Adding to the subject :
I found on the web and in the source code of HDSPMixer 2 interesting things, namely:
- despite the effective 3x16 channels, it seems the internal channels might be 3x64, or at least 64 inputs, 64 outputs and ??? playback channels
- the source code shows a "playbacks_offset = 64" variable
I don't really see how to use these news as the code below doesn't work. (reminder : the goal is to connect playback channels 1&2 to outputs 7&8)

function set_gain () { amixer -c hw:0 cset numid=1 $1,$2,$3 > /dev/null 2>&1 }
function reset_matrix () {
        for out in $(seq 0 63); do
                for inp in $(seq 0 63); do
                set_gain $inp $out 0
                done
        done }
reset_matrix
#following lines tried 2 by 2 :
set_gain 0 6 65535    #doesn't work (I tried 0 and 1 inputs as there is sound there in graphical HDSPMixer vu-meter)
set_gain 1 7 65535    #doesn't work
set_gain 64 6 65535  #doesn't work (64 and 65 as 1st playback channels)
set_gain 65 7 65535  #doesn't work
set_gain 0 128 65535  #doesn't work
set_gain 1 129 65535  #doesn't work
set_gain 64 128 65535  #doesn't work
set_gain 65 129 65535  #doesn't work
exit 0

Any idea ?

Le 28/11/2016 à 13:00, linux-audio-user-request@lists.linuxaudio.org a écrit :