182 lines
6.9 KiB
C++
182 lines
6.9 KiB
C++
/*
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**
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** Copyright (C) 2008, The Android Open Source Project
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** Copyright (C) 2008 HTC Inc.
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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#ifndef ANDROID_SERVERS_CAMERA_CAMERASERVICE_H
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#define ANDROID_SERVERS_CAMERA_CAMERASERVICE_H
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#include <ui/ICameraService.h>
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#include <ui/CameraHardwareInterface.h>
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#include <ui/Camera.h>
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class android::MemoryHeapBase;
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namespace android {
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// ----------------------------------------------------------------------------
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#define LIKELY( exp ) (__builtin_expect( (exp) != 0, true ))
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#define UNLIKELY( exp ) (__builtin_expect( (exp) != 0, false ))
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// When enabled, this feature allows you to send an event to the CameraService
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// so that you can cause all references to the heap object gWeakHeap, defined
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// below, to be printed. You will also need to set DEBUG_REFS=1 and
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// DEBUG_REFS_ENABLED_BY_DEFAULT=0 in libutils/RefBase.cpp. You just have to
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// set gWeakHeap to the appropriate heap you want to track.
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#define DEBUG_HEAP_LEAKS 0
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// ----------------------------------------------------------------------------
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class CameraService : public BnCameraService
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{
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class Client;
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public:
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static void instantiate();
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// ICameraService interface
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virtual sp<ICamera> connect(const sp<ICameraClient>& cameraClient);
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virtual status_t dump(int fd, const Vector<String16>& args);
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void removeClient(const sp<ICameraClient>& cameraClient);
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#if DEBUG_HEAP_LEAKS
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virtual status_t onTransact(
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uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags);
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#endif
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private:
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// ----------------------------------------------------------------------------
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class Client : public BnCamera {
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public:
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virtual void disconnect();
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// connect new client with existing camera remote
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virtual status_t connect(const sp<ICameraClient>& client);
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// prevent other processes from using this ICamera interface
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virtual status_t lock();
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// allow other processes to use this ICamera interface
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virtual status_t unlock();
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// pass the buffered ISurface to the camera service
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virtual status_t setPreviewDisplay(const sp<ISurface>& surface);
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// set the frame callback flag to affect how the received frames from
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// preview are handled.
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virtual void setFrameCallbackFlag(int frame_callback_flag);
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// start preview mode, must call setPreviewDisplay first
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virtual status_t startPreview();
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// stop preview mode
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virtual void stopPreview();
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// get preview state
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virtual bool previewEnabled();
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// auto focus
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virtual status_t autoFocus();
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// take a picture - returns an IMemory (ref-counted mmap)
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virtual status_t takePicture();
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// set preview/capture parameters - key/value pairs
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virtual status_t setParameters(const String8& params);
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// get preview/capture parameters - key/value pairs
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virtual String8 getParameters() const;
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// our client...
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const sp<ICameraClient>& getCameraClient() const { return mCameraClient; }
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private:
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friend class CameraService;
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Client(const sp<CameraService>& cameraService,
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const sp<ICameraClient>& cameraClient,
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pid_t clientPid);
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Client();
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virtual ~Client();
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status_t checkPid();
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static void previewCallback(const sp<IMemory>& mem, void* user);
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static void shutterCallback(void *user);
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static void yuvPictureCallback(const sp<IMemory>& mem, void* user);
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static void jpegPictureCallback(const sp<IMemory>& mem, void* user);
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static void autoFocusCallback(bool focused, void* user);
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static sp<Client> getClientFromCookie(void* user);
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void postShutter();
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void postRaw(const sp<IMemory>& mem);
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void postJpeg(const sp<IMemory>& mem);
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void postFrame(const sp<IMemory>& mem);
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void copyFrameAndPostCopiedFrame(sp<IMemoryHeap> heap, size_t offset, size_t size);
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void postError(status_t error);
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void postAutoFocus(bool focused);
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// Ensures atomicity among the public methods
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mutable Mutex mLock;
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// mSurfaceLock synchronizes access to mSurface between
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// setPreviewSurface() and postFrame(). Note that among
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// the public methods, all accesses to mSurface are
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// syncrhonized by mLock. However, postFrame() is called
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// by the CameraHardwareInterface callback, and needs to
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// access mSurface. It cannot hold mLock, however, because
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// stopPreview() may be holding that lock while attempting
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// to stop preview, and stopPreview itself will block waiting
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// for a callback from CameraHardwareInterface. If this
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// happens, it will cause a deadlock.
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mutable Mutex mSurfaceLock;
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mutable Condition mReady;
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sp<CameraService> mCameraService;
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sp<ISurface> mSurface;
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sp<MemoryHeapBase> mPreviewBuffer;
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int mFrameCallbackFlag;
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// these are immutable once the object is created,
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// they don't need to be protected by a lock
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sp<ICameraClient> mCameraClient;
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sp<CameraHardwareInterface> mHardware;
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pid_t mClientPid;
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};
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// ----------------------------------------------------------------------------
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CameraService();
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virtual ~CameraService();
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mutable Mutex mLock;
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wp<Client> mClient;
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#if DEBUG_HEAP_LEAKS
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wp<IMemoryHeap> gWeakHeap;
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#endif
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};
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// ----------------------------------------------------------------------------
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}; // namespace android
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#endif
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