Anthony,
That begs the question – do we have VAD
(or AMD or FMD) on other endpoints? Specifically I’d be interested in knowing
about OpenZAP. Can it or is there any kind of machine detection or human
detection (like Asterisk’s AMD app) for OZ or any other endpoints capable of
dialing an outbound call?
Thanks,
MC
From:
freeswitch-dev-bounces@lists.freeswitch.org
[mailto:freeswitch-dev-bounces@lists.freeswitch.org] On Behalf Of Anthony Minessale
Sent: Friday, February 15, 2008
6:09 AM
To:
Subject: Re: [Freeswitch-dev] VAD,
TALK and NOTALK events
The algorithm used is not so great
and could stand to be replaced
by a better one if we get the chance.
basically we decode the audio to signed linear 16bit samples
for each packet we receive and iterate the samples and add up the
absolute values then compute the average and compare it to the
acceptable level considered "talking" then we use a counter to make
sure it's in the same state several times in a row before actually
changing the status of the channel to talking or not talking.
A real vad algorithm would also be able to filter out the voice from
the background noise and judge the energy based only on that.
Anthony Minessale II
FreeSWITCH http://www.freeswitch.org/
ClueCon http://www.cluecon.com/
AIM: anthm
MSN:anthony_minessale@hotmail.com
GTALK/JABBER/PAYPAL:anthony.minessale@gmail.com
IRC: irc.freenode.net #freeswitch
FreeSWITCH Developer Conference
sip:888@conference.freeswitch.org
iax:guest@conference.freeswitch.org/888
googletalk:conf+888@conference.freeswitch.org
pstn:213-799-1400
----- Original Message ----
From: KMTDBOURSE <kmtdbourse@free.fr>
To:
Sent: Thursday, February 14, 2008 1:51:55 PM
Subject: Re: [Freeswitch-dev] VAD, TALK and NOTALK events
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
<param name="vad">
Anthony Minessale II
FreeSWITCH http://www.freeswitch.org/
ClueCon http://www.cluecon.com/
AIM: anthm
MSN:anthony_minessale@hotmail.com
GTALK/JABBER/PAYPAL:anthony.minessale@gmail.com
IRC: irc.freenode.net
#freeswitch
FreeSWITCH Developer Conference
sip:888@conference.freeswitch.org
iax:guest@conference.freeswitch.org/888
googletalk:conf+888@conference.freeswitch.org
pstn:213-799-1400
----- Original Message ----
From: Cesar Cepeda <cesar@auronix.com>
To:
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@lists.freeswitch.org [ mailto:freeswitch-dev-bounces@lists.freeswitch.org]
En nombre de Anthony Minessale
Enviado el: Miércoles, 13 de
Febrero de 2008 08:17
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/
ClueCon http://www.cluecon.com/
AIM: anthm
MSN:anthony_minessale@hotmail.com
GTALK/JABBER/PAYPAL:anthony.minessale@gmail.com
IRC: irc.freenode.net
#freeswitch
FreeSWITCH Developer Conference
sip:888@conference.freeswitch.org
iax:guest@conference.freeswitch.org/888
googletalk:conf+888@conference.freeswitch.org
pstn:213-799-1400
----- Original Message ----
From: Cesar Cepeda <cesar@auronix.com>
To:
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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