mirror of
https://github.com/HenkKalkwater/harbour-sailfin.git
synced 2024-11-25 02:15:17 +00:00
Chris Josten
54235f298e
Besides MPRIS support, this also adds support for hasPrevious() and hasNext() in several parts to determine whether the player/playlist/shuffler has a previous or next item.
350 lines
15 KiB
XML
350 lines
15 KiB
XML
<?xml version="1.0" ?>
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<node name="/Track_List_Interface" xmlns:tp="http://telepathy.freedesktop.org/wiki/DbusSpec#extensions-v0">
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<interface name="org.mpris.MediaPlayer2.TrackList">
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<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
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<p>
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Provides access to a short list of tracks which were recently played or
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will be played shortly. This is intended to provide context to the
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currently-playing track, rather than giving complete access to the
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media player's playlist.
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</p>
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<p>
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Example use cases are the list of tracks from the same album as the
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currently playing song or the
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<a href="http://projects.gnome.org/rhythmbox/">Rhythmbox</a> play queue.
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</p>
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<p>
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Each track in the tracklist has a unique identifier.
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The intention is that this uniquely identifies the track within
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the scope of the tracklist. In particular, if a media item
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(a particular music file, say) occurs twice in the track list, each
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occurrence should have a different identifier. If a track is removed
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from the middle of the playlist, it should not affect the track ids
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of any other tracks in the tracklist.
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</p>
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<p>
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As a result, the traditional track identifiers of URLs and position
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in the playlist cannot be used. Any scheme which satisfies the
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uniqueness requirements is valid, as clients should not make any
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assumptions about the value of the track id beyond the fact
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that it is a unique identifier.
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</p>
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<p>
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Note that the (memory and processing) burden of implementing the
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TrackList interface and maintaining unique track ids for the
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playlist can be mitigated by only exposing a subset of the playlist when
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it is very long (the 20 or so tracks around the currently playing
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track, for example). This is a recommended practice as the tracklist
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interface is not designed to enable browsing through a large list of tracks,
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but rather to provide clients with context about the currently playing track.
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</p>
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</tp:docstring>
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<tp:mapping name="Metadata_Map" array-name="Metadata_Map_List">
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<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
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<p>A mapping from metadata attribute names to values.</p>
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<p>
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The <b>mpris:trackid</b> attribute must always be present, and must be
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of D-Bus type "o". This contains a D-Bus path that uniquely identifies
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the track within the scope of the playlist. There may or may not be
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an actual D-Bus object at that path; this specification says nothing
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about what interfaces such an object may implement.
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</p>
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<p>
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If the length of the track is known, it should be provided in the
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metadata property with the "mpris:length" key. The length must be
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given in microseconds, and be represented as a signed 64-bit integer.
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</p>
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<p>
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If there is an image associated with the track, a URL for it may be
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provided using the "mpris:artUrl" key. For other metadata, fields
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defined by the
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<a href="http://xesam.org/main/XesamOntology">Xesam ontology</a>
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should be used, prefixed by "xesam:". See the
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<a href="http://www.freedesktop.org/wiki/Specifications/mpris-spec/metadata">metadata page on the freedesktop.org wiki</a>
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for a list of common fields.
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</p>
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<p>
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Lists of strings should be passed using the array-of-string ("as")
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D-Bus type. Dates should be passed as strings using the ISO 8601
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extended format (eg: 2007-04-29T14:35:51). If the timezone is
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known, RFC 3339's internet profile should be used (eg:
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2007-04-29T14:35:51+02:00).
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</p>
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</tp:docstring>
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<tp:member type="s" name="Attribute">
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<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
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<p>
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The name of the attribute; see the
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<a href="http://www.freedesktop.org/wiki/Specifications/mpris-spec/metadata">metadata page</a>
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for guidelines on names to use.
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</p>
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</tp:docstring>
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</tp:member>
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<tp:member type="v" name="Value">
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<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
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<p>The value of the attribute, in the most appropriate format.</p>
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</tp:docstring>
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</tp:member>
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</tp:mapping>
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<tp:simple-type name="Uri" type="s">
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<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
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<p>A unique resource identifier.</p>
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</tp:docstring>
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</tp:simple-type>
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<method name="GetTracksMetadata" tp:name-for-bindings="Get_Tracks_Metadata">
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<arg direction="in" name="TrackIds" type="ao" tp:type="Track_Id[]">
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<tp:docstring>
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<p>The list of track ids for which metadata is requested.</p>
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</tp:docstring>
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</arg>
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<arg direction="out" type="aa{sv}" tp:type="Metadata_Map[]" name="Metadata">
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<tp:docstring>
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<p>Metadata of the set of tracks given as input.</p>
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<p>See the type documentation for more details.</p>
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</tp:docstring>
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</arg>
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<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
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<p>Gets all the metadata available for a set of tracks.</p>
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<p>
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Each set of metadata must have a "mpris:trackid" entry at the very least,
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which contains a string that uniquely identifies this track within
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the scope of the tracklist.
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</p>
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</tp:docstring>
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</method>
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<method name="AddTrack" tp:name-for-bindings="Add_Track">
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<arg direction="in" type="s" tp:type="Uri" name="Uri">
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<tp:docstring>
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<p>
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The uri of the item to add. Its uri scheme should be an element of the
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<strong>org.mpris.MediaPlayer2.SupportedUriSchemes</strong>
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property and the mime-type should match one of the elements of the
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<strong>org.mpris.MediaPlayer2.SupportedMimeTypes</strong>
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</p>
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</tp:docstring>
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</arg>
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<arg direction="in" type="o" tp:type="Track_Id" name="AfterTrack">
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<tp:docstring>
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<p>
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The identifier of the track after which
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the new item should be inserted. The path
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<literal>/org/mpris/MediaPlayer2/TrackList/NoTrack</literal>
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indicates that the track should be inserted at the
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start of the track list.
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</p>
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</tp:docstring>
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</arg>
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<arg direction="in" type="b" name="SetAsCurrent">
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<tp:docstring>
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<p>
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Whether the newly inserted track should be considered as
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the current track. Setting this to true has the same effect as
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calling GoTo afterwards.
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</p>
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</tp:docstring>
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</arg>
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<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
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<p>Adds a URI in the TrackList.</p>
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<p>
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If the <tp:member-ref>CanEditTracks</tp:member-ref> property is false,
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this has no effect.
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</p>
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<p>
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Note: Clients should not assume that the track has been added at the
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time when this method returns. They should wait for a TrackAdded (or
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TrackListReplaced) signal.
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</p>
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</tp:docstring>
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</method>
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<method name="RemoveTrack" tp:name-for-bindings="Remove__Track">
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<arg direction="in" type="o" tp:type="Track_Id" name="TrackId">
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<tp:docstring>
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<p>Identifier of the track to be removed.</p>
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<p>
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<literal>/org/mpris/MediaPlayer2/TrackList/NoTrack</literal>
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is <em>not</em> a valid value for this argument.
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</p>
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</tp:docstring>
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</arg>
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<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
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<p>Removes an item from the TrackList.</p>
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<p>If the track is not part of this tracklist, this has no effect.</p>
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<p>
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If the <tp:member-ref>CanEditTracks</tp:member-ref> property is false,
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this has no effect.
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</p>
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<p>
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Note: Clients should not assume that the track has been removed at the
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time when this method returns. They should wait for a TrackRemoved (or
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TrackListReplaced) signal.
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</p>
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</tp:docstring>
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</method>
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<method name="GoTo" tp:name-for-bindings="Go_To">
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<arg direction="in" type="o" tp:type="Track_Id" name="TrackId">
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<tp:docstring>
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<p>Identifier of the track to skip to.</p>
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<p>
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<literal>/org/mpris/MediaPlayer2/TrackList/NoTrack</literal>
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is <em>not</em> a valid value for this argument.
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</p>
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</tp:docstring>
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</arg>
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<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
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<p>Skip to the specified TrackId.</p>
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<p>If the track is not part of this tracklist, this has no effect.</p>
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<p>
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If this object is not <strong>/org/mpris/MediaPlayer2</strong>,
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the current TrackList's tracks should be replaced with the contents of
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this TrackList, and the TrackListReplaced signal should be fired from
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<strong>/org/mpris/MediaPlayer2</strong>.
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</p>
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</tp:docstring>
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</method>
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<property name="Tracks" type="ao" tp:type="Track_Id[]" tp:name-for-bindings="Tracks" access="read">
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<annotation name="org.freedesktop.DBus.Property.EmitsChangedSignal" value="invalidates"/>
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<tp:docstring>
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<p>
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An array which contains the identifier of each track
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in the tracklist, in order.
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</p>
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<p>
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The <literal>org.freedesktop.DBus.Properties.PropertiesChanged</literal>
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signal is emited every time this property changes, but the signal
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message does not contain the new value.
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Client implementations should rather rely on the
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<tp:member-ref>TrackAdded</tp:member-ref>,
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<tp:member-ref>TrackRemoved</tp:member-ref> and
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<tp:member-ref>TrackListReplaced</tp:member-ref> signals to keep their
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representation of the tracklist up to date.
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</p>
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</tp:docstring>
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</property>
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<property name="CanEditTracks" type="b" tp:name-for-bindings="Can_Edit_Tracks" access="read">
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<annotation name="org.freedesktop.DBus.Property.EmitsChangedSignal" value="true"/>
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<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
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<p>
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If <strong>false</strong>, calling
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<tp:member-ref>AddTrack</tp:member-ref> or
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<tp:member-ref>RemoveTrack</tp:member-ref> will have no effect,
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and may raise a NotSupported error.
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</p>
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</tp:docstring>
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</property>
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<signal name="TrackListReplaced" tp:name-for-bindings="Track_List_Replaced">
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<arg name="Tracks" type="ao" tp:type="Track_Id[]">
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<tp:docstring>
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<p>The new content of the tracklist.</p>
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</tp:docstring>
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</arg>
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<arg name="CurrentTrack" type="o" tp:type="Track_Id">
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<tp:docstring>
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<p>The identifier of the track to be considered as current.</p>
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<p>
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<literal>/org/mpris/MediaPlayer2/TrackList/NoTrack</literal>
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indicates that there is no current track.
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</p>
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<p>
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This should correspond to the <literal>mpris:trackid</literal> field of the
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Metadata property of the <literal>org.mpris.MediaPlayer2.Player</literal>
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interface.
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</p>
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</tp:docstring>
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</arg>
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<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
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<p>Indicates that the entire tracklist has been replaced.</p>
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<p>
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It is left up to the implementation to decide when
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a change to the track list is invasive enough that
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this signal should be emitted instead of a series of
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TrackAdded and TrackRemoved signals.
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</p>
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</tp:docstring>
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</signal>
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<signal name="TrackAdded" tp:name-for-bindings="Track_Added">
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<arg type="a{sv}" tp:type="Metadata_Map" name="Metadata">
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<tp:docstring>
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<p>The metadata of the newly added item.</p>
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<p>This must include a mpris:trackid entry.</p>
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<p>See the type documentation for more details.</p>
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</tp:docstring>
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</arg>
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<arg type="o" tp:type="Track_Id" name="AfterTrack">
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<tp:docstring>
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<p>
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The identifier of the track after which the new track
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was inserted. The path
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<literal>/org/mpris/MediaPlayer2/TrackList/NoTrack</literal>
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indicates that the track was inserted at the
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start of the track list.
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</p>
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</tp:docstring>
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</arg>
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<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
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<p>Indicates that a track has been added to the track list.</p>
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</tp:docstring>
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</signal>
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<signal name="TrackRemoved" tp:name-for-bindings="Track_Removed">
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<arg type="o" tp:type="Track_Id" name="TrackId">
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<tp:docstring>
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<p>The identifier of the track being removed.</p>
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<p>
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<literal>/org/mpris/MediaPlayer2/TrackList/NoTrack</literal>
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is <em>not</em> a valid value for this argument.
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</p>
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</tp:docstring>
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</arg>
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<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
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<p>Indicates that a track has been removed from the track list.</p>
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</tp:docstring>
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</signal>
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<signal name="TrackMetadataChanged" tp:name-for-bindings="Track_Metadata_Changed">
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<arg type="o" tp:type="Track_Id" name="TrackId">
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<tp:docstring>
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<p>The id of the track which metadata has changed.</p>
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<p>If the track id has changed, this will be the old value.</p>
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<p>
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<literal>/org/mpris/MediaPlayer2/TrackList/NoTrack</literal>
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is <em>not</em> a valid value for this argument.
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</p>
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</tp:docstring>
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</arg>
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<arg type="a{sv}" tp:type="Metadata_Map" name="Metadata">
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<tp:docstring>
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<p>The new track metadata.</p>
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<p>
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This must include a mpris:trackid entry. If the track id has
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changed, this will be the new value.
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</p>
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<p>See the type documentation for more details.</p>
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</tp:docstring>
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</arg>
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<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
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<p>
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Indicates that the metadata of a track in the tracklist has changed.
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</p>
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<p>
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This may indicate that a track has been replaced, in which case the
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mpris:trackid metadata entry is different from the TrackId argument.
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</p>
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</tp:docstring>
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</signal>
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</interface>
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</node>
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<!-- vim:set sw=2 sts=2 et ft=xml: -->
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