On Wed, 26 Nov 2003, Takashi Iwai wrote: >> On the same machine, alsa-driver-0.9.8 works fine, but not with 1.0.0pre1 >> and 1.0.0pre3. > what do you mean exactly "don't work" in the above? > the operation is blocked, or returns an error? > if it's blocked, check /proc/asound/card0/pcm0*/sub0/* files.
I think I found the problem. In 1.0.0preX, the supported sampling rate is limited to 48000Hz and this causes all kinds of problems if running with lower rates (I've mostly tested running at 8000Hz) - i.e. when using alsa-lib for sr-conversion. With 1.0.0pre3, for example "arecord -r 8000 - |aplay -r 8000 -" produces constant xruns. A similar app that relies on poll()/select(), fails even more severely. When looking at... /proc/asound/card0/pcm0p/sub0/hw_params and /proc/asound/card0/pcm0c/sub0/hw_params .. the rate is locked to 48000 with 1.0.0pre3. On the same machine with 0.9.8, the hw-rate is 8000. I've used the 'default' PCM device in all my tests. > does this laptop have multiple codecs? you can find them in > /proc/asound/card0/codec97#* directories. Nopes, '/proc/asound/card0/codec97#0/ac97#0-0' is the only one, and contains: --cut-- 0-0/0: Cirrus Logic CS4299 rev 6 Capabilities : -headphone out- DAC resolution : 20-bit ADC resolution : 18-bit 3D enhancement : Crystal Semi 3D Stereo Enhancement Current setup Mic gain : +0dB [+0dB] POP path : pre 3D Sim. stereo : off 3D enhancement : off Loudness : off Mono output : MIX Mic select : Mic1 ADC/DAC loopback : off Extended ID : codec=0 rev=0 AMAP DSA=0 VRA Extended status : VRA PCM front DAC : 48000Hz PCM ADC : 48000Hz SPDIF Control : Consumer PCM Category=0x2 Generation=1 Rate=48kHz --cut-- -- http://www.eca.cx Audio software for Linux! ------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. Does SourceForge.net help you be more productive? Does it help you create better code? SHARE THE LOVE, and help us help YOU! Click Here: http://sourceforge.net/donate/ _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
