[pygame] mixer/sndarray voes

[Olof Bjarnason <olof.bjarnason@xxxxxxxxx>]

OS: Ubuntu 9.04
Python: 2.6.2
PyGame: 1.8.1release

I'm trying to generate some sounds with pygame.

I was hindered some by how to use sndarray - but it all got easier
once I set the mixer-init to easy/retro defaults.

The first experiment was to just play a "sawtooth" wave:

<code src="sndtest.py">
import pygame
import Numeric

pygame.mixer.pre_init(11025,8,1,4096) #mono, unsigned, 8-bit sound. C64 ;)
pygame.init()
print pygame.mixer.get_init() # to make sure I got what I wanted, just
watch stdout

pygame.sndarray.make_sound(Numeric.array(range(250)*100)).play()

while pygame.mixer.get_busy():
	pygame.time.wait(200)
</code>

'python sndtest.py' produces slightly different audio each time.

I improved readability a little, to find out where I did go wrong, and
to my great surprise, this *silenced* my speakers:

<code src="sndtest2.py">
import pygame
import Numeric

pygame.mixer.pre_init(11025,8,1,4096) #mono, unsigned, 8-bit sound. C64 ;)
pygame.init()
print pygame.mixer.get_init() # to make sure I got what I wanted, just
watch stdout

seq = range(250)*100
na = Numeric.array(seq)
snd = pygame.sndarray.make_sound(na)
snd.play()

while pygame.mixer.get_busy():
	pygame.time.wait(200)
</code>

'python sndtest2.py' only produces a low-volume "spark" then nothing
each time run.

What am I doing wrong here? There is no randomness in 'sndtest.py',
and 'sndtest2.py' should at least produce the same output, afaiks.

-- 
twitter.com/olofb
olofb.wordpress.com