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"""
 jukeboxactivity.py
 Activity that plays media.
 Copyright (C) 2007 Andy Wingo <wingo@pobox.com>
 Copyright (C) 2007 Red Hat, Inc.
"""

# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
# USA


import logging
from gettext import gettext as _
import os

from sugar.activity import activity

import pygtk
pygtk.require('2.0')

import sys

import gobject

import pygst
pygst.require('0.10')
import gst
import gst.interfaces
import gtk

import urllib

class JukeboxActivity(activity.Activity):
    UPDATE_INTERVAL = 500

    def __init__(self, handle):
        activity.Activity.__init__(self, handle)
        self.set_title(_('Jukebox Activity'))

        toolbox = activity.ActivityToolbox(self)
        self.set_toolbox(toolbox)

        self.toolbar = toolbar = ControlToolbar(toolbox, self)
        toolbox.add_toolbar(_('Play'), toolbar)

        toolbar.show()
        toolbox.show()

        self.connect("shared", self._shared_cb)

        if handle.uri:
            pass
        elif self._shared_activity:
            if self.get_shared():
                pass
            else:
                # Wait for a successful join before trying to get the document
                self.connect("joined", self._joined_cb)

        self.update_id = -1
        self.changed_id = -1
        self.seek_timeout_id = -1
        self.player = None
        self.uri = None
        self.tags = {}
        self.only_audio = False
        self.got_stream_info = False

        self.p_position = gst.CLOCK_TIME_NONE
        self.p_duration = gst.CLOCK_TIME_NONE

        self.player = None
        self.bin = gtk.HBox()
        self.videowidget = VideoWidget()
        self.bin.add(self.videowidget)
        self.set_canvas(self.bin)
        self.show_all()

        if handle.uri:
            self.uri = handle.uri
            gobject.idle_add(self._start, self.uri)

    def _player_eos_cb(self, widget):
        self.player.seek(0L)
        self.play_toggled()

    def _player_error_cb(self, widget, message, detail):
        self.player.stop()
        self.player.set_uri(None)
        self.toolbar.set_disabled()
        self.bin.remove(self.videowidget)
        text = gtk.Label("Error: %s - %s" % (message, detail))
        text.show_all()
        self.bin.add(text)

    def _player_new_tag_cb(self, widget, tag, value):
        if not tag in [gst.TAG_TITLE, gst.TAG_ARTIST, gst.TAG_ALBUM]:
            return
        self.tags[tag] = value
        self._update_overlay()

    def _update_overlay(self):
        if self.only_audio == False:
            return
        if not self.tags.has_key(gst.TAG_TITLE) or not self.tags.has_key(gst.TAG_ARTIST):
            return
        album = None
        if self.tags.has_key(gst.TAG_ALBUM):
            album = self.tags[gst.TAG_ALBUM]
        self.player.set_overlay(self.tags[gst.TAG_TITLE], self.tags[gst.TAG_ARTIST], album)

    def _player_stream_info_cb(self, widget, stream_info):
        if not len(stream_info) or self.got_stream_info:
            return

        GST_STREAM_TYPE_UNKNOWN = 0
        GST_STREAM_TYPE_AUDIO   = 1
        GST_STREAM_TYPE_VIDEO   = 2
        GST_STREAM_TYPE_TEXT    = 3

        only_audio = True
        for item in stream_info:
            if item.props.type == GST_STREAM_TYPE_VIDEO:
                only_audio = False
        self.only_audio = only_audio
        self.got_stream_info = True
        self._update_overlay()

    def _joined_cb(self, activity):
        logging.debug("someone joined")
        pass

    def _shared_cb(self, activity):
        logging.debug("shared start")
        pass

    def read_file(self, file_path):
        self.uri = "file://" + urllib.quote(os.path.abspath(file_path))
        gobject.idle_add(self._start, self.uri)

    def _start(self, uri=None):
        if not uri:
            return False
        # FIXME: parse m3u files and extract actual URL
        if not self.player:
            # lazy init the player so that videowidget is realized
            # and has a valid widget allocation
            self.player = GstPlayer(self.videowidget)
            self.player.connect("eos", self._player_eos_cb)
            self.player.connect("error", self._player_error_cb)
            self.player.connect("tag", self._player_new_tag_cb)
            self.player.connect("stream-info", self._player_stream_info_cb)

        self.player.set_uri(uri)
        self.play_toggled()
        self.show_all()
        return False

    def play_toggled(self):
        if self.player.is_playing():
            self.player.pause()
            self.toolbar.set_button_play()
        else:
            if self.player.error:
                self.toolbar.set_disabled()
            else:
                self.player.play()
                if self.update_id == -1:
                    self.update_id = gobject.timeout_add(self.UPDATE_INTERVAL,
                                                         self.update_scale_cb)
                self.toolbar.set_button_pause()

    def scale_button_press_cb(self, widget, event):
        self.toolbar.button.set_sensitive(False)
        self.was_playing = self.player.is_playing()
        if self.was_playing:
            self.player.pause()

        # don't timeout-update position during seek
        if self.update_id != -1:
            gobject.source_remove(self.update_id)
            self.update_id = -1

        # make sure we get changed notifies
        if self.changed_id == -1:
            self.changed_id = self.toolbar.hscale.connect('value-changed',
                self.scale_value_changed_cb)
            
    def scale_value_changed_cb(self, scale):
        # see seek.c:seek_cb
        real = long(scale.get_value() * self.p_duration / 100) # in ns
        self.player.seek(real)
        # allow for a preroll
        self.player.get_state(timeout=50*gst.MSECOND) # 50 ms

    def scale_button_release_cb(self, widget, event):
        # see seek.cstop_seek
        widget.disconnect(self.changed_id)
        self.changed_id = -1

        self.toolbar.button.set_sensitive(True)
        if self.seek_timeout_id != -1:
            gobject.source_remove(self.seek_timeout_id)
            self.seek_timeout_id = -1
        else:
            if self.was_playing:
                self.player.play()

        if self.update_id != -1:
            self.error('Had a previous update timeout id')
        else:
            self.update_id = gobject.timeout_add(self.UPDATE_INTERVAL,
                self.update_scale_cb)

    def update_scale_cb(self):
        self.p_position, self.p_duration = self.player.query_position()
        if self.p_position != gst.CLOCK_TIME_NONE:
            value = self.p_position * 100.0 / self.p_duration
            self.toolbar.adjustment.set_value(value)

        return True

class ControlToolbar(gtk.Toolbar):
    def __init__(self, toolbox, jukebox):
        gtk.Toolbar.__init__(self)
        
        self.toolbox = toolbox
        self.jukebox = jukebox

        self.pause_image = gtk.image_new_from_stock(gtk.STOCK_MEDIA_PAUSE,
                                                    gtk.ICON_SIZE_BUTTON)
        self.pause_image.show()
        self.play_image = gtk.image_new_from_stock(gtk.STOCK_MEDIA_PLAY,
                                                   gtk.ICON_SIZE_BUTTON)
        self.play_image.show()

        self.button = gtk.ToolButton()
        self.button.set_icon_widget(self.play_image)
        self.button.set_property('can-default', True)
        self.button.show()
        self.button.connect('clicked', self._button_clicked_cb)

        self.insert(self.button, -1)

        self.adjustment = gtk.Adjustment(0.0, 0.00, 100.0, 0.1, 1.0, 1.0)
        self.hscale = gtk.HScale(self.adjustment)
        self.hscale.set_draw_value(False)
        self.hscale.set_update_policy(gtk.UPDATE_CONTINUOUS)
        self.hscale.connect('button-press-event', jukebox.scale_button_press_cb)
        self.hscale.connect('button-release-event', jukebox.scale_button_release_cb)
        
        self.scale_item = gtk.ToolItem()
        self.scale_item.set_expand(True)
        self.scale_item.add(self.hscale)
        self.insert(self.scale_item, -1)

    def _button_clicked_cb(self, widget):
        self.jukebox.play_toggled()

    def set_button_play(self):
        self.button.set_icon_widget(self.play_image)
        
    def set_button_pause(self):
        self.button.set_icon_widget(self.pause_image)

    def set_disabled(self):
        self.button.set_sensitive(False)
        self.scale_item.set_sensitive(False)
        self.hscale.set_sensitive(False)
        
class GstPlayer(gobject.GObject):
    __gsignals__ = {
        'error': (gobject.SIGNAL_RUN_FIRST, None, [str, str]),
        'eos'  : (gobject.SIGNAL_RUN_FIRST, None, []),
        'tag'  : (gobject.SIGNAL_RUN_FIRST, None, [str, str]),
        'stream-info' : (gobject.SIGNAL_RUN_FIRST, None, [object])
    }

    def __init__(self, videowidget):
        gobject.GObject.__init__(self)

        self.playing = False
        self.error = False

        self.player = gst.element_factory_make("playbin", "player")

        r = gst.registry_get_default()
        l = [x for x in r.get_feature_list(gst.ElementFactory) if (gst.ElementFactory.get_klass(x) == "Visualization")]
        if len(l):
            e = l.pop() # take latest plugin in the list
            vis_plug = gst.element_factory_make(e.get_name())
            self.player.set_property('vis-plugin', vis_plug)

        self.overlay = None
        self.videowidget = videowidget
        self._init_video_sink()

        bus = self.player.get_bus()
        bus.enable_sync_message_emission()
        bus.add_signal_watch()
        bus.connect('sync-message::element', self.on_sync_message)
        bus.connect('message', self.on_message)

    def set_uri(self, uri):
        self.player.set_property('uri', uri)

    def on_sync_message(self, bus, message):
        if message.structure is None:
            return
        if message.structure.get_name() == 'prepare-xwindow-id':
            self.videowidget.set_sink(message.src)
            message.src.set_property('force-aspect-ratio', True)
            
    def on_message(self, bus, message):
        t = message.type
        if t == gst.MESSAGE_ERROR:
            err, debug = message.parse_error()
            logging.debug("Error: %s - %s" % (err, debug))
            self.error = True
            self.emit("eos")
            self.playing = False
            self.emit("error", str(err), str(debug))
        elif t == gst.MESSAGE_EOS:
            self.emit("eos")
            self.playing = False
        elif t == gst.MESSAGE_TAG:
            tags = message.parse_tag()
            for tag in tags.keys():
                self.emit('tag', str(tag), str(tags[tag]))
        elif t == gst.MESSAGE_STATE_CHANGED:
            old, new, pen = message.parse_state_changed()
            if old == gst.STATE_READY and new == gst.STATE_PAUSED:
                self.emit('stream-info', self.player.props.stream_info_value_array)

    def _init_video_sink(self):
        self.bin = gst.Bin()
        videoscale = gst.element_factory_make('videoscale')
        self.bin.add(videoscale)
        pad = videoscale.get_pad("sink")
        ghostpad = gst.GhostPad("sink", pad)
        self.bin.add_pad(ghostpad)
        videoscale.set_property("method", 0)

        caps_string = "video/x-raw-yuv, "
        r = self.videowidget.get_allocation()
        if r.width > 500 and r.height > 500:
            # Sigh... xvimagesink on the XOs will scale the video to fit
            # but ximagesink in Xephyr does not.  So we live with unscaled
            # video in Xephyr so that the XO can work right.
            w = 480
            h = float(w) / float(float(r.width) / float(r.height))
            caps_string += "width=%d, height=%d" % (w, h)
        else:
            caps_string += "width=480, height=360"
        caps = gst.Caps(caps_string)
        self.filter = gst.element_factory_make("capsfilter", "filter")
        self.bin.add(self.filter)
        self.filter.set_property("caps", caps)

        textoverlay = gst.element_factory_make('textoverlay')
        self.overlay = textoverlay
        self.bin.add(textoverlay)
        conv = gst.element_factory_make ("ffmpegcolorspace", "conv");
        self.bin.add(conv)
        videosink = gst.element_factory_make('autovideosink')
        self.bin.add(videosink)
        gst.element_link_many(videoscale, self.filter, textoverlay, conv, videosink)
        self.player.set_property("video-sink", self.bin)

    def set_overlay(self, title, artist, album):
        text = "%s\n%s" % (title, artist)
        if album and len(album):
            text += "\n%s" % album
        self.overlay.set_property("text", text)
        self.overlay.set_property("font-desc", "sans bold 14")
        self.overlay.set_property("halignment", "right")
        self.overlay.set_property("valignment", "bottom")
        try:
            # Only in OLPC versions of gstreamer-plugins-base for now
            self.overlay.set_property("line-align", "left")
        except:
            pass

    def query_position(self):
        "Returns a (position, duration) tuple"
        try:
            position, format = self.player.query_position(gst.FORMAT_TIME)
        except:
            position = gst.CLOCK_TIME_NONE

        try:
            duration, format = self.player.query_duration(gst.FORMAT_TIME)
        except:
            duration = gst.CLOCK_TIME_NONE

        return (position, duration)

    def seek(self, location):
        """
        @param location: time to seek to, in nanoseconds
        """
        event = gst.event_new_seek(1.0, gst.FORMAT_TIME,
            gst.SEEK_FLAG_FLUSH | gst.SEEK_FLAG_ACCURATE,
            gst.SEEK_TYPE_SET, location,
            gst.SEEK_TYPE_NONE, 0)

        res = self.player.send_event(event)
        if res:
            self.player.set_new_stream_time(0L)
        else:
            logging.debug("seek to %r failed" % location)

    def pause(self):
        logging.debug("pausing player")
        self.player.set_state(gst.STATE_PAUSED)
        self.playing = False

    def play(self):
        logging.debug("playing player")
        self.player.set_state(gst.STATE_PLAYING)
        self.playing = True
        self.error = False
        
    def stop(self):
        self.player.set_state(gst.STATE_NULL)
        logging.debug("stopped player")

    def get_state(self, timeout=1):
        return self.player.get_state(timeout=timeout)

    def is_playing(self):
        return self.playing
    
class VideoWidget(gtk.DrawingArea):
    def __init__(self):
        gtk.DrawingArea.__init__(self)
        self.imagesink = None
        self.unset_flags(gtk.DOUBLE_BUFFERED)
        self.set_flags(gtk.APP_PAINTABLE)

    def do_expose_event(self, event):
        if self.imagesink:
            self.imagesink.expose()
            return False
        else:
            return True

    def set_sink(self, sink):
        assert self.window.xid
        self.imagesink = sink
        self.imagesink.set_xwindow_id(self.window.xid)