[asterisk-dev] Audiohook dropping frames

Olle E. Johansson oej at edvina.net
Tue Apr 8 06:50:39 CDT 2014

On 08 Apr 2014, at 13:45, Joshua Colp <jcolp at digium.com> wrote:

> Olle E. Johansson wrote:
>> On 08 Apr 2014, at 13:32, Joshua Colp<jcolp at digium.com>  wrote:
>>> Olle E. Johansson wrote:
>>>> Hi!
>>> Kia ora,
>>>> In my adventures with silence detection and suppression I want
>>>> my audiohook to drop frames. I see that I can manipulate but can
>>>> I also drop frames?
>>> Right now the manipulation expects the contents of the audio frame
>>> to be changed, not the entire frame itself to be changed of type so
>>> two things come to mind:
>>> 1. Change the frame enough to make it seem as though it does not
>>> contain any audio. Changing datalen for example.
>>> 2. Make it so manipulate can return NULL to indicate it has
>>> suppressed the frame. This shouldn't be that bad. The audiohook got
>>> just has to replace the frame with&ast_null_frame if a manipulation
>>> audiohook returns NULL.
>> 3. Invent AST_FRAME_DROP and make sure that we drop it instead of
>> sending it out to network...
> That's what &ast_null_frame is for. It's a globally created frame which is used to replace frames with nothing or return a frame when no real frame exists to return. It just passes through stuff and nothing happens with it, since it contains er well nothing. Since it is globally created it also doesn't incur a memory allocation in most cases.

Right. What you mean is that there's no way around it, just go for option #2 and do what Josh says again... ;-)

My DSP doesn't do what I want it to. Something happened along the way...

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