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#!/usr/bin/env python
# -*- Mode: Python -*-
# vi:si:et:sw=4:sts=4:ts=4
#
# GStreamer python bindings
# Copyright (C) 2005 Edward Hervey <edward at fluendo dot com>
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import os
import sys
import gobject
import pygst
pygst.require('0.10')
import gst
from pygobject import gsignal
EOS = 'EOS'
ERROR = 'ERROR'
WRONG_TYPE = 'WRONG_TYPE'
UNKNOWN_TYPE = 'UNKNOWN_TYPE'
class AudioSource(gst.Bin):
"""A bin for audio sources with proper audio converters"""
gsignal('done', str)
gsignal('prerolled')
def __init__(self, filename, caps="audio/x-raw-int,channels=2,rate=44100"):
# with pygtk 2.4 this call is needed for the gsignal to work
gst.Bin.__init__(self)
self.filename = filename
self.outcaps = caps
self.filesrc = gst.element_factory_make("filesrc")
self.filesrc.set_property("location", self.filename)
self.dbin = gst.element_factory_make("decodebin")
self.audioconvert = gst.element_factory_make("audioconvert")
self.audioresample = gst.element_factory_make("audioresample")
self.volume = gst.element_factory_make("volume")
self.add(self.filesrc, self.dbin,
self.audioconvert, self.audioresample, self.volume)
self.filesrc.link(self.dbin)
self.audioconvert.link(self.audioresample)
self.audioresample.link(self.volume, caps)
self.dbin.connect("new-decoded-pad", self._new_decoded_pad_cb)
self.dbin.connect("unknown-type", self._unknown_type_cb)
self._srcpad = None
def __repr__(self):
return "<AudioSource for %s>" % self.filename
def set_volume(self, volume):
gst.debug("setting volume to %f" % volume)
self.volume.set_property("volume", volume)
def _new_decoded_pad_cb(self, dbin, pad, is_last):
gst.debug("new decoded pad: pad %r [%s]" % (pad, pad.get_caps().to_string()))
if not "audio" in pad.get_caps().to_string() or self._srcpad:
return
gst.debug("linking pad %r to audioconvert" % pad)
pad.link(self.audioconvert.get_pad("sink"))
self._srcpad = gst.GhostPad("src", self.volume.get_pad("src"))
self._srcpad.set_active(True)
self.add_pad(self._srcpad)
def _unknown_type_cb(self, pad, caps):
self.emit('done', UNKNOWN_TYPE)
def stop(self):
self.set_state(gst.STATE_NULL)
def clean(self):
self.stop()
self.remove(self.filesrc)
self.remove(self.dbin)
self.remove(self.audioconvert)
self.remove(self.audioresample)
self.remove(self.volume)
self.filesrc = None
self.dbin = None
self.audioconvert = None
self.volume = None
gobject.type_register(AudioSource)
# run us to test
if __name__ == "__main__":
main = gobject.MainLoop()
def _done_cb(source, reason):
print "Done"
sys.stdout.flush()
if reason != EOS:
print "Some error happened: %s" % reason
main.quit()
def _error_cb(source, element, gerror, message):
print "Error: %s" % gerror
main.quit()
try:
source = AudioSource(sys.argv[1])
except IndexError:
sys.stderr.write("Please give a filename to play\n")
sys.exit(1)
pipeline = gst.Pipeline("playing")
# connecting on the source also catches eos emit when
# no audio pad
source.connect('done', _done_cb)
pipeline.connect('error', _error_cb)
p = "osssink"
if len(sys.argv) > 2:
p = " ".join(sys.argv[2:])
pipeline.add(source)
sink = gst.parse_launch(p)
pipeline.add(sink)
source.link(sink)
# we schedule this as a timeout so that we are definately in the main
# loop when it goes to PLAYING, and errors make main.quit() work correctly
def _start(pipeline):
print "setting pipeline to PLAYING"
pipeline.set_state(gst.STATE_PLAYING)
print "set pipeline to PLAYING"
gobject.timeout_add(0, _start, pipeline)
gobject.idle_add(pipeline.iterate)
print "Going into main loop"
main.run()
print "Left main loop"
pipeline.set_state(gst.STATE_NULL)
pipeline.remove(source)
pipeline.remove(sink)
utils.gc_collect('cleaned out pipeline')
source.clean()
utils.gc_collect('cleaned up source')
source = None
utils.gc_collect('set source to None')
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