Line data    Source code

       1              : /*
       2              :  *  Copyright (C) 2004-2026 Savoir-faire Linux Inc.
       3              :  *
       4              :  *  This program is free software: you can redistribute it and/or modify
       5              :  *  it under the terms of the GNU General Public License as published by
       6              :  *  the Free Software Foundation, either version 3 of the License, or
       7              :  *  (at your option) any later version.
       8              :  *
       9              :  *  This program is distributed in the hope that it will be useful,
      10              :  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
      11              :  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
      12              :  *  GNU General Public License for more details.
      13              :  *
      14              :  *  You should have received a copy of the GNU General Public License
      15              :  *  along with this program. If not, see <https://www.gnu.org/licenses/>.
      16              :  */
      17              : #include "dtmfgenerator.h"
      18              : #include "libav_deps.h"
      19              : 
      20              : #include <cmath>
      21              : #include <cassert>
      22              : 
      23              : namespace jami {
      24              : 
      25              : /** Struct to handle a DTMF */
      26              : struct DTMFTone
      27              : {
      28              :     unsigned char code; /** Code of the tone */
      29              :     unsigned lower;     /** Lower frequency */
      30              :     unsigned higher;    /** Higher frequency */
      31              : };
      32              : 
      33              : /*
      34              :  * Tone frequencies
      35              :  */
      36              : constexpr DTMFTone TONES[] = {{'0', 941, 1336},
      37              :                               {'1', 697, 1209},
      38              :                               {'2', 697, 1336},
      39              :                               {'3', 697, 1477},
      40              :                               {'4', 770, 1209},
      41              :                               {'5', 770, 1336},
      42              :                               {'6', 770, 1477},
      43              :                               {'7', 852, 1209},
      44              :                               {'8', 852, 1336},
      45              :                               {'9', 852, 1477},
      46              :                               {'A', 697, 1633},
      47              :                               {'B', 770, 1633},
      48              :                               {'C', 852, 1633},
      49              :                               {'D', 941, 1633},
      50              :                               {'*', 941, 1209},
      51              :                               {'#', 941, 1477}};
      52              : 
      53              : /*
      54              :  * Initialize the generator
      55              :  */
      56           32 : DTMFGenerator::DTMFGenerator(unsigned int sampleRate, AVSampleFormat sampleFormat)
      57           32 :     : state()
      58           32 :     , sampleRate_(sampleRate)
      59           32 :     , tone_("", sampleRate, sampleFormat)
      60              : {
      61           32 :     state.offset = 0;
      62           32 :     state.sample = 0;
      63              : 
      64          544 :     for (int i = 0; i < NUM_TONES; i++)
      65          512 :         toneBuffers_[i] = fillToneBuffer(i);
      66           32 : }
      67              : 
      68           32 : DTMFGenerator::~DTMFGenerator() {}
      69              : 
      70              : void
      71            0 : DTMFGenerator::getSamples(AVFrame* frame, unsigned char code)
      72              : {
      73            0 :     code = toupper(code);
      74              : 
      75            0 :     if (code >= '0' and code <= '9')
      76            0 :         state.sample = toneBuffers_[code - '0'].get();
      77            0 :     else if (code >= 'A' and code <= 'D')
      78            0 :         state.sample = toneBuffers_[code - 'A' + 10].get();
      79              :     else {
      80            0 :         switch (code) {
      81            0 :         case '*':
      82            0 :             state.sample = toneBuffers_[NUM_TONES - 2].get();
      83            0 :             break;
      84              : 
      85            0 :         case '#':
      86            0 :             state.sample = toneBuffers_[NUM_TONES - 1].get();
      87            0 :             break;
      88              : 
      89            0 :         default:
      90            0 :             throw DTMFException("Invalid code");
      91              :             break;
      92              :         }
      93              :     }
      94              : 
      95            0 :     av_samples_copy(frame->data,
      96            0 :                     state.sample->data,
      97              :                     0,
      98            0 :                     state.offset,
      99              :                     frame->nb_samples,
     100              :                     frame->ch_layout.nb_channels,
     101            0 :                     (AVSampleFormat) frame->format);
     102            0 :     state.offset = frame->nb_samples % sampleRate_;
     103            0 : }
     104              : 
     105              : /*
     106              :  * Get next n samples (continues where previous call to
     107              :  * genSample or genNextSamples stopped
     108              :  */
     109              : void
     110            0 : DTMFGenerator::getNextSamples(AVFrame* frame)
     111              : {
     112            0 :     if (state.sample == 0)
     113            0 :         throw DTMFException("DTMF generator not initialized");
     114              : 
     115            0 :     av_samples_copy(frame->data,
     116            0 :                     state.sample->data,
     117              :                     0,
     118            0 :                     state.offset,
     119              :                     frame->nb_samples,
     120              :                     frame->ch_layout.nb_channels,
     121            0 :                     (AVSampleFormat) frame->format);
     122            0 :     state.offset = (state.offset + frame->nb_samples) % sampleRate_;
     123            0 : }
     124              : 
     125              : libjami::FrameBuffer
     126          512 : DTMFGenerator::fillToneBuffer(unsigned index)
     127              : {
     128          512 :     assert(index < NUM_TONES);
     129          512 :     libjami::FrameBuffer ptr(av_frame_alloc());
     130          512 :     ptr->nb_samples = sampleRate_;
     131          512 :     ptr->format = tone_.getFormat().sampleFormat;
     132          512 :     ptr->sample_rate = sampleRate_;
     133          512 :     ptr->channel_layout = AV_CH_LAYOUT_MONO;
     134          512 :     av_channel_layout_from_mask(&ptr->ch_layout, AV_CH_LAYOUT_MONO);
     135          512 :     av_frame_get_buffer(ptr.get(), 0);
     136          512 :     tone_.genSin(ptr.get(), 0, ptr->nb_samples, TONES[index].higher, TONES[index].lower);
     137          512 :     return ptr;
     138            0 : }
     139              : 
     140              : } // namespace jami