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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
* Copyright (C) 2016-2020 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "ActiveDOMObject.h"
#include "AsyncAudioDecoder.h"
#include "AudioBus.h"
#include "AudioDestinationNode.h"
#include "EventTarget.h"
#include "MediaCanStartListener.h"
#include "MediaProducer.h"
#include "PlatformMediaSession.h"
#include "ScriptExecutionContext.h"
#include "VisibilityChangeClient.h"
#include <JavaScriptCore/ConsoleTypes.h>
#include <JavaScriptCore/Float32Array.h>
#include <atomic>
#include <wtf/HashSet.h>
#include <wtf/LoggerHelper.h>
#include <wtf/MainThread.h>
#include <wtf/RefPtr.h>
#include <wtf/ThreadSafeRefCounted.h>
#include <wtf/Threading.h>
#include <wtf/UniqueRef.h>
#include <wtf/Vector.h>
#include <wtf/text/AtomStringHash.h>
namespace WebCore {
class AnalyserNode;
class AudioBuffer;
class AudioBufferCallback;
class AudioBufferSourceNode;
class AudioListener;
class AudioSummingJunction;
class BiquadFilterNode;
class ChannelMergerNode;
class ChannelSplitterNode;
class ConvolverNode;
class DelayNode;
class Document;
class DynamicsCompressorNode;
class GainNode;
class HTMLMediaElement;
class MainThreadGenericEventQueue;
class MediaElementAudioSourceNode;
class MediaStream;
class MediaStreamAudioDestinationNode;
class MediaStreamAudioSourceNode;
class OscillatorNode;
class PannerNode;
class PeriodicWave;
class ScriptProcessorNode;
class SecurityOrigin;
class WaveShaperNode;
template<typename IDLType> class DOMPromiseDeferred;
// AudioContext is the cornerstone of the web audio API and all AudioNodes are created from it.
// For thread safety between the audio thread and the main thread, it has a rendering graph locking mechanism.
class AudioContext
: public ActiveDOMObject
, public ThreadSafeRefCounted<AudioContext>
, public EventTargetWithInlineData
, public MediaCanStartListener
, public MediaProducer
, private PlatformMediaSessionClient
, private VisibilityChangeClient
#if !RELEASE_LOG_DISABLED
, private LoggerHelper
#endif
{
WTF_MAKE_ISO_ALLOCATED(AudioContext);
public:
// Create an AudioContext for rendering to the audio hardware.
static RefPtr<AudioContext> create(Document&);
virtual ~AudioContext();
bool isInitialized() const;
bool isOfflineContext() const { return m_isOfflineContext; }
Document* document() const; // ASSERTs if document no longer exists.
DocumentIdentifier hostingDocumentIdentifier() const final;
AudioDestinationNode* destination() { return m_destinationNode.get(); }
size_t currentSampleFrame() const { return m_destinationNode ? m_destinationNode->currentSampleFrame() : 0; }
double currentTime() const { return m_destinationNode ? m_destinationNode->currentTime() : 0.; }
float sampleRate() const { return m_destinationNode ? m_destinationNode->sampleRate() : 0.f; }
unsigned long activeSourceCount() const { return static_cast<unsigned long>(m_activeSourceCount); }
void incrementActiveSourceCount();
void decrementActiveSourceCount();
ExceptionOr<Ref<AudioBuffer>> createBuffer(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate);
ExceptionOr<Ref<AudioBuffer>> createBuffer(ArrayBuffer&, bool mixToMono);
// Asynchronous audio file data decoding.
void decodeAudioData(Ref<ArrayBuffer>&&, RefPtr<AudioBufferCallback>&&, RefPtr<AudioBufferCallback>&&);
AudioListener* listener() { return m_listener.get(); }
void suspendRendering(DOMPromiseDeferred<void>&&);
void resumeRendering(DOMPromiseDeferred<void>&&);
void close(DOMPromiseDeferred<void>&&);
enum class State { Suspended, Running, Interrupted, Closed };
State state() const;
bool isClosed() const { return m_state == State::Closed; }
bool wouldTaintOrigin(const URL&) const;
// The AudioNode create methods are called on the main thread (from JavaScript).
ExceptionOr<Ref<AudioBufferSourceNode>> createBufferSource();
#if ENABLE(VIDEO)
ExceptionOr<Ref<MediaElementAudioSourceNode>> createMediaElementSource(HTMLMediaElement&);
#endif
#if ENABLE(MEDIA_STREAM)
ExceptionOr<Ref<MediaStreamAudioSourceNode>> createMediaStreamSource(MediaStream&);
ExceptionOr<Ref<MediaStreamAudioDestinationNode>> createMediaStreamDestination();
#endif
ExceptionOr<Ref<GainNode>> createGain();
ExceptionOr<Ref<BiquadFilterNode>> createBiquadFilter();
ExceptionOr<Ref<WaveShaperNode>> createWaveShaper();
ExceptionOr<Ref<DelayNode>> createDelay(double maxDelayTime);
ExceptionOr<Ref<PannerNode>> createPanner();
ExceptionOr<Ref<ConvolverNode>> createConvolver();
ExceptionOr<Ref<DynamicsCompressorNode>> createDynamicsCompressor();
ExceptionOr<Ref<AnalyserNode>> createAnalyser();
ExceptionOr<Ref<ScriptProcessorNode>> createScriptProcessor(size_t bufferSize, size_t numberOfInputChannels, size_t numberOfOutputChannels);
ExceptionOr<Ref<ChannelSplitterNode>> createChannelSplitter(size_t numberOfOutputs);
ExceptionOr<Ref<ChannelMergerNode>> createChannelMerger(size_t numberOfInputs);
ExceptionOr<Ref<OscillatorNode>> createOscillator();
ExceptionOr<Ref<PeriodicWave>> createPeriodicWave(Float32Array& real, Float32Array& imaginary);
// When a source node has no more processing to do (has finished playing), then it tells the context to dereference it.
void notifyNodeFinishedProcessing(AudioNode*);
// Called at the start of each render quantum.
void handlePreRenderTasks();
// Called at the end of each render quantum.
void handlePostRenderTasks();
// Called periodically at the end of each render quantum to dereference finished source nodes.
void derefFinishedSourceNodes();
// We schedule deletion of all marked nodes at the end of each realtime render quantum.
void markForDeletion(AudioNode&);
void deleteMarkedNodes();
// AudioContext can pull node(s) at the end of each render quantum even when they are not connected to any downstream nodes.
// These two methods are called by the nodes who want to add/remove themselves into/from the automatic pull lists.
void addAutomaticPullNode(AudioNode&);
void removeAutomaticPullNode(AudioNode&);
// Called right before handlePostRenderTasks() to handle nodes which need to be pulled even when they are not connected to anything.
void processAutomaticPullNodes(size_t framesToProcess);
// Keeps track of the number of connections made.
void incrementConnectionCount()
{
ASSERT(isMainThread());
m_connectionCount++;
}
unsigned connectionCount() const { return m_connectionCount; }
//
// Thread Safety and Graph Locking:
//
void setAudioThread(Thread& thread) { m_audioThread = &thread; } // FIXME: check either not initialized or the same
Thread* audioThread() const { return m_audioThread; }
bool isAudioThread() const;
// Returns true only after the audio thread has been started and then shutdown.
bool isAudioThreadFinished() { return m_isAudioThreadFinished; }
// mustReleaseLock is set to true if we acquired the lock in this method call and caller must unlock(), false if it was previously acquired.
void lock(bool& mustReleaseLock);
// Returns true if we own the lock.
// mustReleaseLock is set to true if we acquired the lock in this method call and caller must unlock(), false if it was previously acquired.
bool tryLock(bool& mustReleaseLock);
void unlock();
// Returns true if this thread owns the context's lock.
bool isGraphOwner() const;
// Returns the maximum number of channels we can support.
static unsigned maxNumberOfChannels() { return MaxNumberOfChannels; }
class AutoLocker {
public:
explicit AutoLocker(AudioContext& context)
: m_context(context)
{
m_context.lock(m_mustReleaseLock);
}
~AutoLocker()
{
if (m_mustReleaseLock)
m_context.unlock();
}
private:
AudioContext& m_context;
bool m_mustReleaseLock;
};
// In AudioNode::deref() a tryLock() is used for calling finishDeref(), but if it fails keep track here.
void addDeferredFinishDeref(AudioNode*);
// In the audio thread at the start of each render cycle, we'll call handleDeferredFinishDerefs().
void handleDeferredFinishDerefs();
// Only accessed when the graph lock is held.
void markSummingJunctionDirty(AudioSummingJunction*);
void markAudioNodeOutputDirty(AudioNodeOutput*);
// Must be called on main thread.
void removeMarkedSummingJunction(AudioSummingJunction*);
// EventTarget
EventTargetInterface eventTargetInterface() const final { return AudioContextEventTargetInterfaceType; }
// Reconcile ref/deref which are defined both in ThreadSafeRefCounted and EventTarget.
using ThreadSafeRefCounted::ref;
using ThreadSafeRefCounted::deref;
void startRendering();
void finishedRendering(bool didRendering);
static unsigned s_hardwareContextCount;
// Restrictions to change default behaviors.
enum BehaviorRestrictionFlags {
NoRestrictions = 0,
RequireUserGestureForAudioStartRestriction = 1 << 0,
RequirePageConsentForAudioStartRestriction = 1 << 1,
};
typedef unsigned BehaviorRestrictions;
BehaviorRestrictions behaviorRestrictions() const { return m_restrictions; }
void addBehaviorRestriction(BehaviorRestrictions restriction) { m_restrictions |= restriction; }
void removeBehaviorRestriction(BehaviorRestrictions restriction) { m_restrictions &= ~restriction; }
void isPlayingAudioDidChange();
void nodeWillBeginPlayback();
#if !RELEASE_LOG_DISABLED
const Logger& logger() const final { return m_logger.get(); }
const void* logIdentifier() const final { return m_logIdentifier; }
WTFLogChannel& logChannel() const final;
const void* nextAudioNodeLogIdentifier() { return childLogIdentifier(m_logIdentifier, ++m_nextAudioNodeIdentifier); }
const void* nextAudioParameterLogIdentifier() { return childLogIdentifier(m_logIdentifier, ++m_nextAudioParameterIdentifier); }
#endif
void postTask(WTF::Function<void()>&&);
bool isStopped() const { return m_isStopScheduled; }
const SecurityOrigin* origin() const;
void addConsoleMessage(MessageSource, MessageLevel, const String& message);
// EventTarget
ScriptExecutionContext* scriptExecutionContext() const final;
protected:
explicit AudioContext(Document&);
AudioContext(Document&, AudioBuffer* renderTarget);
static bool isSampleRateRangeGood(float sampleRate);
void clearPendingActivity();
void makePendingActivity();
private:
void constructCommon();
void lazyInitialize();
void uninitialize();
bool willBeginPlayback();
bool willPausePlayback();
bool userGestureRequiredForAudioStart() const { return !isOfflineContext() && m_restrictions & RequireUserGestureForAudioStartRestriction; }
bool pageConsentRequiredForAudioStart() const { return !isOfflineContext() && m_restrictions & RequirePageConsentForAudioStartRestriction; }
void setState(State);
void clear();
void scheduleNodeDeletion();
void mediaCanStart(Document&) override;
// EventTarget
void dispatchEvent(Event&) final;
// MediaProducer
MediaProducer::MediaStateFlags mediaState() const override;
void pageMutedStateDidChange() override;
// The context itself keeps a reference to all source nodes. The source nodes, then reference all nodes they're connected to.
// In turn, these nodes reference all nodes they're connected to. All nodes are ultimately connected to the AudioDestinationNode.
// When the context dereferences a source node, it will be deactivated from the rendering graph along with all other nodes it is
// uniquely connected to. See the AudioNode::ref() and AudioNode::deref() methods for more details.
void refNode(AudioNode&);
void derefNode(AudioNode&);
// ActiveDOMObject API.
void suspend(ReasonForSuspension) final;
void resume() final;
void stop() override;
const char* activeDOMObjectName() const override;
// When the context goes away, there might still be some sources which haven't finished playing.
// Make sure to dereference them here.
void derefUnfinishedSourceNodes();
// PlatformMediaSessionClient
PlatformMediaSession::MediaType mediaType() const override { return PlatformMediaSession::MediaType::WebAudio; }
PlatformMediaSession::MediaType presentationType() const override { return PlatformMediaSession::MediaType::WebAudio; }
void mayResumePlayback(bool shouldResume) override;
void suspendPlayback() override;
bool canReceiveRemoteControlCommands() const override { return false; }
void didReceiveRemoteControlCommand(PlatformMediaSession::RemoteControlCommandType, const PlatformMediaSession::RemoteCommandArgument*) override { }
bool supportsSeeking() const override { return false; }
bool shouldOverrideBackgroundPlaybackRestriction(PlatformMediaSession::InterruptionType) const override { return false; }
bool canProduceAudio() const final { return true; }
bool isSuspended() const final;
void visibilityStateChanged() final;
// EventTarget
void refEventTarget() override { ref(); }
void derefEventTarget() override { deref(); }
void handleDirtyAudioSummingJunctions();
void handleDirtyAudioNodeOutputs();
void addReaction(State, DOMPromiseDeferred<void>&&);
void updateAutomaticPullNodes();
#if !RELEASE_LOG_DISABLED
const char* logClassName() const final { return "AudioContext"; }
Ref<Logger> m_logger;
const void* m_logIdentifier;
uint64_t m_nextAudioNodeIdentifier { 0 };
uint64_t m_nextAudioParameterIdentifier { 0 };
#endif
// Only accessed in the audio thread.
Vector<AudioNode*> m_finishedNodes;
// We don't use RefPtr<AudioNode> here because AudioNode has a more complex ref() / deref() implementation
// with an optional argument for refType. We need to use the special refType: RefTypeConnection
// Either accessed when the graph lock is held, or on the main thread when the audio thread has finished.
Vector<AudioNode*> m_referencedNodes;
// Accumulate nodes which need to be deleted here.
// This is copied to m_nodesToDelete at the end of a render cycle in handlePostRenderTasks(), where we're assured of a stable graph
// state which will have no references to any of the nodes in m_nodesToDelete once the context lock is released
// (when handlePostRenderTasks() has completed).
Vector<AudioNode*> m_nodesMarkedForDeletion;
// They will be scheduled for deletion (on the main thread) at the end of a render cycle (in realtime thread).
Vector<AudioNode*> m_nodesToDelete;
bool m_isDeletionScheduled { false };
bool m_isStopScheduled { false };
bool m_isInitialized { false };
bool m_isAudioThreadFinished { false };
bool m_automaticPullNodesNeedUpdating { false };
bool m_isOfflineContext { false };
// Only accessed when the graph lock is held.
HashSet<AudioSummingJunction*> m_dirtySummingJunctions;
HashSet<AudioNodeOutput*> m_dirtyAudioNodeOutputs;
// For the sake of thread safety, we maintain a seperate Vector of automatic pull nodes for rendering in m_renderingAutomaticPullNodes.
// It will be copied from m_automaticPullNodes by updateAutomaticPullNodes() at the very start or end of the rendering quantum.
HashSet<AudioNode*> m_automaticPullNodes;
Vector<AudioNode*> m_renderingAutomaticPullNodes;
// Only accessed in the audio thread.
Vector<AudioNode*> m_deferredFinishDerefList;
Vector<Vector<DOMPromiseDeferred<void>>> m_stateReactions;
std::unique_ptr<PlatformMediaSession> m_mediaSession;
UniqueRef<MainThreadGenericEventQueue> m_eventQueue;
RefPtr<AudioBuffer> m_renderTarget;
RefPtr<AudioDestinationNode> m_destinationNode;
RefPtr<AudioListener> m_listener;
unsigned m_connectionCount { 0 };
// Graph locking.
Lock m_contextGraphMutex;
// FIXME: Using volatile seems incorrect.
// https://bugs.webkit.org/show_bug.cgi?id=180332
Thread* volatile m_audioThread { nullptr };
Thread* volatile m_graphOwnerThread { nullptr }; // if the lock is held then this is the thread which owns it, otherwise == nullptr.
std::unique_ptr<AsyncAudioDecoder> m_audioDecoder;
// This is considering 32 is large enough for multiple channels audio.
// It is somewhat arbitrary and could be increased if necessary.
enum { MaxNumberOfChannels = 32 };
// Number of AudioBufferSourceNodes that are active (playing).
std::atomic<int> m_activeSourceCount { 0 };
BehaviorRestrictions m_restrictions { NoRestrictions };
State m_state { State::Suspended };
RefPtr<PendingActivity<AudioContext>> m_pendingActivity;
};
// FIXME: Find out why these ==/!= functions are needed and remove them if possible.
inline bool operator==(const AudioContext& lhs, const AudioContext& rhs)
{
return &lhs == &rhs;
}
inline bool operator!=(const AudioContext& lhs, const AudioContext& rhs)
{
return &lhs != &rhs;
}
inline AudioContext::State AudioContext::state() const
{
return m_state;
}
} // WebCore