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          31 : DTMFGenerator::DTMFGenerator(unsigned int sampleRate, AVSampleFormat sampleFormat)
      57          31 :     : state()
      58          31 :     , sampleRate_(sampleRate)
      59          31 :     , tone_("", sampleRate, sampleFormat)
      60             : {
      61          31 :     state.offset = 0;
      62          31 :     state.sample = 0;
      63             : 
      64         527 :     for (int i = 0; i < NUM_TONES; i++)
      65         496 :         toneBuffers_[i] = fillToneBuffer(i);
      66          31 : }
      67             : 
      68          31 : DTMFGenerator::~DTMFGenerator() {}
      69             : 
      70             : using std::vector;
      71             : 
      72             : void
      73           0 : DTMFGenerator::getSamples(AVFrame* frame, unsigned char code)
      74             : {
      75           0 :     code = toupper(code);
      76             : 
      77           0 :     if (code >= '0' and code <= '9')
      78           0 :         state.sample = toneBuffers_[code - '0'].get();
      79           0 :     else if (code >= 'A' and code <= 'D')
      80           0 :         state.sample = toneBuffers_[code - 'A' + 10].get();
      81             :     else {
      82           0 :         switch (code) {
      83           0 :         case '*':
      84           0 :             state.sample = toneBuffers_[NUM_TONES - 2].get();
      85           0 :             break;
      86             : 
      87           0 :         case '#':
      88           0 :             state.sample = toneBuffers_[NUM_TONES - 1].get();
      89           0 :             break;
      90             : 
      91           0 :         default:
      92           0 :             throw DTMFException("Invalid code");
      93             :             break;
      94             :         }
      95             :     }
      96             : 
      97           0 :     av_samples_copy(frame->data,
      98           0 :                     state.sample->data,
      99             :                     0,
     100           0 :                     state.offset,
     101             :                     frame->nb_samples,
     102             :                     frame->ch_layout.nb_channels,
     103           0 :                     (AVSampleFormat) frame->format);
     104           0 :     state.offset = frame->nb_samples % sampleRate_;
     105           0 : }
     106             : 
     107             : /*
     108             :  * Get next n samples (continues where previous call to
     109             :  * genSample or genNextSamples stopped
     110             :  */
     111             : void
     112           0 : DTMFGenerator::getNextSamples(AVFrame* frame)
     113             : {
     114           0 :     if (state.sample == 0)
     115           0 :         throw DTMFException("DTMF generator not initialized");
     116             : 
     117           0 :     av_samples_copy(frame->data,
     118           0 :                     state.sample->data,
     119             :                     0,
     120           0 :                     state.offset,
     121             :                     frame->nb_samples,
     122             :                     frame->ch_layout.nb_channels,
     123           0 :                     (AVSampleFormat) frame->format);
     124           0 :     state.offset = (state.offset + frame->nb_samples) % sampleRate_;
     125           0 : }
     126             : 
     127             : libjami::FrameBuffer
     128         496 : DTMFGenerator::fillToneBuffer(unsigned index)
     129             : {
     130         496 :     assert(index < NUM_TONES);
     131         496 :     libjami::FrameBuffer ptr(av_frame_alloc());
     132         496 :     ptr->nb_samples = sampleRate_;
     133         496 :     ptr->format = tone_.getFormat().sampleFormat;
     134         496 :     ptr->sample_rate = sampleRate_;
     135         496 :     ptr->channel_layout = AV_CH_LAYOUT_MONO;
     136         496 :     av_channel_layout_from_mask(&ptr->ch_layout, AV_CH_LAYOUT_MONO);
     137         496 :     av_frame_get_buffer(ptr.get(), 0);
     138         496 :     tone_.genSin(ptr.get(), 0, ptr->nb_samples, TONES[index].higher, TONES[index].lower);
     139         496 :     return ptr;
     140           0 : }
     141             : 
     142             : } // namespace jami