pulseaudio-modules-bt

this repo is a fork of pulseaudio bluetooth modules

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

Added Codecs

Codec	Encoding(source role)	Decoding(sink role)	Sample format	Sample frequnecy
AAC	✔	✔	s16,s32	8..96 khz
APTX	✔	✔	s16	16..48 khz
APTX HD	✔	✔	s24	16..48 khz
LDAC	✔	✘	s16,s24,s32,f32	44.1..96 khz

APTX/APTX_HD sample format fixed to s32 in PA.

Usage

Packages

wiki/Packages

also check #3

General Installation

For packager, developer, other PA version user:

I also create patch files, you can find them in releases. Apply patches and recompile/repackage pulseaudio.

And you may use my CmakeList.txt (may also needs modifications) as well, just copy out patched files to src dir and keep file structure.

Make Dependencies

pulseaudio,libpulse~=12.0
bluez-libs/libbluetooth~=5.0
libdbus
ffmpeg(libavcodec>=58, libavutil>=56) >= 4.0
libsbc
libfdk-aac
libtool
cmake
pkg-config

Runtime Dependencies

pulseaudio
bluez
dbus
sbc
libfdk-aac
[Optional] ffmpeg(libavcodec, libavutil) --- APTX, APTX-HD support
[Optional] ldacBT_enc.so ldacBT_abr.so --- LDAC encoding support, LDAC ABR support

Note: CMakeLists.txt check if ldacBT installed; If not, it will build libldac and install libldac to PA modules dir.

backup original pulseaudio bt modules

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

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

install

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

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

Load Modules

pulseaudio -k

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

then 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

" When the device connects automatically (by powering on after being paired) A2DP is 'unavailable' " -----Issue: cannot select a2dp profile

as an alternative, you can fix it with this udev script

Module Aruguments

module-bluez5-discover arg:a2dp_config

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_after_buffer	<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

config

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~~

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