Introduction

I have begun to port ITU g729a codec implementation on iPhone OS. I report below the performance and conformance between ITU reference implementation and my optimization.

For the moment the code is not released, but now the library is integrated in Siphon and it works fine(because I haven't finished to integrate in Siphon). Normally, a new version of Siphon should be released in September with g729a support.

g729a

Performance

All tests have been realized on iPhone 1 with iPhone OS 2.2.1

Coder

coder g729a ITU (reference)

	sample.pcm	speech.pcm
Frame	1969	3749
real	0m8.580s	0m15.902s
user	0m7.990s	0m15.110s
sys	0m0.140s	0m0.190s

coder g729a optimized

	sample.pcm	speech.pcm
Frame	1969	3749
real	0m3.217s	0m5.939s
user	0m2.990s	0m5.670s
sys	0m0.050s	0m0.080s

Decoder

decoder g729a ITU (reference)

	sample.pcm	speech.pcm
Frame	1969	3749
real	0m1.865s	0m3.498s
user	0m1.740s	0m3.250s
sys	0m0.050s	0m0.080s

decoder g729a optimized

	sample.pcm	speech.pcm
Frame	1969	3749
real	0m0.652s	0m1.576s
user	0m0.520s	0m0.990s
sys	0m0.070s	0m0.070s

References

	coder	decoder	Description
algthm	ok	ok	conditional parts of the algorithm
erasure	N/A	ok	frame erasure recovery
fixed	ok	ok	fixed codebook search
lsp	ok	ok	lsp quantization
overflow	N/A	ok	overflow detection in synthesizer
parity	N/A	ok	parity check
pitch	ok	ok	pitch search
speech	ok	n/A	generic speech file
tame	ok	ok	taming procedure

Platform

iPhone or iPod Touch, with arm ARM1176JZF.

g729b or g729ab

Next step.

Comment by tijuanas...@gmail.com, May 30, 2010

Please let me know when this has been completed. I have been waiting for a g729.

Best Regards,

steve Tijuanasteve@gmail.com

Comment by sweis...@gmail.com, Jul 11, 2010

Is this a fixed-point implementation? Could this be integrated with pjsip?

Comment by d.sarava...@gmail.com, May 15, 2012

how to compile SILK codec for ios?

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