static gboolean
gst_dshowvideodec_create_graph_and_filters (GstDshowVideoDec * vdec)
{
HRESULT hres = S_FALSE;
GstDshowVideoDecClass *klass =
(GstDshowVideoDecClass *) G_OBJECT_GET_CLASS (vdec);
/* create the filter graph manager object */
hres = CoCreateInstance (&CLSID_FilterGraph, NULL, CLSCTX_INPROC,
&IID_IFilterGraph, (LPVOID *) & vdec->filtergraph);
if (hres != S_OK || !vdec->filtergraph) {
GST_ELEMENT_ERROR (vdec, STREAM, FAILED, ("Can't create an instance "
"of the directshow graph manager (error=%d)", hres), (NULL));
goto error;
}
hres = IFilterGraph_QueryInterface (vdec->filtergraph, &IID_IMediaFilter,
(void **) &vdec->mediafilter);
if (hres != S_OK || !vdec->mediafilter) {
GST_ELEMENT_ERROR (vdec, STREAM, FAILED,
("Can't get IMediacontrol interface "
"from the graph manager (error=%d)", hres), (NULL));
goto error;
}
/* create fake src filter */
hres = CoCreateInstance (&CLSID_DshowFakeSrc, NULL, CLSCTX_INPROC,
&IID_IBaseFilter, (LPVOID *) & vdec->srcfilter);
if (hres != S_OK || !vdec->srcfilter) {
GST_ELEMENT_ERROR (vdec, STREAM, FAILED, ("Can't create an instance "
"of the directshow fakesrc (error=%d)", hres), (NULL));
goto error;
}
/* search a decoder filter and create it */
if (!gst_dshow_find_filter (klass->entry->input_majortype,
klass->entry->input_subtype,
klass->entry->output_majortype,
klass->entry->output_subtype,
klass->entry->preferred_filter_substring, &vdec->decfilter)) {
GST_ELEMENT_ERROR (vdec, STREAM, FAILED, ("Can't create an instance "
"of the decoder filter"), (NULL));
goto error;
}
/* create fake sink filter */
hres = CoCreateInstance (&CLSID_DshowFakeSink, NULL, CLSCTX_INPROC,
&IID_IBaseFilter, (LPVOID *) & vdec->sinkfilter);
if (hres != S_OK || !vdec->sinkfilter) {
GST_ELEMENT_ERROR (vdec, STREAM, FAILED, ("Can't create an instance "
"of the directshow fakesink (error=%d)", hres), (NULL));
goto error;
}
/* add filters to the graph */
hres = IFilterGraph_AddFilter (vdec->filtergraph, vdec->srcfilter, L"src");
if (hres != S_OK) {
GST_ELEMENT_ERROR (vdec, STREAM, FAILED, ("Can't add fakesrc filter "
"to the graph (error=%d)", hres), (NULL));
goto error;
}
hres =
IFilterGraph_AddFilter (vdec->filtergraph, vdec->decfilter, L"decoder");
if (hres != S_OK) {
GST_ELEMENT_ERROR (vdec, STREAM, FAILED, ("Can't add decoder filter "
"to the graph (error=%d)", hres), (NULL));
goto error;
}
hres = IFilterGraph_AddFilter (vdec->filtergraph, vdec->sinkfilter, L"sink");
if (hres != S_OK) {
GST_ELEMENT_ERROR (vdec, STREAM, FAILED, ("Can't add fakesink filter "
"to the graph (error=%d)", hres), (NULL));
goto error;
}
return TRUE;
error:
if (vdec->srcfilter) {
IBaseFilter_Release (vdec->srcfilter);
vdec->srcfilter = NULL;
}
if (vdec->decfilter) {
IBaseFilter_Release (vdec->decfilter);
vdec->decfilter = NULL;
}
if (vdec->sinkfilter) {
IBaseFilter_Release (vdec->sinkfilter);
vdec->sinkfilter = NULL;
}
if (vdec->mediafilter) {
IMediaFilter_Release (vdec->mediafilter);
vdec->mediafilter = NULL;
}
if (vdec->filtergraph) {
IFilterGraph_Release (vdec->filtergraph);
vdec->filtergraph = NULL;
}
return FALSE;
}
static gboolean
gst_dshowaudiosrc_open (GstAudioSrc * asrc)
{
HRESULT hres = S_FALSE;
GstDshowAudioSrc *src = GST_DSHOWAUDIOSRC (asrc);
hres = CoCreateInstance (&CLSID_FilterGraph, NULL, CLSCTX_INPROC,
&IID_IFilterGraph, (LPVOID *) & src->filter_graph);
if (hres != S_OK || !src->filter_graph) {
GST_CAT_ERROR (dshowaudiosrc_debug,
"Can't create an instance of the directshow graph manager (error=%d)",
hres);
goto error;
}
hres = IFilterGraph_QueryInterface (src->filter_graph, &IID_IMediaFilter,
(void **) &src->media_filter);
if (hres != S_OK || !src->media_filter) {
GST_CAT_ERROR (dshowaudiosrc_debug,
"Can't get IMediacontrol interface from the graph manager (error=%d)",
hres);
goto error;
}
hres = CoCreateInstance (&CLSID_DshowFakeSink, NULL, CLSCTX_INPROC,
&IID_IBaseFilter, (LPVOID *) & src->dshow_fakesink);
if (hres != S_OK || !src->dshow_fakesink) {
GST_CAT_ERROR (dshowaudiosrc_debug,
"Can't create an instance of the directshow fakesink (error=%d)", hres);
goto error;
}
hres =
IFilterGraph_AddFilter (src->filter_graph, src->audio_cap_filter,
L"capture");
if (hres != S_OK) {
GST_CAT_ERROR (dshowaudiosrc_debug,
"Can't add the directshow capture filter to the graph (error=%d)",
hres);
goto error;
}
hres =
IFilterGraph_AddFilter (src->filter_graph, src->dshow_fakesink,
L"fakesink");
if (hres != S_OK) {
GST_CAT_ERROR (dshowaudiosrc_debug,
"Can't add our fakesink filter to the graph (error=%d)", hres);
goto error;
}
return TRUE;
error:
if (src->dshow_fakesink) {
IBaseFilter_Release (src->dshow_fakesink);
src->dshow_fakesink = NULL;
}
if (src->media_filter) {
IMediaFilter_Release (src->media_filter);
src->media_filter = NULL;
}
if (src->filter_graph) {
IFilterGraph_Release (src->filter_graph);
src->filter_graph = NULL;
}
return FALSE;
}
