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pusleaudio pactl：设置源音量与设置源输出音量？

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pusleaudio pactl：设置源音量与设置源输出音量？

set-source-volume 和 set-source-output-volume 有什么区别？来源是指麦克风。那么输出音量又是多少呢？

手册页实际上没有帮助......

 set-source-volume SOURCE VOLUME [VOLUME ...]
              Set  the  volume  of  the  specified  source  (identified  by  its symbolic name or
              numerical index). VOLUME can be specified as  an  integer  (e.g.  2000,  16384),  a
              linear  factor  (e.g. 0.4, 1.100), a percentage (e.g. 10%, 100%) or a decibel value
              (e.g. 0dB, 20dB). If the volume specification start  with  a  +  or  -  the  volume
              adjustment  will  be  relative  to the current source volume. A single volume value
              affects all channels; if multiple volume values are given their number has to match
              the source's number of channels.

set-source-output-volume OUTPUT VOLUME [VOLUME ...]
          Set  the volume of the specified source output (identified by its numerical index).
          VOLUME can be specified as an integer (e.g. 2000, 16384),  a  linear  factor  (e.g.
          0.4,  1.100), a percentage (e.g. 10%, 100%) or a decibel value (e.g. 0dB, 20dB). If
          the volume specification start with a + or - the volume adjustment will be relative
          to the current source output volume. A single volume value affects all channels; if
          multiple volume values are given their number has  to  match  the  source  output's
          number of channels.

答案1

我不太清楚使用pactl和之间有什么区别，pacmd但我使用后者，它有一个list-source-outputs命令。

您可以使用 返回的索引pacmd list-source-outputs来配置每个源输出的输出量。

例如，现在我有一个 loobpack 模块，将来自麦克风/线路输入输入的手机音乐与计算机声音混合，并将它们通过扬声器播放，我在下面单独列出：

    index: 291
    driver: <module-loopback.c>
    flags: START_CORKED 
    state: RUNNING
    source: 213 <alsa_input.pci-0000_00_14.2.analog-stereo>
    volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
            balance 0.00
    muted: no
    current latency: 0.00 ms
    requested latency: 66.67 ms
    sample spec: s16le 2ch 44100Hz
    channel map: front-left,front-right
                 Stereo
    resample method: (null)
    owner module: 204
    properties:
        media.role = "abstract"
        module-stream-restore.id = "source-output-by-media-role:abstract"
        media.name = "Loopback to Built-in Audio Analog Stereo"
        media.icon_name = "audio-card-pci"

我可以使用以下命令将音量设置为 50%：

pacmd set-source-output-volume 291 32768

我当然可以根据输入做同样的事情，尽管我的粒度会更小。为了将其用作线路输入，我将音量设置为基本音量，即 10% (6554)。该输入兼作麦克风输入，因此前置放大器必须调低。

设置源接收器音量还可用于从单个相同输入获取多个接收器上的不同音量级别。你可以为前任。以 100% 录制多个主通道，同时在监视器上以不同电平混合它们。

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