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kAudioFormatFlagsAudioUnitCanonical

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kAudioFormatFlagsAudioUnitCanonical

Subject: kAudioFormatFlagsAudioUnitCanonical
From: Chris Adamson <email@hidden>
Date: Thu, 26 Feb 2009 14:40:04 -0500

So, the format of kAudioFormatFlagsAudioUnitCanonical is 8.24 fixed point (mentioned in some doc, as well as in CoreAudioTypes.h).

Pardon the "still getting my C sensibilities back" question, but are there any utilities in the iPhone SDK for working with 8.24 fixed, like the Fixed data type or FloatToFixed function from the Mac SDK? There's a AudioUnitSampleType in CoreAudioTypes.h, but it's just defined as SFloat32. Do I need to plan on doing my own bit-shifting? So far, I'm generating square waves by setting the high eight bits of each sample to either 0x80 to 0x00.

Having brought it up, is it genuinely advantageous to use the AU canonical format for synthesized audio, or is it just as well to use something simpler, like 16-bit ints? I know Jens made this point a few weeks back: <http://lists.apple.com/archives/coreaudio-api/2009/Feb/msg00263.html>

--Chris

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