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/*
**
** Copyright (C) 2008, The Android Open Source Project
** Copyright (C) 2008 HTC Inc.
**
** 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
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#ifndef ANDROID_SERVERS_CAMERA_CAMERASERVICE_H
#define ANDROID_SERVERS_CAMERA_CAMERASERVICE_H
#include <ui/ICameraService.h>
#include <ui/CameraHardwareInterface.h>
#include <ui/Camera.h>
class android::MemoryHeapBase;
namespace android {
// ----------------------------------------------------------------------------
#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 Client;
public:
static void instantiate();
// ICameraService interface
virtual sp<ICamera> connect(const sp<ICameraClient>& cameraClient);
virtual status_t dump(int fd, const Vector<String16>& args);
void removeClient(const sp<ICameraClient>& cameraClient);
#if DEBUG_HEAP_LEAKS
virtual status_t onTransact(
uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags);
#endif
private:
// ----------------------------------------------------------------------------
class Client : public BnCamera {
public:
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 frame callback flag to affect how the received frames from
// preview are handled.
virtual void setFrameCallbackFlag(int frame_callback_flag);
// start preview mode, must call setPreviewDisplay first
virtual status_t startPreview();
// stop preview mode
virtual void stopPreview();
// get preview state
virtual bool previewEnabled();
// auto focus
virtual status_t autoFocus();
// 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;
// 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 previewCallback(const sp<IMemory>& mem, void* user);
static void shutterCallback(void *user);
static void yuvPictureCallback(const sp<IMemory>& mem, void* user);
static void jpegPictureCallback(const sp<IMemory>& mem, void* user);
static void autoFocusCallback(bool focused, void* user);
static sp<Client> getClientFromCookie(void* user);
void postShutter();
void postRaw(const sp<IMemory>& mem);
void postJpeg(const sp<IMemory>& mem);
void postFrame(const sp<IMemory>& mem);
void copyFrameAndPostCopiedFrame(sp<IMemoryHeap> heap, size_t offset, size_t size);
void postError(status_t error);
void postAutoFocus(bool focused);
// Ensures atomicity among the public methods
mutable Mutex mLock;
// mSurfaceLock synchronizes access to mSurface between
// setPreviewSurface() and postFrame(). Note that among
// the public methods, all accesses to mSurface are
// syncrhonized by mLock. However, postFrame() 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;
sp<MemoryHeapBase> mPreviewBuffer;
int mFrameCallbackFlag;
// 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;
};
// ----------------------------------------------------------------------------
CameraService();
virtual ~CameraService();
mutable Mutex mLock;
wp<Client> mClient;
#if DEBUG_HEAP_LEAKS
wp<IMemoryHeap> gWeakHeap;
#endif
};
// ----------------------------------------------------------------------------
}; // namespace android
#endif
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