FLACDecodeFilter.cpp

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//===========================================================================
//Copyright (C) 2003, 2004 Zentaro Kavanagh
//
//Redistribution and use in source and binary forms, with or without
//modification, are permitted provided that the following conditions
//are met:
//
//- Redistributions of source code must retain the above copyright
//  notice, this list of conditions and the following disclaimer.
//
//- Redistributions in binary form must reproduce the above copyright
//  notice, this list of conditions and the following disclaimer in the
//  documentation and/or other materials provided with the distribution.
//
//- Neither the name of Zentaro Kavanagh nor the names of contributors 
//  may be used to endorse or promote products derived from this software 
//  without specific prior written permission.
//
//THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
//``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
//LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
//PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE ORGANISATION OR
//CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
//EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
//PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
//PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
//LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
//NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
//SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//===========================================================================

#include "stdafx.h"
#include "FLACDecodeFilter.h"


//COM Factory Template
CFactoryTemplate g_Templates[] = 
{
    { 
                L"FLAC Decode Filter",                                          // Name
            &CLSID_FLACDecodeFilter,            // CLSID
            FLACDecodeFilter::CreateInstance,   // Method to create an instance of MyComponent
        NULL,                                                                   // Initialization function
        NULL                                                                    // Set-up information (for filters)
    }

};

// Generic way of determining the number of items in the template
int g_cTemplates = sizeof(g_Templates) / sizeof(g_Templates[0]); 

FLACDecodeFilter::FLACDecodeFilter(void)
        :       AbstractTransformFilter(NAME("FLAC Audio Decoder"), CLSID_FLACDecodeFilter)
        ,       mFLACFormatBlock(NULL)
{
        bool locWasConstructed = ConstructPins();
}

FLACDecodeFilter::~FLACDecodeFilter(void)
{
        delete mFLACFormatBlock;
        mFLACFormatBlock = NULL;
}

bool FLACDecodeFilter::ConstructPins() 
{
        //Vector to hold our set of media types we want to accept.
        vector<CMediaType*> locAcceptableTypes;

        //Setup the media types for the output pin.
        CMediaType* locAcceptMediaType = new CMediaType(&MEDIATYPE_Audio);              //Deleted in pin destructor
        locAcceptMediaType->subtype = MEDIASUBTYPE_PCM;
        locAcceptMediaType->formattype = FORMAT_WaveFormatEx;
        
        locAcceptableTypes.push_back(locAcceptMediaType);

        //Output pin must be done first because it's passed to the input pin.
        mOutputPin = new FLACDecodeOutputPin(this, m_pLock, locAcceptableTypes);                        //Deleted in base class destructor

        //Clear out the vector, now we've already passed it to the output pin.
        locAcceptableTypes.clear();

        //Setup the media Types for the input pin.
        locAcceptMediaType = NULL;
        locAcceptMediaType = new CMediaType(&MEDIATYPE_Audio);                  //Deleted by pin

        locAcceptMediaType->majortype = MEDIATYPE_OggPacketStream;
        locAcceptMediaType->subtype = MEDIASUBTYPE_None;
        locAcceptMediaType->formattype = FORMAT_OggIdentHeader;

        locAcceptableTypes.push_back(locAcceptMediaType);
        
        mInputPin = new FLACDecodeInputPin(this, m_pLock, mOutputPin, locAcceptableTypes);      //Deleted in base class filter destructor.
        return true;

}

CUnknown* WINAPI FLACDecodeFilter::CreateInstance(LPUNKNOWN pUnk, HRESULT *pHr) 
{
        //This routine is the COM implementation to create a new Filter
        FLACDecodeFilter *pNewObject = new FLACDecodeFilter();
    if (pNewObject == NULL) {
        *pHr = E_OUTOFMEMORY;
    }
        return pNewObject;
} 

sFLACFormatBlock* FLACDecodeFilter::getFLACFormatBlock() 
{
        return mFLACFormatBlock;
}
void FLACDecodeFilter::setFLACFormatBlock(BYTE* inFormatBlock) 
{
        delete mFLACFormatBlock;
        mFLACFormatBlock = new sFLACFormatBlock;                //Deleted in destructor.

        const unsigned char FLAC_CHANNEL_MASK = 14;  //00001110
        const unsigned char FLAC_BPS_START_MASK = 1; //00000001
        const unsigned char FLAC_BPS_END_MASK = 240;  //11110000
        mFLACFormatBlock = new sFLACFormatBlock;
        //Fix the format block data... use header version and other version.
        //mFLACFormatBlock->FLACVersion = FLACMath::charArrToULong(mCodecHeaders->getPacket(1)->packetData() + 28);


        //This is ogg flac classic
        mFLACFormatBlock->numChannels = (((inFormatBlock[20]) & FLAC_CHANNEL_MASK) >> 1) + 1;
        mFLACFormatBlock->samplesPerSec = (iBE_Math::charArrToULong(inFormatBlock + 18)) >> 12;
        
        mFLACFormatBlock->numBitsPerSample =    (((inFormatBlock[20] & FLAC_BPS_START_MASK) << 4)       |
                                                                                        ((inFormatBlock[21] & FLAC_BPS_END_MASK) >> 4)) + 1;    

        //*mFLACFormatBlock = *inFormatBlock;

}

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