Accessing sound data (Simple)

A good game needs to have great music and sound effects. The Pygame mixer module lets us play a sound or any audio for that matter.

How to do it...

We will download a WAV audio file using standard Python. We will play this sound when the game quits. This example requires you to actually execute the example code, because this book has no audio support.

  1. Creating a sound object: We can create a Pygame Sound object after specifying the name of the audio file. This class as you would expect embodies the concept of sounds:
    audio = pygame.mixer.Sound(WAV_FILE)
  2. Playing the sound: The Sound object has a play method, which has a number of loops parameters. If the value of this parameter is set to -1, the sound will loop indefinitely:
    audio.play(-1)
  3. Pausing the game: Sometimes we need to pause the execution of a game, as in our case in order to be able to hear a sound. We can do this with the following code snippet:
    pygame.time.delay(TIMEOUT * 1000)

    The delay is specified in milliseconds, that's why we are multiplying by 1000.

  4. Stopping the sound: After a while we need to stop the sound with the corresponding stop method:
    audio.stop()

    The audio demo code is listed as follows:

    import pygame, sys
from pygame.locals import *
import numpy
import urllib2
import time

WAV_FILE = 'smashingbaby.wav'

def play():
    audio = pygame.mixer.Sound(WAV_FILE)
    audio.play(-1)
    TIMEOUT = 1
    pygame.time.delay(TIMEOUT * 1000)
    audio.stop()
    time.sleep(TIMEOUT)

pygame.init()
pygame.display.set_caption('Sound Demo')
response = urllib2.urlopen('http://www.thesoundarchive.com/austinpowers/smashingbaby.wav')
filehandle = open(WAV_FILE, 'w')
filehandle.write(response.read())
filehandle.close()
screen = pygame.display.set_mode((400, 400))

while True: 
   sys_font = pygame.font.SysFont("None", 19)
   rendered = sys_font.render('Smashing Baby', 0, (255, 100, 100))
   screen.blit(rendered, (100, 100))

   for event in pygame.event.get():
      if event.type == QUIT:
         play()
         pygame.quit()
         sys.exit()

   pygame.display.update()

How it works...

The most important functions of this demo are summed up in the following table:

Function

Description

pygame.mixer.Sound(WAV_FILE)

This function creates a Sound object given a filename.

audio.play(-1)

This function plays and loops indefinitely (-1 means indefinitely). By default the sound is played only once. This corresponds with 0 loops. If the value is 2, the sound will be played once and then repeated 2 more times.

pygame.time.delay(TIMEOUT * 1000)

This function pauses the game for a specified number of milliseconds.

audio.stop()

This function stops audio playback.

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