/*
 * Copyright 2016 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.
 */

package android.hardware.broadcastradio@1.0;

enum Result : int32_t {
    OK,
    NOT_INITIALIZED,
    INVALID_ARGUMENTS,
    INVALID_STATE,
    TIMEOUT,
};

/**
 * Radio hardware module class. A given radio hardware module HAL is of one
 * class only. The platform can not have more than one hardware module of
 * each class. Current version of the framework only supports RADIO_CLASS_AM_FM.
 */
enum Class : uint32_t {
    /** FM (including HD radio) and AM */
    AM_FM = 0,
    /** Satellite Radio */
    SAT   = 1,
    /** Digital Radio (DAB) */
    DT    = 2,
};

/** value for field "type" of radio band described in struct radio_hal_band_config */
enum Band : uint32_t {
    /** Amplitude Modulation band: LW, MW, SW */
    AM     = 0,
    /** Frequency Modulation band: FM */
    FM     = 1,
    /** FM HD Radio / DRM (IBOC) */
    FM_HD  = 2,
    /** AM HD Radio / DRM (IBOC) */
    AM_HD  = 3,
};

/** RDS variant implemented. A struct FmBandConfig can list none or several. */
enum Rds : uint32_t {
    NONE   = 0,
    WORLD  = (1<<0),
    US = (1<<1),
};


/* FM deemphasis variant implemented.
 * A struct FmBandConfig can list one or more. */
enum Deemphasis : uint32_t {
    D50   = (1<<0),
    D75   = (1<<1),
};

/** Scanning direction for scan() and step() tuner APIs */
enum Direction : uint32_t {
    UP,
    DOWN
};

/** Unique handle allocated to a radio module */
typedef uint32_t Handle;


/** Additional attributes for an FM band configuration */
struct FmBandConfig {
    /** deemphasis variant */
    Deemphasis deemphasis;
    /** stereo supported */
    bool       stereo;
    /** RDS variants supported */
    Rds        rds;
    /** Traffic Announcement supported */
    bool       ta;
    /** Alternate Frequency supported */
    bool       af;
    /** Emergency announcements supported */
    bool       ea;
};

/** Additional attributes for an AM band configuration */
struct AmBandConfig {
    /** Stereo supported */
    bool       stereo;
};

/* Radio band configuration. Describes a given band supported by the radio
 * module. The HAL can expose only one band per type with the the maximum range
 * supported and all options. The framework will derive the actual regions were
 * this module can operate and expose separate band configurations for
 * applications to chose from. */
struct BandConfig {
    Band type;
    bool antennaConnected;
    uint32_t lowerLimit;
    uint32_t upperLimit;
    vec<uint32_t> spacings;
    union Ext {
        FmBandConfig fm;
        AmBandConfig am;
    } ext;
};

/* Exposes properties of a given hardware radio module.
 * NOTE: current framework implementation supports only one audio source
 * (num_audio_sources = 1). The source corresponds to AUDIO_DEVICE_IN_FM_TUNER.
 * If more than one tuner is supported (num_tuners > 1), only one can be
 * connected to the audio source. */
struct Properties {
    /** Class of this module. E.g AM_FM */
    Class           classId;
    /** implementor name */
    string          implementor;
    /** product name */
    string          product;
    /** product version */
    string          version;
    /** serial number (for subscription services) */
    string          serial;
    /** number of tuners controllable independently */
    uint32_t        numTuners;
    /** number of audio sources driven simultaneously */
    uint32_t        numAudioSources;
    /** the hardware supports capture of audio source from audio HAL */
    bool            supportsCapture;
    /** band descriptors */
    vec<BandConfig> bands;
};

enum MetadataType : int32_t {
    INVALID    = -1,
    /** Signed 32 bit integer  */
    INT        = 0,
    /** String */
    TEXT       = 1,
    /**
     * Raw binary data (icon or art).
     *
     * The data should be a valid PNG, JPEG, GIF or BMP file.
     * Invalid format must be handled gracefully as if the field was missing.
     */
    RAW        = 2,
    /** clock data, see MetaDataClock */
    CLOCK      = 3,
};

enum MetadataKey : int32_t {
    INVALID      = -1,
    /** RDS PI                 - int32_t  */
    RDS_PI       = 0,
    /** RDS PS                 - string */
    RDS_PS       = 1,
    /** RDS PTY                - int32_t  */
    RDS_PTY      = 2,
    /** RBDS PTY               - int32_t  */
    RBDS_PTY     = 3,
    /** RDS RT                 - string  */
    RDS_RT       = 4,
    /** Song title             - string  */
    TITLE        = 5,
    /** Artist name            - string  */
    ARTIST       = 6,
    /** Album name             - string  */
    ALBUM        = 7,
    /** Musical genre          - string  */
    GENRE        = 8,
    /** Station icon           - raw (int32_t for HAL 1.1) */
    ICON         = 9,
    /** Album art              - raw (int32_t for HAL 1.1) */
    ART          = 10,
    /** Clock                  - MetaDataClock */
    CLOCK        = 11,
};

struct MetaDataClock {
     /** Seconds since epoch at GMT + 0. */
    uint64_t utcSecondsSinceEpoch;
    /** Minutes offset from the GMT. */
    int32_t timezoneOffsetInMinutes;
};

struct MetaData {
    MetadataType type;
    MetadataKey key;
    /** Value used for type MetadataType.INT */
    int32_t intValue;
    /** Value used for type MetadataType.CLOCK */
    MetaDataClock  clockValue;
    /** Value used for type MetadataType.TEXT */
    string  stringValue;
    /** Value used for type MetadataType.RAW */
    vec<uint8_t> rawValue;
};


/* Radio program information. Returned by the HAL with event RADIO_EVENT_TUNED.
 * Contains information on currently tuned channel.
 */
struct ProgramInfo {
    uint32_t     channel;   /** current channel. (e.g kHz for band type AM_FM) */
    uint32_t     subChannel; /** current sub channel. (FM_HD) */

    /**
     * Tuned to a program (not a noise). It's the same condition that would
     * stop scan operation.
     */
    bool         tuned;

    bool         stereo;    /** program is stereo or not */
    bool         digital;   /** digital program or not (e.g HD Radio program) */

    /**
     * Signal quality measured in 0% to 100% range.
     *
     * Despite the name, this is not a signal strength.
     * The purpose of this field is primarily informative.
     */
    uint32_t signalStrength;

    /** Metadata: PTY, song title etc. */
    vec<MetaData> metadata;
};