[pulseaudio-discuss] pa echo-cancel module and alsa

[Monkey Bizness]

Hi,

I'm hoping someone here can help me figure out how to setup my
configuration properly.

I'm trying to output sound through the echo-cancel module but by going
through the alsa device. Unfortunately, the application doesn't support
pulseaudio for the playback.

configuration:
raspberry pi 4ubuntu 20.04
ffmpeg : 4.2.2-1ubuntu1
pulseaudio : 13.99.1-1ubuntu3.2




In order to do that, i've defined the echo-cancel configuration in
/etc/pulse/default.pa:load-module module-echo-cancel
use_master_format=1 aec_method=webrtc aec_args="analog_gain_control=0\
digital_gain_control=1" source_name="echoCancel_source"
sink_name="echoCancel_sink" 


It works. I can test it with :
ffmpeg -i recording.wav -f pulse -device echoCancel_sink test


Now in order to playback through alsa, i've defined a pcm device:
cat /etc/alsa/conf.d/90-echocancel.conf  
pcm.pulse-echo-cancel {

        type pulse

        device "echoCancel_sink"

}



ctl.pulse-echo-cancel {

        type pulse

        sink "echoCancel_sink"

}




When I try this configuration with:

ffmpeg -i recording.wav -f alsa pulse-echo-cancel



Sound is scrambled and super slow.


Does anyone know how to make this configuration work?
Any pointer would be appreciated.


I feel I got the correct overall approach but i am missing something
about the rate convertion or specification.


Best regards


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