Source Code for Module flumotion.component.converters.overlay.overlay

 1  # -*- Mode: Python -*- 
 2  # vi:si:et:sw=4:sts=4:ts=4 
 3  # 
 4  # Flumotion - a streaming media server 
 5  # Copyright (C) 2004,2005,2006,2007 Fluendo, S.L. (www.fluendo.com). 
 6  # All rights reserved. 
 7   
 8  # This file may be distributed and/or modified under the terms of 
 9  # the GNU General Public License version 2 as published by 
10  # the Free Software Foundation. 
11  # This file is distributed without any warranty; without even the implied 
12  # warranty of merchantability or fitness for a particular purpose. 
13  # See "LICENSE.GPL" in the source distribution for more information. 
14   
15  # Licensees having purchased or holding a valid Flumotion Advanced 
16  # Streaming Server license may use this file in accordance with the 
17  # Flumotion Advanced Streaming Server Commercial License Agreement. 
18  # See "LICENSE.Flumotion" in the source distribution for more information. 
19   
20  # Headers in this file shall remain intact. 
21   
22  import os 
23  import tempfile 
24   
25   
26  from twisted.internet import defer 
27   
28  from flumotion.common import log, messages 
29   
30  from flumotion.component import feedcomponent 
31  from flumotion.component.converters.overlay import genimg 
32   
33  N_ = messages.N_ 
34  T_ = messages.gettexter('flumotion') 
35   
36   
37 -class Overlay(feedcomponent.ParseLaunchComponent): 
38      checkTimestamp = True 
39      checkOffset = True 
40      _filename = None 
41   
42 -    def get_pipeline_string(self, properties): 
43          # the order here is important; to have our eater be the reference 
44          # stream for videomixer it needs to be specified last 
45          pipeline = ( 
46              'filesrc name=source blocksize=100000 ! pngdec ! alphacolor ! ' 
47              'videomixer name=mix ! @feeder:default@ ' 
48              '@eater:default@ ! ffmpegcolorspace ! mix.') 
49   
50          return pipeline 
51   
52 -    def configure_pipeline(self, pipeline, properties): 
53          p = properties 
54          self.fixRenamedProperties(p, [ 
55                  ('show_text',    'show-text'), 
56                  ('fluendo_logo', 'fluendo-logo'), 
57                  ('cc_logo',      'cc-logo'), 
58                  ('xiph_logo',    'xiph-logo') 
59              ]) 
60   
61          # create temp file 
62          (fd, self._filename) = tempfile.mkstemp('flumotion.png') 
63          os.close(fd) 
64   
65          text = None 
66          if p.get('show-text', False): 
67              text = p.get('text', 'set the "text" property') 
68          overflow = genimg.generate_overlay(self._filename, 
69                                             text, 
70                                             p.get('fluendo-logo', False), 
71                                             p.get('cc-logo', False), 
72                                             p.get('xiph-logo', False), 
73                                             p['width'], 
74                                             p['height']) 
75          if overflow: 
76              m = messages.Warning( 
77                  T_(N_("Overlayed text '%s' too wide for the video image."), 
78                     text), id = "text-too-wide") 
79              self.addMessage(m) 
80   
81          source = self.get_element('source') 
82          source.set_property('location', self._filename) 
83   
84 -    def do_stop(self): 
85          # clean up our temp file 
86          if self._filename: 
87              self.debug('Removing temporary overlay file %s' % self._filename) 
88              os.unlink(self._filename) 
89              self._filename = None 
90          else: 
91              self.debug("Temporary overlay already gone, " \ 
92                  "did we not start up correctly ?") 
93