bluez5_utils-5.62/doc/media-api.txt

BlueZ D-Bus Media API description
*********************************


Media hierarchy
===============

Service		org.bluez
Interface	org.bluez.Media1
Object path	[variable prefix]/{hci0,hci1,...}

Methods		void RegisterEndpoint(object endpoint, dict properties)

			Register a local end point to sender, the sender can
			register as many end points as it likes.

			Note: If the sender disconnects the end points are
			automatically unregistered.

			possible properties:

				string UUID:

					UUID of the profile which the endpoint
					is for.

				byte Codec:

					Assigned number of codec that the
					endpoint implements. The values should
					match the profile specification which
					is indicated by the UUID.

				array{byte} Capabilities:

					Capabilities blob, it is used as it is
					so the size and byte order must match.

			Possible Errors: org.bluez.Error.InvalidArguments
					 org.bluez.Error.NotSupported - emitted
					 when interface for the end-point is
					 disabled.

		void UnregisterEndpoint(object endpoint)

			Unregister sender end point.

		void RegisterPlayer(object player, dict properties)

			Register a media player object to sender, the sender
			can register as many objects as it likes.

			Object must implement at least
			org.mpris.MediaPlayer2.Player as defined in MPRIS 2.2
			spec:

			http://specifications.freedesktop.org/mpris-spec/latest/

			Note: If the sender disconnects its objects are
			automatically unregistered.

			Possible Errors: org.bluez.Error.InvalidArguments
					 org.bluez.Error.NotSupported

		void UnregisterPlayer(object player)

			Unregister sender media player.

		void RegisterApplication(object root, dict options)

			Register endpoints an player objects within root
			object which must implement ObjectManager.

			The application object path together with the D-Bus
			system bus connection ID define the identification of
			the application.

			Possible errors: org.bluez.Error.InvalidArguments
					 org.bluez.Error.AlreadyExists

		void UnregisterApplication(object application)

			This unregisters the services that has been
			previously registered. The object path parameter
			must match the same value that has been used
			on registration.

			Possible errors: org.bluez.Error.InvalidArguments
					 org.bluez.Error.DoesNotExist
Media Control hierarchy
=======================

Service		org.bluez
Interface	org.bluez.MediaControl1
Object path	[variable prefix]/{hci0,hci1,...}/dev_XX_XX_XX_XX_XX_XX

Methods		void Play() [Deprecated]

			Resume playback.

		void Pause() [Deprecated]

			Pause playback.

		void Stop() [Deprecated]

			Stop playback.

		void Next() [Deprecated]

			Next item.

		void Previous() [Deprecated]

			Previous item.

		void VolumeUp() [Deprecated]

			Adjust remote volume one step up

		void VolumeDown() [Deprecated]

			Adjust remote volume one step down

		void FastForward() [Deprecated]

			Fast forward playback, this action is only stopped
			when another method in this interface is called.

		void Rewind() [Deprecated]

			Rewind playback, this action is only stopped
			when another method in this interface is called.

Properties

		boolean Connected [readonly]

		object Player [readonly, optional]

			Addressed Player object path.


MediaPlayer1 hierarchy
======================

Service		org.bluez (Controller role)
Interface	org.bluez.MediaPlayer1
Object path	[variable prefix]/{hci0,hci1,...}/dev_XX_XX_XX_XX_XX_XX/playerX

Methods		void Play()

			Resume playback.

			Possible Errors: org.bluez.Error.NotSupported
					 org.bluez.Error.Failed

		void Pause()

			Pause playback.

			Possible Errors: org.bluez.Error.NotSupported
					 org.bluez.Error.Failed

		void Stop()

			Stop playback.

			Possible Errors: org.bluez.Error.NotSupported
					 org.bluez.Error.Failed

		void Next()

			Next item.

			Possible Errors: org.bluez.Error.NotSupported
					 org.bluez.Error.Failed

		void Previous()

			Previous item.

			Possible Errors: org.bluez.Error.NotSupported
					 org.bluez.Error.Failed

		void FastForward()

			Fast forward playback, this action is only stopped
			when another method in this interface is called.

			Possible Errors: org.bluez.Error.NotSupported
					 org.bluez.Error.Failed

		void Rewind()

			Rewind playback, this action is only stopped
			when another method in this interface is called.

			Possible Errors: org.bluez.Error.NotSupported
					 org.bluez.Error.Failed

		void Press(byte avc_key)

			Press a specific key to send as passthrough command.
			The key will be released automatically. Use Hold()
			instead if the intention is to hold down the key.

			Possible Errors: org.bluez.Error.InvalidArguments
					 org.bluez.Error.NotSupported
					 org.bluez.Error.Failed

		void Hold(byte avc_key)

			Press and hold a specific key to send as passthrough
			command. It is your responsibility to make sure that
			Release() is called after calling this method. The held
			key will also be released when any other method in this
			interface is called.

			Possible Errors: org.bluez.Error.InvalidArguments
					 org.bluez.Error.NotSupported
					 org.bluez.Error.Failed

		void Release()

			Release the previously held key invoked using Hold().

			Possible Errors: org.bluez.Error.NotSupported
					 org.bluez.Error.Failed

Properties	string Equalizer [readwrite]

			Possible values: "off" or "on"

		string Repeat [readwrite]

			Possible values: "off", "singletrack", "alltracks" or
					"group"

		string Shuffle [readwrite]

			Possible values: "off", "alltracks" or "group"

		string Scan [readwrite]

			Possible values: "off", "alltracks" or "group"

		string Status [readonly]

			Possible status: "playing", "stopped", "paused",
					"forward-seek", "reverse-seek"
					or "error"

		uint32 Position [readonly]

			Playback position in milliseconds. Changing the
			position may generate additional events that will be
			sent to the remote device. When position is 0 it means
			the track is starting and when it's greater than or
			equal to track's duration the track has ended. Note
			that even if duration is not available in metadata it's
			possible to signal its end by setting position to the
			maximum uint32 value.

		dict Track [readonly]

			Track metadata.

			Possible values:

				string Title:

					Track title name

				string Artist:

					Track artist name

				string Album:

					Track album name

				string Genre:

					Track genre name

				uint32 NumberOfTracks:

					Number of tracks in total

				uint32 TrackNumber:

					Track number

				uint32 Duration:

					Track duration in milliseconds

		object Device [readonly]

			Device object path.

		string Name [readonly]

			Player name

		string Type [readonly]

			Player type

			Possible values:

				"Audio"
				"Video"
				"Audio Broadcasting"
				"Video Broadcasting"

		string Subtype [readonly]

			Player subtype

			Possible values:

				"Audio Book"
				"Podcast"

		boolean Browsable [readonly]

			If present indicates the player can be browsed using
			MediaFolder interface.

			Possible values:

				True: Supported and active
				False: Supported but inactive

			Note: If supported but inactive clients can enable it
			by using MediaFolder interface but it might interfere
			in the playback of other players.


		boolean Searchable [readonly]

			If present indicates the player can be searched using
			MediaFolder interface.

			Possible values:

				True: Supported and active
				False: Supported but inactive

			Note: If supported but inactive clients can enable it
			by using MediaFolder interface but it might interfere
			in the playback of other players.

		object Playlist

			Playlist object path.

MediaFolder1 hierarchy
======================

Service		unique name (Target role)
		org.bluez (Controller role)
Interface	org.bluez.MediaFolder1
Object path	freely definable (Target role)
		[variable prefix]/{hci0,hci1,...}/dev_XX_XX_XX_XX_XX_XX/playerX
		(Controller role)

Methods		object Search(string value, dict filter)

			Return a folder object containing the search result.

			To list the items found use the folder object returned
			and pass to ChangeFolder.

			Possible Errors: org.bluez.Error.NotSupported
					 org.bluez.Error.Failed

		array{objects, properties} ListItems(dict filter)

			Return a list of items found

			Possible Errors: org.bluez.Error.InvalidArguments
					 org.bluez.Error.NotSupported
					 org.bluez.Error.Failed

		void ChangeFolder(object folder)

			Change current folder.

			Note: By changing folder the items of previous folder
			might be destroyed and have to be listed again, the
			exception is NowPlaying folder which should be always
			present while the player is active.

			Possible Errors: org.bluez.Error.InvalidArguments
					 org.bluez.Error.NotSupported
					 org.bluez.Error.Failed

Properties	uint32 NumberOfItems [readonly]

			Number of items in the folder

		string Name [readonly]

			Folder name:

			Possible values:
				"/Filesystem/...": Filesystem scope
				"/NowPlaying/...": NowPlaying scope

			Note: /NowPlaying folder might not be listed if player
			is stopped, folders created by Search are virtual so
			once another Search is perform or the folder is
			changed using ChangeFolder it will no longer be listed.

Filters		uint32 Start:

			Offset of the first item.

			Default value: 0

		uint32 End:

			Offset of the last item.

			Default value: NumbeOfItems

		array{string} Attributes

			Item properties that should be included in the list.

			Possible Values:

				"title", "artist", "album", "genre",
				"number-of-tracks", "number", "duration"

			Default Value: All

MediaItem1 hierarchy
====================

Service		unique name (Target role)
		org.bluez (Controller role)
Interface	org.bluez.MediaItem1
Object path	freely definable (Target role)
		[variable
		prefix]/{hci0,hci1,...}/dev_XX_XX_XX_XX_XX_XX/playerX/itemX
		(Controller role)

Methods		void Play()

			Play item

			Possible Errors: org.bluez.Error.NotSupported
					 org.bluez.Error.Failed

		void AddtoNowPlaying()

			Add item to now playing list

			Possible Errors: org.bluez.Error.NotSupported
					 org.bluez.Error.Failed

Properties	object Player [readonly]

			Player object path the item belongs to

		string Name [readonly]

			Item displayable name

		string Type [readonly]

			Item type

			Possible values: "video", "audio", "folder"

		string FolderType [readonly, optional]

			Folder type.

			Possible values: "mixed", "titles", "albums", "artists"

			Available if property Type is "Folder"

		boolean Playable [readonly, optional]

			Indicates if the item can be played

			Available if property Type is "folder"

		dict Metadata [readonly]

			Item metadata.

			Possible values:

				string Title

					Item title name

					Available if property Type is "audio"
					or "video"

				string Artist

					Item artist name

					Available if property Type is "audio"
					or "video"

				string Album

					Item album name

					Available if property Type is "audio"
					or "video"

				string Genre

					Item genre name

					Available if property Type is "audio"
					or "video"

				uint32 NumberOfTracks

					Item album number of tracks in total

					Available if property Type is "audio"
					or "video"

				uint32 Number

					Item album number

					Available if property Type is "audio"
					or "video"

				uint32 Duration

					Item duration in milliseconds

					Available if property Type is "audio"
					or "video"

MediaEndpoint1 hierarchy
========================

Service		unique name (Server role)
		org.bluez (Client role)
Interface	org.bluez.MediaEndpoint1
Object path	freely definable (Server role)
		[variable prefix]/{hci0,hci1,...}/dev_XX_XX_XX_XX_XX_XX/sepX
		(Client role)

Methods		void SetConfiguration(object transport, dict properties)

			Set configuration for the transport.

			For client role transport must be set with a server
			endpoint oject which will be configured and the
			properties must contain the following properties:

				array{byte} Capabilities

		array{byte} SelectConfiguration(array{byte} capabilities)

			Select preferable configuration from the supported
			capabilities.

			Returns a configuration which can be used to setup
			a transport.

			Note: There is no need to cache the selected
			configuration since on success the configuration is
			send back as parameter of SetConfiguration.

		void ClearConfiguration(object transport)

			Clear transport configuration.

		void Release()

			This method gets called when the service daemon
			unregisters the endpoint. An endpoint can use it to do
			cleanup tasks. There is no need to unregister the
			endpoint, because when this method gets called it has
			already been unregistered.

Properties	string UUID [readonly, optional]:

			UUID of the profile which the endpoint is for.

		byte Codec [readonly, optional]:

			Assigned number of codec that the endpoint implements.
			The values should match the profile specification which
			is indicated by the UUID.

		array{byte} Capabilities [readonly, optional]:

			Capabilities blob, it is used as it is so the size and
			byte order must match.

		object Device [readonly, optional]:

			Device object which the endpoint is belongs to.

		bool DelayReporting [readonly, optional]:

			Indicates if endpoint supports Delay Reporting.

MediaTransport1 hierarchy
=========================

Service		org.bluez
Interface	org.bluez.MediaTransport1
Object path	[variable prefix]/{hci0,hci1,...}/dev_XX_XX_XX_XX_XX_XX/fdX

Methods		fd, uint16, uint16 Acquire()

			Acquire transport file descriptor and the MTU for read
			and write respectively.

			Possible Errors: org.bluez.Error.NotAuthorized
					 org.bluez.Error.Failed

		fd, uint16, uint16 TryAcquire()

			Acquire transport file descriptor only if the transport
			is in "pending" state at the time the message is
			received by BlueZ. Otherwise no request will be sent
			to the remote device and the function will just fail
			with org.bluez.Error.NotAvailable.

			Possible Errors: org.bluez.Error.NotAuthorized
					 org.bluez.Error.Failed
					 org.bluez.Error.NotAvailable

		void Release()

			Releases file descriptor.

Properties	object Device [readonly]

			Device object which the transport is connected to.

		string UUID [readonly]

			UUID of the profile which the transport is for.

		byte Codec [readonly]

			Assigned number of codec that the transport support.
			The values should match the profile specification which
			is indicated by the UUID.

		array{byte} Configuration [readonly]

			Configuration blob, it is used as it is so the size and
			byte order must match.

		string State [readonly]

			Indicates the state of the transport. Possible
			values are:
				"idle": not streaming
				"pending": streaming but not acquired
				"active": streaming and acquired

		uint16 Delay [readwrite]

			Optional. Transport delay in 1/10 of millisecond, this
			property is only writeable when the transport was
			acquired by the sender.

		uint16 Volume [readwrite]

			Optional. Indicates volume level of the transport,
			this property is only writeable when the transport was
			acquired by the sender.

			Possible Values: 0-127

		object Endpoint [readonly, optional, experimental]

			Endpoint object which the transport is associated
			with.