[asterisk-users] Asterisk codecs retranslation

[Alexandr Olekhnovich]

Thank you very much

On 4/23/07, Nicholas Campion <campnic at gmail.com> wrote:
>
> It looks like the section you want to look at is channel.c:set_format(line 2808).  My understanding is that chan->nativeformats is set to the
> format that the channel was created in (GSM for instance) and fmt is set to
> the codec we are trying to accept audio from or write audio to.  The
> important line is "res = ast_translator_best_choice(&fmt, &native);" this is
> where the channel object is trying to determine what the best translation
> path (sequence of translations) is for fmt to native (the channels format).
> translate.c:ast_translator_best_choice (line 787) determines what the
> sequence of translations will be, but if (*dst) & (*srcs) (the codecs are
> common/ the same), then you can see that it returns that the codecs are
> already matching.  (See the comment on 802:"/* We are done, this is a common
> format to both. */")
>
> I had no prior knowledge of this problem.  Looking at the source code is
> really the only way to get more than comments which are someones
> understanding.
>
> Good luck,
> Nick
>
> On 4/23/07, Alexandr Olekhnovich <a.olekhnovich at gmail.com> wrote:
> >
> > It's your understanding and mine, but I need to know exactly. It's not
> > easy to check.
> >
> > On 4/23/07, Nicholas Campion < campnic at gmail.com> wrote:
> > >
> > > No.  My understanding is that codec translation only takes place when
> > > the codecs are not the same OR if asterisk is recording the conversation.
> > > (The second situation may not require conversion either)
> > >
> > > On 4/23/07, Alexandr Olekhnovich <a.olekhnovich at gmail.com> wrote:
> > >
> > > > Hello, everyone.
> > > > I'm interested in one thing: as I know asterisk retranslates the
> > > > media stream with the next way
> > > > 1. Gets the frame with the UA1's codec
> > > > 2. Retranslates it to slan
> > > > 3. Ratranslates slan to UA2's codec
> > > > 4. Send the frame
> > > > It seems to me, that it follows these steps anyway, the question is:
> > > > Will Asterisk retranslate the frame ua1->slin->au2, if the codecs of
> > > > the 1-st user and the 2-nd are the same? I need him do not touch the frames,
> > > > just retransmit them as is.
> > > >
> > > > --
> > > > Best Regards
> > > > Alexander Olekhnovich
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> > --
> > Best Regards
> > Alexander Olekhnovich
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-- 
Best Regards
Alexander Olekhnovich
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