2007-03-28  Jonathan Matthew  <jonathan@kaolin.wh9.net>

        * backends/rb-player.c: (rb_player_interface_init),
        (rb_player_open), (rb_player_close), (rb_player_play),
        (rb_player_set_replaygain), (rb_player_multiple_open),
        (rb_player_new), (_rb_player_emit_eos), (_rb_player_emit_info),
        (_rb_player_emit_buffering), (_rb_player_emit_error),
        (_rb_player_emit_tick), (_rb_player_emit_event),
        (_rb_player_emit_playing_stream):
        * backends/rb-player.h:
        * bindings/python/rb.defs:
        * lib/rb-marshal.list:
        Additions to the RBPlayer interface to support gapless and crossfading
        playback.  The caller now associates data with each stream it opens,
        which is passed back through signals.  If the backend supports it, the
        caller can open multiple streams at the same time, allowing the next
        stream to be prepared before the current stream ends.  rb_player_play
        now has a parameter that specifies what should happen to the existing
        playing stream.  The 'playing-stream' signal is emitted when the
        playing stream actually changes, so the caller doesn't have to assume
        that rb_player_play takes effect immediately.

        * shell/rb-shell-player.c: (rb_shell_player_constructor),
        (rb_shell_player_get_crossfade),
        (rb_shell_player_open_playlist_url),
        (rb_shell_player_handle_eos_unlocked),
        (rb_shell_player_handle_eos), (rb_shell_player_init),
        (open_location_thread), (rb_shell_player_open_location),
        (rb_shell_player_play), (do_next_idle),
        (rb_shell_player_set_playing_entry), (rb_shell_player_do_previous),
        (rb_shell_player_do_next_internal), (rb_shell_player_do_next),
        (rb_shell_player_play_entry), (rb_shell_player_playpause),
        (rb_shell_player_sync_replaygain),
        (rb_shell_player_entry_activated_cb),
        (rb_shell_player_property_row_activated_cb),
        (rb_shell_player_set_playing_source_internal),
        (rb_shell_player_stop), (new_playing_stream_idle_cb),
        (current_playing_stream_idle_cb), (playing_stream_cb), (error_cb),
        (tick_cb), (gconf_track_transition_time_changed),
        (gconf_track_transition_album_check_changed),
        (gconf_network_buffer_size_changed):
        Use the RhythmDBEntry as the data associated with RBPlayer streams.
        Add various checks to ignore signals from RBPlayer that don't
        correspond to the stream we think is playing.

        Update the UI when the player emits the playing-stream signal, rather
        than hoping that rb_player_play works immediately.

        Read preferences for crossfading and network buffer size from gconf.
        Provide an option to disable crossfading between tracks on the same
        album (for DJ mix/live concert cases).

        In the player tick signal handler, start crossfading or prepare for
        gapless playback when the playing stream gets within a few seconds of
        the end.  Treat this as EOS (and therefore update play statistics
        etc.) and ignore the real EOS when it arrives.

        * shell/rb-shell.c: (rb_shell_finalize),
        (rb_shell_construct_notify_titles):
        Nothing very important

        * sources/rb-streaming-source.c: (buffering_cb):
        * plugins/iradio/rb-iradio-source.c: (info_available_cb):
        Minor updates for RBPlayer interface changes

        * backends/gstreamer/Makefile.am:
        * backends/gstreamer/rb-player-gst.c: (rb_player_init),
        (tick_timeout), (emit_signal_idle), (rb_player_gst_bus_cb):
        Update the existing player backend for the RBPlayer interface changes.

        * shell/Makefile.am:
        * backends/gstreamer/rb-player-gst-xfade.c:
        * backends/gstreamer/rb-player-gst-xfade.h:
        New player backend implementing crossfading and gapless playback.

        * plugins/visualizer/rb-visualizer-plugin.c:
        (create_visualizer_element), (update_playbin_visualizer),
        (update_tee_visualizer), (update_visualizer), (impl_activate):
        Use the RBPlayerGstTee interface to implement visualization for the
        new player backend; somewhat shaky at the moment.

        * plugins/audiocd/Makefile.am:
        * plugins/audiocd/rb-audiocd-plugin.c:
        (rb_audiocd_plugin_can_reuse_stream_cb),
        (rb_audiocd_plugin_reuse_stream_cb), (impl_activate):
        Use the new player backend's can-reuse-stream and reuse-stream signals
        to skip between tracks on audio CDs rather than closing and reopening
        the device (or attempting to crossfade between tracks..)

        * data/glade/playback-prefs.glade:
        * data/rhythmbox.schemas:
        * lib/rb-preferences.h:
        * shell/rb-shell-preferences.c: (rb_shell_preferences_init),
        (rb_shell_preferences_sync), (update_playback_prefs_sensitivity),
        (rb_shell_preferences_player_backend_cb),
        (rb_shell_preferences_album_crossfade_cb),
        (rb_shell_preferences_transition_duration_cb),
        (rb_shell_preferences_network_buffer_size_cb):
        Add preferences UI for playback.

        Fixes #130426.