hi, I know this feels like an FAQ, I've consulted multiple places from http://alsa.opensrc.org/Asoundrc http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html http://nairobi-embedded.org/alsa_route_and_volume_plugin.html to no avail. I am working with an I2S based hat for the raspberry pi. Due to the protocol the chip always plays/record stereo. Now I'd like to configure alsa in a way to just simply duplicate channels when playing a mono file. My current asoundrc is below. The main issue is that I still can't play mono files. Playing WAVE '/tmp/tmpel6bu774.wav' : Signed 16 bit Little Endian, Rate 22050 Hz, Mono aplay: set_params:1297: Unable to install hw params: ACCESS: RW_INTERLEAVED FORMAT: S16_LE SUBFORMAT: STD SAMPLE_BITS: 16 FRAME_BITS: 16 CHANNELS: 1 RATE: 22050 ... It still tries to configure the hw as mono, but the hw can't do that. Next issue is how would I configure separate ttables depening on the number of input channels. Especially on http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html the docs are super lacking (eg. what does cchannel stands for?) Stefan // .asoundrc defaults.pcm.card 0 defaults.ctl.card 0 pcm.!default { type plug slave { pcm "hw:0" channels 2 } ttable { # mono 0.0 1 0.1 1 # stereo #0.0 1 #1.1 1 } } ctl.!default { type plug channels 1 slave { pcm "hw:0" } ttable { 0.0 1 1.0 0 } } ------------------------------------------------------------------------------ Developer Access Program for Intel Xeon Phi Processors Access to Intel Xeon Phi processor-based developer platforms. With one year of Intel Parallel Studio XE. Training and support from Colfax. Order your platform today. http://sdm.link/xeonphi _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
