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# Video decoder property list dictionary

Include a property list dictionary to describe a video decoder.

## Discussion

A MediaExtension video decoder needs to include an `EXAppExtensionAttributes` dictionary in its `Info.plist` file that contains the following keys and values:

- [`kMEVideoDecoderClassImplementationIDKey`](/documentation/MediaExtension/kMEVideoDecoderClassImplementationIDKey): The identifier for the decoder. Format similarly to the bundle identifier.
- `EXExtensionPointIdentifier`: The extension point name for video decoders. Set to the value for [`kMEVideoDecoderExtensionPointName`](/documentation/MediaExtension/kMEVideoDecoderExtensionPointName).
- `EXPrincipalClass`: The name of the video decoder factory class that conforms to the [`MEVideoDecoderExtension`](/documentation/MediaExtension/MEVideoDecoderExtension) protocol.
- [`kMEVideoDecoderObjectNameKey`](/documentation/MediaExtension/kMEVideoDecoderObjectNameKey): A user-readable string that describes the codec format. This string is used for uniquely identifying video decoders and possibly for debug logging but is typically not visible to users.
- [`kMEVideoDecoderCodecInfoKey`](/documentation/MediaExtension/kMEVideoDecoderCodecInfoKey): An array of one or more dictionaries describing the formats that the video decoder supports. Each dictionary must include the following keys:
  - [`kMEVideoDecoderCodecTypeKey`](/documentation/MediaExtension/kMEVideoDecoderCodecTypeKey): A string describing the four-character code of the codec associated with the video decoder. Each string should be exactly four characters long and use ASCII character set encoding.
  - [`kMEVideoDecoderCodecNameKey`](/documentation/MediaExtension/kMEVideoDecoderCodecNameKey): A user-readable string describing the name of the codec format. This string might be displayed as format information for the video track in a player application.

## Topics

### Property list keys

[`kMEVideoDecoderClassImplementationIDKey`](/documentation/MediaExtension/kMEVideoDecoderClassImplementationIDKey)

The unique identifier for the video decoder.

[`kMEVideoDecoderExtensionPointName`](/documentation/MediaExtension/kMEVideoDecoderExtensionPointName)

The extension point name for video decoders.

[`kMEVideoDecoderObjectNameKey`](/documentation/MediaExtension/kMEVideoDecoderObjectNameKey)

A user-readable string describing the decoder.

[`kMEVideoDecoderCodecInfoKey`](/documentation/MediaExtension/kMEVideoDecoderCodecInfoKey)

An array of one or more dictionaries describing the codecs that the decoder supports.

[`kMEVideoDecoderCodecTypeKey`](/documentation/MediaExtension/kMEVideoDecoderCodecTypeKey)

A string describing the four-character code of the codec that the decoder supports.

[`kMEVideoDecoderCodecNameKey`](/documentation/MediaExtension/kMEVideoDecoderCodecNameKey)

A user-readable string describing the name of the codec format.


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