197 lines
7.2 KiB
C++
197 lines
7.2 KiB
C++
/*
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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_HARDWARE_CAMERA_H
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#define ANDROID_HARDWARE_CAMERA_H
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#include <ui/ICameraClient.h>
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namespace android {
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/*
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* A set of bit masks for specifying how the received preview frames are
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* handled before the previewCallback() call.
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*
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* The least significant 3 bits of an "int" value are used for this purpose:
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*
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* ..... 0 0 0
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* ^ ^ ^
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* | | |---------> determine whether the callback is enabled or not
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* | |-----------> determine whether the callback is one-shot or not
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* |-------------> determine whether the frame is copied out or not
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*
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* WARNING:
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* When a frame is sent directly without copying, it is the frame receiver's
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* responsiblity to make sure that the frame data won't get corrupted by
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* subsequent preview frames filled by the camera. This flag is recommended
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* only when copying out data brings significant performance price and the
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* handling/processing of the received frame data is always faster than
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* the preview frame rate so that data corruption won't occur.
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*
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* For instance,
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* 1. 0x00 disables the callback. In this case, copy out and one shot bits
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* are ignored.
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* 2. 0x01 enables a callback without copying out the received frames. A
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* typical use case is the Camcorder application to avoid making costly
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* frame copies.
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* 3. 0x05 is enabling a callback with frame copied out repeatedly. A typical
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* use case is the Camera application.
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* 4. 0x07 is enabling a callback with frame copied out only once. A typical use
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* case is the Barcode scanner application.
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*/
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#define FRAME_CALLBACK_FLAG_ENABLE_MASK 0x01
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#define FRAME_CALLBACK_FLAG_ONE_SHOT_MASK 0x02
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#define FRAME_CALLBACK_FLAG_COPY_OUT_MASK 0x04
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// Typical use cases
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#define FRAME_CALLBACK_FLAG_NOOP 0x00
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#define FRAME_CALLBACK_FLAG_CAMCORDER 0x01
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#define FRAME_CALLBACK_FLAG_CAMERA 0x05
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#define FRAME_CALLBACK_FLAG_BARCODE_SCANNER 0x07
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class ICameraService;
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class ICamera;
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class Surface;
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class Mutex;
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class String8;
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typedef void (*shutter_callback)(void *cookie);
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typedef void (*frame_callback)(const sp<IMemory>& mem, void *cookie);
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typedef void (*autofocus_callback)(bool focused, void *cookie);
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typedef void (*error_callback)(status_t err, void *cookie);
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class Camera : public BnCameraClient, public IBinder::DeathRecipient
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{
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public:
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// construct a camera client from an existing remote
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Camera(const sp<ICamera>& camera);
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static sp<Camera> connect();
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~Camera();
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void init();
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status_t reconnect();
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void disconnect();
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status_t lock();
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status_t unlock();
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status_t getStatus() { return mStatus; }
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// pass the buffered ISurface to the camera service
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status_t setPreviewDisplay(const sp<Surface>& surface);
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status_t setPreviewDisplay(const sp<ISurface>& surface);
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// start preview mode, must call setPreviewDisplay first
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status_t startPreview();
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// stop preview mode
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void stopPreview();
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// get preview state
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bool previewEnabled();
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// start recording mode, must call setPreviewDisplay first
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status_t startRecording();
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// stop recording mode
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void stopRecording();
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// get recording state
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bool recordingEnabled();
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// release a recording frame
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void releaseRecordingFrame(const sp<IMemory>& mem);
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// autoFocus - status returned from callback
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status_t autoFocus();
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// take a picture - picture returned from callback
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status_t takePicture();
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// set preview/capture parameters - key/value pairs
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status_t setParameters(const String8& params);
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// get preview/capture parameters - key/value pairs
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String8 getParameters() const;
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void setShutterCallback(shutter_callback cb, void *cookie);
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void setRawCallback(frame_callback cb, void *cookie);
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void setJpegCallback(frame_callback cb, void *cookie);
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void setRecordingCallback(frame_callback cb, void *cookie);
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void setPreviewCallback(frame_callback cb, void *cookie, int preview_callback_flag = FRAME_CALLBACK_FLAG_NOOP);
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void setErrorCallback(error_callback cb, void *cookie);
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void setAutoFocusCallback(autofocus_callback cb, void *cookie);
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// ICameraClient interface
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virtual void shutterCallback();
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virtual void rawCallback(const sp<IMemory>& picture);
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virtual void jpegCallback(const sp<IMemory>& picture);
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virtual void previewCallback(const sp<IMemory>& frame);
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virtual void errorCallback(status_t error);
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virtual void autoFocusCallback(bool focused);
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virtual void recordingCallback(const sp<IMemory>& frame);
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sp<ICamera> remote();
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private:
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Camera();
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virtual void binderDied(const wp<IBinder>& who);
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class DeathNotifier: public IBinder::DeathRecipient
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{
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public:
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DeathNotifier() {
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}
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virtual void binderDied(const wp<IBinder>& who);
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};
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static sp<DeathNotifier> mDeathNotifier;
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// helper function to obtain camera service handle
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static const sp<ICameraService>& getCameraService();
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sp<ICamera> mCamera;
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status_t mStatus;
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shutter_callback mShutterCallback;
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void *mShutterCallbackCookie;
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frame_callback mRawCallback;
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void *mRawCallbackCookie;
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frame_callback mJpegCallback;
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void *mJpegCallbackCookie;
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frame_callback mPreviewCallback;
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void *mPreviewCallbackCookie;
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frame_callback mRecordingCallback;
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void *mRecordingCallbackCookie;
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error_callback mErrorCallback;
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void *mErrorCallbackCookie;
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autofocus_callback mAutoFocusCallback;
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void *mAutoFocusCallbackCookie;
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friend class DeathNotifier;
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static Mutex mLock;
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static sp<ICameraService> mCameraService;
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};
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}; // namespace android
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#endif
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