mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-18 22:36:33 +00:00
109 lines
3 KiB
Python
109 lines
3 KiB
Python
#!/usr/bin/env python
|
|
|
|
# decodebin.py - Audio autopluging example using 'decodebin' element
|
|
# Copyright (C) 2006 Jason Gerard DeRose <jderose@jasonderose.org>
|
|
|
|
# This library is free software; you can redistribute it and/or
|
|
# modify it under the terms of the GNU Library General Public
|
|
# License as published by the Free Software Foundation; either
|
|
# version 2 of the License, or (at your option) any later version.
|
|
#
|
|
# This library 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
|
|
# Library General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU Library General Public
|
|
# License along with this library; if not, write to the
|
|
# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
|
|
# Boston, MA 02110-1301, USA.
|
|
|
|
import sys
|
|
|
|
import gobject
|
|
gobject.threads_init()
|
|
|
|
import pygst
|
|
pygst.require('0.10')
|
|
import gst
|
|
|
|
|
|
class Decodebin:
|
|
def __init__(self, location):
|
|
# The pipeline
|
|
self.pipeline = gst.Pipeline()
|
|
|
|
# Create bus and connect several handlers
|
|
self.bus = self.pipeline.get_bus()
|
|
self.bus.add_signal_watch()
|
|
self.bus.connect('message::eos', self.on_eos)
|
|
self.bus.connect('message::tag', self.on_tag)
|
|
self.bus.connect('message::error', self.on_error)
|
|
|
|
# Create elements
|
|
self.src = gst.element_factory_make('filesrc')
|
|
self.dec = gst.element_factory_make('decodebin')
|
|
self.conv = gst.element_factory_make('audioconvert')
|
|
self.rsmpl = gst.element_factory_make('audioresample')
|
|
self.sink = gst.element_factory_make('alsasink')
|
|
|
|
# Set 'location' property on filesrc
|
|
self.src.set_property('location', location)
|
|
|
|
# Connect handler for 'new-decoded-pad' signal
|
|
self.dec.connect('new-decoded-pad', self.on_new_decoded_pad)
|
|
|
|
# Add elements to pipeline
|
|
self.pipeline.add(self.src, self.dec, self.conv, self.rsmpl, self.sink)
|
|
|
|
# Link *some* elements
|
|
# This is completed in self.on_new_decoded_pad()
|
|
self.src.link(self.dec)
|
|
gst.element_link_many(self.conv, self.rsmpl, self.sink)
|
|
|
|
# Reference used in self.on_new_decoded_pad()
|
|
self.apad = self.conv.get_pad('sink')
|
|
|
|
# The MainLoop
|
|
self.mainloop = gobject.MainLoop()
|
|
|
|
# And off we go!
|
|
self.pipeline.set_state(gst.STATE_PLAYING)
|
|
self.mainloop.run()
|
|
|
|
|
|
def on_new_decoded_pad(self, element, pad, last):
|
|
caps = pad.get_caps()
|
|
name = caps[0].get_name()
|
|
print 'on_new_decoded_pad:', name
|
|
if name == 'audio/x-raw-float' or name == 'audio/x-raw-int':
|
|
if not self.apad.is_linked(): # Only link once
|
|
pad.link(self.apad)
|
|
|
|
|
|
def on_eos(self, bus, msg):
|
|
print 'on_eos'
|
|
self.mainloop.quit()
|
|
|
|
|
|
def on_tag(self, bus, msg):
|
|
taglist = msg.parse_tag()
|
|
print 'on_tag:'
|
|
for key in taglist.keys():
|
|
print '\t%s = %s' % (key, taglist[key])
|
|
|
|
|
|
def on_error(self, bus, msg):
|
|
error = msg.parse_error()
|
|
print 'on_error:', error[1]
|
|
self.mainloop.quit()
|
|
|
|
|
|
|
|
|
|
|
|
if __name__ == '__main__':
|
|
if len(sys.argv) == 2:
|
|
Decodebin(sys.argv[1])
|
|
else:
|
|
print 'Usage: %s /path/to/media/file' % sys.argv[0]
|