[Freeswitch-dev] hooked functions are not called while using one single session
Anthony Minessale
anthony.minessale at gmail.com
Fri Mar 26 11:07:14 PDT 2010
you put 1 frame in write for each read with the data size i told you about
in the last email
On Fri, Mar 26, 2010 at 12:55 PM, Francisco Scaramanga <scaram at hotmail.de>wrote:
> yes, switch_core_session_read_frame will be timed right. This is working
> for me, but my troubles are in switch_core_session_write_frame.
> Is this function timed write too when I put data into this function?
>
> ------------------------------
> Date: Fri, 26 Mar 2010 12:37:04 -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 can use the data you have,
>
> yes the the read will already be timed right
>
> when you get a frame that has flag SFF_CNG you know that there was not a
> real frame to read but you should still write
> the size id determined from getting the read_impl and using
> read_impl->encoded_bytes_per_frame
>
>
>
> On Fri, Mar 26, 2010 at 12:23 PM, Francisco Scaramanga <scaram at hotmail.de>wrote:
>
> ok, which is the best mechanism to controll the amount of data. Can you
> recommend a timer? I use PCMA codec with 20 msec intervall.
>
>
> ------------------------------
> Date: Fri, 26 Mar 2010 11:31:43 -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 can only write back the exact number of bytes you negotiated per
> interval.
>
>
> On Fri, Mar 26, 2010 at 7:27 AM, Francisco Scaramanga <scaram at hotmail.de>wrote:
>
> Now I call switch_core_session_read_frame and
> switch_core_session_write_frame in the same foreground loop. Then I write
> audio into a file and as a result I see that there are many audio gaps.
>
> There seems to be a cross effect by using switch_core_session_write_frame
> and switch_core_session_read_frame together.
> If I only use switch_core_session_read_frame in the loop, there are no gaps
> and everything sounds perfect!
>
> What could be the problem?
>
>
>
> while (1)
> {
> // READ
> tstatus = switch_core_session_read_frame(session, &read_frame,
> SWITCH_IO_FLAG_NONE, 0);
> if (tstatus==SWITCH_STATUS_SUCCESS)
> { // write audio in a testfile
> fwrite((short *)(read_frame)->data, 2,
> ((read_frame)->datalen)/2 ,tmp);
> switch_size_t ts_rf=read_frame->timestamp;
> }
>
> // WRITE
> vector<unsigned char> vucIn;
> if (getAudio(&vucAudio)) // get next audio and send it back
> {
> memcpy( write_frame.data, &vucIn[0], vucIn.size());
> write_frame.datalen=vucIn.size();
> tstatus = switch_core_session_write_frame(session, &write_frame,
> SWITCH_IO_FLAG_NONE, 0);
> }
> //Sleep(1);//?
> }
>
> ------------------------------
> Date: Mon, 22 Mar 2010 18:34:46 -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 don't use the hook functions you use a frame pointer
>
> switch_frame_t *read_frame;
>
> switch_core_session_read_frame(session, &read_frame, SWITCH_IO_FLAG_NONE,
> 0);
>
> when i said to look at the stream file example i meant in the function
> itself to see how
> to read and write audio from a channel in a foreground loop.
>
>
>
> On Mon, Mar 22, 2010 at 6:23 PM, Francisco Scaramanga <scaram at hotmail.de>wrote:
>
> 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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>
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>
> FreeSWITCH http://www.freeswitch.org/
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>
> FreeSWITCH http://www.freeswitch.org/
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>
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> Anthony Minessale II
>
> FreeSWITCH http://www.freeswitch.org/
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