[pulseaudio-discuss] {PATCH][RFC] AC3 passthrough support

[Michael Rans]

My default.pa line has rate set at 48000 which I guess would take precedence: 
load-module module-alsa-sink device=Filter_RateConvert rate=48000 
sink_properties=device.description=SPDIF sink_name=SPDIF)

But just in case, I tried changing default-sample-rate = 48000 in daemon.conf.

The error I got was:

D: alsa-sink.c: snd_pcm_mmap_commit: Resource temporarily unavailable
E: alsa-sink.c: Assertion 'err != -11' failed at modules/alsa/alsa-sink.c:395, 
function try_recover(). Aborting.

BTW, I got the setup using a rate converter from here: 
http://www.johannes-bauer.com/linux/dolby/?menuid=3 where this chap says "# Rate 
Converter to 48kHz, needed for some applications" in his advanced set up. He 
didn't mention Pulseaudio, but it seems to do the trick.

Regarding AC3 encoding in Pulseaudio - it would be better because at the moment 
switching between stereo and A52 is not possible (ie. I cannot have both these 
lines in default.pa:
load-module module-alsa-sink device=Filter_RateConvert rate=48000 
sink_properties=device.description=AC3 sink_name=AC3
load-module module-alsa-sink device=ALC889A_Digital 
sink_properties=device.description=SPDIF sink_name=SPDIF

Presumably the SPDIF out is locked by one of them, then the other fails. With 
ac3 encoding in Pulseaudio, this would be switchable without editing any files.

Cheers,
Mike






________________________________
From: pl bossart <bossart.nospam at gmail.com>
To: General PulseAudio Discussion <pulseaudio-discuss at mail.0pointer.de>
Sent: Sat, 10 July, 2010 16:12:26
Subject: Re: [pulseaudio-discuss] {PATCH][RFC] AC3 passthrough support

> But I still need to go via the rate converter to the a52 encoder in
> asoundrc.

Have you set the default sink frequency to 48kHz in
/usr/etc/pulse/daemon.conf? This should handle resampling in
PulseAudio.
Still not clear why rewind doesn't work.
- Pierre
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