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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 "libavutil/parseutils.h"
#include "libavutil/opt.h"
#include "avdevice.h"
#include "dshow.h"
struct dshow_ctx {
const AVClass *class;
IGraphBuilder *graph;
char *device_name[2];
int video_device_number;
int audio_device_number;
int list_options;
int list_devices;
IBaseFilter *device_filter[2];
IPin *device_pin[2];
libAVFilter *capture_filter[2];
libAVPin *capture_pin[2];
HANDLE mutex;
HANDLE event;
AVPacketList *pktl;
unsigned int curbufsize;
unsigned int video_frame_num;
IMediaControl *control;
char *video_size;
char *framerate;
int requested_width;
int requested_height;
AVRational requested_framerate;
int sample_rate;
int sample_size;
int channels;
};
static enum PixelFormat dshow_pixfmt(DWORD biCompression, WORD biBitCount)
{
switch(biCompression) {
case MKTAG('U', 'Y', 'V', 'Y'):
return PIX_FMT_UYVY422;
case MKTAG('Y', 'U', 'Y', '2'):
return PIX_FMT_YUYV422;
case MKTAG('I', '4', '2', '0'):
return PIX_FMT_YUV420P;
case BI_BITFIELDS:
case BI_RGB:
switch(biBitCount) { /* 1-8 are untested */
case 1:
return PIX_FMT_MONOWHITE;
case 4:
return PIX_FMT_RGB4;
case 8:
return PIX_FMT_RGB8;
case 16:
return PIX_FMT_RGB555;
case 24:
return PIX_FMT_BGR24;
case 32:
return PIX_FMT_RGB32;
}
}
return PIX_FMT_NONE;
}
static enum CodecID dshow_codecid(DWORD biCompression)
{
switch(biCompression) {
case MKTAG('d', 'v', 's', 'd'):
return CODEC_ID_DVVIDEO;
case MKTAG('M', 'J', 'P', 'G'):
case MKTAG('m', 'j', 'p', 'g'):
return CODEC_ID_MJPEG;
}
return CODEC_ID_NONE;
}
static int
dshow_read_close(AVFormatContext *s)
{
struct dshow_ctx *ctx = s->priv_data;
AVPacketList *pktl;
if (ctx->control) {
IMediaControl_Stop(ctx->control);
IMediaControl_Release(ctx->control);
}
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])
libAVPin_Release(ctx->capture_pin[VideoDevice]);
if (ctx->capture_pin[AudioDevice])
libAVPin_Release(ctx->capture_pin[AudioDevice]);
if (ctx->capture_filter[VideoDevice])
libAVFilter_Release(ctx->capture_filter[VideoDevice]);
if (ctx->capture_filter[AudioDevice])
libAVFilter_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]);
if (ctx->device_name[0])
av_free(ctx->device_name[0]);
if (ctx->device_name[1])
av_free(ctx->device_name[1]);
if(ctx->mutex)
CloseHandle(ctx->mutex);
if(ctx->event)
CloseHandle(ctx->event);
pktl = ctx->pktl;
while (pktl) {
AVPacketList *next = pktl->next;
av_destruct_packet(&pktl->pkt);
av_free(pktl);
pktl = next;
}
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)
{
struct dshow_ctx *ctx = s->priv_data;
const uint8_t dropscore[] = {62, 75, 87, 100};
const int ndropscores = FF_ARRAY_ELEMS(dropscore);
unsigned int buffer_fullness = (ctx->curbufsize*100)/s->max_picture_buffer;
if(dropscore[++ctx->video_frame_num%ndropscores] <= buffer_fullness) {
av_log(s, AV_LOG_ERROR,
"real-time buffer %d%% full! frame dropped!\n", buffer_fullness);
return 1;
}
return 0;
}
static void
callback(void *priv_data, int index, uint8_t *buf, int buf_size, int64_t time)
{
AVFormatContext *s = priv_data;
struct dshow_ctx *ctx = s->priv_data;
AVPacketList **ppktl, *pktl_next;
// dump_videohdr(s, vdhdr);
if(shall_we_drop(s))
return;
WaitForSingleObject(ctx->mutex, INFINITE);
pktl_next = av_mallocz(sizeof(AVPacketList));
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 += buf_size;
SetEvent(ctx->event);
ReleaseMutex(ctx->mutex);
return;
fail:
ReleaseMutex(ctx->mutex);
return;
}
/**
* 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.
*/
static int
dshow_cycle_devices(AVFormatContext *avctx, ICreateDevEnum *devenum,
enum dshowDeviceType devtype, IBaseFilter **pfilter)
{
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";
r = ICreateDevEnum_CreateClassEnumerator(devenum, device_guid[devtype],
(IEnumMoniker **) &classenum, 0);
if (r != S_OK) {
av_log(avctx, AV_LOG_ERROR, "Could not enumerate %s devices.\n",
devtypename);
return AVERROR(EIO);
}
while (!device_filter && IEnumMoniker_Next(classenum, 1, &m, NULL) == S_OK) {
IPropertyBag *bag = NULL;
char *buf = NULL;
VARIANT var;
r = IMoniker_BindToStorage(m, 0, 0, &IID_IPropertyBag, (void *) &bag);
if (r != S_OK)
goto fail1;
var.vt = VT_BSTR;
r = IPropertyBag_Read(bag, L"FriendlyName", &var, NULL);
if (r != S_OK)
goto fail1;
buf = dup_wchar_to_utf8(var.bstrVal);
if (pfilter) {
if (strcmp(device_name, buf))
goto fail1;
if (!skip--)
IMoniker_BindToObject(m, 0, 0, &IID_IBaseFilter, (void *) &device_filter);
} else {
av_log(avctx, AV_LOG_INFO, " \"%s\"\n", buf);
}
fail1:
if (buf)
av_free(buf);
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.\n",
devtypename);
return AVERROR(EIO);
}
*pfilter = device_filter;
}
return 0;
}
/**
* Cycle through available formats using the specified pin,
* try to set parameters specified through AVOptions and 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;
int format_set = 0;
void *caps = NULL;
int i, n, size;
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;
for (i = 0; i < n && !format_set; i++) {
IAMStreamConfig_GetStreamCaps(config, i, &type, (void *) caps);
#if DSHOWDEBUG
ff_print_AM_MEDIA_TYPE(type);
#endif
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 (IsEqualGUID(&type->formattype, &FORMAT_VideoInfo)) {
VIDEOINFOHEADER *v = (void *) type->pbFormat;
fr = &v->AvgTimePerFrame;
bih = &v->bmiHeader;
} else if (IsEqualGUID(&type->formattype, &FORMAT_VideoInfo2)) {
VIDEOINFOHEADER2 *v = (void *) type->pbFormat;
fr = &v->AvgTimePerFrame;
bih = &v->bmiHeader;
} else {
goto next;
}
if (!pformat_set) {
av_log(avctx, AV_LOG_INFO, " min s=%ldx%ld fps=%g max s=%ldx%ld fps=%g\n",
vcaps->MinOutputSize.cx, vcaps->MinOutputSize.cy,
1e7 / vcaps->MaxFrameInterval,
vcaps->MaxOutputSize.cx, vcaps->MaxOutputSize.cy,
1e7 / vcaps->MinFrameInterval);
continue;
}
if (ctx->framerate) {
int64_t framerate = ((int64_t) ctx->requested_framerate.den*10000000)
/ ctx->requested_framerate.num;
if (framerate > vcaps->MaxFrameInterval ||
framerate < vcaps->MinFrameInterval)
goto next;
*fr = framerate;
}
if (ctx->video_size) {
if (ctx->requested_width > vcaps->MaxOutputSize.cx ||
ctx->requested_width < vcaps->MinOutputSize.cx ||
ctx->requested_height > vcaps->MaxOutputSize.cy ||
ctx->requested_height < vcaps->MinOutputSize.cy)
goto next;
bih->biWidth = ctx->requested_width;
bih->biHeight = ctx->requested_height;
}
} else {
AUDIO_STREAM_CONFIG_CAPS *acaps = caps;
WAVEFORMATEX *fx;
#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, " min ch=%lu bits=%lu rate=%6lu max ch=%lu bits=%lu rate=%6lu\n",
acaps->MinimumChannels, acaps->MinimumBitsPerSample, acaps->MinimumSampleFrequency,
acaps->MaximumChannels, acaps->MaximumBitsPerSample, acaps->MaximumSampleFrequency);
continue;
}
if (ctx->sample_rate) {
if (ctx->sample_rate > acaps->MaximumSampleFrequency ||
ctx->sample_rate < acaps->MinimumSampleFrequency)
goto next;
fx->nSamplesPerSec = ctx->sample_rate;
}
if (ctx->sample_size) {
if (ctx->sample_size > acaps->MaximumBitsPerSample ||
ctx->sample_size < acaps->MinimumBitsPerSample)
goto next;
fx->wBitsPerSample = ctx->sample_size;
}
if (ctx->channels) {
if (ctx->channels > acaps->MaximumChannels ||
ctx->channels < acaps->MinimumChannels)
goto next;
fx->nChannels = ctx->channels;
}
}
if (IAMStreamConfig_SetFormat(config, type) != S_OK)
goto next;
format_set = 1;
next:
if (type->pbFormat)
CoTaskMemFree(type->pbFormat);
CoTaskMemFree(type);
}
end:
IAMStreamConfig_Release(config);
if (caps)
av_free(caps);
if (pformat_set)
*pformat_set = format_set;
}
/**
* 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,
IBaseFilter *device_filter, IPin **ppin)
{
struct dshow_ctx *ctx = avctx->priv_data;
IEnumPins *pins = 0;
IPin *device_pin = NULL;
IPin *pin;
int r;
const GUID *mediatype[2] = { &MEDIATYPE_Video, &MEDIATYPE_Audio };
const char *devtypename = (devtype == VideoDevice) ? "video" : "audio";
int set_format = (devtype == VideoDevice && (ctx->video_size || ctx->framerate))
|| (devtype == AudioDevice && (ctx->channels || ctx->sample_rate));
int format_set = 0;
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\n",
devtypename);
}
while (!device_pin && IEnumPins_Next(pins, 1, &pin, NULL) == S_OK) {
IKsPropertySet *p = NULL;
IEnumMediaTypes *types = NULL;
PIN_INFO info = {0};
AM_MEDIA_TYPE *type;
GUID category;
DWORD r2;
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;
if (!ppin) {
char *buf = dup_wchar_to_utf8(info.achName);
av_log(avctx, AV_LOG_INFO, " Pin \"%s\"\n", buf);
av_free(buf);
dshow_cycle_formats(avctx, devtype, pin, NULL);
goto next;
}
if (set_format) {
dshow_cycle_formats(avctx, devtype, pin, &format_set);
if (!format_set) {
goto next;
}
}
if (IPin_EnumMediaTypes(pin, &types) != S_OK)
goto next;
IEnumMediaTypes_Reset(types);
while (!device_pin && IEnumMediaTypes_Next(types, 1, &type, NULL) == S_OK) {
if (IsEqualGUID(&type->majortype, mediatype[devtype])) {
device_pin = pin;
goto next;
}
CoTaskMemFree(type);
}
next:
if (types)
IEnumMediaTypes_Release(types);
if (p)
IKsPropertySet_Release(p);
if (device_pin != pin)
IPin_Release(pin);
}
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.
*
* @param devenum device enumerator used for accessing the device
*/
static int
dshow_list_device_options(AVFormatContext *avctx, ICreateDevEnum *devenum,
enum dshowDeviceType devtype)
{
struct dshow_ctx *ctx = avctx->priv_data;
IBaseFilter *device_filter = NULL;
int r;
if ((r = dshow_cycle_devices(avctx, devenum, devtype, &device_filter)) < 0)
return r;
ctx->device_filter[devtype] = device_filter;
if ((r = dshow_cycle_pins(avctx, devtype, device_filter, NULL)) < 0)
return r;
return 0;
}
static int
dshow_open_device(AVFormatContext *avctx, ICreateDevEnum *devenum,
enum dshowDeviceType devtype)
{
struct dshow_ctx *ctx = avctx->priv_data;
IBaseFilter *device_filter = NULL;
IGraphBuilder *graph = ctx->graph;
IPin *device_pin = NULL;
libAVPin *capture_pin = NULL;
libAVFilter *capture_filter = NULL;
int ret = AVERROR(EIO);
int r;
const wchar_t *filter_name[2] = { L"Audio capture filter", L"Video capture filter" };
if ((r = dshow_cycle_devices(avctx, devenum, devtype, &device_filter)) < 0) {
ret = r;
goto error;
}
ctx->device_filter [devtype] = device_filter;
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, device_filter, &device_pin)) < 0) {
ret = r;
goto error;
}
ctx->device_pin[devtype] = device_pin;
capture_filter = libAVFilter_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;
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;
}
libAVPin_AddRef(capture_filter->pin);
capture_pin = capture_filter->pin;
ctx->capture_pin[devtype] = capture_pin;
r = IGraphBuilder_ConnectDirect(graph, device_pin, (IPin *) capture_pin, NULL);
if (r != S_OK) {
av_log(avctx, AV_LOG_ERROR, "Could not connect pins\n");
goto error;
}
ret = 0;
error:
return ret;
}
static enum CodecID waveform_codec_id(enum AVSampleFormat sample_fmt)
{
switch (sample_fmt) {
case AV_SAMPLE_FMT_U8: return CODEC_ID_PCM_U8;
case AV_SAMPLE_FMT_S16: return CODEC_ID_PCM_S16LE;
case AV_SAMPLE_FMT_S32: return CODEC_ID_PCM_S32LE;
default: return CODEC_ID_NONE; /* Should never happen. */
}
}
static enum SampleFormat 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, AVFormatParameters *ap,
enum dshowDeviceType devtype)
{
struct dshow_ctx *ctx = avctx->priv_data;
AM_MEDIA_TYPE type;
AVCodecContext *codec;
AVStream *st;
int ret = AVERROR(EIO);
st = avformat_new_stream(avctx, NULL);
if (!st) {
ret = AVERROR(ENOMEM);
goto error;
}
st->id = devtype;
ctx->capture_filter[devtype]->stream_index = st->index;
libAVPin_ConnectionMediaType(ctx->capture_pin[devtype], &type);
codec = st->codec;
if (devtype == VideoDevice) {
BITMAPINFOHEADER *bih = NULL;
if (IsEqualGUID(&type.formattype, &FORMAT_VideoInfo)) {
VIDEOINFOHEADER *v = (void *) type.pbFormat;
bih = &v->bmiHeader;
} else if (IsEqualGUID(&type.formattype, &FORMAT_VideoInfo2)) {
VIDEOINFOHEADER2 *v = (void *) type.pbFormat;
bih = &v->bmiHeader;
}
if (!bih) {
av_log(avctx, AV_LOG_ERROR, "Could not get media type.\n");
goto error;
}
codec->time_base = ap->time_base;
codec->codec_type = AVMEDIA_TYPE_VIDEO;
codec->width = bih->biWidth;
codec->height = bih->biHeight;
codec->pix_fmt = dshow_pixfmt(bih->biCompression, bih->biBitCount);
if (codec->pix_fmt == PIX_FMT_NONE) {
codec->codec_id = dshow_codecid(bih->biCompression);
if (codec->codec_id == CODEC_ID_NONE) {
av_log(avctx, AV_LOG_ERROR, "Unknown compression type. "
"Please report verbose (-v 9) debug information.\n");
dshow_read_close(avctx);
return AVERROR_PATCHWELCOME;
}
codec->bits_per_coded_sample = bih->biBitCount;
} else {
codec->codec_id = CODEC_ID_RAWVIDEO;
if (bih->biCompression == BI_RGB || bih->biCompression == BI_BITFIELDS) {
codec->bits_per_coded_sample = bih->biBitCount;
codec->extradata = av_malloc(9 + FF_INPUT_BUFFER_PADDING_SIZE);
if (codec->extradata) {
codec->extradata_size = 9;
memcpy(codec->extradata, "BottomUp", 9);
}
}
}
} else {
WAVEFORMATEX *fx = NULL;
if (IsEqualGUID(&type.formattype, &FORMAT_WaveFormatEx)) {
fx = (void *) type.pbFormat;
}
if (!fx) {
av_log(avctx, AV_LOG_ERROR, "Could not get media type.\n");
goto error;
}
codec->codec_type = AVMEDIA_TYPE_AUDIO;
codec->sample_fmt = sample_fmt_bits_per_sample(fx->wBitsPerSample);
codec->codec_id = waveform_codec_id(codec->sample_fmt);
codec->sample_rate = fx->nSamplesPerSec;
codec->channels = fx->nChannels;
}
av_set_pts_info(st, 64, 1, 10000000);
ret = 0;
error:
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->filename);
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, AVFormatParameters *ap)
{
struct dshow_ctx *ctx = avctx->priv_data;
IGraphBuilder *graph = NULL;
ICreateDevEnum *devenum = NULL;
IMediaControl *control = NULL;
int ret = AVERROR(EIO);
int r;
if (!ctx->list_devices && !parse_device_name(avctx)) {
av_log(avctx, AV_LOG_ERROR, "Malformed dshow input string.\n");
goto error;
}
if (ctx->video_size) {
r = av_parse_video_size(&ctx->requested_width, &ctx->requested_height, ctx->video_size);
if (r < 0) {
av_log(avctx, AV_LOG_ERROR, "Could not parse video size '%s'.\n", ctx->video_size);
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;
}
}
CoInitialize(0);
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) {
av_log(avctx, AV_LOG_INFO, "DirectShow video devices\n");
dshow_cycle_devices(avctx, devenum, VideoDevice, NULL);
av_log(avctx, AV_LOG_INFO, "DirectShow audio devices\n");
dshow_cycle_devices(avctx, devenum, AudioDevice, NULL);
ret = AVERROR_EXIT;
goto error;
}
if (ctx->list_options) {
if (ctx->device_name[VideoDevice])
dshow_list_device_options(avctx, devenum, VideoDevice);
if (ctx->device_name[AudioDevice])
dshow_list_device_options(avctx, devenum, AudioDevice);
ret = AVERROR_EXIT;
goto error;
}
if (ctx->device_name[VideoDevice]) {
ret = dshow_open_device(avctx, devenum, VideoDevice);
if (ret < 0)
goto error;
ret = dshow_add_device(avctx, ap, VideoDevice);
if (ret < 0)
goto error;
}
if (ctx->device_name[AudioDevice]) {
ret = dshow_open_device(avctx, devenum, AudioDevice);
if (ret < 0)
goto error;
ret = dshow_add_device(avctx, ap, AudioDevice);
if (ret < 0)
goto error;
}
ctx->mutex = CreateMutex(NULL, 0, NULL);
if (!ctx->mutex) {
av_log(avctx, AV_LOG_ERROR, "Could not create Mutex\n");
goto error;
}
ctx->event = CreateEvent(NULL, 1, 0, NULL);
if (!ctx->event) {
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 = 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 filter\n");
goto error;
}
ret = 0;
error:
if (ret < 0)
dshow_read_close(avctx);
if (devenum)
ICreateDevEnum_Release(devenum);
return ret;
}
static int dshow_read_packet(AVFormatContext *s, AVPacket *pkt)
{
struct dshow_ctx *ctx = s->priv_data;
AVPacketList *pktl = NULL;
while (!pktl) {
WaitForSingleObject(ctx->mutex, INFINITE);
pktl = ctx->pktl;
if (ctx->pktl) {
*pkt = ctx->pktl->pkt;
ctx->pktl = ctx->pktl->next;
av_free(pktl);
}
ResetEvent(ctx->event);
ReleaseMutex(ctx->mutex);
if (!pktl) {
if (s->flags & AVFMT_FLAG_NONBLOCK) {
return AVERROR(EAGAIN);
} else {
WaitForSingleObject(ctx->event, INFINITE);
}
}
}
ctx->curbufsize -= pkt->size;
return 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(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, 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, {.dbl = 0}, 0, INT_MAX, DEC },
{ "sample_size", "set audio sample size", OFFSET(sample_size), AV_OPT_TYPE_INT, {.dbl = 0}, 0, 16, DEC },
{ "channels", "set number of audio channels, such as 1 or 2", OFFSET(channels), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, DEC },
{ "list_devices", "list available devices", OFFSET(list_devices), AV_OPT_TYPE_INT, {.dbl=0}, 0, 1, DEC, "list_devices" },
{ "true", "", 0, AV_OPT_TYPE_CONST, {.dbl=1}, 0, 0, DEC, "list_devices" },
{ "false", "", 0, AV_OPT_TYPE_CONST, {.dbl=0}, 0, 0, DEC, "list_devices" },
{ "list_options", "list available options for specified device", OFFSET(list_options), AV_OPT_TYPE_INT, {.dbl=0}, 0, 1, DEC, "list_options" },
{ "true", "", 0, AV_OPT_TYPE_CONST, {.dbl=1}, 0, 0, DEC, "list_options" },
{ "false", "", 0, AV_OPT_TYPE_CONST, {.dbl=0}, 0, 0, DEC, "list_options" },
{ "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 },
{ "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 },
{ NULL },
};
static const AVClass dshow_class = {
.class_name = "DirectShow indev",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVInputFormat ff_dshow_demuxer = {
"dshow",
NULL_IF_CONFIG_SMALL("DirectShow capture"),
sizeof(struct dshow_ctx),
NULL,
dshow_read_header,
dshow_read_packet,
dshow_read_close,
.flags = AVFMT_NOFILE,
.priv_class = &dshow_class,
};