Re: How to put 16bit none audio PCM data stream into a 32bit none audio S/P-DIF transport stream?

[Takashi Iwai <tiwai@suse.de>]

At Tue, 08 Apr 2003 10:28:09 -0400,
Paul Davis wrote:
> 
> >I have an AC3 receiver which uses the bit flags of the S/P-DIF transport
> >stream for identifying none audio, and I use the cs46xx driver for my
> >Hercules Digifire 7.1 (under windows, using the included DVD player I
> >could have a real 5.1).
> >
> >Under linux using ALSA, all I get is a cliking sound... does anyone know
> >how I could solve this (without changing my hardware of course)?
> >
> >I have looked at the source, but it's far too complicated for me...
> 
> define a new plughw PCM device in ~/.asoundrc, and use
> that. unfortunately, i don't know how to do that, i just know that you
> can do it.

i'm afraid that it's not so easy as it sounds.  it strongly depends
on the hardware driver implementation...

about AC3, 32bit spdif is likely irrelevant.  A52 (AC3) is usally
packed into normal 16bit frames.

does the click happen even if you use alsa-tool's ac3dec?


Takashi


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