Hello Gou Yangyan,
I think the way you want to implement it is the complicated way.
The best route is (I think) using SpanDSP library. This library contains a
very good in-band DTMF detection, including prevention of false DTMF
detection. SpanDSP is actually a quite big library which includes also fax
functionality. But you only need the DTMF detection parts, which you can
take out of the library (which is what I did).
You can easily integrate it alike the "way-writer"-plugin and also use it
that way.
You only need to initialize it and then feed the SpanDSP-detection routine
with the frames you receive. No special manipulation on the frames is
required.
Some people and myself already implemented it this way, and it works like a
charm.
With regards,
Eize
On Tue, Feb 16, 2016 at 6:00 PM, <pjsip-request at lists.pjsip.org> wrote:
>
> From: gou yangyang <gyy2046@xxxxxxxxxxx>
> To: "pjsip at lists.pjsip.org" <pjsip at lists.pjsip.org>
> Cc:
> Date: Tue, 16 Feb 2016 03:04:06 +0000
> Subject: PJSIP How to detect inband DTMF (no rfc2833?
>
> Dear ALL,
>
> Can anyone help me in detect inband DTMF?
>
> I want to use pjmedia API to get incoming audio data then use spandsp
> to analysis the DTMF info,But I can not get the incoming RTP data,Can
> someone help me ?
>
>
>
> The flow is what I have done to get the incoming RTP data .
>
>
> 1.in on_call_media_state
>
>
>
> pjsua_call_get_info(call_id,&ci);
>
> if (ci.media_status == PJSUA_CALL_MEDIA_ACTIVE)
> {
> buff = (char*)pj_pool_alloc(pool, 1000*sizeof(char));
> pjsua_conf_get_port_info(ci.conf_slot,&info);
> pjmedia_mem_capture_create(pool,buff,1000,info.clock_rate,
>
> info.channel_count,info.samples_per_frame,info.bits_per_sample,0,&media_port);
> //pjmedia_mem_player_set_eof_cb(media_port,buff,cpa_fft_got_data);
> pjmedia_mem_capture_set_eof_cb(media_port,buff,cpa_fft_got_data);
>
> pjsua_conf_add_port(pool,media_port,&listen_port);
> pjsua_conf_connect(ci.conf_slot,listen_port);
>
> }
> 2.in callback cpa_fft_got_data
> pj_status_t cpa_fft_got_data(pjmedia_port *port, void *usr_data)
> {
> pjmedia_frame frame ;
> pj_int16_t samplebuf[1024];
> frame.buf = samplebuf;
> frame.size = 1024;
> pjmedia_port_get_frame(port,&frame);
> //PJ_LOG(3,(THIS_FILE,"buf buf %s",usr_data));
> if (frame.type== PJMEDIA_FRAME_TYPE_NONE)
> {
> return 0;
> }
> // ....
> }
>
> Anyway when I send inband DTMF info by another client in cpa_fft_got_data
> it shows that
> frame.type == PJMEDIA_FRAE_TYPE_NONE so it will return 0,I can't get
> any data. So what should I do?
>
> http://comments.gmane.org/gmane.comp.voip.pjsip/9720 this address is
> the sample which I refered to.
>
>
> I'm so sorry my english is very poor.
>
> Best Regards.
>
>
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