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              : 
      23              : #include "signalnode.h"
      24              : 
      25              : using namespace muse::audio;
      26              : using namespace muse::audio::engine;
      27              : 
      28              : static constexpr volume_dbfs_t MINIMUM_OPERABLE_DBFS_LEVEL = volume_dbfs_t::make(-100.f);
      29              : static constexpr volume_dbfs_t PRESSURE_MINIMAL_VALUABLE_DIFF = volume_dbfs_t::make(2.5f);
      30              : 
      31            0 : bool SignalNode::isSilent() const
      32              : {
      33            0 :     return m_isSilent;
      34              : }
      35              : 
      36            0 : AudioSignalChanges SignalNode::audioSignalChanges() const
      37              : {
      38            0 :     return m_audioSignalChanges;
      39              : }
      40              : 
      41            0 : void SignalNode::onOutputSpecChanged(const OutputSpec& spec)
      42              : {
      43            0 :     m_channelPeaks.resize(spec.audioChannelCount, 0.f);
      44            0 : }
      45              : 
      46            0 : void SignalNode::doSelfProcess(float* buffer, samples_t samplesPerChannel)
      47              : {
      48            0 :     const audioch_t channelsCount = m_outputSpec.audioChannelCount;
      49              : 
      50            0 :     for (audioch_t ch = 0; ch < channelsCount; ++ch) {
      51            0 :         m_channelPeaks[ch] = 0.f;
      52              :     }
      53              : 
      54            0 :     for (size_t s = 0; s < samplesPerChannel; ++s) {
      55            0 :         const size_t frameOffset = s * channelsCount;
      56            0 :         for (size_t ch = 0; ch < channelsCount; ++ch) {
      57            0 :             const size_t idx = frameOffset + ch;
      58            0 :             const float a = std::fabs(buffer[idx]);
      59            0 :             if (a > m_channelPeaks[ch]) {
      60            0 :                 m_channelPeaks[ch] = a;
      61              :             }
      62              :         }
      63              :     }
      64              : 
      65            0 :     m_isSilent = true;
      66            0 :     for (audioch_t ch = 0; ch < channelsCount; ++ch) {
      67            0 :         float peak = m_channelPeaks[ch];
      68            0 :         if (peak > 0.f) {
      69            0 :             m_isSilent = false;
      70              :         }
      71            0 :         updateSignalValue(ch, peak);
      72              :     }
      73              : 
      74            0 :     notifyAboutChanges();
      75            0 : }
      76              : 
      77            0 : void SignalNode::updateSignalValue(const audioch_t ch, const float newPeak)
      78              : {
      79            0 :     volume_dbfs_t newPressure = (newPeak > 0.f) ? volume_dbfs_t(muse::linear_to_db(newPeak)) : MINIMUM_OPERABLE_DBFS_LEVEL;
      80            0 :     newPressure = std::max(newPressure, MINIMUM_OPERABLE_DBFS_LEVEL);
      81              : 
      82            0 :     AudioSignalVal& signalVal = m_signalValuesMap[ch];
      83              : 
      84            0 :     if (muse::is_equal(signalVal.pressure, newPressure)) {
      85            0 :         return;
      86              :     }
      87              : 
      88            0 :     if (std::abs(signalVal.pressure - newPressure) < PRESSURE_MINIMAL_VALUABLE_DIFF) {
      89            0 :         return;
      90              :     }
      91              : 
      92            0 :     signalVal.pressure = newPressure;
      93            0 :     m_shouldNotifyAboutChanges = true;
      94              : }
      95              : 
      96            0 : void SignalNode::notifyAboutChanges()
      97              : {
      98            0 :     if (m_shouldNotifyAboutChanges) {
      99            0 :         m_audioSignalChanges.send(m_signalValuesMap);
     100            0 :         m_shouldNotifyAboutChanges = false;
     101              :     }
     102            0 : }