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

[Monkey Bizness]

So it appears my alsa configuration was messing things up a bit I
think, and as I have only one app using audio, there is only little
interest in not using the default pulse config...A parallel thread
regarding AEC points out to time scheduling issues on raspberry pi.
So I could make AEC work by:  - removing my alsa config and just
keeping the default pulse device - loading module-alsa-sink with
tsched=off - defining my echo-cancel  sink and source as default
Now the autoload creates an additional sink for the alsa device
alsa_output.platform-bcm2835_audio.stereo-fallback and sets it by as
the default sink, overwritting the default sink i defined in the
configuration.
How can i force pulse autoload to either not add that input device, or
not set it as default sink?
thanksMonkey
On Tue, 2020-05-19 at 13:00 +0200, Monkey Bizness wrote:
> 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
> 
> 
> 
> _______________________________________________pulseaudio-discuss
> mailing listpulseaudio-discuss at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss
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