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dshow: factorise cycling through pins 

Signed-off-by: Stefano Sabatini <stefasab@gmail.com>
This commit is contained in:
Ramiro Polla 2011-09-09 00:10:07 -03:00 committed by Stefano Sabatini
parent 41215fdeb3
commit ee4ed80485
1 changed files with 47 additions and 26 deletions
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73
libavdevice/dshow.c
View File

@ -295,42 +295,27 @@ fail1:
return 0;
}
/**
* 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.
*/
static int
dshow_open_device(AVFormatContext *avctx, ICreateDevEnum *devenum,
enum dshowDeviceType devtype)
dshow_cycle_pins(AVFormatContext *avctx, enum dshowDeviceType devtype,
IBaseFilter *device_filter, IPin **ppin)
{
struct dshow_ctx *ctx = avctx->priv_data;
IBaseFilter *device_filter = NULL;
IGraphBuilder *graph = ctx->graph;
IEnumPins *pins = 0;
IPin *device_pin = NULL;
libAVPin *capture_pin = NULL;
libAVFilter *capture_filter = NULL;
int ret = AVERROR(EIO);
IPin *pin;
int r;
const GUID *mediatype[2] = { &MEDIATYPE_Video, &MEDIATYPE_Audio };
const char *devtypename = (devtype == VideoDevice) ? "video" : "audio";
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;
}
r = IBaseFilter_EnumPins(device_filter, &pins);
if (r != S_OK) {
av_log(avctx, AV_LOG_ERROR, "Could not enumerate pins.\n");
goto error;
return AVERROR(EIO);
}
while (IEnumPins_Next(pins, 1, &pin, NULL) == S_OK && !device_pin) {
@ -375,9 +360,48 @@ next:
IPin_Release(pin);
}
IEnumPins_Release(pins);
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;
}
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;
@ -409,9 +433,6 @@ next:
ret = 0;
error:
if (pins)
IEnumPins_Release(pins);
return ret;
}