Split "Online" and "Offline" AudioContext processing

Source/modules/webaudio/AbstractAudioContext.cpp

 /*
  * Copyright (C) 2010, Google 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.
  */
 
 #include "config.h"
 #if ENABLE(WEB_AUDIO)
-#include "modules/webaudio/AudioContext.h"
+#include "modules/webaudio/AbstractAudioContext.h"
 
 #include "bindings/core/v8/ExceptionMessages.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/ExecutionContextTask.h"
 #include "core/html/HTMLMediaElement.h"
 #include "modules/mediastream/MediaStream.h"
 #include "modules/webaudio/AnalyserNode.h"
 #include "modules/webaudio/AudioBuffer.h"
 #include "modules/webaudio/AudioBufferCallback.h"
 #include "modules/webaudio/AudioBufferSourceNode.h"
+#include "modules/webaudio/AudioContext.h"
 #include "modules/webaudio/AudioListener.h"
 #include "modules/webaudio/AudioNodeInput.h"
 #include "modules/webaudio/AudioNodeOutput.h"
 #include "modules/webaudio/BiquadFilterNode.h"
 #include "modules/webaudio/ChannelMergerNode.h"
 #include "modules/webaudio/ChannelSplitterNode.h"
 #include "modules/webaudio/ConvolverNode.h"
 #include "modules/webaudio/DefaultAudioDestinationNode.h"
 #include "modules/webaudio/DelayNode.h"
 #include "modules/webaudio/DynamicsCompressorNode.h"
 #include "modules/webaudio/GainNode.h"
 #include "modules/webaudio/MediaElementAudioSourceNode.h"
 #include "modules/webaudio/MediaStreamAudioDestinationNode.h"
 #include "modules/webaudio/MediaStreamAudioSourceNode.h"
 #include "modules/webaudio/OfflineAudioCompletionEvent.h"
 #include "modules/webaudio/OfflineAudioContext.h"
 #include "modules/webaudio/OfflineAudioDestinationNode.h"
 #include "modules/webaudio/OscillatorNode.h"
 #include "modules/webaudio/PannerNode.h"
 #include "modules/webaudio/PeriodicWave.h"
 #include "modules/webaudio/ScriptProcessorNode.h"
 #include "modules/webaudio/StereoPannerNode.h"
 #include "modules/webaudio/WaveShaperNode.h"
 #include "platform/ThreadSafeFunctional.h"
 #include "public/platform/Platform.h"
 #include "wtf/text/WTFString.h"
 
-#if DEBUG_AUDIONODE_REFERENCES
-#include <stdio.h>
-#endif
-
 namespace blink {
 
-// Don't allow more than this number of simultaneous AudioContexts talking to hardware.
-const unsigned MaxHardwareContexts = 6;
-unsigned AudioContext::s_hardwareContextCount = 0;
-unsigned AudioContext::s_contextId = 0;
-
-AudioContext* AudioContext::create(Document& document, ExceptionState& exceptionState)
+AbstractAudioContext* AbstractAudioContext::create(Document& document, ExceptionState& exceptionState)
 {
-    ASSERT(isMainThread());
-    if (s_hardwareContextCount >= MaxHardwareContexts) {
-        exceptionState.throwDOMException(
-            NotSupportedError,
-            ExceptionMessages::indexExceedsMaximumBound(
-                "number of hardware contexts",
-                s_hardwareContextCount,
-                MaxHardwareContexts));
-        return nullptr;
-    }
-
-    AudioContext* audioContext = new AudioContext(&document);
-    audioContext->suspendIfNeeded();
-    return audioContext;
+    return AudioContext::create(document, exceptionState);
 }
 
+// FIXME(dominicc): Devolve these constructors to AudioContext
+// and OfflineAudioContext respectively.
+
 // Constructor for rendering to the audio hardware.
-AudioContext::AudioContext(Document* document)
+AbstractAudioContext::AbstractAudioContext(Document* document)
     : ActiveDOMObject(document)
     , m_isStopScheduled(false)
     , m_isCleared(false)
     , m_isInitialized(false)
     , m_destinationNode(nullptr)
     , m_isResolvingResumePromises(false)
     , m_connectionCount(0)
     , m_didInitializeContextGraphMutex(false)
     , m_deferredTaskHandler(DeferredTaskHandler::create())
-    , m_isOfflineContext(false)
     , m_contextState(Suspended)
 {
     m_didInitializeContextGraphMutex = true;
     m_destinationNode = DefaultAudioDestinationNode::create(this);
 
     initialize();
 }
 
 // Constructor for offline (non-realtime) rendering.
-AudioContext::AudioContext(Document* document, unsigned numberOfChannels, size_t numberOfFrames, float sampleRate)
+AbstractAudioContext::AbstractAudioContext(Document* document, unsigned numberOfChannels, size_t numberOfFrames, float sampleRate)
     : ActiveDOMObject(document)
     , m_isStopScheduled(false)
     , m_isCleared(false)
     , m_isInitialized(false)
     , m_destinationNode(nullptr)
     , m_isResolvingResumePromises(false)
     , m_connectionCount(0)
     , m_didInitializeContextGraphMutex(false)
     , m_deferredTaskHandler(DeferredTaskHandler::create())
-    , m_isOfflineContext(true)
     , m_contextState(Suspended)
 {
     m_didInitializeContextGraphMutex = true;
     // Create a new destination for offline rendering.
     m_renderTarget = AudioBuffer::create(numberOfChannels, numberOfFrames, sampleRate);
     if (m_renderTarget.get())
         m_destinationNode = OfflineAudioDestinationNode::create(this, m_renderTarget.get());
 
     initialize();
 }
 
-AudioContext::~AudioContext()
+AbstractAudioContext::~AbstractAudioContext()
 {
-#if DEBUG_AUDIONODE_REFERENCES
-    fprintf(stderr, "%p: AudioContext::~AudioContext(): %u\n", this, m_contextId);
-#endif
     deferredTaskHandler().contextWillBeDestroyed();
     // AudioNodes keep a reference to their context, so there should be no way to be in the destructor if there are still AudioNodes around.
     ASSERT(!m_isInitialized);
     ASSERT(!m_activeSourceNodes.size());
     ASSERT(!m_finishedSourceHandlers.size());
     ASSERT(!m_isResolvingResumePromises);
     ASSERT(!m_resumeResolvers.size());
 }
 
-void AudioContext::initialize()
+void AbstractAudioContext::initialize()
 {
     if (isInitialized())
         return;
 
     FFTFrame::initialize();
     m_listener = AudioListener::create();
 
     if (m_destinationNode.get()) {
         m_destinationNode->handler().initialize();
-
-        if (!isOfflineContext()) {
-            // This starts the audio thread. The destination node's provideInput() method will now be called repeatedly to render audio.
-            // Each time provideInput() is called, a portion of the audio stream is rendered. Let's call this time period a "render quantum".
-            // NOTE: for now default AudioContext does not need an explicit startRendering() call from JavaScript.
-            // We may want to consider requiring it for symmetry with OfflineAudioContext.
-            startRendering();
-            ++s_hardwareContextCount;
-        }
-
-        m_contextId = s_contextId++;
         m_isInitialized = true;
-#if DEBUG_AUDIONODE_REFERENCES
-        fprintf(stderr, "%p: AudioContext::AudioContext(): %u #%u\n",
-            this, m_contextId, AudioContext::s_hardwareContextCount);
-#endif
     }
 }
 
-void AudioContext::clear()
+void AbstractAudioContext::clear()
 {
     m_destinationNode.clear();
     // The audio rendering thread is dead.  Nobody will schedule AudioHandler
     // deletion.  Let's do it ourselves.
     deferredTaskHandler().clearHandlersToBeDeleted();
     m_isCleared = true;
 }
 
-void AudioContext::uninitialize()
+void AbstractAudioContext::uninitialize()
 {
     ASSERT(isMainThread());
 
     if (!isInitialized())
         return;
 
     m_isInitialized = false;
 
     // This stops the audio thread and all audio rendering.
     if (m_destinationNode)
         m_destinationNode->handler().uninitialize();
 
-    if (!isOfflineContext()) {
-        ASSERT(s_hardwareContextCount);
-        --s_hardwareContextCount;
-    }
-
     // Get rid of the sources which may still be playing.
     releaseActiveSourceNodes();
 
     // Reject any pending resolvers before we go away.
     rejectPendingResolvers();
-
-    // For an offline audio context, the completion event will set the state to closed.  For an
-    // online context, we need to do it here.  We only want to set the closed state once.
-    if (!isOfflineContext())
-        setContextState(Closed);
-
-    // Resolve the promise now, if any
-    if (m_closeResolver)
-        m_closeResolver->resolve();
+    didClose();
 
     ASSERT(m_listener);
     m_listener->waitForHRTFDatabaseLoaderThreadCompletion();
 
     clear();
 }
 
-void AudioContext::stop()
+void AbstractAudioContext::stop()
 {
     // Usually ExecutionContext calls stop twice.
     if (m_isStopScheduled)
         return;
     m_isStopScheduled = true;
 
     // Don't call uninitialize() immediately here because the ExecutionContext is in the middle
     // of dealing with all of its ActiveDOMObjects at this point. uninitialize() can de-reference other
     // ActiveDOMObjects so let's schedule uninitialize() to be called later.
     // FIXME: see if there's a more direct way to handle this issue.
-    Platform::current()->mainThread()->postTask(FROM_HERE, bind(&AudioContext::uninitialize, this));
+    Platform::current()->mainThread()->postTask(FROM_HERE, bind(&AbstractAudioContext::uninitialize, this));
 }
 
-bool AudioContext::hasPendingActivity() const
+bool AbstractAudioContext::hasPendingActivity() const
 {
     // There's no pending activity if the audio context has been cleared.
     return !m_isCleared;
 }
 
-void AudioContext::throwExceptionForClosedState(ExceptionState& exceptionState)
+void AbstractAudioContext::throwExceptionForClosedState(ExceptionState& exceptionState)
 {
     exceptionState.throwDOMException(InvalidStateError, "AudioContext has been closed.");
 }
 
-AudioBuffer* AudioContext::createBuffer(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate, ExceptionState& exceptionState)
+AudioBuffer* AbstractAudioContext::createBuffer(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate, ExceptionState& exceptionState)
 {
     // It's ok to call createBuffer, even if the context is closed because the AudioBuffer doesn't
     // really "belong" to any particular context.
 
     return AudioBuffer::create(numberOfChannels, numberOfFrames, sampleRate, exceptionState);
 }
 
-void AudioContext::decodeAudioData(DOMArrayBuffer* audioData, AudioBufferCallback* successCallback, AudioBufferCallback* errorCallback, ExceptionState& exceptionState)
+void AbstractAudioContext::decodeAudioData(DOMArrayBuffer* audioData, AudioBufferCallback* successCallback, AudioBufferCallback* errorCallback, ExceptionState& exceptionState)
 {
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return;
     }
 
     if (!audioData) {
         exceptionState.throwDOMException(
             SyntaxError,
             "invalid ArrayBuffer for audioData.");
         return;
     }
     m_audioDecoder.decodeAsync(audioData, sampleRate(), successCallback, errorCallback);
 }
 
-AudioBufferSourceNode* AudioContext::createBufferSource(ExceptionState& exceptionState)
+AudioBufferSourceNode* AbstractAudioContext::createBufferSource(ExceptionState& exceptionState)
 {
     ASSERT(isMainThread());
 
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     AudioBufferSourceNode* node = AudioBufferSourceNode::create(*this, sampleRate());
 
     // Do not add a reference to this source node now. The reference will be added when start() is
     // called.
 
     return node;
 }
 
-MediaElementAudioSourceNode* AudioContext::createMediaElementSource(HTMLMediaElement* mediaElement, ExceptionState& exceptionState)
+MediaElementAudioSourceNode* AbstractAudioContext::createMediaElementSource(HTMLMediaElement* mediaElement, ExceptionState& exceptionState)
 {
     ASSERT(isMainThread());
 
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     if (!mediaElement) {
         exceptionState.throwDOMException(
@@ skipping 11 matching lines @@
     }
 
     MediaElementAudioSourceNode* node = MediaElementAudioSourceNode::create(*this, *mediaElement);
 
     mediaElement->setAudioSourceNode(node);
 
     notifySourceNodeStartedProcessing(node); // context keeps reference until node is disconnected
     return node;
 }
 
-MediaStreamAudioSourceNode* AudioContext::createMediaStreamSource(MediaStream* mediaStream, ExceptionState& exceptionState)
+MediaStreamAudioSourceNode* AbstractAudioContext::createMediaStreamSource(MediaStream* mediaStream, ExceptionState& exceptionState)
 {
     ASSERT(isMainThread());
 
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     if (!mediaStream) {
         exceptionState.throwDOMException(
@@ skipping 15 matching lines @@
     OwnPtr<AudioSourceProvider> provider = audioTrack->createWebAudioSource();
     MediaStreamAudioSourceNode* node = MediaStreamAudioSourceNode::create(*this, *mediaStream, audioTrack, provider.release());
 
     // FIXME: Only stereo streams are supported right now. We should be able to accept multi-channel streams.
     node->setFormat(2, sampleRate());
 
     notifySourceNodeStartedProcessing(node); // context keeps reference until node is disconnected
     return node;
 }
 
-MediaStreamAudioDestinationNode* AudioContext::createMediaStreamDestination(ExceptionState& exceptionState)
+MediaStreamAudioDestinationNode* AbstractAudioContext::createMediaStreamDestination(ExceptionState& exceptionState)
 {
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     // Set number of output channels to stereo by default.
     return MediaStreamAudioDestinationNode::create(*this, 2);
 }
 
-ScriptProcessorNode* AudioContext::createScriptProcessor(ExceptionState& exceptionState)
+ScriptProcessorNode* AbstractAudioContext::createScriptProcessor(ExceptionState& exceptionState)
 {
     // Set number of input/output channels to stereo by default.
     return createScriptProcessor(0, 2, 2, exceptionState);
 }
 
-ScriptProcessorNode* AudioContext::createScriptProcessor(size_t bufferSize, ExceptionState& exceptionState)
+ScriptProcessorNode* AbstractAudioContext::createScriptProcessor(size_t bufferSize, ExceptionState& exceptionState)
 {
     // Set number of input/output channels to stereo by default.
     return createScriptProcessor(bufferSize, 2, 2, exceptionState);
 }
 
-ScriptProcessorNode* AudioContext::createScriptProcessor(size_t bufferSize, size_t numberOfInputChannels, ExceptionState& exceptionState)
+ScriptProcessorNode* AbstractAudioContext::createScriptProcessor(size_t bufferSize, size_t numberOfInputChannels, ExceptionState& exceptionState)
 {
     // Set number of output channels to stereo by default.
     return createScriptProcessor(bufferSize, numberOfInputChannels, 2, exceptionState);
 }
 
-ScriptProcessorNode* AudioContext::createScriptProcessor(size_t bufferSize, size_t numberOfInputChannels, size_t numberOfOutputChannels, ExceptionState& exceptionState)
+ScriptProcessorNode* AbstractAudioContext::createScriptProcessor(size_t bufferSize, size_t numberOfInputChannels, size_t numberOfOutputChannels, ExceptionState& exceptionState)
 {
     ASSERT(isMainThread());
 
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     ScriptProcessorNode* node = ScriptProcessorNode::create(*this, sampleRate(), bufferSize, numberOfInputChannels, numberOfOutputChannels);
 
     if (!node) {
         if (!numberOfInputChannels && !numberOfOutputChannels) {
             exceptionState.throwDOMException(
                 IndexSizeError,
                 "number of input channels and output channels cannot both be zero.");
-        } else if (numberOfInputChannels > AudioContext::maxNumberOfChannels()) {
+        } else if (numberOfInputChannels > AbstractAudioContext::maxNumberOfChannels()) {
             exceptionState.throwDOMException(
                 IndexSizeError,
                 "number of input channels (" + String::number(numberOfInputChannels)
                 + ") exceeds maximum ("
-                + String::number(AudioContext::maxNumberOfChannels()) + ").");
-        } else if (numberOfOutputChannels > AudioContext::maxNumberOfChannels()) {
+                + String::number(AbstractAudioContext::maxNumberOfChannels()) + ").");
+        } else if (numberOfOutputChannels > AbstractAudioContext::maxNumberOfChannels()) {
             exceptionState.throwDOMException(
                 IndexSizeError,
                 "number of output channels (" + String::number(numberOfInputChannels)
                 + ") exceeds maximum ("
-                + String::number(AudioContext::maxNumberOfChannels()) + ").");
+                + String::number(AbstractAudioContext::maxNumberOfChannels()) + ").");
         } else {
             exceptionState.throwDOMException(
                 IndexSizeError,
                 "buffer size (" + String::number(bufferSize)
                 + ") must be a power of two between 256 and 16384.");
         }
         return nullptr;
     }
 
     notifySourceNodeStartedProcessing(node); // context keeps reference until we stop making javascript rendering callbacks
     return node;
 }
 
-StereoPannerNode* AudioContext::createStereoPanner(ExceptionState& exceptionState)
+StereoPannerNode* AbstractAudioContext::createStereoPanner(ExceptionState& exceptionState)
 {
     ASSERT(isMainThread());
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     return StereoPannerNode::create(*this, sampleRate());
 }
 
-BiquadFilterNode* AudioContext::createBiquadFilter(ExceptionState& exceptionState)
+BiquadFilterNode* AbstractAudioContext::createBiquadFilter(ExceptionState& exceptionState)
 {
     ASSERT(isMainThread());
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     return BiquadFilterNode::create(*this, sampleRate());
 }
 
-WaveShaperNode* AudioContext::createWaveShaper(ExceptionState& exceptionState)
+WaveShaperNode* AbstractAudioContext::createWaveShaper(ExceptionState& exceptionState)
 {
     ASSERT(isMainThread());
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     return WaveShaperNode::create(*this);
 }
 
-PannerNode* AudioContext::createPanner(ExceptionState& exceptionState)
+PannerNode* AbstractAudioContext::createPanner(ExceptionState& exceptionState)
 {
     ASSERT(isMainThread());
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     return PannerNode::create(*this, sampleRate());
 }
 
-ConvolverNode* AudioContext::createConvolver(ExceptionState& exceptionState)
+ConvolverNode* AbstractAudioContext::createConvolver(ExceptionState& exceptionState)
 {
     ASSERT(isMainThread());
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     return ConvolverNode::create(*this, sampleRate());
 }
 
-DynamicsCompressorNode* AudioContext::createDynamicsCompressor(ExceptionState& exceptionState)
+DynamicsCompressorNode* AbstractAudioContext::createDynamicsCompressor(ExceptionState& exceptionState)
 {
     ASSERT(isMainThread());
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     return DynamicsCompressorNode::create(*this, sampleRate());
 }
 
-AnalyserNode* AudioContext::createAnalyser(ExceptionState& exceptionState)
+AnalyserNode* AbstractAudioContext::createAnalyser(ExceptionState& exceptionState)
 {
     ASSERT(isMainThread());
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     return AnalyserNode::create(*this, sampleRate());
 }
 
-GainNode* AudioContext::createGain(ExceptionState& exceptionState)
+GainNode* AbstractAudioContext::createGain(ExceptionState& exceptionState)
 {
     ASSERT(isMainThread());
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     return GainNode::create(*this, sampleRate());
 }
 
-DelayNode* AudioContext::createDelay(ExceptionState& exceptionState)
+DelayNode* AbstractAudioContext::createDelay(ExceptionState& exceptionState)
 {
     const double defaultMaxDelayTime = 1;
     return createDelay(defaultMaxDelayTime, exceptionState);
 }
 
-DelayNode* AudioContext::createDelay(double maxDelayTime, ExceptionState& exceptionState)
+DelayNode* AbstractAudioContext::createDelay(double maxDelayTime, ExceptionState& exceptionState)
 {
     ASSERT(isMainThread());
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     return DelayNode::create(*this, sampleRate(), maxDelayTime, exceptionState);
 }
 
-ChannelSplitterNode* AudioContext::createChannelSplitter(ExceptionState& exceptionState)
+ChannelSplitterNode* AbstractAudioContext::createChannelSplitter(ExceptionState& exceptionState)
 {
     const unsigned ChannelSplitterDefaultNumberOfOutputs = 6;
     return createChannelSplitter(ChannelSplitterDefaultNumberOfOutputs, exceptionState);
 }
 
-ChannelSplitterNode* AudioContext::createChannelSplitter(size_t numberOfOutputs, ExceptionState& exceptionState)
+ChannelSplitterNode* AbstractAudioContext::createChannelSplitter(size_t numberOfOutputs, ExceptionState& exceptionState)
 {
     ASSERT(isMainThread());
 
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     ChannelSplitterNode* node = ChannelSplitterNode::create(*this, sampleRate(), numberOfOutputs);
 
     if (!node) {
         exceptionState.throwDOMException(
             IndexSizeError,
             "number of outputs (" + String::number(numberOfOutputs)
             + ") must be between 1 and "
-            + String::number(AudioContext::maxNumberOfChannels()) + ".");
+            + String::number(AbstractAudioContext::maxNumberOfChannels()) + ".");
         return nullptr;
     }
 
     return node;
 }
 
-ChannelMergerNode* AudioContext::createChannelMerger(ExceptionState& exceptionState)
+ChannelMergerNode* AbstractAudioContext::createChannelMerger(ExceptionState& exceptionState)
 {
     const unsigned ChannelMergerDefaultNumberOfInputs = 6;
     return createChannelMerger(ChannelMergerDefaultNumberOfInputs, exceptionState);
 }
 
-ChannelMergerNode* AudioContext::createChannelMerger(size_t numberOfInputs, ExceptionState& exceptionState)
+ChannelMergerNode* AbstractAudioContext::createChannelMerger(size_t numberOfInputs, ExceptionState& exceptionState)
 {
     ASSERT(isMainThread());
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     ChannelMergerNode* node = ChannelMergerNode::create(*this, sampleRate(), numberOfInputs);
 
     if (!node) {
         exceptionState.throwDOMException(
             IndexSizeError,
             ExceptionMessages::indexOutsideRange<size_t>(
                 "number of inputs",
                 numberOfInputs,
                 1,
                 ExceptionMessages::InclusiveBound,
-                AudioContext::maxNumberOfChannels(),
+                AbstractAudioContext::maxNumberOfChannels(),
                 ExceptionMessages::InclusiveBound));
         return nullptr;
     }
 
     return node;
 }
 
-OscillatorNode* AudioContext::createOscillator(ExceptionState& exceptionState)
+OscillatorNode* AbstractAudioContext::createOscillator(ExceptionState& exceptionState)
 {
     ASSERT(isMainThread());
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     OscillatorNode* node = OscillatorNode::create(*this, sampleRate());
 
     // Do not add a reference to this source node now. The reference will be added when start() is
     // called.
 
     return node;
 }
 
-PeriodicWave* AudioContext::createPeriodicWave(DOMFloat32Array* real, DOMFloat32Array* imag, ExceptionState& exceptionState)
+PeriodicWave* AbstractAudioContext::createPeriodicWave(DOMFloat32Array* real, DOMFloat32Array* imag, ExceptionState& exceptionState)
 {
     ASSERT(isMainThread());
 
     if (isContextClosed()) {
         throwExceptionForClosedState(exceptionState);
         return nullptr;
     }
 
     if (!real) {
         exceptionState.throwDOMException(
@@ skipping 40 matching lines @@
             IndexSizeError,
             "length of real array (" + String::number(real->length())
             + ") and length of imaginary array (" +  String::number(imag->length())
             + ") must match.");
         return nullptr;
     }
 
     return PeriodicWave::create(sampleRate(), real, imag);
 }
 
-String AudioContext::state() const
+String AbstractAudioContext::state() const
 {
     // These strings had better match the strings for AudioContextState in AudioContext.idl.
     switch (m_contextState) {
     case Suspended:
         return "suspended";
     case Running:
         return "running";
     case Closed:
         return "closed";
     }
     ASSERT_NOT_REACHED();
     return "";
 }
 
-void AudioContext::setContextState(AudioContextState newState)
+void AbstractAudioContext::setContextState(AudioContextState newState)
 {
     ASSERT(isMainThread());
 
     // Validate the transitions.  The valid transitions are Suspended->Running, Running->Suspended,
     // and anything->Closed.
     switch (newState) {
     case Suspended:
         ASSERT(m_contextState == Running);
         break;
     case Running:
         ASSERT(m_contextState == Suspended);
         break;
     case Closed:
         ASSERT(m_contextState != Closed);
         break;
     }
 
     if (newState == m_contextState) {
         // ASSERTs above failed; just return.
         return;
     }
 
     m_contextState = newState;
 
     // Notify context that state changed
     if (executionContext())
-        executionContext()->postTask(FROM_HERE, createSameThreadTask(&AudioContext::notifyStateChange, this));
+        executionContext()->postTask(FROM_HERE, createSameThreadTask(&AbstractAudioContext::notifyStateChange, this));
 }
 
-void AudioContext::notifyStateChange()
+void AbstractAudioContext::notifyStateChange()
 {
     dispatchEvent(Event::create(EventTypeNames::statechange));
 }
 
-ScriptPromise AudioContext::suspendContext(ScriptState* scriptState)
-{
-    ASSERT(isMainThread());
-    AutoLocker locker(this);
-
-    if (isOfflineContext()) {
-        return ScriptPromise::rejectWithDOMException(
-            scriptState,
-            DOMException::create(
-                InvalidAccessError,
-                "cannot suspend an OfflineAudioContext"));
-    }
-
-    RefPtrWillBeRawPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(scriptState);
-    ScriptPromise promise = resolver->promise();
-
-    if (m_contextState == Closed) {
-        resolver->reject(
-            DOMException::create(InvalidStateError, "Cannot suspend a context that has been closed"));
-    } else {
-        // Stop rendering now.
-        if (m_destinationNode)
-            stopRendering();
-
-        // Since we don't have any way of knowing when the hardware actually stops, we'll just
-        // resolve the promise now.
-        resolver->resolve();
-    }
-
-    return promise;
-}
-
-ScriptPromise AudioContext::resumeContext(ScriptState* scriptState)
-{
-    ASSERT(isMainThread());
-    AutoLocker locker(this);
-
-    if (isOfflineContext()) {
-        return ScriptPromise::rejectWithDOMException(
-            scriptState,
-            DOMException::create(
-                InvalidAccessError,
-                "cannot resume an OfflineAudioContext"));
-    }
-
-    if (isContextClosed()) {
-        return ScriptPromise::rejectWithDOMException(
-            scriptState,
-            DOMException::create(
-                InvalidAccessError,
-                "cannot resume a closed AudioContext"));
-    }
-
-    RefPtrWillBeRawPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(scriptState);
-    ScriptPromise promise = resolver->promise();
-
-    // Restart the destination node to pull on the audio graph.
-    if (m_destinationNode)
-        startRendering();
-
-    // Save the resolver which will get resolved when the destination node starts pulling on the
-    // graph again.
-    m_resumeResolvers.append(resolver);
-
-    return promise;
-}
-
-void AudioContext::notifySourceNodeFinishedProcessing(AudioHandler* handler)
+void AbstractAudioContext::notifySourceNodeFinishedProcessing(AudioHandler* handler)
 {
     ASSERT(isAudioThread());
     m_finishedSourceHandlers.append(handler);
 }
 
-void AudioContext::releaseFinishedSourceNodes()
+void AbstractAudioContext::releaseFinishedSourceNodes()
 {
     ASSERT(isGraphOwner());
     ASSERT(isAudioThread());
     for (AudioHandler* handler : m_finishedSourceHandlers) {
         for (unsigned i = 0; i < m_activeSourceNodes.size(); ++i) {
             if (handler == &m_activeSourceNodes[i]->handler()) {
                 handler->breakConnection();
                 m_activeSourceNodes.remove(i);
                 break;
             }
         }
     }
 
     m_finishedSourceHandlers.clear();
 }
 
-void AudioContext::notifySourceNodeStartedProcessing(AudioNode* node)
+void AbstractAudioContext::notifySourceNodeStartedProcessing(AudioNode* node)
 {
     ASSERT(isMainThread());
     AutoLocker locker(this);
 
     m_activeSourceNodes.append(node);
     node->handler().makeConnection();
 }
 
-void AudioContext::releaseActiveSourceNodes()
+void AbstractAudioContext::releaseActiveSourceNodes()
 {
     ASSERT(isMainThread());
     for (auto& sourceNode : m_activeSourceNodes)
         sourceNode->handler().breakConnection();
 
     m_activeSourceNodes.clear();
 }
 
-void AudioContext::handleStoppableSourceNodes()
+void AbstractAudioContext::handleStoppableSourceNodes()
 {
     ASSERT(isGraphOwner());
 
     // Find AudioBufferSourceNodes to see if we can stop playing them.
     for (AudioNode* node : m_activeSourceNodes) {
         if (node->handler().nodeType() == AudioHandler::NodeTypeAudioBufferSource) {
             AudioBufferSourceNode* sourceNode = static_cast<AudioBufferSourceNode*>(node);
             sourceNode->audioBufferSourceHandler().handleStoppableSourceNode();
         }
     }
 }
 
-void AudioContext::handlePreRenderTasks()
+void AbstractAudioContext::handlePreRenderTasks()
 {
     ASSERT(isAudioThread());
 
     // At the beginning of every render quantum, try to update the internal rendering graph state (from main thread changes).
     // It's OK if the tryLock() fails, we'll just take slightly longer to pick up the changes.
     if (tryLock()) {
         deferredTaskHandler().handleDeferredTasks();
 
         resolvePromisesForResume();
 
         // Check to see if source nodes can be stopped because the end time has passed.
         handleStoppableSourceNodes();
 
         unlock();
     }
 }
 
-void AudioContext::handlePostRenderTasks()
+void AbstractAudioContext::handlePostRenderTasks()
 {
     ASSERT(isAudioThread());
 
     // Must use a tryLock() here too.  Don't worry, the lock will very rarely be contended and this method is called frequently.
     // The worst that can happen is that there will be some nodes which will take slightly longer than usual to be deleted or removed
     // from the render graph (in which case they'll render silence).
     if (tryLock()) {
         // Take care of AudioNode tasks where the tryLock() failed previously.
         deferredTaskHandler().breakConnections();
 
         // Dynamically clean up nodes which are no longer needed.
         releaseFinishedSourceNodes();
 
         deferredTaskHandler().handleDeferredTasks();
         deferredTaskHandler().requestToDeleteHandlersOnMainThread();
 
         unlock();
     }
 }
 
-void AudioContext::resolvePromisesForResumeOnMainThread()
+void AbstractAudioContext::resolvePromisesForResumeOnMainThread()
 {
     ASSERT(isMainThread());
     AutoLocker locker(this);
 
     for (auto& resolver : m_resumeResolvers) {
         if (m_contextState == Closed) {
             resolver->reject(
                 DOMException::create(InvalidStateError, "Cannot resume a context that has been closed"));
         } else {
             resolver->resolve();
         }
     }
 
     m_resumeResolvers.clear();
     m_isResolvingResumePromises = false;
 }
 
-void AudioContext::resolvePromisesForResume()
+void AbstractAudioContext::resolvePromisesForResume()
 {
-    // This runs inside the AudioContext's lock when handling pre-render tasks.
+    // This runs inside the AbstractAudioContext's lock when handling pre-render tasks.
     ASSERT(isAudioThread());
     ASSERT(isGraphOwner());
 
     // Resolve any pending promises created by resume(). Only do this if we haven't already started
     // resolving these promises. This gets called very often and it takes some time to resolve the
     // promises in the main thread.
     if (!m_isResolvingResumePromises && m_resumeResolvers.size() > 0) {
         m_isResolvingResumePromises = true;
-        Platform::current()->mainThread()->postTask(FROM_HERE, threadSafeBind(&AudioContext::resolvePromisesForResumeOnMainThread, this));
+        Platform::current()->mainThread()->postTask(FROM_HERE, threadSafeBind(&AbstractAudioContext::resolvePromisesForResumeOnMainThread, this));
     }
 }
 
-void AudioContext::rejectPendingResolvers()
+void AbstractAudioContext::rejectPendingResolvers()
 {
     ASSERT(isMainThread());
 
     // Audio context is closing down so reject any resume promises that are still pending.
 
     for (auto& resolver : m_resumeResolvers) {
         resolver->reject(DOMException::create(InvalidStateError, "Audio context is going away"));
     }
     m_resumeResolvers.clear();
     m_isResolvingResumePromises = false;
 }
 
-const AtomicString& AudioContext::interfaceName() const
+const AtomicString& AbstractAudioContext::interfaceName() const
 {
     return EventTargetNames::AudioContext;
 }
 
-ExecutionContext* AudioContext::executionContext() const
+ExecutionContext* AbstractAudioContext::executionContext() const
 {
     return m_isStopScheduled ? 0 : ActiveDOMObject::executionContext();
 }
 
-void AudioContext::startRendering()
+void AbstractAudioContext::startRendering()
 {
     // This is called for both online and offline contexts.
     ASSERT(isMainThread());
     ASSERT(m_destinationNode);
 
     if (m_contextState == Suspended) {
         destination()->audioDestinationHandler().startRendering();
         setContextState(Running);
     }
 }
 
-void AudioContext::stopRendering()
-{
-    ASSERT(isMainThread());
-    ASSERT(m_destinationNode);
-    ASSERT(!isOfflineContext());
-
-    if (m_contextState == Running) {
-        destination()->audioDestinationHandler().stopRendering();
-        setContextState(Suspended);
-        deferredTaskHandler().clearHandlersToBeDeleted();
-    }
-}
-
-void AudioContext::fireCompletionEvent()
+void AbstractAudioContext::fireCompletionEvent()
 {
     ASSERT(isMainThread());
     if (!isMainThread())
         return;
 
     AudioBuffer* renderedBuffer = m_renderTarget.get();
 
     // For an offline context, we set the state to closed here so that the oncomplete handler sees
     // that the context has been closed.
     setContextState(Closed);
 
     ASSERT(renderedBuffer);
     if (!renderedBuffer)
         return;
 
     // Avoid firing the event if the document has already gone away.
     if (executionContext()) {
         // Call the offline rendering completion event listener and resolve the promise too.
         dispatchEvent(OfflineAudioCompletionEvent::create(renderedBuffer));
         m_offlineResolver->resolve(renderedBuffer);
     }
 }
 
-DEFINE_TRACE(AudioContext)
+DEFINE_TRACE(AbstractAudioContext)
 {
-    visitor->trace(m_closeResolver);
     visitor->trace(m_offlineResolver);
     visitor->trace(m_renderTarget);
     visitor->trace(m_destinationNode);
     visitor->trace(m_listener);
-    // trace() can be called in AudioContext constructor, and
+    // trace() can be called in AbstractAudioContext constructor, and
     // m_contextGraphMutex might be unavailable.
     if (m_didInitializeContextGraphMutex) {
         AutoLocker lock(this);
         visitor->trace(m_activeSourceNodes);
     } else {
         visitor->trace(m_activeSourceNodes);
     }
     visitor->trace(m_resumeResolvers);
-    RefCountedGarbageCollectedEventTargetWithInlineData<AudioContext>::trace(visitor);
+    RefCountedGarbageCollectedEventTargetWithInlineData<AbstractAudioContext>::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
-SecurityOrigin* AudioContext::securityOrigin() const
+SecurityOrigin* AbstractAudioContext::securityOrigin() const
 {
     if (executionContext())
         return executionContext()->securityOrigin();
 
     return nullptr;
 }
 
-ScriptPromise AudioContext::closeContext(ScriptState* scriptState)
-{
-    if (isOfflineContext()) {
-        return ScriptPromise::rejectWithDOMException(
-            scriptState,
-            DOMException::create(InvalidAccessError, "cannot close an OfflineAudioContext."));
-    }
-
-    if (isContextClosed()) {
-        // We've already closed the context previously, but it hasn't yet been resolved, so just
-        // create a new promise and reject it.
-        return ScriptPromise::rejectWithDOMException(
-            scriptState,
-            DOMException::create(InvalidStateError,
-                "Cannot close a context that is being closed or has already been closed."));
-    }
-
-    m_closeResolver = ScriptPromiseResolver::create(scriptState);
-    ScriptPromise promise = m_closeResolver->promise();
-
-    // Stop the audio context. This will stop the destination node from pulling audio anymore. And
-    // since we have disconnected the destination from the audio graph, and thus has no references,
-    // the destination node can GCed if JS has no references. stop() will also resolve the Promise
-    // created here.
-    stop();
-
-    return promise;
-}
-
 } // namespace blink
 
 #endif // ENABLE(WEB_AUDIO)