gstreamer/sys/dshowdecwrapper/gstdshowutil.cpp

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/* GStreamer
* Copyright (C) 2007 Sebastien Moutte <sebastien@moutte.net>
*
* gstdshow.cpp:
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <dmodshow.h>
#include <dmoreg.h>
#include "gstdshowutil.h"
#include "gstdshowfakesrc.h"
_COM_SMARTPTR_TYPEDEF(IDMOWrapperFilter, __uuidof(IDMOWrapperFilter));
IPin *
gst_dshow_get_pin_from_filter (IBaseFilter *filter, PIN_DIRECTION pindir)
{
IEnumPinsPtr enumpins;
IPinPtr pin;
HRESULT hres;
hres = filter->EnumPins (&enumpins);
if (FAILED(hres)) {
return NULL;
}
while (enumpins->Next (1, &pin, NULL) == S_OK)
{
PIN_DIRECTION pindirtmp;
hres = pin->QueryDirection (&pindirtmp);
if (hres == S_OK && pindir == pindirtmp) {
return pin;
}
pin.Release();
}
return NULL;
}
IBaseFilter *
gst_dshow_find_filter(CLSID input_majortype, CLSID input_subtype,
CLSID output_majortype, CLSID output_subtype,
PreferredFilter *preferred_filters)
{
HRESULT hres;
GUID inTypes[2];
GUID outTypes[2];
IFilterMapper2Ptr mapper;
IEnumMonikerPtr enum_moniker;
IMonikerPtr moniker;
ULONG fetched;
IBaseFilter *filter;
/* First, see if any of our preferred filters is available.
* If not, we fall back to the highest-ranked installed filter */
if (preferred_filters) {
while (preferred_filters->filter_guid)
{
/* If the filter is a DMO, we need to do this a bit differently */
if (preferred_filters->dmo_category)
{
IDMOWrapperFilterPtr wrapper;
hres = CoCreateInstance (CLSID_DMOWrapperFilter, NULL,
CLSCTX_INPROC,
IID_IBaseFilter, (void **)&filter);
if (SUCCEEDED(hres)) {
hres = filter->QueryInterface (&wrapper);
if (SUCCEEDED(hres)) {
hres = wrapper->Init (*preferred_filters->filter_guid,
*preferred_filters->dmo_category);
if (SUCCEEDED(hres))
return filter;
}
filter->Release();
}
}
else
{
hres = CoCreateInstance (*preferred_filters->filter_guid,
NULL, CLSCTX_INPROC,
IID_IBaseFilter, (void **)&filter);
if (SUCCEEDED(hres))
return filter;
}
/* Continue to the next filter */
preferred_filters++;
}
}
hres = CoCreateInstance(CLSID_FilterMapper2, NULL, CLSCTX_INPROC,
IID_IFilterMapper2, (void **) &mapper);
if (FAILED(hres))
return NULL;
inTypes[0] = input_majortype;
inTypes[1] = input_subtype;
outTypes[0] = output_majortype;
outTypes[1] = output_subtype;
hres = mapper->EnumMatchingFilters (&enum_moniker, 0,
FALSE, MERIT_DO_NOT_USE+1,
TRUE, 1, inTypes, NULL, NULL, FALSE,
TRUE, 1, outTypes, NULL, NULL);
if (FAILED(hres))
return NULL;
enum_moniker->Reset ();
while(enum_moniker->Next (1, &moniker, &fetched) == S_OK)
{
hres = moniker->BindToObject(NULL, NULL,
IID_IBaseFilter, (void**)&filter);
if(SUCCEEDED(hres)) {
return filter;
}
moniker.Release ();
}
return NULL;
}