/usr/include/firefox-esr-52/mozilla/dom/CanvasCaptureMediaStream.h is in firefox-esr-dev 52.8.1esr-1~deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_dom_CanvasCaptureMediaStream_h_
#define mozilla_dom_CanvasCaptureMediaStream_h_
#include "DOMMediaStream.h"
#include "mozilla/dom/HTMLCanvasElement.h"
#include "StreamTracks.h"
class nsIPrincipal;
namespace mozilla {
class DOMMediaStream;
class MediaStreamListener;
class SourceMediaStream;
namespace layers {
class Image;
} // namespace layers
namespace dom {
class CanvasCaptureMediaStream;
class HTMLCanvasElement;
class OutputStreamFrameListener;
/*
* The CanvasCaptureMediaStream is a MediaStream subclass that provides a video
* track containing frames from a canvas. See an architectural overview below.
*
* ----------------------------------------------------------------------------
* === Main Thread === __________________________
* | |
* | CanvasCaptureMediaStream |
* |__________________________|
* |
* | RequestFrame()
* v
* ________________________
* ________ FrameCaptureRequested? | |
* | | ------------------------> | OutputStreamDriver |
* | Canvas | SetFrameCapture() | (FrameCaptureListener) |
* |________| ------------------------> |________________________|
* |
* | SetImage()
* v
* ___________________
* | StreamListener |
* ---------------------------------------| (All image access |----------------
* === MediaStreamGraph Thread === | Mutex Guarded) |
* |___________________|
* ^ |
* NotifyPull() | | AppendToTrack()
* | v
* ___________________________
* | |
* | MSG / SourceMediaStream |
* |___________________________|
* ----------------------------------------------------------------------------
*/
/*
* Base class for drivers of the output stream.
* It is up to each sub class to implement the NewFrame() callback of
* FrameCaptureListener.
*/
class OutputStreamDriver : public FrameCaptureListener
{
public:
OutputStreamDriver(SourceMediaStream* aSourceStream,
const TrackID& aTrackId,
const PrincipalHandle& aPrincipalHandle);
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(OutputStreamDriver);
/*
* Sub classes can SetImage() to update the image being appended to the
* output stream. It will be appended on the next NotifyPull from MSG.
*/
void SetImage(const RefPtr<layers::Image>& aImage);
/*
* Makes sure any internal resources this driver is holding that may create
* reference cycles are released.
*/
virtual void Forget() {}
protected:
virtual ~OutputStreamDriver();
class StreamListener;
private:
RefPtr<SourceMediaStream> mSourceStream;
RefPtr<StreamListener> mStreamListener;
};
class CanvasCaptureMediaStream : public DOMMediaStream
{
public:
CanvasCaptureMediaStream(nsPIDOMWindowInner* aWindow, HTMLCanvasElement* aCanvas);
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(CanvasCaptureMediaStream, DOMMediaStream)
nsresult Init(const dom::Optional<double>& aFPS, const TrackID& aTrackId,
nsIPrincipal* aPrincipal);
JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
// WebIDL
HTMLCanvasElement* Canvas() const { return mCanvas; }
void RequestFrame();
dom::FrameCaptureListener* FrameCaptureListener();
/**
* Stops capturing for this stream at mCanvas.
*/
void StopCapture();
/**
* Create a CanvasCaptureMediaStream whose underlying stream is a SourceMediaStream.
*/
static already_AddRefed<CanvasCaptureMediaStream>
CreateSourceStream(nsPIDOMWindowInner* aWindow,
HTMLCanvasElement* aCanvas);
protected:
~CanvasCaptureMediaStream();
private:
RefPtr<HTMLCanvasElement> mCanvas;
RefPtr<OutputStreamDriver> mOutputStreamDriver;
};
} // namespace dom
} // namespace mozilla
#endif /* mozilla_dom_CanvasCaptureMediaStream_h_ */
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