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#!/usr/bin/env python
# -*- Mode: Python -*-
# vi:si:et:sw=4:sts=4:ts=4
# audioconcat.py - Concatenates multiple audio files to single ogg/vorbis file
# Uses the gnonlin elements (http://gnonlin.sf.net/)
# Copyright (C) 2005 Edward Hervey <edward@fluendo.com>
# 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., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
#
import sys
import gobject
gobject.threads_init()
import pygst
pygst.require('0.10')
import gst
from gst.extend.discoverer import Discoverer
class AudioDec(gst.Bin):
'''Decodes audio file, outputs at specified caps'''
def __init__(self, location, caps):
gst.Bin.__init__(self)
# Create elements
src = gst.element_factory_make('filesrc')
dec = gst.element_factory_make('decodebin')
conv = gst.element_factory_make('audioconvert')
rsmpl = gst.element_factory_make('audioresample')
ident = gst.element_factory_make('identity')
# Set 'location' property on filesrc
src.set_property('location', location)
# Connect handler for 'new-decoded-pad' signal
dec.connect('new-decoded-pad', self.__on_new_decoded_pad)
# Add elements to bin
self.add(src, dec, conv, rsmpl, ident)
# Link *some* elements
# This is completed in self.__on_new_decoded_pad()
src.link(dec)
conv.link(rsmpl)
rsmpl.link(ident, caps)
# Reference used in self.__on_new_decoded_pad()
self.__apad = conv.get_pad('sink')
# Add ghost pad
self.add_pad(gst.GhostPad('src', ident.get_pad('src')))
def __on_new_decoded_pad(self, element, pad, last):
caps = pad.get_caps()
name = caps[0].get_name()
print '\n__on_new_decoded_pad:', name
if 'audio' in name:
if not self.__apad.is_linked(): # Only link once
pad.link(self.__apad)
class AudioConcat:
'''Concatenates multiple audio files to single ogg/vorbis file'''
caps = gst.caps_from_string('audio/x-raw-float, rate=44100, channels=2, endianness=1234, width=32')
def __init__(self, infiles, outfile):
# These are used in iteration through infiles
self.infiles = infiles
self.i = 0
self.start = 0L
# The pipeline
self.pipeline = gst.Pipeline()
# Create bus and connect 'eos' and 'error' handlers
self.bus = self.pipeline.get_bus()
self.bus.add_signal_watch()
self.bus.connect('message::eos', self.on_eos)
self.bus.connect('message::error', self.on_error)
# Create elements
self.comp = gst.element_factory_make('gnlcomposition')
self.enc = gst.element_factory_make('vorbisenc')
self.mux = gst.element_factory_make('oggmux')
self.sink = gst.element_factory_make('filesink')
# Connect handler for 'pad-added' signal
self.comp.connect('pad-added', self.on_pad_added)
# Set 'location' property on filesink
self.sink.set_property('location', outfile)
# Add elements to pipeline
self.pipeline.add(self.comp, self.enc, self.mux, self.sink)
# Link *some* elements
# This in completed in self.on_pad_added()
gst.element_link_many(self.enc, self.mux, self.sink)
# Reference used in self.on_pad_added()
self.apad = self.enc.get_pad('sink')
# The MainLoop
self.mainloop = gobject.MainLoop()
# Iterate through infiles
gobject.idle_add(self.discover)
self.mainloop.run()
def discover(self):
infile = self.infiles[self.i]
discoverer = Discoverer(infile)
discoverer.connect('discovered', self.on_discovered, infile)
discoverer.discover()
return False # Don't repeat idle call
def on_discovered(self, discoverer, ismedia, infile):
print '\non_discovered:', infile
discoverer.print_info()
if discoverer.is_audio:
dec = AudioDec(infile, self.caps)
src = gst.element_factory_make('gnlsource')
src.add(dec)
src.set_property('media-start', 0L)
src.set_property('media-duration', discoverer.audiolength)
src.set_property('start', self.start)
src.set_property('duration', discoverer.audiolength)
self.comp.add(src)
self.start += discoverer.audiolength
self.i += 1
if self.i < len(self.infiles):
gobject.idle_add(self.discover)
else:
if self.start > 0: # At least 1 infile is_audio and audiolength > 0
self.pipeline.set_state(gst.STATE_PLAYING)
else:
self.mainloop.quit()
def on_pad_added(self, element, pad):
caps = pad.get_caps()
name = caps[0].get_name()
print '\non_pad_added:', name
if name == 'audio/x-raw-float':
if not self.apad.is_linked(): # Only link once
pad.link(self.apad)
def on_eos(self, bus, msg):
print '\non_eos'
self.mainloop.quit()
def on_error(self, bus, msg):
error = msg.parse_error()
print '\non_error:', error[1]
self.mainloop.quit()
if __name__ == '__main__':
if len(sys.argv) >= 3:
AudioConcat(sys.argv[1:-1], sys.argv[-1])
else:
print 'Usage: %s <input_file(s)> <output_file>' % sys.argv[0]
print 'Example: %s song1.mp3 song2.ogg output.ogg' % sys.argv[0]
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