/*
 * Copyright 2008, The Android Open Source Project
 * Copyright 2013, Samsung Electronics Co. LTD
 *
 * 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.
 */

 /*!
 * \file      Exif.h
 * \brief     source file for Android Camera Ext HAL
 * \author    teahyung kim (tkon.kim@samsung.com)
 * \date      2013/04/30
 *
 */

#ifndef ANDROID_HARDWARE_EXIF_H
#define ANDROID_HARDWARE_EXIF_H

#include <math.h>

#define EXIF_LOG2(x)			(log((double)(x))/log(2.0))
#define ROUND(x, y)			((x) >= 0 ? \
					((x)*(double)pow(10.0, y) + 0.5)/(double)pow(10.0, y) : \
					((x)*(double)pow(10.0, y) - 0.5)/(double)pow(10.0, y))
#define APEX_FNUM_TO_APERTURE(x)	ROUND(EXIF_LOG2((double)x)*2, 2)
#define APEX_EXPOSURE_TO_SHUTTER(x)	ROUND(EXIF_LOG2((double)x), 2)
#define APEX_ISO_TO_FILMSENSITIVITY(x) ROUND(EXIF_LOG2((x)/3.125), 2)
#define APEX_SHUTTER_TO_EXPOSURE(x)	ROUND((double)pow(2.0, x), 0)

#define NUM_SIZE        2
#define IFD_SIZE        12
#define OFFSET_SIZE     4

/* Type */
#define EXIF_TYPE_BYTE        1
#define EXIF_TYPE_ASCII       2
#define EXIF_TYPE_SHORT       3
#define EXIF_TYPE_LONG        4
#define EXIF_TYPE_RATIONAL    5
#define EXIF_TYPE_UNDEFINED   7
#define EXIF_TYPE_SLONG       9
#define EXIF_TYPE_SRATIONAL   10

#define EXIF_MAX_LEN		0x18000

/* 0th IFD TIFF Tags  */
#define EXIF_TAG_IMAGE_WIDTH         0x0100
#define EXIF_TAG_IMAGE_HEIGHT        0x0101
#define EXIF_TAG_MAKE                0x010f
#define EXIF_TAG_MODEL               0x0110
#define EXIF_TAG_ORIENTATION         0x0112
#define EXIF_TAG_SOFTWARE            0x0131
#define EXIF_TAG_DATE_TIME           0x0132
#define EXIF_TAG_YCBCR_POSITIONING   0x0213
#define EXIF_TAG_EXIF_IFD_POINTER    0x8769
#define EXIF_TAG_GPS_IFD_POINTER     0x8825

/* 0th IFD Exif Private Tags */
#define EXIF_TAG_EXPOSURE_TIME       0x829A
#define EXIF_TAG_FNUMBER             0x829D
#define EXIF_TAG_EXPOSURE_PROGRAM    0x8822
#define EXIF_TAG_ISO_SPEED_RATING    0x8827
#define EXIF_TAG_EXIF_VERSION        0x9000
#define EXIF_TAG_DATE_TIME_ORG       0x9003
#define EXIF_TAG_DATE_TIME_DIGITIZE  0x9004
#define EXIF_TAG_SHUTTER_SPEED       0x9201
#define EXIF_TAG_APERTURE            0x9202
#define EXIF_TAG_BRIGHTNESS          0x9203
#define EXIF_TAG_EXPOSURE_BIAS       0x9204
#define EXIF_TAG_MAX_APERTURE        0x9205
#define EXIF_TAG_METERING_MODE       0x9207
#define EXIF_TAG_LIGHT_SOURCE	0x9208
#define EXIF_TAG_FLASH               0x9209
#define EXIF_TAG_FOCAL_LENGTH        0x920A
#define EXIF_TAG_FOCAL_35mm_LENGTH		0xA405
#define EXIF_TAG_DIGITAL_ZOOM_RATIO	0xA404
#define EXIF_TAG_USER_COMMENT        0x9286
#define EXIF_TAG_COLOR_SPACE         0xA001
#define EXIF_TAG_SENSING_METHOD		0xA217
#define EXIF_TAG_PIXEL_X_DIMENSION   0xA002
#define EXIF_TAG_PIXEL_Y_DIMENSION   0xA003
#define EXIF_TAG_EXPOSURE_MODE       0xA402
#define EXIF_TAG_WHITE_BALANCE       0xA403
#define EXIF_TAG_SCENCE_CAPTURE_TYPE 0xA406
#define EXIF_TAG_IMAGE_UNIQUE_ID     0xA420
#define EXIF_TAG_CONTINUOUS_SHOT_INFO 0x000B

/* 0th IFD GPS Info Tags */
#define EXIF_TAG_GPS_VERSION_ID      0x0000
#define EXIF_TAG_GPS_LATITUDE_REF    0x0001
#define EXIF_TAG_GPS_LATITUDE        0x0002
#define EXIF_TAG_GPS_LONGITUDE_REF   0x0003
#define EXIF_TAG_GPS_LONGITUDE       0x0004
#define EXIF_TAG_GPS_ALTITUDE_REF    0x0005
#define EXIF_TAG_GPS_ALTITUDE        0x0006
#define EXIF_TAG_GPS_TIMESTAMP       0x0007
#define EXIF_TAG_GPS_PROCESSING_METHOD 0x001B
#define EXIF_TAG_GPS_DATESTAMP       0x001D

/* 1th IFD TIFF Tags */
#define EXIF_TAG_COMPRESSION_SCHEME  0x0103
#define EXIF_TAG_X_RESOLUTION        0x011A
#define EXIF_TAG_Y_RESOLUTION        0x011B
#define EXIF_TAG_RESOLUTION_UNIT     0x0128
#define EXIF_TAG_JPEG_INTERCHANGE_FORMAT 0x0201
#define EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LEN 0x0202

namespace android {
typedef enum {
    EXIF_ORIENTATION_UP    = 1,
    EXIF_ORIENTATION_90    = 6,
    EXIF_ORIENTATION_180   = 3,
    EXIF_ORIENTATION_270   = 8,
} ExifOrientationType;

typedef enum {
    EXIF_SCENE_STANDARD,
    EXIF_SCENE_LANDSCAPE,
    EXIF_SCENE_PORTRAIT,
    EXIF_SCENE_NIGHT,
} CamExifSceneCaptureType;

typedef enum {
    EXIF_METERING_UNKNOWN,
    EXIF_METERING_AVERAGE,
    EXIF_METERING_CENTER,
    EXIF_METERING_SPOT,
    EXIF_METERING_MULTISPOT,
    EXIF_METERING_PATTERN,
    EXIF_METERING_PARTIAL,
    EXIF_METERING_OTHER = 255,
} CamExifMeteringModeType;

typedef enum {
    EXIF_EXPOSURE_AUTO,
    EXIF_EXPOSURE_MANUAL,
    EXIF_EXPOSURE_AUTO_BRACKET,
} CamExifExposureModeType;

typedef enum {
    EXIF_WB_AUTO,
    EXIF_WB_MANUAL,
} CamExifWhiteBalanceType;

typedef enum {
    EXIF_EXP_PROGRAM_NOT_DEFINE,
    EXIF_EXP_PROGRAM_MANUAL,
    EXIF_EXP_PROGRAM_NORMAL_PROGRAM,
    EXIF_EXP_PROGRAM_APERTURE_PRIO,
    EXIF_EXP_PROGRAM_SHUTTER_PRIO,
    EXIF_EXP_PROGRAM_CREATIVE_PROGRAM,
    EXIF_EXP_PROGRAM_ACTION_PROGRAM,
    EXIF_EXP_PROGRAM_PORTRAIT_MODE,
    EXIF_EXP_PROGRAM_LANDSCAPE_MODE,
} CamExifExposureProgramType;

enum {
    CAMERA_TYPE_SOC,
    CAMERA_TYPE_ISP,
};

typedef struct {
    uint32_t num;
    uint32_t den;
} rational_t;

typedef struct {
    int32_t num;
    int32_t den;
} srational_t;

typedef struct {
    bool enableGps;

    unsigned char maker[32];
    unsigned char model[32];
    unsigned char software[32];
    unsigned char exif_version[4];
    unsigned char date_time[20];
    unsigned char user_comment[128];
    unsigned char unique_id[12];

    uint32_t width;
    uint32_t height;
    uint32_t widthThumb;
    uint32_t heightThumb;
	uint32_t cShotInfo;

    uint16_t orientation;
    uint16_t ycbcr_positioning;
    uint16_t exposure_program;
    uint16_t iso_speed_rating;
    uint16_t metering_mode;
	uint16_t light_source;
    uint16_t flash;
    uint16_t color_space;
    uint16_t exposure_mode;
    uint16_t white_balance;
    uint16_t scene_capture_type;
    uint16_t focal_35mm_length;
    uint16_t sensing_method;

    rational_t exposure_time;
    rational_t fnumber;
    rational_t aperture;
    rational_t max_aperture;
    rational_t focal_length;
    rational_t digital_zoom_ratio;

    srational_t shutter_speed;
    srational_t brightness;
    srational_t exposure_bias;

    unsigned char gps_latitude_ref[2];
    unsigned char gps_longitude_ref[2];

    uint8_t gps_version_id[4];
    uint8_t gps_altitude_ref;

    rational_t gps_latitude[3];
    rational_t gps_longitude[3];
    rational_t gps_altitude;
    rational_t gps_timestamp[3];
    unsigned char gps_datestamp[11];
    unsigned char gps_processing_method[128];

    rational_t x_resolution;
    rational_t y_resolution;
    uint16_t resolution_unit;
    uint16_t compression_scheme;
} exif_attribute_t;

class Exif {
public:
    Exif(int cameraId, int CameraType = CAMERA_TYPE_ISP);
    virtual ~Exif();

    uint32_t make(void *exifOut,
        exif_attribute_t *exifInfo,
        unsigned int exifOutBufSize = 0,
        unsigned char *thumbBuf = NULL,
        unsigned int thumbSize = 0);

    static const char DEFAULT_MAKER[];
    static const char DEFAULT_MODEL[];
    static const char DEFAULT_SOFTWARE[];
    static const char DEFAULT_EXIF_VERSION[];
    static const char DEFAULT_USERCOMMENTS[];

    static const int DEFAULT_YCBCR_POSITIONING;
    static const int DEFAULT_BACK_FNUMBER_NUM;
    static const int DEFAULT_BACK_FNUMBER_DEN;
    static const int DEFAULT_FRONT_FNUMBER_NUM;
    static const int DEFAULT_FRONT_FNUMBER_DEN;
    static const int DEFAULT_EXPOSURE_PROGRAM;
    static const int DEFAULT_BACK_FOCAL_LEN_NUM;
    static const int DEFAULT_BACK_FOCAL_LEN_DEN;
    static const int DEFAULT_FRONT_FOCAL_LEN_NUM;
    static const int DEFAULT_FRONT_FOCAL_LEN_DEN;
    static const int DEFAULT_FLASH;
    static const int DEFAULT_COLOR_SPACE;
    static const int DEFAULT_EXPOSURE_MODE;
    static const int DEFAULT_APEX_DEN;
    static const int DEFAULT_SENSING_METHOD;

    static const int DEFAULT_COMPRESSION;
    static const int DEFAULT_RESOLUTION_NUM;
    static const int DEFAULT_RESOLUTION_DEN;
    static const int DEFAULT_RESOLUTION_UNIT;

	static const int DEFAULT_CONTINUOUS_SHOT_INFO;

private:
    int mCameraId;

    int mNum0thIfdTiff;
    int mNum0thIfdExif;
    int mNum0thIfdGps;
    int mNum1thIfdTiff;
    int mCameraType;  /* ISP or SOC */

    inline void writeExifIfd(unsigned char **pCur,
        unsigned short tag,
        unsigned short type,
        unsigned int count,
        uint32_t value);
    inline void writeExifIfd(unsigned char **pCur,
        unsigned short tag,
        unsigned short type,
        unsigned int count,
        unsigned char *pValue);
    inline void writeExifIfd(unsigned char **pCur,
        unsigned short tag,
        unsigned short type,
        unsigned int count,
        rational_t *pValue,
        unsigned int *offset,
        unsigned char *start);
    inline void writeExifIfd(unsigned char **pCur,
        unsigned short tag,
        unsigned short type,
        unsigned int count,
        unsigned char *pValue,
        unsigned int *offset,
        unsigned char *start);
};
};
#endif /* ANDROID_HARDWARE_EXIF_H */