Line data    Source code

       1             : /*
       2             :  *  Copyright (C) 2004-2024 Savoir-faire Linux Inc.
       3             :  *
       4             :  *  Author: Yan Morin <yan.morin@savoirfairelinux.com>
       5             :  *
       6             :  *  Inspired by tonegenerator of
       7             :  *   Laurielle Lea <laurielle.lea@savoirfairelinux.com> (2004)
       8             :  *  Inspired by ringbuffer of Audacity Project
       9             :  *
      10             :  *  This program is free software; you can redistribute it and/or modify
      11             :  *  it under the terms of the GNU General Public License as published by
      12             :  *  the Free Software Foundation; either version 3 of the License, or
      13             :  *  (at your option) any later version.
      14             :  *
      15             :  *  This program is distributed in the hope that it will be useful,
      16             :  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
      17             :  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      18             :  *  GNU General Public License for more details.
      19             :  *
      20             :  *  You should have received a copy of the GNU General Public License
      21             :  *  along with this program; if not, write to the Free Software
      22             :  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.
      23             :  */
      24             : 
      25             : #ifdef HAVE_CONFIG_H
      26             : #include "config.h"
      27             : #endif
      28             : 
      29             : #include "audioloop.h"
      30             : #include "logger.h"
      31             : #include "libav_deps.h"
      32             : 
      33             : #include <algorithm> // std::min
      34             : 
      35             : namespace jami {
      36             : 
      37         465 : AudioLoop::AudioLoop(AudioFormat format)
      38         465 :     : format_(format)
      39         465 :     , buffer_(av_frame_alloc())
      40         465 :     , pos_(0)
      41             : {
      42         465 : }
      43             : 
      44         465 : AudioLoop::~AudioLoop()
      45         465 : {}
      46             : 
      47             : void
      48           0 : AudioLoop::seek(double relative_position)
      49             : {
      50           0 :     pos_ = static_cast<double>(getSize() * relative_position * 0.01);
      51           0 : }
      52             : 
      53             : void
      54           0 : AudioLoop::getNext(AVFrame* output, bool mute)
      55             : {
      56           0 :     if (!buffer_) {
      57           0 :         JAMI_ERR("buffer is NULL");
      58           0 :         return;
      59             :     }
      60             : 
      61           0 :     const size_t buf_samples = buffer_->nb_samples;
      62           0 :     size_t pos = pos_;
      63           0 :     size_t total_samples = output->nb_samples;
      64           0 :     size_t output_pos = 0;
      65             : 
      66           0 :     if (buf_samples == 0) {
      67           0 :         JAMI_ERR("Audio loop size is 0");
      68           0 :         av_samples_set_silence(output->data, 0, output->nb_samples, format_.nb_channels, format_.sampleFormat);
      69           0 :         return;
      70           0 :     } else if (pos >= buf_samples) {
      71           0 :         JAMI_ERR("Invalid loop position %zu", pos);
      72           0 :         return;
      73             :     }
      74             : 
      75           0 :     while (total_samples != 0) {
      76           0 :         size_t samples = std::min(total_samples, buf_samples - pos);
      77           0 :         if (not mute)
      78           0 :             av_samples_copy(output->data, buffer_->data, output_pos, pos, samples, format_.nb_channels, format_.sampleFormat);
      79             :         else
      80           0 :             av_samples_set_silence(output->data, output_pos, samples, format_.nb_channels, format_.sampleFormat);
      81           0 :         output_pos += samples;
      82           0 :         pos = (pos + samples) % buf_samples;
      83           0 :         total_samples -= samples;
      84             :     }
      85             : 
      86           0 :     pos_ = pos;
      87           0 :     onBufferFinish();
      88             : }
      89             : 
      90             : void
      91           0 : AudioLoop::onBufferFinish()
      92           0 : {}
      93             : 
      94             : std::unique_ptr<AudioFrame>
      95           0 : AudioLoop::getNext(size_t samples, bool mute)
      96             : {
      97           0 :     if (samples == 0) {
      98           0 :         samples = buffer_->sample_rate / 50;
      99             :     }
     100           0 :     auto buffer = std::make_unique<AudioFrame>(format_, samples);
     101           0 :     getNext(buffer->pointer(), mute);
     102           0 :     return buffer;
     103           0 : }
     104             : 
     105             : } // namespace jami