/*

     File: CAAudioBufferList.cpp 

 Abstract:  CAAudioBufferList.h  

  Version: 1.0 

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*/

//=============================================================================

//  Includes

//=============================================================================

#include "CAAudioBufferList.h"

#include "CADebugMacros.h"

#include "CALogMacros.h"

#include <stdlib.h>

#include <string.h>

//=============================================================================

//  CAAudioBufferList

//=============================================================================

AudioBufferList*    CAAudioBufferList::Create(UInt32 inNumberBuffers)

{

    UInt32 theSize = CalculateByteSize(inNumberBuffers);

    AudioBufferList* theAnswer = static_cast<AudioBufferList*>(calloc(1, theSize));

    if(theAnswer != NULL)

    {

        theAnswer->mNumberBuffers = inNumberBuffers;

    }

    return theAnswer;

}

void    CAAudioBufferList::Destroy(AudioBufferList* inBufferList)

{

    free(inBufferList);

}

UInt32  CAAudioBufferList::CalculateByteSize(UInt32 inNumberBuffers)

{

    UInt32 theSize = SizeOf32(AudioBufferList) - SizeOf32(AudioBuffer);

    theSize += inNumberBuffers * SizeOf32(AudioBuffer);

    return theSize;

}

UInt32  CAAudioBufferList::GetTotalNumberChannels(const AudioBufferList& inBufferList)

{

    UInt32 theAnswer = 0;

    for(UInt32 theIndex = 0; theIndex < inBufferList.mNumberBuffers; ++theIndex)

    {

        theAnswer += inBufferList.mBuffers[theIndex].mNumberChannels;

    }

    return theAnswer;

}

bool    CAAudioBufferList::GetBufferForChannel(const AudioBufferList& inBufferList, UInt32 inChannel, UInt32& outBufferNumber, UInt32& outBufferChannel)

{

    bool theAnswer = false;

    UInt32 theIndex = 0;

    while((theIndex < inBufferList.mNumberBuffers) && (inChannel >= inBufferList.mBuffers[theIndex].mNumberChannels))

    {

        inChannel -= inBufferList.mBuffers[theIndex].mNumberChannels;

        ++theIndex;

    }

    if(theIndex < inBufferList.mNumberBuffers)

    {

        outBufferNumber = theIndex;

        outBufferChannel = inChannel;

        theAnswer = true;

    }

    return theAnswer;

}

void    CAAudioBufferList::Clear(AudioBufferList& outBufferList)

{

    //  assumes that "0" is actually the 0 value for this stream format

    for(UInt32 theBufferIndex = 0; theBufferIndex < outBufferList.mNumberBuffers; ++theBufferIndex)

    {

        if(outBufferList.mBuffers[theBufferIndex].mData != NULL)

        {

            memset(outBufferList.mBuffers[theBufferIndex].mData, 0, outBufferList.mBuffers[theBufferIndex].mDataByteSize);

        }

    }

}

void    CAAudioBufferList::Copy(const AudioBufferList& inSource, UInt32 inStartingSourceChannel, AudioBufferList& outDestination, UInt32 inStartingDestinationChannel)

{

    //  This is a brute force copy method that can handle ABL's that have different buffer layouts

    //  This means that this method is probably not the fastest way to do this for all cases.

    //  This method also assumes that both the source and destination sample formats are Float32

    UInt32 theInputChannel = inStartingSourceChannel;

    UInt32 theNumberInputChannels = GetTotalNumberChannels(inSource);

    UInt32 theOutputChannel = inStartingDestinationChannel;

    UInt32 theNumberOutputChannels = GetTotalNumberChannels(outDestination);

    UInt32 theInputBufferIndex = 0;

    UInt32 theInputBufferChannel = 0;

    UInt32 theOutputBufferIndex = 0;

    UInt32 theOutputBufferChannel = 0;

    while((theInputChannel < theNumberInputChannels) && (theOutputChannel < theNumberOutputChannels))

    {

        GetBufferForChannel(inSource, theInputChannel, theInputBufferIndex, theInputBufferChannel);

        GetBufferForChannel(inSource, theOutputChannel, theOutputBufferIndex, theOutputBufferChannel);

        CopyChannel(inSource.mBuffers[theInputBufferIndex], theInputBufferChannel, outDestination.mBuffers[theOutputBufferIndex], theOutputBufferChannel);

        ++theInputChannel;

        ++theOutputChannel;

    }

}

void    CAAudioBufferList::CopyChannel(const AudioBuffer& inSource, UInt32 inSourceChannel, AudioBuffer& outDestination, UInt32 inDestinationChannel)

{

    //  set up the stuff for the loop

    UInt32 theNumberFramesToCopy = outDestination.mDataByteSize / (outDestination.mNumberChannels * SizeOf32(Float32));

    const Float32* theSource = static_cast<const Float32*>(inSource.mData);

    Float32* theDestination = static_cast<Float32*>(outDestination.mData);

    //  loop through the data and copy the samples

    while(theNumberFramesToCopy > 0)

    {

        //  copy the data

        theDestination[inDestinationChannel] = theSource[inSourceChannel];

        //  adjust the pointers

        --theNumberFramesToCopy;

        theSource += inSource.mNumberChannels;

        theDestination += outDestination.mNumberChannels;

    }

}

void    CAAudioBufferList::Sum(const AudioBufferList& inSourceBufferList, AudioBufferList& ioSummedBufferList)

{

    //  assumes that the buffers are Float32 samples and the listst have the same layout

    //  this is a lame algorithm, by the way. it could at least be unrolled a couple of times

    for(UInt32 theBufferIndex = 0; theBufferIndex < ioSummedBufferList.mNumberBuffers; ++theBufferIndex)

    {

        Float32* theSourceBuffer = static_cast<Float32*>(inSourceBufferList.mBuffers[theBufferIndex].mData);

        Float32* theSummedBuffer = static_cast<Float32*>(ioSummedBufferList.mBuffers[theBufferIndex].mData);

        UInt32 theNumberSamplesToMix = ioSummedBufferList.mBuffers[theBufferIndex].mDataByteSize / SizeOf32(Float32);

        if((theSourceBuffer != NULL) && (theSummedBuffer != NULL) && (theNumberSamplesToMix > 0))

        {

            while(theNumberSamplesToMix > 0)

            {

                *theSummedBuffer += *theSourceBuffer;

                ++theSummedBuffer;

                ++theSourceBuffer;

                --theNumberSamplesToMix;

            }

        }

    }

}

bool    CAAudioBufferList::HasData(AudioBufferList& inBufferList)

{

    bool hasData = false;

    for(UInt32 theBufferIndex = 0; !hasData && (theBufferIndex < inBufferList.mNumberBuffers); ++theBufferIndex)

    {

        if(inBufferList.mBuffers[theBufferIndex].mData != NULL)

        {

            UInt32* theBuffer = (UInt32*)inBufferList.mBuffers[theBufferIndex].mData;

            UInt32 theNumberSamples = inBufferList.mBuffers[theBufferIndex].mDataByteSize / SizeOf32(UInt32);

            for(UInt32 theSampleIndex = 0; !hasData && (theSampleIndex < theNumberSamples); ++theSampleIndex)

            {

                hasData = theBuffer[theSampleIndex] != 0;

            }

        }

    }

    return hasData;

}

#if CoreAudio_Debug

void    CAAudioBufferList::PrintToLog(const AudioBufferList& inBufferList)

{

    PrintInt("  Number streams: ", inBufferList.mNumberBuffers);

    for(UInt32 theIndex = 0; theIndex < inBufferList.mNumberBuffers; ++theIndex)

    {

        PrintIndexedInt("  Channels in stream", theIndex + 1, inBufferList.mBuffers[theIndex].mNumberChannels);

        PrintIndexedInt("  Buffer size of stream", theIndex + 1, inBufferList.mBuffers[theIndex].mDataByteSize);

    }

}

#endif

AudioBufferList CAAudioBufferList::sEmptyBufferList = { 0, { { 0, 0, NULL } } };