[Freeswitch-users] G729

[Steven Ayre]

Annex A is just an alternative way of encoding the data, using less
processing power but at poorer quality. They generate compatible data -
decoders both with and without annex a support decode both G729 and G729A
encoded data. The difference is purely in the implementation of the
encoder/decoder. If your device uses G729A in the SDP, it's broken.

Annex B uses the same PT & name. It does work in passthrough mode, as does
plain G729.

-Steve


On 8 February 2011 15:31, curriegrad2004 <curriegrad2004 at gmail.com> wrote:

> G729 only. No A's or AB.
>
> If you want to pass through other variants of G.729, you can simply
> modify mod_g729.c to include additional variants of G729
>
> Which by the way, I've pasted the area of the code you might want to
> modify. I've done this on mine and it worked fine as pass through.
>
> 00217         SWITCH_ADD_CODEC(codec_interface, "G.729A");
> 00218         for (count = 12; count > 0; count--) {
> 00219                 switch_core_codec_add_implementation(pool,
> codec_interface,
> 00220
>                        SWITCH_CODEC_TYPE_AUDIO, 18, "G729A", NULL,
> 8000, 8000, 8000,
> 00221
>                        mpf * count, spf * count, bpf * count, ebpf *
> count, 1, count * 10,
> 00222
>                        switch_g729_init, switch_g729_encode,
> switch_g729_decode, switch_g729_destroy);
> 00223         }
>
>
> On Tue, Feb 8, 2011 at 7:02 AM, Sam <u2nsam at gmail.com> wrote:
> > Hi,
> >
> > Which type of  G.729 codec does freeswitch uses in passthrough mode ?
> > Is it g729a or g729b or g729ab .
> >
> > Regards
> > Sam
> >
> >
> >
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