Line data    Source code

       1              : /*
       2              :  * SPDX-License-Identifier: GPL-3.0-only
       3              :  * MuseScore-CLA-applies
       4              :  *
       5              :  * MuseScore Studio
       6              :  * Music Composition & Notation
       7              :  *
       8              :  * Copyright (C) 2021 MuseScore Limited and others
       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 version 3 as
      12              :  * published by the Free Software Foundation.
      13              :  *
      14              :  * This program is distributed in the hope that it will be useful,
      15              :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      16              :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      17              :  * GNU General Public License for more details.
      18              :  *
      19              :  * You should have received a copy of the GNU General Public License
      20              :  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
      21              :  */
      22              : #include "sinesource.h"
      23              : 
      24              : #include <cmath>
      25              : 
      26              : using namespace muse::audio;
      27              : using namespace muse::audio::engine;
      28              : 
      29            0 : SineSource::SineSource()
      30              : {
      31            0 : }
      32              : 
      33            0 : unsigned int SineSource::audioChannelsCount() const
      34              : {
      35            0 :     return 2;
      36              : }
      37              : 
      38            0 : samples_t SineSource::process(float* buffer, samples_t samplesPerChannel)
      39              : {
      40            0 :     auto streams = audioChannelsCount();
      41            0 :     for (unsigned int i = 0; i < samplesPerChannel; ++i) {
      42            0 :         m_phase += m_frequency / m_outputSpec.sampleRate * 2 * M_PI;
      43            0 :         if (m_phase > 2 * M_PI) {
      44            0 :             m_phase -= 2 * float(M_PI);
      45              :         }
      46              : 
      47            0 :         for (unsigned int s = 0; s < streams; ++s) {
      48            0 :             buffer[streams * i + s] = 0.1 * std::sin(m_phase + s * 2 * M_PI / streams);
      49              :         }
      50              :     }
      51              : 
      52            0 :     return samplesPerChannel;
      53              : }