Re: ExtAudioFile questions
Re: ExtAudioFile questions
- Subject: Re: ExtAudioFile questions
- From: William Stewart <email@hidden>
- Date: Wed, 23 May 2007 15:12:54 -0700
There's no mixing - we do have channel mapping through the audio
converter's channel map property (you can get the audio converter
from the ExtAF object)
Bill
On 22/05/2007, at 11:35 AM, Mark Pauley wrote:
In my experience, the channels are not mixed, though the minimal
contract has been upheld: I convert a mono-aif file to two channel
LPCM and find that one of the channels is blank. I think you've
got to manually add a mixer unit into the graph to get what I would
consider proper conversion of formats with differing channels per
frame.
_Mark
On May 22, 2007, at 8:32 AM, Sophia Poirier [dfx] wrote:
Will the ExtAudioFile / AudioConverter API convert between stream
formats with different numbers of channels? In other words, if I
ExtAudioFileOpen() a file, and then set the
kExtAudioFileProperty_ClientDataFormat property with an
AudioStreamBasicDescription.mChannelsPerFrame value different than
that in the kExtAudioFileProperty_FileDataFormat property's value,
will then calling ExtAudioFileRead() successfully convert up to
more channels or down to fewer channels in the output buffers, or
does this not work?
Also, I remember a while back there being a series of emails from
Brian Whitman about the AudioFile API crashing when encountering
certain malformed (but common) AIFF files. Was this ever fixed?
If so, in which version of Mac OS X?
thanks,
Sophia
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