Re: Multi-channel audio
Re: Multi-channel audio
- Subject: Re: Multi-channel audio
- From: Joshua Tidsbury <email@hidden>
- Date: Thu, 9 Dec 2010 23:00:58 -0500
> If I play a DVD on Mac, 5.1 surround sound works fine.
This is because the DVD is encoded as Dolby Digital, which can be passed out via a 2ch optical connection into your receiver which then decodes the AC3 stream.
> I suspect mini-optical out only supports digital (S/PDIF) audio and
> not multi-channel (> 2) raw PCM. Is this correct?
Yes - but just to clarify your wording, a S/PDIF connection by design supports 2-ch PCM audio, or an encoded stream, but not more than 2 channels of PCM.
> If so, how to get multi-channel LPCM audio working with optical out
> using AudioQueueServices API?
You can't. I'm afraid you're trying to push a square peg through a round hole.
The only thing I could think of is if you licensed a real-time Dolby AC3 encoder, and incorporated that into your application. I'm not even sure this is feasible...
Otherwise, you're going to be looking at alternative audio interfaces in order to support multichannel audio output, at which point, it's really quite simple to manage.
Josh _______________________________________________
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