apulse: Apulse fails when an application opens a specially configured record device

I have two audio devices. The first one is a builtin IntelHDA sound card and the second one is a USB microphone. This setup will only work if I have a specially crafted .asoundrc. Here it is:

pcm.logitech
{
    type hw
    card LogitechUSB
}

pcm.usb
{
    type dsnoop
    ipc_key 234884
    ipc_perm 0666
    ipc_gid audio
    slave {
        pcm logitech
    }
}

pcm.!default
{
    type asym
    playback.pcm
    {
        type plug
        slave.pcm "dmix"
    }
    capture.pcm
    {
        type plug
        slave.pcm "usb"
    }
}

This file makes my USB microphone the default recording device. The problem with this set up is that Skype record ~0.5 seconds of audio and then fails.

It can be easily reproduced this way. Run this command, it will work:

$ apulse ffmpeg -f pulse -i default /tmp/pulse.wav

Now run it again (it will ask to overwrite the existing file), and ffmpeg will stall after recording exactly 51,278 bytes of audio. It seems like apulse fails when a recording device is routed via dsnoop and it’s quickly reopened.

About this issue

Original URL
State: closed
Created 9 years ago
Comments: 36 (13 by maintainers)

Most upvoted comments

Configured dsnoop device like this, added period_size, period and buffer_size params:

pcm.asnoop { type dsnoop ipc_key 219346 slave { pcm “hw:Loopback,0,1” period_size 256 periods 16 buffer_size 16384 channels 2 } }

Now it works like a charm

ghost on Apr 23, 2016