User:Nathanlkoch/Tutorials/Audio

Gentoo Audio Tweaks

Physical

Bluetooth

The following configuration will Max Bitrate settings for the A2DP-AAC Audio Profile on Pipewire/Pipewire-Pulse with Bluez5. Giving you the best possible audio quality. Noticible.

FILE /etc/pipewire/media-session.d/bluez-monitor.conf

# Bluez monitor config file for PipeWire version "0.3.33" #
#
# Copy and edit this file in /etc/pipewire/media-session.d/
# for systemwide changes or in
# ~/.config/pipewire/media-session.d/ for local changes.

properties = {
    # These features do not work on all headsets, so they are enabled
    # by default based on the hardware database. They can also be
    # forced on/off for all devices by the following options:

    #bluez5.enable-sbc-xq = true
    #bluez5.enable-msbc = true
    bluez5.enable-hw-volume = true

    # See bluez-hardware.conf for the hardware database.

    # Enabled headset roles (default: [ hsp_hs hfp_ag ]), this
    # property only applies to native backend. Currently some headsets
    # (Sony WH-1000XM3) are not working with both hsp_ag and hfp_ag
    # enabled, disable either hsp_ag or hfp_ag to work around it.
    #
    # Supported headset roles: hsp_hs (HSP Headset),
    #                          hsp_ag (HSP Audio Gateway),
    #                          hfp_hf (HFP Hands-Free),
    #                          hfp_ag (HFP Audio Gateway)
    #bluez5.headset-roles = [ hsp_hs hsp_ag hfp_hf hfp_ag ]

    # Enabled A2DP codecs (default: all).
    #bluez5.codecs = [ aac ldac aptx aptx_hd ]

    # Properties for the A2DP codec configuration
    bluez5.default.rate     = 48000
    bluez5.default.channels = 2
}

rules = [
    # An array of matches/actions to evaluate.
    {
        # Rules for matching a device or node. It is an array of
        # properties that all need to match the regexp. If any of the
        # matches work, the actions are executed for the object.
        matches = [
            {
                # This matches all cards.
                device.name = "~bluez_card.*"
            }
        ]
        actions = {
            # Actions can update properties on the matched object.
            update-props = {

                # Auto-connect device profiles on start up or when only partial
                # profiles have connected. Disabled by default if the property
                # is not specified.
                #bluez5.auto-connect = [
                #    hfp_hf
                #    hsp_hs
                #    a2dp_sink
                #    hfp_ag
                #    hsp_ag
                #    a2dp_source
                #]
                bluez5.auto-connect  = [ hfp_hf hsp_hs a2dp_sink ]

                # Hardware volume control (default: all)
                #bluez5.hw-volume = [
                #    hfp_hf
                #    hsp_hs
                #    a2dp_sink
                #    hfp_ag
                #    hsp_ag
                #    a2dp_source
                #]

                # LDAC encoding quality
                # Available values: auto (Adaptive Bitrate, default)
                #                   hq   (High Quality, 990/909kbps)
                #                   sq   (Standard Quality, 660/606kbps)
                #                   mq   (Mobile use Quality, 330/303kbps)
                bluez5.a2dp.ldac.quality  = hq

                # AAC variable bitrate mode
                # Available values: 0 (cbr, default), 1-5 (quality level)
                bluez5.a2dp.aac.bitratemode = 5

                # Profile connected first
                # Available values: a2dp-sink (default), headset-head-unit
                #device.profile = a2dp-sink

                # A2DP <-> HFP profile auto-switching (when device is default output)
                # Available values: false, role (default), true
                # 'role' will switch the profile if the recording application
                # specifies Communication (or "phone" in PA) as the stream role.
                bluez5.autoswitch-profile = true
            }
        }
    }
    {
        matches = [
            {
                # Matches all sources.
                node.name = "~bluez_input.*"
            }
            {
                # Matches all sinks.
                node.name = "~bluez_output.*"
            }
        ]
        actions = {
            update-props = {
                #node.nick            = "My Node"
                #node.nick            = null
                #priority.driver      = 100
                #priority.session     = 100
                node.pause-on-idle    = false
                #resample.quality     = 4
                #channelmix.normalize = false
                #channelmix.mix-lfe   = false
                #session.suspend-timeout-seconds = 5      # 0 disables suspend
                #monitor.channel-volumes = false

                # A2DP source role, "input" or "playback"
                # Defaults to "playback", playing stream to speakers
                # Set to "input" to use as an input for apps
                #bluez5.a2dp-source-role = input
            }
        }
    }
]

FILE /etc/bluetooth/main.conf

KernelExperimental = true
Experimental=true
RefreshDiscovery = true
FastConnectable = true
MultiProfile = multiple

Enabled extra featues and fast connect which is great.