[alsa-devel] Problems capturing and playback via the loopback device

Erik Kazandjian erik.kazandjian at gmail.com
Fri Jan 18 07:41:15 CET 2013


I'm new to alsa and I'm trying to do the following. I have configured my
rythm box to use the loopback device. I've written a little program to
capture everything that comes on the other side of the loopback and save
that into a file.
If I play a song on rythm box I see actual packets on the couterside of the
loopback however I save these packets in a file and try to play them back
using my sound card I hear no sound.
I use the following .asoundrc

    type hw
    card 1
    device 1
    subdevice 0

    type hw
    card 1
    device 0
    subdevice 0

pcm.play48 {
    type plug
    slave {
        pcm loopplayback
        rate 44100
    channels 2

attached is my test program to do the capturing. Anyone has any idea what
I'm doing wrong ?

Kind regards

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