[alsa-devel] Surround and SPDIF on STAC9277

[Takashi Iwai]

At Sat, 24 May 2008 17:02:21 -0400,
Jon Smirl wrote:
> 
> I've figure out that the answer that I'm looking for is AC3 over SPDIF
> support. Now I'm trying to figure out how to make it work in pulse.

If you think of real-time conversion to AC3 from linear PCM streams, I
guess pulseaudio doesn't support it natively.


Takashi


> On 5/24/08, Jon Smirl <jonsmirl at gmail.com> wrote:
> > How are you supposed to get 5.1 audio out of your PC? When I hook the
> >  SPDIF device from my STAC9227/HDA audio up to pulse, pulse says that
> >  the SPDIF channel only supports stereo.
> >
> >  So I go digging around the in STAC9227 datasheet.
> >  http://www.idt.com/?genID=STAC9227
> >
> >  STAC9227 codec only supports 192Khz SPDIF with 4/1*48Khz channels. It
> >  doesn't support 384Khz with 8/1*48Khz channels.
> >
> >  So there are two problems, first the existing Intel HDA/STAC9227
> >  driver is not exposing the 4 channel SPDIF support. Or I can't figure
> >  out how to get to it.
> >
> >  Second, the hardware doesn't seem to support any way to get digital
> >  5.1 audio out of the codec and into my Sony amp. STAC9227 does have
> >  six channel analog out, but my Sony amp doesn't have 6 channel analog
> >  in. Sony amp supports 384Khz 8-channel SPDIF in.
> >
> >
> >  --
> >  Jon Smirl
> >  jonsmirl at gmail.com
> >
> 
> 
> -- 
> Jon Smirl
> jonsmirl at gmail.com
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