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93 lines
2.8 KiB
C++
93 lines
2.8 KiB
C++
/*
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* Copyright (c) 2021, kleines Filmröllchen <filmroellchen@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "Effects.h"
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#include <AK/FixedArray.h>
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#include <math.h>
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namespace DSP::Effects {
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Delay::Delay(NonnullRefPtr<Transport> transport)
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: EffectProcessor(move(transport))
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, m_delay_decay("Decay"sv, 0.01, 0.99, 0.33, Logarithmic::No)
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, m_delay_time("Delay Time"sv, 3, 2000, 900, Logarithmic::Yes)
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, m_dry_gain("Dry"sv, 0, 1, 0.9, Logarithmic::No)
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{
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m_parameters.append(m_delay_decay);
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m_parameters.append(m_delay_time);
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m_parameters.append(m_dry_gain);
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m_delay_time.register_change_listener([this](auto const&) {
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this->handle_delay_time_change();
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});
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handle_delay_time_change();
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}
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void Delay::handle_delay_time_change()
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{
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// We want a delay buffer that can hold samples filling the specified number of milliseconds.
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double seconds = static_cast<double>(m_delay_time) / 1000.0;
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size_t sample_count = ceil(seconds * m_transport->sample_rate());
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if (sample_count != m_delay_buffer.size()) {
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m_delay_buffer.resize(sample_count, true);
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m_delay_index %= max(m_delay_buffer.size(), 1);
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}
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}
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void Delay::process_impl(Signal const& input_signal, Signal& output_signal)
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{
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auto const& samples = input_signal.get<FixedArray<Sample>>();
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auto& output = output_signal.get<FixedArray<Sample>>();
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for (size_t i = 0; i < output.size(); ++i) {
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auto& out = output[i];
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auto const& sample = samples[i];
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out += sample.log_multiplied(static_cast<double>(m_dry_gain));
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out += m_delay_buffer[m_delay_index].log_multiplied(m_delay_decay);
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// This is also convenient for disabling the delay effect by setting the buffer size to 0
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if (m_delay_buffer.size() >= 1)
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m_delay_buffer[m_delay_index++] = out;
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if (m_delay_index >= m_delay_buffer.size())
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m_delay_index = 0;
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}
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}
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Mastering::Mastering(NonnullRefPtr<Transport> transport)
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: EffectProcessor(move(transport))
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, m_pan("Pan", -1, 1, 0, Logarithmic::No)
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, m_volume("Volume", 0, 1, 1, Logarithmic::No)
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, m_muted("Mute", false)
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{
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m_parameters.append(m_muted);
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m_parameters.append(m_volume);
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m_parameters.append(m_pan);
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}
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void Mastering::process_impl(Signal const& input_signal, Signal& output)
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{
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process_to_fixed_array(input_signal, output.get<FixedArray<Sample>>());
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}
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void Mastering::process_to_fixed_array(Signal const& input_signal, FixedArray<Sample>& output)
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{
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if (m_muted) {
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output.fill_with({});
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return;
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}
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auto const& input = input_signal.get<FixedArray<Sample>>();
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for (size_t i = 0; i < input.size(); ++i) {
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auto sample = input[i];
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sample.log_multiply(static_cast<float>(m_volume));
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sample.pan(static_cast<float>(m_pan));
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output[i] = sample;
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}
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}
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}
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