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Format convertion

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Format convertion

Subject: Format convertion
From: "apple question" <email@hidden>
Date: Fri, 30 Jun 2006 14:14:05 -0800

Hi, I have a data stream of format KAudioFormatKLinearPCM collected from iSight. How do I convert it to KAudioFormatALaw then convert it back to KAudioFormatKLinearPCM ? I created a AudioConverter with input/output format defined as:

inDataFormat.mFormatID = kAudioFormatALaw; inDataFormat.mSampleRate = 48000.; inDataFormat.mFormatFlags = kAudioFormatFlagIsPacked | kAudioFormatFlagIsFloat | kAudioFormatFlagIsBigEndian; inDataFormat.mBytesPerPacket = 4; inDataFormat.mFramesPerPacket = 1; inDataFormat.mBytesPerFrame = 4; inDataFormat.mChannelsPerFrame = 1; inDataFormat.mBitsPerChannel = 32;


	outDataFormat = inDataFormat;
	outDataFormat.mFormatID = kAudioFormatLinearPCM;

I have no problem convert the stream to KAudioFormatALaw, but when I try to convert it back to Linear, it it crashes at AudioConverterFillComplexBuffer. Am I doing something wrong? What is the right way to do it?

Thanks,

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