Package flumotion :: Package component :: Package encoders :: Package vorbis :: Module vorbis010
[hide private]

Source Code for Module flumotion.component.encoders.vorbis.vorbis010

  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 gst 
 23   
 24  from flumotion.common import gstreamer 
 25  from flumotion.component import feedcomponent 
 26  from vorbisutils import get_max_sample_rate, get_preferred_sample_rate 
 27   
 28  __version__ = "$Rev$" 
 29   
 30   
31 -class Vorbis(feedcomponent.EncoderComponent):
32 checkTimestamp = True 33 checkOffset = True 34 # Add a tolerance of 20ms to audiorate to fix cracking audio 35 DEFAULT_TOLERANCE = 20000000 #20ms 36
37 - def do_check(self):
38 self.debug('running Vorbis check') 39 from flumotion.worker.checks import encoder 40 d = encoder.checkVorbis() 41 42 d.addCallback(self._checkCallback) 43 44 return d
45
46 - def _checkCallback(self, result):
47 for m in result.messages: 48 self.addMessage(m)
49
50 - def get_pipeline_string(self, properties):
51 self.bitrate = properties.get('bitrate', -1) 52 self.quality = properties.get('quality', 0.3) 53 self.channels = properties.get('channels', 2) 54 resampler = 'audioresample' 55 if gstreamer.element_factory_exists('legacyresample'): 56 resampler = 'legacyresample' 57 return ('audiorate name=art ! ' 58 '%s name=ar ! audioconvert ! capsfilter name=cf ' 59 '! vorbisenc name=enc' % resampler)
60
61 - def configure_pipeline(self, pipeline, properties):
62 enc = pipeline.get_by_name('enc') 63 cf = pipeline.get_by_name('cf') 64 ar = pipeline.get_by_name('ar') 65 art = pipeline.get_by_name('art') 66 67 assert enc and cf and ar and art 68 69 if self.bitrate > -1: 70 enc.set_property('bitrate', self.bitrate) 71 else: 72 enc.set_property('quality', self.quality) 73 74 if gstreamer.element_has_property(art, 'tolerance'): 75 art.set_property('tolerance', self.DEFAULT_TOLERANCE) 76 77 pad = ar.get_pad('sink') 78 handle = None 79 80 def buffer_probe(pad, buffer): 81 # this comes from another thread 82 caps = buffer.get_caps() 83 in_rate = caps[0]['rate'] 84 85 # now do necessary filtercaps 86 rate = in_rate 87 if self.bitrate > -1: 88 maxsamplerate = get_max_sample_rate( 89 self.bitrate, self.channels) 90 if in_rate > maxsamplerate: 91 rate = get_preferred_sample_rate(maxsamplerate) 92 self.debug( 93 'rate %d > max rate %d (for %d kbit/sec), ' 94 'selecting rate %d instead' % ( 95 in_rate, maxsamplerate, self.bitrate, rate)) 96 97 caps_str = 'audio/x-raw-float, rate=%d, channels=%d' % (rate, 98 self.channels) 99 cf.set_property('caps', 100 gst.caps_from_string(caps_str)) 101 pad.remove_buffer_probe(handle) 102 return True
103 104 handle = pad.add_buffer_probe(buffer_probe)
105