548 lines
17 KiB
Python
548 lines
17 KiB
Python
import logging
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import random
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import urlparse
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from . import listener
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logger = logging.getLogger('mopidy.core')
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def option_wrapper(name, default):
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def get_option(self):
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return getattr(self, name, default)
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def set_option(self, value):
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if getattr(self, name, default) != value:
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# pylint: disable = W0212
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self._trigger_options_changed()
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# pylint: enable = W0212
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return setattr(self, name, value)
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return property(get_option, set_option)
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class PlaybackState(object):
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"""
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Enum of playback states.
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"""
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#: Constant representing the paused state.
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PAUSED = u'paused'
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#: Constant representing the playing state.
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PLAYING = u'playing'
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#: Constant representing the stopped state.
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STOPPED = u'stopped'
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class PlaybackController(object):
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# pylint: disable = R0902
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# Too many instance attributes
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pykka_traversable = True
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#: :class:`True`
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#: Tracks are removed from the playlist when they have been played.
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#: :class:`False`
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#: Tracks are not removed from the playlist.
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consume = option_wrapper('_consume', False)
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#: The currently playing or selected track.
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#:
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#: A two-tuple of (CPID integer, :class:`mopidy.models.Track`) or
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#: :class:`None`.
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current_cp_track = None
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#: :class:`True`
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#: Tracks are selected at random from the playlist.
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#: :class:`False`
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#: Tracks are played in the order of the playlist.
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random = option_wrapper('_random', False)
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#: :class:`True`
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#: The current playlist is played repeatedly. To repeat a single track,
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#: select both :attr:`repeat` and :attr:`single`.
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#: :class:`False`
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#: The current playlist is played once.
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repeat = option_wrapper('_repeat', False)
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#: :class:`True`
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#: Playback is stopped after current song, unless in :attr:`repeat`
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#: mode.
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#: :class:`False`
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#: Playback continues after current song.
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single = option_wrapper('_single', False)
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def __init__(self, audio, backends, core):
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self.audio = audio
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self.backends = backends
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uri_schemes_by_backend = {
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backend: backend.uri_schemes.get()
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for backend in backends}
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self.backends_by_uri_scheme = {
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uri_scheme: backend
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for backend, uri_schemes in uri_schemes_by_backend.items()
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for uri_scheme in uri_schemes}
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self.core = core
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self._state = PlaybackState.STOPPED
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self._shuffled = []
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self._first_shuffle = True
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self._volume = None
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def _get_backend(self):
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if self.current_cp_track is None:
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return None
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uri = self.current_cp_track.track.uri
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uri_scheme = urlparse.urlparse(uri).scheme
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return self.backends_by_uri_scheme[uri_scheme]
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def _get_cpid(self, cp_track):
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if cp_track is None:
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return None
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return cp_track.cpid
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def _get_track(self, cp_track):
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if cp_track is None:
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return None
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return cp_track.track
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@property
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def current_cpid(self):
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"""
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The CPID (current playlist ID) of the currently playing or selected
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track.
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Read-only. Extracted from :attr:`current_cp_track` for convenience.
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"""
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return self._get_cpid(self.current_cp_track)
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@property
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def current_track(self):
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"""
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The currently playing or selected :class:`mopidy.models.Track`.
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Read-only. Extracted from :attr:`current_cp_track` for convenience.
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"""
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return self._get_track(self.current_cp_track)
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@property
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def current_playlist_position(self):
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"""
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The position of the current track in the current playlist.
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Read-only.
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"""
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if self.current_cp_track is None:
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return None
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try:
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return self.core.current_playlist.cp_tracks.index(
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self.current_cp_track)
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except ValueError:
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return None
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@property
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def track_at_eot(self):
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"""
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The track that will be played at the end of the current track.
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Read-only. A :class:`mopidy.models.Track` extracted from
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:attr:`cp_track_at_eot` for convenience.
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"""
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return self._get_track(self.cp_track_at_eot)
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@property
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def cp_track_at_eot(self):
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"""
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The track that will be played at the end of the current track.
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Read-only. A two-tuple of (CPID integer, :class:`mopidy.models.Track`).
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Not necessarily the same track as :attr:`cp_track_at_next`.
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"""
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# pylint: disable = R0911
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# Too many return statements
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cp_tracks = self.core.current_playlist.cp_tracks
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if not cp_tracks:
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return None
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if self.random and not self._shuffled:
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if self.repeat or self._first_shuffle:
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logger.debug('Shuffling tracks')
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self._shuffled = cp_tracks
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random.shuffle(self._shuffled)
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self._first_shuffle = False
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if self.random and self._shuffled:
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return self._shuffled[0]
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if self.current_cp_track is None:
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return cp_tracks[0]
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if self.repeat and self.single:
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return cp_tracks[self.current_playlist_position]
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if self.repeat and not self.single:
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return cp_tracks[
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(self.current_playlist_position + 1) % len(cp_tracks)]
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try:
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return cp_tracks[self.current_playlist_position + 1]
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except IndexError:
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return None
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@property
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def track_at_next(self):
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"""
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The track that will be played if calling :meth:`next()`.
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Read-only. A :class:`mopidy.models.Track` extracted from
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:attr:`cp_track_at_next` for convenience.
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"""
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return self._get_track(self.cp_track_at_next)
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@property
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def cp_track_at_next(self):
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"""
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The track that will be played if calling :meth:`next()`.
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Read-only. A two-tuple of (CPID integer, :class:`mopidy.models.Track`).
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For normal playback this is the next track in the playlist. If repeat
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is enabled the next track can loop around the playlist. When random is
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enabled this should be a random track, all tracks should be played once
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before the list repeats.
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"""
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cp_tracks = self.core.current_playlist.cp_tracks
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if not cp_tracks:
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return None
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if self.random and not self._shuffled:
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if self.repeat or self._first_shuffle:
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logger.debug('Shuffling tracks')
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self._shuffled = cp_tracks
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random.shuffle(self._shuffled)
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self._first_shuffle = False
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if self.random and self._shuffled:
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return self._shuffled[0]
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if self.current_cp_track is None:
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return cp_tracks[0]
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if self.repeat:
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return cp_tracks[
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(self.current_playlist_position + 1) % len(cp_tracks)]
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try:
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return cp_tracks[self.current_playlist_position + 1]
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except IndexError:
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return None
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@property
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def track_at_previous(self):
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"""
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The track that will be played if calling :meth:`previous()`.
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Read-only. A :class:`mopidy.models.Track` extracted from
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:attr:`cp_track_at_previous` for convenience.
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"""
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return self._get_track(self.cp_track_at_previous)
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@property
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def cp_track_at_previous(self):
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"""
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The track that will be played if calling :meth:`previous()`.
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A two-tuple of (CPID integer, :class:`mopidy.models.Track`).
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For normal playback this is the previous track in the playlist. If
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random and/or consume is enabled it should return the current track
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instead.
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"""
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if self.repeat or self.consume or self.random:
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return self.current_cp_track
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if self.current_playlist_position in (None, 0):
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return None
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return self.core.current_playlist.cp_tracks[
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self.current_playlist_position - 1]
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@property
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def state(self):
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"""
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The playback state. Must be :attr:`PLAYING`, :attr:`PAUSED`, or
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:attr:`STOPPED`.
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Possible states and transitions:
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.. digraph:: state_transitions
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"STOPPED" -> "PLAYING" [ label="play" ]
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"STOPPED" -> "PAUSED" [ label="pause" ]
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"PLAYING" -> "STOPPED" [ label="stop" ]
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"PLAYING" -> "PAUSED" [ label="pause" ]
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"PLAYING" -> "PLAYING" [ label="play" ]
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"PAUSED" -> "PLAYING" [ label="resume" ]
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"PAUSED" -> "STOPPED" [ label="stop" ]
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"""
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return self._state
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@state.setter # noqa
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def state(self, new_state):
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(old_state, self._state) = (self.state, new_state)
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logger.debug(u'Changing state: %s -> %s', old_state, new_state)
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self._trigger_playback_state_changed(old_state, new_state)
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@property
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def time_position(self):
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"""Time position in milliseconds."""
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backend = self._get_backend()
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if backend is None:
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return 0
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return backend.playback.get_time_position().get()
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@property
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def volume(self):
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"""Volume as int in range [0..100] or :class:`None`"""
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if self.audio:
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return self.audio.get_volume().get()
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else:
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# For testing
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return self._volume
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@volume.setter # noqa
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def volume(self, volume):
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if self.audio:
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self.audio.set_volume(volume)
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else:
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# For testing
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self._volume = volume
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def change_track(self, cp_track, on_error_step=1):
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"""
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Change to the given track, keeping the current playback state.
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:param cp_track: track to change to
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:type cp_track: two-tuple (CPID integer, :class:`mopidy.models.Track`)
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or :class:`None`
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:param on_error_step: direction to step at play error, 1 for next
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track (default), -1 for previous track
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:type on_error_step: int, -1 or 1
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"""
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old_state = self.state
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self.stop()
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self.current_cp_track = cp_track
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if old_state == PlaybackState.PLAYING:
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self.play(on_error_step=on_error_step)
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elif old_state == PlaybackState.PAUSED:
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self.pause()
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def on_end_of_track(self):
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"""
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Tell the playback controller that end of track is reached.
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"""
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if self.state == PlaybackState.STOPPED:
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return
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original_cp_track = self.current_cp_track
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if self.cp_track_at_eot:
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self._trigger_track_playback_ended()
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self.play(self.cp_track_at_eot)
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else:
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self.stop(clear_current_track=True)
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if self.consume:
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self.core.current_playlist.remove(cpid=original_cp_track.cpid)
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def on_current_playlist_change(self):
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"""
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Tell the playback controller that the current playlist has changed.
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Used by :class:`mopidy.core.CurrentPlaylistController`.
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"""
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self._first_shuffle = True
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self._shuffled = []
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if (not self.core.current_playlist.cp_tracks or
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self.current_cp_track not in
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self.core.current_playlist.cp_tracks):
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self.stop(clear_current_track=True)
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def next(self):
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"""
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Change to the next track.
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The current playback state will be kept. If it was playing, playing
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will continue. If it was paused, it will still be paused, etc.
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"""
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if self.cp_track_at_next:
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self._trigger_track_playback_ended()
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self.change_track(self.cp_track_at_next)
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else:
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self.stop(clear_current_track=True)
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def pause(self):
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"""Pause playback."""
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backend = self._get_backend()
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if backend is None or backend.playback.pause().get():
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self.state = PlaybackState.PAUSED
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self._trigger_track_playback_paused()
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def play(self, cp_track=None, on_error_step=1):
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"""
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Play the given track, or if the given track is :class:`None`, play the
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currently active track.
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:param cp_track: track to play
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:type cp_track: two-tuple (CPID integer, :class:`mopidy.models.Track`)
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or :class:`None`
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:param on_error_step: direction to step at play error, 1 for next
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track (default), -1 for previous track
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:type on_error_step: int, -1 or 1
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"""
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if cp_track is not None:
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assert cp_track in self.core.current_playlist.cp_tracks
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elif cp_track is None:
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if self.state == PlaybackState.PAUSED:
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return self.resume()
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elif self.current_cp_track is not None:
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cp_track = self.current_cp_track
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elif self.current_cp_track is None and on_error_step == 1:
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cp_track = self.cp_track_at_next
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elif self.current_cp_track is None and on_error_step == -1:
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cp_track = self.cp_track_at_previous
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if cp_track is not None:
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self.current_cp_track = cp_track
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self.state = PlaybackState.PLAYING
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if not self._get_backend().playback.play(cp_track.track).get():
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# Track is not playable
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if self.random and self._shuffled:
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self._shuffled.remove(cp_track)
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if on_error_step == 1:
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self.next()
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elif on_error_step == -1:
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self.previous()
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if self.random and self.current_cp_track in self._shuffled:
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self._shuffled.remove(self.current_cp_track)
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self._trigger_track_playback_started()
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def previous(self):
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"""
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Change to the previous track.
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The current playback state will be kept. If it was playing, playing
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will continue. If it was paused, it will still be paused, etc.
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"""
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self._trigger_track_playback_ended()
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self.change_track(self.cp_track_at_previous, on_error_step=-1)
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def resume(self):
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"""If paused, resume playing the current track."""
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if (self.state == PlaybackState.PAUSED and
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self._get_backend().playback.resume().get()):
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self.state = PlaybackState.PLAYING
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self._trigger_track_playback_resumed()
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def seek(self, time_position):
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"""
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Seeks to time position given in milliseconds.
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:param time_position: time position in milliseconds
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:type time_position: int
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:rtype: :class:`True` if successful, else :class:`False`
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"""
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if not self.core.current_playlist.tracks:
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return False
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if self.state == PlaybackState.STOPPED:
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self.play()
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elif self.state == PlaybackState.PAUSED:
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self.resume()
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if time_position < 0:
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time_position = 0
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elif time_position > self.current_track.length:
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self.next()
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return True
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success = self._get_backend().playback.seek(time_position).get()
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if success:
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self._trigger_seeked(time_position)
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return success
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def stop(self, clear_current_track=False):
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"""
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Stop playing.
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:param clear_current_track: whether to clear the current track _after_
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stopping
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:type clear_current_track: boolean
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"""
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if self.state != PlaybackState.STOPPED:
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if self._get_backend().playback.stop().get():
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self._trigger_track_playback_ended()
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self.state = PlaybackState.STOPPED
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if clear_current_track:
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self.current_cp_track = None
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def _trigger_track_playback_paused(self):
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logger.debug(u'Triggering track playback paused event')
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if self.current_track is None:
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return
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listener.CoreListener.send(
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'track_playback_paused',
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track=self.current_track, time_position=self.time_position)
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def _trigger_track_playback_resumed(self):
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logger.debug(u'Triggering track playback resumed event')
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if self.current_track is None:
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return
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listener.CoreListener.send(
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'track_playback_resumed',
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track=self.current_track, time_position=self.time_position)
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def _trigger_track_playback_started(self):
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logger.debug(u'Triggering track playback started event')
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if self.current_track is None:
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return
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listener.CoreListener.send(
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'track_playback_started', track=self.current_track)
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def _trigger_track_playback_ended(self):
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logger.debug(u'Triggering track playback ended event')
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if self.current_track is None:
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return
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listener.CoreListener.send(
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'track_playback_ended',
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track=self.current_track, time_position=self.time_position)
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def _trigger_playback_state_changed(self, old_state, new_state):
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logger.debug(u'Triggering playback state change event')
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listener.CoreListener.send(
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'playback_state_changed',
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old_state=old_state, new_state=new_state)
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def _trigger_options_changed(self):
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logger.debug(u'Triggering options changed event')
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listener.CoreListener.send('options_changed')
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def _trigger_seeked(self, time_position):
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logger.debug(u'Triggering seeked event')
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listener.CoreListener.send('seeked', time_position=time_position)
|