137 lines
6.9 KiB
C++
137 lines
6.9 KiB
C++
/*
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* Copyright (C) 2010, Google Inc. All rights reserved.
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* Copyright (C) 2020, Apple Inc. 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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "AudioBufferSourceOptions.h"
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#include "AudioScheduledSourceNode.h"
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#include <wtf/Lock.h>
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#include <wtf/UniqueArray.h>
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namespace WebCore {
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class AudioBuffer;
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struct AudioBufferSourceOptions;
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// AudioBufferSourceNode is an AudioNode representing an audio source from an in-memory audio asset represented by an AudioBuffer.
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// It generally will be used for short sounds which require a high degree of scheduling flexibility (can playback in rhythmically perfect ways).
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class AudioBufferSourceNode final : public AudioScheduledSourceNode {
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WTF_MAKE_ISO_ALLOCATED(AudioBufferSourceNode);
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public:
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static Ref<AudioBufferSourceNode> create(BaseAudioContext&, float sampleRate);
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static ExceptionOr<Ref<AudioBufferSourceNode>> create(BaseAudioContext&, AudioBufferSourceOptions&& = { });
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virtual ~AudioBufferSourceNode();
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// AudioNode
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void process(size_t framesToProcess) final;
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// setBufferForBindings() is called on the main thread. This is the buffer we use for playback.
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ExceptionOr<void> setBufferForBindings(RefPtr<AudioBuffer>&&);
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// This function does not lock before accessing the buffer and should therefore only be called on the main thread.
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AudioBuffer* bufferForBindings() WTF_IGNORES_THREAD_SAFETY_ANALYSIS { ASSERT(isMainThread()); return m_buffer.get(); }
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// numberOfChannels() returns the number of output channels. This value equals the number of channels from the buffer.
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// If a new buffer is set with a different number of channels, then this value will dynamically change.
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unsigned numberOfChannels();
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// Play-state
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ExceptionOr<void> startLater(double when, double grainOffset, std::optional<double> grainDuration);
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// This function doesn't grab the lock before accessing m_isLooping and is thus only safe to call on the main thread.
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bool loopForBindings() const WTF_IGNORES_THREAD_SAFETY_ANALYSIS { ASSERT(isMainThread()); return m_isLooping; }
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void setLoopForBindings(bool);
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// Loop times in seconds.
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double loopStartForBindings() const WTF_IGNORES_THREAD_SAFETY_ANALYSIS { ASSERT(isMainThread()); return m_loopStart; } // This function doesn't grab the lock and is thus only safe to call on the main thread.
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double loopEndForBindings() const WTF_IGNORES_THREAD_SAFETY_ANALYSIS { ASSERT(isMainThread()); return m_loopEnd; } // This function doesn't grab the lock and is thus only safe to call on the main thread.
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void setLoopStartForBindings(double);
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void setLoopEndForBindings(double);
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AudioParam& detune() { return m_detune.get(); }
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AudioParam& playbackRate() { return m_playbackRate.get(); }
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// If we are no longer playing, propogate silence ahead to downstream nodes.
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bool propagatesSilence() const final;
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const char* activeDOMObjectName() const override { return "AudioBufferSourceNode"; }
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protected:
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explicit AudioBufferSourceNode(BaseAudioContext&);
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private:
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double tailTime() const final { return 0; }
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double latencyTime() const final { return 0; }
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ExceptionOr<void> startPlaying(double when, double grainOffset, std::optional<double> grainDuration);
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void adjustGrainParameters() WTF_REQUIRES_LOCK(m_processLock);
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// Returns true on success.
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bool renderFromBuffer(AudioBus*, unsigned destinationFrameOffset, size_t numberOfFrames, double startFrameOffset) WTF_REQUIRES_LOCK(m_processLock);
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// Render silence starting from "index" frame in AudioBus.
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inline bool renderSilenceAndFinishIfNotLooping(AudioBus*, unsigned index, size_t framesToProcess) WTF_REQUIRES_LOCK(m_processLock);
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// m_buffer holds the sample data which this node outputs.
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RefPtr<AudioBuffer> m_buffer WTF_GUARDED_BY_LOCK(m_processLock); // Only modified on the main thread but used on the audio thread.
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// Pointers for the buffer and destination.
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UniqueArray<const float*> m_sourceChannels;
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UniqueArray<float*> m_destinationChannels;
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Ref<AudioParam> m_detune;
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Ref<AudioParam> m_playbackRate;
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// If m_isLooping is false, then this node will be done playing and become inactive after it reaches the end of the sample data in the buffer.
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// If true, it will wrap around to the start of the buffer each time it reaches the end.
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bool m_isLooping WTF_GUARDED_BY_LOCK(m_processLock) { false }; // Only modified on the main thread but queried on the audio thread.
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bool m_wasBufferSet { false };
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double m_loopStart WTF_GUARDED_BY_LOCK(m_processLock) { 0 }; // Only modified on the main thread but queried on the audio thread.
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double m_loopEnd WTF_GUARDED_BY_LOCK(m_processLock) { 0 }; // Only modified on the main thread but queried on the audio thread.
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// m_virtualReadIndex is a sample-frame index into our buffer representing the current playback position.
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// Since it's floating-point, it has sub-sample accuracy.
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double m_virtualReadIndex { 0 };
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// Granular playback
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bool m_isGrain WTF_GUARDED_BY_LOCK(m_processLock) { false };
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double m_grainOffset WTF_GUARDED_BY_LOCK(m_processLock) { 0 }; // in seconds
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double m_grainDuration WTF_GUARDED_BY_LOCK(m_processLock); // in seconds
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double m_wasGrainDurationGiven WTF_GUARDED_BY_LOCK(m_processLock) { false };
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// totalPitchRate() returns the instantaneous pitch rate (non-time preserving).
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// It incorporates the base pitch rate, any sample-rate conversion factor from the buffer.
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double totalPitchRate() WTF_REQUIRES_LOCK(m_processLock);
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// This synchronizes process() with setBuffer() which can cause dynamic channel count changes.
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mutable Lock m_processLock;
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};
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} // namespace WebCore
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