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dshow: factorise cycling through devices

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Signed-off-by: Stefano Sabatini <stefano.sabatini-lala@poste.it>
This commit is contained in:
Ramiro Polla
2011-09-09 00:08:43 -03:00
committed by Stefano Sabatini
parent 4381bddc9f
commit fad4e1a572
1 changed files with 39 additions and 14 deletions
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53
libavdevice/dshow.c
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@@ -213,36 +213,32 @@ fail:
return; 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.
*/
static int static int
dshow_open_device(AVFormatContext *avctx, ICreateDevEnum *devenum, dshow_cycle_devices(AVFormatContext *avctx, ICreateDevEnum *devenum,
enum dshowDeviceType devtype) enum dshowDeviceType devtype, IBaseFilter **pfilter)
{ {
struct dshow_ctx *ctx = avctx->priv_data; struct dshow_ctx *ctx = avctx->priv_data;
IBaseFilter *device_filter = NULL; IBaseFilter *device_filter = NULL;
IEnumMoniker *classenum = NULL; IEnumMoniker *classenum = NULL;
IGraphBuilder *graph = ctx->graph;
IEnumPins *pins = 0;
IMoniker *m = NULL; IMoniker *m = NULL;
IPin *device_pin = NULL;
libAVPin *capture_pin = NULL;
libAVFilter *capture_filter = NULL;
const char *device_name = ctx->device_name[devtype]; const char *device_name = ctx->device_name[devtype];
int ret = AVERROR(EIO);
IPin *pin;
int r; int r;
const GUID *device_guid[2] = { &CLSID_VideoInputDeviceCategory, const GUID *device_guid[2] = { &CLSID_VideoInputDeviceCategory,
&CLSID_AudioInputDeviceCategory }; &CLSID_AudioInputDeviceCategory };
const GUID *mediatype[2] = { &MEDIATYPE_Video, &MEDIATYPE_Audio };
const char *devtypename = (devtype == VideoDevice) ? "video" : "audio"; const char *devtypename = (devtype == VideoDevice) ? "video" : "audio";
const wchar_t *filter_name[2] = { L"Audio capture filter", L"Video capture filter" };
r = ICreateDevEnum_CreateClassEnumerator(devenum, device_guid[devtype], r = ICreateDevEnum_CreateClassEnumerator(devenum, device_guid[devtype],
(IEnumMoniker **) &classenum, 0); (IEnumMoniker **) &classenum, 0);
if (r != S_OK) { if (r != S_OK) {
av_log(avctx, AV_LOG_ERROR, "Could not enumerate %s devices.\n", av_log(avctx, AV_LOG_ERROR, "Could not enumerate %s devices.\n",
devtypename); devtypename);
goto error; return AVERROR(EIO);
} }
while (IEnumMoniker_Next(classenum, 1, &m, NULL) == S_OK && !device_filter) { while (IEnumMoniker_Next(classenum, 1, &m, NULL) == S_OK && !device_filter) {
@@ -274,11 +270,42 @@ fail1:
IMoniker_Release(m); IMoniker_Release(m);
} }
IEnumMoniker_Release(classenum);
if (!device_filter) { if (!device_filter) {
av_log(avctx, AV_LOG_ERROR, "Could not find %s device.\n", av_log(avctx, AV_LOG_ERROR, "Could not find %s device.\n",
devtypename); devtypename);
return AVERROR(EIO);
}
*pfilter = device_filter;
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;
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; goto error;
} }
ctx->device_filter [devtype] = device_filter; ctx->device_filter [devtype] = device_filter;
r = IGraphBuilder_AddFilter(graph, device_filter, NULL); r = IGraphBuilder_AddFilter(graph, device_filter, NULL);
@@ -371,8 +398,6 @@ next:
error: error:
if (pins) if (pins)
IEnumPins_Release(pins); IEnumPins_Release(pins);
if (classenum)
IEnumMoniker_Release(classenum);
return ret; return ret;
} }