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通过 Java 在多个 ALSA 输出上播放音乐

tag-icon • tag-icon linux java alsa
通过 Java 在多个 ALSA 输出上播放音乐

我安装了 7.1 环绕声卡，我想将输出拆分为 4 个立体声输出。这对 ALSA（甚至 PulseAudio）来说不是问题，但我无法让 Java 声音系统单独显示立体声输出。

这里有什么技巧？是否可以使用 ALSA 模拟硬件设备，以便 Java 能够看到它们？

Java 看到的是这样的：

Found Mixer: PulseAudio Mixer, version 0.02
    Found source line: interface SourceDataLine supporting 42 audio formats, and buffers of 0 to 1000000 bytes
        Line unavailable.
    Found source line: interface Clip supporting 42 audio formats, and buffers of 0 to 1000000 bytes
        Line unavailable.
    Found target line: interface TargetDataLine supporting 42 audio formats, and buffers of 0 to 1000000 bytes
        Line unavailable.
Found Mixer: DX [default], version 1.0.21
    Found target line: interface TargetDataLine supporting 84 audio formats, and buffers of at least 32 bytes
Found Mixer: DX [plughw:0,0], version 1.0.21
    Found source line: interface SourceDataLine supporting 96 audio formats, and buffers of at least 32 bytes
    Found source line: interface Clip supporting 96 audio formats, and buffers of at least 32 bytes
    Found target line: interface TargetDataLine supporting 24 audio formats, and buffers of at least 32 bytes
Found Mixer: DX [plughw:0,1], version 1.0.21
    Found source line: interface SourceDataLine supporting 24 audio formats, and buffers of at least 32 bytes
    Found source line: interface Clip supporting 24 audio formats, and buffers of at least 32 bytes
Found Mixer: Port DX [hw:0], version 1.0.21
    Found source line: Mic source port
    Found source line: Aux source port
    Found source line: Analog Input Monitor source port
    Found target line: Master target port
    Found target line: Analog Input Monitor target port

这是我的.asoundrc：

pcm_slave.eightchannels {
    pcm "surround71:DX,0"
    channels 8
}
pcm.stereo1 {
    type plughw
    slave.pcm {
        type dshare
        ipc_key 87882222
        slave eightchannels
        bindings [ 2 3 ]
    }
}
pcm.stereo2 {
    type plughw
    slave.pcm {
        type dshare
        ipc_key 87882222
        slave eightchannels
        bindings [ 4 5 ]
    }
}
pcm.stereo3 {
    type plughw
    slave.pcm {
        type dshare
        ipc_key 87882222
        slave eightchannels
        bindings [ 6 7 ]
    }
}
pcm.stereo4 {
    type plughw
    slave.pcm {
        type dshare
        ipc_key 87882222
        slave eightchannels
        bindings [ 0 1 ]
    }
}

ALSA 配置工作正常，因为我可以使用扬声器测试 -D 立体声 1 在立体声 1...4 输出上播放声音。

谢谢你！

答案1

答案是：不可以。Java 无法列出用户定义的 ALSA pcms，因为它仅公开硬件设备和“默认”设备。

从 ALSA 开发人员处获得的信息：http://www.spinics.net/linux/fedora/alsa-user/msg10796.html

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