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/*
* Copyright (C) 2008 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
*
* 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 <utils/Timers.h>
#include <camera/ICameraClient.h>
namespace android {
class ISurface;
/*
* 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
// msgType in notifyCallback and dataCallback functions
enum {
CAMERA_MSG_ERROR = 0x001,
CAMERA_MSG_SHUTTER = 0x002,
CAMERA_MSG_FOCUS = 0x004,
CAMERA_MSG_ZOOM = 0x008,
CAMERA_MSG_PREVIEW_FRAME = 0x010,
CAMERA_MSG_VIDEO_FRAME = 0x020,
CAMERA_MSG_POSTVIEW_FRAME = 0x040,
CAMERA_MSG_RAW_IMAGE = 0x080,
CAMERA_MSG_COMPRESSED_IMAGE = 0x100,
CAMERA_MSG_ALL_MSGS = 0x1FF
};
// cmdType in sendCommand functions
enum {
CAMERA_CMD_START_SMOOTH_ZOOM = 1,
CAMERA_CMD_STOP_SMOOTH_ZOOM = 2,
CAMERA_CMD_SET_DISPLAY_ORIENTATION = 3,
};
// camera fatal errors
enum {
CAMERA_ERROR_UKNOWN = 1,
CAMERA_ERROR_SERVER_DIED = 100
};
enum {
CAMERA_FACING_BACK = 0,
CAMERA_FACING_FRONT = 1 /* The camera faces to the user */
};
struct CameraInfo {
/**
* The direction that the camera faces to. It should be
* CAMERA_FACING_BACK or CAMERA_FACING_FRONT.
*/
int facing;
/**
* The orientation of the camera image. The value is the angle that the
* camera image needs to be rotated clockwise so it shows correctly on
* the display in its natural orientation. It should be 0, 90, 180, or 270.
*
* For example, suppose a device has a naturally tall screen, but the camera
* sensor is mounted in landscape. If the top side of the camera sensor is
* aligned with the right edge of the display in natural orientation, the
* value should be 90.
*/
int orientation;
};
class ICameraService;
class ICamera;
class Surface;
class Mutex;
class String8;
// ref-counted object for callbacks
class CameraListener: virtual public RefBase
{
public:
virtual void notify(int32_t msgType, int32_t ext1, int32_t ext2) = 0;
virtual void postData(int32_t msgType, const sp<IMemory>& dataPtr) = 0;
virtual void postDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr) = 0;
};
class Camera : public BnCameraClient, public IBinder::DeathRecipient
{
public:
// construct a camera client from an existing remote
static sp<Camera> create(const sp<ICamera>& camera);
static int32_t getNumberOfCameras();
static status_t getCameraInfo(int cameraId,
struct CameraInfo* cameraInfo);
static sp<Camera> connect(int cameraId);
~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();
// cancel auto focus
status_t cancelAutoFocus();
// 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;
// send command to camera driver
status_t sendCommand(int32_t cmd, int32_t arg1, int32_t arg2);
void setListener(const sp<CameraListener>& listener);
void setPreviewCallbackFlags(int preview_callback_flag);
// ICameraClient interface
virtual void notifyCallback(int32_t msgType, int32_t ext, int32_t ext2);
virtual void dataCallback(int32_t msgType, const sp<IMemory>& dataPtr);
virtual void dataCallbackTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr);
sp<ICamera> remote();
private:
Camera();
Camera(const Camera&);
Camera& operator=(const 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;
sp<CameraListener> mListener;
friend class DeathNotifier;
static Mutex mLock;
static sp<ICameraService> mCameraService;
};
}; // namespace android
#endif
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