[alsa-devel] ALSA 1.0.25 broke AC3 passthrough?

Jean-Yves Avenard jyavenard at gmail.com
Mon Feb 6 13:38:42 CET 2012


Today, I installed 1.0.25 drivers and libraries...
AC3 passthrough is completely broken.

My hardware: NVidia GT430, hdmi output
Device used:
on Ubuntu 10.04 LTS (but using manually built alsa)

It makes the application hangs or behaves incorrectly. All the time
broken, no matter which app.
Reverting back to 1.0.24 fixes the problem

I haven't delved much into it yet,
MythTV (I am the audio developer) after opening the audio device in
passthrough mode, trying to write audio on the pcm just hangs and
result in an I/O error after a little while
snd_pcm_writei returns an error (not immediately)
snd_pcm_state(pcm_handle) returns 3, snd_strerror(err) returns
"Input/output error"

mplayer just hangs...

nothing obvious in the logs, audio device opens okay, i can't say I
notice much difference in opening the device, allocating fragment and
the lot.

Anyone else has seen this?


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