I'm trying to make ALSA 1.0.23 to use different resampling algorithm. I did some research on the Internet and found that putting the line defaults.pcm.rate_converter "<library>"
into either /etc/asound.conf
or ~/.asoundrc
will tell ALSA to use different resampling algorithm.
However, it doesn't seem to work. Putting the following line into ~/.asoundrc defaults.pcm.rate_converter "speexrate_best"
doesn't have any effect on either CPU usage or the list of loaded libraries (doing lsof -n | grep speex
while playing something yields nothing). Although, the following snippet forces ALSA to use new resampling algorithm:
pcm.!default { type rate slave { pcm "hw:0,0" rate 48000 } converter "speexrate_best" }
Doing so makes CPU usage to 10-15% and makes two new shared libraries appear in the list of lsof
, but software mixing stops working and I can't play multiple audio files.
I'm probably missing something obvious. What can be an issue here?
Best Answer
Looks like mplayer was doing resampling all the way long. Playing some wav files with
aplay
shows that the new resampling algorithm is being used as intended.