gecko-dev/dom/camera/CameraPreviewMediaStream.h

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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_CAMERAPREVIEWMEDIASTREAM_H
#define DOM_CAMERA_CAMERAPREVIEWMEDIASTREAM_H
#include "VideoFrameContainer.h"
#include "MediaStreamGraph.h"
#include "mozilla/Mutex.h"
namespace mozilla {
class FakeMediaStreamGraph : public MediaStreamGraph
{
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(FakeMediaStreamGraph)
public:
FakeMediaStreamGraph()
: MediaStreamGraph(16000)
{
}
virtual void
DispatchToMainThreadAfterStreamStateUpdate(already_AddRefed<nsIRunnable> aRunnable) override;
protected:
~FakeMediaStreamGraph()
{}
};
/**
* This is a stream for camera preview.
*
* XXX It is a temporary fix of SourceMediaStream.
* A camera preview requests no delay and no buffering stream,
* but the SourceMediaStream does not support it.
*/
class CameraPreviewMediaStream : public MediaStream
{
typedef mozilla::layers::Image Image;
public:
explicit CameraPreviewMediaStream(DOMMediaStream* aWrapper);
virtual void AddAudioOutput(void* aKey) override;
virtual void SetAudioOutputVolume(void* aKey, float aVolume) override;
virtual void RemoveAudioOutput(void* aKey) override;
virtual void AddVideoOutput(VideoFrameContainer* aContainer) override;
virtual void RemoveVideoOutput(VideoFrameContainer* aContainer) override;
virtual void Suspend() override {}
virtual void Resume() override {}
virtual void AddListener(MediaStreamListener* aListener) override;
virtual void RemoveListener(MediaStreamListener* aListener) override;
virtual void Destroy() override;
void OnPreviewStateChange(bool aActive);
void Invalidate();
// Call these on any thread.
void SetCurrentFrame(const gfx::IntSize& aIntrinsicSize, Image* aImage);
void ClearCurrentFrame();
void RateLimit(bool aLimit);
protected:
// mMutex protects all the class' fields.
// This class is not registered to MediaStreamGraph.
// It needs to protect all the fields.
Mutex mMutex;
int32_t mInvalidatePending;
uint32_t mDiscardedFrames;
bool mRateLimit;
bool mTrackCreated;
RefPtr<FakeMediaStreamGraph> mFakeMediaStreamGraph;
};
} // namespace mozilla
#endif // DOM_CAMERA_CAMERAPREVIEWMEDIASTREAM_H