зеркало из https://github.com/mozilla/gecko-dev.git
100 строки
3.1 KiB
C++
100 строки
3.1 KiB
C++
/* 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 DOM_CAMERA_DOMCAMERAPREVIEW_H
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#define DOM_CAMERA_DOMCAMERAPREVIEW_H
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#include "nsCycleCollectionParticipant.h"
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#include "MediaStreamGraph.h"
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#include "StreamBuffer.h"
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#include "ICameraControl.h"
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#include "DOMMediaStream.h"
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#include "CameraPreviewMediaStream.h"
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#include "CameraCommon.h"
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class nsGlobalWindow;
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namespace mozilla {
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typedef void (*FrameBuilder)(mozilla::layers::Image* aImage, void* aBuffer, uint32_t aWidth, uint32_t aHeight);
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/**
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* DOMCameraPreview is only exposed to the DOM as an nsDOMMediaStream,
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* which is a cycle-collection participant already, and we don't
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* add any traceable fields here, so we don't need to declare any
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* more cycle-collection goop.
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*/
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class DOMCameraPreview : public DOMMediaStream
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{
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protected:
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enum { TRACK_VIDEO = 1 };
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public:
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DOMCameraPreview(nsGlobalWindow* aWindow, ICameraControl* aCameraControl,
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uint32_t aWidth, uint32_t aHeight, uint32_t aFramesPerSecond = 30);
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bool ReceiveFrame(void* aBuffer, ImageFormat aFormat, mozilla::FrameBuilder aBuilder);
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bool HaveEnoughBuffered();
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void Start(); // called by the MediaStreamListener to start preview
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void Started(); // called by the CameraControl when preview is started
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void StopPreview(); // called by the MediaStreamListener to stop preview
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void Stopped(bool aForced = false);
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// called by the CameraControl when preview is stopped
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void Error(); // something went wrong, NS_RELEASE needed
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void SetStateStarted();
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void SetStateStopped();
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protected:
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virtual ~DOMCameraPreview();
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enum {
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STOPPED,
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STARTING,
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STARTED,
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STOPPING
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};
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uint32_t mState;
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// Helper function, used in conjunction with the macro below, to make
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// it easy to track state changes, which must happen only on the main
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// thread.
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void
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SetState(uint32_t aNewState, const char* aFileOrFunc, int aLine)
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{
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#ifdef PR_LOGGING
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const char* states[] = { "stopped", "starting", "started", "stopping" };
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MOZ_ASSERT(mState < sizeof(states) / sizeof(states[0]));
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MOZ_ASSERT(aNewState < sizeof(states) / sizeof(states[0]));
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DOM_CAMERA_LOGI("SetState: (this=%p) '%s' --> '%s' : %s:%d\n", this, states[mState], states[aNewState], aFileOrFunc, aLine);
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#endif
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NS_ASSERTION(NS_IsMainThread(), "Preview state set OFF OF main thread!");
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mState = aNewState;
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}
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uint32_t mWidth;
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uint32_t mHeight;
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uint32_t mFramesPerSecond;
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CameraPreviewMediaStream* mInput;
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nsRefPtr<mozilla::layers::ImageContainer> mImageContainer;
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VideoSegment mVideoSegment;
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uint32_t mFrameCount;
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nsRefPtr<ICameraControl> mCameraControl;
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// Raw pointer; AddListener() keeps the reference for us
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MediaStreamListener* mListener;
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private:
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DOMCameraPreview(const DOMCameraPreview&) MOZ_DELETE;
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DOMCameraPreview& operator=(const DOMCameraPreview&) MOZ_DELETE;
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};
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} // namespace mozilla
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#define DOM_CAMERA_SETSTATE(newState) SetState((newState), __func__, __LINE__)
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#endif // DOM_CAMERA_DOMCAMERAPREVIEW_H
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