greplay.py

#Copyright (c) 2008, Media Modifications Ltd.

#Permission is hereby granted, free of charge, to any person obtaining a copy
#of this software and associated documentation files (the "Software"), to deal
#in the Software without restriction, including without limitation the rights
#to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
#copies of the Software, and to permit persons to whom the Software is
#furnished to do so, subject to the following conditions:

#The above copyright notice and this permission notice shall be included in
#all copies or substantial portions of the Software.

#THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
#IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
#AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
#LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
#OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
#THE SOFTWARE.

import gst
import gst.interfaces
import pygst
pygst.require('0.10')
import gobject
import os

import record
import utils

class Greplay(gobject.GObject):

    __gsignals__ = {
        'coverart-found':
            (gobject.SIGNAL_RUN_FIRST, None, [object])
    }


    def findAlbumArt( self, path ):
        record.Record.log.debug("getAlbumArt")
        if (path == None):
            record.Record.log.debug("getAlbumArt: path==None")
            self.emit('coverart-found', None)
            return
        if (not os.path.exists(path)):
            record.Record.log.debug("getAlbumArt: path doesn't exist")
            self.emit('coverart-found', None)
            return

        self.pp = gst.parse_launch("filesrc location="+str(path)+" ! oggdemux ! vorbisdec ! fakesink")
        self.pp.get_bus().add_signal_watch()
        self.pp.get_bus().connect("message", self._onMessageCb)
        self.pp.set_state(gst.STATE_PLAYING)


    def _onMessageCb(self, bus, message):
        t = message.type
        if t == gst.MESSAGE_EOS:
            record.Record.log.debug("Greplay:MESSAGE_EOS")
            self.emit('coverart-found', None)
            self.pp.set_state(gst.STATE_NULL)
            return False
        elif t == gst.MESSAGE_ERROR:
            record.Record.log.debug("Greplay:MESSAGE_ERROR")
            self.emit('coverart-found', None)
            self.pp.set_state(gst.STATE_NULL)
            return False
        elif t == gst.MESSAGE_TAG:
            tags = message.parse_tag()
            for tag in tags.keys():
                if (str(tag) == "extended-comment"):
                    record.Record.log.debug("Found the tag!")
                    #todo, check for tagname
                    base64imgString = str(tags[tag])[len("coverart="):]

                    pixbuf = utils.getPixbufFromString(base64imgString)
                    self.pp.set_state(gst.STATE_NULL)
                    self.emit('coverart-found', pixbuf)
                    return False
        return True