On Sat, 2010-07-10 at 13:24 +, Michael Rans wrote:
I can't find any definition of snd_pcm_rewind() in the alsa-plugins
source code. Does this function call through to a function in the
plugins?
snd_pcm_rewind() is in alsa-lib, not alsa-plugins. I don't know how the
plugins do rewinding - I
On Sun, 2010-07-11 at 09:10 +0300, Tanu Kaskinen wrote:
On Sat, 2010-07-10 at 13:24 +, Michael Rans wrote:
I can't find any definition of snd_pcm_rewind() in the alsa-plugins
source code. Does this function call through to a function in the
plugins?
snd_pcm_rewind() is in alsa-lib,
At the moment I can switch between A52 and stereo SPDIF but it requires file
editing and restarting Pulseaudio.
1. I haven't tried the new profiles yet - does this mean with the profiles in a
GUI, I would be able to switch from A52 to stereo SPDIF output without editing
any files or
On Sun, 2010-07-11 at 08:43 +, Michael Rans wrote:
At the moment I can switch between A52 and stereo SPDIF but it
requires file editing and restarting Pulseaudio.
1. I haven't tried the new profiles yet - does this mean with the
profiles in a GUI, I would be able to switch from A52 to
That's the the problem - as you put it both sinks (spdif/stereo and spdif/a52)
can't exist at the same time.
If A52 encoding occurred in Pulseaudio, there would only be one sink, hence the
switch between stereo and A52 would be transparent and could occur even while
the music is playing (with
Regarding your patch, I tried it but I got a seg fault. I also tried:
size_t max_rewind = PA_MIN(u-hwbuf_size, snd_pcm_rewindable(u-pcm_handle));
pa_sink_set_max_rewind(u-sink, max_rewind);
But u-pcm_handle is not populated at that stage as far as I can tell.
On Sun, 2010-07-11 at 09:26 +, Michael Rans wrote:
That's the the problem - as you put it both sinks (spdif/stereo and
spdif/a52) can't exist at the same time.
If A52 encoding occurred in Pulseaudio, there would only be one sink,
hence the switch between stereo and A52 would be
Thanks for this detailed reply.
Would I be right in saying that for this to happen, you cannot define your own
sinks in default.pa using load-module module-alsa-sink ... but must use the
moduel detection?
Or can profiles be made to work with the load-module module-alsa-sink ... lines?
Cheers,
Further to my email below, I find that using udev detection and the change you
suggested to default.conf, I get resource busy - I don't think my card likes it
that it's SPDIF is opened twice, once as a stereo digital device and again
through A52:
E: alsa-util.c: snd_pcm_avail() returned a
Ah ok ignore that - I finally found what Colin's patch fixes :-) It is
specifically when using udev (not alsa module loading as I have been
previously)
that it has an effect ie. if you have:
load-module module-alsa-sink device=a52 rate=48000
sink_properties=device.description=a52 sink_name=a52
Finally I got it all working!
These are the steps on Ubuntu Lucid 10.04 LTS:
1. Open from Pulse source code: src/modules/alsa/alsa-sink.c
2. Replace: pa_sink_set_max_rewind(u-sink, u-hwbuf_size); with:
if(strcmp(u-device_name, a52) == 0) {
pa_sink_set_max_rewind(u-sink, 0);
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