> Uh? PA supports surround sound just fine. Even does automatic upmixing/downmixing
> from/to stereo for you.
Sure, but doesn't transparently support the most common source/sink of surround sound: AC3
DVD audio to AC3 over SPDIF output.
If PA automatically supported AC3 encoding of surround sound to my SPDIF output, without
having to manually configure an external encoder program, that'd be good.
If PA could allow routing of AC3 audio through to the SPDIF port without the decoding/encoding
overhead and resultant quality degredation, that'd be great.
But, if it could do that, *and* transparently fall-over to doing a decode/mix/encode when it
needs to mix another stream into the output (e.g. an alert sound or what have you), it would be
an absolutely amazing achievement: that's something that you just can't do today. And I'd really
like to be able to do that.
Also, volume control is an interesting trick when not decoding the ac3 stream locally; I dunno
much about it, but I'm led to understand there's some metadata in the frames which can be set to
affect the volume on the decoder. Maybe (hand-wave) that could be modified in-flight without
re-encoding the stream. :) If PA could do that, that'd be even another advantage over the
existing ALSA solution.