Archived:How to play a tone sound using PySymbian

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20 Sep
2009

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23 Sep
2009

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Aquivado: Este artigo foi arquivado, pois o conteúdo não é mais considerado relevante para se criar soluções comerciais atuais. Se você achar que este artigo ainda é importante, inclua o template {{ForArchiveReview|escreva a sua justificativa}}.

All PySymbian articles have been archived. PySymbian is no longer maintained by Nokia and is not guaranteed to work on more recent Symbian devices. It is not possible to submit apps to Nokia Store.

Article Metadata

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Tested with

Devices(s): Nokia N95, Nokia E90

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Compatibility

Platform(s): S60 1st Edition, S60 2nd Edition, S60 3rd Edition

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Article

Keywords: audio

Created: cyke64 (31 Mar 2007)

Last edited: hamishwillee (08 May 2013)

Overview

This snippet shows how to play a tone in Python.

Source code

from struct import pack
from math import sin, pi
import e32, audio
 
 
#Function for generating a tone file
def au_file(name="out.au", freq=400, length=2, A=0.5):
	f = open(name, 'wb')
	f.write('.snd')
	f.write(pack('>5L', 24, -1, 2, 8000, 1))
	T = 8000. / freq
	for i in range(length * 8000):
		angle = 2 * pi * i / T
		val = pack('b', A * sin(angle) * 127)
		f.write(val)
	f.close()
 
#Function for playing the tone file
def tone(freq=440, duration=1000, volume=0.5):
	#Read the temporary file
	f = open("D:\\out.au", 'wb')
	f.write('.snd' + pack('>5L', 24, 8 * duration, 2, 8000, 1))
	for i in range(duration * 8):
		sin_i = sin(i * 2 * pi * freq / 8000) #Sine wave
		f.write(pack('b', volume * 127 * sin_i))
	f.close()
	#Play the file
	s = audio.Sound.open("D:\\out.au")
	s.play()
	while s.state() == 2: #Playing
		e32.ao_yield()
	s.close()
 
au_file()
tone()

Postconditions

A sound with the given properties is played.