Re: [Alsa-user] How to select different S/PDIFoutput ports on a SBLive!

[Jaroslav K. <pe...@su...>]

On Sat, 31 Aug 2002, Gerard Janssen wrote:

> Hi,
> 
> Some time ago, I posted a similar message, but I never got a reply.
> 
> The SBLive! card can support four SPDIF output channels, indicated as
> SPDIF#0 - 3, which are located on the 12 pins or the 40 pins external
> connector (depending on the type of card).
> When I play a file to "spdif" or "iec958:AES0=0x42,AES1 = 0x82,AES2 =
> 0x02,AES3 = 0x02", the signal is send to the SPDIF#1 output. When I use
> "front" or "center_lfe", I can get music out of SPDIF#0-3 depending on the
> ALSA-mixer settings, however, the way the settings have to be chosen is not
> straight forward (trial and error). So apparently all SPDIF outputs are
> "available".
> 
> I would like to select/address all four SPDIF outputs of the SBLive! card.
> Now I have the following questions:
> 
> 1. How can the SPDIF output port be changed when using the "spdif" or
> "iec958" in the alsa player. I tried to change the channel value of AES2,
> but this had no effect at all.

It's not possible. Actually, DSP code supports optical and coaxial digital 
outs for LiveDrive, but I haven't information about physical connections 
for them by hand.

> 2. I tried to find the location where the SPDIF output port is set in the
> alsa code for the emu10k1. I also searched the emufx-code, since the spdif
> outputs come directly from the fx8010 processor, but I did not find it.
> Where is the SPDIF output port set? How can it be changed?

Look for EXTIN_TOSLINK_L and EXTIN_COAX_SPDIF_L in emufx.c

> B.t.w. I did find only three SPDIF channel status registers (SPCS0-2). Why
> are there only three SPCS's in stead of four?

I think that the emu10k1 chip shomehow merges signals from two S/PDIF 
inputs into one.

						Jaroslav

-----
Jaroslav Kysela <pe...@su...>
Linux Kernel Sound Maintainer
ALSA Project  http://www.alsa-project.org
SuSE Linux    http://www.suse.com