sjero.net Git - linphone/blob - coreapi/ec-calibrator.c

   1 /*
   2 linphone
   3 Copyright (C) 2011 Belledonne Communications SARL
   4 Author: Simon MORLAT (simon.morlat@linphone.org)
   5
   6 This program is free software; you can redistribute it and/or
   7 modify it under the terms of the GNU General Public License
   8 as published by the Free Software Foundation; either version 2
   9 of the License, or (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19 */
  20
  21 #include "private.h"
  22
  23 #include "mediastreamer2/mstonedetector.h"
  24 #include "mediastreamer2/dtmfgen.h"
  25
  26
  27
  28
  29
  30 static void ecc_init_filters(EcCalibrator *ecc){
  31         ecc->ticker=ms_ticker_new();
  32
  33         ecc->sndread=ms_snd_card_create_reader(ecc->play_card);
  34         ecc->det=ms_filter_new(MS_TONE_DETECTOR_ID);
  35         ecc->rec=ms_filter_new(MS_FILE_REC_ID);
  36
  37         ms_filter_link(ecc->sndread,0,ecc->det,0);
  38         ms_filter_link(ecc->det,0,ecc->rec,0);
  39
  40         ecc->play=ms_filter_new(MS_FILE_PLAYER_ID);
  41         ecc->gen=ms_filter_new(MS_DTMF_GEN_ID);
  42         ecc->resampler=ms_filter_new(MS_RESAMPLE_ID);
  43         ecc->sndwrite=ms_snd_card_create_writer(ecc->capt_card);
  44
  45         ms_filter_link(ecc->play,0,ecc->gen,0);
  46         ms_filter_link(ecc->gen,0,ecc->resampler,0);
  47         ms_filter_link(ecc->resampler,0,ecc->sndwrite,0);
  48         unsigned int rate;
  49         ms_filter_call_method(ecc->sndwrite,MS_FILTER_GET_SAMPLE_RATE,&rate);
  50         ms_filter_call_method(ecc->resampler,MS_FILTER_SET_OUTPUT_SAMPLE_RATE,&rate);
  51
  52         ms_ticker_attach(ecc->ticker,ecc->play);
  53         ms_ticker_attach(ecc->ticker,ecc->sndread);
  54 }
  55
  56 static void ecc_deinit_filters(EcCalibrator *ecc){
  57         ms_ticker_detach(ecc->ticker,ecc->play);
  58         ms_ticker_detach(ecc->ticker,ecc->sndread);
  59
  60         ms_filter_unlink(ecc->play,0,ecc->gen,0);
  61         ms_filter_unlink(ecc->gen,0,ecc->resampler,0);
  62         ms_filter_unlink(ecc->resampler,0,ecc->sndwrite,0);
  63
  64         ms_filter_unlink(ecc->sndread,0,ecc->det,0);
  65         ms_filter_unlink(ecc->det,0,ecc->rec,0);
  66
  67         ms_filter_destroy(ecc->sndread);
  68         ms_filter_destroy(ecc->det);
  69         ms_filter_destroy(ecc->rec);
  70         ms_filter_destroy(ecc->play);
  71         ms_filter_destroy(ecc->gen);
  72         ms_filter_destroy(ecc->resampler);
  73         ms_filter_destroy(ecc->sndwrite);
  74
  75         ms_ticker_destroy(ecc->ticker);
  76 }
  77
  78 static void on_tone_sent(void *data, MSFilter *f, unsigned int event_id, void *arg){
  79         MSDtmfGenEvent *ev=(MSDtmfGenEvent*)arg;
  80         EcCalibrator *ecc=(EcCalibrator*)data;
  81         ecc->sent_count++;
  82         ecc->acc-=ev->tone_start_time;
  83         ms_message("Sent tone at %u",(unsigned int)ev->tone_start_time);
  84 }
  85
  86 static void on_tone_received(void *data, MSFilter *f, unsigned int event_id, void *arg){
  87         MSToneDetectorEvent *ev=(MSToneDetectorEvent*)arg;
  88         EcCalibrator *ecc=(EcCalibrator*)data;
  89         ecc->recv_count++;
  90         ecc->acc+=ev->tone_start_time;
  91         ms_message("Received tone at %u",(unsigned int)ev->tone_start_time);
  92 }
  93
  94 static void ecc_play_tones(EcCalibrator *ecc){
  95         MSDtmfGenCustomTone tone;
  96         MSToneDetectorDef expected_tone;
  97
  98
  99         ms_filter_set_notify_callback(ecc->det,on_tone_received,ecc);
 100
 101         expected_tone.frequency=2000;
 102         expected_tone.min_duration=40;
 103         expected_tone.min_amplitude=0.02;
 104
 105         ms_filter_call_method (ecc->det,MS_TONE_DETECTOR_ADD_SCAN,&expected_tone);
 106
 107         tone.frequency=1000;
 108         tone.duration=1000;
 109         tone.amplitude=1.0;
 110
 111         /*play an initial tone to startup the audio playback/capture*/
 112         ms_filter_call_method(ecc->gen,MS_DTMF_GEN_PLAY_CUSTOM,&tone);
 113         ms_sleep(2);
 114
 115         ms_filter_set_notify_callback(ecc->gen,on_tone_sent,ecc);
 116         tone.frequency=2000;
 117         tone.duration=100;
 118
 119         ms_filter_call_method(ecc->gen,MS_DTMF_GEN_PLAY_CUSTOM,&tone);
 120         ms_sleep(1);
 121         ms_filter_call_method(ecc->gen,MS_DTMF_GEN_PLAY_CUSTOM,&tone);
 122         ms_sleep(1);
 123         ms_filter_call_method(ecc->gen,MS_DTMF_GEN_PLAY_CUSTOM,&tone);
 124         ms_sleep(1);
 125
 126         if (ecc->sent_count==3 && ecc->recv_count==3){
 127                 int delay=ecc->acc/3;
 128                 if (delay<0){
 129                         ms_error("Quite surprising calibration result, delay=%i",delay);
 130                         ecc->status=LinphoneEcCalibratorFailed;
 131                 }else{ms_message("Echo calibration estimated delay to be %i ms",delay);
 132                         ecc->delay=delay;
 133                         ecc->status=LinphoneEcCalibratorDone;
 134                 }
 135         }else{
 136                 ms_error("Echo calibration failed, tones received = %i",ecc->recv_count);
 137                 ecc->status=LinphoneEcCalibratorFailed;
 138         }
 139
 140 }
 141
 142 static void  * ecc_thread(void *p){
 143         EcCalibrator *ecc=(EcCalibrator*)p;
 144
 145         ecc_init_filters(ecc);
 146         ecc_play_tones(ecc);
 147         ecc_deinit_filters(ecc);
 148         ms_thread_exit(NULL);
 149         return NULL;
 150 }
 151
 152 EcCalibrator * ec_calibrator_new(MSSndCard *play_card, MSSndCard *capt_card, LinphoneEcCalibrationCallback cb, void *cb_data ){
 153         EcCalibrator *ecc=ms_new0(EcCalibrator,1);
 154
 155         ecc->cb=cb;
 156         ecc->cb_data=cb_data;
 157         ecc->capt_card=capt_card;
 158         ecc->play_card=play_card;
 159         ms_thread_create(&ecc->thread,NULL,ecc_thread,ecc);
 160         return ecc;
 161 }
 162
 163 LinphoneEcCalibratorStatus ec_calibrator_get_status(EcCalibrator *ecc){
 164         return ecc->status;
 165 }
 166
 167 void ec_calibrator_destroy(EcCalibrator *ecc){
 168         ms_thread_join(ecc->thread,NULL);
 169         ms_free(ecc);
 170 }
 171
 172 int linphone_core_start_echo_calibration(LinphoneCore *lc, LinphoneEcCalibrationCallback cb, void *cb_data){
 173         if (lc->ecc!=NULL){
 174                 ms_error("Echo calibration is still on going !");
 175                 return -1;
 176         }
 177         lc->ecc=ec_calibrator_new(lc->sound_conf.play_sndcard,lc->sound_conf.capt_sndcard,cb,cb_data);
 178         return 0;
 179 }