耳机音频通道反转了，如何在 Pipewire 上更改通道位置？

Question

所以我的前面板插孔出现这个问题，导致音频反转，一直这样，但我总是设法在 Windows 或 Ubuntu 上交换频道（通过 pulseaudio），只需找到一个配置文件并以有效的方式映射我的位置。

我最近安装了 Pipewire，以便通过 discord 等轻松传输音频，但我似乎找不到如何使用它映射频道的明确线索。

如果有人能告诉我正确的配置文件在哪里以及哪一行控制音频通道的位置，我会很高兴并非常感激。

编辑：我在 ubuntu 21.10 上，pipewire 是版本 3.34

我的 pipewire 配置文件位于 etc/pipewire/pipewire.conf

# Daemon config file for PipeWire version "0.3.32" #
#
# Copy and edit this file in /etc/pipewire for systemwide changes
# or in ~/.config/pipewire for local changes.

context.properties = {
    ## Configure properties in the system.
    #library.name.system                   = support/libspa-support
    #context.data-loop.library.name.system = support/libspa-support
    #support.dbus                          = true
    #link.max-buffers                      = 64
    link.max-buffers                       = 16                       # version < 3 clients can't handle more
    #mem.warn-mlock                        = false
    #mem.allow-mlock                       = true
    #mem.mlock-all                         = false
    #clock.power-of-two-quantum            = true
    #log.level                             = 2
    audio.position   = "FR,FL"

    core.daemon                            = true                     # listening for socket connections
    core.name                              = pipewire-0               # core name and socket name

    ## Properties for the DSP configuration.
    #default.clock.rate        = 48000
    #default.clock.quantum     = 1024
    #default.clock.min-quantum = 32
    #default.clock.max-quantum = 8192
    #default.video.width       = 640
    #default.video.height      = 480
    #default.video.rate.num    = 25
    #default.video.rate.denom  = 1
    #
    # These overrides are only applied when running in a vm.
    vm.overrides = {
        default.clock.min-quantum     = 1024
    }
}

context.spa-libs = {
    #<factory-name regex> = <library-name>
    #
    # Used to find spa factory names. It maps an spa factory name
    # regular expression to a library name that should contain
    # that factory.
    #
    audio.convert.* = audioconvert/libspa-audioconvert
    api.alsa.*      = alsa/libspa-alsa
    api.v4l2.*      = v4l2/libspa-v4l2
    api.libcamera.* = libcamera/libspa-libcamera
    api.bluez5.*    = bluez5/libspa-bluez5
    api.vulkan.*    = vulkan/libspa-vulkan
    api.jack.*      = jack/libspa-jack
    support.*       = support/libspa-support
    #videotestsrc   = videotestsrc/libspa-videotestsrc
    #audiotestsrc   = audiotestsrc/libspa-audiotestsrc
}

context.modules = [
    #{   name = <module-name>
    #    [ args = { <key> = <value> ... } ]
    #    [ flags = [ [ ifexists ] [ nofail ] ]
    #}
    #
    # Loads a module with the given parameters.
    # If ifexists is given, the module is ignored when it is not found.
    # If nofail is given, module initialization failures are ignored.
    #

    # Uses RTKit to boost the data thread priority.
    {   name = libpipewire-module-rtkit
        args = {
            #nice.level   = -11
            #rt.prio      = 88
            #rt.time.soft = 2000000
            #rt.time.hard = 2000000
        }
        flags = [ ifexists nofail ]
    }

    # Set thread priorities without using RTKit.
    #{   name = libpipewire-module-rt
    #    args = {
    #        nice.level   = -11
    #        rt.prio      = 88
    #        rt.time.soft = 2000000
    #        rt.time.hard = 2000000
    #    }
    #    flags = [ ifexists nofail ]
    #}

    # The native communication protocol.
    {   name = libpipewire-module-protocol-native }

    # The profile module. Allows application to access profiler
    # and performance data. It provides an interface that is used
    # by pw-top and pw-profiler.
    {   name = libpipewire-module-profiler }

    # Allows applications to create metadata objects. It creates
    # a factory for Metadata objects.
    {   name = libpipewire-module-metadata }

    # Creates a factory for making devices that run in the
    # context of the PipeWire server.
    {   name = libpipewire-module-spa-device-factory }

    # Creates a factory for making nodes that run in the
    # context of the PipeWire server.
    {   name = libpipewire-module-spa-node-factory }

    # Allows creating nodes that run in the context of the
    # client. Is used by all clients that want to provide
    # data to PipeWire.
    {   name = libpipewire-module-client-node }

    # Allows creating devices that run in the context of the
    # client. Is used by the session manager.
    {   name = libpipewire-module-client-device }

    # The portal module monitors the PID of the portal process
    # and tags connections with the same PID as portal
    # connections.
    {   name = libpipewire-module-portal
        flags = [ ifexists nofail ]
    }

    # The access module can perform access checks and block
    # new clients.
    {   name = libpipewire-module-access
        args = {
            # access.allowed to list an array of paths of allowed
            # apps.
            #access.allowed = [
            #    /usr/bin/pipewire-media-session
            #]

            # An array of rejected paths.
            #access.rejected = [ ]

            # An array of paths with restricted access.
            #access.restricted = [ ]

            # Anything not in the above lists gets assigned the
            # access.force permission.
            #access.force = flatpak
        }
    }

    # Makes a factory for wrapping nodes in an adapter with a
    # converter and resampler.
    {   name = libpipewire-module-adapter }

    # Makes a factory for creating links between ports.
    {   name = libpipewire-module-link-factory }

    # Provides factories to make session manager objects.
    {   name = libpipewire-module-session-manager }
]

context.objects = [
    #{   factory = <factory-name>
    #    [ args  = { <key> = <value> ... } ]
    #    [ flags = [ [ nofail ] ]
    #}
    #
    # Creates an object from a PipeWire factory with the given parameters.
    # If nofail is given, errors are ignored (and no object is created).
    #
    #{ factory = spa-node-factory args = { factory.name = videotestsrc node.name = videotestsrc Spa:Pod:Object:Param:Props:patternType = 1 } }
    #{ factory = spa-device-factory args = { factory.name = api.jack.device foo=bar } flags = [ nofail ] }
    #{ factory = spa-device-factory args = { factory.name = api.alsa.enum.udev } }
    #{ factory = spa-node-factory   args = { factory.name = api.alsa.seq.bridge node.name = Internal-MIDI-Bridge } }
    #{ factory = adapter            args = { factory.name = audiotestsrc node.name = my-test } }
    #{ factory = spa-node-factory   args = { factory.name = api.vulkan.compute.source node.name = my-compute-source } }

    # A default dummy driver. This handles nodes marked with the "node.always-driver"
    # property when no other driver is currently active. JACK clients need this.
    {   factory = spa-node-factory
        args = {
            factory.name    = support.node.driver
            node.name       = Dummy-Driver
            node.group      = pipewire.dummy
            priority.driver = 20000
        }
    }
    {   factory = spa-node-factory
        args = {
            factory.name    = support.node.driver
            node.name       = Freewheel-Driver
            priority.driver = 19000
            node.group      = pipewire.freewheel
            node.freewheel  = true
        }
    }
    This creates a new Source node. It will have input ports
    that you can link, to provide audio for this source.
    {   factory = adapter
        args = {
            factory.name     = support.null-audio-sink
            node.name        = "my-mic"
            node.description = "Microphone"
            media.class      = "Audio/Source/Virtual"
            audio.position   = "FR,FL"
        }
    }

     This creates a single PCM source device for the given
     alsa device path hw:0. You can change source to sink
     to make a sink in the same way.
    {   factory = adapter
        args = {
            factory.name            = api.alsa.pcm.source
            node.name               = "alsa-source"
            node.description        = "PCM Source"
            media.class             = "Audio/Source"
            api.alsa.path           = "hw:0"
            api.alsa.period-size   = 1024
            api.alsa.headroom      = 0
            api.alsa.disable-mmap  = false
            api.alsa.disable-batch = false
            audio.format           = "S16LE"
            audio.rate             = 48000
            audio.channels         = 2
            audio.position         = "FR,FL"
        }
    }
]

context.exec = [
    #{ path = <program-name> [ args = "<arguments>" ] }
    #
    # Execute the given program with arguments.
    #
    # You can optionally start the session manager here,
    # but it is better to start it as a systemd service.
    # Run the session manager with -h for options.
    #
    #{ path = "/usr/bin/pipewire-media-session"  args = "" }
    #
    # You can optionally start the pulseaudio-server here as well
    # but it is better to start it as a systemd service.
    # It can be interesting to start another daemon here that listens
    # on another address with the -a option (eg. -a tcp:4713).
    #
    #{ path = "/usr/bin/pipewire" args = "-c pipewire-pulse.conf" }
]

channel-map = right,left

Answer 1

好的，我安装了 EasyEffects，它捆绑了一个很棒的插件，叫做 Stereo Tool，有了它，我可以轻松翻转 FL 和 FR 通道，真是天赐之物！据我所知，它可以管理整个管道，所以它是一款功能强大的工具。EasyEffects 上的插件是这样的

Answer 2

感谢您的提问和回答，我发现这个也在寻求类似的解决方案。然而 EasyEffects 没有路由到正确的设备，当我尝试摆弄它以尝试让它按照我喜欢的方式工作时，音频系统一直崩溃。

我最终回顾了PipeWire 文档只需对示例进行轻微调整，解决方案就能完美发挥作用。

完整步骤：

1. 我将文件复制/usr/share/pipewire/pipewire.conf到/etc/pipewire/pipewire.conf（这将是系统范围的。您可以将其复制到~/.config/pipewire/pipewire.conf用户设置）。

2. 然后我添加了以下模块：

   context.modules = [
   ...
   ##### copy the lines below and add to your /etc/pipewire/pipewire.conf
   #####
   {   name = libpipewire-module-loopback
           args = {
               audio.position = [ FL FR ]
               capture.props = {
                   media.class = Audio/Sink
                   node.name = my_sink
                   node.description = "my-sink"
                   #node.latency = 1024/48000
                   #audio.rate = 44100
                   #audio.channels = 2
                   #audio.position = [ FL FR ]
                   #node.target = "my-default-sink"
               }
               playback.props = {
                   #media.class = Audio/Source
                   node.name = my_sink
                   node.description = "my-sink"
                   #node.latency = 1024/48000
                   #audio.rate = 44100
                   #audio.channels = 2
                   audio.position = [ FR FL ]
                   node.target = "my-default-sink"
               }
           }
       }
   
   

   这是来自‘创建组合接收器/源’主题的，与示例的唯一区别是我反转的那条audio.position线。playback.props

3. 重新启动管道：

   systemctl --user restart pipewire pipewire-pulse pipewire-media-session.service
   

4. 在 GNOME 设置中选择my-sink作为默认音频设备会反转频道，而且它似乎无处不在。