Can an AudioConverter decode AAC-mono to lpcm-stereo or Apple
Lossless-mono to lpcm-stereo?
No. AudioConverters don't mix.
I am able to decode *all* other audio formats to lpcm stereo
correctly by using a channel map.
I don't see how this could be true. If you're using a channel map,
you're likely replicating one channel of input to two channels of
output (and now the result is too loud), or dropping one channel of
input when going stereo->mono.
If you're going stereo->mono or mono->stereo, you really need to
perform a mix yourself, use a mixer audio unit, or use something like
QuickTime's SCAudio component, which has the same interface as
AudioConverterFillComplexBuffer (see SCAudioFillBuffer in
QuickTimeComponents.h), but _does_ perform a mix for you.
-Brad Ford
QuickTime Engineering
It seems as if the AAC and ALAC converters are not respecting the
channel map at all.
Setting the map on the AAC converter does not return an error.
While debugging this, I also ask the converter for the channel map
right after I set it and everything appears correct. Both output
channels are mapped to channel 0.
Thanks.
Dominic Feira / Code Monkey / Ambrosia Software, Inc.
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