[Alsa-user] Does the SpeexDSP plugin work?

[Stuart N. <stu...@ou...>]

I have been playing with this repo and the results are actually quite good.

https://github.com/voice-engine/ec

I have been using exactly the same parameters with the following.
# The IPC key of dmix or dsnoop plugin must be unique
# If 555555 or 666666 is used by other processes, use another one
# use samplerate to resample as speexdsp resample is bad
#defaults.pcm.rate_converter "samplerate"
pcm.!default {
    type asym
    playback.pcm "playback"
    capture.pcm "echo"
}

pcm.playback {
    type plug
    slave.pcm "dmixed"
}
pcm.echo {
type speex
slave.pcm "agc"
echo yes
frames 128
filter_length 4096
}
pcm.agc {
type speex
slave.pcm "capture"
agc 1
}
pcm.capture {
    type plug
    slave.pcm "array"
    route_policy sum
}
pcm.dmixed {
    type dmix
    slave.pcm "hw:seeed2micvoicec"
    ipc_key 555555
}
pcm.array {
    type dsnoop
    slave {
        pcm "hw:seeed2micvoicec"
        channels 2
    }
    ipc_key 666666
}

I really don’t understand how the above repo can do such and excellent job and then with alsa-plugins it can provide zero EC and also vocode the recording so badly?
Surely there is something wrong with the implementation?
Its doesn’t make and sense unless I have the above asound.conf wrong?
But https://github.com/voice-engine/ec works quite effectively?
Stuart

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From: Peter P.<mailto:pet...@fa...>
Sent: 21 April 2020 21:51
To: als...@li...<mailto:als...@li...>
Subject: Re: [Alsa-user] alsa-only applications (such as jitsi) via jackd

* Peter P. <pet...@fa...> [2020-04-21 20:20]:
> * Clemens Ladisch via Alsa-user <als...@li...> [2020-04-12 11:55]:
> > Peter P. wrote:
> > > Can I set pcm device names per application as defaults?
> >
> > If the application does not allow you to set the ALSA device name,
> > you have to replace the device definition that the application used
> > (probably "default").
> Thanks Clemens, just to make sure I get you right: Some applications do
> not allow me to set "PCM devices" but only cards? In that case I can
> only redefine default by changing/creating a .asoundrc?
>
> > It would be possible to create a device definition that reads an
> > environment variable (the "hw" device does this with ALSA_PCM_*),
> > but the "default" device does not do this.
> I am just making my way through alsa terminology, let me ask you if you
> mean a "PCM device" called hw, not the hw as a protocol for accessing
> cards?

I am replying to my last thread here to tell that I finally managed to
make a non-jackified application (jitsi meet application image in my
case) use jack. I did this by installing the libasound2-plugins Debian
package, which provides a jack plugin for alsa. Then I created an
.asoundrc with the below contents which points to the built-in soundcard
hw:0 as a default, but permits any environment variable (ALSAPP for me)
to change this assignment

        pcm.!default{
                type plug
                slave.pcm {
                        @func getenv
                        vars [ ALSAPP ]
                        default "hw:0"
                }
        }

With jackd running I can now start any application prefixed with that
variable pointing to the jack plugin
 $ ALSAPP=jack ffmuc-meet-x86_64.AppImage

If anyone sees something I could improve here I'd be glad to know.
Thanks for the help on this list!

cheers, P


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