Just a proof of concept (that the DSP can be useful).

I simply took the innards of the costg711 package and placed in in a dsptask

This code is not optimised, I've no idea how fast it runs.
Things to look at are specific DSP abilities, and the overhead associated with the
memory transfer (i.e. what is the ideal size).

There are other optimisations, such as using more buffers, so that the DSP and ARM
don't have to wait while the other reads the data out and re-fills the buffer.

As I said, it's just a proof of concept.


To try it, you need to do the following:

Make the dsp task
-----------------
setup your Ti dsp toolchain
run make in this directory, 
change the module name from task_g711_ulaw_encode.o to g711_ulaw.o
move this module to /lib/dsp/modules
edit the /lib/dsp/dsp_dld_avs.conf file to look something like this:

Nokia-N800-26:/home/user# more /lib/dsp/dsp_dld_avs.conf
#
# dsp_dld.conf
# 2003-2005 Toshihiro Kobayashi, Nokia Research Center
#

$kernel /lib/dsp/avs_kernel.out
$cmd    /lib/dsp/avs_kernelcfg.cmd

# devname       taskname                pri     module                          cmd file(optional)
pcm2            _pcm2_dsptask           1       /lib/dsp/modules/pcm2.o         /lib/dsp/modules/pcm.cmd
aacdec          _aacdec_dsptask         1       /lib/dsp/modules/aac.o          /lib/dsp/modules/aac.cmd
amrnb           _amrnb_dsptask          1       /lib/dsp/modules/amrnb.o        /lib/dsp/modules/amrnb.cmd
amrwb           _amrwb_dsptask          1       /lib/dsp/modules/amrwb.o        /lib/dsp/modules/amrwb.cmd
mp3dec          _mp3dec_dsptask         1       /lib/dsp/modules/mp3.o          /lib/dsp/modules/mp3.cmd
mp2dec          _mp2dec_dsptask         1       /lib/dsp/modules/mp2.o          /lib/dsp/modules/mp2.cmd
pcm_rec         _pcm_rec_dsptask        1       /lib/dsp/modules/pcm_rec.o      /lib/dsp/modules/pcm_rec.cmd
g711_enc        _g711_enc_dsptask       1       /lib/dsp/modules/g711_enc.o     /lib/dsp/modules/g711_enc.cmd
g711_dec        _g711_dec_dsptask       1       /lib/dsp/modules/g711_dec.o     /lib/dsp/modules/g711_dec.cmd
g729_enc        _g729_enc_dsptask       1       /lib/dsp/modules/g729_enc.o     /lib/dsp/modules/g729_enc.cmd
g729_dec        _g729_dec_dsptask       1       /lib/dsp/modules/g729_dec.o     /lib/dsp/modules/g729_dec.cmd
ilbc_enc        _ilbc_enc_dsptask       1       /lib/dsp/modules/ilbc_enc.o     /lib/dsp/modules/ilbc_enc.cmd
ilbc_dec        _ilbc_dec_dsptask       1       /lib/dsp/modules/ilbc_dec.o     /lib/dsp/modules/ilbc_dec.cmd
aep             _aep_dsptask            1       /lib/dsp/modules/aep.o          /lib/dsp/modules/aep.cmd
g711_ulaw       _task_g711_ulaw         1       /lib/dsp/modules/g711_ulaw.o



Reload the dsp modules by running dsp_dld

Run the ARM-side binary like so: ./test_g711_mulaw.out ringout.wav ringout.ulaw_dsp

Run the original (all ARM-side) COST program like so: ./costg711 -lu ringout.wav ringout.ulaw_cost 

Compare the output files