gecko-dev/dom/camera/CameraControlImpl.h

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/* 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_CAMERACONTROLIMPL_H
#define DOM_CAMERA_CAMERACONTROLIMPL_H
#include "nsTArray.h"
#include "nsWeakPtr.h"
#include "mozilla/Attributes.h"
#include "mozilla/ReentrantMonitor.h"
#include "mozilla/Mutex.h"
#include "nsIFile.h"
#include "nsProxyRelease.h"
#include "ICameraControl.h"
#include "CameraCommon.h"
#include "DeviceStorage.h"
#include "DeviceStorageFileDescriptor.h"
#include "CameraControlListener.h"
namespace mozilla {
namespace dom {
class BlobImpl;
} // namespace dom
namespace layers {
class Image;
} // namespace layers
class CameraControlImpl : public ICameraControl
{
public:
explicit CameraControlImpl();
virtual void AddListener(CameraControlListener* aListener) override;
virtual void RemoveListener(CameraControlListener* aListener) override;
// See ICameraControl.h for these methods' return values.
virtual nsresult Start(const Configuration* aConfig = nullptr) override;
virtual nsresult Stop() override;
virtual nsresult SetConfiguration(const Configuration& aConfig) override;
virtual nsresult StartPreview() override;
virtual nsresult StopPreview() override;
virtual nsresult AutoFocus() override;
virtual nsresult StartFaceDetection() override;
virtual nsresult StopFaceDetection() override;
virtual nsresult TakePicture() override;
virtual nsresult StartRecording(DeviceStorageFileDescriptor* aFileDescriptor,
const StartRecordingOptions* aOptions) override;
virtual nsresult StopRecording() override;
virtual nsresult PauseRecording() override;
virtual nsresult ResumeRecording() override;
virtual nsresult ResumeContinuousFocus() override;
// Event handlers called directly from outside this class.
void OnShutter();
void OnUserError(CameraControlListener::UserContext aContext, nsresult aError);
void OnSystemError(CameraControlListener::SystemContext aContext, nsresult aError);
void OnAutoFocusMoving(bool aIsMoving);
protected:
// Event handlers.
void OnAutoFocusComplete(bool aAutoFocusSucceeded);
void OnFacesDetected(const nsTArray<Face>& aFaces);
void OnTakePictureComplete(const uint8_t* aData, uint32_t aLength, const nsAString& aMimeType);
void OnPoster(dom::BlobImpl* aBlobImpl);
void OnRateLimitPreview(bool aLimit);
bool OnNewPreviewFrame(layers::Image* aImage, uint32_t aWidth, uint32_t aHeight);
void OnRecorderStateChange(CameraControlListener::RecorderState aState,
int32_t aStatus = -1, int32_t aTrackNumber = -1);
void OnPreviewStateChange(CameraControlListener::PreviewState aState);
void OnHardwareStateChange(CameraControlListener::HardwareState aState,
nsresult aReason);
void OnConfigurationChange();
// When we create a new CameraThread, we keep a static reference to it so
// that multiple CameraControl instances can find and reuse it; but we
// don't want that reference to keep the thread object around unnecessarily,
// so we make it a weak reference. The strong dynamic references will keep
// the thread object alive as needed.
static StaticRefPtr<nsIThread> sCameraThread;
nsCOMPtr<nsIThread> mCameraThread;
virtual ~CameraControlImpl();
virtual void BeginBatchParameterSet() override { }
virtual void EndBatchParameterSet() override { }
// Manage camera event listeners.
void AddListenerImpl(already_AddRefed<CameraControlListener> aListener);
void RemoveListenerImpl(CameraControlListener* aListener);
nsTArray<RefPtr<CameraControlListener> > mListeners;
mutable Mutex mListenerLock;
class ControlMessage;
class ListenerMessage;
nsresult Dispatch(ControlMessage* aMessage);
// Asynchronous method implementations, invoked on the Camera Thread.
//
// Return values:
// - NS_OK on success;
// - NS_ERROR_INVALID_ARG if one or more arguments is invalid;
// - NS_ERROR_NOT_INITIALIZED if the underlying hardware is not initialized,
// failed to initialize (in the case of StartImpl()), or has been stopped;
// for StartRecordingImpl(), this indicates that no recorder has been
// configured (either by calling StartImpl() or SetConfigurationImpl());
// - NS_ERROR_ALREADY_INITIALIZED if the underlying hardware is already
// initialized;
// - NS_ERROR_NOT_IMPLEMENTED if the method is not implemented;
// - NS_ERROR_FAILURE on general failures.
virtual nsresult StartImpl(const Configuration* aConfig = nullptr) = 0;
virtual nsresult StopImpl() = 0;
virtual nsresult SetConfigurationImpl(const Configuration& aConfig) = 0;
virtual nsresult StartPreviewImpl() = 0;
virtual nsresult StopPreviewImpl() = 0;
virtual nsresult AutoFocusImpl() = 0;
virtual nsresult StartFaceDetectionImpl() = 0;
virtual nsresult StopFaceDetectionImpl() = 0;
virtual nsresult TakePictureImpl() = 0;
virtual nsresult StartRecordingImpl(DeviceStorageFileDescriptor* aFileDescriptor,
const StartRecordingOptions* aOptions) = 0;
virtual nsresult StopRecordingImpl() = 0;
virtual nsresult PauseRecordingImpl() = 0;
virtual nsresult ResumeRecordingImpl() = 0;
virtual nsresult ResumeContinuousFocusImpl() = 0;
virtual nsresult PushParametersImpl() = 0;
virtual nsresult PullParametersImpl() = 0;
void OnShutterInternal();
void OnClosedInternal();
CameraControlListener::CameraListenerConfiguration mCurrentConfiguration;
CameraControlListener::PreviewState mPreviewState;
CameraControlListener::HardwareState mHardwareState;
nsresult mHardwareStateChangeReason;
private:
CameraControlImpl(const CameraControlImpl&) = delete;
CameraControlImpl& operator=(const CameraControlImpl&) = delete;
};
} // namespace mozilla
#endif // DOM_CAMERA_CAMERACONTROLIMPL_H