Tuesday, 9 September 2014

Controlling an AVB network from a Raspberry Pi

I’ve been playing with Audio Video Bridging (https://www.xmos.com/applications/avb) quite a bit lately and historically I’ve always used the AVDECC-Lib controller (https://github.com/audioscience/avdecc-lib) running on my laptop, either under Windows or Linux.

My intention is to create a completely standalone demo so I’ve since compiled the AVDECC-Lib controller for my Raspberry Pi.

The first thing to do is ensure that the GCC compiler is v4.7 :

sudo apt-get install g++-4.7
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.6 60 --slave /usr/bin/g++ g++ /usr/bin/g++-4.6 
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.7 40 --slave /usr/bin/g++ g++ /usr/bin/g++-4.7 
sudo update-alternatives --config gcc

Next we need to ensure that we have all of the required applications and modules :

sudo apt-get install cmake
sudo apt-get install git
sudo apt-get install libpcap-dev
sudo apt-get install libreadline-dev

Now we clone AVDECC-Lib from github :

git clone git://github.com/audioscience/avdecc-lib --recursive

Finally we build the library and application :

cd avdecc-lib
cmake .
make

Now we can run the controller and manage our AVB network :

sudo controller/app/cmdline/avdecccmdline

Note, it is necessary to use sudo because the application requires direct access to the Ethernet PHY.
The controller will now give you a list of network interfaces and you need to choose the appropriate one (2).

AVDECC Controller version: v0.4.9
1 (lo, address: <127.0.0.1>)
2 (eth0, address: <192.168.128.180>)
Enter the interface number (1-2): 2

That’s it, we are now at the controller command line :

Enter "help" for a list of valid commands.
$


4 comments:

  1. Hello, I've been trying to make this work but being a Noob have run into dificulties.
    The first problem is this string:git clone git://github.com/audioscience/avdecc-lib --recursive
    I think its been moved so I used this:git clone https://github.com/audioscience/avdecc-lib.git
    Which works up until i go to make and then I get:

    pi@raspberrypi ~/avdecc-lib $ make
    Scanning dependencies of target controller
    [ 2%] Building CXX object controller/lib/CMakeFiles/controller.dir/src/control_ descriptor_imp.cpp.o
    In file included from /home/pi/avdecc-lib/controller/lib/src/entity_descriptor_i mp.h:32:0,
    from /home/pi/avdecc-lib/controller/lib/src/end_station_imp.h:3 3,
    from /home/pi/avdecc-lib/controller/lib/src/control_descriptor_ imp.cpp:33:
    /home/pi/avdecc-lib/controller/lib/src/descriptor_base_imp.h:36:29: fatal error: jdksavdecc_util.h: No such file or directory
    compilation terminated.
    controller/lib/CMakeFiles/controller.dir/build.make:54: recipe for target 'contr oller/lib/CMakeFiles/controller.dir/src/control_descriptor_imp.cpp.o' failed
    make[2]: *** [controller/lib/CMakeFiles/controller.dir/src/control_descriptor_im p.cpp.o] Error 1
    CMakeFiles/Makefile2:93: recipe for target 'controller/lib/CMakeFiles/controller .dir/all' failed
    make[1]: *** [controller/lib/CMakeFiles/controller.dir/all] Error 2
    Makefile:72: recipe for target 'all' failed
    make: *** [all] Error 2

    Can you tell me what I'm doing wrong?

    Thanks

    Geoff

    ReplyDelete
  2. Hi Geoff, You can do it that way but the error is the missing sub library jdksavdecc. You need the --recursive or you will need to clone the library separately, as per the AVDECC-Lib readme : https://github.com/audioscience/avdecc-lib/blob/master/README.md
    All the best,
    John

    ReplyDelete
  3. Hi John,

    Thanks for getting back to me. I will try that and let you know how I get on!

    ReplyDelete
  4. Can I use this to stream Audio from my Raspberry Pi to an AVB network?

    ReplyDelete