PYQT basic exercise (Google search)

"' ps_multimedia_play_sound1.py

Explore the Pyside Qtmultimedia module to play a specified sound

Modified PyQT code from:

Http://www.diotavelli.net/PyQtWiki/Playing%20a%20sound%20with%20QtMultimedia

Pyside is the official lgpl-licensed version of PyQT

For free pyside Windows installers See:

Http://developer.qt.nokia.com/wiki/PySide_Binaries_Windows

Or

http://www.lfd.uci.edu/~gohlke/pythonlibs/

Tested with Python33 and Pyside112 by Vegaseat 29jul2013

‘‘‘

From Pyqt4.qtcore Import *

From Pyqt4.qtgui Import *

From Pyqt4.qtmultimedia Import *

From math import pi, sin

Import struct

Class Window (Qwidget):

def __init__ (self, parent = None):

Qwidget.__init__ (self, parent)

# setgeometry (X_pos, Y_pos, width, height)

Self.setgeometry (300, 300, 400, 80)

Self.setwindowtitle ("Play a specified sound (2 seconds)")

format = Qaudioformat ()

Format.setchannels (1)

Format.setfrequency (22050)

Format.setsamplesize (16)

Format.setcodec ("AUDIO/PCM")

Format.setbyteorder (Qaudioformat.littleendian)

Format.setsampletype (Qaudioformat.signedint)

Self.output = qaudiooutput (format, self)

self.frequency = 100

Self.volume = 15000

Self.buffer = Qbuffer ()

Self.data = Qbytearray ()

Self.pitchslider = Qslider (qt.horizontal)

Self.pitchSlider.setMaximum (2000)

Self.volumeslider = Qslider (qt.horizontal)

Self.volumeSlider.setMaximum (32767)

Self.volumeSlider.setPageStep (1024)

Self.volumeSlider.setValue (Self.volume)

Self.playbutton = Qpushbutton ("&play")

Self.pitch_label = Qlabel ()

Self.pitchSlider.valueChanged.connect (self.changefrequency)

Self.volumeSlider.valueChanged.connect (Self.changevolume)

Self.playButton.clicked.connect (Self.play)

# Layout Managers ...

Formlayout = Qformlayout ()

Formlayout.addrow ("P&itch:", Self.pitchslider)

Formlayout.addrow ("&volume:", Self.volumeslider)

Buttonlayout = Qvboxlayout ()

Buttonlayout.addwidget (Self.pitch_label)

Buttonlayout.addwidget (Self.playbutton)

Buttonlayout.addstretch ()

Horizontallayout = Qhboxlayout (self)

Horizontallayout.addlayout (Formlayout)

Horizontallayout.addlayout (Buttonlayout)

Self.changefrequency ()

def changefrequency (self, value=0):

Self.frequency = + (value * 2)

s = "pitch = {} Hz". Format (self.frequency)

Self.pitch_label.setText (s)

def play (self):

If self.output.state () = = Qaudio.activestate:

Self.output.stop ()

If Self.buffer.isOpen ():

Self.buffer.close ()

Self.createdata ()

Self.buffer.setData (Self.data)

Self.buffer.open (qiodevice.readonly)

Self.buffer.seek (0)

Self.output.start (Self.buffer)

def changevolume (self, value):

Self.volume = value

def createdata (self):

‘‘‘

Create 2 seconds of data with 22050 samples per second,

Each sample being Bits (2 bytes)

‘‘‘

Self.data.clear ()

for k in range (2 * 22050):

t = k/22050.0

value = Int (Self.volume * sin (2 * pi * self.frequency * t))

Self.data.append (Struct.pack ("

# Test the module

if __name__ = = "__main__":

App = Qapplication ([])

window = window ()

Window.show ()

APP.EXEC_ ()

PYQT basic exercise (Google search)