[EMAIL PROTECTED] wrote: > >i.m using a winfast cm8738 sound card with digital addon board. >i.d like to use the digital output to pipe ac3 signals from the >dvb-s sat board to my dd receiver. > >i can.t playback clear sound thru the digital output >(eg. madplay /mp3/test.mp3). i have VERY bad high clipping >distortions. sound is good when connected thru the analog line >output. > I have the same problems with driver versions 0.0.9beta9 and 0.9.0beta10. The distortion is awful: it is caused by a signed/unsigned mixup and under the resulting schreeching sound, one can barely hear remains of the wanted output.
To fix this, I changed card-cmipci.c under static snd_pcm_hardware_t snd_cmipci_playback where it says formats: SNDRV_PCM_FMTBIT_S16_LE. iIf you change the S16 to U16, the digital out will be fine. BUT then the analog out has the same distortion you now have on digital. I assume this is because the driver then is fed unsigned data, which suits the digital out, but obviously messes up the analog. I've brought this up before on the list, but got no response - not from people with the same problem, nor from people using this succesfully. Maybe we both have a new chip revision that needs an extra bit fiddled? I hope my workaround helps you a bit, and I assume the same fix can be applied to the record side as well to fix recording. Still would be much happier if there was a real fix. Good luck, Thomas _______________________________________________ Alsa-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-user
