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dshowaudiosrc: fix audiocapture producing silence

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Configure the capture latency using the IAMBufferNegotiation
interface and try to respect the configured latency-time and buffer-time
This commit is contained in:
Andoni Morales Alastruey 2013-06-11 11:54:41 +02:00
parent d50625eeb0
commit c450a15f9f
3 changed files with 35 additions and 3 deletions
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18
sys/dshowsrcwrapper/gstdshow.cpp
View file

@ -496,3 +496,21 @@ gst_dshow_new_video_caps (GstVideoFormat video_format, const gchar * name,
return video_caps;
}
bool gst_dshow_configure_latency (IPin *pCapturePin, guint bufSizeMS)
{
HRESULT hr;
ALLOCATOR_PROPERTIES alloc_prop;
IAMBufferNegotiation * pNeg = NULL;
hr = pCapturePin->QueryInterface(IID_IAMBufferNegotiation, (void **)&pNeg);
if(!SUCCEEDED (hr))
return FALSE;
alloc_prop.cbAlign = -1; // -1 means no preference.
alloc_prop.cbBuffer = bufSizeMS;
alloc_prop.cbPrefix = -1;
alloc_prop.cBuffers = -1;
hr = pNeg->SuggestAllocatorProperties (&alloc_prop);
return SUCCEEDED (hr);
}

3
sys/dshowsrcwrapper/gstdshow.h
View file

@ -96,4 +96,7 @@ GstVideoFormat gst_dshow_guid_to_gst_video_format (AM_MEDIA_TYPE *mediatype);
GstCaps *gst_dshow_new_video_caps (GstVideoFormat video_format,
const gchar * name, GstCapturePinMediaType * pin_mediatype);
/* configure the latency of the capture source */
bool gst_dshow_configure_latency (IPin *pCapturePin, guint bufSizeMS);
#endif /* _GSTDSHOW_ */

17
sys/dshowsrcwrapper/gstdshowaudiosrc.cpp
View file

@ -626,6 +626,18 @@ gst_dshowaudiosrc_prepare (GstAudioSrc * asrc, GstRingBufferSpec * spec)
goto error;
}
spec->segsize = (gint) (spec->bytes_per_sample * spec->rate * spec->latency_time /
GST_MSECOND);
spec->segtotal = (gint) ((gfloat) spec->buffer_time /
(gfloat) spec->latency_time + 0.5);
if (!gst_dshow_configure_latency (pin_mediatype->capture_pin,
spec->segsize))
{
GST_WARNING ("Could not change capture latency");
spec->segsize = spec->rate * spec->channels;
spec->segtotal = 2;
};
GST_INFO ("Configuring with segsize:%d segtotal:%d", spec->segsize, spec->segtotal);
hres = src->filter_graph->ConnectDirect (pin_mediatype->capture_pin,
input_pin, NULL);
input_pin->Release ();
@ -637,8 +649,6 @@ gst_dshowaudiosrc_prepare (GstAudioSrc * asrc, GstRingBufferSpec * spec)
goto error;
}
spec->segsize = spec->rate * spec->channels;
spec->segtotal = 1;
}
}
}
@ -720,7 +730,8 @@ gst_dshowaudiosrc_read (GstAudioSrc * asrc, gpointer data, guint length)
g_mutex_unlock (src->gbarray_lock);
} else {
if (src->is_running) {
Sleep (100);
Sleep (GST_BASE_AUDIO_SRC(src)->ringbuffer->spec.latency_time /
GST_MSECOND / 10);
goto test;
}
}