/* Copyright (C) 2017 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@2.0;

/** Constants used by broadcast radio HAL. */
enum Constants : int32_t {
    /** Invalid identifier for IBroadcastRadio::getImage. */
    INVALID_IMAGE = 0,

    /**
     * If the antenna is disconnected from the beginning, the
     * onAntennaStateChange callback must be called within this time.
     */
    ANTENNA_DISCONNECTED_TIMEOUT_MS = 100,

    LIST_COMPLETE_TIMEOUT_MS = 300000,
};

enum Result : int32_t {
    OK,
    UNKNOWN_ERROR,
    INTERNAL_ERROR,
    INVALID_ARGUMENTS,
    INVALID_STATE,
    NOT_SUPPORTED,
    TIMEOUT,
};

/**
 * Configuration flags to be used with isConfigFlagSet and setConfigFlag methods
 * of ITunerSession.
 */
enum ConfigFlag : uint32_t {
    /**
     * Forces mono audio stream reception.
     *
     * Analog broadcasts can recover poor reception conditions by jointing
     * stereo channels into one. Mainly for, but not limited to AM/FM.
     */
    FORCE_MONO = 1,

    /**
     * Forces the analog playback for the supporting radio technology.
     *
     * User may disable digital playback for FM HD Radio or hybrid FM/DAB with
     * this option. This is purely user choice, ie. does not reflect digital-
     * analog handover state managed from the HAL implementation side.
     *
     * Some radio technologies may not support this, ie. DAB.
     */
    FORCE_ANALOG,

    /**
     * Forces the digital playback for the supporting radio technology.
     *
     * User may disable digital-analog handover that happens with poor
     * reception conditions. With digital forced, the radio will remain silent
     * instead of switching to analog channel if it's available. This is purely
     * user choice, it does not reflect the actual state of handover.
     */
    FORCE_DIGITAL,

    /**
     * RDS Alternative Frequencies.
     *
     * If set and the currently tuned RDS station broadcasts on multiple
     * channels, radio tuner automatically switches to the best available
     * alternative.
     */
    RDS_AF,

    /**
     * RDS region-specific program lock-down.
     *
     * Allows user to lock to the current region as they move into the
     * other region.
     */
    RDS_REG,

    /** Enables DAB-DAB hard- and implicit-linking (the same content). */
    DAB_DAB_LINKING,

    /** Enables DAB-FM hard- and implicit-linking (the same content). */
    DAB_FM_LINKING,

    /** Enables DAB-DAB soft-linking (related content). */
    DAB_DAB_SOFT_LINKING,

    /** Enables DAB-FM soft-linking (related content). */
    DAB_FM_SOFT_LINKING,
};

/**
 * A key-value pair for vendor-specific information to be passed as-is through
 * Android framework to the front-end application.
 */
struct VendorKeyValue {
    /**
     * Key must start with unique vendor Java-style namespace,
     * eg. 'com.somecompany.parameter1'.
     */
    string key;

    /**
     * Value must be passed through the framework without any changes.
     * Format of this string can vary across vendors.
     */
    string value;
};

/**
 * A supported or configured RDS variant.
 *
 * Both might be set for hardware capabilities check (with full=true when
 * calling getAmFmRegionConfig), but only one (or none) for specific
 * region settings.
 */
enum Rds : uint8_t {
    /** Standard variant, used everywhere except North America. */
    RDS = 1 << 0,

    /** Variant used in North America. */
    RBDS = 1 << 1,
};

/**
 * FM de-emphasis filter supported or configured.
 *
 * Both might be set for hardware capabilities check (with full=true when
 * calling getAmFmRegionConfig), but exactly one for specific region settings.
 */
enum Deemphasis : uint8_t {
    D50 = 1 << 0,
    D75 = 1 << 1,
};

/**
 * Regional configuration for AM/FM.
 *
 * For hardware capabilities check (with full=true when calling
 * getAmFmRegionConfig), HAL implementation fills entire supported range of
 * frequencies and features.
 *
 * When checking current configuration, at most one bit in each bitfield
 * can be set.
 */
struct AmFmRegionConfig {
    /**
     * All supported or configured AM/FM bands.
     *
     * AM/FM bands are identified by frequency value
     * (see IdentifierType::AMFM_FREQUENCY).
     *
     * With typical configuration, it's expected to have two frequency ranges
     * for capabilities check (AM and FM) and four ranges for specific region
     * configuration (AM LW, AM MW, AM SW, FM).
     */
    vec<AmFmBandRange> ranges;

    /** De-emphasis filter supported/configured. */
    bitfield<Deemphasis> fmDeemphasis;

    /** RDS/RBDS variant supported/configured. */
    bitfield<Rds> fmRds;
};

/**
 * AM/FM band range for region configuration.
 *
 * Defines channel grid: each possible channel is set at
 * lowerBound + channelNumber * spacing, up to upperBound.
 */
struct AmFmBandRange {
    /** The frequency (in kHz) of the first channel within the range. */
    uint32_t lowerBound;

    /** The frequency (in kHz) of the last channel within the range. */
    uint32_t upperBound;

    /** Channel grid resolution (in kHz), how far apart are the channels. */
    uint32_t spacing;

    /**
     * Channel spacing (in kHz) used to speed up seeking to the next station
     * via the ITunerSession::scan() operation.
     *
     * It must be a multiple of channel grid resolution.
     *
     * Tuner may first quickly check every n-th channel and if it detects echo
     * from a station, it fine-tunes to find the exact frequency.
     *
     * It's ignored for capabilities check (with full=true when calling
     * getAmFmRegionConfig).
     */
    uint32_t scanSpacing;
};

/**
 * An entry in regional configuration for DAB.
 *
 * Defines a frequency table row for ensembles.
 */
struct DabTableEntry {
    /**
     * Channel name, i.e. 5A, 7B.
     *
     * It must match the following regular expression:
     * /^[A-Z0-9][A-Z0-9 ]{0,5}[A-Z0-9]$/ (2-7 uppercase alphanumeric characters
     * without spaces allowed at the beginning nor end).
     */
    string label;

    /** Frequency, in kHz. */
    uint32_t frequency;
};

/**
 * Properties of a given broadcast radio module.
 */
struct Properties {
    /**
     * A company name who made the radio module. Must be a valid, registered
     * name of the company itself.
     *
     * It must be opaque to the Android framework.
     */
    string maker;

    /**
     * A product name. Must be unique within the company.
     *
     * It must be opaque to the Android framework.
     */
    string product;

    /**
     * Version of the hardware module.
     *
     * It must be opaque to the Android framework.
     */
    string version;

    /**
     * Hardware serial number (for subscription services).
     *
     * It must be opaque to the Android framework.
     */
    string serial;

    /**
     * A list of supported IdentifierType values.
     *
     * If an identifier is supported by radio module, it means it can use it for
     * tuning to ProgramSelector with either primary or secondary Identifier of
     * a given type.
     *
     * Support for VENDOR identifier type does not guarantee compatibility, as
     * other module properties (implementor, product, version) must be checked.
     */
    vec<uint32_t> supportedIdentifierTypes;

    /**
     * Vendor-specific information.
     *
     * It may be used for extra features, not supported by the platform,
     * for example: com.me.preset-slots=6; com.me.ultra-hd-capable=false.
     */
    vec<VendorKeyValue> vendorInfo;
};

/**
 * Program (channel, station) information.
 *
 * Carries both user-visible information (like station name) and technical
 * details (tuning selector).
 */
struct ProgramInfo {
    /**
     * An identifier used to point at the program (primarily to tune to it).
     *
     * This field is required - its type field must not be set to
     * IdentifierType::INVALID.
     */
    ProgramSelector selector;

    /**
     * Identifier currently used for program selection.
     *
     * It allows to determine which technology is currently used for reception.
     *
     * Some program selectors contain tuning information for different radio
     * technologies (i.e. FM RDS and DAB). For example, user may tune using
     * a ProgramSelector with RDS_PI primary identifier, but the tuner hardware
     * may choose to use DAB technology to make actual tuning. This identifier
     * must reflect that.
     *
     * This field is required for currently tuned program only.
     * For all other items on the program list, its type field must be
     * initialized to IdentifierType::INVALID.
     *
     * Only primary identifiers for a given radio technology are valid:
     *  - AMFM_FREQUENCY for analog AM/FM;
     *  - RDS_PI for FM RDS;
     *  - HD_STATION_ID_EXT;
     *  - DAB_SID_EXT;
     *  - DRMO_SERVICE_ID;
     *  - SXM_SERVICE_ID;
     *  - VENDOR_*;
     *  - more might come in next minor versions of this HAL.
     */
    ProgramIdentifier logicallyTunedTo;

    /**
     * Identifier currently used by hardware to physically tune to a channel.
     *
     * Some radio technologies broadcast the same program on multiple channels,
     * i.e. with RDS AF the same program may be broadcasted on multiple
     * alternative frequencies; the same DAB program may be broadcast on
     * multiple ensembles. This identifier points to the channel to which the
     * radio hardware is physically tuned to.
     *
     * This field is required for currently tuned program only.
     * For all other items on the program list, its type field must be
     * initialized to IdentifierType::INVALID.
     *
     * Only physical identifiers are valid:
     *  - AMFM_FREQUENCY;
     *  - DAB_ENSEMBLE;
     *  - DRMO_FREQUENCY;
     *  - SXM_CHANNEL;
     *  - VENDOR_*;
     *  - more might come in next minor versions of this HAL.
     */
    ProgramIdentifier physicallyTunedTo;

    /**
     * Primary identifiers of related contents.
     *
     * Some radio technologies provide pointers to other programs that carry
     * related content (i.e. DAB soft-links). This field is a list of pointers
     * to other programs on the program list.
     *
     * This is not a list of programs that carry the same content (i.e.
     * DAB hard-links, RDS AF). Switching to programs from this list usually
     * require user action.
     *
     * Please note, that these identifiers do not have to exist on the program
     * list - i.e. DAB tuner may provide information on FM RDS alternatives
     * despite not supporting FM RDS. If the system has multiple tuners, another
     * one may have it on its list.
     *
     * This field is optional (can be empty).
     */
    vec<ProgramIdentifier> relatedContent;

    bitfield<ProgramInfoFlags> infoFlags;

    /**
     * Signal quality measured in 0% to 100% range to be shown in the UI.
     *
     * The purpose of this field is primarily informative, must not be used to
     * determine to which frequency should it tune to.
     */
    uint32_t signalQuality;

    /**
     * Program metadata (station name, PTY, song title).
     */
    vec<Metadata> metadata;

    /**
     * Vendor-specific information.
     *
     * It may be used for extra features, not supported by the platform,
     * for example: paid-service=true; bitrate=320kbps.
     */
    vec<VendorKeyValue> vendorInfo;
};

enum ProgramInfoFlags : uint32_t {
    /**
     * Set when the program is currently playing live stream.
     * This may result in a slightly altered reception parameters,
     * usually targetted at reduced latency.
     */
    LIVE = 1 << 0,

    /**
     * Radio stream is not playing, ie. due to bad reception conditions or
     * buffering. In this state volume knob MAY be disabled to prevent user
     * increasing volume too much.
     */
    MUTED = 1 << 1,

    /**
     * Station broadcasts traffic information regularly,
     * but not necessarily right now.
     */
    TRAFFIC_PROGRAM = 1 << 2,

    /**
     * Station is broadcasting traffic information at the very moment.
     */
    TRAFFIC_ANNOUNCEMENT = 1 << 3,

    /**
     * Tuned to a program (not playing static).
     *
     * It's the same condition that would stop a seek operation
     * (ie: ITunerSession::scan()).
     *
     * By definition, this flag must be set for all items on the program list.
     */
    TUNED = 1 << 4,

    /**
     * Audio stream is MONO if this bit is not set.
     */
    STEREO = 1 << 5,
};

/**
 * Type of program identifier component.
 *
 * Each identifier type corresponds to exactly one radio technology,
 * i.e. DAB_ENSEMBLE is specifically for DAB.
 *
 * VENDOR identifier types must be opaque to the framework.
 *
 * The value format for each (but VENDOR_*) identifier is strictly defined
 * to maintain interoperability between devices made by different vendors.
 *
 * All other values are reserved for future use.
 * Values not matching any enumerated constant must be ignored.
 */
enum IdentifierType : uint32_t {
    /**
     * Primary/secondary identifier for vendor-specific radio technology.
     * The value format is determined by a vendor.
     *
     * The vendor identifiers have limited serialization capabilities - see
     * ProgramSelector description.
     */
    VENDOR_START = 1000,

    /** See VENDOR_START */
    VENDOR_END = 1999,

    INVALID = 0,

    /**
     * Primary identifier for analogue (without RDS) AM/FM stations:
     * frequency in kHz.
     *
     * This identifier also contains band information:
     *  - <500kHz: AM LW;
     *  - 500kHz - 1705kHz: AM MW;
     *  - 1.71MHz - 30MHz: AM SW;
     *  - >60MHz: FM.
     */
    AMFM_FREQUENCY,

    /**
     * 16bit primary identifier for FM RDS station.
     */
    RDS_PI,

    /**
     * 64bit compound primary identifier for HD Radio.
     *
     * Consists of (from the LSB):
     * - 32bit: Station ID number;
     * - 4bit: HD Radio subchannel;
     * - 18bit: AMFM_FREQUENCY.
     *
     * While station ID number should be unique globally, it sometimes get
     * abused by broadcasters (i.e. not being set at all). To ensure local
     * uniqueness, AMFM_FREQUENCY was added here. Global uniqueness is
     * a best-effort - see HD_STATION_NAME.
     *
     * HD Radio subchannel is a value in range 0-7.
     * This index is 0-based (where 0 is MPS and 1..7 are SPS),
     * as opposed to HD Radio standard (where it's 1-based).
     *
     * The remaining bits should be set to zeros when writing on the chip side
     * and ignored when read.
     */
    HD_STATION_ID_EXT,

    /**
     * 64bit additional identifier for HD Radio.
     *
     * Due to Station ID abuse, some HD_STATION_ID_EXT identifiers may be not
     * globally unique. To provide a best-effort solution, a short version of
     * station name may be carried as additional identifier and may be used
     * by the tuner hardware to double-check tuning.
     *
     * The name is limited to the first 8 A-Z0-9 characters (lowercase letters
     * must be converted to uppercase). Encoded in little-endian ASCII:
     * the first character of the name is the LSB.
     *
     * For example: "Abc" is encoded as 0x434241.
     */
    HD_STATION_NAME,

    /**
     * 28bit compound primary identifier for Digital Audio Broadcasting.
     *
     * Consists of (from the LSB):
     * - 16bit: SId;
     * - 8bit: ECC code;
     * - 4bit: SCIdS.
     *
     * SCIdS (Service Component Identifier within the Service) value
     * of 0 represents the main service, while 1 and above represents
     * secondary services.
     *
     * The remaining bits should be set to zeros when writing on the chip side
     * and ignored when read.
     */
    DAB_SID_EXT,

    /** 16bit */
    DAB_ENSEMBLE,

    /** 12bit */
    DAB_SCID,

    /** kHz (see AMFM_FREQUENCY) */
    DAB_FREQUENCY,

    /**
     * 24bit primary identifier for Digital Radio Mondiale.
     */
    DRMO_SERVICE_ID,

    /** kHz (see AMFM_FREQUENCY) */
    DRMO_FREQUENCY,

    /**
     * 32bit primary identifier for SiriusXM Satellite Radio.
     */
    SXM_SERVICE_ID = DRMO_FREQUENCY + 2,

    /** 0-999 range */
    SXM_CHANNEL,
};

/**
 * A single program identifier component, i.e. frequency or channel ID.
 */
struct ProgramIdentifier {
    /**
     * Maps to IdentifierType enum. The enum may be extended in future versions
     * of the HAL. Values out of the enum range must not be used when writing
     * and ignored when reading.
     */
    uint32_t type;

    /**
     * The uint64_t value field holds the value in format described in comments
     * for IdentifierType enum.
     */
    uint64_t value;
};

/**
 * A set of identifiers necessary to tune to a given station.
 *
 * This can hold a combination of various identifiers, like:
 * - AM/FM frequency,
 * - HD Radio subchannel,
 * - DAB service ID.
 *
 * The type of radio technology is determined by the primary identifier - if the
 * primary identifier is for DAB, the program is DAB. However, a program of a
 * specific radio technology may have additional secondary identifiers for other
 * technologies, i.e. a satellite program may have FM fallback frequency,
 * if a station broadcasts both via satellite and FM.
 *
 * The identifiers from VENDOR_START..VENDOR_END range have limited
 * serialization capabilities: they are serialized locally, but ignored by the
 * cloud services. If a program has primary id from vendor range, it's not
 * synchronized with other devices at all.
 */
struct ProgramSelector {
    /**
     * Primary program identifier.
     *
     * This identifier uniquely identifies a station and can be used for
     * equality check.
     *
     * It can hold only a subset of identifier types, one per each
     * radio technology:
     *  - analogue AM/FM: AMFM_FREQUENCY;
     *  - FM RDS: RDS_PI;
     *  - HD Radio: HD_STATION_ID_EXT;
     *  - DAB: DAB_SID_EXT;
     *  - Digital Radio Mondiale: DRMO_SERVICE_ID;
     *  - SiriusXM: SXM_SERVICE_ID;
     *  - vendor-specific: VENDOR_START..VENDOR_END.
     *
     * The list may change in future versions, so the implementation must obey,
     * but not rely on it.
     */
    ProgramIdentifier primaryId;

    /**
     * Secondary program identifiers.
     *
     * These identifiers are supplementary and can speed up tuning process,
     * but the primary ID must be sufficient (i.e. RDS PI is enough to select
     * a station from the list after a full band scan).
     *
     * Two selectors with different secondary IDs, but the same primary ID are
     * considered equal. In particular, secondary IDs vector may get updated for
     * an entry on the program list (ie. when a better frequency for a given
     * station is found).
     */
    vec<ProgramIdentifier> secondaryIds;
};

enum MetadataKey : int32_t {
    /** RDS PS (string) */
    RDS_PS = 1,

    /** RDS PTY (uint8_t) */
    RDS_PTY,

    /** RBDS PTY (uint8_t) */
    RBDS_PTY,

    /** RDS RT (string) */
    RDS_RT,

    /** Song title (string) */
    SONG_TITLE,

    /** Artist name (string) */
    SONG_ARTIST,

    /** Album name (string) */
    SONG_ALBUM,

    /** Station icon (uint32_t, see IBroadcastRadio::getImage) */
    STATION_ICON,

    /** Album art (uint32_t, see IBroadcastRadio::getImage) */
    ALBUM_ART,

    /**
     * Station name.
     *
     * This is a generic field to cover any radio technology.
     *
     * If the PROGRAM_NAME has the same content as DAB_*_NAME or RDS_PS,
     * it may not be present, to preserve space - framework must repopulate
     * it on the client side.
     */
    PROGRAM_NAME,

    /** DAB ensemble name (string) */
    DAB_ENSEMBLE_NAME,

    /**
     * DAB ensemble name abbreviated (string).
     *
     * The string must be up to 8 characters long.
     *
     * If the short variant is present, the long (DAB_ENSEMBLE_NAME) one must be
     * present as well.
     */
    DAB_ENSEMBLE_NAME_SHORT,

    /** DAB service name (string) */
    DAB_SERVICE_NAME,

    /** DAB service name abbreviated (see DAB_ENSEMBLE_NAME_SHORT) (string) */
    DAB_SERVICE_NAME_SHORT,

    /** DAB component name (string) */
    DAB_COMPONENT_NAME,

    /** DAB component name abbreviated (see DAB_ENSEMBLE_NAME_SHORT) (string) */
    DAB_COMPONENT_NAME_SHORT,
};

/**
 * An element of metadata vector.
 *
 * Contains one of the entries explained in MetadataKey.
 *
 * Depending on a type described in the comment for a specific key, either the
 * intValue or stringValue field must be populated.
 */
struct Metadata {
    /**
     * Maps to MetadataKey enum. The enum may be extended in future versions
     * of the HAL. Values out of the enum range must not be used when writing
     * and ignored when reading.
     */
    uint32_t key;

    int64_t intValue;
    string stringValue;
};

/**
 * An update packet of the program list.
 *
 * The order of entries in the vectors is unspecified.
 */
struct ProgramListChunk {
    /**
     * Treats all previously added entries as removed.
     *
     * This is meant to save binder transaction bandwidth on 'removed' vector
     * and provide a clear empty state.
     *
     * If set, 'removed' vector must be empty.
     *
     * The client may wait with taking action on this until it received the
     * chunk with complete flag set (to avoid part of stations temporarily
     * disappearing from the list).
     */
    bool purge;

    /**
     * If false, it means there are still programs not transmitted,
     * due for transmission in following updates.
     *
     * Used by UIs that wait for complete list instead of displaying
     * programs while scanning.
     *
     * After the whole channel range was scanned and all discovered programs
     * were transmitted, the last chunk must have set this flag to true.
     * This must happen within Constants::LIST_COMPLETE_TIMEOUT_MS from the
     * startProgramListUpdates call. If it doesn't, client may assume the tuner
     * came into a bad state and display error message.
     */
    bool complete;

    /**
     * Added or modified program list entries.
     *
     * Two entries with the same primaryId (ProgramSelector member)
     * are considered the same.
     */
    vec<ProgramInfo> modified;

    /**
     * Removed program list entries.
     *
     * Contains primaryId (ProgramSelector member) of a program to remove.
     */
    vec<ProgramIdentifier> removed;
};

/**
 * Large-grain filter to the program list.
 *
 * This is meant to reduce binder transaction bandwidth, not for fine-grained
 * filtering user might expect.
 *
 * The filter is designed as conjunctive normal form: the entry that passes the
 * filter must satisfy all the clauses (members of this struct). Vector clauses
 * are disjunctions of literals. In other words, there is AND between each
 * high-level group and OR inside it.
 */
struct ProgramFilter {
    /**
     * List of identifier types that satisfy the filter.
     *
     * If the program list entry contains at least one identifier of the type
     * listed, it satisfies this condition.
     *
     * Empty list means no filtering on identifier type.
     */
    vec<uint32_t> identifierTypes;

    /**
     * List of identifiers that satisfy the filter.
     *
     * If the program list entry contains at least one listed identifier,
     * it satisfies this condition.
     *
     * Empty list means no filtering on identifier.
     */
    vec<ProgramIdentifier> identifiers;

    /**
     * Includes non-tunable entries that define tree structure on the
     * program list (i.e. DAB ensembles).
     */
    bool includeCategories;

    /**
     * Disable updates on entry modifications.
     *
     * If true, 'modified' vector of ProgramListChunk must contain list
     * additions only. Once the program is added to the list, it's not
     * updated anymore.
     */
    bool excludeModifications;
};

/**
 * Type of an announcement.
 *
 * It maps to different announcement types per each radio technology.
 */
enum AnnouncementType : uint8_t {
    /** DAB alarm, RDS emergency program type (PTY 31). */
    EMERGENCY = 1,

    /** DAB warning. */
    WARNING,

    /** DAB road traffic, RDS TA, HD Radio transportation. */
    TRAFFIC,

    /** Weather. */
    WEATHER,

    /** News. */
    NEWS,

    /** DAB event, special event. */
    EVENT,

    /** DAB sport report, RDS sports. */
    SPORT,

    /** All others. */
    MISC,
};

/**
 * A pointer to a station broadcasting active announcement.
 */
struct Announcement {
    /**
     * Program selector to tune to the announcement.
     */
    ProgramSelector selector;

    /** Announcement type. */
    AnnouncementType type;

    /**
     * Vendor-specific information.
     *
     * It may be used for extra features, not supported by the platform,
     * for example: com.me.hdradio.urgency=100; com.me.hdradio.certainity=50.
     */
    vec<VendorKeyValue> vendorInfo;
};