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9035d9e845
This has mainly performance benefits, so that we only need to call into all processors once for every audio buffer segment. It requires adjusting quite some logic in most processors and in Track, as we have to consider a larger collection of notes and samples at each step. There's some cautionary TODOs in the currently unused LibDSP tracks because they don't do things properly yet.
85 lines
2.7 KiB
C++
85 lines
2.7 KiB
C++
/*
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* Copyright (c) 2021-2022, 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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#pragma once
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#include <AK/NonnullRefPtrVector.h>
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#include <AK/RefCounted.h>
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#include <AK/RefPtr.h>
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#include <LibDSP/Clip.h>
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#include <LibDSP/Music.h>
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#include <LibDSP/Processor.h>
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namespace LibDSP {
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// A track is also known as a channel and serves as a container for the audio pipeline: clips -> processors -> mixing & output
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class Track : public RefCounted<Track> {
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public:
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virtual ~Track() = default;
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virtual bool check_processor_chain_valid() const = 0;
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bool add_processor(NonnullRefPtr<Processor> new_processor);
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// Creates the current signal of the track by processing current note or audio data through the processing chain.
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void current_signal(FixedArray<Sample>& output_signal);
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// We are informed of an audio buffer size change. This happens off-audio-thread so we can allocate.
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ErrorOr<void> resize_internal_buffers_to(size_t buffer_size);
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NonnullRefPtrVector<Processor> const& processor_chain() const { return m_processor_chain; }
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NonnullRefPtr<Transport const> transport() const { return m_transport; }
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protected:
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Track(NonnullRefPtr<Transport> transport)
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: m_transport(move(transport))
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{
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}
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bool check_processor_chain_valid_with_initial_type(SignalType initial_type) const;
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// Subclasses override to provide the base signal to the processing chain
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virtual void compute_current_clips_signal() = 0;
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NonnullRefPtrVector<Processor> m_processor_chain;
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NonnullRefPtr<Transport> m_transport;
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// The current signal is stored here, to prevent unnecessary reallocation.
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Signal m_current_signal { FixedArray<Sample> {} };
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// These are so that we don't have to allocate a secondary buffer in current_signal().
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// A sample buffer possibly used by the processor chain.
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Signal m_secondary_sample_buffer { FixedArray<Sample> {} };
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// A note buffer possibly used by the processor chain.
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Signal m_secondary_note_buffer { RollNotes {} };
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};
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class NoteTrack final : public Track {
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public:
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virtual ~NoteTrack() override = default;
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bool check_processor_chain_valid() const override;
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NonnullRefPtrVector<NoteClip> const& clips() const { return m_clips; }
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protected:
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void compute_current_clips_signal() override;
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private:
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NonnullRefPtrVector<NoteClip> m_clips;
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};
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class AudioTrack final : public Track {
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public:
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virtual ~AudioTrack() override = default;
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bool check_processor_chain_valid() const override;
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NonnullRefPtrVector<AudioClip> const& clips() const { return m_clips; }
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protected:
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void compute_current_clips_signal() override;
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private:
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NonnullRefPtrVector<AudioClip> m_clips;
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};
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}
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