On Fri, 16 Mar 2012, Mark Bishop wrote: > This works: > > root:/> arecord -Dhw:0 -d 10 -t wav -r 48000 -f S16_LE -c 2 test.wav > > > This doesn't: > root:/> arecord -Dhw:0 -d 10 -t wav -r 44100 -f S16_LE -c 2 test.wav So, I guess you record at 48000. Some sound cards can only record at one or the other frequency. Now you can get alsa to resample in software, or run it through Sox to resample in software. That always introduces extra noise and distortion. If you have a really good (read slow) method, that can be very small. If you have a bad (eg fast-- eg linear interpolation) it can introduce much more noise/distortion. See my tests of the sox resampling algorithms. www.theory.physics.ubc.ca/soundcard/resample.html > Recording WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo > asoc: can't set codec ssm2602-hifi hw params > arecord: set_params:1123: Unable to install hw params: > ACCESS: RW_INTERLEAVED > FORMAT: S16_LE > SUBFORMAT: STD > SAMPLE_BITS: 16 > FRAME_BITS: 32 > CHANNELS: 2 > RATE: 44100 > PERIOD_TIME: (125011 125012) > PERIOD_SIZE: 5513 > PERIOD_BYTES: 22052 > PERIODS: 4 > BUFFER_TIME: (500045 500046) > BUFFER_SIZE: 22052 > BUFFER_BYTES: 88208 > TICK_TIME: 0 > > I am not sure exactly what is wrong, I do the same thing on a AD1890 > codec and I get this: > root:~> arecord -Dhw:0 -d 10 -t wav -r 41000 -f S16_LE -c 2 test.wav > Recording WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 41000 Hz, Stereo > Warning: rate is not accurate (requested = 41000Hz, got = 48000Hz) > please, try the plug plugin > > but it still continues to record. This might not even be a problem, > but I am trying to debug why portaudio works good on the AD1980 codec > and blows chunks on the SSM2603 with the same portaudio lib (slightly > different ALSA lib, the SSM2603 is 1.0.24 and the AD1980 is 1.0.18) > and same app code. > > There is a different ALSA config for each codec but I'm having to > learn how the config reads. I could use some help here. > ------------------------------------------------------------------------------ This SF email is sponsosred by: Try Windows Azure free for 90 days Click Here http://p.sf.net/sfu/sfd2d-msazure _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
