Converting multichannel file to stereo with down-mix.
Converting multichannel file to stereo with down-mix.
- Subject: Converting multichannel file to stereo with down-mix.
- From: email@hidden
- Date: Thu, 07 Jun 2012 21:45:28 -0400
Hi.
I'm trying to figure out how I can convert a multichannel (surround)
audio file to stereo using the ExtAudioFile and Audio Converter APIs.
I would like the stereo output file to be a fold-down mix of all the
channels, similar to what quicktime does. No matter what I try, the
resulting stereo file only has the first two channels of the source
file.
For example, I have a 6-channel AIF file whose channel layout is
kAudioChannelLayoutTag_MPEG_5_1_A (L R C LFE Ls Rs). I've tried
setting the ExtAudioFile's client and file channel layout... I've
tried setting the Audio Converter's input and output channel layout.
I always get only the L and R channels on the output. Is there any
possible way to do a fold-down mix using Core Audio?
Thanks.
Mark Verstraete
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