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DISCONTINUATION OF PROJECT.

This project will no longer be maintained by Intel.

Intel has ceased development and contributions including, but not limited to, maintenance, bug fixes, new releases, or updates, to this project.

Intel no longer accepts patches to this project.

If you have an ongoing need to use this project, are interested in independently developing it, or would like to maintain patches for the open source software community, please create your own fork of this project.

AVB Stream Handler

The AVB Stream Handler acts as a link between the AVB-capable Ethernet interface and audio/video applications local to the device. Audio applications can receive and transmit audio data through ALSA interfaces. Video applications can receive and transmit either H.264 encoded video or MPEG-TS streams. The Stream Handler ensures proper AVB packet generation following the IEEE1722 standard and observes the subset of IEEE802.1Q deemed relevant for automotive applications.

Getting started

Clone the following:

  • avb_sh (run git submodule update --init after cloning)
  • alsa-lib
  • dlt-daemon

Prerequisites

Ensure that the following libraries are already installed

  • pci-devel/pciutils, dbus/dbus-devel, gtest-dev, cap-dev
  • sndfile, boost, intel-tbb, doxygen, graphviz

Build and Install

On production environment, all dependencies can be installed on default system directories, such as /usr/lib or /usr/bin.


# ALSA-LIB #

$ autoreconf -i
$ ./configure --with-pythonlibs="-lpthread -lm -ldl -lpython2.7" --with-pythonincludes=-I/usr/include/python2.7
$ make
$ make install


# DLT-DAEMON #

$ mkdir build && cd build
$ cmake .. -DWITH_DLT_CXX11_EXT=ON
$ make
$ make install


# KERNEL SOURCES #

- install your distro's kernel source package.
- if it isn't provided, then check your version with `uname -r`
- go to https://mirrors.edge.kernel.org/pub/linux/kernel/ and download the
  right .tar.gz file for your version and do the following:
$ sudo mkdir -p /usr/src
$ sudo mv linux-tarball-FOO.tar.gz /usr/src
$ cd /usr/src
$ sudo tar xf linux-tarball-FOO.tar.gz
$ sudo mv linux-FOO linux-`uname -r`
$ cd linux-VERSION
$ zcat /proc/config.gz | sudo tee .config
$ sudo -E make modules_prepare


# AVB StreamHandler #

$ mkdir build && cd build
$ cmake -DIAS_PREPRODUCTION_SW="" -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_INSTALL_LIBDIR=lib64 -DIAS_IS_HOST_BUILD=1 -DIAS_DISABLE_DOC=1 ../
$ make
$ sudo make install


### Send an Audio stream w/ AVBSH demo

* This setup consists of two systems, both equipped with an I210 card that
  are connected over ethernet, where one acts as a Master and the other as
  a slave.
* The following steps need to be replicated on both the systems.

Initial prep

  • Create user groups ias_audio and ias_avb and add yourself $ sudo groupadd ias_avb $ sudo groupadd ias_audio $ sudo usermod -a -G ias_avb $ sudo usermod -a -G ias_audio
  • Restart the session.

alsa configuration, and libasound module files setup ( This instruction is just for your information as 'make install'command in AVB StreamHandler section above already takes care of it)

(for alsa lib v.1.1.6 or before)
	$ cp deps/audio/common/public/res/50-smartx.conf /usr/share/alsa/alsa.conf.d/51-smartx.conf
(for alsa lib v1.1.7 or later, conf location is fixed to /etc/alsa/conf.d/)
	$ cp deps/audio/common/public/res/50-smartx.conf /etc/alsa/conf.d/51-smartx.conf

$ cp build/deps/audio/common/libasound_module_* /usr/lib/alsa-lib/

- Modify 51-smartx.conf to include:
	pcm_type.smartx {
		lib "<path to lib>/alsa-lib/libasound_module_pcm_smartx.so"
	}
  After the pcm.smartx block.
- This is key to ensure that ALSA and AVBSH are able to communicate with each
  other.

Create shared memory for the smartx plugin

$ sudo mkdir /run/smartx $ sudo chown :ias_audio /run/smartx $ sudo chmod 2770 /run/smartx

  • This will be lost on a reboot.

Insert igb_avb kernel module

$ sudo modprobe -r igb (If upstream igb driver exists) $ sudo insmod deps/igb_avb/kmod/igb_avb.ko tx_size=1024 $ sudo chmod 660 /dev/igb_avb $ sudo chgrp ias_avb /dev/igb_avb $ sudo chmod 660 /dev/ptp* $ sudo chgrp ias_avb /dev/ptp*

If the module igb_avb is loaded by default on boot, reinsert the module:

$ rmmod igb_avb $ sudo insmod /lib/modules//kernel/drivers/staging/igb_avb/igb_avb.ko tx_size=1024

Start the DLT daemon (for logging and tracing)

$ dlt-daemon -d (to daemonize)

# Start the PTP daemon #

- On Master
$ daemon_cl <I210 interface name> -G ias_avb -R 200 -GM &> /tmp/daemon_cl.log &

- On Slave
$ daemon_cl <I210 interface name> -G ias_avb -R 200 -S &> /tmp/daemon_cl.log &

# Run the AVBSH demo #

- On Master
for local lib path
$ avb_streamhandler_demo -c -s pluginias-media_transport-avb_configuration_reference.so setup --target GrMrb -p MRB_Master_Audio -n <I210 interface name> &> /tmp/avbsh.log &

- On Slave
$ avb_streamhandler_demo -c -s pluginias-media_transport-avb_configuration_reference.so setup --target GrMrb -p MRB_Slave_Audio -n <I210 interface name> &> /tmp/avbsh.log &

# Finally, transfer an audio stream w/ aplay #

- On Master
$ aplay -D avb:stereo_0 <wav file>
	
- On Slave
$ aplay -C -f dat -D avb:stereo_0 record.wav
	  (quit with ^C once the master is done playing)

### Testing video stream

Load igb_avb driver and run gPTP deamon following instructions above. Then,
run AVBSH demo:

- On Master
$ avb_streamhandler_demo -c -s
  pluginias-media_transport-avb_configuration_reference.so setup --target GrMrb
  -p <video-profile-master> -n <I210 interface name> &> /tmp/avbsh.log &

- On Slave
$ avb_streamhandler_demo -c -s
  pluginias-media_transport-avb_configuration_reference.so setup --target GrMrb
  -p <video-profile-slave> -n <I210 interface name> &> /tmp/avbsh.log &

Note that <video-profile-master> can be `Video_POC_Master` for H.264 or
`Video_POC_MpegTs_Master` for MPEG-TS, and `Video_POC_Slave` for H.264 or
`Video_POC_MpegTs_Slave` for MPEG-TS on slave.

Then, run the `avb_video_debug_app`:

- On Master (for H.264)
$ sudo build/avb_video_debug_app -h -s
or (for MPEG-TS)
$ sudo build/avb_video_debug_app -m -s


- On Slave (for H.264)
$ sudo build/avb_video_debug_app -h -r
or (for MPEG-TS)
$ sudo build/avb_video_debug_app -m -r

Output should contain messages about sending (or receiving) packets with
success.

### Running the Systemd Watchdog

AVB streamhandler watchdog is built as a static library. Currently, 3
AVB streamhandler threads - Transmit sequencer, Alsa Worker and Receive
engine,  register themselves with the watchdog manager. These can be
enabled by passing "-k watchdog.enable=1" to avb_streamhandler_demo.

Since we're relying on Systemd watchdog to reset AVB streamhandler
if any of the three threads stop resetting the watchdog timer,the
AVB streamhandler needs to be run as a Systemd service. A sample
Systemd service file is described below.

* Systemd service file. Place this at /etc/systemd/system/avb.service

[Unit] Description=AVBSH for watchdog testing

[Service] Type=simple Environment="LD_LIBRARY_PATH=$AVB_DEPS/lib/" ExecStart=/avb_streamhandler_demo -c -v -s pluginias-media_transport-avb_configuration_reference.so setup --target GrMrb -p MRB_Slave_Audio -n enp4s0 -k watchdog.enable=1 WatchdogSec=30 Restart=always


* Start/stop or check the status of the AVB streamhandler service with:
  • sudo systemctl start avb.service
  • sudo systemctl status avb.service
  • sudo systemctl stop avb.service

* To view watchdog specific logs:
  • sudo journalctl -fu avb.service | grep watchdog

### Testing video streams with gstreamer elements

AVB-SH also provides a GStreamer plugin with two elements, one sink and
one source that transmit and receive, respectively, video to and from the
network.

Plugin file is `libias-media_transport-gst_avb_video_plugin.so` and its
two elements are `avbvideosink` and `avbvideosrc`. The `avbvideosink`
element is the last element on a GStreamer pipeline on the talker, and the
`avbvideosrc` element is the first on a GStreamer pipeline on the
listener.

They are only built if GStreamer is available during build time. To run
them, it is necessary to run `avb_streamhandler_demo` as described on
previous section, for the MPEG-TS use case (currently, the elements are
only compatible with MPEG-TS streams). Then, run a GStreamer pipeline with
`gst-launch`, for instance:

- On Master
$ LD_LIBRARY_PATH=$AVB_DEPS/lib/:. GST_PLUGIN_PATH=./build gst-launch-1.0 videotestsrc pattern=ball ! clockoverlay ! vaapih264enc ! mpegtsmux ! avbvideosink

- On Slave
$ LD_LIBRARY_PATH=$AVB_DEPS/lib/:. GST_PLUGIN_PATH=./build gst-launch-1.0 avbvideosource ! typefind ! tsdemux ! decodebin ! videoconvert ! clockoverlay halignment=right ! xvimagesink display=:0

The slave should show on the X display 0 (normally, the default one) a
GStreamer window with the GStreamer "ball" video source pattern. Two
clocks are also show: the one on the left comes from Master, the one on
the right is added on the Slave pipeline.

Both elements have a property "stream-name" that can be used to define
which stream, configured in AVB-SH, the element will use. This allows a
second stream to be sent. Using the same setup as before, it's possible to
open one more stream using:

- On Master
$ LD_LIBRARY_PATH=$AVB_DEPS/lib/:. GST_PLUGIN_PATH=./build gst-launch-1.0 videotestsrc pattern=ball ! clockoverlay ! vaapih264enc ! mpegtsmux ! avbvideosink stream-name=media_transport.avb.mpegts_streaming.2

- On Slave
$ LD_LIBRARY_PATH=$AVB_DEPS/lib/:. GST_PLUGIN_PATH=./build gst-launch-1.0 avbvideosource stream-name=media_transport.avb.mpegts_streaming.8 ! typefind ! tsdemux ! decodebin ! videoconvert ! clockoverlay halignment=right ! xvimagesink display=:0

And one can see another window displaying.

## Security issues

Please report any security issues with this code to https://www.intel.com/security