Index: Source/modules/webaudio/OfflineAudioContext.h |
diff --git a/Source/modules/webaudio/OfflineAudioContext.h b/Source/modules/webaudio/OfflineAudioContext.h |
index 99276e7cbb5e19dc7edf2934b67a726f2eed8d2a..77fe2dc37a4c5aa56dc160c2f66f547d817be450 100644 |
--- a/Source/modules/webaudio/OfflineAudioContext.h |
+++ b/Source/modules/webaudio/OfflineAudioContext.h |
@@ -27,10 +27,18 @@ |
#include "modules/ModulesExport.h" |
#include "modules/webaudio/AudioContext.h" |
+#include "wtf/HashMap.h" |
namespace blink { |
class ExceptionState; |
+class ScheduledSuspendContainer; |
+ |
+// The HashMap with 'zero' key is needed because |currentSampleFrame| can be |
+// zero. Also ScheduledSuspendContainer is a raw pointer (rather than RefPtr) |
+// because it must be guaranteed that the main thread keeps it alive while the |
+// render thread uses it. |
+using SuspendContainerMap = HashMap<size_t, ScheduledSuspendContainer*, DefaultHash<size_t>::Hash, WTF::UnsignedWithZeroKeyHashTraits<size_t>>; |
class MODULES_EXPORT OfflineAudioContext final : public AudioContext { |
DEFINE_WRAPPERTYPEINFO(); |
@@ -39,9 +47,84 @@ public: |
virtual ~OfflineAudioContext(); |
+ DECLARE_VIRTUAL_TRACE(); |
+ |
+ // Fire completion event when the rendering is finished. |
+ void fireCompletionEvent() override; |
+ |
+ // Check all the scheduled suspends if the context should suspend at |
+ // currentTime(). Then post tasks to resolve promises on the main thread |
+ // if necessary. |
+ bool shouldSuspendNow() override; |
+ |
+ // Clear suspensions marked as 'resolved' in the list. |
+ void resolvePendingSuspendPromises() override; |
+ |
+ DEFINE_ATTRIBUTE_EVENT_LISTENER(complete); |
+ |
ScriptPromise startOfflineRendering(ScriptState*); |
+ ScriptPromise suspendOfflineRendering(ScriptState*, double); |
+ ScriptPromise resumeOfflineRendering(ScriptState*); |
+ |
private: |
OfflineAudioContext(Document*, unsigned numberOfChannels, size_t numberOfFrames, float sampleRate); |
+ |
+ // Check a suspend container if it has a duplicate scheduled frame or |
+ // is behind the current frame. If the validation fails, post a task to the |
+ // main thread to reject the promise. |
+ void validateSuspendContainerOnRenderThread(ScheduledSuspendContainer*); |
+ |
+ // Reject a suspend container on the main thread when the validation fails. |
+ void rejectSuspendContainerOnMainThread(ScheduledSuspendContainer*); |
+ |
+ // Resolve a pending suspend container. |
+ void resolveSuspendContainerOnMainThread(ScheduledSuspendContainer*); |
+ |
+ SuspendContainerMap m_scheduledSuspends; |
+ RefPtrWillBeMember<ScriptPromiseResolver> m_completeResolver; |
+ |
+ // This flag is necessary to indicate the rendering has actually started. |
+ // Note that initial state of context is 'Suspended', which is the same |
+ // state when the context is suspended. |
+ bool m_isRenderingStarted; |
+ |
+ // Total render sample length. |
+ size_t m_totalRenderFrames; |
+}; |
+ |
+// A container class for a pair of time information and the suspend promise |
+// resolver. This class does not need to be |ThreadSafeRefCounted| because it |
+// needs to be created and destructed in the same thread. |
+class ScheduledSuspendContainer { |
+public: |
+ static ScheduledSuspendContainer* create(double suspendTime, size_t suspendFrame, PassRefPtrWillBeRawPtr<ScriptPromiseResolver>); |
+ ~ScheduledSuspendContainer(); |
+ |
+ double suspendTime() const { return m_suspendTime; } |
+ size_t suspendFrame() const { return m_suspendFrame; } |
+ |
+ // Set the error message for the reason of rejection on the render thread |
+ // before sending it to the main thread. |
+ void setErrorMessageForRejection(ExceptionCode, const String&); |
+ |
+ // {Resolve, Reject} the promise resolver on the main thread. |
+ void resolvePromise(); |
+ void rejectPromise(); |
+ |
+private: |
+ ScheduledSuspendContainer(double suspendTime, size_t suspendFrame, PassRefPtrWillBeRawPtr<ScriptPromiseResolver>); |
+ |
+ // Actual suspend time before the quantization by render quantum frame. |
+ double m_suspendTime; |
+ |
+ // Suspend sample frame. This is quantized by the render quantum size. |
+ size_t m_suspendFrame; |
+ |
+ // Associated promise resolver. |
+ RefPtrWillBePersistent<ScriptPromiseResolver> m_resolver; |
+ |
+ ExceptionCode m_errorCode; |
+ String m_errorMessage; |
}; |
} // namespace blink |