mirror of
https://github.com/RGBCube/serenity
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369 lines
11 KiB
C++
369 lines
11 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2019-2020, William McPherson <willmcpherson2@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "Track.h"
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#include <AK/NumericLimits.h>
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#include <LibAudio/Loader.h>
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#include <math.h>
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Track::Track(const u32& time)
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: m_time(time)
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{
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set_sustain_impl(1000);
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set_attack(5);
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set_decay(1000);
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set_release(5);
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}
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Track::~Track()
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{
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}
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void Track::fill_sample(Sample& sample)
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{
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Audio::Sample new_sample;
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for (size_t note = 0; note < note_count; ++note) {
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if (!m_roll_iters[note].is_end()) {
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if (m_roll_iters[note]->on_sample == m_time) {
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set_note(note, On);
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} else if (m_roll_iters[note]->off_sample == m_time) {
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set_note(note, Off);
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++m_roll_iters[note];
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if (m_roll_iters[note].is_end())
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m_roll_iters[note] = m_roll_notes[note].begin();
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}
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}
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switch (m_envelope[note]) {
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case Done:
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continue;
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case Attack:
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m_power[note] += m_attack_step;
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if (m_power[note] >= 1) {
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m_power[note] = 1;
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m_envelope[note] = Decay;
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}
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break;
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case Decay:
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m_power[note] -= m_decay_step;
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if (m_power[note] < m_sustain_level)
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m_power[note] = m_sustain_level;
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break;
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case Release:
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m_power[note] -= m_release_step[note];
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if (m_power[note] <= 0) {
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m_power[note] = 0;
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m_envelope[note] = Done;
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continue;
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}
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break;
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default:
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ASSERT_NOT_REACHED();
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}
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Audio::Sample note_sample;
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switch (m_wave) {
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case Wave::Sine:
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note_sample = sine(note);
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break;
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case Wave::Saw:
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note_sample = saw(note);
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break;
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case Wave::Square:
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note_sample = square(note);
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break;
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case Wave::Triangle:
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note_sample = triangle(note);
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break;
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case Wave::Noise:
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note_sample = noise();
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break;
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case Wave::RecordedSample:
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note_sample = recorded_sample(note);
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break;
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default:
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ASSERT_NOT_REACHED();
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}
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new_sample.left += note_sample.left * m_power[note] * volume;
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new_sample.right += note_sample.right * m_power[note] * volume;
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}
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if (m_delay) {
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new_sample.left += m_delay_buffer[m_delay_index].left * 0.333333;
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new_sample.right += m_delay_buffer[m_delay_index].right * 0.333333;
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m_delay_buffer[m_delay_index].left = new_sample.left;
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m_delay_buffer[m_delay_index].right = new_sample.right;
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if (++m_delay_index >= m_delay_samples)
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m_delay_index = 0;
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}
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sample.left += new_sample.left;
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sample.right += new_sample.right;
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}
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void Track::reset()
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{
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memset(m_delay_buffer.data(), 0, m_delay_buffer.size() * sizeof(Sample));
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m_delay_index = 0;
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memset(m_note_on, 0, sizeof(m_note_on));
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memset(m_power, 0, sizeof(m_power));
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memset(m_envelope, 0, sizeof(m_envelope));
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}
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String Track::set_recorded_sample(const StringView& path)
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{
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NonnullRefPtr<Audio::Loader> loader = Audio::Loader::create(path);
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if (loader->has_error())
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return String(loader->error_string());
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auto buffer = loader->get_more_samples(60 * sample_rate * sizeof(Sample)); // 1 minute maximum
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if (!m_recorded_sample.is_empty())
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m_recorded_sample.clear();
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m_recorded_sample.resize(buffer->sample_count());
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double peak = 0;
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for (int i = 0; i < buffer->sample_count(); ++i) {
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double left_abs = fabs(buffer->samples()[i].left);
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double right_abs = fabs(buffer->samples()[i].right);
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if (left_abs > peak)
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peak = left_abs;
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if (right_abs > peak)
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peak = right_abs;
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}
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if (peak) {
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for (int i = 0; i < buffer->sample_count(); ++i) {
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m_recorded_sample[i].left = buffer->samples()[i].left / peak;
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m_recorded_sample[i].right = buffer->samples()[i].right / peak;
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}
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}
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return String::empty();
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}
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// All of the information for these waves is on Wikipedia.
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Audio::Sample Track::sine(size_t note)
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{
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double pos = note_frequencies[note] / sample_rate;
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double sin_step = pos * 2 * M_PI;
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double w = sin(m_pos[note]);
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m_pos[note] += sin_step;
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return w;
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}
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Audio::Sample Track::saw(size_t note)
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{
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double saw_step = note_frequencies[note] / sample_rate;
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double t = m_pos[note];
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double w = (0.5 - (t - floor(t))) * 2;
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m_pos[note] += saw_step;
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return w;
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}
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Audio::Sample Track::square(size_t note)
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{
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double pos = note_frequencies[note] / sample_rate;
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double square_step = pos * 2 * M_PI;
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double w = sin(m_pos[note]) >= 0 ? 1 : -1;
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m_pos[note] += square_step;
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return w;
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}
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Audio::Sample Track::triangle(size_t note)
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{
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double triangle_step = note_frequencies[note] / sample_rate;
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double t = m_pos[note];
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double w = fabs(fmod((4 * t) + 1, 4) - 2) - 1;
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m_pos[note] += triangle_step;
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return w;
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}
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Audio::Sample Track::noise() const
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{
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double random_percentage = static_cast<double>(rand()) / RAND_MAX;
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double w = (random_percentage * 2) - 1;
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return w;
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}
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Audio::Sample Track::recorded_sample(size_t note)
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{
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int t = m_pos[note];
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if (t >= static_cast<int>(m_recorded_sample.size()))
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return 0;
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double w_left = m_recorded_sample[t].left;
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double w_right = m_recorded_sample[t].right;
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if (t + 1 < static_cast<int>(m_recorded_sample.size())) {
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double t_fraction = m_pos[note] - t;
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w_left += (m_recorded_sample[t + 1].left - m_recorded_sample[t].left) * t_fraction;
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w_right += (m_recorded_sample[t + 1].right - m_recorded_sample[t].right) * t_fraction;
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}
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double recorded_sample_step = note_frequencies[note] / middle_c;
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m_pos[note] += recorded_sample_step;
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return { w_left, w_right };
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}
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static inline double calculate_step(double distance, int milliseconds)
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{
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if (milliseconds == 0)
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return distance;
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constexpr double samples_per_millisecond = sample_rate / 1000.0;
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double samples = milliseconds * samples_per_millisecond;
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double step = distance / samples;
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return step;
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}
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void Track::set_note(int note, Switch switch_note)
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{
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ASSERT(note >= 0 && note < note_count);
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if (switch_note == On) {
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if (m_note_on[note] == 0) {
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m_pos[note] = 0;
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m_envelope[note] = Attack;
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}
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++m_note_on[note];
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} else {
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if (m_note_on[note] >= 1) {
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if (m_note_on[note] == 1) {
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m_release_step[note] = calculate_step(m_power[note], m_release);
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m_envelope[note] = Release;
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}
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--m_note_on[note];
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}
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}
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ASSERT(m_note_on[note] != NumericLimits<u8>::max());
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ASSERT(m_power[note] >= 0);
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}
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void Track::sync_roll(int note)
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{
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auto it = m_roll_notes[note].find([&](auto& roll_note) { return roll_note.off_sample > m_time; });
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if (it.is_end())
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m_roll_iters[note] = m_roll_notes[note].begin();
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else
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m_roll_iters[note] = it;
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}
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void Track::set_roll_note(int note, u32 on_sample, u32 off_sample)
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{
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RollNote new_roll_note = { on_sample, off_sample };
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ASSERT(note >= 0 && note < note_count);
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ASSERT(new_roll_note.off_sample < roll_length);
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ASSERT(new_roll_note.length() >= 2);
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for (auto it = m_roll_notes[note].begin(); !it.is_end();) {
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if (it->on_sample > new_roll_note.off_sample) {
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m_roll_notes[note].insert_before(it, new_roll_note);
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sync_roll(note);
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return;
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}
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if (it->on_sample <= new_roll_note.on_sample && it->off_sample >= new_roll_note.on_sample) {
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if (m_time >= it->on_sample && m_time <= it->off_sample)
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set_note(note, Off);
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m_roll_notes[note].remove(it);
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sync_roll(note);
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return;
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}
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if ((new_roll_note.on_sample == 0 || it->on_sample >= new_roll_note.on_sample - 1) && it->on_sample <= new_roll_note.off_sample) {
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if (m_time >= new_roll_note.off_sample && m_time <= it->off_sample)
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set_note(note, Off);
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m_roll_notes[note].remove(it);
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it = m_roll_notes[note].begin();
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continue;
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}
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++it;
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}
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m_roll_notes[note].append(new_roll_note);
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sync_roll(note);
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}
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void Track::set_wave(int wave)
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{
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ASSERT(wave >= first_wave && wave <= last_wave);
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m_wave = wave;
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}
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void Track::set_wave(Direction direction)
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{
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if (direction == Up) {
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if (++m_wave > last_wave)
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m_wave = first_wave;
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} else {
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if (--m_wave < first_wave)
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m_wave = last_wave;
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}
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}
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void Track::set_attack(int attack)
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{
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ASSERT(attack >= 0);
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m_attack = attack;
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m_attack_step = calculate_step(1, m_attack);
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}
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void Track::set_decay(int decay)
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{
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ASSERT(decay >= 0);
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m_decay = decay;
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m_decay_step = calculate_step(1 - m_sustain_level, m_decay);
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}
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void Track::set_sustain_impl(int sustain)
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{
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ASSERT(sustain >= 0);
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m_sustain = sustain;
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m_sustain_level = sustain / 1000.0;
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}
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void Track::set_sustain(int sustain)
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{
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set_sustain_impl(sustain);
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set_decay(m_decay);
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}
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void Track::set_release(int release)
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{
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ASSERT(release >= 0);
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m_release = release;
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}
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void Track::set_delay(int delay)
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{
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ASSERT(delay >= 0);
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m_delay = delay;
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m_delay_samples = m_delay == 0 ? 0 : (sample_rate / (beats_per_minute / 60)) / m_delay;
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m_delay_buffer.resize(m_delay_samples);
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memset(m_delay_buffer.data(), 0, m_delay_buffer.size() * sizeof(Sample));
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m_delay_index = 0;
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}
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