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 #include "lpconfig.h"
  27
  28
  29
  30 static void ecc_init_filters(EcCalibrator *ecc){
  31         unsigned int rate;
  32         ecc->ticker=ms_ticker_new();
  33
  34         ecc->sndread=ms_snd_card_create_reader(ecc->play_card);
  35         ms_filter_call_method(ecc->sndread,MS_FILTER_SET_SAMPLE_RATE,&ecc->rate);
  36         ecc->det=ms_filter_new(MS_TONE_DETECTOR_ID);
  37         ms_filter_call_method(ecc->det,MS_FILTER_SET_SAMPLE_RATE,&ecc->rate);
  38         ecc->rec=ms_filter_new(MS_FILE_REC_ID);
  39
  40         ms_filter_link(ecc->sndread,0,ecc->det,0);
  41         ms_filter_link(ecc->det,0,ecc->rec,0);
  42
  43         ecc->play=ms_filter_new(MS_FILE_PLAYER_ID);
  44         ecc->gen=ms_filter_new(MS_DTMF_GEN_ID);
  45         ms_filter_call_method(ecc->gen,MS_FILTER_SET_SAMPLE_RATE,&ecc->rate);
  46         ecc->resampler=ms_filter_new(MS_RESAMPLE_ID);
  47         ecc->sndwrite=ms_snd_card_create_writer(ecc->capt_card);
  48
  49         ms_filter_link(ecc->play,0,ecc->gen,0);
  50         ms_filter_link(ecc->gen,0,ecc->resampler,0);
  51         ms_filter_link(ecc->resampler,0,ecc->sndwrite,0);
  52
  53         ms_filter_call_method(ecc->sndwrite,MS_FILTER_SET_SAMPLE_RATE,&ecc->rate);
  54         ms_filter_call_method(ecc->sndwrite,MS_FILTER_GET_SAMPLE_RATE,&rate);
  55         ms_filter_call_method(ecc->resampler,MS_FILTER_SET_SAMPLE_RATE,&ecc->rate);
  56         ms_filter_call_method(ecc->resampler,MS_FILTER_SET_OUTPUT_SAMPLE_RATE,&rate);
  57
  58         ms_ticker_attach(ecc->ticker,ecc->play);
  59         ms_ticker_attach(ecc->ticker,ecc->sndread);
  60 }
  61
  62 static void ecc_deinit_filters(EcCalibrator *ecc){
  63         ms_ticker_detach(ecc->ticker,ecc->play);
  64         ms_ticker_detach(ecc->ticker,ecc->sndread);
  65
  66         ms_filter_unlink(ecc->play,0,ecc->gen,0);
  67         ms_filter_unlink(ecc->gen,0,ecc->resampler,0);
  68         ms_filter_unlink(ecc->resampler,0,ecc->sndwrite,0);
  69
  70         ms_filter_unlink(ecc->sndread,0,ecc->det,0);
  71         ms_filter_unlink(ecc->det,0,ecc->rec,0);
  72
  73         ms_filter_destroy(ecc->sndread);
  74         ms_filter_destroy(ecc->det);
  75         ms_filter_destroy(ecc->rec);
  76         ms_filter_destroy(ecc->play);
  77         ms_filter_destroy(ecc->gen);
  78         ms_filter_destroy(ecc->resampler);
  79         ms_filter_destroy(ecc->sndwrite);
  80
  81         ms_ticker_destroy(ecc->ticker);
  82 }
  83
  84 static void on_tone_sent(void *data, MSFilter *f, unsigned int event_id, void *arg){
  85         MSDtmfGenEvent *ev=(MSDtmfGenEvent*)arg;
  86         EcCalibrator *ecc=(EcCalibrator*)data;
  87         ecc->sent_count++;
  88         ecc->acc-=ev->tone_start_time;
  89         ms_message("Sent tone at %u",(unsigned int)ev->tone_start_time);
  90 }
  91
  92 static void on_tone_received(void *data, MSFilter *f, unsigned int event_id, void *arg){
  93         MSToneDetectorEvent *ev=(MSToneDetectorEvent*)arg;
  94         EcCalibrator *ecc=(EcCalibrator*)data;
  95         ecc->recv_count++;
  96         ecc->acc+=ev->tone_start_time;
  97         ms_message("Received tone at %u",(unsigned int)ev->tone_start_time);
  98 }
  99
 100 static void ecc_play_tones(EcCalibrator *ecc){
 101         MSDtmfGenCustomTone tone;
 102         MSToneDetectorDef expected_tone;
 103
 104
 105         ms_filter_set_notify_callback(ecc->det,on_tone_received,ecc);
 106
 107         expected_tone.frequency=2000;
 108         expected_tone.min_duration=40;
 109         expected_tone.min_amplitude=0.02;
 110
 111         ms_filter_call_method (ecc->det,MS_TONE_DETECTOR_ADD_SCAN,&expected_tone);
 112
 113         tone.frequency=1000;
 114         tone.duration=1000;
 115         tone.amplitude=1.0;
 116
 117         /*play an initial tone to startup the audio playback/capture*/
 118         ms_filter_call_method(ecc->gen,MS_DTMF_GEN_PLAY_CUSTOM,&tone);
 119         ms_sleep(2);
 120
 121         ms_filter_set_notify_callback(ecc->gen,on_tone_sent,ecc);
 122         tone.frequency=2000;
 123         tone.duration=100;
 124
 125         ms_filter_call_method(ecc->gen,MS_DTMF_GEN_PLAY_CUSTOM,&tone);
 126         ms_sleep(1);
 127         ms_filter_call_method(ecc->gen,MS_DTMF_GEN_PLAY_CUSTOM,&tone);
 128         ms_sleep(1);
 129         ms_filter_call_method(ecc->gen,MS_DTMF_GEN_PLAY_CUSTOM,&tone);
 130         ms_sleep(1);
 131
 132         if (ecc->sent_count==3 && ecc->recv_count==3){
 133                 int delay=ecc->acc/3;
 134                 if (delay<0){
 135                         ms_error("Quite surprising calibration result, delay=%i",delay);
 136                         ecc->status=LinphoneEcCalibratorFailed;
 137                 }else{ms_message("Echo calibration estimated delay to be %i ms",delay);
 138                         ecc->delay=delay;
 139                         ecc->status=LinphoneEcCalibratorDone;
 140                 }
 141         }else{
 142                 ms_error("Echo calibration failed, tones received = %i",ecc->recv_count);
 143                 ecc->status=LinphoneEcCalibratorFailed;
 144         }
 145
 146 }
 147
 148 static void  * ecc_thread(void *p){
 149         EcCalibrator *ecc=(EcCalibrator*)p;
 150
 151         ecc_init_filters(ecc);
 152         ecc_play_tones(ecc);
 153         ecc_deinit_filters(ecc);
 154         ms_thread_exit(NULL);
 155         return NULL;
 156 }
 157
 158 EcCalibrator * ec_calibrator_new(MSSndCard *play_card, MSSndCard *capt_card, unsigned int rate, LinphoneEcCalibrationCallback cb, void *cb_data ){
 159         EcCalibrator *ecc=ms_new0(EcCalibrator,1);
 160
 161         ecc->rate=rate;
 162         ecc->cb=cb;
 163         ecc->cb_data=cb_data;
 164         ecc->capt_card=capt_card;
 165         ecc->play_card=play_card;
 166         ms_thread_create(&ecc->thread,NULL,ecc_thread,ecc);
 167         return ecc;
 168 }
 169
 170 LinphoneEcCalibratorStatus ec_calibrator_get_status(EcCalibrator *ecc){
 171         return ecc->status;
 172 }
 173
 174 void ec_calibrator_destroy(EcCalibrator *ecc){
 175         ms_thread_join(ecc->thread,NULL);
 176         ms_free(ecc);
 177 }
 178
 179 int linphone_core_start_echo_calibration(LinphoneCore *lc, LinphoneEcCalibrationCallback cb, void *cb_data){
 180         if (lc->ecc!=NULL){
 181                 ms_error("Echo calibration is still on going !");
 182                 return -1;
 183         }
 184         unsigned int rate = lp_config_get_int(lc->config,"sound","echo_cancellation_rate",8000);
 185         lc->ecc=ec_calibrator_new(lc->sound_conf.play_sndcard,lc->sound_conf.capt_sndcard,rate,cb,cb_data);
 186         return 0;
 187 }