pulseaudio-modules-bt

this repo is a fork of pulseaudio bluetooth modules

and adds LDAC, APTX, APTX-HD, AAC support, extended configuration for SBC

Added Codecs

APTX/APTX_HD sample format fixed to s32 in PA. (ffmpeg do the sample format transformation)

Extended SBC configuration

Added support for manual (expert) configuration for SBC codec parameters:

• Min and Max bitpool limits (2-250)
• Sampling frequency
• Audio channel mode
• Quantization bit allocation mode
• Frequency bands number
• Audio blocks number

You can use this parameters to override and fine-tune default SBC codec config and manually setup configurations like SBC XQ, or Dual Channel HD mode. More info about SBC configuration options can be found at LineageOS documentation. Also there is interactive calculator and unofficial device compatibility list that may help you to select proper values.

Parameter-names for module-bluez5-discover and valid values provided at the table below.

NOTE: Use these parameters with caution at your own risk! Invalid or extreme "out-of-spec" configurations may sometimes even cause malfunction for some cheap BT-audio devices. Usually these malfunctions can be fixed by resetting audio-device or sometimes simply by reconnecting with valid configuration.

Usage

Packages

wiki/Packages

also check issue#3

Configure modules

See below.

General Installation

Make Dependencies

• pulseaudio>=11.59.1
• bluez~=5.0
• dbus
• sbc
• [Optional] ffmpeg(libavcodec>=58, libavutil>=56) >= 4.0
• [Optional] fdk-aac(-free)>=0.1.5: pulseaudio-modules-bt use LC-AAC only
• [Optional] ldacBT/libldac
• cmake
• pkg-config, libtool, ...

Runtime Dependencies

• pulseaudio ( force preopen disabled / built with --disable-force-preopen)
• bluez
• dbus
• sbc
• [ fdk-aac(-free) ]
• [ libavcodec.so ]: APTX, APTX-HD support [Optional]
• [ libldac ]: LDAC encoding support, LDAC ABR support [Optional]

Build

backup original pulseaudio bt modules

MODDIR=`pkg-config --variable=modlibexecdir libpulse`

sudo find $MODDIR -regex ".*\(bluez5\|bluetooth\).*\.so" -exec cp {} {}.bak \;

pull sources

git clone https://github.com/EHfive/pulseaudio-modules-bt.git
cd pulseaudio-modules-bt
git submodule update --init

install

A. build for PulseAudio releases (e.g., v12.0, v12.2, etc.)

git -C pa/ checkout v`pkg-config libpulse --modversion|sed 's/[^0-9.]*\([0-9.]*\).*/\1/'`

mkdir build && cd build
cmake ..
make
sudo make install

B. or build for PulseAudio git master

git -C pa/ checkout master
mkdir build && cd build
cmake -DFORCE_LARGEST_PA_VERSION=ON ..
make
sudo make install

Cmake A2DP codecs options: CODEC_APTX_FF, CODEC_APTX_HD_FF, CODEC_AAC_FDK, CODEC_LDAC

Load Modules

pulseaudio -k

# if pulseaudio not restart automatically, run
pulseaudio --start

if you got a warning like below, you need to rebuild pulseaudio with --disable-force-preopen flag

pulseaudio: symbol lookup error: pulseaudio: undefined symbol: pa_a2dp_codec_sbc

Connect device

Connect your bluetooth device and switch audio profile to 'A2DP Sink';

If there is only profile 'HSP/HFP' and 'off', disconnect and reconnect your device.

The issue has been fixed in bluez 5.51.

Module Arguments

module-bluez5-discover arg:a2dp_config

Encoders configurations

Configure

edit /etc/pulse/default.pa

append arguments to 'load-module module-bluetooth-discover'

(module-bluetooth-discover pass all arguments to module-bluez5-discover)

# LDAC Standard Quality
load-module module-bluetooth-discover a2dp_config="ldac_eqmid=sq"

# LDAC High Quality; Force LDAC/PA PCM sample format as Float32LE
#load-module module-bluetooth-discover a2dp_config="ldac_eqmid=hq ldac_fmt=f32"

equivalent to commands below if you do not use 'module-bluetooth-discover'

load-module module-bluez5-discover a2dp_config="ldac_eqmid=sq"

#load-module module-bluez5-discover a2dp_config="ldac_eqmid=hq ldac_fmt=f32"

Others

see Wiki

TODO

add ldac abr (Adaptive Bit Rate) supprot

add APTX , APTX HD Codec support using ffmpeg

add AAC support using Fraunhofer FDK AAC codec library

add codec switching support using latest blueZ's experimental feature

Copyright

  pulseaudio-modules-bt

  Copyright (C) 2018-2019  Huang-Huang Bao

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program. If not, see <http://www.gnu.org/licenses/>.