[Freeswitch-dev] VAD, TALK and NOTALK events

Thu Feb 14 14:51:55 EST 2008

Hi,

    I ma interested in the VAD algorithm used 
where where is the code exactly? maybe a link any 
document support about the vad alogorithm used therein?

    thanks,


Zelda


At 01:47 14/02/2008, Anthony Minessale wrote:
>They are enabled by the vad params in the sofia profile xml
><param name="vad">
>
>
>Anthony Minessale II
>
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>
>----- Original Message ----
>From: Cesar Cepeda <cesar at auronix.com>
>To: freeswitch-dev at lists.freeswitch.org
>Sent: Wednesday, February 13, 2008 10:17:23 AM
>Subject: Re: [Freeswitch-dev] VAD, TALK and NOTALK events
>
>Please correct me if I’m wrong.
>
>
>
>The events are indeed fired, but only if the 
>SWITCH_VAD_FLAG_EVENTS_TALK or NOTALK flags are 
>set for an rtp_session.   I found no place in 
>the code where those flags are set.  That is 
>what I meant by not  being “enabled”.
>
>
>
>I subscribed to the events and received 
>nothing.  Then I set the flags on 
>switch_rtp_enable_vad function, and then I 
>started receiving the events.  Perhaps there is 
>another way of doing it that I’m missing.
>
>
>
>Cesar Cepeda.
>
>
>
>
>
>
>
>De: freeswitch-dev-bounces at lists.freeswitch.org 
>[mailto:freeswitch-dev-bounces at lists.freeswitch.org] 
>En nombre de Anthony Minessale
>Enviado el: Miércoles, 13 de Febrero de 2008 08:17
>Para: freeswitch-dev at lists.freeswitch.org
>Asunto: Re: [Freeswitch-dev] VAD, TALK and NOTALK events
>
>
>
>The events are fired.
>I don't know what you mean by "enabled"
>
>You can either bind an event to a callback
>in the load function of your custom module.
>
>or connect to mod_event_socket on tcp
>and request "events talk notalk"
>
>void my_event_handler(switch_event_t *event)
>{
>
>}
>
>if (switch_event_bind(modname, 
>SWITCH_EVENT_TALK, SWITCH_EVENT_SUBCLASS_ANY, my_event_handler, NULL)
>         != SWITCH_STATUS_SUCCESS) {
>         switch_log_printf(SWITCH_CHANNEL_LOG, 
> SWITCH_LOG_ERROR, "Couldn't bind!\n");
>         return SWITCH_STATUS_GENERR;
>     }
>
>if (switch_event_bind(modname, 
>SWITCH_EVENT_NOTALK, SWITCH_EVENT_SUBCLASS_ANY, my_event_handler, NULL)
>         != SWITCH_STATUS_SUCCESS) {
>         switch_log_printf(SWITCH_CHANNEL_LOG, 
> SWITCH_LOG_ERROR, "Couldn't bind!\n");
>         return SWITCH_STATUS_GENERR;
>     }
>
>
>
>Anthony Minessale II
>
>FreeSWITCH <http://www.freeswitch.org/>http://www.freeswitch.org/
>ClueCon <http://www.cluecon.com/>http://www.cluecon.com/
>
>AIM: anthm
>MSN:anthony_minessale at hotmail.com
>GTALK/JABBER/PAYPAL:anthony.minessale at gmail.com
>IRC: <http://irc.freenode.net>irc.freenode.net #freeswitch
>
>
>FreeSWITCH Developer Conference
>sip:888 at conference.freeswitch.org
>iax:guest at conference.freeswitch.org/888
>googletalk:conf+888 at conference.freeswitch.org
>pstn:213-799-1400
>
>
>
>----- Original Message ----
>From: Cesar Cepeda <cesar at auronix.com>
>To: freeswitch-dev at lists.freeswitch.org
>Sent: Tuesday, February 12, 2008 6:53:03 PM
>Subject: [Freeswitch-dev] VAD, TALK and NOTALK events
>
>Hi,
>
> >From looking at the code of switch_rtp.c  I can see that VAD is done if
>enabled in the sip profile in order to not send packets when there is no
>noise. There are also two events {TALK, NOTALK} which can be fired when VAD
>kicks in, nevertheless these two events are enabled nowhere (or at least I
>didn't find a place in the code where they were enabled), so no matter if
>you ask for them you don't receive them.  My questions are the following:
>
>Is there some particular reason for not enabling these two events?
>Is the event queue easily overflowed if these two events are enabled?
>
>Thanks.
>
>Cesar Cepeda.
>
>
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