This directory contains the AES67 daemon source code.
The daemon can be cross-compiled for multiple platforms and implements the following functionalities:

communication and configuration with the ALSA RAVENNA/AES67 driver via netlink
HTTP REST API for control and configuration
session handling and SDP parsing and creation
SAP discovery protocol implementation
IGMP handling for SAP and RTP sessions

The directory also contains the daemon regression tests in the tests subdirectory. To run daemon tests install the ALSA RAVENNA/AES67 kernel module enter the tests subdirectory and run ./daemon-test -l all

See the README file in this directory for additional information about the AES67 daemon configuration and the HTTP REST API.

webui directory

This directory contains the AES67 daemon WebUI configuration implemented using React.
With the WebUI a user can do the following operations:

change the daemon configuration, this causes a daemon restart
edit PTP clock slave configuration and monitor PTP slave status
add and edit RTP Sources
add, edit and monitor RTP Sinks

3rdparty directory

This directory used to download the 3rdparty open source used by the daemon.
The patches subdirectory contains patches applied to the ALSA RAVENNA/AES67 module to compile with the Linux Kernel 5.x and to enable operations on the network loopback device (for testing purposes).

The ALSA RAVENNA/AES67 kernel module is responsible for:

registering as an ALSA driver
generating and receiving RTP audio packets
PTP slave operations and PTP driven interrupt loop
netlink communication between user and kernel

See ALSA RAVENNA/AES67 Driver README for additional information about the Merging Technologies module and for proper Linux Kernel configuration and tuning.

demo directory

This directory contains a the daemon configuration and status files used to run a short demo on the network loopback device. The demo is described below.

Prerequisite

The daemon has been tested on Ubuntu 18.04 and 19.10 using:

Linux kernel version >= 5.0.0
GCC version >= 7.4 / clang >= 6.0.0 (C++17 support required)
cmake version >= 3.10.2
node version >= 8.10.0
mpm version >= 3.5.2
boost libraries version >= 1.65.1

The ubuntu-packages.sh script can be used to install all the packages required to compile and run the AES67 daemon, the daemon tests and the demo. See PulseAudio and scripts notes.

How to build

To compile the AES67 daemon and the WebUI use the build.sh script. See script notes.
The script performs the following operations:

checkout, patch and build the Merging Technologies ALSA RAVENNA/AES67 module
checkout the cpp-httplib
build and deploy the WebUI
build the AES67 daemon

Run the Demo

To run a simple demo use the run_demo.sh script. See script notes.

The demo performs the following operations:

setup system parameters
stop PulseAudio, this uses and keeps busy the ALSA playback and capture devices causing instability problems. See PulseAudio.
install the ALSA RAVENNA/AES67 module
start the ptp4l as master clock on the network loopback device
start the AES67 daemon and creates a source and a sink according to the status file in the demo directory
open a browser on the daemon PTP status page
wait for the Ravenna driver PTP slave to synchronize
start recording on the configured ALSA sink for 60 seconds to the wave file in ./demo/sink_test.wav
start playing a test sound on the configured ALSA source
wait for the recording to complete and terminate ptp4l and the AES67 daemon

Notes

All the scripts in this repository are provided as a reference to help setting up the system and run a simple demo.
They have been tested on Ubuntu 18.04 and 19.10 distros only.
PulseAudio can create instability problems.
Before running the daemon verify that PulseAudio is not running with ps ax | grep pulseaudio
In case it's running try to execute the script daemon/scripts/disable_pulseaudio.sh to stop it. If after this the process is still alive consider renaming the executable with sudo mv /usr/bin/pulseaudio /usr/bin/_pulseaudio and reboot the system.

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