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00e13b5b27
That's the standard naming convention, but I didn't follow it when originally creating LibDSP and nobody corrected me, so here I am one year later :^)
124 lines
4.1 KiB
C++
124 lines
4.1 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 <AK/FixedArray.h>
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#include <AK/NoAllocationGuard.h>
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#include <AK/Optional.h>
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#include <AK/StdLibExtras.h>
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#include <AK/TypedTransfer.h>
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#include <AK/Types.h>
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#include <LibDSP/Music.h>
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#include <LibDSP/Processor.h>
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#include <LibDSP/Track.h>
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namespace DSP {
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bool Track::add_processor(NonnullRefPtr<Processor> new_processor)
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{
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m_processor_chain.append(move(new_processor));
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if (!check_processor_chain_valid()) {
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(void)m_processor_chain.take_last();
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return false;
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}
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return true;
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}
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bool Track::check_processor_chain_valid_with_initial_type(SignalType initial_type) const
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{
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Processor const* previous_processor = nullptr;
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for (auto& processor : m_processor_chain) {
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// The first processor must have the given initial signal type as input.
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if (previous_processor == nullptr) {
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if (processor.input_type() != initial_type)
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return false;
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} else if (previous_processor->output_type() != processor.input_type())
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return false;
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previous_processor = &processor;
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}
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return true;
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}
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bool AudioTrack::check_processor_chain_valid() const
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{
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return check_processor_chain_valid_with_initial_type(SignalType::Sample);
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}
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bool NoteTrack::check_processor_chain_valid() const
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{
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return check_processor_chain_valid_with_initial_type(SignalType::Note);
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}
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ErrorOr<void> Track::resize_internal_buffers_to(size_t buffer_size)
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{
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m_secondary_sample_buffer = TRY(FixedArray<Sample>::try_create(buffer_size));
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return {};
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}
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void Track::current_signal(FixedArray<Sample>& output_signal)
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{
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// This is real-time code. We must NEVER EVER EVER allocate.
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NoAllocationGuard guard;
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VERIFY(output_signal.size() == m_secondary_sample_buffer.get<FixedArray<Sample>>().size());
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compute_current_clips_signal();
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Signal* source_signal = &m_current_signal;
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// This provides an audio buffer of the right size. It is not allocated here, but whenever we are informed about a buffer size change.
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Signal* target_signal = &m_secondary_sample_buffer;
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for (auto& processor : m_processor_chain) {
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// Depending on what the processor needs to have as output, we need to place either a pre-allocated note hash map or a pre-allocated sample buffer in the target signal.
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if (processor.output_type() == SignalType::Note)
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target_signal = &m_secondary_note_buffer;
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else
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target_signal = &m_secondary_sample_buffer;
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processor.process(*source_signal, *target_signal);
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swap(source_signal, target_signal);
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}
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VERIFY(source_signal->type() == SignalType::Sample);
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VERIFY(output_signal.size() == source_signal->get<FixedArray<Sample>>().size());
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// This is one final unavoidable memcopy. Otherwise we need to special-case the last processor or
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AK::TypedTransfer<Sample>::copy(output_signal.data(), source_signal->get<FixedArray<Sample>>().data(), output_signal.size());
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}
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void NoteTrack::compute_current_clips_signal()
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{
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// Consider the entire time duration.
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TODO();
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u32 time = m_transport->time();
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// Find the currently playing clip.
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NoteClip* playing_clip = nullptr;
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for (auto& clip : m_clips) {
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if (clip.start() <= time && clip.end() >= time) {
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playing_clip = &clip;
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break;
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}
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}
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auto& current_notes = m_current_signal.get<RollNotes>();
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m_current_signal.get<RollNotes>().clear_with_capacity();
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if (playing_clip == nullptr)
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return;
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// FIXME: performance?
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for (auto const& note_list : playing_clip->notes()) {
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for (auto const& note : note_list) {
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if (note.on_sample >= time && note.off_sample >= time)
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break;
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if (note.on_sample <= time && note.off_sample >= time)
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current_notes.set(note.pitch, note);
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}
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}
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}
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void AudioTrack::compute_current_clips_signal()
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{
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// This is quite involved as we need to look at multiple clips and take looping into account.
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TODO();
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}
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}
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