rk3588sdk/env/rootfs/etc/asound.conf

pcm.!default {
    type plug
    slave.pcm "default_playback"
}
pcm.default_playback {
    type softvol
    slave {
        pcm "xa8326"
    }
    control {
        name "default_playback"
        card 1
    }
    min_dB -40.0
    max_dB 0.0
    resolution 100
}

pcm.bg_playback {
    type softvol
    slave {
        pcm "xa8326"
    }
    control {
        name "bg_playback"
        card 1
    }
    min_dB -40.0
    max_dB 0.0
    resolution 100
}

# 放音设备
pcm.xa8326 {
    type plug
    slave {
        pcm {
            type dmix
            ipc_key 321456  # any unique value
            ipc_key_add_uid true
            slave {
                pcm "hw:2,0"
                period_time 100000 # 100ms
                format S16_LE
                channels 2
            }
        }
        rate 48000
        format S16_LE
        channels 2
    }
}

# 录音设备
pcm.__recorder {
    type multi
    slaves.xa8326.pcm "hw:2,0"
    slaves.xa8326.channels 2
    slaves.pdm.pcm "hw:1,0"
    slaves.pdm.channels 8

    bindings.0.slave pdm
    bindings.0.channel 0

    bindings.1.slave pdm
    bindings.1.channel 1

    bindings.2.slave pdm
    bindings.2.channel 2

    bindings.3.slave pdm
    bindings.3.channel 3

    bindings.4.slave pdm
    bindings.4.channel 4
    
    bindings.5.slave pdm
    bindings.5.channel 5

    bindings.6.slave pdm
    bindings.6.channel 6

    bindings.7.slave pdm
    bindings.7.channel 7

    bindings.8.slave xa8326
    bindings.8.channel 0

    bindings.9.slave xa8326
    bindings.9.channel 1    
}
# 重采样
pcm.recorder {
    type plug
    slave {
        pcm "__recorder"
        rate 48000
        format S16_LE
        channels 10
    }
}