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