Index: third_party/WebKit/Source/modules/webaudio/OfflineAudioContext.cpp |
diff --git a/third_party/WebKit/Source/modules/webaudio/OfflineAudioContext.cpp b/third_party/WebKit/Source/modules/webaudio/OfflineAudioContext.cpp |
index b95e4da61988f5074ebc95145d4682c63b41c476..492ab00a60ee62bf34ed8358caf8abcdafaaa60a 100644 |
--- a/third_party/WebKit/Source/modules/webaudio/OfflineAudioContext.cpp |
+++ b/third_party/WebKit/Source/modules/webaudio/OfflineAudioContext.cpp |
@@ -32,6 +32,10 @@ |
#include "core/dom/Document.h" |
#include "core/dom/ExceptionCode.h" |
#include "core/dom/ExecutionContext.h" |
+#include "modules/webaudio/DeferredTaskHandler.h" |
+#include "modules/webaudio/OfflineAudioCompletionEvent.h" |
+#include "modules/webaudio/OfflineAudioDestinationNode.h" |
+ |
#include "platform/audio/AudioUtilities.h" |
namespace blink { |
@@ -76,7 +80,7 @@ OfflineAudioContext* OfflineAudioContext::create(ExecutionContext* context, unsi |
return nullptr; |
} |
- OfflineAudioContext* audioContext = new OfflineAudioContext(document, numberOfChannels, numberOfFrames, sampleRate); |
+ OfflineAudioContext* audioContext = new OfflineAudioContext(document, numberOfChannels, numberOfFrames, sampleRate, exceptionState); |
if (!audioContext->destination()) { |
exceptionState.throwDOMException( |
@@ -91,19 +95,49 @@ OfflineAudioContext* OfflineAudioContext::create(ExecutionContext* context, unsi |
return audioContext; |
} |
-OfflineAudioContext::OfflineAudioContext(Document* document, unsigned numberOfChannels, size_t numberOfFrames, float sampleRate) |
+OfflineAudioContext::OfflineAudioContext(Document* document, unsigned numberOfChannels, size_t numberOfFrames, float sampleRate, ExceptionState& exceptionState) |
: AbstractAudioContext(document, numberOfChannels, numberOfFrames, sampleRate) |
+ , m_isRenderingStarted(false) |
+ , m_totalRenderFrames(numberOfFrames) |
{ |
+ // Create a new destination for offline rendering. |
+ m_renderTarget = AudioBuffer::create(numberOfChannels, numberOfFrames, sampleRate); |
+ |
+ // Throw an exception if the render target is not ready. |
+ if (m_renderTarget) { |
+ m_destinationNode = OfflineAudioDestinationNode::create(this, m_renderTarget.get()); |
+ } else { |
+ exceptionState.throwRangeError(ExceptionMessages::failedToConstruct( |
+ "OfflineAudioContext", |
+ "failed to create OfflineAudioContext(" + |
+ String::number(numberOfChannels) + ", " + |
+ String::number(numberOfFrames) + ", " + |
+ String::number(sampleRate) + ")")); |
+ } |
+ |
+ initialize(); |
} |
OfflineAudioContext::~OfflineAudioContext() |
{ |
} |
+DEFINE_TRACE(OfflineAudioContext) |
+{ |
+ visitor->trace(m_renderTarget); |
+ visitor->trace(m_completeResolver); |
+ visitor->trace(m_scheduledSuspends); |
+ AbstractAudioContext::trace(visitor); |
+} |
+ |
ScriptPromise OfflineAudioContext::startOfflineRendering(ScriptState* scriptState) |
{ |
+ ASSERT(isMainThread()); |
+ |
// Calling close() on an OfflineAudioContext is not supported/allowed, |
// but it might well have been stopped by its execution context. |
+ // |
+ // See: crbug.com/435867 |
if (isContextClosed()) { |
return ScriptPromise::rejectWithDOMException( |
scriptState, |
@@ -112,8 +146,17 @@ ScriptPromise OfflineAudioContext::startOfflineRendering(ScriptState* scriptStat |
"cannot call startRendering on an OfflineAudioContext in a stopped state.")); |
} |
- if (m_offlineResolver) { |
- // Can't call startRendering more than once. Return a rejected promise now. |
+ // If the context is not in the suspended state (i.e. running), reject the promise. |
+ if (contextState() != AudioContextState::Suspended) { |
+ return ScriptPromise::rejectWithDOMException( |
+ scriptState, |
+ DOMException::create( |
+ InvalidStateError, |
+ "cannot startRendering when an OfflineAudioContext is " + state())); |
+ } |
+ |
+ // Can't call startRendering more than once. Return a rejected promise now. |
+ if (m_isRenderingStarted) { |
return ScriptPromise::rejectWithDOMException( |
scriptState, |
DOMException::create( |
@@ -121,34 +164,235 @@ ScriptPromise OfflineAudioContext::startOfflineRendering(ScriptState* scriptStat |
"cannot call startRendering more than once")); |
} |
- m_offlineResolver = ScriptPromiseResolver::create(scriptState); |
- startRendering(); |
- return m_offlineResolver->promise(); |
+ ASSERT(!m_isRenderingStarted); |
+ |
+ m_completeResolver = ScriptPromiseResolver::create(scriptState); |
+ |
+ // Start rendering and return the promise. |
+ m_isRenderingStarted = true; |
+ setContextState(Running); |
+ destinationHandler().startRendering(); |
+ |
+ return m_completeResolver->promise(); |
} |
ScriptPromise OfflineAudioContext::closeContext(ScriptState* scriptState) |
{ |
return ScriptPromise::rejectWithDOMException( |
scriptState, |
- DOMException::create(InvalidAccessError, "cannot close an OfflineAudioContext.")); |
+ DOMException::create( |
+ InvalidAccessError, |
+ "cannot close an OfflineAudioContext.")); |
} |
ScriptPromise OfflineAudioContext::suspendContext(ScriptState* scriptState) |
{ |
- return ScriptPromise::rejectWithDOMException( |
- scriptState, |
- DOMException::create( |
- InvalidAccessError, |
- "cannot suspend an OfflineAudioContext")); |
+ // This CANNOT be called on OfflineAudioContext; this is only to implement |
+ // the pure virtual interface from AbstractAudioContext. |
+ RELEASE_ASSERT_NOT_REACHED(); |
+ |
+ return ScriptPromise(); |
+} |
+ |
+ScriptPromise OfflineAudioContext::suspendContext(ScriptState* scriptState, double when) |
+{ |
+ ASSERT(isMainThread()); |
+ |
+ ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState); |
+ ScriptPromise promise = resolver->promise(); |
+ |
+ // The render thread does not exist; reject the promise. |
+ if (!destinationHandler().offlineRenderThread()) { |
+ resolver->reject(DOMException::create(InvalidStateError, |
+ "the rendering is already finished")); |
+ return promise; |
+ } |
+ |
+ // The specified suspend time is negative; reject the promise. |
+ if (when < 0) { |
+ resolver->reject(DOMException::create(InvalidStateError, |
+ "negative suspend time (" + String::number(when) + ") is not allowed")); |
+ return promise; |
+ } |
+ |
+ // Quantize (to the lower boundary) the suspend time by the render quantum. |
+ size_t frame = when * sampleRate(); |
+ frame -= frame % destinationHandler().renderQuantumFrames(); |
+ |
+ // The suspend time should be earlier than the total render frame. If the |
+ // requested suspension time is equal to the total render frame, the promise |
+ // will be rejected. |
+ if (m_totalRenderFrames <= frame) { |
+ resolver->reject(DOMException::create(InvalidStateError, |
+ "cannot schedule a suspend at frame " + String::number(frame) + |
+ " (" + String::number(when) + " seconds) " + |
+ "because it is greater than or equal to the total render duration of " + |
+ String::number(m_totalRenderFrames) + " frames")); |
+ return promise; |
+ } |
+ |
+ // The specified suspend time is in the past; reject the promise. |
+ if (frame < currentSampleFrame()) { |
+ resolver->reject(DOMException::create(InvalidStateError, |
+ "cannot schedule a suspend at frame " + |
+ String::number(frame) + " (" + String::number(when) + |
+ " seconds) because it is earlier than the current frame of " + |
+ String::number(currentSampleFrame()) + " (" + |
+ String::number(currentTime()) + " seconds)")); |
+ return promise; |
+ } |
+ |
+ // Wait until the suspend map is available for the insertion. Here we should |
+ // use AutoLocker because it locks the graph from the main thread. |
+ AutoLocker locker(this); |
+ |
+ // If there is a duplicate suspension at the same quantized frame, |
+ // reject the promise. |
+ if (m_scheduledSuspends.contains(frame)) { |
+ resolver->reject(DOMException::create(InvalidStateError, |
+ "cannot schedule more than one suspend at frame " + |
+ String::number(frame) + " (" + |
+ String::number(when) + " seconds)")); |
+ return promise; |
+ } |
+ |
+ m_scheduledSuspends.add(frame, resolver); |
+ |
+ return promise; |
} |
ScriptPromise OfflineAudioContext::resumeContext(ScriptState* scriptState) |
{ |
- return ScriptPromise::rejectWithDOMException( |
- scriptState, |
- DOMException::create( |
- InvalidAccessError, |
- "cannot resume an OfflineAudioContext")); |
+ ASSERT(isMainThread()); |
+ |
+ ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState); |
+ ScriptPromise promise = resolver->promise(); |
+ |
+ // If the rendering has not started, reject the promise. |
+ if (!m_isRenderingStarted) { |
+ resolver->reject(DOMException::create(InvalidStateError, |
+ "cannot resume an offline context that has not started")); |
+ return promise; |
+ } |
+ |
+ // If the context is in a closed state, reject the promise. |
+ if (contextState() == AudioContextState::Closed) { |
+ resolver->reject(DOMException::create(InvalidStateError, |
+ "cannot resume a closed offline context")); |
+ return promise; |
+ } |
+ |
+ // If the context is already running, resolve the promise without altering |
+ // the current state or starting the rendering loop. |
+ if (contextState() == AudioContextState::Running) { |
+ resolver->resolve(); |
+ return promise; |
+ } |
+ |
+ ASSERT(contextState() == AudioContextState::Suspended); |
+ |
+ // If the context is suspended, resume rendering by setting the state to |
+ // "Running". and calling startRendering(). Note that resuming is possible |
+ // only after the rendering started. |
+ setContextState(Running); |
+ destinationHandler().startRendering(); |
+ |
+ // Resolve the promise immediately. |
+ resolver->resolve(); |
+ |
+ return promise; |
+} |
+ |
+void OfflineAudioContext::fireCompletionEvent() |
+{ |
+ ASSERT(isMainThread()); |
+ |
+ // We set the state to closed here so that the oncomplete event handler sees |
+ // that the context has been closed. |
+ setContextState(Closed); |
+ |
+ AudioBuffer* renderedBuffer = renderTarget(); |
+ |
+ 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_completeResolver->resolve(renderedBuffer); |
+ } else { |
+ // The resolver should be rejected when the execution context is gone. |
+ m_completeResolver->reject(DOMException::create(InvalidStateError, |
+ "the execution context does not exist")); |
+ } |
+} |
+ |
+bool OfflineAudioContext::handlePreOfflineRenderTasks() |
+{ |
+ ASSERT(isAudioThread()); |
+ |
+ // OfflineGraphAutoLocker here locks the audio graph for this scope. Note |
+ // that this locker does not use tryLock() inside because the timing of |
+ // suspension MUST NOT be delayed. |
+ OfflineGraphAutoLocker locker(this); |
+ |
+ deferredTaskHandler().handleDeferredTasks(); |
+ handleStoppableSourceNodes(); |
+ |
+ return shouldSuspend(); |
+} |
+ |
+void OfflineAudioContext::handlePostOfflineRenderTasks() |
+{ |
+ ASSERT(isAudioThread()); |
+ |
+ // OfflineGraphAutoLocker here locks the audio graph for the same reason |
+ // above in |handlePreOfflineRenderTasks|. |
+ OfflineGraphAutoLocker locker(this); |
+ |
+ deferredTaskHandler().breakConnections(); |
+ releaseFinishedSourceNodes(); |
+ deferredTaskHandler().handleDeferredTasks(); |
+ deferredTaskHandler().requestToDeleteHandlersOnMainThread(); |
+} |
+ |
+ |
+OfflineAudioDestinationHandler& OfflineAudioContext::destinationHandler() |
+{ |
+ return static_cast<OfflineAudioDestinationHandler&>(destination()->audioDestinationHandler()); |
+} |
+ |
+void OfflineAudioContext::resolveSuspendOnMainThread(size_t frame) |
+{ |
+ ASSERT(isMainThread()); |
+ |
+ // Suspend the context first. This will fire onstatechange event. |
+ setContextState(Suspended); |
+ |
+ // Wait until the suspend map is available for the removal. |
+ AutoLocker locker(this); |
+ |
+ ASSERT(m_scheduledSuspends.contains(frame)); |
+ |
+ SuspendMap::iterator it = m_scheduledSuspends.find(frame); |
+ it->value->resolve(); |
+ |
+ m_scheduledSuspends.remove(it); |
+} |
+ |
+bool OfflineAudioContext::shouldSuspend() |
+{ |
+ ASSERT(isAudioThread()); |
+ |
+ // Note that the GraphLock is required before this check. Since this needs |
+ // to run on the audio thread, OfflineGraphAutoLocker must be used. |
+ if (m_scheduledSuspends.contains(currentSampleFrame())) |
+ return true; |
+ |
+ return false; |
} |
} // namespace blink |