelFormat requested_pixel_format = ctx->pixel_format;
int64_t requested_framerate = ctx->framerate ? ((int64_t)ctx->requested_framerate.den * 10000000)
/ ctx->requested_framerate.num : 0;
int requested_width = ctx->requested_width;
int requested_height = ctx->requested_height;
// audio
int requested_sample_rate = ctx->sample_rate;
int requested_sample_size = ctx->sample_size;
int requested_channels = ctx->channels;
if (IPin_QueryInterface(pin, &IID_IAMStreamConfig, (void **) &config) != S_OK)
return;
if (IAMStreamConfig_GetNumberOfCapabilities(config, &n, &size) != S_OK)
goto end;
caps = av_malloc(size);
if (!caps)
goto end;
/**
* If we should open the device with the default format,
* then:
* 1. check what the format of the default device is, and
* 2. below we iterate all formats till we find a matching
* one, with most info exposed (see comment below).
*/
use_default = !dshow_should_set_format(avctx, devtype);
if (use_default && pformat_set)
{
HRESULT hr;
// get default
if ((hr = IAMStreamConfig_GetFormat(config, &type)) != S_OK) {
if (hr == E_NOTIMPL || !IsEqualGUID(&type->majortype, devtype==VideoDevice ? &MEDIATYPE_Video : &MEDIATYPE_Audio)) {
// default not available or of wrong type,
// fall back to iterating exposed formats
// until one of the right type is found
IEnumMediaTypes *types = NULL;
if (IPin_EnumMediaTypes(pin, &types) != S_OK)
goto end;
IEnumMediaTypes_Reset(types);
while (IEnumMediaTypes_Next(types, 1, &type, NULL) == S_OK) {
if (IsEqualGUID(&type->majortype, devtype==VideoDevice ? &MEDIATYPE_Video : &MEDIATYPE_Audio)) {
break;
}
CoTaskMemFree(type);
type = NULL;
}
IEnumMediaTypes_Release(types);
}
if (!type)
// this pin does not expose any formats of the expected type
goto end;
}
if (type) {
// interrogate default format, so we know what to search for below
struct dshow_format_info *fmt_info = dshow_get_format_info(type);
if (fmt_info) {
if (fmt_info->devtype == VideoDevice) {
requested_video_codec_id = fmt_info->codec_id;
requested_pixel_format = fmt_info->pix_fmt;
requested_framerate = fmt_info->framerate;
requested_width = fmt_info->width;
requested_height = fmt_info->height;
} else {
requested_sample_rate = fmt_info->sample_rate;
requested_sample_size = fmt_info->sample_size;
requested_channels = fmt_info->channels;
}
av_free(fmt_info); // free but don't set to NULL to enable below check
}
if (type && type->pbFormat)
CoTaskMemFree(type->pbFormat);
CoTaskMemFree(type);
type = NULL;
if (!fmt_info)
// default format somehow invalid, can't continue with this pin
goto end;
fmt_info = NULL;
}
}
// NB: some devices (e.g. Logitech C920) expose each video format twice:
// both a format containing a VIDEOINFOHEADER and a format containing
// a VIDEOINFOHEADER2. We want, if possible, to select a format with a
// VIDEOINFOHEADER2, as this potentially provides more info about the
// format. So, if in the iteration below we have found a matching format,
// but it is a VIDEOINFOHEADER, keep looking for a matching format that
// exposes contains a VIDEOINFOHEADER2. Fall back to the VIDEOINFOHEADER
// format if no corresponding VIDEOINFOHEADER2 is found when we finish
// iterating.
for (i = 0; i < n && !format_set; i++) {
struct dshow_format_info *fmt_info = NULL;
r = IAMStreamConfig_GetStreamCaps(config, i, &type, (void *) caps);
if (r != S_OK)
goto next;
#if DSHOWDEBUG
ff_print_AM_MEDIA_TYPE(type);
#endif
fmt_info = dshow_get_format_info(type);
if (!fmt_info)
goto next;
if (devtype == VideoDevice) {
VIDEO_STREAM_CONFIG_CAPS *vcaps = caps;
BITMAPINFOHEADER *bih;
int64_t *fr;
#if DSHOWDEBUG
ff_print_VIDEO_STREAM_CONFIG_CAPS(vcaps);
#endif
if (fmt_info->devtype != VideoDevice)
goto next;
if (IsEqualGUID(&type->formattype, &FORMAT_VideoInfo)) {
VIDEOINFOHEADER *v = (void *) type->pbFormat;
fr = &v->AvgTimePerFrame;
bih = &v->bmiHeader;
wait_for_better = 1;
} else if (IsEqualGUID(&type->formattype, &FORMAT_VideoInfo2)) {
VIDEOINFOHEADER2 *v = (void *) type->pbFormat;
fr = &v->AvgTimePerFrame;
bih = &v->bmiHeader;
wait_for_better = 0;
}
if (!pformat_set) {
const char *chroma = av_chroma_location_name(fmt_info->chroma_loc);
if (fmt_info->pix_fmt == AV_PIX_FMT_NONE) {
const AVCodec *codec = avcodec_find_decoder(fmt_info->codec_id);
if (fmt_info->codec_id == AV_CODEC_ID_NONE || !codec) {
av_log(avctx, AV_LOG_INFO, " unknown compression type 0x%X", (int) bih->biCompression);
} else {
av_log(avctx, AV_LOG_INFO, " vcodec=%s", codec->name);
}
} else {
av_log(avctx, AV_LOG_INFO, " pixel_format=%s", av_get_pix_fmt_name(fmt_info->pix_fmt));
}
av_log(avctx, AV_LOG_INFO, " min s=%ldx%ld fps=%g max s=%ldx%ld fps=%g",
vcaps->MinOutputSize.cx, vcaps->MinOutputSize.cy,
1e7 / vcaps->MaxFrameInterval,
vcaps->MaxOutputSize.cx, vcaps->MaxOutputSize.cy,
1e7 / vcaps->MinFrameInterval);
if (fmt_info->col_range != AVCOL_RANGE_UNSPECIFIED ||
fmt_info->col_space != AVCOL_SPC_UNSPECIFIED ||
fmt_info->col_prim != AVCOL_PRI_UNSPECIFIED ||
fmt_info->col_trc != AVCOL_TRC_UNSPECIFIED) {
const char *range = av_color_range_name(fmt_info->col_range);
const char *space = av_color_space_name(fmt_info->col_space);
const char *prim = av_color_primaries_name(fmt_info->col_prim);
const char *trc = av_color_transfer_name(fmt_info->col_trc);
av_log(avctx, AV_LOG_INFO, " (%s, %s/%s/%s",
range ? range : "unknown",
space ? space : "unknown",
prim ? prim : "unknown",
trc ? trc : "unknown");
if (fmt_info->chroma_loc != AVCHROMA_LOC_UNSPECIFIED)
av_log(avctx, AV_LOG_INFO, ", %s", chroma ? chroma : "unknown");
av_log(avctx, AV_LOG_INFO, ")");
}
else if (fmt_info->chroma_loc != AVCHROMA_LOC_UNSPECIFIED)
av_log(avctx, AV_LOG_INFO, "(%s)", chroma ? chroma : "unknown");
av_log(avctx, AV_LOG_INFO, "\n");
continue;
}
if (requested_video_codec_id != AV_CODEC_ID_RAWVIDEO) {
if (requested_video_codec_id != fmt_info->codec_id)
goto next;
}
if (requested_pixel_format != AV_PIX_FMT_NONE &&
requested_pixel_format != fmt_info->pix_fmt) {
goto next;
}
if (requested_framerate) {
if (requested_framerate > vcaps->MaxFrameInterval ||
requested_framerate < vcaps->MinFrameInterval)
goto next;
*fr = requested_framerate;
}
if (requested_width && requested_height) {
if (requested_width > vcaps->MaxOutputSize.cx ||
requested_width < vcaps->MinOutputSize.cx ||
requested_height > vcaps->MaxOutputSize.cy ||
requested_height < vcaps->MinOutputSize.cy)
goto next;
bih->biWidth = requested_width;
bih->biHeight = requested_height;
}
} else {
WAVEFORMATEX *fx;
AUDIO_STREAM_CONFIG_CAPS *acaps = caps;
#if DSHOWDEBUG
ff_print_AUDIO_STREAM_CONFIG_CAPS(acaps);
#endif
if (IsEqualGUID(&type->formattype, &FORMAT_WaveFormatEx)) {
fx = (void *) type->pbFormat;
} else {
goto next;
}
if (!pformat_set) {
av_log(
avctx,
AV_LOG_INFO,
" ch=%2u, bits=%2u, rate=%6lu\n",
fx->nChannels, fx->wBitsPerSample, fx->nSamplesPerSec
);
continue;
}
if (requested_sample_rate) {
if (requested_sample_rate > acaps->MaximumSampleFrequency ||
requested_sample_rate < acaps->MinimumSampleFrequency)
goto next;
fx->nSamplesPerSec = requested_sample_rate;
}
if (requested_sample_size) {
if (requested_sample_size > acaps->MaximumBitsPerSample ||
requested_sample_size < acaps->MinimumBitsPerSample)
goto next;
fx->wBitsPerSample = requested_sample_size;
}
if (requested_channels) {
if (requested_channels > acaps->MaximumChannels ||
requested_channels < acaps->MinimumChannels)
goto next;
fx->nChannels = requested_channels;
}
}
// found a matching format. Either apply or store
// for safekeeping if we might maybe find a better
// format with more info attached to it (see comment
// above loop)
if (!wait_for_better) {
if (IAMStreamConfig_SetFormat(config, type) != S_OK)
goto next;
format_set = 1;
}
else if (!previous_match_type) {
// store this matching format for possible later use.
// If we have already found a matching format, ignore it
previous_match_type = type;
type = NULL;
}
next:
av_freep(&fmt_info);
if (type && type->pbFormat)
CoTaskMemFree(type->pbFormat);
CoTaskMemFree(type);
}
// previously found a matching VIDEOINFOHEADER format and stored
// it for safe keeping. Searching further for a matching
// VIDEOINFOHEADER2 format yielded nothing. So set the pin's
// format based on the VIDEOINFOHEADER format.
// NB: this never applies to an audio format because
// previous_match_type always NULL in that case
if (!format_set && previous_match_type) {
if (IAMStreamConfig_SetFormat(config, previous_match_type) == S_OK)
format_set = 1;
}
end:
if (previous_match_type && previous_match_type->pbFormat)
CoTaskMemFree(previous_match_type->pbFormat);
CoTaskMemFree(previous_match_type);
IAMStreamConfig_Release(config);
av_free(caps);
if (pformat_set)
*pformat_set = format_set;
}
/**
* Set audio device buffer size in milliseconds (which can directly impact
* latency, depending on the device).
*/
static int
dshow_set_audio_buffer_size(AVFormatContext *avctx, IPin *pin)
{
struct dshow_ctx *ctx = avctx->priv_data;
IAMBufferNegotiation *buffer_negotiation = NULL;
ALLOCATOR_PROPERTIES props = { -1, -1, -1, -1 };
IAMStreamConfig *config = NULL;
AM_MEDIA_TYPE *type = NULL;
int ret = AVERROR(EIO);
if (IPin_QueryInterface(pin, &IID_IAMStreamConfig, (void **) &config) != S_OK)
goto end;
if (IAMStreamConfig_GetFormat(config, &type) != S_OK)
goto end;
if (!IsEqualGUID(&type->formattype, &FORMAT_WaveFormatEx))
goto end;
props.cbBuffer = (((WAVEFORMATEX *) type->pbFormat)->nAvgBytesPerSec)
* ctx->audio_buffer_size / 1000;
if (IPin_QueryInterface(pin, &IID_IAMBufferNegotiation, (void **) &buffer_negotiation) != S_OK)
goto end;
if (IAMBufferNegotiation_SuggestAllocatorProperties(buffer_negotiation, &props) != S_OK)
goto end;
ret = 0;
end:
if (buffer_negotiation)
IAMBufferNegotiation_Release(buffer_negotiation);
if (type) {
if (type->pbFormat)
CoTaskMemFree(type->pbFormat);
CoTaskMemFree(type);
}
if (config)
IAMStreamConfig_Release(config);
return ret;
}
/**
* Pops up a user dialog allowing them to adjust properties for the given filter, if possible.
*/
void
ff_dshow_show_filter_properties(IBaseFilter *device_filter, AVFormatContext *avctx) {
ISpecifyPropertyPages *property_pages = NULL;
IUnknown *device_filter_iunknown = NULL;
HRESULT hr;
FILTER_INFO filter_info = {0}; /* a warning on this line is false positive GCC bug 53119 AFAICT */
CAUUID ca_guid = {0};
hr = IBaseFilter_QueryInterface(device_filter, &IID_ISpecifyPropertyPages, (void **)&property_pages);
if (hr != S_OK) {
av_log(avctx, AV_LOG_WARNING, "requested filter does not have a property page to show");
goto end;
}
hr = IBaseFilter_QueryFilterInfo(device_filter, &filter_info);
if (hr != S_OK) {
goto fail;
}
hr = IBaseFilter_QueryInterface(device_filter, &IID_IUnknown, (void **)&device_filter_iunknown);
if (hr != S_OK) {
goto fail;
}
hr = ISpecifyPropertyPages_GetPages(property_pages, &ca_guid);
if (hr != S_OK) {
goto fail;
}
hr = OleCreatePropertyFrame(NULL, 0, 0, filter_info.achName, 1, &device_filter_iunknown, ca_guid.cElems,
ca_guid.pElems, 0, 0, NULL);
if (hr != S_OK) {
goto fail;
}
goto end;
fail:
av_log(avctx, AV_LOG_ERROR, "Failure showing property pages for filter");
end:
if (property_pages)
ISpecifyPropertyPages_Release(property_pages);
if (device_filter_iunknown)
IUnknown_Release(device_filter_iunknown);
if (filter_info.pGraph)
IFilterGraph_Release(filter_info.pGraph);
if (ca_guid.pElems)
CoTaskMemFree(ca_guid.pElems);
}
/**
* Cycle through available pins using the device_filter device, of type
* devtype, retrieve the first output pin and return the pointer to the
* object found in *ppin.
* If ppin is NULL, cycle through all pins listing audio/video capabilities.
*/
static int
dshow_cycle_pins(AVFormatContext *avctx, enum dshowDeviceType devtype,
enum dshowSourceFilterType sourcetype, IBaseFilter *device_filter, IPin **ppin)
{
struct dshow_ctx *ctx = avctx->priv_data;
IEnumPins *pins = 0;
IPin *device_pin = NULL;
IPin *pin;
int r;
const char *devtypename = (devtype == VideoDevice) ? "video" : "audio only";
const char *sourcetypename = (sourcetype == VideoSourceDevice) ? "video" : "audio";
int set_format = dshow_should_set_format(avctx, devtype);
int format_set = 0;
int should_show_properties = (devtype == VideoDevice) ? ctx->show_video_device_dialog : ctx->show_audio_device_dialog;
if (should_show_properties)
ff_dshow_show_filter_properties(device_filter, avctx);
r = IBaseFilter_EnumPins(device_filter, &pins);
if (r != S_OK) {
av_log(avctx, AV_LOG_ERROR, "Could not enumerate pins.\n");
return AVERROR(EIO);
}
if (!ppin) {
av_log(avctx, AV_LOG_INFO, "DirectShow %s device options (from %s devices)\n",
devtypename, sourcetypename);
}
while (!device_pin && IEnumPins_Next(pins, 1, &pin, NULL) == S_OK) {
IKsPropertySet *p = NULL;
PIN_INFO info = {0};
GUID category;
DWORD r2;
char *name_buf = NULL;
wchar_t *pin_id = NULL;
char *pin_buf = NULL;
char *desired_pin_name = devtype == VideoDevice ? ctx->video_pin_name : ctx->audio_pin_name;
IPin_QueryPinInfo(pin, &info);
IBaseFilter_Release(info.pFilter);
if (info.dir != PINDIR_OUTPUT)
goto next;
if (IPin_QueryInterface(pin, &IID_IKsPropertySet, (void **) &p) != S_OK)
goto next;
if (IKsPropertySet_Get(p, &AMPROPSETID_Pin, AMPROPERTY_PIN_CATEGORY,
NULL, 0, &category, sizeof(GUID), &r2) != S_OK)
goto next;
if (!IsEqualGUID(&category, &PIN_CATEGORY_CAPTURE))
goto next;
name_buf = dup_wchar_to_utf8(info.achName);
r = IPin_QueryId(pin, &pin_id);
if (r != S_OK) {
av_log(avctx, AV_LOG_ERROR, "Could not query pin id\n");
return AVERROR(EIO);
}
pin_buf = dup_wchar_to_utf8(pin_id);
if (!ppin) {
av_log(avctx, AV_LOG_INFO, " Pin \"%s\" (alternative pin name \"%s\")\n", name_buf, pin_buf);
dshow_cycle_formats(avctx, devtype, pin, NULL);
goto next;
}
if (desired_pin_name) {
if(strcmp(name_buf, desired_pin_name) && strcmp(pin_buf, desired_pin_name)) {
av_log(avctx, AV_LOG_DEBUG, "skipping pin \"%s\" (\"%s\") != requested \"%s\"\n",
name_buf, pin_buf, desired_pin_name);
goto next;
}
}
// will either try to find format matching options supplied by user
// or try to open default format. Successful if returns with format_set==1
dshow_cycle_formats(avctx, devtype, pin, &format_set);
if (!format_set) {
goto next;
}
if (devtype == AudioDevice && ctx->audio_buffer_size) {
if (dshow_set_audio_buffer_size(avctx, pin) < 0) {
av_log(avctx, AV_LOG_ERROR, "unable to set audio buffer size %d to pin, using pin anyway...", ctx->audio_buffer_size);
}
}
if (format_set) {
device_pin = pin;
av_log(avctx, AV_LOG_DEBUG, "Selecting pin %s on %s\n", name_buf, devtypename);
}
next:
if (p)
IKsPropertySet_Release(p);
if (device_pin != pin)
IPin_Release(pin);
av_free(name_buf);
av_free(pin_buf);
if (pin_id)
CoTaskMemFree(pin_id);
}
IEnumPins_Release(pins);
if (ppin) {
if (set_format && !format_set) {
av_log(avctx, AV_LOG_ERROR, "Could not set %s options\n", devtypename);
return AVERROR(EIO);
}
if (!device_pin) {
av_log(avctx, AV_LOG_ERROR,
"Could not find output pin from %s capture device.\n", devtypename);
return AVERROR(EIO);
}
*ppin = device_pin;
}
return 0;
}
/**
* List options for device with type devtype, source filter type sourcetype
*
* @param devenum device enumerator used for accessing the device
*/
static int
dshow_list_device_options(AVFormatContext *avctx, ICreateDevEnum *devenum,
enum dshowDeviceType devtype, enum dshowSourceFilterType sourcetype)
{
struct dshow_ctx *ctx = avctx->priv_data;
IBaseFilter *device_filter = NULL;
char *device_unique_name = NULL;
int r;
if ((r = dshow_cycle_devices(avctx, devenum, devtype, sourcetype, &device_filter, &device_unique_name, NULL)) < 0)
return r;
ctx->device_filter[devtype] = device_filter;
ctx->device_unique_name[devtype] = device_unique_name;
if ((r = dshow_cycle_pins(avctx, devtype, sourcetype, device_filter, NULL)) < 0)
return r;
return 0;
}
static int
dshow_open_device(AVFormatContext *avctx, ICreateDevEnum *devenum,
enum dshowDeviceType devtype, enum dshowSourceFilterType sourcetype)
{
struct dshow_ctx *ctx = avctx->priv_data;
IBaseFilter *device_filter = NULL;
char *device_filter_unique_name = NULL;
IGraphBuilder *graph = ctx->graph;
IPin *device_pin = NULL;
DShowPin *capture_pin = NULL;
DShowFilter *capture_filter = NULL;
ICaptureGraphBuilder2 *graph_builder2 = NULL;
int ret = AVERROR(EIO);
int r;
IStream *ifile_stream = NULL;
IStream *ofile_stream = NULL;
IPersistStream *pers_stream = NULL;
enum dshowDeviceType otherDevType = (devtype == VideoDevice) ? AudioDevice : VideoDevice;
const wchar_t *filter_name[2] = { L"Audio capture filter", L"Video capture filter" };
if ( ((ctx->audio_filter_load_file) && (strlen(ctx->audio_filter_load_file)>0) && (sourcetype == AudioSourceDevice)) ||
((ctx->video_filter_load_file) && (strlen(ctx->video_filter_load_file)>0) && (sourcetype == VideoSourceDevice)) ) {
HRESULT hr;
char *filename = NULL;
if (sourcetype == AudioSourceDevice)
filename = ctx->audio_filter_load_file;
else
filename = ctx->video_filter_load_file;
hr = SHCreateStreamOnFile ((LPCSTR) filename, STGM_READ, &ifile_stream);
if (S_OK != hr) {
av_log(avctx, AV_LOG_ERROR, "Could not open capture filter description file.\n");
goto error;
}
hr = OleLoadFromStream(ifile_stream, &IID_IBaseFilter, (void **) &device_filter);
if (hr != S_OK) {
av_log(avctx, AV_LOG_ERROR, "Could not load capture filter from file.\n");
goto error;
}
if (sourcetype == AudioSourceDevice)
av_log(avctx, AV_LOG_INFO, "Audio-");
else
av_log(avctx, AV_LOG_INFO, "Video-");
av_log(avctx, AV_LOG_INFO, "Capture filter loaded successfully from file \"%s\".\n", filename);
} else {
if ((r = dshow_cycle_devices(avctx, devenum, devtype, sourcetype, &device_filter, &device_filter_unique_name, NULL)) < 0) {
ret = r;
goto error;
}
}
if (ctx->device_filter[otherDevType]) {
// avoid adding add two instances of the same device to the graph, one for video, one for audio
// a few devices don't support this (could also do this check earlier to avoid double crossbars, etc. but they seem OK)
if (strcmp(device_filter_unique_name, ctx->device_unique_name[otherDevType]) == 0) {
av_log(avctx, AV_LOG_DEBUG, "reusing previous graph capture filter... %s\n", device_filter_unique_name);
IBaseFilter_Release(device_filter);
device_filter = ctx->device_filter[otherDevType];
IBaseFilter_AddRef(ctx->device_filter[otherDevType]);
} else {
av_log(avctx, AV_LOG_DEBUG, "not reusing previous graph capture filter %s != %s\n", device_filter_unique_name, ctx->device_unique_name[otherDevType]);
}
}
ctx->device_filter [devtype] = device_filter;
ctx->device_unique_name [devtype] = device_filter_unique_name;
r = IGraphBuilder_AddFilter(graph, device_filter, NULL);
if (r != S_OK) {
av_log(avctx, AV_LOG_ERROR, "Could not add device filter to graph.\n");
goto error;
}
if ((r = dshow_cycle_pins(avctx, devtype, sourcetype, device_filter, &device_pin)) < 0) {
ret = r;
goto error;
}
ctx->device_pin[devtype] = device_pin;
capture_filter = ff_dshow_filter_Create(avctx, callback, devtype);
if (!capture_filter) {
av_log(avctx, AV_LOG_ERROR, "Could not create grabber filter.\n");
goto error;
}
ctx->capture_filter[devtype] = capture_filter;
if ( ((ctx->audio_filter_save_file) && (strlen(ctx->audio_filter_save_file)>0) && (sourcetype == AudioSourceDevice)) ||
((ctx->video_filter_save_file) && (strlen(ctx->video_filter_save_file)>0) && (sourcetype == VideoSourceDevice)) ) {
HRESULT hr;
char *filename = NULL;
if (sourcetype == AudioSourceDevice)
filename = ctx->audio_filter_save_file;
else
filename = ctx->video_filter_save_file;
hr = SHCreateStreamOnFile ((LPCSTR) filename, STGM_CREATE | STGM_READWRITE, &ofile_stream);
if (S_OK != hr) {
av_log(avctx, AV_LOG_ERROR, "Could not create capture filter description file.\n");
goto error;
}
hr = IBaseFilter_QueryInterface(device_filter, &IID_IPersistStream, (void **) &pers_stream);
if (hr != S_OK) {
av_log(avctx, AV_LOG_ERROR, "Query for IPersistStream failed.\n");
goto error;
}
hr = OleSaveToStream(pers_stream, ofile_stream);
if (hr != S_OK) {
av_log(avctx, AV_LOG_ERROR, "Could not save capture filter \n");
goto error;
}
hr = IStream_Commit(ofile_stream, STGC_DEFAULT);
if (S_OK != hr) {
av_log(avctx, AV_LOG_ERROR, "Could not commit capture filter data to file.\n");
goto error;
}
if (sourcetype == AudioSourceDevice)
av_log(avctx, AV_LOG_INFO, "Audio-");
else
av_log(avctx, AV_LOG_INFO, "Video-");
av_log(avctx, AV_LOG_INFO, "Capture filter saved successfully to file \"%s\".\n", filename);
}
r = IGraphBuilder_AddFilter(graph, (IBaseFilter *) capture_filter,
filter_name[devtype]);
if (r != S_OK) {
av_log(avctx, AV_LOG_ERROR, "Could not add capture filter to graph\n");
goto error;
}
ff_dshow_pin_AddRef(capture_filter->pin);
capture_pin = capture_filter->pin;
ctx->capture_pin[devtype] = capture_pin;
r = CoCreateInstance(&CLSID_CaptureGraphBuilder2, NULL, CLSCTX_INPROC_SERVER,
&IID_ICaptureGraphBuilder2, (void **) &graph_builder2);
if (r != S_OK) {
av_log(avctx, AV_LOG_ERROR, "Could not create CaptureGraphBuilder2\n");
goto error;
}
ICaptureGraphBuilder2_SetFiltergraph(graph_builder2, graph);
if (r != S_OK) {
av_log(avctx, AV_LOG_ERROR, "Could not set graph for CaptureGraphBuilder2\n");
goto error;
}
r = ICaptureGraphBuilder2_RenderStream(graph_builder2, NULL, NULL, (IUnknown *) device_pin, NULL /* no intermediate filter */,
(IBaseFilter *) capture_filter); /* connect pins, optionally insert intermediate filters like crossbar if necessary */
if (r != S_OK) {
av_log(avctx, AV_LOG_ERROR, "Could not RenderStream to connect pins\n");
goto error;
}
r = ff_dshow_try_setup_crossbar_options(graph_builder2, device_filter, devtype, avctx);
if (r != S_OK) {
av_log(avctx, AV_LOG_ERROR, "Could not setup CrossBar\n");
goto error;
}
ret = 0;
error:
if (graph_builder2 != NULL)
ICaptureGraphBuilder2_Release(graph_builder2);
if (pers_stream)
IPersistStream_Release(pers_stream);
if (ifile_stream)
IStream_Release(ifile_stream);
if (ofile_stream)
IStream_Release(ofile_stream);
return ret;
}
static enum AVCodecID waveform_codec_id(enum AVSampleFormat sample_fmt)
{
switch (sample_fmt) {
case AV_SAMPLE_FMT_U8: return AV_CODEC_ID_PCM_U8;
case AV_SAMPLE_FMT_S16: return AV_CODEC_ID_PCM_S16LE;
case AV_SAMPLE_FMT_S32: return AV_CODEC_ID_PCM_S32LE;
default: return AV_CODEC_ID_NONE; /* Should never happen. */
}
}
static enum AVSampleFormat sample_fmt_bits_per_sample(int bits)
{
switch (bits) {
case 8: return AV_SAMPLE_FMT_U8;
case 16: return AV_SAMPLE_FMT_S16;
case 32: return AV_SAMPLE_FMT_S32;
default: return AV_SAMPLE_FMT_NONE; /* Should never happen. */
}
}
static int
dshow_add_device(AVFormatContext *avctx,
enum dshowDeviceType devtype)
{
struct dshow_ctx *ctx = avctx->priv_data;
AM_MEDIA_TYPE type;
AVCodecParameters *par;
AVStream *st;
struct dshow_format_info *fmt_info = NULL;
int ret = AVERROR(EIO);
type.pbFormat = NULL;
st = avformat_new_stream(avctx, NULL);
if (!st) {
ret = AVERROR(ENOMEM);
goto error;
}
st->id = devtype;
ctx->capture_filter[devtype]->stream_index = st->index;
ff_dshow_pin_ConnectionMediaType(ctx->capture_pin[devtype], &type);
fmt_info = dshow_get_format_info(&type);
if (!fmt_info) {
ret = AVERROR(EIO);
goto error;
}
par = st->codecpar;
if (devtype == VideoDevice) {
BITMAPINFOHEADER *bih = NULL;
AVRational time_base;
if (IsEqualGUID(&type.formattype, &FORMAT_VideoInfo)) {
VIDEOINFOHEADER *v = (void *) type.pbFormat;
time_base = (AVRational) { v->AvgTimePerFrame, 10000000 };
bih = &v->bmiHeader;
} else if (IsEqualGUID(&type.formattype, &FORMAT_VideoInfo2)) {
VIDEOINFOHEADER2 *v = (void *) type.pbFormat;
time_base = (AVRational) { v->AvgTimePerFrame, 10000000 };
bih = &v->bmiHeader;
}
if (!bih) {
av_log(avctx, AV_LOG_ERROR, "Could not get media type.\n");
goto error;
}
st->avg_frame_rate = av_inv_q(time_base);
st->r_frame_rate = av_inv_q(time_base);
par->codec_type = AVMEDIA_TYPE_VIDEO;
par->width = fmt_info->width;
par->height = fmt_info->height;
par->codec_tag = bih->biCompression;
par->format = fmt_info->pix_fmt;
if (bih->biCompression == MKTAG('H', 'D', 'Y', 'C')) {
av_log(avctx, AV_LOG_DEBUG, "attempt to use full range for HDYC...\n");
par->color_range = AVCOL_RANGE_MPEG; // just in case it needs this...
}
par->color_range = fmt_info->col_range;
par->color_space = fmt_info->col_space;
par->color_primaries = fmt_info->col_prim;
par->color_trc = fmt_info->col_trc;
par->chroma_location = fmt_info->chroma_loc;
par->codec_id = fmt_info->codec_id;
if (par->codec_id == AV_CODEC_ID_RAWVIDEO) {
if (bih->biCompression == BI_RGB || bih->biCompression == BI_BITFIELDS) {
par->bits_per_coded_sample = bih->biBitCount;
if (par->height < 0) {
par->height *= -1;
} else {
par->extradata = av_malloc(9 + AV_INPUT_BUFFER_PADDING_SIZE);
if (par->extradata) {
par->extradata_size = 9;
memcpy(par->extradata, "BottomUp", 9);
}
}
}
} else {
if (par->codec_id == AV_CODEC_ID_NONE) {
av_log(avctx, AV_LOG_ERROR, "Unknown compression type. "
"Please report type 0x%X.\n", (int) bih->biCompression);
ret = AVERROR_PATCHWELCOME;
goto error;
}
par->bits_per_coded_sample = bih->biBitCount;
}
} else {
if (!IsEqualGUID(&type.formattype, &FORMAT_WaveFormatEx)) {
av_log(avctx, AV_LOG_ERROR, "Could not get media type.\n");
goto error;
}
par->codec_type = AVMEDIA_TYPE_AUDIO;
par->format = sample_fmt_bits_per_sample(fmt_info->sample_size);
par->codec_id = waveform_codec_id(par->format);
par->sample_rate = fmt_info->sample_rate;
par->channels = fmt_info->channels;
}
avpriv_set_pts_info(st, 64, 1, 10000000);
ret = 0;
error:
av_freep(&fmt_info);
if (type.pbFormat)
CoTaskMemFree(type.pbFormat);
return ret;
}
static int parse_device_name(AVFormatContext *avctx)
{
struct dshow_ctx *ctx = avctx->priv_data;
char **device_name = ctx->device_name;
char *name = av_strdup(avctx->url);
char *tmp = name;
int ret = 1;
char *type;
while ((type = strtok(tmp, "="))) {
char *token = strtok(NULL, ":");
tmp = NULL;
if (!strcmp(type, "video")) {
device_name[0] = token;
} else if (!strcmp(type, "audio")) {
device_name[1] = token;
} else {
device_name[0] = NULL;
device_name[1] = NULL;
break;
}
}
if (!device_name[0] && !device_name[1]) {
ret = 0;
} else {
if (device_name[0])
device_name[0] = av_strdup(device_name[0]);
if (device_name[1])
device_name[1] = av_strdup(device_name[1]);
}
av_free(name);
return ret;
}
static int dshow_read_header(AVFormatContext *avctx)
{
struct dshow_ctx *ctx = avctx->priv_data;
IGraphBuilder *graph = NULL;
ICreateDevEnum *devenum = NULL;
IMediaControl *control = NULL;
IMediaEvent *media_event = NULL;
HANDLE media_event_handle;
HANDLE proc;
int ret = AVERROR(EIO);
int r;
CoInitialize(0);
if (!ctx->list_devices && !parse_device_name(avctx)) {
av_log(avctx, AV_LOG_ERROR, "Malformed dshow input string.\n");
goto error;
}
ctx->video_codec_id = avctx->video_codec_id ? avctx->video_codec_id
: AV_CODEC_ID_RAWVIDEO;
if (ctx->pixel_format != AV_PIX_FMT_NONE) {
if (ctx->video_codec_id != AV_CODEC_ID_RAWVIDEO) {
av_log(avctx, AV_LOG_ERROR, "Pixel format may only be set when "
"video codec is not set or set to rawvideo\n");
ret = AVERROR(EINVAL);
goto error;
}
}
if (ctx->framerate) {
r = av_parse_video_rate(&ctx->requested_framerate, ctx->framerate);
if (r < 0) {
av_log(avctx, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", ctx->framerate);
goto error;
}
}
r = CoCreateInstance(&CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER,
&IID_IGraphBuilder, (void **) &graph);
if (r != S_OK) {
av_log(avctx, AV_LOG_ERROR, "Could not create capture graph.\n");
goto error;
}
ctx->graph = graph;
r = CoCreateInstance(&CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER,
&IID_ICreateDevEnum, (void **) &devenum);
if (r != S_OK) {
av_log(avctx, AV_LOG_ERROR, "Could not enumerate system devices.\n");
goto error;
}
if (ctx->list_devices) {
dshow_cycle_devices(avctx, devenum, VideoDevice, VideoSourceDevice, NULL, NULL, NULL);
dshow_cycle_devices(avctx, devenum, AudioDevice, AudioSourceDevice, NULL, NULL, NULL);
ret = AVERROR_EXIT;
goto error;
}
if (ctx->list_options) {
if (ctx->device_name[VideoDevice])
if ((r = dshow_list_device_options(avctx, devenum, VideoDevice, VideoSourceDevice))) {
ret = r;
goto error;
}
if (ctx->device_name[AudioDevice]) {
if (dshow_list_device_options(avctx, devenum, AudioDevice, AudioSourceDevice)) {
/* show audio options from combined video+audio sources as fallback */
if ((r = dshow_list_device_options(avctx, devenum, AudioDevice, VideoSourceDevice))) {
ret = r;
goto error;
}
}
}
// don't exit yet, allow it to list crossbar options in dshow_open_device
}
if (ctx->device_name[VideoDevice]) {
if ((r = dshow_open_device(avctx, devenum, VideoDevice, VideoSourceDevice)) < 0 ||
(r = dshow_add_device(avctx, VideoDevice)) < 0) {
ret = r;
goto error;
}
}
if (ctx->device_name[AudioDevice]) {
if ((r = dshow_open_device(avctx, devenum, AudioDevice, AudioSourceDevice)) < 0 ||
(r = dshow_add_device(avctx, AudioDevice)) < 0) {
av_log(avctx, AV_LOG_INFO, "Searching for audio device within video devices for %s\n", ctx->device_name[AudioDevice]);
/* see if there's a video source with an audio pin with the given audio name */
if ((r = dshow_open_device(avctx, devenum, AudioDevice, VideoSourceDevice)) < 0 ||
(r = dshow_add_device(avctx, AudioDevice)) < 0) {
ret = r;
goto error;
}
}
}
if (ctx->list_options) {
/* allow it to list crossbar options in dshow_open_device */
ret = AVERROR_EXIT;
goto error;
}
ctx->curbufsize[0] = 0;
ctx->curbufsize[1] = 0;
ctx->mutex = CreateMutex(NULL, 0, NULL);
if (!ctx->mutex) {
av_log(avctx, AV_LOG_ERROR, "Could not create Mutex\n");
goto error;
}
ctx->event[1] = CreateEvent(NULL, 1, 0, NULL);
if (!ctx->event[1]) {
av_log(avctx, AV_LOG_ERROR, "Could not create Event\n");
goto error;
}
r = IGraphBuilder_QueryInterface(graph, &IID_IMediaControl, (void **) &control);
if (r != S_OK) {
av_log(avctx, AV_LOG_ERROR, "Could not get media control.\n");
goto error;
}
ctx->control = control;
r = IGraphBuilder_QueryInterface(graph, &IID_IMediaEvent, (void **) &media_event);
if (r != S_OK) {
av_log(avctx, AV_LOG_ERROR, "Could not get media event.\n");
goto error;
}
ctx->media_event = media_event;
r = IMediaEvent_GetEventHandle(media_event, (void *) &media_event_handle);
if (r != S_OK) {
av_log(avctx, AV_LOG_ERROR, "Could not get media event handle.\n");
goto error;
}
proc = GetCurrentProcess();
r = DuplicateHandle(proc, media_event_handle, proc, &ctx->event[0],
0, 0, DUPLICATE_SAME_ACCESS);
if (!r) {
av_log(avctx, AV_LOG_ERROR, "Could not duplicate media event handle.\n");
goto error;
}
r = IMediaControl_Run(control);
if (r == S_FALSE) {
OAFilterState pfs;
r = IMediaControl_GetState(control, 0, &pfs);
}
if (r != S_OK) {
av_log(avctx, AV_LOG_ERROR, "Could not run graph (sometimes caused by a device already in use by other application)\n");
goto error;
}
ret = 0;
error:
if (devenum)
ICreateDevEnum_Release(devenum);
if (ret < 0)
dshow_read_close(avctx);
return ret;
}
/**
* Checks media events from DirectShow and returns -1 on error or EOF. Also
* purges all events that might be in the event queue to stop the trigger
* of event notification.
*/
static int dshow_check_event_queue(IMediaEvent *media_event)
{
LONG_PTR p1, p2;
long code;
int ret = 0;
while (IMediaEvent_GetEvent(media_event, &code, &p1, &p2, 0) != E_ABORT) {
if (code == EC_COMPLETE || code == EC_DEVICE_LOST || code == EC_ERRORABORT)
ret = -1;
IMediaEvent_FreeEventParams(media_event, code, p1, p2);
}
return ret;
}
static int dshow_read_packet(AVFormatContext *s, AVPacket *pkt)
{
struct dshow_ctx *ctx = s->priv_data;
PacketList *pktl = NULL;
while (!ctx->eof && !pktl) {
WaitForSingleObject(ctx->mutex, INFINITE);
pktl = ctx->pktl;
if (pktl) {
*pkt = pktl->pkt;
ctx->pktl = ctx->pktl->next;
av_free(pktl);
ctx->curbufsize[pkt->stream_index] -= pkt->size;
}
ResetEvent(ctx->event[1]);
ReleaseMutex(ctx->mutex);
if (!pktl) {
if (dshow_check_event_queue(ctx->media_event) < 0) {
ctx->eof = 1;
} else if (s->flags & AVFMT_FLAG_NONBLOCK) {
return AVERROR(EAGAIN);
} else {
WaitForMultipleObjects(2, ctx->event, 0, INFINITE);
}
}
}
return ctx->eof ? AVERROR(EIO) : pkt->size;
}
#define OFFSET(x) offsetof(struct dshow_ctx, x)
#define DEC AV_OPT_FLAG_DECODING_PARAM
static const AVOption options[] = {
{ "video_size", "set video size given a string such as 640x480 or hd720.", OFFSET(requested_width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
{ "pixel_format", "set video pixel format", OFFSET(pixel_format), AV_OPT_TYPE_PIXEL_FMT, {.i64 = AV_PIX_FMT_NONE}, -1, INT_MAX, DEC },
{ "framerate", "set video frame rate", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
{ "sample_rate", "set audio sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, DEC },
{ "sample_size", "set audio sample size", OFFSET(sample_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 16, DEC },
{ "channels", "set number of audio channels, such as 1 or 2", OFFSET(channels), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, DEC },
{ "audio_buffer_size", "set audio device buffer latency size in milliseconds (default is the device's default)", OFFSET(audio_buffer_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, DEC },
{ "list_devices", "list available devices", OFFSET(list_devices), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, DEC },
{ "list_options", "list available options for specified device", OFFSET(list_options), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, DEC },
{ "video_device_number", "set video device number for devices with same name (starts at 0)", OFFSET(video_device_number), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, DEC },
{ "audio_device_number", "set audio device number for devices with same name (starts at 0)", OFFSET(audio_device_number), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, DEC },
{ "video_pin_name", "select video capture pin by name", OFFSET(video_pin_name),AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
{ "audio_pin_name", "select audio capture pin by name", OFFSET(audio_pin_name),AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
{ "crossbar_video_input_pin_number", "set video input pin number for crossbar device", OFFSET(crossbar_video_input_pin_number), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, DEC },
{ "crossbar_audio_input_pin_number", "set audio input pin number for crossbar device", OFFSET(crossbar_audio_input_pin_number), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, DEC },
{ "show_video_device_dialog", "display property dialog for video capture device", OFFSET(show_video_device_dialog), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
{ "show_audio_device_dialog", "display property dialog for audio capture device", OFFSET(show_audio_device_dialog), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
{ "show_video_crossbar_connection_dialog", "display property dialog for crossbar connecting pins filter on video device", OFFSET(show_video_crossbar_connection_dialog), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
{ "show_audio_crossbar_connection_dialog", "display property dialog for crossbar connecting pins filter on audio device", OFFSET(show_audio_crossbar_connection_dialog), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
{ "show_analog_tv_tuner_dialog", "display property dialog for analog tuner filter", OFFSET(show_analog_tv_tuner_dialog), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
{ "show_analog_tv_tuner_audio_dialog", "display property dialog for analog tuner audio filter", OFFSET(show_analog_tv_tuner_audio_dialog), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
{ "audio_device_load", "load audio capture filter device (and properties) from file", OFFSET(audio_filter_load_file), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
{ "audio_device_save", "save audio capture filter device (and properties) to file", OFFSET(audio_filter_save_file), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
{ "video_device_load", "load video capture filter device (and properties) from file", OFFSET(video_filter_load_file), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
{ "video_device_save", "save video capture filter device (and properties) to file", OFFSET(video_filter_save_file), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
{ "use_video_device_timestamps", "use device instead of wallclock timestamps for video frames", OFFSET(use_video_device_timestamps), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, DEC },
{ NULL },
};
static const AVClass dshow_class = {
.class_name = "dshow indev",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
.category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
};
const AVInputFormat ff_dshow_demuxer = {
.name = "dshow",
.long_name = NULL_IF_CONFIG_SMALL("DirectShow capture"),
.priv_data_size = sizeof(struct dshow_ctx),
.read_header = dshow_read_header,
.read_packet = dshow_read_packet,
.read_close = dshow_read_close,
.get_device_list= dshow_get_device_list,
.flags = AVFMT_NOFILE | AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK,
.priv_class = &dshow_class,
};
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