ALSA (Advanced Linux Sound Architecture)

sudo modprobe snd_aloop
mpc add alsa://hw:1,1

audio_output {
    type            "httpd"
    name            "My HTTP Stream"
    encoder         "vorbis" # optional, vorbis or lame
    port            "8000"
    bind_to_address "192.168.1.38" # optional, IPv4 or IPv6
    quality         "5.0" # do not define if bitrate is d$

    # bitrate "128" # do not define if quality is d$

    format          "44100:16:1"
    max_clients     "0"                     # optional 0=no limit

}

aplay -l

--device /dev/snd