gecko/dom/camera/DOMCameraPreview.h

82 lines
2.3 KiB
C++

/* 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 DOM_CAMERA_DOMCAMERAPREVIEW_H
#define DOM_CAMERA_DOMCAMERAPREVIEW_H
#include "nsCycleCollectionParticipant.h"
#include "MediaStreamGraph.h"
#include "StreamBuffer.h"
#include "ICameraControl.h"
#include "nsDOMMediaStream.h"
#include "CameraCommon.h"
using namespace mozilla;
using namespace mozilla::layers;
namespace mozilla {
typedef void (*FrameBuilder)(Image* aImage, void* aBuffer, uint32_t aWidth, uint32_t aHeight);
/**
* DOMCameraPreview is only exposed to the DOM as an nsDOMMediaStream,
* which is a cycle-collection participant already.
*/
class DOMCameraPreview : public nsDOMMediaStream
{
protected:
enum { TRACK_VIDEO = 1 };
public:
DOMCameraPreview(ICameraControl* aCameraControl, uint32_t aWidth, uint32_t aHeight, uint32_t aFramesPerSecond = 30);
bool ReceiveFrame(void* aBuffer, ImageFormat aFormat, FrameBuilder aBuilder);
bool HaveEnoughBuffered();
NS_IMETHODIMP
GetCurrentTime(double* aCurrentTime) {
return nsDOMMediaStream::GetCurrentTime(aCurrentTime);
}
void Start(); // called by the MediaStreamListener to start preview
void Started(); // called by the CameraControl when preview is started
void Stop(); // called by the MediaStreamListener to stop preview
void Stopped(bool aForced = false);
// called by the CameraControl when preview is stopped
void Error(); // something went wrong, NS_RELEASE needed
void SetStateStarted();
void SetStateStopped();
protected:
virtual ~DOMCameraPreview();
enum {
STOPPED,
STARTING,
STARTED,
STOPPING
};
uint32_t mState;
uint32_t mWidth;
uint32_t mHeight;
uint32_t mFramesPerSecond;
SourceMediaStream* mInput;
nsRefPtr<ImageContainer> mImageContainer;
VideoSegment mVideoSegment;
uint32_t mFrameCount;
nsRefPtr<ICameraControl> mCameraControl;
// Raw pointer; AddListener() keeps the reference for us
MediaStreamListener* mListener;
private:
DOMCameraPreview(const DOMCameraPreview&) MOZ_DELETE;
DOMCameraPreview& operator=(const DOMCameraPreview&) MOZ_DELETE;
};
} // namespace mozilla
#endif // DOM_CAMERA_DOMCAMERAPREVIEW_H