Adds Sony LDAC, aptX, aptX HD, AAC codecs (A2DP Audio) support to PulseAudio on Linux
Branch: master
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this repo is a fork of pulseaudio bluetooth modules

and adds LDAC, APTX, APTX-HD, AAC support

Added Codecs

Codec Encoding(source role) Decoding(sink role) Sample format(s) Sample frequnecies
AAC s16 8, 11.025, 12,16, 22.05, 24, 32, 44.1, 48, 64, 88.2, 96 khz
APTX s16 16, 32, 44.1, 48 khz
LDAC s16,s24,s32,f32 44.1, 48, 88.2, 96 khz

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




also check issue#3

Configure modules

See bottom.

General Installation

Make Dependencies

  • pulseaudio,libpulse>=11.59.1
  • bluez-libs/libbluetooth~=5.0
  • libdbus
  • ffmpeg(libavcodec>=58, libavutil>=56) >= 4.0
  • libsbc
  • libfdk-aac>=0.1.5
  • libtool
  • cmake
  • pkg-config

Runtime Dependencies

  • pulseaudio
  • bluez
  • dbus
  • sbc
  • libfdk-aac
  • [Optional] ffmpeg(, --- APTX, APTX-HD support
  • [Optional] ldacBT/libldac (, --- LDAC encoding support, LDAC ABR support

Note: CMakeLists.txt check if ldacBT installed; If not, it will build libldac and installing libldac to PA modules dir. See cmake option FORCE_BUILD_LDAC or FORCE_NOT_BUILD_LDAC .


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
cd pulseaudio-modules-bt
git submodule update --init


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 ..
sudo make install

B. or build for PulseAudio git master

mkdir build && cd build
sudo make install

Load Modules

pulseaudio -k

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

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 latest bluez git master, see

As an alternative, you can fix it with this udev script.

Run pactl list | grep a2dp_codec to see which codec device are using.

Module Aruguments

module-bluez5-discover arg:a2dp_config

Encoders configurations

Key Value Desc Default
ldac_eqmid hq LDAC High Quality auto
sq LDAC Standard Quality
mq LDAC Mobile use Quality
auto /abr LDAC Adaptive Bit Rate
ldac_fmt s16 16-bit signed (little endian) auto
s24 24-bit signed
s32 32-bit signed
f32 32-bit float
auto Ref default-sample-format
aac_bitrate_mode [1, 5] Variable Bitrate (VBR) 5
0 Constant Bitrate (CBR)
aac_afterburner (which was "aac_after_buffer" before 359ab0 <on/off> Enable/Disable AAC encoder afterburner feature off
aac_fmt s16 16-bit signed (little endian) auto
s32 32-bit signed
auto Ref default-sample-format


edit /etc/pulse/

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"


see Wiki


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