vp8decoder/dllentry.cpp

// Copyright (c) 2010 The WebM project authors. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license and patent
// grant that can be found in the LICENSE file in the root of the source
// tree. All contributing project authors may be found in the AUTHORS
// file in the root of the source tree.

#include <strmif.h>
#include "cfactory.hpp"
#include "comreg.hpp"
#include "vp8decoderidl.h"
#include <cassert>
#include <comdef.h>
#include <uuids.h>
#include "graphutil.hpp"
#include "webmtypes.hpp"

HMODULE g_hModule;
static ULONG s_cLock;

namespace VP8DecoderLib
{
    HRESULT CreateInstance(
            IClassFactory*,
            IUnknown*, 
            const IID&, 
            void**);

}  //end namespace VP8DecoderLib


static CFactory s_factory(&s_cLock, &VP8DecoderLib::CreateInstance);


BOOL APIENTRY DllMain(
    HINSTANCE hModule, 
    DWORD  dwReason, 
    LPVOID)
{
   switch (dwReason)
   {
       case DLL_PROCESS_ATTACH:
        {
            g_hModule = hModule;
           break;
        }
       case DLL_THREAD_ATTACH:
       case DLL_THREAD_DETACH:
       case DLL_PROCESS_DETACH:
       default:
          break;
   }
   
    return TRUE;
}



STDAPI DllCanUnloadNow()
{
    return s_cLock ? S_FALSE : S_OK;
}


STDAPI DllGetClassObject(
    const CLSID& clsid,
    const IID& iid,
    void** ppv)
{
    if (clsid == CLSID_VP8Decoder)
        return s_factory.QueryInterface(iid, ppv);

    return CLASS_E_CLASSNOTAVAILABLE;
}


STDAPI DllUnregisterServer()
{
    const GraphUtil::IFilterMapper2Ptr pMapper(CLSID_FilterMapper2);
    assert(bool(pMapper));

    HRESULT hr = pMapper->UnregisterFilter(
                    &CLSID_LegacyAmFilterCategory,
                    0,
                    CLSID_VP8Decoder);

    //TODO                    
    //assert(SUCCEEDED(hr));
    
    hr = ComReg::UnRegisterCoclass(CLSID_VP8Decoder);

    std::wstring filename_;

    hr = ComReg::ComRegGetModuleFileName(g_hModule, filename_);
    assert(SUCCEEDED(hr));
    assert(!filename_.empty());
    
    const wchar_t* const filename = filename_.c_str();

    hr = ComReg::UnRegisterTypeLibResource(filename);

    return S_OK;  //TODO
}


STDAPI DllRegisterServer()
{
    std::wstring filename_;

    HRESULT hr = ComReg::ComRegGetModuleFileName(g_hModule, filename_);
    assert(SUCCEEDED(hr));
    assert(!filename_.empty());
    
    const wchar_t* const filename = filename_.c_str();

#if _DEBUG    
    const wchar_t friendlyname[] = L"WebM VP8 Decoder Filter (Debug)";
#else
    const wchar_t friendlyname[] = L"WebM VP8 Decoder Filter";
#endif

    hr = DllUnregisterServer();
    assert(SUCCEEDED(hr));
    
    hr = ComReg::RegisterTypeLibResource(filename, 0);
    assert(SUCCEEDED(hr));
            
    hr = ComReg::RegisterCoclass(
            CLSID_VP8Decoder,
            friendlyname,
            filename,
            L"Webm.VP8Decoder",
            L"Webm.VP8Decoder.1",
            false,  //not insertable
            false,  //not a control
            ComReg::kBoth,  //DShow filters must support "both"
            LIBID_VP8DecoderLib,     //typelib
            0,    //no version specified
            0);   //no toolbox bitmap
            
    assert(SUCCEEDED(hr));
    
    const GraphUtil::IFilterMapper2Ptr pMapper(CLSID_FilterMapper2);
    assert(bool(pMapper));
    
    enum { cPins = 2 };
    REGFILTERPINS pins[cPins];
    
    REGFILTERPINS& inpin = pins[0];
    
    enum { nInpinMediaTypes = 1 };
    const REGPINTYPES inpinMediaTypes[nInpinMediaTypes] =
    {
        { &MEDIATYPE_Video, &WebmTypes::MEDIASUBTYPE_VP80 }
    };

    inpin.strName = 0;              //obsolete
    inpin.bRendered = FALSE;        //TODO: ?
    inpin.bOutput = FALSE;
    inpin.bZero = FALSE;
    inpin.bMany = FALSE;
    inpin.clsConnectsToFilter = 0;  //obsolete
    inpin.strConnectsToPin = 0;     //obsolete    
    inpin.nMediaTypes = nInpinMediaTypes;
    inpin.lpMediaType = inpinMediaTypes;

    REGFILTERPINS& outpin = pins[1];

    enum { nOutpinMediaTypes = 2 };
    const REGPINTYPES outpinMediaTypes[nOutpinMediaTypes] =
    {
        { &MEDIATYPE_Video, &MEDIASUBTYPE_YV12 },
        { &MEDIATYPE_Video, &WebmTypes::MEDIASUBTYPE_I420 }
    };

    outpin.strName = 0;              //obsolete
    outpin.bRendered = FALSE;        //always FALSE for outpins
    outpin.bOutput = TRUE;
    outpin.bZero = FALSE;
    outpin.bMany = FALSE;
    outpin.clsConnectsToFilter = 0;  //obsolete
    outpin.strConnectsToPin = 0;     //obsolete    
    outpin.nMediaTypes = nOutpinMediaTypes;
    outpin.lpMediaType = outpinMediaTypes;

    //pin setup complete
    
    REGFILTER2 filter;
    
    filter.dwVersion = 1;
    filter.dwMerit = MERIT_NORMAL;
    filter.cPins = cPins;
    filter.rgPins = pins;
    
    hr = pMapper->RegisterFilter(
            CLSID_VP8Decoder,
            friendlyname,
            0,
            &CLSID_LegacyAmFilterCategory,
            0,
            &filter);                       

    return hr;
}