[PATCH] winealsa: support up to 6 channels

[Andrew Eikum]

On Wed, Dec 31, 2014 at 02:01:36PM -0800, Chris Robinson wrote:
> On 12/31/2014 01:34 PM, Mark Harmstone wrote:
> >Needed for surround sound.
> 
> ALSA uses a different channel mapping for 5.1 than Windows. Windows wants:
> front-left, front-right, front-center, lfe, back-left*, back-right*
> while ALSA wants:
> front-left, front-right, back-left*, back-right*, front-center, lfe
> 
> So you can't just pass the samples through without swapping them.
> 

I believe winealsa already handles this, though I'd welcome a review.
See map_channels() in <dlls/winealsa.drv/mmdevdrv.c>:

http://source.winehq.org/git/wine.git/blob/6bab17313918ec21b196c7e465500f4c239caa5a:/dlls/winealsa.drv/mmdevdrv.c#l1169

I'd like to use the new ALSA channel mapping API at some point, but in
the meantime I think it's handled well enough.

Andrew