[Freeswitch-dev] hooked functions are not called while using one single session

Mon Mar 22 16:23:50 PDT 2010

I have an selfmade software which is controlled by a telephone call (ISDN/CAPI). The user calls with his phone, gets 
connected and can speak commands which are detected by an internal speech recognizer. Furthermore the user can accept 
or hangup incoming calls just by his voice command. It is also possible to dial out. 

Now I am adding VOIP functionality to my system and decided to use FreeSwitch. Therefore I wrote a FreeSwitch module which should be the VOIP interface for my software. The module must be able to:

1. recognize an incoming call which is the users control session (single session)
   I do this in statehandler function channel_on_init.
2. pick up another incoming call and intercept with my users control session. 
3. Get the audio data from voip session (user control session) and send it to my application (by own tcp-socket)
    My idea is to use channel_write_frame to receive audio.
3. Send audio data from my application to voip user control session so the user can hear audio.
    My idea is to use channel_read_frame.

explanation for using hooks:
----------------------------
The endpoint interface callback functions where never called in my module, even I tried to adapt the way it is done 
in mod_portaudio. So my workaround was to set hook functions channel_read_frame/channel_write_frame to handle audio. 

My problems:
------------
The hook functions are working fine if I have 2 sessions (put together by switch_ivr_intercept_session), but if I only have the single user control session no hooked function is called. In this case the only way to achieve that hooks are called, is to play audio with switch_ivr_play_file. But then, audio samples got lost sometimes.

Maybe there is a better way to solve my requirements? 

Date: Mon, 22 Mar 2010 11:55:42 -0500
From: anthony.minessale at gmail.com
To: freeswitch-dev at lists.freeswitch.org
Subject: Re: [Freeswitch-dev] hooked functions are not called while using	one single session

Why do you even need the hooks?
What exactly are you trying to do?
Maybe you should explain it.

On Mon, Mar 22, 2010 at 5:33 AM, Francisco Scaramanga <scaram at hotmail.de> wrote:

I am now using the application interface and play a file after answering the call. The call is not connected to a another session, it's just a single session.

SWITCH_STANDARD_APP(mod_my_function)
{
     /* play audio file */

    switch_ivr_play_file(session, NULL, "C:\\freeswitch1.0.4\\debug\\sounds\\music\\8000\\danza-espanola-op-37-h-142-xii-arabesca.wav", NULL);
}

Now the hooks for channel_write_frame and channel_read_frame are called! I write the audio frames into a file for testing if everything is correct. The data written in channel_write_frame seems to be perfect, but audio written in channel_read_frame only seems to be good at first sight. If I record 20 seconds of audio and listen to the audiofile I hear that 2 or 3 times short parts are missing. 

static switch_status_t channel_write_frame(switch_core_session_t *session, switch_frame_t *frame, switch_io_flag_t flags, int stream_id)
{
  // Audio from danza-espanola-op-37-h-142-xii-arabesca.wav is written into a file

  fwrite((short *)frame->data, 2, frame->datalen/2 ,tmp);
}
static switch_status_t channel_read_frame(switch_core_session_t *session, switch_frame_t **frame, switch_io_flag_t flags, int stream_id)

{
    // Spoken audio samples from my microphone are written, but sometimes samples are missing
    fwrite((short *)frame->data, 2, frame->datalen/2 ,tmp);
}

Is it possible that I don't get all audio samples by hooked functions? why audio recorded in channel_write_frame is brilliant and in channel_read_frame not?

Date: Tue, 16 Mar 2010 13:59:28 -0500
From: anthony.minessale at gmail.com
To: freeswitch-dev at lists.freeswitch.org

Subject: Re: [Freeswitch-dev] hooked functions are not called while using	one single session

you probably want to use the application interface and a while loop while reading a frame.

see most of the functions in switch_ivr_play_say

On Tue, Mar 16, 2010 at 8:51 AM, Francisco Scaramanga <scaram at hotmail.de> wrote:

The module I am writing should be an endpoint VOIP-interface for another program. The module should answer a call and transport incoming audio into a 3rd party application. Furthermore the 3rd party application sends audio data back to the caller. This is why I hooked channel_read_frame and channel_write_frame. 

How can I trigger the channel to do something that requires reading or writing audio? Does it make a difference to use the endpoint interface instead of the hooks? 

Date: Tue, 16 Mar 2010 08:34:18 -0500

From: anthony.minessale at gmail.com
To: freeswitch-dev at lists.freeswitch.org
Subject: Re: [Freeswitch-dev] hooked functions are not called while using	one single session

What exactly is your goal?

those hooks will probably only be called if you send the channel to do something that 
requires reading and writing audio.

On Tue, Mar 16, 2010 at 6:47 AM, Francisco Scaramanga <scaram at hotmail.de> wrote:

Hello,
I am writing my own freeswitch module and have implemented 2 hooks for reading and writing audio (I did not implement the endpoint interface).
My problem is that the channel_write_frame and channel_read_frame callback-functions are only called if I make an intercept with another session (switch_ivr_intercept_session), but my usecase has only one single Session for getting and putting audio data in my module. 

How can I achieve this? 
scaram

/* on channel init I answer the session and set hooks */
static switch_status_t channel_on_init(switch_core_session_t *session)
{
    switch_channel_t *channel = switch_core_session_get_channel(session);

    switch_channel_answer(channel);

    switch_channel_set_state(channel, CS_EXCHANGE_MEDIA);
    switch_set_flag(tech_pvt, TFLAG_IO);

    switch_core_event_hook_add_write_frame(session, &channel_write_frame);

    switch_core_event_hook_add_read_frame(session, &channel_read_frame);
}

static switch_status_t channel_write_frame(switch_core_session_t *session, switch_frame_t *frame, switch_io_flag_t flags, int stream_id)

{
    /* is only called when I intercept 2 Sessions */
}
static switch_status_t channel_read_frame(switch_core_session_t *session, switch_frame_t *frame, switch_io_flag_t flags, int stream_id)
{
    /* is only called when I intercept 2 Sessions */

}

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-- 
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Twitter: http://twitter.com/FreeSWITCH_wire

AIM: anthm
MSN:anthony_minessale at hotmail.com
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