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Showing content from https://developers.google.com/cast/docs/reference/ios/interface_g_c_k_media_metadata below:

GCKMediaMetadata Class | Cast | Google for Developers

Skip to main content GCKMediaMetadata Class

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A container for media metadata.

Metadata has a media type, an optional list of images, and a collection of metadata fields. Keys for common metadata fields are predefined as constants, but the application is free to define and use additional fields of its own.

The values of the predefined fields have predefined types. For example, a track number is an NSInteger and a creation date is an NSString containing an ISO-8601 representation of a date and time. Attempting to store a value of an incorrect type in a field will raise an NSInvalidArgumentException.

Note that the Cast protocol limits which metadata fields can be used for a given media type. When a MediaMetadata object is serialized to JSON for delivery to a Cast receiver, any predefined fields which are not supported for a given media type will not be included in the serialized form, but any application-defined fields will always be included. The complete list of predefined fields is as follows:

Field Value Type Valid Metadata Types kGCKMetadataKeyCreationDate NSDate GCKMediaMetadataTypePhoto kGCKMetadataKeyReleaseDate NSDate GCKMediaMetadataTypeGeneric, GCKMediaMetadataTypeMovie, GCKMediaMetadataTypeTVShow, GCKMediaMetadataTypeMusicTrack kGCKMetadataKeyBroadcastDate NSDate GCKMediaMetadataTypeTVShow kGCKMetadataKeyTitle NSString GCKMediaMetadataTypeGeneric, GCKMediaMetadataTypeMovie, GCKMediaMetadataTypeTVShow, GCKMediaMetadataTypeMusicTrack, GCKMediaMetadataTypePhoto kGCKMetadataKeySubtitle NSString GCKMediaMetadataTypeGeneric, GCKMediaMetadataTypeMovie kGCKMetadataKeyArtist NSString GCKMediaMetadataTypeGeneric, GCKMediaMetadataTypeMusicTrack, GCKMediaMetadataTypePhoto kGCKMetadataKeyAlbumArtist NSString GCKMediaMetadataTypeMusicTrack kGCKMetadataKeyAlbumTitle NSString GCKMediaMetadataTypeMusicTrack kGCKMetadataKeyComposer NSString GCKMediaMetadataTypeMusicTrack kGCKMetadataKeyDiscNumber NSInteger GCKMediaMetadataTypeMusicTrack kGCKMetadataKeyTrackNumber NSInteger GCKMediaMetadataTypeMusicTrack kGCKMetadataKeySeasonNumber NSInteger GCKMediaMetadataTypeTVShow kGCKMetadataKeyEpisodeNumber NSInteger GCKMediaMetadataTypeTVShow kGCKMetadataKeySeriesTitle NSString GCKMediaMetadataTypeTVShow kGCKMetadataKeyStudio NSString GCKMediaMetadataTypeMovie kGCKMetadataKeyWidth NSInteger GCKMediaMetadataTypePhoto kGCKMetadataKeyHeight NSInteger GCKMediaMetadataTypePhoto kGCKMetadataKeyLocationName NSString GCKMediaMetadataTypePhoto kGCKMetadataKeyLocationLatitude double GCKMediaMetadataTypePhoto kGCKMetadataKeyLocationLongitude double GCKMediaMetadataTypePhoto

Inherits NSObject, <NSCopying>, and <NSSecureCoding>.

Initializes a new, empty, MediaMetadata with the given media type.

Designated initializer.

Parameters

Initialize with the generic metadata type.

- (void) removeAllMediaImages

Removes all the current images.

Adds an image to the list of images.

Parameters
- (BOOL) containsKey: (NSString *)  key

Tests if the object contains a field with the given key.

Parameters
Returns
YES if the field exists, NO otherwise.
- (NSArray<NSString *> *) allKeys

Returns a set of keys for all fields that are present in the object.

- (nullable id) objectForKey: (NSString *)  key

Reads the value of a field.

Parameters
key The key for the field.
Returns
The value of the field, or nil if the field has not been set.
- (void) setString: (NSString *)  value forKey: (NSString *)  key 

Stores a value in a string field.

Parameters
value The new value for the field. key The key for the field.
Exceptions
NSInvalidArgumentException if the key refers to a predefined field which is not a string field.
- (nullable NSString *) stringForKey: (NSString *)  key

Reads the value of a string field.

Parameters
key The key for the field.
Returns
The value of the field, or nil if the field has not been set.
Exceptions
NSInvalidArgumentException if the key refers to a predefined field which is not a string field.
- (void) setInteger: (NSInteger)  value forKey: (NSString *)  key 

Stores a value in an integer field.

Parameters
value The new value for the field. key The key for the field.
Exceptions
NSInvalidArgumentException if the key refers to a predefined field which is not an integer field.
- (NSInteger) integerForKey: (NSString *)  key

Reads the value of an integer field.

Parameters
key The key for the field.
Returns
The value of the field, or 0 if the field has not been set.
Exceptions
NSInvalidArgumentException if the key refers to a predefined field which is not an integer field.
- (NSInteger) integerForKey: (NSString *)  key defaultValue: (NSInteger)  defaultValue 

Reads the value of an integer field.

Parameters
key The key for the field. defaultValue The value to return if the field has not been set.
Returns
The value of the field, or the given default value if the field has not been set.
Exceptions
NSInvalidArgumentException if the key refers to a predefined field which is not an integer field.
- (void) setDouble: (double)  value forKey: (NSString *)  key 

Stores a value in a double field.

Parameters
value The new value for the field. key The key for the field.
Exceptions
NSInvalidArgumentException if the key refers to a predefined field which is not a double field.
- (double) doubleForKey: (NSString *)  key

Reads the value of a double field.

Parameters
key The key for the field.
Returns
The value of the field, or 0 if the field has not been set.
Exceptions
NSInvalidArgumentException if the key refers to a predefined field which is not a double field.
- (double) doubleForKey: (NSString *)  key defaultValue: (double)  defaultValue 

Reads the value of a double field.

Parameters
defaultValue The value to return if the field has not been set. key The key for the field.
Returns
The value of the field, or the given default value if the field has not been set.
Exceptions
NSInvalidArgumentException if the key refers to a predefined field which is not a double field.
- (void) setDate: (NSDate *)  date forKey: (NSString *)  key 

Stores a value in a date field as a restricted ISO-8601 representation of the date.

Parameters
date The new value for the field. key The key for the field.
Exceptions
NSInvalidArgumentException if the key refers to a predefined field which is not a date field.
- (nullable NSDate *) dateForKey: (NSString *)  key

Reads the value of a date field from the restricted ISO-8601 representation of the date.

Parameters
Returns
The date, or nil if this field has not been set.
Exceptions
NSInvalidArgumentException if the key refers to a predefined field which is not a date field.
- (nullable NSString *) dateAsStringForKey: (NSString *)  key

Reads the value of a date field, as a string.

Parameters
Returns
The date as a string containing the restricted ISO-8601 representation of the date, or nil if this field has not been set.
Exceptions
NSInvalidArgumentException if the key refers to a predefined field which is not a date field.
- (NSString* const) kGCKMetadataKeyCreationDate

String key: Creation date.

The value is the date and/or time at which the media was created, in ISO-8601 format. For example, this could be the date and time at which a photograph was taken or a piece of music was recorded.

- (NSString* const) kGCKMetadataKeyReleaseDate

String key: Release date.

The value is the date and/or time at which the media was released, in ISO-8601 format. For example, this could be the date that a movie or music album was released.

- (NSString* const) kGCKMetadataKeyBroadcastDate

String key: Broadcast date.

The value is the date and/or time at which the media was first broadcast, in ISO-8601 format. For example, this could be the date that a TV show episode was first aired.

- (NSString* const) kGCKMetadataKeyTitle

String key: Title.

The title of the media. For example, this could be the title of a song, movie, or TV show episode. This value is suitable for display purposes.

- (NSString* const) kGCKMetadataKeySubtitle

String key: Subtitle.

The subtitle of the media. This value is suitable for display purposes.

- (NSString* const) kGCKMetadataKeyArtist

String key: Artist.

The name of the artist who created the media. For example, this could be the name of a musician, performer, or photographer. This value is suitable for display purposes.

- (NSString* const) kGCKMetadataKeyAlbumArtist

String key: Album artist.

The name of the artist who produced an album. For example, in compilation albums such as DJ mixes, the album artist is not necessarily the same as the artist(s) of the individual songs on the album. This value is suitable for display purposes.

- (NSString* const) kGCKMetadataKeyAlbumTitle

String key: Album title.

The title of the album that a music track belongs to. This value is suitable for display purposes.

- (NSString* const) kGCKMetadataKeyComposer

String key: Composer.

The name of the composer of a music track. This value is suitable for display purposes.

- (NSString* const) kGCKMetadataKeyDiscNumber

Integer key: Disc number.

The disc number (counting from 1) that a music track belongs to in a multi-disc album.

- (NSString* const) kGCKMetadataKeyTrackNumber

Integer key: Track number.

The track number of a music track on an album disc. Typically track numbers are counted starting from 1, however this value may be 0 if it is a "hidden track" at the beginning of an album.

- (NSString* const) kGCKMetadataKeySeasonNumber

Integer key: Season number.

The season number that a TV show episode belongs to. Typically season numbers are counted starting from 1, however this value may be 0 if it is a "pilot" episode that predates the official start of a TV series.

- (NSString* const) kGCKMetadataKeyEpisodeNumber

Integer key: Episode number.

The number of an episode in a given season of a TV show. Typically episode numbers are counted starting from 1, however this value may be 0 if it is a "pilot" episode that is not considered to be an official episode of the first season.

- (NSString* const) kGCKMetadataKeySeriesTitle

String key: Series title.

The name of a series. For example, this could be the name of a TV show or series of related music albums. This value is suitable for display purposes.

- (NSString* const) kGCKMetadataKeyStudio

String key: Studio.

The name of a recording studio that produced a piece of media. For example, this could be the name of a movie studio or music label. This value is suitable for display purposes.

- (NSString* const) kGCKMetadataKeyWidth

Integer key: Width.

The width of a piece of media, in pixels. This would typically be used for providing the dimensions of a photograph.

- (NSString* const) kGCKMetadataKeyHeight

Integer key: Height.

The height of a piece of media, in pixels. This would typically be used for providing the dimensions of a photograph.

- (NSString* const) kGCKMetadataKeyLocationName

String key: Location name.

The name of a location where a piece of media was created. For example, this could be the location of a photograph or the principal filming location of a movie. This value is suitable for display purposes.

- (NSString* const) kGCKMetadataKeyLocationLatitude

Double key: Location latitude.

The latitude component of the geographical location where a piece of media was created. For example, this could be the location of a photograph or the principal filming location of a movie.

- (NSString* const) kGCKMetadataKeyLocationLongitude

Double key: Location longitude.

The longitude component of the geographical location where a piece of media was created. For example, this could be the location of a photograph or the principal filming location of a movie.

- (NSString* const) kGCKMetadataKeyBookTitle

String key: Book title.

The title of an audio book.

Since
4.3.5
- (NSString* const) kGCKMetadataKeyChapterNumber

Integer key: Chapter number.

The number of a chapter in an audio book.

Since
4.3.5
- (NSString* const) kGCKMetadataKeyChapterTitle

String key: Chapter title.

The title of a chapter in a audio book.

Since
4.3.5
- (NSString* const) kGCKMetadataKeySectionDuration

Double key: Section Duration.

The section duration in seconds. Used for queue metadata. For example, this could be a duration of one TV show in a queue, or a chapter duration of an audio book, or a program of a long live stream.

Since
4.4.1
- (NSString* const) kGCKMetadataKeySectionStartTimeInMedia

Double key: Section Start Time in Media.

The offset of section start time from the start of the media item in seconds. Used for queue metadata.

Since
4.4.1
- (NSString* const) kGCKMetadataKeySectionStartAbsoluteTime

Double key: Section Absolute Start Time.

The absolute time of section start, in epoch time in seconds. Used for queue metadata.

Since
4.4.1
- (NSString* const) kGCKMetadataKeySectionStartTimeInContainer

Double key: Section Start Time in Container.

The offset of section start time within the full container. Used for queue metadata.

Since
4.4.1
- (NSString* const) kGCKMetadataKeyQueueItemID

Double key: Queue Item ID.

The id of the queue item that includes the section start time. Used for queue metadata.

Since
4.4.1

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2024-09-18 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2024-09-18 UTC."],[[["`GCKMediaMetadata` stores media information like title, artist, album, and images for use with Google Cast."],["It supports predefined and custom metadata fields with specific data types (string, integer, double, date)."],["Developers can manage metadata using provided methods for adding, retrieving, and modifying values."],["The Cast protocol has limitations on supported fields, which are outlined in the documentation."],["Metadata type (movie, music, etc.) is crucial and dictates which fields are applicable."]]],[]]

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