[pjsip] stop recording when silence is detected

[Nanang Izzuddin]

Hi,


Yes, I think you can use the Adaptive Silence Detection [1], and
create a simple media port just to filter the silence before the file
writer, and perhaps a simple counter to decide if EOF is reached
(after some contiguous silence frames). Here is a sample diagram:

input (e.g: audio dev/file reader/conf bridge) -> custom media port
(with silence detector) -> file/mem writer.

[1] http://www.pjsip.org/pjmedia/docs/html/group__PJMEDIA__SILENCEDET.htm

Regards,
nanang


On Wed, Mar 11, 2009 at 8:52 PM, Wayne Waldner <wpwaldner at hotmail.com> wrote:
> It is common in IVR type applications to allow recording to stop
> automatically if silence of (n) seconds is detected.  When using the File
> Writer (Recorder), can anyone suggest a way to stop recording when a given
> amount of silence has been detected?  I presume one could use the Adaptive
> Silence Detection algorithm, but not sure if I am on the right track on
> this.  If the Silience Detection algorithm is used, would one have to record
> to memory buffer and ‘pipe’ the pcm data into the algorithm?  Perhaps a
> special media port has to be created to implement this functionality.  Any
> ideas?
>
>
>
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