Intel IPP audio codecs including G.729 and G.723.1 adapted for Asterisk
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Revision SVN 8
- fix documentation
- diff at proper level

Revision SVN 6
- convert to using subversion
- update the documentation
- support for Asterisk 1.2.x

Revision 1.7 (2006-09-03)
- update Intel filenames in documentation, use IPP 4.1.2 instead of 4.1

Revision 1.6 (2005-09-03)
- unified G.723.1 and G.729 patches into a single diff, so you can
  study both more easily
- fix memory leak - thanks to Rafael for spotting the missing `!' in Intel's
- compile the command line encoder and decoder for G.729 such that
  they produce raw G.729 rather than ITU demonstration bitstreams.
- add Debian packaging files
- add

Revision 1.5
- and libimf.a notes

Revision 1.4
- static linking
- compiler optimizations

Revision 1.3
- added Intel links
- fixed patch command
- added notes about build dependencies


- This code has been compiled with gcc 4.  To use with gcc 3, you may need
  to change the `-mtune' to `-mcpu' in makeopts, and some other small

Step 1a
Download the code from Intel

cd /tmp

Step 1b

Install Asterisk header files

On Debian, just type

  apt-get install asterisk-dev
  apt-get build-dep asterisk

Specifically, you need the *.h files that come with Asterisk

Step 2a

Register with Intel


a) register on Intel's site under the 'free non-commercial use' section
b) obtain the license number and a license key file
c) put the license key file in the place specified by Intel's documentation
d) run the installer

Step 2b

Install IPP libraries.

(For more detailed help with this stage, see )

mkdir /tmp/ipp-tmp
cd /tmp/ipp-tmp
tar xf /tmp/l_ipp_ia32_itanium_p_4_1_2.tar

Follow Intel's instructions to install IPP.  If using Debian, the Intel
installed will stop half way, leaving a .rpm file sitting in a subdirectory
of /tmp.  You can install the .rpm file using `alien' and then proceed.

Intel's instructions and licensing information (including Open Source
version information) are at

Once you've installed IPP and agreed to the license terms, you may need to
copy the libraries from one PC to another (eg, from your development machine
to a production server).  You just need to copy the contents of the following


without re-running the install process.

If you use static linking (now the default method), you DON'T need to 
copy the libraries onto every computer where you run the codec.  You 
only need the libraries on the computer where you compile the codec.

Step 3

Install IPP sample code

cd /usr/local/src
tar xzf /tmp/l_ipp-sample-speech-coding_p_4.1.008.tgz

Step 4

Apply my patch

cd ipp_sample/
patch -p0 < /tmp/ipp-svn8.diff

Step 4a

Select compiler optimizations

vi speech-coding/makeopts

Note: if you optimize for a more modern processor than the processor
in your machine, the codec will not run and Asterisk will not start.
The default is Pentium 4.  If you have a Pentium III, you must change
the optimizations.

Step 5a

If you have icc 8.0 libimf, move intel_cc_80/lib/ to 
somewhere out of the way.  This will allow you to link libimf.a
statically with

Step 5b

* New:                               *
* If NOT using Debian:               *
*   chmod a+x               *
*   ./                       *
* or                                 *
*   chmod a+x               *
*   ./ install               *
*                                    *
* If you are using Debian:           *
*                                    *
*  chmod a+x debian/rules   *
*  dpkg-buildpackage -rfakeroot      *

Step 6


cp codec_g72*.so /usr/lib/asterisk/modules   
   (the target location depends on your system)

or just do ./ install

or if using Debian, dpkg -i ../asterisk-ipp-codecs_1.0-1_i386.deb

If you haven't used static linking (now the default),
modify /etc/init.d/asterisk:

export LD_LIBRARY_PATH=/opt/intel/ipp41/ia32_itanium/sharedlib:/opt/intel/ipp41/ia32_itanium/sharedlib/linux32:$LD_LIBRARY_PATH

You may need to insert the following into your 
sip.conf, iax.conf, h323.conf, etc:


Now restart Asterisk

/etc/init.d/asterisk restart

Step 7

Verify install

At the shell prompt:
# asterisk -r

At the Asterisk prompt:
>show translation

If the G.723.1 and G.729 columns have -'s instead of numbers, then 
the codecs are not working properly.


G.729 only at present

Do you want to record greetings and IVR messages in G.729 format so
that your CPU doesn't have to transcode every time a call takes place?

Most likely, yes, you do want this.

Now you can.  The original Intel command line encoder and decoder utilities
(g729fpencoder and g729fpdecoder) work with bitstream files in a
special format used by the ITU test suite.  This is not the same format
that Asterisk expects when reading/writing raw G.729.

The utilities `my_enc' and `my_dec' have been designed to work
with the raw format.  Files generated by `my_enc' can be read by Asterisk
without any transcoding.


	my_enc audio.raw audio.g729

	my_dec audio.g729 audio.raw

	audio.raw must be 
		- 16 bit signed linear audio, 
		- mono, 
		- 8000Hz sample rate

To convert a WAV file into the raw uncompressed audio before feeding it
to `my_enc', you would use the `sox' utility (available on all Unix systems):

	sox audio.wav -t raw -r 8000 -s -w -c 1 audio.raw

To convert a GSM file (such as those distributed with Asterisk), do:

	sox audio.gsm -t raw -r 8000 -s -w -c 1 audio.raw