/* Copyright © 2010 Apple Inc. All Rights Reserved. |
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Disclaimer: IMPORTANT: This Apple software is supplied to you by |
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redistribution of this Apple software constitutes acceptance of these |
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install, modify or redistribute this Apple software. |
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In consideration of your agreement to abide by the following terms, and |
subject to these terms, Apple grants you a personal, non-exclusive |
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"Apple Software"), to use, reproduce, modify and redistribute the Apple |
Software, with or without modifications, in source and/or binary forms; |
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text and disclaimers in all such redistributions of the Apple Software. |
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may be used to endorse or promote products derived from the Apple |
Software without specific prior written permission from Apple. Except |
as expressly stated in this notice, no other rights or licenses, express |
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The Apple Software is provided by Apple on an "AS IS" basis. APPLE |
MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION |
THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS |
FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND |
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IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL |
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*/ |
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#if !defined(__COREAUDIO_USE_FLAT_INCLUDES__) |
#include <AudioToolbox/AudioToolbox.h> |
#else |
#include "AudioToolbox.h" |
#include "ExtendedAudioFile.h" |
#endif |
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#include "CAStreamBasicDescription.h" |
#include "CAXException.h" |
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const UInt32 kSrcBufSize = 32768; |
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int ConvertFile (CFURLRef inputFileURL, |
CAStreamBasicDescription &inputFormat, |
CFURLRef outputFileURL, |
AudioFileTypeID outputFileType, |
CAStreamBasicDescription &outputFormat, |
UInt32 outputBitRate) |
{ |
ExtAudioFileRef infile, outfile; |
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// first open the input file |
OSStatus err = ExtAudioFileOpenURL (inputFileURL, &infile); |
XThrowIfError (err, "ExtAudioFileOpen"); |
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// if outputBitRate is specified, this can change the sample rate of the output file |
// so we let this "take care of itself" |
if (outputBitRate) |
outputFormat.mSampleRate = 0.; |
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// create the output file (this will erase an exsiting file) |
err = ExtAudioFileCreateWithURL (outputFileURL, outputFileType, &outputFormat, NULL, kAudioFileFlags_EraseFile, &outfile); |
XThrowIfError (err, "ExtAudioFileCreateNew"); |
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// get and set the client format - it should be lpcm |
CAStreamBasicDescription clientFormat = (inputFormat.mFormatID == kAudioFormatLinearPCM ? inputFormat : outputFormat); |
UInt32 size = sizeof(clientFormat); |
err = ExtAudioFileSetProperty(infile, kExtAudioFileProperty_ClientDataFormat, size, &clientFormat); |
XThrowIfError (err, "ExtAudioFileSetProperty inFile, kExtAudioFileProperty_ClientDataFormat"); |
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size = sizeof(clientFormat); |
err = ExtAudioFileSetProperty(outfile, kExtAudioFileProperty_ClientDataFormat, size, &clientFormat); |
XThrowIfError (err, "ExtAudioFileSetProperty outFile, kExtAudioFileProperty_ClientDataFormat"); |
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if( outputBitRate > 0 ) { |
printf ("Dest bit rate: %d\n", (int)outputBitRate); |
AudioConverterRef outConverter; |
size = sizeof(outConverter); |
err = ExtAudioFileGetProperty(outfile, kExtAudioFileProperty_AudioConverter, &size, &outConverter); |
XThrowIfError (err, "ExtAudioFileGetProperty outFile, kExtAudioFileProperty_AudioConverter"); |
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err = AudioConverterSetProperty(outConverter, kAudioConverterEncodeBitRate, |
sizeof(outputBitRate), &outputBitRate); |
XThrowIfError (err, "AudioConverterSetProperty, kAudioConverterEncodeBitRate"); |
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// we have changed the converter, so we should do this in case |
// setting a converter property changes the converter used by ExtAF in some manner |
CFArrayRef config = NULL; |
err = ExtAudioFileSetProperty(outfile, kExtAudioFileProperty_ConverterConfig, sizeof(config), &config); |
XThrowIfError (err, "ExtAudioFileSetProperty outFile, kExtAudioFileProperty_ConverterConfig"); |
} |
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// set up buffers |
char srcBuffer[kSrcBufSize]; |
|
// do the read and write - the conversion is done on and by the write call |
while (1) |
{ |
AudioBufferList fillBufList; |
fillBufList.mNumberBuffers = 1; |
fillBufList.mBuffers[0].mNumberChannels = inputFormat.mChannelsPerFrame; |
fillBufList.mBuffers[0].mDataByteSize = kSrcBufSize; |
fillBufList.mBuffers[0].mData = srcBuffer; |
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// client format is always linear PCM - so here we determine how many frames of lpcm |
// we can read/write given our buffer size |
UInt32 numFrames = (kSrcBufSize / clientFormat.mBytesPerFrame); |
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// printf("test %d\n", numFrames); |
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err = ExtAudioFileRead (infile, &numFrames, &fillBufList); |
XThrowIfError (err, "ExtAudioFileRead"); |
if (!numFrames) { |
// this is our termination condition |
break; |
} |
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err = ExtAudioFileWrite(outfile, numFrames, &fillBufList); |
XThrowIfError (err, "ExtAudioFileWrite"); |
} |
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// close |
ExtAudioFileDispose(outfile); |
ExtAudioFileDispose(infile); |
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return 0; |
} |
