Line data    Source code

       1             : /*
       2             :  *  Copyright (C) 2004-2025 Savoir-faire Linux Inc.
       3             :  *
       4             :  *  Inspired by tonegenerator of
       5             :  *   Laurielle Lea <laurielle.lea@savoirfairelinux.com> (2004)
       6             :  *  Inspired by ringbuffer of Audacity Project
       7             :  *
       8             :  *  This program is free software: you can redistribute it and/or modify
       9             :  *  it under the terms of the GNU General Public License as published by
      10             :  *  the Free Software Foundation, either version 3 of the License, or
      11             :  *  (at your option) any later version.
      12             :  *
      13             :  *  This program is distributed in the hope that it will be useful,
      14             :  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
      15             :  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
      16             :  *  GNU General Public License for more details.
      17             :  *
      18             :  *  You should have received a copy of the GNU General Public License
      19             :  *  along with this program. If not, see <https://www.gnu.org/licenses/>.
      20             :  */
      21             : 
      22             : #ifdef HAVE_CONFIG_H
      23             : #include "config.h"
      24             : #endif
      25             : 
      26             : #include "audioloop.h"
      27             : #include "logger.h"
      28             : #include "libav_deps.h"
      29             : 
      30             : #include <algorithm> // std::min
      31             : 
      32             : namespace jami {
      33             : 
      34         435 : AudioLoop::AudioLoop(AudioFormat format)
      35         435 :     : format_(format)
      36         435 :     , buffer_(av_frame_alloc())
      37         435 :     , pos_(0)
      38         435 : {}
      39             : 
      40         435 : AudioLoop::~AudioLoop() {}
      41             : 
      42             : void
      43           0 : AudioLoop::seek(double relative_position)
      44             : {
      45           0 :     pos_ = static_cast<double>(getSize() * relative_position * 0.01);
      46           0 : }
      47             : 
      48             : void
      49           0 : AudioLoop::getNext(AVFrame* output, bool mute)
      50             : {
      51           0 :     if (!buffer_) {
      52           0 :         JAMI_ERR("buffer is NULL");
      53           0 :         return;
      54             :     }
      55             : 
      56           0 :     const size_t buf_samples = buffer_->nb_samples;
      57           0 :     size_t pos = pos_;
      58           0 :     size_t total_samples = output->nb_samples;
      59           0 :     size_t output_pos = 0;
      60             : 
      61           0 :     if (buf_samples == 0) {
      62           0 :         JAMI_ERR("Audio loop size is 0");
      63           0 :         av_samples_set_silence(output->data, 0, output->nb_samples, format_.nb_channels, format_.sampleFormat);
      64           0 :         return;
      65           0 :     } else if (pos >= buf_samples) {
      66           0 :         JAMI_ERR("Invalid loop position %zu", pos);
      67           0 :         return;
      68             :     }
      69             : 
      70           0 :     while (total_samples != 0) {
      71           0 :         size_t samples = std::min(total_samples, buf_samples - pos);
      72           0 :         if (not mute)
      73           0 :             av_samples_copy(output->data,
      74           0 :                             buffer_->data,
      75             :                             output_pos,
      76             :                             pos,
      77             :                             samples,
      78           0 :                             format_.nb_channels,
      79             :                             format_.sampleFormat);
      80             :         else
      81           0 :             av_samples_set_silence(output->data, output_pos, samples, format_.nb_channels, format_.sampleFormat);
      82           0 :         output_pos += samples;
      83           0 :         pos = (pos + samples) % buf_samples;
      84           0 :         total_samples -= samples;
      85             :     }
      86             : 
      87           0 :     pos_ = pos;
      88           0 :     onBufferFinish();
      89             : }
      90             : 
      91             : void
      92           0 : AudioLoop::onBufferFinish()
      93           0 : {}
      94             : 
      95             : std::unique_ptr<AudioFrame>
      96           0 : AudioLoop::getNext(size_t samples, bool mute)
      97             : {
      98           0 :     if (samples == 0) {
      99           0 :         samples = buffer_->sample_rate / 50;
     100             :     }
     101           0 :     auto buffer = std::make_unique<AudioFrame>(format_, samples);
     102           0 :     getNext(buffer->pointer(), mute);
     103           0 :     return buffer;
     104           0 : }
     105             : 
     106             : } // namespace jami