• tino
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Topic: Basic configuration for stereo playback via ALSA with AES-32 PCI card

Hi,

as a preparation for a more complex setup, I'm trying to get basic stereo playback to work using ALSA on a AES-32 card. I'm using the snd_hdspm driver and tried kernels 3.2, 3.3 and 3.6 on a PowerPC board and in a standard x86 PC.

Playback is broken due to regular audio skips of some tenth of a second. This results in too fast playback, if timing is not considered (when using aplay, mpg123, mplayer), or playback with short silence every few tenth of a second if playback timing is considered. I tried 44,1 kHz and 48 kHz samples without a notable difference.

When measuring the timing, 25% of the audio data seem to get lost.

Is this a known issue? How can I fix this?

  • tino
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Re: Basic configuration for stereo playback via ALSA with AES-32 PCI card

The 25% apply to playback with 44,1kHz. 33% get lost during playback of a 48 kHz stereo sample.

  • tino
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Re: Basic configuration for stereo playback via ALSA with AES-32 PCI card

Hi,

as nobody seems to have problems with that, what is the usual method to set up plain ALSA playback on an AES-32 PCI card in Linux? Did I miss some documentation?