AllocateABL.cpp

/*
 *  Copyright (C) 2010, 2011, 2012 Stephen F. Booth <me@sbooth.org>
 *  All Rights Reserved.
 *
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 *    - Redistributions in binary form must reproduce the above copyright
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 *      documentation and/or other materials provided with the distribution.
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 *      from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include <stdlib.h>
#include <stddef.h>
#include <assert.h>

#include "AllocateABL.h"

AudioBufferList * 
AllocateABL(const AudioStreamBasicDescription& format, UInt32 capacityFrames)
{
	return AllocateABL(format.mChannelsPerFrame, format.mBytesPerFrame, !(kAudioFormatFlagIsNonInterleaved & format.mFormatFlags), capacityFrames);
}

AudioBufferList *
AllocateABL(UInt32 channelsPerFrame, UInt32 bytesPerFrame, bool interleaved, UInt32 capacityFrames)
{
	AudioBufferList *bufferList = nullptr;
	
	UInt32 numBuffers = interleaved ? 1 : channelsPerFrame;
	UInt32 channelsPerBuffer = interleaved ? channelsPerFrame : 1;
	
	bufferList = static_cast<AudioBufferList *>(calloc(1, offsetof(AudioBufferList, mBuffers) + (sizeof(AudioBuffer) * numBuffers)));
	
	bufferList->mNumberBuffers = numBuffers;
	
	for(UInt32 bufferIndex = 0; bufferIndex < bufferList->mNumberBuffers; ++bufferIndex) {
		bufferList->mBuffers[bufferIndex].mData = static_cast<void *>(calloc(capacityFrames, bytesPerFrame));
		bufferList->mBuffers[bufferIndex].mDataByteSize = capacityFrames * bytesPerFrame;
		bufferList->mBuffers[bufferIndex].mNumberChannels = channelsPerBuffer;
	}
	
	return bufferList;
}