Split "Online" and "Offline" AudioContext processing

Source/modules/webaudio/AbstractAudioContext.h

Index: Source/modules/webaudio/AbstractAudioContext.h
diff --git a/Source/modules/webaudio/AudioContext.h b/Source/modules/webaudio/AbstractAudioContext.h
similarity index 90%
copy from Source/modules/webaudio/AudioContext.h
copy to Source/modules/webaudio/AbstractAudioContext.h
index 00ad293d1871fc1652a6a21484e9476e32073193..9c691fbe83906283427b9200f1a43c82ed618ef9 100644
--- a/Source/modules/webaudio/AudioContext.h
+++ b/Source/modules/webaudio/AbstractAudioContext.h
@@ -22,8 +22,8 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef AudioContext_h
-#define AudioContext_h
+#ifndef AbstractAudioContext_h
+#define AbstractAudioContext_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
@@ -74,12 +74,12 @@ class SecurityOrigin;
 class StereoPannerNode;
 class WaveShaperNode;
 
-// AudioContext is the cornerstone of the web audio API and all AudioNodes are created from it.
+// AbstractAudioContext 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 MODULES_EXPORT AudioContext : public RefCountedGarbageCollectedEventTargetWithInlineData<AudioContext>, public ActiveDOMObject {
-    REFCOUNTED_GARBAGE_COLLECTED_EVENT_TARGET(AudioContext);
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(AudioContext);
+class MODULES_EXPORT AbstractAudioContext : public RefCountedGarbageCollectedEventTargetWithInlineData<AbstractAudioContext>, public ActiveDOMObject {
+    REFCOUNTED_GARBAGE_COLLECTED_EVENT_TARGET(AbstractAudioContext);
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(AbstractAudioContext);
     DEFINE_WRAPPERTYPEINFO();
 public:
     // The state of an audio context.  On creation, the state is Suspended. The state is Running if
@@ -93,14 +93,13 @@ public:
     };
 
     // Create an AudioContext for rendering to the audio hardware.
-    static AudioContext* create(Document&, ExceptionState&);
+    static AbstractAudioContext* create(Document&, ExceptionState&);
 
-    ~AudioContext() override;
+    ~AbstractAudioContext() override;
 
     DECLARE_VIRTUAL_TRACE();
 
     bool isInitialized() const { return m_isInitialized; }
-    bool isOfflineContext() { return m_isOfflineContext; }
 
     // Document notification
     void stop() final;
@@ -130,6 +129,8 @@ public:
 
     AudioListener* listener() { return m_listener.get(); }
 
+    virtual bool hasRealtimeConstraint() = 0;
+
     // The AudioNode create methods are called on the main thread (from JavaScript).
     AudioBufferSourceNode* createBufferSource(ExceptionState&);
     MediaElementAudioSourceNode* createMediaElementSource(HTMLMediaElement*, ExceptionState&);
@@ -157,11 +158,11 @@ public:
     PeriodicWave* createPeriodicWave(DOMFloat32Array* real, DOMFloat32Array* imag, ExceptionState&);
 
     // Close
-    ScriptPromise closeContext(ScriptState*);
+    virtual ScriptPromise closeContext(ScriptState*) = 0;
 
     // Suspend/Resume
-    ScriptPromise suspendContext(ScriptState*);
-    ScriptPromise resumeContext(ScriptState*);
+    virtual ScriptPromise suspendContext(ScriptState*) = 0;
+    virtual ScriptPromise resumeContext(ScriptState*) = 0;
 
     // When a source node has started processing and needs to be protected,
     // this method tells the context to protect the node.
@@ -230,22 +231,28 @@ public:
     //  - closeContext() has been called, even if the audio HW has not yet been
     //    stopped.  It will be stopped eventually.
     //  - it has been stopped (or is stopping) by its execution context.
-    bool isContextClosed() const { return m_closeResolver || m_isStopScheduled || m_isCleared; }
-
-    static unsigned s_hardwareContextCount;
-    static unsigned s_contextId;
+    virtual bool isContextClosed() const { return m_isStopScheduled || m_isCleared; }
 
     // Get the security origin for this audio context.
     SecurityOrigin* securityOrigin() const;
 
 protected:
-    explicit AudioContext(Document*);
-    AudioContext(Document*, unsigned numberOfChannels, size_t numberOfFrames, float sampleRate);
+    explicit AbstractAudioContext(Document*);
+    AbstractAudioContext(Document*, unsigned numberOfChannels, size_t numberOfFrames, float sampleRate);
+
+    void setContextState(AudioContextState);
+    virtual void didClose() {}
+    void uninitialize();
 
     RefPtrWillBeMember<ScriptPromiseResolver> m_offlineResolver;
+
+    // FIXME(dominicc): Move m_resumeResolvers to AudioContext, because only
+    // it creates these Promises.
+    // Vector of promises created by resume(). It takes time to handle them, so we collect all of
+    // the promises here until they can be resolved or rejected.
+    WillBeHeapVector<RefPtrWillBeMember<ScriptPromiseResolver>> m_resumeResolvers;
 private:
     void initialize();
-    void uninitialize();
 
     // ExecutionContext calls stop twice.
     // We'd like to schedule only one stop action for them.
@@ -278,16 +285,12 @@ private:
     // this.
     HeapVector<Member<AudioNode>> m_activeSourceNodes;
 
-    // Stop rendering the audio graph.
-    void stopRendering();
-
+    // FIXME(dominicc): Move these to AudioContext because only
+    // it creates these Promises.
     // Handle Promises for resume() and suspend()
     void resolvePromisesForResume();
     void resolvePromisesForResumeOnMainThread();
 
-    // Vector of promises created by resume(). It takes time to handle them, so we collect all of
-    // the promises here until they can be resolved or rejected.
-    WillBeHeapVector<RefPtrWillBeMember<ScriptPromiseResolver>> m_resumeResolvers;
     void rejectPendingResolvers();
 
     // True if we're in the process of resolving promises for resume().  Resolving can take some
@@ -303,17 +306,11 @@ private:
 
     Member<AudioBuffer> m_renderTarget;
 
-    bool m_isOfflineContext;
-
-    // The state of the AudioContext.
+    // The state of the AbstractAudioContext.
     AudioContextState m_contextState;
-    void setContextState(AudioContextState);
 
     AsyncAudioDecoder m_audioDecoder;
 
-    // The Promise that is returned by close();
-    RefPtrWillBeMember<ScriptPromiseResolver> m_closeResolver;
-
     // Tries to handle AudioBufferSourceNodes that were started but became disconnected or was never
     // connected. Because these never get pulled anymore, they will stay around forever. So if we
     // can, try to stop them so they can be collected.
@@ -322,10 +319,8 @@ private:
     // This is considering 32 is large enough for multiple channels audio.
     // It is somewhat arbitrary and could be increased if necessary.
     enum { MaxNumberOfChannels = 32 };
-
-    unsigned m_contextId;
 };
 
 } // namespace blink
 
-#endif // AudioContext_h
+#endif // AbstractAudioContext_h