[pulseaudio-discuss] Emulate Alsa A52 plugin in pulseaudio ?

[Jim Duda]

I think I've learned that in order for a52encode to possibly work, I need to have /var/run/pulse/.asoundrc defined.

/var/run/pulse/.asoundrc:

pcm.a52encode {
     type a52
}

Yields:

lroom# /usr/bin/pulseaudio --system
E: module-alsa-sink.c: Error opening PCM device a52encode: Device or resource busy
E: module.c: Failed to load  module "module-alsa-sink" (argument: "sink_name=ac3_encode device=a52encode rate=48000 
channels=6"): initialization failed.
E: main.c: Module load failed.
E: main.c: failed to initialize daemon.

If I change a52encode to something else in the .asoundrc, I get:

E: module-alsa-sink.c: Error opening PCM device a52encode: No such file or directory
E: module.c: Failed to load  module "module-alsa-sink" (argument: "sink_name=ac3_encode device=a52encode rate=48000 
channels=6"): initialization failed.
E: main.c: Module load failed.
E: main.c: failed to initialize daemon.

So, apparently the .asoundrc in /var/run/pulse is recognized.

Using a52encode:0 results in:

lroom# /usr/bin/pulseaudio --system
ALSA lib conf.c:3949:(snd_config_expand) Unknown parameters 0
ALSA lib pcm.c:2144:(snd_pcm_open_noupdate) Unknown PCM a52encode:0
E: module-alsa-sink.c: Error opening PCM device a52encode:0: Invalid argument
E: module.c: Failed to load  module "module-alsa-sink" (argument: "sink_name=ac3_encode device=a52encode:0 rate=48000 
channels=6"): initialization failed.
E: main.c: Module load failed.
E: main.c: failed to initialize daemon.

Some permission problem maybe ....

Thanks for listening :-)

Jim


"Tanu Kaskinen" <tanuk at iki.fi> wrote in message news:20080229054425.GB12761 at a9a.mannikko1.tontut.fi...
> On Thu, Feb 28, 2008 at 09:36:20PM -0500, Jim Duda wrote:
>> Unfortunately, using a52encode as a device doesn't seem to work.  I
>> tried by a52encode and a52.
>>
>> lroom# /usr/bin/pulseaudio --system
>> ALSA lib control.c:909:(snd_ctl_open_noupdate) Invalid CTL surround51:0
>> W: alsa-util.c: Unable to attach to mixer surround51:0: No such file or
>> directory
>> ALSA lib pcm.c:2144:(snd_pcm_open_noupdate) Unknown PCM a52encode
>> E: module-alsa-sink.c: Error opening PCM device a52encode: No such file
>> or directory
>
> Which file doesn't exist?
> "strace -f pulseaudio --system > strace.out 2>&1" should
> give the answer. Before running that I'd check if changing
> a52encode:0 to just a52encode would help. The :0 part
> identifies the card and I think a52encode isn't associated
> with any specific card.
>
> Since I don't know much about the a52 plugin, I really am
> not sure that pulseaudio can use it at all.
>
> -- 
> Tanu Kaskinen