mirror of
https://github.com/RGBCube/serenity
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5d180d1f99
(...and ASSERT_NOT_REACHED => VERIFY_NOT_REACHED) Since all of these checks are done in release builds as well, let's rename them to VERIFY to prevent confusion, as everyone is used to assertions being compiled out in release. We can introduce a new ASSERT macro that is specifically for debug checks, but I'm doing this wholesale conversion first since we've accumulated thousands of these already, and it's not immediately obvious which ones are suitable for ASSERT.
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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VERIFY_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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VERIFY_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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VERIFY(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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VERIFY(m_note_on[note] != NumericLimits<u8>::max());
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VERIFY(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_if([&](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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VERIFY(note >= 0 && note < note_count);
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VERIFY(new_roll_note.off_sample < roll_length);
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VERIFY(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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VERIFY(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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VERIFY(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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VERIFY(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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VERIFY(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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VERIFY(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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VERIFY(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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