/usr/share/decibel-audio-player/src/media/audioplayer.py is in decibel-audio-player 1.04-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Author: Ingelrest François (Francois.Ingelrest@gmail.com)
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import pygst
pygst.require('0.10')
import gst
class AudioPlayer:
def __init__(self, callbackEnded, usePlaybin2=False):
""" Constructor """
if usePlaybin2:
self.player = gst.element_factory_make('playbin2', 'player')
self.player.connect('about-to-finish', self.__onAboutToFinish)
else:
self.player = gst.element_factory_make('playbin', 'player')
self.nextURI = None
self.equalizer = None
self.replaygain = None
self.cdReadSpeed = 1
self.callbackEnded = callbackEnded
# No video
self.player.set_property('video-sink', gst.element_factory_make('fakesink', 'fakesink'))
# Change the audio sink to our own bin, so that an equalizer/replay gain element can be added later on if needed
self.audiobin = gst.Bin('audiobin')
self.audiosink = gst.element_factory_make('autoaudiosink', 'audiosink')
# Callback when the source of the playbin is changed
self.player.connect('notify::source', self.__onNewPlaybinSource)
self.audiobin.add(self.audiosink)
self.audiobin.add_pad(gst.GhostPad('sink', self.audiosink.get_pad('sink')))
self.player.set_property('audio-sink', self.audiobin)
# Monitor messages generated by the player
bus = self.player.get_bus()
bus.add_signal_watch()
bus.connect('message', self.__onGstMessage)
def __onNewPlaybinSource(self, playbin, params):
""" Change the CR-ROM drive speed to 1 when applicable """
source = self.player.get_by_name('source')
# Didn't find a way to determine the real class of source
# So we use the 'paranoia-mode' property to determine whether it's indeed a CD we're playing
try:
source.get_property('paranoia-mode')
source.set_property('read-speed', self.cdReadSpeed)
except:
pass
def __onAboutToFinish(self, isLast):
""" Feed the next URI if we have one """
if self.nextURI is not None:
self.player.set_property('uri', self.nextURI)
self.nextURI = None
self.callbackEnded(False)
def __onGstMessage(self, bus, msg):
""" A new message generated by the player """
if msg.type == gst.MESSAGE_EOS: self.callbackEnded(False)
elif msg.type == gst.MESSAGE_ERROR: self.callbackEnded(True)
return True
def setCDReadSpeed(self, speed):
""" Set the CD-ROM drive read speed """
self.cdReadSpeed = speed
def setNextURI(self, uri):
""" Set the next URI """
self.nextURI = uri.replace('%', '%25').replace('#', '%23')
def clearNextURI(self):
""" Clear the next URI """
self.nextURI = None
def setVolume(self, level):
""" Set the volume to the given level (0 <= level <= 1) """
if level < 0: level = 0
elif level > 1: level = 1
self.player.set_property('volume', level)
def __saveRestoreState(self, func):
""" """
savedState = self.player.get_state()[1]
self.player.set_state(gst.STATE_NULL)
func()
self.player.set_state(savedState)
def __enableEqualizer(self):
""" Add an equalizer to the audio chain """
self.equalizer = gst.element_factory_make('equalizer-10bands', 'equalizer')
self.audiobin.add(self.equalizer)
if self.replaygain is None:
self.audiobin.get_pad('sink').set_target(self.equalizer.get_pad('sink'))
else:
self.replaygain.unlink(self.audiosink)
self.replaygain.link(self.equalizer)
self.equalizer.link(self.audiosink)
def __enableReplayGain(self):
""" Add/Enable a replay gain element """
if self.replaygain is None:
self.replaygain = gst.element_factory_make('rgvolume', 'replaygain')
self.audiobin.add(self.replaygain)
self.audiobin.get_pad('sink').set_target(self.replaygain.get_pad('sink'))
if self.equalizer is None: self.replaygain.link(self.audiosink)
else: self.replaygain.link(self.equalizer)
def __disableReplayGain(self):
""" Disable the replay gain element, if any """
if self.replaygain is not None:
if self.equalizer is None: self.audiobin.get_pad('sink').set_target(self.audiosink.get_pad('sink'))
else: self.audiobin.get_pad('sink').set_target(self.equalizer.get_pad('sink'))
self.audiobin.remove(self.replaygain)
def enableEqualizer(self):
""" Add an equalizer to the audio chain """
self.__saveRestoreState(self.__enableEqualizer)
def enableReplayGain(self):
""" Add/Enable a replay gain element """
self.__saveRestoreState(self.__enableReplayGain)
def disableReplayGain(self):
""" Disable the replay gain element, if any """
self.__saveRestoreState(self.__disableReplayGain)
def setEqualizerLvls(self, lvls):
""" Set the level of the 10-bands of the equalizer (levels must be a list/tuple with 10 values lying between -24 and +12) """
if len(lvls) == 10 and self.equalizer is not None:
self.equalizer.set_property('band0', lvls[0])
self.equalizer.set_property('band1', lvls[1])
self.equalizer.set_property('band2', lvls[2])
self.equalizer.set_property('band3', lvls[3])
self.equalizer.set_property('band4', lvls[4])
self.equalizer.set_property('band5', lvls[5])
self.equalizer.set_property('band6', lvls[6])
self.equalizer.set_property('band7', lvls[7])
self.equalizer.set_property('band8', lvls[8])
self.equalizer.set_property('band9', lvls[9])
def isPaused(self):
""" Return whether the player is paused """
return self.player.get_state()[1] == gst.STATE_PAUSED
def isPlaying(self):
""" Return whether the player is paused """
return self.player.get_state()[1] == gst.STATE_PLAYING
def setURI(self, uri):
""" Play the given URI """
self.player.set_property('uri', uri.replace('%', '%25').replace('#', '%23'))
def play(self):
""" Play """
self.player.set_state(gst.STATE_PLAYING)
def pause(self):
""" Pause """
self.player.set_state(gst.STATE_PAUSED)
def stop(self):
""" Stop playing """
self.player.set_state(gst.STATE_NULL)
def seek(self, where):
""" Jump to the given location """
self.player.seek_simple(gst.FORMAT_TIME, gst.SEEK_FLAG_FLUSH, where)
def getPosition(self):
""" Return the current position """
try: return self.player.query_position(gst.FORMAT_TIME)[0]
except: return 0
def getDuration(self):
""" Return the duration of the current stream """
try: return self.player.query_duration(gst.FORMAT_TIME)[0]
except: return 0
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