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