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) 2026 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 "mixernode.h"
      23              : 
      24              : using namespace muse::audio::engine;
      25              : 
      26            0 : void MixerNode::onOutputSpecChanged(const OutputSpec& spec)
      27              : {
      28            0 :     const size_t bufferSize = m_outputSpec.samplesPerChannel * m_outputSpec.audioChannelCount;
      29            0 :     m_buffer.resize(bufferSize);
      30              : 
      31            0 :     for (auto& input : m_inputs) {
      32            0 :         input->setOutputSpec(spec);
      33              :     }
      34            0 : }
      35              : 
      36            0 : void MixerNode::onModeChanged(const ProcessMode mode)
      37              : {
      38            0 :     for (auto& input : m_inputs) {
      39            0 :         input->setMode(mode);
      40              :     }
      41            0 : }
      42              : 
      43            0 : bool MixerNode::doAddNode(std::shared_ptr<IAudioNode> other)
      44              : {
      45            0 :     m_inputs.emplace_back(other);
      46            0 :     return true;
      47              : }
      48              : 
      49            0 : bool MixerNode::doRemoveNode(std::shared_ptr<IAudioNode> other)
      50              : {
      51            0 :     muse::remove(m_inputs, other);
      52            0 :     return true;
      53              : }
      54              : 
      55            0 : void MixerNode::process(float* buffer, samples_t samplesPerChannel)
      56              : {
      57            0 :     if (!m_enabled) {
      58            0 :         return;
      59              :     }
      60              : 
      61            0 :     const audioch_t audioChannelCount = m_outputSpec.audioChannelCount;
      62            0 :     const size_t outBufferSize = samplesPerChannel * audioChannelCount;
      63              : 
      64            0 :     for (auto& input : m_inputs) {
      65              :         // prepare input buffer
      66            0 :         if (m_buffer.size() < outBufferSize) {
      67            0 :             m_buffer.resize(outBufferSize);
      68              :         }
      69              : 
      70              :         // clear previous data
      71            0 :         std::fill(m_buffer.begin(), m_buffer.begin() + outBufferSize, 0.0f);
      72              : 
      73              :         // process input
      74            0 :         input->process(m_buffer.data(), samplesPerChannel);
      75              : 
      76              :         // mix input into output
      77            0 :         for (samples_t s = 0; s < samplesPerChannel; ++s) {
      78            0 :             size_t samplePos = s * audioChannelCount;
      79            0 :             for (audioch_t audioChNum = 0; audioChNum < audioChannelCount; ++audioChNum) {
      80            0 :                 size_t idx = samplePos + audioChNum;
      81            0 :                 buffer[idx] += m_buffer[idx];
      82              :             }
      83              :         }
      84              :     }
      85              : }
      86              : 
      87            0 : void MixerNode::doSelfProcess(float*, samples_t)
      88              : {
      89              :     // noop
      90            0 : }