mpd가 성공적인 ALSA 장치를 열 수 없습니다.

ALSA LADSPA 플러그인을 통해 온보드 사운드 하드웨어를 사용하여 Raspberry Pi/Raspbian wheeze 오디오 플레이어를 설정하여 오디오를 스테레오 다운믹스하고 압축하려고 합니다.

aplay, sox, mpg123, moc( cd ~/.moc && cp /usr/share/doc/moc/examples/config.example.gz ./ && gunzip config.example.gz && mv config.example config)는 다음 사용자 정의 "장치"를 사용합니다.

pi@raspberrypi ~ $ aplay -D mcl audiofile.wav
pi@raspberrypi ~ $ sox audiofile.wav -t alsa mcl
pi@raspberrypi ~ $ mpg123 -a mcl audiofile.mp3
pi@raspberrypi ~ $ speaker-test -t wav -c 2
pi@raspberrypi ~ $ speaker-test -t wav -c 2 -D mcl

소스에서 현재 mpd 버전을 구축했습니다(http://www.musicpd.org/download/mpd/0.19/mpd-0.19.8.tar.xz) 이 튜토리얼을 따르십시오: http://www.infofreako.info/2014/04/building-mpd-on-raspberry-pi-with-opus-support/(추가 종속성이 필요함 libboost-dev및 libicu-dev)

pi@raspberrypi ~ $ mpc version
mpd version: 0.19.0
pi@raspberrypi ~ $ mpd --version
Music Player Daemon 0.19.8

하지만 여전히 오류가 발생합니다.

ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM mcl
Jan 25 10:23 : alsa_output: Failed to open "My ALSA Device" [alsa]: Failed to open ALSA device "mcl": No such file or directory
Jan 25 10:23 : output: Failed to open audio output
Jan 25 10:23 : client: [1] closed

default장치를 사용할 때 제대로 작동합니다( ladcomp또한 작동하지 않습니다).

따라서 다른 플레이어가 추측한 ALSA 구성에 오류/누락이 있거나 mpd가 잘못하고 있는 것입니다.

/etc/asound.conf가 없습니다. 여러 소스를 사용하여 다음 ~/.asoundrc를 만들었습니다.

pcm.!default {
    type hw
    card 0
    device 0
    } 

ctl.!default {
    type hw
    card 0
    device 0
}


###############


# compressor

pcm.ladcomp_limiter {
    type ladspa
    slave.pcm "plughw:0,0";
#    slave.pcm "default";
#    slave.pcm "makemono";

    path "/usr/lib/ladspa";
    plugins [{
        label fastLookaheadLimiter
        input {
            #InputGain(Db) -20 -> +20 ; Limit (db) -20 -> 0 ; Release time (s) 0.01 -> 2
            controls [ 20 0 0.8  ]
        }
    }]
}

pcm.ladcomp_compressor {
    type ladspa
    slave.pcm "ladcomp_limiter";
    path "/usr/lib/ladspa";
    plugins [{
        label dysonCompress
        input {
            #peak limit, release time, fast ratio, ratio
            controls [0 1 0.5 0.99]
        }
    }]
}

pcm.ladcomp {
    type plug
    slave.pcm "ladcomp_compressor";
}




### test mono downmix

#pcm.card0 {
#  type hw
#  card 0
#  device 0
#}

#ctl.card0 {
#  type hw
#  card 0
#  device 0
#}


#pcm.monocard {
#  slave.pcm card0
#  slave.channels 2
#  type plug
#}

#ctl.monocard {
#  type hw
#  card 0
#  device 0
#}

#pcm.!default monocard

####### didnt work, try this


pcm.mcl {
#pcm.makemono {
    type route
   # slave.pcm "plughw:0,0"
    slave.pcm "ladcomp"

    ttable {

    # Copy both input channels to output channel 0 (Left).
    0.0 1.0
    1.0 1.0
    # copy both input channels to output channel 1 (Right).
    0.1 1.0
    1.1 1.0
    }
}

#pcm.!default monocomplimiter


# EOF

pi@raspberrypi ~ $ grep -v '^$\|^\s*#' /etc/mpd.conf

music_directory         "/var/lib/mpd/music"
playlist_directory              "/var/lib/mpd/"
db_file                 "/var/lib/mpd/tag_cache"
log_file                        "/var/lib/mpd/mpd.log"
pid_file                        "/var/run/mpd/pid"
state_file                      "/var/lib/mpd/state"
sticker_file                   "/var/lib/mpd/sticker.sql"
user                            "mpd"
bind_to_address         "any"
metadata_to_use "artist,album,title,track,name,comment"
input {
        plugin "curl"
}
audio_output {
        type            "alsa"
        name            "My ALSA Device"
        device          "mcl"
}
mixer_type                      "disabled"
filesystem_charset              "UTF-8"
id3v1_encoding                  "UTF-8"


pi@raspberrypi ~ $ uname -r
3.18.3+

더 많은 정보가 필요하면 알려주시기 바랍니다.

편집하다:

pi@raspberrypi ~ $ cat /proc/asound/cards
 0 [ALSA           ]: bcm2835 - bcm2835 ALSA
                      bcm2835 ALSA
pi@raspberrypi ~ $ cat /proc/asound/devices
  0: [ 0]   : control
  1:        : sequencer
 16: [ 0- 0]: digital audio playback
 17: [ 0- 1]: digital audio playback
 33:        : timer
pi@raspberrypi ~ $

ALSA가 여기 구성에서 가상 장치를 생성하도록 할 수 있는 방법이 있습니까? mpd가 이를 찾을 수 있습니까(검색하는 경우)?

편집하다:

pi@raspberrypi ~ $ cat /proc/asound/pcm
00-00: bcm2835 ALSA : bcm2835 ALSA : playback 8
00-01: bcm2835 ALSA : bcm2835 IEC958/HDMI : playback 1
pi@raspberrypi ~ $ ls /proc/asound/dev
ls: cannot access /proc/asound/dev: No such file or directory
pi@raspberrypi ~ $ ls /dev/snd
controlC0  pcmC0D0p  pcmC0D1p  seq  timer
pi@raspberrypi ~ $ ls /proc/sound/
ls: cannot access /proc/sound/: No such file or directory
pi@raspberrypi ~ $ ls /proc/sound
ls: cannot access /proc/sound: No such file or directory
pi@raspberrypi ~ $ amixer
amixer: Mixer attach default error: Invalid argument
pi@raspberrypi ~ $ alsamixer
cannot open mixer: Invalid argument
pi@raspberrypi ~ $

편집하다:

pi@raspberrypi ~ $ alsamixer -c 0

일하다.