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AsxPlaylistDecoder.py

##########################################################################
# Copyright 2009 Carlos Ribeiro
#
# This file is part of Radio Tray
#
# Radio Tray is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 1 of the License, or
# (at your option) any later version.
#
# Radio Tray 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Radio Tray.  If not, see <http://www.gnu.org/licenses/>.
#
##########################################################################
import urllib2
from lxml import etree
from lxml import objectify
from StringIO import StringIO

class AsxPlaylistDecoder:

    def __init__(self):
        print "ASX-familiy playlist decoder"


    def isStreamValid(self, contentType, firstBytes):

        if('audio/x-ms-wax' in contentType or 'video/x-ms-wvx' in contentType):
            print "Stream is readable by ASX Playlist Decoder"
            return True
        elif(contentType == 'video/x-ms-asf' and firstBytes.strip().lower().startswith('<asx')):
            print "Stream is readable by ASX Playlist Decoder"
            return True
        else:
            return False

        
    def extractPlaylist(self,  url):

        print "Downloading playlist..."

        req = urllib2.Request(url)
        f = urllib2.urlopen(req)
        str = f.read()
        f.close()

        print "Playlist downloaded"
        print "Decoding playlist..."

        parser = etree.XMLParser(recover=True)
        root = etree.parse(StringIO(str),parser)

        #ugly hack to normalize the XML
        for element in root.iter():

            tmp = element.tag
            element.tag = tmp.lower()

            for key in element.attrib.iterkeys():
                element.attrib[key.lower()] = element.attrib[key]


        result = root.xpath("//ref/@href")

        if (len(result) > 0):

            for i in range(1,len(result)):

                tmp = result[i]
                if (tmp.endswith("?MSWMExt=.asf")):
                    result[i] = tmp.replace("http", "mms")
            return result
        else:
            return []

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