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109 lines
2.9 KiB
C++
109 lines
2.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_CanvasCaptureMediaStream_h_
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#define mozilla_dom_CanvasCaptureMediaStream_h_
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namespace mozilla {
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class DOMMediaStream;
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class MediaStreamListener;
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class SourceMediaStream;
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namespace layers {
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class Image;
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}
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namespace dom {
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class CanvasCaptureMediaStream;
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class HTMLCanvasElement;
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class OutputStreamDriver
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{
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public:
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OutputStreamDriver(CanvasCaptureMediaStream* aDOMStream,
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const TrackID& aTrackId);
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(OutputStreamDriver);
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nsresult Start();
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virtual void ForgetDOMStream();
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virtual void RequestFrame() { }
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CanvasCaptureMediaStream* DOMStream() const { return mDOMStream; }
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protected:
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virtual ~OutputStreamDriver();
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class StreamListener;
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/*
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* Appends mImage to video track for the desired duration.
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*/
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void AppendToTrack(StreamTime aDuration);
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void NotifyPull(StreamTime aDesiredTime);
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/*
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* Sub classes can SetImage() to update the image being appended to the
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* output stream. It will be appended on the next NotifyPull from MSG.
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*/
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void SetImage(layers::Image* aImage);
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/*
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* Called in main thread stable state to initialize sub classes.
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*/
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virtual void StartInternal() = 0;
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private:
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// This is a raw pointer to avoid a reference cycle between OutputStreamDriver
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// and CanvasCaptureMediaStream. ForgetDOMStream() will be called by
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// ~CanvasCaptureMediaStream() to make sure we don't do anything illegal.
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CanvasCaptureMediaStream* mDOMStream;
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nsRefPtr<SourceMediaStream> mSourceStream;
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bool mStarted;
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nsRefPtr<StreamListener> mStreamListener;
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const TrackID mTrackId;
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// The below members are protected by mMutex.
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Mutex mMutex;
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nsRefPtr<layers::Image> mImage;
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};
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class CanvasCaptureMediaStream: public DOMMediaStream
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{
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public:
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explicit CanvasCaptureMediaStream(HTMLCanvasElement* aCanvas);
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NS_DECL_ISUPPORTS_INHERITED
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(CanvasCaptureMediaStream, DOMMediaStream)
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nsresult Init(const dom::Optional<double>& aFPS, const TrackID& aTrackId);
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virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
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// WebIDL
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HTMLCanvasElement* Canvas() const { return mCanvas; }
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void RequestFrame();
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/**
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* Create a CanvasCaptureMediaStream whose underlying stream is a SourceMediaStream.
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*/
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static already_AddRefed<CanvasCaptureMediaStream>
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CreateSourceStream(nsIDOMWindow* aWindow,
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HTMLCanvasElement* aCanvas);
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protected:
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~CanvasCaptureMediaStream();
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private:
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nsRefPtr<HTMLCanvasElement> mCanvas;
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nsRefPtr<OutputStreamDriver> mOutputStreamDriver;
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};
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} // namespace dom
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} // namespace mozilla
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#endif /* mozilla_dom_CanvasCaptureMediaStream_h_ */
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