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              : 
      23              : #ifndef MUSE_AUDIO_AUDIOMATHUTILS_H
      24              : #define MUSE_AUDIO_AUDIOMATHUTILS_H
      25              : 
      26              : #include <cstdlib>
      27              : #include <limits>
      28              : 
      29              : #include "audio/common/audiotypes.h"
      30              : 
      31              : namespace muse::audio::dsp {
      32            0 : inline float balanceGain(const balance_t balance, const int audioChannelNumber)
      33              : {
      34            0 :     return (audioChannelNumber * 2 - 1) * balance + 1.f;
      35              : }
      36              : 
      37              : inline float samplesRootMeanSquare(const float squaredSum, const samples_t sampleCount)
      38              : {
      39              :     return std::sqrt(squaredSum / sampleCount);
      40              : }
      41              : 
      42            0 : inline float sampleAttackTimeCoefficient(const unsigned int sampleRate, const float attackTimeInSecs)
      43              : {
      44            0 :     return std::exp(-std::log(9) / (sampleRate * attackTimeInSecs));
      45              : }
      46              : 
      47            0 : inline float sampleReleaseTimeCoefficient(const unsigned int sampleRate, const float releaseTimeInSecs)
      48              : {
      49            0 :     return std::exp(-std::log(9) / (sampleRate * releaseTimeInSecs));
      50              : }
      51              : 
      52            0 : inline void multiplySamples(float* buffer, const audioch_t& audioChannelsCount,
      53              :                             const audioch_t& audioChannelNumber, const samples_t& samplesPerChannel,
      54              :                             const float& multiplier)
      55              : {
      56            0 :     for (samples_t i = 0; i < samplesPerChannel; ++i) {
      57            0 :         int idx = i * audioChannelsCount + audioChannelNumber;
      58              : 
      59            0 :         buffer[idx] *= multiplier;
      60              :     }
      61            0 : }
      62              : 
      63              : template<typename T>
      64            0 : constexpr T convertFloatSamples(const float value, const int bits)
      65              : {
      66            0 :     const int64_t max_val = (1LL << (bits - 1)) - 1LL;
      67            0 :     const float clampedValue = std::clamp(value, -1.0f, 1.0f);
      68            0 :     const float scaledValue = clampedValue * max_val;
      69            0 :     return static_cast<T>(std::round(scaledValue));
      70              : }
      71              : }
      72              : 
      73              : #endif // MUSE_AUDIO_AUDIOMATHUTILS_H