src/utils/qpaeq

   1 #!/usr/bin/env python
   2 #    qpaeq is a equalizer interface for pulseaudio's equalizer sinks
   3 #    Copyright (C) 2009  Jason Newton <nevion@gmail.com
   4 #
   5 #    This program is free software: you can redistribute it and/or modify
   6 #    it under the terms of the GNU Affero General Public License as
   7 #    published by the Free Software Foundation, either version 3 of the
   8 #    License, or (at your option) any later version.
   9 #
  10 #    This program is distributed in the hope that it will be useful,
  11 #    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 #    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 #    GNU Affero General Public License for more details.
  14 #
  15 #    You should have received a copy of the GNU Affero General Public License
  16 #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18
  19 import os,math,sys
  20 try:
  21     import PyQt4,sip
  22     from PyQt4 import QtGui,QtCore
  23     import dbus.mainloop.qt
  24     import dbus
  25 except ImportError,e:
  26     print 'There was an error importing need libraries'
  27     print 'Make sure you haveqt4 and dbus forthon installed'
  28     print 'The error that occured was'
  29     print '\t%s' %(str(e))
  30     import sys
  31     sys.exit(-1)
  32
  33 from functools import partial
  34
  35 import signal
  36 signal.signal(signal.SIGINT, signal.SIG_DFL)
  37 SYNC_TIMEOUT = 4*1000
  38
  39 CORE_PATH = "/org/pulseaudio/core1"
  40 CORE_IFACE = "org.PulseAudio.Core1"
  41 def connect():
  42     try:
  43         if 'PULSE_DBUS_SERVER' in os.environ:
  44             address = os.environ['PULSE_DBUS_SERVER']
  45         else:
  46             bus = dbus.SessionBus() # Should be UserBus, but D-Bus doesn't implement that yet.
  47             server_lookup = bus.get_object('org.PulseAudio1', '/org/pulseaudio/server_lookup1')
  48             address = server_lookup.Get('org.PulseAudio.ServerLookup1', 'Address', dbus_interface='org.freedesktop.DBus.Properties')
  49         return dbus.connection.Connection(address)
  50     except Exception,e:
  51         print 'There was an error connecting to pulseaudio, please make sure you have the pulseaudio dbus'
  52         print 'and equalizer modules loaded, exiting...'
  53         import sys
  54         sys.exit(-1)
  55
  56
  57 #TODO: signals: sink Filter changed, sink reconfigured (window size) (sink iface)
  58 #TODO: manager signals: new sink, removed sink, new profile, removed profile
  59 #TODO: add support for changing of window_size 1000-fft_size (adv option)
  60 #TODO: reconnect support loop 1 second trying to reconnect
  61 #TODO: just resample the filters for profiles when loading to different sizes
  62 #TODO: add preamp
  63 prop_iface='org.freedesktop.DBus.Properties'
  64 eq_iface='org.PulseAudio.Ext.Equalizing1.Equalizer'
  65 device_iface='org.PulseAudio.Core1.Device'
  66 class QPaeq(QtGui.QWidget):
  67     manager_path='/org/pulseaudio/equalizing1'
  68     manager_iface='org.PulseAudio.Ext.Equalizing1.Manager'
  69     core_iface='org.PulseAudio.Core1'
  70     core_path='/org/pulseaudio/core1'
  71     def __init__(self):
  72         QtGui.QWidget.__init__(self)
  73         self.setWindowTitle('qpaeq')
  74         self.slider_widget=None
  75         self.sink_name=None
  76         self.filter_state=None
  77
  78         self.create_layout()
  79
  80         self.set_connection()
  81         self.connect_to_sink(self.sinks[0])
  82         self.set_callbacks()
  83         self.setMinimumSize(self.sizeHint())
  84
  85     def create_layout(self):
  86         self.main_layout=QtGui.QVBoxLayout()
  87         self.setLayout(self.main_layout)
  88         toprow_layout=QtGui.QHBoxLayout()
  89         sizePolicy = QtGui.QSizePolicy(QtGui.QSizePolicy.Preferred, QtGui.QSizePolicy.Fixed)
  90         sizePolicy.setHorizontalStretch(0)
  91         sizePolicy.setVerticalStretch(0)
  92         #sizePolicy.setHeightForWidth(self.profile_box.sizePolicy().hasHeightForWidth())
  93
  94         toprow_layout.addWidget(QtGui.QLabel('Sink'))
  95         self.sink_box = QtGui.QComboBox()
  96         self.sink_box.setSizePolicy(sizePolicy)
  97         self.sink_box.setDuplicatesEnabled(False)
  98         self.sink_box.setInsertPolicy(QtGui.QComboBox.InsertAlphabetically)
  99         #self.sink_box.setSizeAdjustPolicy(QtGui.QComboBox.AdjustToContents)
 100         toprow_layout.addWidget(self.sink_box)
 101
 102         toprow_layout.addWidget(QtGui.QLabel('Channel'))
 103         self.channel_box = QtGui.QComboBox()
 104         self.channel_box.setSizePolicy(sizePolicy)
 105         toprow_layout.addWidget(self.channel_box)
 106
 107         toprow_layout.addWidget(QtGui.QLabel('Preset'))
 108         self.profile_box = QtGui.QComboBox()
 109         self.profile_box.setSizePolicy(sizePolicy)
 110         self.profile_box.setInsertPolicy(QtGui.QComboBox.InsertAlphabetically)
 111         #self.profile_box.setSizeAdjustPolicy(QtGui.QComboBox.AdjustToContents)
 112         toprow_layout.addWidget(self.profile_box)
 113
 114         large_icon_size=self.style().pixelMetric(QtGui.QStyle.PM_LargeIconSize)
 115         large_icon_size=QtCore.QSize(large_icon_size,large_icon_size)
 116         save_profile=QtGui.QToolButton()
 117         save_profile.setIcon(self.style().standardIcon(QtGui.QStyle.SP_DriveFDIcon))
 118         save_profile.setIconSize(large_icon_size)
 119         save_profile.setToolButtonStyle(QtCore.Qt.ToolButtonIconOnly)
 120         save_profile.clicked.connect(self.save_profile)
 121         remove_profile=QtGui.QToolButton()
 122         remove_profile.setIcon(self.style().standardIcon(QtGui.QStyle.SP_TrashIcon))
 123         remove_profile.setIconSize(large_icon_size)
 124         remove_profile.setToolButtonStyle(QtCore.Qt.ToolButtonIconOnly)
 125         remove_profile.clicked.connect(self.remove_profile)
 126         toprow_layout.addWidget(save_profile)
 127         toprow_layout.addWidget(remove_profile)
 128
 129         reset_button = QtGui.QPushButton('Reset')
 130         reset_button.clicked.connect(self.reset)
 131         toprow_layout.addStretch()
 132         toprow_layout.addWidget(reset_button)
 133         self.layout().addLayout(toprow_layout)
 134
 135         self.profile_box.activated.connect(self.load_profile)
 136         self.channel_box.activated.connect(self.select_channel)
 137     def connect_to_sink(self,name):
 138         #TODO: clear slots for profile buttons
 139
 140         #flush any pending saves for other sinks
 141         if self.filter_state is not None:
 142             self.filter_state.flush_state()
 143         sink=self.connection.get_object(object_path=name)
 144         self.sink_props=dbus.Interface(sink,dbus_interface=prop_iface)
 145         self.sink=dbus.Interface(sink,dbus_interface=eq_iface)
 146         self.filter_state=FilterState(sink)
 147         #sample_rate,filter_rate,channels,channel)
 148
 149         self.channel_box.clear()
 150         self.channel_box.addItem('All',self.filter_state.channels)
 151         for i in xrange(self.filter_state.channels):
 152             self.channel_box.addItem('%d' %(i+1,),i)
 153         self.setMinimumSize(self.sizeHint())
 154
 155         self.set_slider_widget(SliderArray(self.filter_state))
 156
 157         self.sink_name=name
 158         #set the signal listener for this sink
 159         core=self._get_core()
 160         #temporary hack until signal filtering works properly
 161         core.ListenForSignal('',[dbus.ObjectPath(self.sink_name),dbus.ObjectPath(self.manager_path)])
 162         #for x in ['FilterChanged']:
 163         #    core.ListenForSignal("%s.%s" %(self.eq_iface,x),[dbus.ObjectPath(self.sink_name)])
 164         #core.ListenForSignal(self.eq_iface,[dbus.ObjectPath(self.sink_name)])
 165         self.sink.connect_to_signal('FilterChanged',self.read_filter)
 166
 167     def set_slider_widget(self,widget):
 168         layout=self.layout()
 169         if self.slider_widget is not None:
 170             i=layout.indexOf(self.slider_widget)
 171             layout.removeWidget(self.slider_widget)
 172             self.slider_widget.deleteLater()
 173             layout.insertWidget(i,self.slider_widget)
 174         else:
 175             layout.addWidget(widget)
 176         self.slider_widget=widget
 177         self.read_filter()
 178     def _get_core(self):
 179         core_obj=self.connection.get_object(object_path=self.core_path)
 180         core=dbus.Interface(core_obj,dbus_interface=self.core_iface)
 181         return core
 182     def sink_added(self,sink):
 183         #TODO: preserve selected sink
 184         self.update_sinks()
 185     def sink_removed(self,sink):
 186         #TODO: preserve selected sink, try connecting to backup otherwise
 187         if sink==self.sink_name:
 188             #connect to new sink?
 189             pass
 190         self.update_sinks()
 191     def save_profile(self):
 192         #popup dialog box for name
 193         current=self.profile_box.currentIndex()
 194         profile,ok=QtGui.QInputDialog.getItem(self,'Preset Name','Preset',self.profiles,current)
 195         if not ok or profile=='':
 196             return
 197         if profile in self.profiles:
 198             mbox=QtGui.QMessageBox(self)
 199             mbox.setText('%s preset already exists'%(profile,))
 200             mbox.setInformativeText('Do you want to save over it?')
 201             mbox.setStandardButtons(mbox.Save|mbox.Discard|mbox.Cancel)
 202             mbox.setDefaultButton(mbox.Save)
 203             ret=mbox.exec_()
 204             if ret!=mbox.Save:
 205                 return
 206         self.sink.SaveProfile(self.filter_state.channel,dbus.String(profile))
 207         if self.filter_state.channel==self.filter_state.channels:
 208             for x in range(1,self.filter_state.channels):
 209                 self.sink.LoadProfile(x,dbus.String(profile))
 210     def remove_profile(self):
 211         #find active profile name, remove it
 212         profile=self.profile_box.currentText()
 213         manager=dbus.Interface(self.manager_obj,dbus_interface=self.manager_iface)
 214         manager.RemoveProfile(dbus.String(profile))
 215     def load_profile(self,x):
 216         profile=self.profile_box.itemText(x)
 217         self.filter_state.load_profile(profile)
 218     def select_channel(self,x):
 219         self.filter_state.channel = self.channel_box.itemData(x).toPyObject()
 220         self._set_profile_name()
 221         self.filter_state.readback()
 222
 223     #TODO: add back in preamp!
 224     #print frequencies
 225     #main_layout.addLayout(self.create_slider(partial(self.update_coefficient,0),
 226     #    'Preamp')[0]
 227     #)
 228     def set_connection(self):
 229         self.connection=connect()
 230         self.manager_obj=self.connection.get_object(object_path=self.manager_path)
 231         manager_props=dbus.Interface(self.manager_obj,dbus_interface=prop_iface)
 232         self.sinks=manager_props.Get(self.manager_iface,'EqualizedSinks')
 233     def set_callbacks(self):
 234         manager=dbus.Interface(self.manager_obj,dbus_interface=self.manager_iface)
 235         manager.connect_to_signal('ProfilesChanged',self.update_profiles)
 236         manager.connect_to_signal('SinkAdded',self.sink_added)
 237         manager.connect_to_signal('SinkRemoved',self.sink_removed)
 238         #self._get_core().ListenForSignal(self.manager_iface,[])
 239         #self._get_core().ListenForSignal(self.manager_iface,[dbus.ObjectPath(self.manager_path)])
 240         #core=self._get_core()
 241         #for x in ['ProfilesChanged','SinkAdded','SinkRemoved']:
 242         #    core.ListenForSignal("%s.%s" %(self.manager_iface,x),[dbus.ObjectPath(self.manager_path)])
 243         self.update_profiles()
 244         self.update_sinks()
 245     def update_profiles(self):
 246         #print 'update profiles called!'
 247         manager_props=dbus.Interface(self.manager_obj,dbus_interface=prop_iface)
 248         self.profiles=manager_props.Get(self.manager_iface,'Profiles')
 249         self.profile_box.blockSignals(True)
 250         self.profile_box.clear()
 251         self.profile_box.addItems(self.profiles)
 252         self.profile_box.blockSignals(False)
 253         self._set_profile_name()
 254     def update_sinks(self):
 255         self.sink_box.blockSignals(True)
 256         self.sink_box.clear()
 257         for x in self.sinks:
 258             sink=self.connection.get_object(object_path=x)
 259             sink_props=dbus.Interface(sink,dbus_interface=prop_iface)
 260             simple_name=sink_props.Get(device_iface,'Name')
 261             self.sink_box.addItem(simple_name,x)
 262         self.sink_box.blockSignals(False)
 263         self.sink_box.setMinimumSize(self.sink_box.sizeHint())
 264     def read_filter(self):
 265         #print self.filter_frequencies
 266         self.filter_state.readback()
 267     def reset(self):
 268         coefs=dbus.Array([1/math.sqrt(2.0)]*(self.filter_state.filter_rate//2+1))
 269         preamp=1.0
 270         self.filter_state.set_filter(preamp,coefs)
 271     def _set_profile_name(self):
 272         self.profile_box.blockSignals(True)
 273         profile_name=self.sink.BaseProfile(self.filter_state.channel)
 274         if profile_name is not None:
 275             i=self.profile_box.findText(profile_name)
 276             if i>=0:
 277                 self.profile_box.setCurrentIndex(i)
 278         self.profile_box.blockSignals(False)
 279
 280
 281 class SliderArray(QtGui.QWidget):
 282     def __init__(self,filter_state,parent=None):
 283         super(SliderArray,self).__init__(parent)
 284         #self.setStyleSheet('padding: 0px; border-width: 0px; margin: 0px;')
 285         #self.setStyleSheet('font-size: 7pt; font-family: monospace;'+outline%('blue'))
 286         self.filter_state=filter_state
 287         self.setLayout(QtGui.QHBoxLayout())
 288         self.sub_array=None
 289         self.set_sub_array(SliderArraySub(self.filter_state))
 290         self.inhibit_resize=0
 291     def set_sub_array(self,widget):
 292         if self.sub_array is not None:
 293             self.layout().removeWidget(self.sub_array)
 294             self.sub_array.disconnect_signals()
 295             self.sub_array.deleteLater()
 296         self.sub_array=widget
 297         self.layout().addWidget(self.sub_array)
 298         self.sub_array.connect_signals()
 299         self.filter_state.readback()
 300     def resizeEvent(self,event):
 301         super(SliderArray,self).resizeEvent(event)
 302         if self.inhibit_resize==0:
 303             self.inhibit_resize+=1
 304             #self.add_sliders_to_fit()
 305             t=QtCore.QTimer(self)
 306             t.setSingleShot(True)
 307             t.setInterval(0)
 308             t.timeout.connect(partial(self.add_sliders_to_fit,event))
 309             t.start()
 310     def add_sliders_to_fit(self,event):
 311         if event.oldSize().width()>0 and event.size().width()>0:
 312             i=len(self.filter_state.frequencies)*int(round(float(event.size().width())/event.oldSize().width()))
 313         else:
 314             i=len(self.filter_state.frequencies)
 315
 316         t_w=self.size().width()
 317         def evaluate(filter_state, target, variable):
 318             base_freqs=self.filter_state.freq_proper(self.filter_state.DEFAULT_FREQUENCIES)
 319             filter_state._set_frequency_values(subdivide(base_freqs,variable))
 320             new_widget=SliderArraySub(filter_state)
 321             w=new_widget.sizeHint().width()
 322             return w-target
 323         def searcher(initial,evaluator):
 324             i=initial
 325             def d(e): return 1 if e>=0 else -1
 326             error=evaluator(i)
 327             old_direction=d(error)
 328             i-=old_direction
 329             while True:
 330                 error=evaluator(i)
 331                 direction=d(error)
 332                 if direction!=old_direction:
 333                     k=i-1
 334                     #while direction<0 and error!=0:
 335                     #    k-=1
 336                     #    error=evaluator(i)
 337                     #    direction=d(error)
 338                     return k, evaluator(k)
 339                 i-=direction
 340                 old_direction=direction
 341         searcher(i,partial(evaluate,self.filter_state,t_w))
 342         self.set_sub_array(SliderArraySub(self.filter_state))
 343         self.inhibit_resize-=1
 344
 345 class SliderArraySub(QtGui.QWidget):
 346     def __init__(self,filter_state,parent=None):
 347         super(SliderArraySub,self).__init__(parent)
 348         self.filter_state=filter_state
 349         self.setLayout(QtGui.QGridLayout())
 350         self.slider=[None]*len(self.filter_state.frequencies)
 351         self.label=[None]*len(self.slider)
 352         #self.setStyleSheet('padding: 0px; border-width: 0px; margin: 0px;')
 353         #self.setStyleSheet('font-size: 7pt; font-family: monospace;'+outline%('blue'))
 354         qt=QtCore.Qt
 355         #self.layout().setHorizontalSpacing(1)
 356         def add_slider(slider,label, c):
 357             self.layout().addWidget(slider,0,c,qt.AlignHCenter)
 358             self.layout().addWidget(label,1,c,qt.AlignHCenter)
 359             self.layout().setColumnMinimumWidth(c,max(label.sizeHint().width(),slider.sizeHint().width()))
 360         def create_slider(slider_label):
 361             slider=QtGui.QSlider(QtCore.Qt.Vertical,self)
 362             label=SliderLabel(slider_label,filter_state,self)
 363             slider.setRange(-1000,2000)
 364             slider.setSingleStep(1)
 365             return (slider,label)
 366         self.preamp_slider,self.preamp_label=create_slider('Preamp')
 367         add_slider(self.preamp_slider,self.preamp_label,0)
 368         for i,hz in enumerate(self.filter_state.frequencies):
 369             slider,label=create_slider(self.hz2label(hz))
 370             self.slider[i]=slider
 371             #slider.setStyleSheet('font-size: 7pt; font-family: monospace;'+outline%('red',))
 372             self.label[i]=label
 373             c=i+1
 374             add_slider(slider,label,i+1)
 375     def hz2label(self, hz):
 376         if hz==0:
 377             label_text='DC'
 378         elif hz==self.filter_state.sample_rate//2:
 379             label_text='Coda'
 380         else:
 381             label_text=hz2str(hz)
 382         return label_text
 383
 384     def connect_signals(self):
 385         def connect(writer,reader,slider,label):
 386             slider.valueChanged.connect(writer)
 387             self.filter_state.readFilter.connect(reader)
 388             label_cb=partial(slider.setValue,0)
 389             label.clicked.connect(label_cb)
 390             return label_cb
 391
 392         self.preamp_writer_cb=self.write_preamp
 393         self.preamp_reader_cb=self.sync_preamp
 394         self.preamp_label_cb=connect(self.preamp_writer_cb,
 395                 self.preamp_reader_cb,
 396                 self.preamp_slider,
 397                 self.preamp_label)
 398         self.writer_callbacks=[None]*len(self.slider)
 399         self.reader_callbacks=[None]*len(self.slider)
 400         self.label_callbacks=[None]*len(self.label)
 401         for i in range(len(self.slider)):
 402             self.writer_callbacks[i]=partial(self.write_coefficient,i)
 403             self.reader_callbacks[i]=partial(self.sync_coefficient,i)
 404             self.label_callbacks[i]=connect(self.writer_callbacks[i],
 405                     self.reader_callbacks[i],
 406                     self.slider[i],
 407                     self.label[i])
 408     def disconnect_signals(self):
 409         def disconnect(writer,reader,label_cb,slider,label):
 410             slider.valueChanged.disconnect(writer)
 411             self.filter_state.readFilter.disconnect(reader)
 412             label.clicked.disconnect(label_cb)
 413         disconnect(self.preamp_writer_cb, self.preamp_reader_cb,
 414                 self.preamp_label_cb, self.preamp_slider, self.preamp_label)
 415         for i in range(len(self.slider)):
 416             disconnect(self.writer_callbacks[i],
 417                     self.reader_callbacks[i],
 418                     self.label_callbacks[i],
 419                     self.slider[i],
 420                     self.label[i])
 421
 422     def write_preamp(self, v):
 423         self.filter_state.preamp=self.slider2coef(v)
 424         self.filter_state.seed()
 425     def sync_preamp(self):
 426         self.preamp_slider.blockSignals(True)
 427         self.preamp_slider.setValue(self.coef2slider(self.filter_state.preamp))
 428         self.preamp_slider.blockSignals(False)
 429
 430
 431     def write_coefficient(self,i,v):
 432         self.filter_state.coefficients[i]=self.slider2coef(v)/math.sqrt(2.0)
 433         self.filter_state.seed()
 434     def sync_coefficient(self,i):
 435         slider=self.slider[i]
 436         slider.blockSignals(True)
 437         slider.setValue(self.coef2slider(math.sqrt(2.0)*self.filter_state.coefficients[i]))
 438         slider.blockSignals(False)
 439     @staticmethod
 440     def slider2coef(x):
 441         return (1.0+(x/1000.0))
 442     @staticmethod
 443     def coef2slider(x):
 444         return int((x-1.0)*1000)
 445 outline='border-width: 1px; border-style: solid; border-color: %s;'
 446
 447 class SliderLabel(QtGui.QLabel):
 448     clicked=QtCore.pyqtSignal()
 449     def __init__(self,label_text,filter_state,parent=None):
 450         super(SliderLabel,self).__init__(parent)
 451         self.setStyleSheet('font-size: 7pt; font-family: monospace;')
 452         self.setText(label_text)
 453         self.setMinimumSize(self.sizeHint())
 454     def mouseDoubleClickEvent(self, event):
 455         self.clicked.emit()
 456         super(SliderLabel,self).mouseDoubleClickEvent(event)
 457
 458 #until there are server side state savings, do it in the client but try and avoid
 459 #simulaneous broadcasting situations
 460 class FilterState(QtCore.QObject):
 461     #DEFAULT_FREQUENCIES=map(float,[25,50,75,100,150,200,300,400,500,800,1e3,1.5e3,3e3,5e3,7e3,10e3,15e3,20e3])
 462     DEFAULT_FREQUENCIES=[31.75,63.5,125,250,500,1e3,2e3,4e3,8e3,16e3]
 463     readFilter=QtCore.pyqtSignal()
 464     def __init__(self,sink):
 465         super(FilterState,self).__init__()
 466         self.sink_props=dbus.Interface(sink,dbus_interface=prop_iface)
 467         self.sink=dbus.Interface(sink,dbus_interface=eq_iface)
 468         self.sample_rate=self.get_eq_attr('SampleRate')
 469         self.filter_rate=self.get_eq_attr('FilterSampleRate')
 470         self.channels=self.get_eq_attr('NChannels')
 471         self.channel=self.channels
 472         self.set_frequency_values(self.DEFAULT_FREQUENCIES)
 473         self.sync_timer=QtCore.QTimer()
 474         self.sync_timer.setSingleShot(True)
 475         self.sync_timer.timeout.connect(self.save_state)
 476
 477     def get_eq_attr(self,attr):
 478         return self.sink_props.Get(eq_iface,attr)
 479     def freq_proper(self,xs):
 480         return [0]+xs+[self.sample_rate//2]
 481     def _set_frequency_values(self,freqs):
 482         self.frequencies=freqs
 483         #print 'base',self.frequencies
 484         self.filter_frequencies=map(lambda x: int(round(x)), \
 485                 self.translate_rates(self.filter_rate,self.sample_rate,
 486                     self.frequencies) \
 487                 )
 488         self.coefficients=[0.0]*len(self.frequencies)
 489         self.preamp=1.0
 490     def set_frequency_values(self,freqs):
 491         self._set_frequency_values(self.freq_proper(freqs))
 492     @staticmethod
 493     def translate_rates(dst,src,rates):
 494         return list(map(lambda x: x*dst/src,rates))
 495     def seed(self):
 496         self.sink.SeedFilter(self.channel,self.filter_frequencies,self.coefficients,self.preamp)
 497         self.sync_timer.start(SYNC_TIMEOUT)
 498     def readback(self):
 499         coefs,preamp=self.sink.FilterAtPoints(self.channel,self.filter_frequencies)
 500         self.coefficients=coefs
 501         self.preamp=preamp
 502         self.readFilter.emit()
 503     def set_filter(self,preamp,coefs):
 504         self.sink.SetFilter(self.channel,dbus.Array(coefs),self.preamp)
 505         self.sync_timer.start(SYNC_TIMEOUT)
 506     def save_state(self):
 507         print 'saving state'
 508         self.sink.SaveState()
 509     def load_profile(self,profile):
 510         self.sink.LoadProfile(self.channel,dbus.String(profile))
 511         self.sync_timer.start(SYNC_TIMEOUT)
 512     def flush_state(self):
 513         if self.sync_timer.isActive():
 514             self.sync_timer.stop()
 515             self.save_state()
 516
 517
 518 def safe_log(k,b):
 519     i=0
 520     while k//b!=0:
 521         i+=1
 522         k=k//b
 523     return i
 524 def hz2str(hz):
 525     p=safe_log(hz,10.0)
 526     if p<3:
 527         return '%dHz' %(hz,)
 528     elif hz%1000==0:
 529         return '%dKHz' %(hz/(10.0**3),)
 530     else:
 531         return '%.1fKHz' %(hz/(10.0**3),)
 532
 533 def subdivide(xs, t_points):
 534     while len(xs)<t_points:
 535         m=[0]*(2*len(xs)-1)
 536         m[0:len(m):2]=xs
 537         for i in range(1,len(m),2):
 538             m[i]=(m[i-1]+m[i+1])//2
 539         xs=m
 540     p_drop=len(xs)-t_points
 541     p_drop_left=p_drop//2
 542     p_drop_right=p_drop-p_drop_left
 543     #print 'xs',xs
 544     #print 'dropping %d, %d left, %d right' %(p_drop,p_drop_left,p_drop_right)
 545     c=len(xs)//2
 546     left=xs[0:p_drop_left*2:2]+xs[p_drop_left*2:c]
 547     right=list(reversed(xs[c:]))
 548     right=right[0:p_drop_right*2:2]+right[p_drop_right*2:]
 549     right=list(reversed(right))
 550     return left+right
 551
 552 def main():
 553     dbus.mainloop.qt.DBusQtMainLoop(set_as_default=True)
 554     app=QtGui.QApplication(sys.argv)
 555     qpaeq_main=QPaeq()
 556     qpaeq_main.show()
 557     sys.exit(app.exec_())
 558
 559 if __name__=='__main__':
 560     main()