On Thursday 15 November 2007 04:45:22 gnittor@xxxxxxxxxxx wrote:
> hello,
> What is the best way to use this card, for single application at a time
> operation, without resampling? I am interested in best quality as I want to
> only use this card for music. software mixing is not important (i plan to
> use another soundcard as the default). Sampling rate should depend on the
> audio source.
>
> MAudio Revolution 7.1
> linux 2.6.23-rt1 #1 PREEMPT RT
> alsa 1.0.14
> debian unstable
>
> what i've done so far:
>
> - using it as default seems to work ok in every app (sw mixing ok) but
> plays at 48khz, while 44.1khz audio sounds slower than original
In alsamixer you need to unlock Multi Track Rate Locking. This will allow the
hardware to set it's bit rate based on the input source. This is a common
issue with the Revo 5.1 and 7.1 and there was a thread about this about two
weeks ago.
> cat
> /proc/asound/card0/pcm0p/sub0/hw_params
> access: MMAP_INTERLEAVED
> format: S32_LE
> subformat: STD
> channels: 2
> rate: 48000 (48000/1)
> period_size: 1024
> buffer_size: 16384
> tick_time: 1000
>
>
> - using hw:0,0 does not seem to work in any application. i get device busy.
> (also for hw:0,1 and hw:0,2)
>
>
> - using plughw:Revolution71 in audacious works fine, but the value of
> period_size looks odd cat /proc/asound/card0/pcm0p/sub0/hw_params
> access: MMAP_INTERLEAVED
> format: S32_LE
> subformat: STD
> channels: 2
> rate: 44100 (44100/1)
> period_size: 4412
> buffer_size: 22052
> tick_time: 1000
>
>
> - using plughw:Revolution71 in xine produces crackles (stops every 1-2 sec
> for a little) cat /proc/asound/card0/pcm0p/sub0/hw_params
> access: MMAP_INTERLEAVED
> format: S32_LE
> subformat: STD
> channels: 2
> rate: 44100 (44100/1)
> period_size: 4096
> buffer_size: 32768
> tick_time: 1000
>
>
> - using xine & jack (at 44100) produces crackles (no matter what settings
> for frames/period & periods/buffer i've tried) cat
> /proc/asound/card0/pcm0p/sub0/hw_params
> access: MMAP_INTERLEAVED
> format: S32_LE
> subformat: STD
> channels: 8
> rate: 44100 (44100/1)
> period_size: 16
> buffer_size: 96
> tick_time: 1000
>
>
> - using xine & jack (at 48khz) no crackles but sounds slow (using either
> audacious or xine) cat /proc/asound/card0/pcm0p/sub0/hw_params
> access: MMAP_INTERLEAVED
> format: S32_LE
> subformat: STD
> channels: 8
> rate: 44100 (44100/1)
> period_size: 16
> buffer_size: 96
> tick_time: 1000
>
>
>
> The problem is with 44.1 audio and xine. It seems that it is played without
> crackles only with the card in 48khz but sounds slower.
>
>
> I have tried setting period_size and buffer_size in asoundrc (as this is
> the only difference I could find between xine and audacious playng using
> plughw:Revolution71) but with no success. Also the only way I could get a
> virtual device to work in asoundrc was using plughw as such:
>
> pcm.rev {
> type plug
> slave {
> pcm "plughw:Revolution71"
> format S32_LE
> }
> }
>
>
> Any help appreciated
>
>
>
>
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