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If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. + diff --git a/Setup.hs b/Setup.hs new file mode 100644 --- /dev/null +++ b/Setup.hs @@ -0,0 +1,2 @@ +import Distribution.Simple +main = defaultMain diff --git a/mpris.cabal b/mpris.cabal new file mode 100644 --- /dev/null +++ b/mpris.cabal @@ -0,0 +1,51 @@ +-- Initial mpris.cabal generated by cabal init. For further documentation, +-- see http://haskell.org/cabal/users-guide/ + +name: mpris +version: 0.1.0.0 +synopsis: Interface for MPRIS +description: + This package implements the Media Player Remote Interfacing + Specification (MPRIS), a standard D-Bus interface which aims to + provide a common programmatic API for controlling media players. + . + The DBus specification consists of two main interfaces: + @org.mpris.MediaPlayer2@ and @org.mpris.MediaPlayer2.Player@ which + are implemented as modules "Mpris.MediaPlayer2" and + "Mpris.MediaPlayer2.Player". + . + The full specification can be found at: +homepage: http://github.com/Fuco1/mpris +license: GPL-3 +license-file: LICENSE +author: Matus Goljer +maintainer: matus.goljer@gmail.com +-- copyright: +category: Media +build-type: Simple +cabal-version: >=1.8 + +source-repository this + type: git + location: http://github.com/Fuco1/mpris + tag: 0.1.0.0 + +library + hs-source-dirs: + src + exposed-modules: + DBus.Mpris.Monad + DBus.Mpris.Utils + DBus.Mpris.MediaPlayer2 + DBus.Mpris.MediaPlayer2.Player + other-modules: + DBus.Mpris.Properties + DBus.Mpris.MediaPlayer2.Properties + DBus.Mpris.MediaPlayer2.Methods + DBus.Mpris.MediaPlayer2.Player.Properties + DBus.Mpris.MediaPlayer2.Player.Methods + build-depends: + base ==4.6.*, + dbus >= 0.10, + mtl >= 2.1.2, + containers >= 0.5 diff --git a/src/DBus/Mpris/MediaPlayer2.hs b/src/DBus/Mpris/MediaPlayer2.hs new file mode 100644 --- /dev/null +++ b/src/DBus/Mpris/MediaPlayer2.hs @@ -0,0 +1,12 @@ +{-# LANGUAGE OverloadedStrings #-} + +-- | Implements the org.mpris.MediaPlayer2 interface. +-- +-- More information at +module DBus.Mpris.MediaPlayer2 + ( module DBus.Mpris.MediaPlayer2.Methods + , module DBus.Mpris.MediaPlayer2.Properties + ) where + +import DBus.Mpris.MediaPlayer2.Methods +import DBus.Mpris.MediaPlayer2.Properties diff --git a/src/DBus/Mpris/MediaPlayer2/Methods.hs b/src/DBus/Mpris/MediaPlayer2/Methods.hs new file mode 100644 --- /dev/null +++ b/src/DBus/Mpris/MediaPlayer2/Methods.hs @@ -0,0 +1,25 @@ +{-# LANGUAGE OverloadedStrings #-} + +-- | Methods from the org.mpris.MediaPlayer2 interface +-- +-- More information at +module DBus.Mpris.MediaPlayer2.Methods + ( quit + , raise + ) where + +import DBus + +import DBus.Mpris.Monad +import DBus.Mpris.Utils (to) + +mprisCall :: MemberName -> MethodCall +mprisCall = methodCall "/org/mpris/MediaPlayer2" "org.mpris.MediaPlayer2" + +-- | Brings the media player's user interface to the front using any appropriate mechanism available. +raise :: BusName -> Mpris () +raise bus = call_ (mprisCall "Raise" `to` bus) + +-- | Cause the media player to stop running. +quit :: BusName -> Mpris () +quit bus = call_ (mprisCall "Quit" `to` bus) diff --git a/src/DBus/Mpris/MediaPlayer2/Player.hs b/src/DBus/Mpris/MediaPlayer2/Player.hs new file mode 100644 --- /dev/null +++ b/src/DBus/Mpris/MediaPlayer2/Player.hs @@ -0,0 +1,10 @@ +-- | Implements the org.mpris.MediaPlayer2.Player interface. +-- +-- More information at +module DBus.Mpris.MediaPlayer2.Player + ( module DBus.Mpris.MediaPlayer2.Player.Methods + , module DBus.Mpris.MediaPlayer2.Player.Properties + ) where + +import DBus.Mpris.MediaPlayer2.Player.Methods +import DBus.Mpris.MediaPlayer2.Player.Properties diff --git a/src/DBus/Mpris/MediaPlayer2/Player/Methods.hs b/src/DBus/Mpris/MediaPlayer2/Player/Methods.hs new file mode 100644 --- /dev/null +++ b/src/DBus/Mpris/MediaPlayer2/Player/Methods.hs @@ -0,0 +1,73 @@ +{-# LANGUAGE OverloadedStrings #-} + +-- | Implements the methods of org.mpris.MediaPlayer2.Player interface. +-- +-- More information at +module DBus.Mpris.MediaPlayer2.Player.Methods + ( next + , previous + , pause + , playPause + , stop + , play + , seek + , setPosition + , openUri + ) where + +import Data.Int +import DBus + +import DBus.Mpris.Monad +import DBus.Mpris.Utils + +mprisCall :: MemberName -> MethodCall +mprisCall = methodCall "/org/mpris/MediaPlayer2" "org.mpris.MediaPlayer2.Player" + +-- | Skips to the next track in the tracklist. +next :: BusName -> Mpris () +next bus = call_ $ mprisCall "Next" `to` bus + +-- | Skips to the previous track in the tracklist. +previous :: BusName -> Mpris () +previous bus = call_ $ mprisCall "Previous" `to` bus + +-- | Pauses playback. +pause :: BusName -> Mpris () +pause bus = call_ $ mprisCall "Pause" `to` bus + +-- | Pauses playback, if playback is already paused, resumes playback. +playPause :: BusName -> Mpris () +playPause bus = call_ $ mprisCall "PlayPause" `to` bus + +-- | Stops playback. +stop :: BusName -> Mpris () +stop bus = call_ $ mprisCall "Stop" `to` bus + +-- | Starts or resumes playback. +play :: BusName -> Mpris () +play bus = call_ $ mprisCall "Play" `to` bus + +-- | Seeks forward in the current track by the specified number of microseconds. +seek :: Integer -- ^ The number of microseconds to seek forward. + -> BusName -- ^ Bus + -> Mpris () +seek position bus = call_ $ (mprisCall "Seek") + { methodCallBody = [toVariant (fromIntegral position :: Int64)] } `to` bus + +-- | Sets the current track position in microseconds. +setPosition :: ObjectPath -- ^ The currently playing track's identifier. + -> Integer -- ^ Track position in microseconds. + -> BusName -- ^ Bus + -> Mpris () +setPosition object position bus = call_ $ (mprisCall "SetPosition") + { methodCallBody = [ toVariant (fromIntegral position :: Int64) + , toVariant object + ] } `to` bus + +-- | Opens the Uri given as an argument +openUri :: String -- ^ Uri of the track to load. + -> BusName -- ^ Bus + -> Mpris () +openUri uri bus = call_ $ (mprisCall "OpenUri") + { methodCallBody = [toVariant uri] } `to` bus diff --git a/src/DBus/Mpris/MediaPlayer2/Player/Properties.hs b/src/DBus/Mpris/MediaPlayer2/Player/Properties.hs new file mode 100644 --- /dev/null +++ b/src/DBus/Mpris/MediaPlayer2/Player/Properties.hs @@ -0,0 +1,121 @@ +{-# LANGUAGE OverloadedStrings #-} + +-- | Properties from the org.mpris.MediaPlayer2.Player interface +-- +-- All properties are currently read-only +-- +-- More information at +module DBus.Mpris.MediaPlayer2.Player.Properties + ( PlaybackStatus(..) + , playbackStatus + , LoopStatus(..) + , loopStatus + , rate + , shuffle + , metadata + , volume + , position + , minimumRate + , maximumRate + , canGoNext + , canGoPrevious + , canPlay + , canPause + , canSeek + , canControl + ) where + +import DBus +import Data.Map +import Data.Int (Int64) +import Control.Monad (liftM) + +import DBus.Mpris.Properties +import DBus.Mpris.Monad + +unpackIntM :: Mpris (Maybe Int64) -> Mpris (Maybe Integer) +unpackIntM = liftM . liftM $ fromIntegral + +readM :: Read a => Mpris (Maybe String) -> Mpris (Maybe a) +readM = liftM . liftM $ read + +property :: IsVariant a => String -> BusName -> Mpris (Maybe a) +property = getProperty "org.mpris.MediaPlayer2.Player" + +-- | A playback state. +data PlaybackStatus = Playing -- ^ A track is currently playing. + | Paused -- ^ A track is currently paused. + | Stopped -- ^ There is no track currently playing. + deriving (Show, Read) + +-- | The current playback status. +playbackStatus :: BusName -> Mpris (Maybe PlaybackStatus) +playbackStatus = readM . property "PlaybackStatus" + +-- | A repeat / loop status +data LoopStatus = None -- ^ The playback will stop when there are no more tracks to play + | Track -- ^ The current track will start again from the begining once it has finished playing + | Playlist -- ^ The playback loops through a list of tracks + deriving (Show, Read) + +-- | The current loop / repeat status +loopStatus :: BusName -> Mpris (Maybe LoopStatus) +loopStatus = readM . property "LoopStatus" + +-- | The current playback rate. +rate :: BusName -> Mpris (Maybe Double) +rate = property "Rate" + +-- | A value of 'False' indicates that playback is progressing +-- linearly through a playlist, while 'True' means playback is +-- progressing through a playlist in some other order. +shuffle :: BusName -> Mpris (Maybe Bool) +shuffle = property "Shuffle" + +-- | The metadata of the current element. +metadata :: BusName -> Mpris (Maybe (Map String Variant)) +metadata = property "Metadata" + +-- | The volume level. +volume :: BusName -> Mpris (Maybe Double) +volume = property "Volume" + +-- | The current track position in microseconds, between 0 and the +-- 'mpris:length' metadata entry (see Metadata). +position :: BusName -> Mpris (Maybe Integer) +position = unpackIntM . property "Position" + +-- | The minimum value which the Rate property can take. +minimumRate :: BusName -> Mpris (Maybe Double) +minimumRate = property "MinimumRate" + +-- | The maximum value which the Rate property can take. +maximumRate :: BusName -> Mpris (Maybe Double) +maximumRate = property "MaximumRate" + +-- | Whether the client can call the 'next' method on this interface and +-- expect the current track to change. +canGoNext :: BusName -> Mpris (Maybe Bool) +canGoNext = property "CanGoNext" + +-- | Whether the client can call the 'previous' method on this interface +-- and expect the current track to change. +canGoPrevious :: BusName -> Mpris (Maybe Bool) +canGoPrevious = property "CanGoPrevious" + +-- | Whether playback can be started using 'play' or 'playPause'. +canPlay :: BusName -> Mpris (Maybe Bool) +canPlay = property "CanPlay" + +-- | Whether playback can be paused using 'pause' or 'playPause. ' +canPause :: BusName -> Mpris (Maybe Bool) +canPause = property "CanPause" + +-- | Whether the client can control the playback position using 'seek' +-- and 'setPosition'. +canSeek :: BusName -> Mpris (Maybe Bool) +canSeek = property "CanSeek" + +-- | Whether the media player may be controlled over this interface. +canControl :: BusName -> Mpris (Maybe Bool) +canControl = property "CanControl" diff --git a/src/DBus/Mpris/MediaPlayer2/Properties.hs b/src/DBus/Mpris/MediaPlayer2/Properties.hs new file mode 100644 --- /dev/null +++ b/src/DBus/Mpris/MediaPlayer2/Properties.hs @@ -0,0 +1,50 @@ +{-# LANGUAGE OverloadedStrings #-} + +-- | Properties from the org.mpris.MediaPlayer2 interface +-- +-- More information at +module DBus.Mpris.MediaPlayer2.Properties + ( canQuit + , fullscreen + , identity + , canSetFullscreen + , canRaise + , hasTrackList + , desktopEntry + ) where + +import DBus + +import DBus.Mpris.Properties +import DBus.Mpris.Monad + +property :: IsVariant a => String -> BusName -> Mpris (Maybe a) +property = getProperty "org.mpris.MediaPlayer2" + +-- | Report if the player can quit. If 'False', calling 'quit' will have no effect. +canQuit :: BusName -> Mpris (Maybe Bool) +canQuit = property "CanQuit" + +-- | Whether the media player is occupying the fullscreen. +fullscreen :: BusName -> Mpris (Maybe Bool) +fullscreen = property "Fullscreen" + +-- | If 'False', attempting to set Fullscreen will have no effect. +canSetFullscreen :: BusName -> Mpris (Maybe Bool) +canSetFullscreen = property "CanSetFullscreen" + +-- | If 'False', calling 'raise' will have no effect. +canRaise :: BusName -> Mpris (Maybe Bool) +canRaise = property "CanRaise" + +-- | Indicates whether the /org/mpris/MediaPlayer2 object implements the org.mpris.MediaPlayer2.TrackList interface. +hasTrackList :: BusName -> Mpris (Maybe Bool) +hasTrackList = property "HasTrackList" + +-- | A friendly name to identify the media player to users. +identity :: BusName -> Mpris (Maybe String) +identity = property "Identity" + +-- | The basename of an installed .desktop file which complies with the Desktop entry specification, with the ".desktop" extension stripped. +desktopEntry :: BusName -> Mpris (Maybe String) +desktopEntry = property "DesktopEntry" diff --git a/src/DBus/Mpris/Monad.hs b/src/DBus/Mpris/Monad.hs new file mode 100644 --- /dev/null +++ b/src/DBus/Mpris/Monad.hs @@ -0,0 +1,77 @@ +{-# LANGUAGE OverloadedStrings #-} + +-- | Convenient monad for running MPRIS actions. +-- +-- It is a 'StateT' on top of 'IO' which handles the connection and +-- caches available players as 'BusName' s. +-- +-- It contains some useful functions to work with current player and +-- make MPRIS calls. +-- +-- For example, to pause the playback on current player, you can do +-- +-- > pauseCurrent :: Mpris () +-- > pauseCurrent = current >>= pause +-- +-- To evaluate a Mpris action use 'runMpris' which brings it back into 'IO', for example: +-- +-- > main :: IO () +-- > main = do +-- > let bus = busName_ "org.mpris.MediaPlayer2.mpd" +-- > runMpris $ pause bus +module DBus.Mpris.Monad + ( Mpris + , State(..) + , current + , call + , call_ + , runMpris + ) where + +import Control.Exception (bracket) +import Control.Monad (void) + +import Control.Monad.State hiding (State) + +import DBus +import qualified DBus.Client as D + +-- | Internal state. +-- +-- It holds the dbus 'client' which is used to make calls. +-- +-- The list of 'players' works as a LRU stack, when a player changes +-- it is removed from the list and placed on top. +data State = State { client :: D.Client -- ^ The dbus client used to make the calls + , players :: [BusName] -- ^ List of available players-capable players as bus names + } + +-- | Type wrapper for Mpris "monad". +type Mpris a = StateT State IO a + +-- | Extract current player from the 'State'. +currentPlayer :: State -> BusName +currentPlayer = head . players + +-- | Return current player +current :: Mpris BusName +current = gets currentPlayer + +-- | Call a method call in context of current dbus client. +call :: MethodCall -> Mpris (Either MethodError MethodReturn) +call method = do + client <- gets client + liftIO $ D.call client method + +-- | Like 'call' but ignores the result. +call_ :: MethodCall -> Mpris () +call_ = void . call + +-- | Run the 'Mpris' computation and return the result inside 'IO'. +runMpris :: Mpris a -> IO a +runMpris code = bracket + (do + client <- D.connectSession + return State { client = client, players = [busName_ "org.mpris.MediaPlayer2.mpd"] }) + (\(State {client = client}) -> D.disconnect client) + (evalStateT code) diff --git a/src/DBus/Mpris/Properties.hs b/src/DBus/Mpris/Properties.hs new file mode 100644 --- /dev/null +++ b/src/DBus/Mpris/Properties.hs @@ -0,0 +1,35 @@ +{-# LANGUAGE OverloadedStrings #-} + +-- | Utilities to work with dbus properties. +-- +-- A very simple api to org.freedesktop.DBus.Properties. +module DBus.Mpris.Properties + ( getProperty + ) where + +import DBus + +import DBus.Mpris.Monad +import DBus.Mpris.Utils + +-- | Construct a call to get value of property at interface +propertyCall :: String -- ^ Interface + -> String -- ^ Property name + -> MethodCall +propertyCall interface property = (methodCall "/org/mpris/MediaPlayer2" "org.freedesktop.DBus.Properties" "Get") + { methodCallBody = [toVariant interface, toVariant property] } + +-- | Get value of interface's property at bus +getProperty :: IsVariant a => + String -- ^ Interface + -> String -- ^ Property + -> BusName -- ^ Bus + -> Mpris (Maybe a) +getProperty interface prop bus = do + reply <- call $ propertyCall interface prop `to` bus + case reply of + Left _ -> return Nothing + Right r -> do + let body = methodReturnBody r + -- the bind here runs inside Maybe monad, neat! + return $ fromVariant (head body) >>= fromVariant diff --git a/src/DBus/Mpris/Utils.hs b/src/DBus/Mpris/Utils.hs new file mode 100644 --- /dev/null +++ b/src/DBus/Mpris/Utils.hs @@ -0,0 +1,14 @@ +-- | Utilities for work with dbus which are missing from the dbus +-- backage. +module DBus.Mpris.Utils + ( to + ) where + +import DBus + +-- | Send a method call to a specific bus. +-- +-- This just sets the 'methodCallDestination' property of 'MethodCall' +-- in a bit more convenient manner. +to :: MethodCall -> BusName -> MethodCall +method `to` bus = method { methodCallDestination = Just bus }