Olle E. Johansson wrote:
On 08 Apr 2014, at 13:32, Joshua Colp<jc...@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.
--
Joshua Colp
Digium, Inc. | Senior Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
Check us out at: www.digium.com & www.asterisk.org
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