Compiling g729 codecs for ARM on Raspberry Pi B+ with bcg729

24/08/2014 - 05:32 by poney

In order to compile the g729 codec for a Raspberry Pi B+ (ARM processor), the fastest way is to build it with the bcg729. The bcg729 is a software encoder for g729a and decoder library written from scratch.

The resulting codec will be x2 slower than if it has been compiled with IPP.

System information

The following steps are performed on the Arch Linux installed on a Raspberry Pi B+

$ uname -a
Linux alarmpi 3.12.24-1-ARCH #1 PREEMPT Thu Jul 10 23:57:15 MDT 2014 armv6l GNU/Linux

$ cat /proc/cpuinfo
processor      : 0
model name     : ARMv6-compatible processor rev 7 (v6l)
Features       : swp half thumb fastmult vfp edsp java tls
CPU implementer        : 0x41
CPU architecture: 7
CPU variant    : 0x0
CPU part       : 0xb76
CPU revision   : 7

Hardware       : BCM2708
Revision       : 0010
Serial         : 000000000e2fc80c

Temporary tmpfs work dir

In order to avoid a heavy usage of the sdcard, it is possible to build a temporary tmpfs folder for compilation

$ cd /tmp
$ mkdir tmpfs
$ sudo mount -t tmpfs tmpfs tmpfs
$ cd tmpfs

Compiling bcg729

After that, we compile the bcg729 library. The default output path of the library files should be changed to /lib as Asterisk can not find it when loading the g729 codec

$ wget http://download-mirror.savannah.gnu.org/releases/linphone/plugins/sources/bcg729-1.0.0.tar.gz
$ tar xzf bcg729-1.0.0.tar.gz
$ cd bcg729-1.0.0
$ ./configure --libdir=/lib
$ make
$ sudo make install

Compiling g729 codecs

The next step is to compile the g723 and g729 codecs with bcg729 and copy them to /usr/lib/asterisk/modules folder

$ wget http://asterisk.hosting.lv/src/asterisk-g72x-1.2.tar.bz2
$ tar xjf asterisk-g72x-1.2.tar.bz2
$ cd asterisk-g72x-1.2
$ ./autogen.sh
$ ./configure --with-bcg729
$ make
$ sudo make install

Testing

And finally

$ sudo systemctl asterisk restart

$ sudo asterisk -rvvv
alarmpi*CLI> core show translation recalc 10
         Recalculating Codec Translation (number of sample seconds: 10)

         Translation times between formats (in microseconds) for one second of data
          Source Format (Rows) Destination Format (Columns)

            gsm  ulaw  alaw  g726 adpcm  slin lpc10  g729  ilbc g726aal2  g722 slin16 testlaw slin12 slin24 slin32 slin44 slin48 slin96 slin192
      gsm     - 15000 15000 15000 15000  9000 15000 15000 15000    15000 17250  17000   15000  17000  17000  17000  17000  17000  17000   17000
     ulaw 15000     -  9150 15000 15000  9000 15000 15000 15000    15000 17250  17000   15000  17000  17000  17000  17000  17000  17000   17000
     alaw 15000  9150     - 15000 15000  9000 15000 15000 15000    15000 17250  17000   15000  17000  17000  17000  17000  17000  17000   17000
     g726 15000 15000 15000     - 15000  9000 15000 15000 15000    15000 17250  17000   15000  17000  17000  17000  17000  17000  17000   17000
    adpcm 15000 15000 15000 15000     -  9000 15000 15000 15000    15000 17250  17000   15000  17000  17000  17000  17000  17000  17000   17000
     slin  6000  6000  6000  6000  6000     -  6000  6000  6000     6000  8250   8000    6000   8000   8000   8000   8000   8000   8000    8000
    lpc10 15000 15000 15000 15000 15000  9000     - 15000 15000    15000 17250  17000   15000  17000  17000  17000  17000  17000  17000   17000
     g729 15000 15000 15000 15000 15000  9000 15000     - 15000    15000 17250  17000   15000  17000  17000  17000  17000  17000  17000   17000
     ilbc 15000 15000 15000 15000 15000  9000 15000 15000     -    15000 17250  17000   15000  17000  17000  17000  17000  17000  17000   17000
 g726aal2 15000 15000 15000 15000 15000  9000 15000 15000 15000        - 17250  17000   15000  17000  17000  17000  17000  17000  17000   17000
     g722 15600 15600 15600 15600 15600  9600 15600 15600 15600    15600     -   9000   15600  17500  17000  17000  17000  17000  17000   17000
   slin16 14500 14500 14500 14500 14500  8500 14500 14500 14500    14500  6000      -   14500   8500   8000   8000   8000   8000   8000    8000
  testlaw 15000 15000 15000 15000 15000  9000 15000 15000 15000    15000 17250  17000       -  17000  17000  17000  17000  17000  17000   17000
   slin12 14500 14500 14500 14500 14500  8500 14500 14500 14500    14500 14000   8000   14500      -   8000   8000   8000   8000   8000    8000
   slin24 14500 14500 14500 14500 14500  8500 14500 14500 14500    14500 14500   8500   14500   8500      -   8000   8000   8000   8000    8000
   slin32 14500 14500 14500 14500 14500  8500 14500 14500 14500    14500 14500   8500   14500   8500   8500      -   8000   8000   8000    8000
   slin44 14500 14500 14500 14500 14500  8500 14500 14500 14500    14500 14500   8500   14500   8500   8500   8500      -   8000   8000    8000
   slin48 14500 14500 14500 14500 14500  8500 14500 14500 14500    14500 14500   8500   14500   8500   8500   8500   8500      -   8000    8000
   slin96 14500 14500 14500 14500 14500  8500 14500 14500 14500    14500 14500   8500   14500   8500   8500   8500   8500   8500      -    8000
  slin192 14500 14500 14500 14500 14500  8500 14500 14500 14500    14500 14500   8500   14500   8500   8500   8500   8500   8500   8500       -
alarmpi*CLI>

Voila,

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