UseAC-AF.cpp

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#if !defined(__COREAUDIO_USE_FLAT_INCLUDES__)
	#include <AudioToolbox/AudioToolbox.h>
	#include <CoreFoundation/CoreFoundation.h>
#else
	#include "AudioToolbox.h"
	#include "CoreFoundation.h"
#endif

#include "CAStreamBasicDescription.h"
#include "CAXException.h"


// a struct to hold info for the input data proc

struct AudioFileIO
{
	AudioFileID		afid;
	SInt64			pos;
	char *			srcBuffer;
	UInt32			srcBufferSize;
	CAStreamBasicDescription srcFormat;
	UInt32			srcSizePerPacket;
	UInt32			numPacketsPerRead;
	AudioStreamPacketDescription * pktDescs;
};

// input data proc callback

OSStatus EncoderDataProc(		AudioConverterRef				inAudioConverter, 
								UInt32*							ioNumberDataPackets,
								AudioBufferList*				ioData,
								AudioStreamPacketDescription**	outDataPacketDescription,
								void*							inUserData)
{
	AudioFileIO* afio = (AudioFileIO*)inUserData;
	
	// figure out how much to read
	if (*ioNumberDataPackets > afio->numPacketsPerRead) *ioNumberDataPackets = afio->numPacketsPerRead;

// read from the file

	UInt32 outNumBytes;
	OSStatus err = AudioFileReadPackets(afio->afid, false, &outNumBytes, afio->pktDescs, 
												afio->pos, ioNumberDataPackets, afio->srcBuffer);
	if (err) {
		printf ("Input Proc Read error: %d (%4.4s)\n", (int)err, (char*)&err);
		return err;
	}
	
//	printf ("Input Proc: Read %ld packets, size: %ld\n", *ioNumberDataPackets, afio->pos, outNumBytes);
	
// advance input file packet position

	afio->pos += *ioNumberDataPackets;

// put the data pointer into the buffer list

	ioData->mBuffers[0].mData = afio->srcBuffer;
	ioData->mBuffers[0].mDataByteSize = outNumBytes;
	ioData->mBuffers[0].mNumberChannels = afio->srcFormat.mChannelsPerFrame;

	if (outDataPacketDescription) {
		if (afio->pktDescs)
			*outDataPacketDescription = afio->pktDescs;
		else
			*outDataPacketDescription = NULL;
	}
		
	return err;
}

void	ReadCookie (AudioConverterRef converter, AudioFileID infile)
{
	// for decoding, grab the cookie from the file and write it to the converter
	UInt32 cookieSize = 0;
	OSStatus err = AudioFileGetPropertyInfo(infile, kAudioFilePropertyMagicCookieData, &cookieSize, NULL);
	// if there is an error here, then the format doesn't have a cookie, so on we go
	if (!err && cookieSize) {
		char* cookie = new char [cookieSize];
		
		err = AudioFileGetProperty(infile, kAudioFilePropertyMagicCookieData, &cookieSize, cookie);
		XThrowIfError (err, "Get Cookie From File");
		
		err = AudioConverterSetProperty (converter, kAudioConverterDecompressionMagicCookie, cookieSize, cookie);
		XThrowIfError (err, "Set Cookie To AudioConverter");
		
		delete [] cookie;
	}
}


void	WriteCookie (AudioConverterRef converter, AudioFileID outfile)
{
// grab the cookie from the converter and write it to the file
	UInt32 cookieSize = 0;
	OSStatus err = AudioConverterGetPropertyInfo(converter, kAudioConverterCompressionMagicCookie, &cookieSize, NULL);
		// if there is an error here, then the format doesn't have a cookie, so on we go
	if (!err && cookieSize) {
		char* cookie = new char [cookieSize];
		
		err = AudioConverterGetProperty(converter, kAudioConverterCompressionMagicCookie, &cookieSize, cookie);
		XThrowIfError (err, "Get Cookie From AudioConverter");
	
		/*err =*/ AudioFileSetProperty (outfile, kAudioFilePropertyMagicCookieData, cookieSize, cookie);
		// even though some formats have cookies, some files don't take them, so we ignore the error
		delete [] cookie;
	}
}

int ConvertFile (CFURLRef					inputFileURL, 
				CAStreamBasicDescription	&inputFormat,
				CFURLRef					outputFileURL,
				AudioFileTypeID				outputFileType, 
				CAStreamBasicDescription	&outputFormat,
				UInt32                      outputBitRate)
{
	AudioFileID infile, outfile;
	
	OSStatus err = AudioFileOpenURL(inputFileURL, kAudioFileReadPermission, 0, &infile);
	XThrowIfError (err, "AudioFileOpen");
		
	// create the AudioConverter
	AudioConverterRef converter;
	err = AudioConverterNew(&inputFormat, &outputFormat, &converter);
	XThrowIfError (err, "AudioConverterNew");

	ReadCookie (converter, infile);
	
	// get the actual output format
	UInt32 size = sizeof(inputFormat);
	err = AudioConverterGetProperty(converter, kAudioConverterCurrentInputStreamDescription, &size, &inputFormat);
	XThrowIfError (err, "get kAudioConverterCurrentInputStreamDescription");

	size = sizeof(outputFormat);
	err = AudioConverterGetProperty(converter, kAudioConverterCurrentOutputStreamDescription, &size, &outputFormat);
	XThrowIfError (err, "get kAudioConverterCurrentOutputStreamDescription");

    if( outputBitRate > 0 ) {
        printf ("Dest bit rate: %d\n", (int)outputBitRate);
        err = AudioConverterSetProperty(converter, kAudioConverterEncodeBitRate, 
                                        sizeof(outputBitRate), &outputBitRate);
        XThrowIfError (err, "AudioConverterSetProperty, kAudioConverterEncodeBitRate");
	}

	// create the output file (this will erase an existing file)
	err = AudioFileCreateWithURL(outputFileURL, outputFileType, &outputFormat, kAudioFileFlags_EraseFile, &outfile);
	XThrowIfError (err, "AudioFileCreate");
	
	// mActualToBaseSampleRateRatio is just for aach, since aach has two layers
	// the basic aac layer is of half sample rate of the aach layer
	double mActualToBaseSampleRateRatio = 1.0; // for aach
	CAStreamBasicDescription baseFormat;
	UInt32 propertySize = sizeof(AudioStreamBasicDescription);
	AudioFileGetProperty(infile, kAudioFilePropertyDataFormat, &propertySize, &baseFormat);
	
	if (inputFormat.mSampleRate != baseFormat.mSampleRate && inputFormat.mSampleRate != 0. && baseFormat.mSampleRate != 0.)
		mActualToBaseSampleRateRatio = inputFormat.mSampleRate / baseFormat.mSampleRate; // should be 2.0 for aach
	else
		mActualToBaseSampleRateRatio = 1.0;
	
	double srcRatio;
	if (outputFormat.mSampleRate != 0 && inputFormat.mSampleRate != 0) {
		srcRatio = outputFormat.mSampleRate / inputFormat.mSampleRate;
	} else {
		srcRatio = 1.0;
	}
	
	// if the bitstream file contains priming info, overwrite the audio converter's
	// priming info with the one got from the bitstream to do correct trimming
	SInt64 mDecodeValidFrames = 0;
	AudioFilePacketTableInfo srcPti;
	if (inputFormat.mBitsPerChannel == 0) { // input is compressed, decode to linear PCM
		size = sizeof(srcPti);
		err = AudioFileGetProperty(infile, kAudioFilePropertyPacketTableInfo, &size, &srcPti); // try to get priming info from bitstream file
		if (err == noErr) { // has priming info
			mDecodeValidFrames = (SInt64)(mActualToBaseSampleRateRatio * srcRatio * srcPti.mNumberValidFrames + 0.5);

			AudioConverterPrimeInfo primeInfo; // overwrite audio converter's priming info
			primeInfo.leadingFrames = (SInt32)(srcPti.mPrimingFrames * mActualToBaseSampleRateRatio + 0.5); // overwrite the audio converter's prime info
			primeInfo.trailingFrames = 0; // since the audio converter does not cut off trailing zeros
			err = AudioConverterSetProperty(converter, kAudioConverterPrimeInfo, sizeof(primeInfo), &primeInfo);
			XThrowIfError (err, "AudioConverterSetProperty, kAudioConverterPrimeInfo");
		}
	}
	
	// set up buffers and data proc info struct
	AudioFileIO afio;
	afio.afid = infile;
	afio.srcBufferSize = 32768;
	afio.srcBuffer = new char [ afio.srcBufferSize ];
	afio.pos = 0;
	afio.srcFormat = inputFormat;
		
	if (inputFormat.mBytesPerPacket == 0) {
		// format is VBR, so we need to get max size per packet
		size = sizeof(afio.srcSizePerPacket);
		err = AudioFileGetProperty(infile, kAudioFilePropertyPacketSizeUpperBound, &size, &afio.srcSizePerPacket);
		XThrowIfError (err, "kAudioFilePropertyPacketSizeUpperBound");
		afio.numPacketsPerRead = afio.srcBufferSize / afio.srcSizePerPacket;
		afio.pktDescs = new AudioStreamPacketDescription [afio.numPacketsPerRead];
	}
	else {
		afio.srcSizePerPacket = inputFormat.mBytesPerPacket;
		afio.numPacketsPerRead = afio.srcBufferSize / afio.srcSizePerPacket;
		afio.pktDescs = NULL;
	}

	// set up our output buffers
	AudioStreamPacketDescription* outputPktDescs = NULL;
	int outputSizePerPacket = outputFormat.mBytesPerPacket; // this will be non-zero if the format is CBR
	UInt32 theOutputBufSize = 32768;
	char* outputBuffer = new char[theOutputBufSize];
	
	if (outputSizePerPacket == 0) {
		UInt32 size = sizeof(outputSizePerPacket);
		err = AudioConverterGetProperty(converter, kAudioConverterPropertyMaximumOutputPacketSize, &size, &outputSizePerPacket);
		XThrowIfError (err, "Get Max Packet Size");
					
		outputPktDescs = new AudioStreamPacketDescription [theOutputBufSize / outputSizePerPacket];
	}
	UInt32 numOutputPackets = theOutputBufSize / outputSizePerPacket;

	WriteCookie (converter, outfile);
	
	// write dest channel layout
	if (inputFormat.mChannelsPerFrame > 2) {
		UInt32 layoutSize = 0;
		bool layoutFromConverter = true;
		err = AudioConverterGetPropertyInfo(converter, kAudioConverterOutputChannelLayout, &layoutSize, NULL);
			
			// if the converter doesn't have a layout does the input file?
		if (err || !layoutSize) {
			err = AudioFileGetPropertyInfo (infile, kAudioFilePropertyChannelLayout, &layoutSize, NULL);
			layoutFromConverter = false;
		}
		
		if (!err && layoutSize) {
			char* layout = new char[layoutSize];
			
			if (layoutFromConverter) {
				err = AudioConverterGetProperty(converter, kAudioConverterOutputChannelLayout, &layoutSize, layout);
				XThrowIfError (err, "Get Layout From AudioConverter");
			} else {
				err = AudioFileGetProperty(infile, kAudioFilePropertyChannelLayout, &layoutSize, layout);
				XThrowIfError (err, "Get Layout From AudioFile");
			}
			
			err = AudioFileSetProperty (outfile, kAudioFilePropertyChannelLayout, layoutSize, layout);
				// even though some formats have layouts, some files don't take them
			if (!err)
				printf ("write channel layout to file: %d\n", (int)layoutSize);
			
			delete [] layout;
		}
	}
	
	// loop to convert data
	SInt64 outputPos = 0;
	
	while (1) {

		// set up output buffer list
		AudioBufferList fillBufList;
		fillBufList.mNumberBuffers = 1;
		fillBufList.mBuffers[0].mNumberChannels = inputFormat.mChannelsPerFrame;
		fillBufList.mBuffers[0].mDataByteSize = theOutputBufSize;
		fillBufList.mBuffers[0].mData = outputBuffer;

		// convert data
		UInt32 ioOutputDataPackets = numOutputPackets;
		err = AudioConverterFillComplexBuffer(converter, EncoderDataProc, &afio, &ioOutputDataPackets, &fillBufList, outputPktDescs);
		XThrowIfError (err, "AudioConverterFillComplexBuffer");	
		if (ioOutputDataPackets == 0) {
			// this is the EOF conditon
			break;
		}
		
		SInt64 frame1 = outputPos + ioOutputDataPackets;
		if (mDecodeValidFrames != 0 && frame1 > mDecodeValidFrames) {
			SInt64 framesToTrim64 = frame1 - mDecodeValidFrames;
			UInt32 framesToTrim = (framesToTrim64 > ioOutputDataPackets) ? ioOutputDataPackets : UInt32(framesToTrim64);
			int bytesToTrim = framesToTrim * outputFormat.mBytesPerFrame;
			fillBufList.mBuffers[0].mDataByteSize -= bytesToTrim;
			ioOutputDataPackets -= framesToTrim;
		}
		
		// write to output file
		UInt32 inNumBytes = fillBufList.mBuffers[0].mDataByteSize;
		err = AudioFileWritePackets(outfile, false, inNumBytes, outputPktDescs, outputPos, &ioOutputDataPackets, outputBuffer);
		XThrowIfError (err, "AudioFileWritePackets");	
		
		// advance output file packet position
		outputPos += ioOutputDataPackets;

		// printf ("Convert Output: Write %ld packets, size: %ld\n", ioOutputDataPackets, inNumBytes);
	}

	// we write out any of the leading and trailing frames for compressed formats only	
	if (outputFormat.mBitsPerChannel == 0) {
		UInt32 isWritable;
		err = AudioFileGetPropertyInfo(outfile, kAudioFilePropertyPacketTableInfo, &size, &isWritable);
		if (err == noErr && isWritable) {
			// last job is to make sure we write out the priming and remainder details to the file
			AudioConverterPrimeInfo primeInfo;
			UInt32 primeSize = sizeof(primeInfo);
			
			err = AudioConverterGetProperty(converter, kAudioConverterPrimeInfo, &primeSize, &primeInfo);
			// if there's an error we don't care
			if (err == noErr) {
				AudioFilePacketTableInfo pti;
				size = sizeof(pti);
				err = AudioFileGetProperty(outfile, kAudioFilePropertyPacketTableInfo, &size, &pti);
				if (err == noErr) {
					// there's priming to write out to the file
					UInt64 totalFrames = pti.mNumberValidFrames + pti.mPrimingFrames + pti.mRemainderFrames; // get the total number of frames from the output file
					pti.mPrimingFrames = primeInfo.leadingFrames;
					pti.mRemainderFrames = primeInfo.trailingFrames;
					pti.mNumberValidFrames = totalFrames - pti.mPrimingFrames - pti.mRemainderFrames; // update number of valid frames
					err = AudioFileSetProperty(outfile, kAudioFilePropertyPacketTableInfo, sizeof(pti), &pti);
					XThrowIfError (err, "AudioFileSetProperty, kAudioFilePropertyPacketTableInfo");
				}
			}
		}
	}
	
	// write the cookie again - sometimes codecs will
	// update cookies at the end of a conversion
	WriteCookie (converter, outfile);

	// cleanup
	delete [] afio.srcBuffer;
	if (inputFormat.mBytesPerPacket == 0) {
		delete afio.pktDescs;
	}
	
	delete [] outputPktDescs;
	delete [] outputBuffer;

	AudioConverterDispose(converter);
	AudioFileClose(outfile);
	AudioFileClose(infile);
	
    return 0;
}