Limit number of SBC frames to fit into single MTU

- Calculate number of SBC frames to fit into single MTU for EDR capable
  remote devices. This makes sure the maximum utilization of the
  available bandwidth, keeping the bitrate at high quality.
- This change helps to address the discrepancy seen with a few available
  2 Mbps headsets which set the AVDTP media MTU size greater than the
  2DH5 packet payload size which eventually forces AVDTP packets to get
  fragmented in the controller. This change ensures packing of the SBC
  frames in a way that AVDTP packet size fits within the 2DH5 payload
- As packet size is restricted to meet the required bit rate more than
  one AVDTP packet can be sent to the controller in a given iteration
  based on the bit rate requirement.

Bug: 24875861
Change-Id: Icae7656ad563bbbdef65ecbfa15a89b26cf9edb2
3 files changed
tree: 150b4a74e344e8d488bd4eca7dbd9309c14fc6bf
  1. .gitignore
  2. .gn
  9. audio_a2dp_hw/
  10. bta/
  11. btcore/
  12. btif/
  13. build/
  14. conf/
  15. device/
  16. doc/
  17. embdrv/
  18. hci/
  19. include/
  20. main/
  21. osi/
  22. service/
  23. stack/
  24. test/
  25. tools/
  26. udrv/
  27. utils/
  28. vendor_libs/
  29. vnd/

Fluoride Bluetooth stack

Building and running on AOSP

Just build AOSP - Fluoride is there by default.

Building and running on Linux

Instructions for Ubuntu, tested on 15.10 with GCC 5.2.1.

Install required libraries

sudo apt-get install libevent-dev

Install build tools

  • Install ninja build system
sudo apt-get install ninja-build

or download binary from

  • Install gn - meta-build system that generates NinjaBuild files.

Get sha1 of current version from here and then download corresponding executable:

wget -O gn<gn.sha1>

i.e. if sha1 is “3491f6687bd9f19946035700eb84ce3eed18c5fa” (value from 24 Feb 2016) do

wget -O gn

Then make binary executable and put it on your PATH, i.e.:

chmod a+x ./gn
sudo mv ./gn /usr/bin

Download source

mkdir ~/fluoride
cd ~/fluoride
git clone

Then fetch third party dependencies:

cd ~/fluoride/bt
mkdir third_party
cd third_party
git clone
git clone
git clone
git clone

And third party dependencies of third party dependencies:

cd fluoride/bt/third_party/libchrome/base/third_party
mkdir valgrind
cd valgrind
curl | base64 -d > valgrind.h
curl | base64 -d > memcheck.h

Fluoride currently has dependency on some internal Android projects, which also need to be downloaded. This will be removed in future:

cd ~/fluoride
git clone
git clone
git clone

Configure your build

We need to configure some paths to make the build successful. Run:

cd ~/fluoride/bt
gn args out/Default

This will prompt you to fill the contents of your “out/Default/” file. Make it look like below. Replace “/home/job” with path to your home directory, and don't use “~” in build arguments:

# Build arguments go here. Examples:
#   is_component_build = true
#   is_debug = false
# See "gn args <out_dir> --list" for available build arguments.

libhw_include_path = "/home/job/fluoride/libhardware/include"
core_include_path = "/home/job/fluoride/core/include"
audio_include_path = "/home/job/fluoride/media/audio/include"

Then generate your build files by calling

cd ~/fluoride/bt
gn gen out/Default


cd ~/fluoride/bt
ninja -C out/Default all

This will build all targets (the shared library, executables, tests, etc) and put them in out/Default. To build an individual target, replace “all” with the target of your choice, e.g. ninja -C out/Default net_test_osi.


cd ~/fluoride/bt/out/Default
LD_LIBRARY_PATH=./ ./bluetoothtbd -create-ipc-socket=fluoride