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110 lines
3 KiB
Python
110 lines
3 KiB
Python
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#!/usr/bin/env python
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# decodebin.py - Audio autopluging example using 'decodebin' element
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# Copyright (C) 2006 Jason Gerard DeRose <jderose@jasonderose.org>
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Library General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Library General Public License for more details.
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#
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# You should have received a copy of the GNU Library General Public
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# License along with this library; if not, write to the
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# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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# Boston, MA 02111-1307, USA.
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import sys
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import gobject
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gobject.threads_init()
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import pygst
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pygst.require('0.10')
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import gst
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class Decodebin:
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def __init__(self, location):
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# The pipeline
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self.pipeline = gst.Pipeline()
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# Create bus and connect several handlers
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self.bus = self.pipeline.get_bus()
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self.bus.add_signal_watch()
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self.bus.connect('message::eos', self.on_eos)
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self.bus.connect('message::tag', self.on_tag)
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self.bus.connect('message::error', self.on_error)
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# Create elements
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self.src = gst.element_factory_make('filesrc')
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self.dec = gst.element_factory_make('decodebin')
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self.conv = gst.element_factory_make('audioconvert')
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self.rsmpl = gst.element_factory_make('audioresample')
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self.sink = gst.element_factory_make('alsasink')
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# Set 'location' property on filesrc
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self.src.set_property('location', location)
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# Connect handler for 'new-decoded-pad' signal
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self.dec.connect('new-decoded-pad', self.on_new_decoded_pad)
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# Add elements to pipeline
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self.pipeline.add(self.src, self.dec, self.conv, self.rsmpl, self.sink)
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# Link *some* elements
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# This is completed in self.on_new_decoded_pad()
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self.src.link(self.dec)
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gst.element_link_many(self.conv, self.rsmpl, self.sink)
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# Reference used in self.on_new_decoded_pad()
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self.apad = self.conv.get_pad('sink')
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# The MainLoop
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self.mainloop = gobject.MainLoop()
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# And off we go!
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self.pipeline.set_state(gst.STATE_PLAYING)
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self.mainloop.run()
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def on_new_decoded_pad(self, element, pad, last):
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caps = pad.get_caps()
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name = caps[0].get_name()
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print 'on_new_decoded_pad:', name
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if name == 'audio/x-raw-float' or name == 'audio/x-raw-int':
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if not self.apad.is_linked(): # Only link once
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pad.link(self.apad)
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def on_eos(self, bus, msg):
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print 'on_eos'
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self.mainloop.quit()
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def on_tag(self, bus, msg):
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taglist = msg.parse_tag()
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print 'on_tag:'
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for key in taglist.keys():
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print '\t%s = %s' % (key, taglist[key])
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def on_error(self, bus, msg):
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error = msg.parse_error()
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print 'on_error:', error[1]
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self.mainloop.quit()
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if __name__ == '__main__':
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if len(sys.argv) == 2:
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Decodebin(sys.argv[1])
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else:
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print 'Usage: %s /path/to/media/file' % sys.argv[0]
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