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* Copyright (C) 2012 The Android Open Source Project
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include "CameraService.h"
namespace android {
class MemoryHeapBase;
class CameraHardwareInterface;
class CameraClient : public CameraService::Client
// ICamera interface (see ICamera for details)
virtual void disconnect();
virtual status_t connect(const sp<ICameraClient>& client);
virtual status_t lock();
virtual status_t unlock();
virtual status_t setPreviewDisplay(const sp<Surface>& surface);
virtual status_t setPreviewTexture(const sp<ISurfaceTexture>& surfaceTexture);
virtual void setPreviewCallbackFlag(int flag);
virtual status_t startPreview();
virtual void stopPreview();
virtual bool previewEnabled();
virtual status_t storeMetaDataInBuffers(bool enabled);
virtual status_t startRecording();
virtual void stopRecording();
virtual bool recordingEnabled();
virtual void releaseRecordingFrame(const sp<IMemory>& mem);
virtual status_t autoFocus();
virtual status_t cancelAutoFocus();
virtual status_t takePicture(int msgType);
virtual status_t setParameters(const String8& params);
virtual String8 getParameters() const;
virtual status_t sendCommand(int32_t cmd, int32_t arg1, int32_t arg2);
// Interface used by CameraService
CameraClient(const sp<CameraService>& cameraService,
const sp<ICameraClient>& cameraClient,
int cameraId,
int cameraFacing,
int clientPid,
int servicePid);
status_t initialize(camera_module_t *module);
status_t dump(int fd, const Vector<String16>& args);
// check whether the calling process matches mClientPid.
status_t checkPid() const;
status_t checkPidAndHardware() const; // also check mHardware != 0
// these are internal functions used to set up preview buffers
status_t registerPreviewBuffers();
// 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();
// internal function used by sendCommand to enable/disable shutter sound.
status_t enableShutterSound(bool enable);
// 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,
camera_frame_metadata_t *metadata, void* user);
static void dataCallbackTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr, void* user);
// handlers for messages
void handleShutter(void);
void handlePreviewData(int32_t msgType, const sp<IMemory>& mem,
camera_frame_metadata_t *metadata);
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,
camera_frame_metadata_t *metadata);
void handleGenericDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr);
void copyFrameAndPostCopiedFrame(
int32_t msgType,
const sp<ICameraClient>& client,
const sp<IMemoryHeap>& heap,
size_t offset, size_t size,
camera_frame_metadata_t *metadata);
int getOrientation(int orientation, bool mirror);
status_t setPreviewWindow(
const sp<IBinder>& binder,
const sp<ANativeWindow>& window);
// these are initialized in the constructor.
sp<CameraHardwareInterface> mHardware; // cleared after disconnect()
int mPreviewCallbackFlag;
int mOrientation; // Current display orientation
bool mPlayShutterSound;
// Ensures atomicity among the public methods
mutable Mutex mLock;
// This is a binder of Surface or SurfaceTexture.
sp<IBinder> mSurface;
sp<ANativeWindow> mPreviewWindow;
// 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);