240 lines
9.0 KiB
C++
240 lines
9.0 KiB
C++
/*
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File: CAAudioBufferList.cpp
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Abstract: CAAudioBufferList.h
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Version: 1.1
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Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
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Inc. ("Apple") in consideration of your agreement to the following
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terms, and your use, installation, modification or redistribution of
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this Apple software constitutes acceptance of these terms. If you do
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not agree with these terms, please do not use, install, modify or
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redistribute this Apple software.
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In consideration of your agreement to abide by the following terms, and
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subject to these terms, Apple grants you a personal, non-exclusive
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license, under Apple's copyrights in this original Apple software (the
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"Apple Software"), to use, reproduce, modify and redistribute the Apple
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Software, with or without modifications, in source and/or binary forms;
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provided that if you redistribute the Apple Software in its entirety and
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without modifications, you must retain this notice and the following
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text and disclaimers in all such redistributions of the Apple Software.
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Neither the name, trademarks, service marks or logos of Apple Inc. may
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be used to endorse or promote products derived from the Apple Software
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without specific prior written permission from Apple. Except as
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expressly stated in this notice, no other rights or licenses, express or
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implied, are granted by Apple herein, including but not limited to any
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patent rights that may be infringed by your derivative works or by other
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works in which the Apple Software may be incorporated.
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The Apple Software is provided by Apple on an "AS IS" basis. APPLE
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MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
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THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
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FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
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OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
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IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
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OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
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MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
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AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
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STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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Copyright (C) 2014 Apple Inc. All Rights Reserved.
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*/
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//=============================================================================
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// Includes
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//=============================================================================
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#include "CAAudioBufferList.h"
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#include "CADebugMacros.h"
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#include "CALogMacros.h"
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#include <stdlib.h>
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#include <string.h>
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//=============================================================================
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// CAAudioBufferList
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//=============================================================================
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AudioBufferList* CAAudioBufferList::Create(UInt32 inNumberBuffers)
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{
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UInt32 theSize = CalculateByteSize(inNumberBuffers);
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AudioBufferList* theAnswer = static_cast<AudioBufferList*>(calloc(1, theSize));
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if(theAnswer != NULL)
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{
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theAnswer->mNumberBuffers = inNumberBuffers;
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}
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return theAnswer;
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}
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void CAAudioBufferList::Destroy(AudioBufferList* inBufferList)
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{
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free(inBufferList);
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}
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UInt32 CAAudioBufferList::CalculateByteSize(UInt32 inNumberBuffers)
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{
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UInt32 theSize = SizeOf32(AudioBufferList) - SizeOf32(AudioBuffer);
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theSize += inNumberBuffers * SizeOf32(AudioBuffer);
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return theSize;
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}
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UInt32 CAAudioBufferList::GetTotalNumberChannels(const AudioBufferList& inBufferList)
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{
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UInt32 theAnswer = 0;
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for(UInt32 theIndex = 0; theIndex < inBufferList.mNumberBuffers; ++theIndex)
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{
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theAnswer += inBufferList.mBuffers[theIndex].mNumberChannels;
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}
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return theAnswer;
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}
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bool CAAudioBufferList::GetBufferForChannel(const AudioBufferList& inBufferList, UInt32 inChannel, UInt32& outBufferNumber, UInt32& outBufferChannel)
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{
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bool theAnswer = false;
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UInt32 theIndex = 0;
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while((theIndex < inBufferList.mNumberBuffers) && (inChannel >= inBufferList.mBuffers[theIndex].mNumberChannels))
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{
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inChannel -= inBufferList.mBuffers[theIndex].mNumberChannels;
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++theIndex;
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}
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if(theIndex < inBufferList.mNumberBuffers)
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{
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outBufferNumber = theIndex;
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outBufferChannel = inChannel;
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theAnswer = true;
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}
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return theAnswer;
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}
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void CAAudioBufferList::Clear(AudioBufferList& outBufferList)
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{
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// assumes that "0" is actually the 0 value for this stream format
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for(UInt32 theBufferIndex = 0; theBufferIndex < outBufferList.mNumberBuffers; ++theBufferIndex)
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{
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if(outBufferList.mBuffers[theBufferIndex].mData != NULL)
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{
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memset(outBufferList.mBuffers[theBufferIndex].mData, 0, outBufferList.mBuffers[theBufferIndex].mDataByteSize);
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}
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}
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}
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void CAAudioBufferList::Copy(const AudioBufferList& inSource, UInt32 inStartingSourceChannel, AudioBufferList& outDestination, UInt32 inStartingDestinationChannel)
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{
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// This is a brute force copy method that can handle ABL's that have different buffer layouts
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// This means that this method is probably not the fastest way to do this for all cases.
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// This method also assumes that both the source and destination sample formats are Float32
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UInt32 theInputChannel = inStartingSourceChannel;
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UInt32 theNumberInputChannels = GetTotalNumberChannels(inSource);
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UInt32 theOutputChannel = inStartingDestinationChannel;
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UInt32 theNumberOutputChannels = GetTotalNumberChannels(outDestination);
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UInt32 theInputBufferIndex = 0;
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UInt32 theInputBufferChannel = 0;
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UInt32 theOutputBufferIndex = 0;
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UInt32 theOutputBufferChannel = 0;
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while((theInputChannel < theNumberInputChannels) && (theOutputChannel < theNumberOutputChannels))
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{
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GetBufferForChannel(inSource, theInputChannel, theInputBufferIndex, theInputBufferChannel);
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GetBufferForChannel(inSource, theOutputChannel, theOutputBufferIndex, theOutputBufferChannel);
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CopyChannel(inSource.mBuffers[theInputBufferIndex], theInputBufferChannel, outDestination.mBuffers[theOutputBufferIndex], theOutputBufferChannel);
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++theInputChannel;
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++theOutputChannel;
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}
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}
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void CAAudioBufferList::CopyChannel(const AudioBuffer& inSource, UInt32 inSourceChannel, AudioBuffer& outDestination, UInt32 inDestinationChannel)
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{
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// set up the stuff for the loop
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UInt32 theNumberFramesToCopy = outDestination.mDataByteSize / (outDestination.mNumberChannels * SizeOf32(Float32));
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const Float32* theSource = static_cast<const Float32*>(inSource.mData);
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Float32* theDestination = static_cast<Float32*>(outDestination.mData);
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// loop through the data and copy the samples
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while(theNumberFramesToCopy > 0)
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{
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// copy the data
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theDestination[inDestinationChannel] = theSource[inSourceChannel];
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// adjust the pointers
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--theNumberFramesToCopy;
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theSource += inSource.mNumberChannels;
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theDestination += outDestination.mNumberChannels;
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}
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}
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void CAAudioBufferList::Sum(const AudioBufferList& inSourceBufferList, AudioBufferList& ioSummedBufferList)
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{
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// assumes that the buffers are Float32 samples and the listst have the same layout
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// this is a lame algorithm, by the way. it could at least be unrolled a couple of times
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for(UInt32 theBufferIndex = 0; theBufferIndex < ioSummedBufferList.mNumberBuffers; ++theBufferIndex)
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{
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Float32* theSourceBuffer = static_cast<Float32*>(inSourceBufferList.mBuffers[theBufferIndex].mData);
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Float32* theSummedBuffer = static_cast<Float32*>(ioSummedBufferList.mBuffers[theBufferIndex].mData);
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UInt32 theNumberSamplesToMix = ioSummedBufferList.mBuffers[theBufferIndex].mDataByteSize / SizeOf32(Float32);
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if((theSourceBuffer != NULL) && (theSummedBuffer != NULL) && (theNumberSamplesToMix > 0))
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{
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while(theNumberSamplesToMix > 0)
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{
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*theSummedBuffer += *theSourceBuffer;
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++theSummedBuffer;
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++theSourceBuffer;
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--theNumberSamplesToMix;
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}
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}
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}
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}
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bool CAAudioBufferList::HasData(AudioBufferList& inBufferList)
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{
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bool hasData = false;
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for(UInt32 theBufferIndex = 0; !hasData && (theBufferIndex < inBufferList.mNumberBuffers); ++theBufferIndex)
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{
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if(inBufferList.mBuffers[theBufferIndex].mData != NULL)
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{
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UInt32* theBuffer = (UInt32*)inBufferList.mBuffers[theBufferIndex].mData;
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UInt32 theNumberSamples = inBufferList.mBuffers[theBufferIndex].mDataByteSize / SizeOf32(UInt32);
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for(UInt32 theSampleIndex = 0; !hasData && (theSampleIndex < theNumberSamples); ++theSampleIndex)
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{
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hasData = theBuffer[theSampleIndex] != 0;
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}
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}
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}
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return hasData;
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}
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#if CoreAudio_Debug
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void CAAudioBufferList::PrintToLog(const AudioBufferList& inBufferList)
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{
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PrintInt(" Number streams: ", inBufferList.mNumberBuffers);
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for(UInt32 theIndex = 0; theIndex < inBufferList.mNumberBuffers; ++theIndex)
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{
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PrintIndexedInt(" Channels in stream", theIndex + 1, inBufferList.mBuffers[theIndex].mNumberChannels);
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PrintIndexedInt(" Buffer size of stream", theIndex + 1, inBufferList.mBuffers[theIndex].mDataByteSize);
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}
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}
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#endif
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const AudioBufferList* CAAudioBufferList::GetEmptyBufferList()
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{
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static bool sInitializer = false;
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static AudioBufferList sEmptyABL;
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if(!sInitializer)
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{
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memset(&sEmptyABL, 0, sizeof(AudioBufferList));
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}
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return &sEmptyABL;
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}
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