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mono channel to stereo channel mapping problem.

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mono channel to stereo channel mapping problem.

Subject: mono channel to stereo channel mapping problem.
From: Jong-young Park <email@hidden>
Date: Tue, 14 Jul 2009 09:44:09 +0900

Hello everyone.

I'm trying to make iPhone Apps(OS ver. 3.0) using AUGraph of Core Audio.

It's simply mixing two audio files using Audio unit.

Audio unit flow graph is,

ExtAudioFileOpenURL(voice) -

| - AUMixer(kAudioUnitSubType_MultiChannelMixer) - AUOutput(kAudioUnitSubType_RemoteIO)

ExtAudioFileOpenURL(music) -

It works good, but only problem is a single channel in voice file.

Music is ok, I can hear both left and right side well. (and music file is 2 channels).

But, I only can hear left side from voice file. (and voice file is 1 channel).

I want to hear voice file in both side, (so called mono to stereo in core audio mailing list.) but I can't find the solution.

I tried to use AUConverter, but it does not working with channelMap.

How to set ChannelMap to work mono -> stereo?

I need your help.

Thank you for reading.

-mocona-

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