Jeffrey Barish wrote: > Playing raw data '/dev/zero' : Signed 16 bit Little Endian, Rate 88200 Hz, Stereo > Warning: rate is not accurate (requested = 88200Hz, got = 96000Hz) > please, try the plug plugin > Hardware PCM card 0 'HDA Intel PCH' device 0 subdevice 0 > > When I try the command with plughw, I get > > aplay -D plughw:0 -t raw -f dat -r 88200 -d 3 -v /dev/zero > Playing raw data '/dev/zero' : Signed 16 bit Little Endian, Rate 88200 Hz, Stereo > Plug PCM: Rate conversion PCM (96000, sformat=S16_LE) > Converter: linear-interpolation > Slave: Hardware PCM card 0 'HDA Intel PCH' device 0 subdevice 0 > > If I have this right, when I use plughw, ALSA is performing the sample rate > conversion; Yes. > otherwise, it is the DAC itself. The DAC never converts the sample rate; it just runs at that rate. > When I specify any other sample rate, the sample rate of the DAC is the same > as the sample rate specified in the aplay command. Can I assume that ALSA is > doing nothing to the signal in those cases? Yes. > By the way, the DAC is Realtek ALC892. This chip supports 88.2 kHz only on the digital output. > When I run ALSA with plughw and ALSA invokes the sample-rate converter to go > from 88200 to 96000, I see from the output above that it uses linear > interpolation. Is there a way to specify a better algorithm? Install the alsa-plugins package. (Which might have been split into several package by your distribution.) Regards, Clemens ------------------------------------------------------------------------------ Is your legacy SCM system holding you back? Join Perforce May 7 to find out: • 3 signs your SCM is hindering your productivity • Requirements for releasing software faster • Expert tips and advice for migrating your SCM now http://p.sf.net/sfu/perforce _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
