diff options
Diffstat (limited to 'camera/libcameraservice/CameraService.h')
| -rw-r--r-- | camera/libcameraservice/CameraService.h | 254 |
1 files changed, 109 insertions, 145 deletions
diff --git a/camera/libcameraservice/CameraService.h b/camera/libcameraservice/CameraService.h index bc49b1d..86986ca 100644 --- a/camera/libcameraservice/CameraService.h +++ b/camera/libcameraservice/CameraService.h @@ -21,207 +21,171 @@ #include <camera/ICameraService.h> #include <camera/CameraHardwareInterface.h> -#include <camera/Camera.h> + +/* This needs to be increased if we can have more cameras */ +#define MAX_CAMERAS 2 namespace android { class MemoryHeapBase; class MediaPlayer; -// ---------------------------------------------------------------------------- - -#define LIKELY( exp ) (__builtin_expect( (exp) != 0, true )) -#define UNLIKELY( exp ) (__builtin_expect( (exp) != 0, false )) - -// When enabled, this feature allows you to send an event to the CameraService -// so that you can cause all references to the heap object gWeakHeap, defined -// below, to be printed. You will also need to set DEBUG_REFS=1 and -// DEBUG_REFS_ENABLED_BY_DEFAULT=0 in libutils/RefBase.cpp. You just have to -// set gWeakHeap to the appropriate heap you want to track. - -#define DEBUG_HEAP_LEAKS 0 - -// ---------------------------------------------------------------------------- - -class CameraService : public BnCameraService +class CameraService: public BnCameraService { class Client; - public: - static void instantiate(); + static void instantiate(); + + CameraService(); + virtual ~CameraService(); - // ICameraService interface - virtual sp<ICamera> connect(const sp<ICameraClient>& cameraClient); + virtual int32_t getNumberOfCameras(); + virtual sp<ICamera> connect(const sp<ICameraClient>& cameraClient, int cameraId); + virtual void removeClient(const sp<ICameraClient>& cameraClient); + virtual sp<Client> getClientById(int cameraId); - virtual status_t dump(int fd, const Vector<String16>& args); + virtual status_t dump(int fd, const Vector<String16>& args); + virtual status_t onTransact(uint32_t code, const Parcel& data, + Parcel* reply, uint32_t flags); - void removeClient(const sp<ICameraClient>& cameraClient); + enum sound_kind { + SOUND_SHUTTER = 0, + SOUND_RECORDING = 1, + NUM_SOUNDS + }; - virtual status_t onTransact( - uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags); + void loadSound(); + void playSound(sound_kind kind); + void releaseSound(); private: + Mutex mServiceLock; + wp<Client> mClient[MAX_CAMERAS]; // protected by mServiceLock -// ---------------------------------------------------------------------------- + // atomics to record whether the hardware is allocated to some client. + volatile int32_t mBusy[MAX_CAMERAS]; + void setCameraBusy(int cameraId); + void setCameraFree(int cameraId); - class Client : public BnCamera { + // sounds + Mutex mSoundLock; + sp<MediaPlayer> mSoundPlayer[NUM_SOUNDS]; + int mSoundRef; // reference count (release all MediaPlayer when 0) + class Client : public BnCamera + { public: + // ICamera interface (see ICamera for details) virtual void disconnect(); - - // connect new client with existing camera remote virtual status_t connect(const sp<ICameraClient>& client); - - // prevent other processes from using this ICamera interface virtual status_t lock(); - - // allow other processes to use this ICamera interface virtual status_t unlock(); - - // pass the buffered ISurface to the camera service virtual status_t setPreviewDisplay(const sp<ISurface>& surface); - - // set the preview callback flag to affect how the received frames from - // preview are handled. - virtual void setPreviewCallbackFlag(int callback_flag); - - // start preview mode, must call setPreviewDisplay first + virtual void setPreviewCallbackFlag(int flag); virtual status_t startPreview(); - - // stop preview mode virtual void stopPreview(); - - // get preview state virtual bool previewEnabled(); - - // start recording mode virtual status_t startRecording(); - - // stop recording mode virtual void stopRecording(); - - // get recording state virtual bool recordingEnabled(); - - // release a recording frame virtual void releaseRecordingFrame(const sp<IMemory>& mem); - - // auto focus virtual status_t autoFocus(); - - // cancel auto focus virtual status_t cancelAutoFocus(); - - // take a picture - returns an IMemory (ref-counted mmap) virtual status_t takePicture(); - - // set preview/capture parameters - key/value pairs virtual status_t setParameters(const String8& params); - - // get preview/capture parameters - key/value pairs virtual String8 getParameters() const; - - // send command to camera driver virtual status_t sendCommand(int32_t cmd, int32_t arg1, int32_t arg2); - - // our client... - const sp<ICameraClient>& getCameraClient() const { return mCameraClient; } - private: friend class CameraService; Client(const sp<CameraService>& cameraService, - const sp<ICameraClient>& cameraClient, - pid_t clientPid); - Client(); - virtual ~Client(); - - status_t checkPid(); - - static void notifyCallback(int32_t msgType, int32_t ext1, int32_t ext2, void* user); - static void dataCallback(int32_t msgType, const sp<IMemory>& dataPtr, void* user); - static void dataCallbackTimestamp(nsecs_t timestamp, int32_t msgType, - const sp<IMemory>& dataPtr, void* user); + const sp<ICameraClient>& cameraClient, + int cameraId, + int clientPid); + ~Client(); - static sp<Client> getClientFromCookie(void* user); + // return our camera client + const sp<ICameraClient>& getCameraClient() { return mCameraClient; } - void handlePreviewData(const sp<IMemory>&); - void handleShutter(image_rect_type *image); - void handlePostview(const sp<IMemory>&); - void handleRawPicture(const sp<IMemory>&); - void handleCompressedPicture(const sp<IMemory>&); + // check whether the calling process matches mClientPid. + status_t checkPid() const; + status_t checkPidAndHardware() const; // also check mHardware != 0 - void copyFrameAndPostCopiedFrame(const sp<ICameraClient>& client, - const sp<IMemoryHeap>& heap, size_t offset, size_t size); + // these are internal functions used to set up preview buffers + status_t registerPreviewBuffers(); + status_t setOverlay(); // camera operation mode enum camera_mode { CAMERA_PREVIEW_MODE = 0, // frame automatically released CAMERA_RECORDING_MODE = 1, // frame has to be explicitly released by releaseRecordingFrame() }; + // these are internal functions used for preview/recording status_t startCameraMode(camera_mode mode); status_t startPreviewMode(); status_t startRecordingMode(); - status_t setOverlay(); - status_t registerPreviewBuffers(); + + // these are static callback functions + static void notifyCallback(int32_t msgType, int32_t ext1, int32_t ext2, void* user); + static void dataCallback(int32_t msgType, const sp<IMemory>& dataPtr, void* user); + static void dataCallbackTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr, void* user); + // convert client from cookie + static sp<Client> getClientFromCookie(void* user); + // handlers for messages + void handleShutter(image_rect_type *size); + void handlePreviewData(const sp<IMemory>& mem); + void handlePostview(const sp<IMemory>& mem); + void handleRawPicture(const sp<IMemory>& mem); + void handleCompressedPicture(const sp<IMemory>& mem); + void handleGenericNotify(int32_t msgType, int32_t ext1, int32_t ext2); + void handleGenericData(int32_t msgType, const sp<IMemory>& dataPtr); + void handleGenericDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr); + + void copyFrameAndPostCopiedFrame( + const sp<ICameraClient>& client, + const sp<IMemoryHeap>& heap, + size_t offset, size_t size); + + // these are initialized in the constructor. + sp<CameraService> mCameraService; // immutable after constructor + sp<ICameraClient> mCameraClient; + int mCameraId; // immutable after constructor + pid_t mClientPid; + sp<CameraHardwareInterface> mHardware; // cleared after disconnect() + bool mUseOverlay; // immutable after constructor + sp<OverlayRef> mOverlayRef; + int mOverlayW; + int mOverlayH; + int mPreviewCallbackFlag; + int mOrientation; // Ensures atomicity among the public methods - mutable Mutex mLock; - - // mSurfaceLock synchronizes access to mSurface between - // setPreviewSurface() and postPreviewFrame(). Note that among - // the public methods, all accesses to mSurface are - // syncrhonized by mLock. However, postPreviewFrame() is called - // by the CameraHardwareInterface callback, and needs to - // access mSurface. It cannot hold mLock, however, because - // stopPreview() may be holding that lock while attempting - // to stop preview, and stopPreview itself will block waiting - // for a callback from CameraHardwareInterface. If this - // happens, it will cause a deadlock. - mutable Mutex mSurfaceLock; - mutable Condition mReady; - sp<CameraService> mCameraService; - sp<ISurface> mSurface; - int mPreviewCallbackFlag; - int mOrientation; - - sp<MediaPlayer> mMediaPlayerClick; - sp<MediaPlayer> mMediaPlayerBeep; - - // these are immutable once the object is created, - // they don't need to be protected by a lock - sp<ICameraClient> mCameraClient; - sp<CameraHardwareInterface> mHardware; - pid_t mClientPid; - bool mUseOverlay; - - sp<OverlayRef> mOverlayRef; - int mOverlayW; - int mOverlayH; - - mutable Mutex mPreviewLock; - sp<MemoryHeapBase> mPreviewBuffer; + mutable Mutex mLock; + sp<ISurface> mSurface; + + // If the user want us to return a copy of the preview frame (instead + // of the original one), we allocate mPreviewBuffer and reuse it if possible. + sp<MemoryHeapBase> mPreviewBuffer; + + // We need to avoid the deadlock when the incoming command thread and + // the CameraHardwareInterface callback thread both want to grab mLock. + // An extra flag is used to tell the callback thread that it should stop + // trying to deliver the callback messages if the client is not + // interested in it anymore. For example, if the client is calling + // stopPreview(), the preview frame messages do not need to be delivered + // anymore. + + // This function takes the same parameter as the enableMsgType() and + // disableMsgType() functions in CameraHardwareInterface. + void enableMsgType(int32_t msgType); + void disableMsgType(int32_t msgType); + volatile int32_t mMsgEnabled; + + // This function keeps trying to grab mLock, or give up if the message + // is found to be disabled. It returns true if mLock is grabbed. + bool lockIfMessageWanted(int32_t msgType); }; - -// ---------------------------------------------------------------------------- - - CameraService(); - virtual ~CameraService(); - - // We use a count for number of clients (shoule only be 0 or 1). - volatile int32_t mUsers; - virtual void incUsers(); - virtual void decUsers(); - - mutable Mutex mServiceLock; - wp<Client> mClient; - -#if DEBUG_HEAP_LEAKS - wp<IMemoryHeap> gWeakHeap; -#endif }; -// ---------------------------------------------------------------------------- - -}; // namespace android +} // namespace android #endif |