At Mon, 27 May 2002 18:37:09 +0200 (CEST), tomasz motylewski wrote: > > Now I have got all alsa9 utilites on the system and the driver does something. > > I can see for example PCM (2 channels) and PCM 1 (2 channels) in alsamixer. > > I can also record like: arecord -c 4 -t raw -f S16_LE aaa.raw > and I get: > od -i aaa.raw | more > 0000000 -10 -6 0 0 1 3 0 0 > 0000020 -8 -8 0 0 -7 -7 0 0 > 0000040 -7 -6 0 0 -6 -2 0 0 > 0000060 -10 -9 0 0 -9 -8 0 0 > > But here is a problem - I would expect to see some noise in both codecs - I > have configured and unmuted them BOTH to max volume. > > In fact I have tried also -c 3 and -c 5 and always only the first 2 channels > are non-zero. > > arecord -l > card 0: card0 [Cirrus Logic CS4281], device 0: CS4281 [CS4281] > Subdevices: 1/1 > Subdevice #0: subdevice #0 > > How can I record data from the secondary codec? the patch i made was only for enabling the 2nd codec. it does nothing actually about playback/capture using the 2nd codec yet, so it's normal that you receive the result above. the multi-channel was _emulated_ in alsa-lib.
i've not read the spec of cs4281 precisely, but there must be setting to specify which codec is used for playback/capture. sorry, i have no time atm for digging more about this. do you have clue about this? anyway, what we need to do on the driver are: - increase the number of channels for pcm playback/capture, or create the second pcm stream for 2nd codec. - set up the codec in prepare(), hw_params() or open() callback. disable in close() if necessary. please check other hardwares with double codecs. > > BTW. I have done: ... > > I believe this is a nice way to give the actual codec ID (0 is always the > primary codec). yes. but the exactly same hack was already on cvs at last week ;) Takashi _______________________________________________________________ Don't miss the 2002 Sprint PCS Application Developer's Conference August 25-28 in Las Vegas -- http://devcon.sprintpcs.com/adp/index.cfm _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
