ALSA：PCM设备和asoundrc

我尝试使用ALSA SND-aloop 这里录制当前播放的声音是我asound.confALSA：PCM设备和asoundrc

pcm.multi { 
    type route; 
    slave.pcm { 
     type multi; 
     slaves.a.pcm "output"; 
     slaves.b.pcm "loopin"; 
     slaves.a.channels 2; 
     slaves.b.channels 2; 
     bindings.0.slave a; 
     bindings.0.channel 0; 
     bindings.1.slave a; 
     bindings.1.channel 1; 
     bindings.2.slave b; 
     bindings.2.channel 0; 
     bindings.3.slave b; 
     bindings.3.channel 1; 
    } 

    ttable.0.0 1; 
    ttable.1.1 1; 
    ttable.0.2 1; 
    ttable.1.3 1; 
} 

pcm.!default { 
     type plug 
     slave.pcm "multi" 
} 

pcm.output { 
     type hw 
     card 0 
} 

pcm.loopin { 
     type plug 
     slave.pcm "hw:1,0,0" 
} 

pcm.loopout { 
     type plug 
     slave.pcm "hw:1,1,0" 
}

现在，当我运行这样的命令：

play sound.mp3

和：

arecord -c 2 -f S16_LE -r 48000 -D loopout test.wav

声音是在声卡播放0和记录为test.wav 现在我的默认PCM路由声音循环输出。

但是当我列出PCM设备：

aplay -L 
null 
    Discard all samples (playback) or generate zero samples (capture) 
sysdefault:CARD=ALSA 
    bcm2835 ALSA, bcm2835 ALSA 
    Default Audio Device 
sysdefault:CARD=Loopback 
    Loopback, Loopback PCM 
    Default Audio Device 
front:CARD=Loopback,DEV=0 
    Loopback, Loopback PCM 
    Front speakers 
surround21:CARD=Loopback,DEV=0 
    Loopback, Loopback PCM 
    2.1 Surround output to Front and Subwoofer speakers 
surround40:CARD=Loopback,DEV=0 
    Loopback, Loopback PCM 
    4.0 Surround output to Front and Rear speakers 
surround41:CARD=Loopback,DEV=0 
    Loopback, Loopback PCM 
    4.1 Surround output to Front, Rear and Subwoofer speakers 
surround50:CARD=Loopback,DEV=0 
    Loopback, Loopback PCM 
    5.0 Surround output to Front, Center and Rear speakers 
surround51:CARD=Loopback,DEV=0 
    Loopback, Loopback PCM 
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers 
surround71:CARD=Loopback,DEV=0 
    Loopback, Loopback PCM 
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers

我没有看到asound.conf 是正常增加PCM？我的问题是，我有一个应用程序配置使用此列表不使用我的默认pcm。

来源

2017-02-10 rem

aplay -L只能显示定义这种描述字符串的设备。（这有点无证）

pcm.multi { 
    ... 

    hint.description "My Little Device" 
}

来源

2017-02-10 09:47:06

非常感谢!!! – rem

ALSA：PCM设备和asoundrc

回答

相关问题