On Tue, 2007-09-04 08:56:22 +0200, Clemens Ladisch <cladisch@xxxxxxxxxxxxxx> wrote:
> Jan-Benedict Glaw wrote:
> > On Thu, 2007-08-30 23:43:26 +0200, Jan-Benedict Glaw <jbglaw@xxxxxxxxxx> wrote:
> > > [...]
> > > After the FLAC ended, I fired up speaker-test again (and of course
> > > switched off "Four Channel Mode".) This time, it's different than
> > > before: front center/LFE, front left/right and side left/right are
> > > okay, but rear right/left are highly distorted.
>
> I can reproduce this.
>
> > Register 0x04
> > ~~~~~~~~~~~~~
> > Before: 0x07 << CM_ASFC_SHIFT | 0x00 << CM_DSFC_SHIFT | CM_BREQ
> > After: 0x07 << CM_ASFC_SHIFT | 0x07 << CM_DSFC_SHIFT | CM_BREQ
> >
> > (DAC Sample Frequency changed)
>
> 0 is the power-on default of 5512 Hz, 7 is 48 kHz.
> "DAC" and "ADC" aren't quite the correct names, both DMA channels can
> be used for either playback and capture, and the driver uses one for
> stereo and the other for multichannel playback.
>
> Does the FLAC file have a sample rate of 44.1 kHz or 48 kHz?
44.1kHz:
$ sndfile-info 04_my_immortal.flac
Version : libsndfile-1.0.17
========================================
File : 04_my_immortal.flac
Length : 28262646
----------------------------------------
Sample Rate : 44100
Frames : 11651808
Channels : 2
Format : 0x00170002
Sections : 1
Seekable : TRUE
Duration : 00:04:24.213
Signal Max : 31624 (-0.31 dB)
> > Register 0x18
> > ~~~~~~~~~~~~~
> > Before: CM_TXVX | CM_FM_EN | CM_AC3EN2 | CM_VIDWPPRT | CM_ENCENTER | CM_FLINKOFF
> > After: CM_TXVX | CM_FM_EN | CM_AC3EN2 | CM_VIDWPPRT | CM_SPDF_AC97 | CM_ENCENTER | CM_FLINKOFF
> >
> > (SPDIF/Out changed from 44.1kHz to 48kHz)
> >
> > My guess is that the change to SPDIF/Out frequency and DAC Sample
> > Frequency are annoying at best, but irrelevant here. Am I probably
> > right that the changed ch0 format is the cause of the distortion?
>
> I think it's the sample rate.
>
> It seems I can 'cure' the distortion by playing a 48 kHz file before
> running speaker-test. Can you confirm this?
After alsaplayer'ing one of the 48kHz files that speaker-test uses
with `-t wav', speaker-test also works as expected. Confirmed.
MfG, JBG
--
Jan-Benedict Glaw jbglaw@xxxxxxxxxx +49-172-7608481
Signature of: Alles sollte so einfach wie möglich gemacht sein.
the second : Aber nicht einfacher. (Einstein)
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