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Re: Deinterleave using ExtendedAudioFile

Subject: Re: Deinterleave using ExtendedAudioFile
From: Aulis Telle <email@hidden>
Date: Tue, 20 Mar 2007 17:30:39 +0100
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Delivered-to: email@hidden

but there is no obvious way to do it if I am using ExtendedAudioFile. In ExtendedAudiFile I can set Channel Layout tags - but they don't seem to help much.

You simply extract the underlying AudioConverter from the ExtendedAudioFile

UInt32 size = sizeof(AudioConverterRef); AudioConverterRef theConverter; ExtAudioFileGetProperty(myAudioFile, kExtAudioFileProperty_AudioConverter, &size, &theConverter);

Now you can set the channel map of the AudioConverter:

AudioConverterSetProperty(theConverter, kAudioConverterChannelMap,
    sizeof(channelMap), channelMap);

Be sure to also set kExtAudioFileProperty_ConverterConfig on the audio file afterwards to give it the chance to synchronize with the new settings (see documentation of kExtAudioFileProperty_AudioConverter for more details).

CFPropertyListRef config = NULL;
ExtAudioFileSetProperty (myAudioFile,
                                 kExtAudioFileProperty_ConverterConfig,
                                 sizeof (CFPropertyListRef),
                                 &config);

I hope that helps.

Aulis


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References:
	>Deinterleave using ExtendedAudioFile (From: David Paterson <email@hidden>)
	>Re: Deinterleave using ExtendedAudioFile (From: William Stewart <email@hidden>)
	>Re: Deinterleave using ExtendedAudioFile (From: David Paterson <email@hidden>)

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