At Tue, 29 Jan 2002 11:00:34 +0100, Christian Herzog wrote: > > Hi Takashi, > > please allow me to join the discussion. I have been following this > thread for about 3 weeks, and perhaps I can help a little to reduce > confusion. > I have an Asus A7V266-E mobo w/ C-Media 8738 sound onboard. The > soundchip is model number 055, according to alsa. I use an of-the-shelf > coax-to-optical converter to connect it to my Pioneer receiver. Ok, yours is also model 55.
> Situation: > > OSS: analog OK, spdif OK, but no AC3 passthru > > Alsa: analog OK, spdif NOT OK (the horrible signed/unsigned distortion > everybody else is experiencing), AC3 also distorted. The problem is not > the mixer: either there's no digital signal,or it's distorted. Did you experience I/O error during playback, too? If this happens, usually it means that interrupts are not correctly generated or the h/w configuration is not correct. > so far, I have found two solutions with varying success: > > - first one was proposed about one month ago on this list: in section > snd_cmipci_playback, change SNDRV_PCM_FMTBIT_S16_LE to U16_LE -> spdif > still distorted, but AC3 works (but it's choppy) > > - 2nd one: posted as a patch by Dean Townsley on 01/23 01:10. Please > refer to original message for explanations. Result: spdif works, AC3 > thru works (but again choppy), analog silent (as expected). > > I also tried the latest cvs after you told Thomas Tonino to do so > yesterday, but it's still distorted. Hmm.. did you try exchanging the channels? > so perhaps best would be to start with Dean's patch as it almost does > the job. analog should be easy, and the choppy AC3 could be something > else (I use xine, any idea how to tell mplayer to use hw:0,2 instead 0,0 > for AC3?) perhaps "-ao alsa9:hw:0,2" does. > If you need any help (register dumps..), please tell me. Yes, it'll really help. Could you get register dump in each case? (OSS, ALSA original, and one with Dean's patch) Takashi _______________________________________________ Alsa-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-user
