Re: VAD in pjmedia

[Gabor K <gabor58k@xxxxxxxxx>]

Hi,

some background information:

my task is to control a voice recorder:
incoming rtp stream has to be stored in wav file only in case of voice activity can be observed on the incoming stream.

Regarding to VAD I have found the following pjsip Forum entry from 2008:

Tue Apr 8 06:38:38 EDT 2008

Hi Markus,

Assuming you are talking about microphone silence detection,
currently there is no callback/trigger mechanism for silence detection.

However, you have some alternatives to do this:

1. Monitor the rx_level of sound port (normally slot 0) in the
conference periodically.
See pjmedia_conf_get_signal_level() API.

2. Implement a pjmedia port that utilize existing silence detector to
do callback when such conditions are reached (e.g: start silence, start talking).
Then, this port can be stacked to any port you would like to monitor
(in this case, sound port). The port connection will be about:
conference bridge <--> silencedet port <--> sound port.

We will be glad if somebody would implement the second alternative and
share the implementation to us.

Regards,
Nanang

Nanang,
regarding to "Alternative 2": have been already implemented any enhancements since 2008?

If yes: can you give me some links where to find them and some examples how to integrate it?

If no: can you give me some more details on pjmedia port implementation to utilize the existing silence detector?

Thank you in advance:

Gabor

On Fri, Jun 16, 2017 at 12:06 PM, Gabor K <gabor58k@xxxxxxxxx> wrote:

Hi,

I am wondering how to use/integrate Voice Activity Detector of pj's codecs, e.g.: G.711.

I have found the pjmedia_silence_det_detect() API but I can not find any example code which shows how to use it.

Can you give me some pointers or some short advises?

Thank you.

Gabor

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