Re: [pygame] noob questions about creating and playing sounds
For the crackle, are you using the latest version of pygame? I know a certain version had problems on win32. On Wed, Jul 22, 2009 at 12:32 AM, Ian Mallett geometr...@gmail.com wrote: Hi again, Hmmm, the note of your original approach is the same, but the timbre is different. Mine matches a sine wave made with Audacity for tone. I notice mine has less crackle than the original--but it's still there. The issue then is that crackle... I thought the issue might be the buffer size. (the buffer size default for pre_init is 0, while for init it 3072. I don't know if the pre_init changes anything that way. Changing it didn't work, however. As an aside, pygame.sndarray.samples(...) doesn't seem to work unless the mixer is intitialized in stereo... I looked at the array manually, but didn't notice anything weird--although there's A LOT of values... It's good you got a solution though. Ian -- Jake
Re: [pygame] noob questions about creating and playing sounds
On Wed, Jul 22, 2009 at 12:46 PM, Jake bninmonk...@gmail.com wrote: For the crackle, are you using the latest version of pygame? I know a certain version had problems on win32. I am using: * Pygame 1.8.1 * Python 2.6.2 * Xubuntu 9.04 Jaunty Jackalope * Linux 2.6.28-13.45 * ALSA 1.0.18 It would be interesting to know, if the posted code examples produce that noise on your machine :)
Re: [pygame] noob questions about creating and playing sounds
On Wed, Jul 22, 2009 at 10:25 AM, Jerzy Jalocha N jjalo...@gmail.comwrote: I am using: * Pygame 1.8.1 * Python 2.6.2 * Xubuntu 9.04 Jaunty Jackalope * Linux 2.6.28-13.45 * ALSA 1.0.18 I am using PyGame 1.8.1 Python 2.5.4 Vista (Win32)
Re: [pygame] noob questions about creating and playing sounds
Hi again, Hmmm, the note of your original approach is the same, but the timbre is different. Mine matches a sine wave made with Audacity for tone. I notice mine has less crackle than the original--but it's still there. The issue then is that crackle... I thought the issue might be the buffer size. (the buffer size default for pre_init is 0, while for init it 3072. I don't know if the pre_init changes anything that way. Changing it didn't work, however. As an aside, pygame.sndarray.samples(...) doesn't seem to work unless the mixer is intitialized in stereo... I looked at the array manually, but didn't notice anything weird--although there's A LOT of values... It's good you got a solution though. Ian
[pygame] noob questions about creating and playing sounds
Hi, I am starting to experiment with Pygame and how to generate sounds
and play them back. Here is a code snippet, the full (working) code is
below.
def play_maxtime(sound, duration):
sound.play(loops=-1, maxtime=duration)
pygame.time.delay(duration)
I have a few questions about this:
* Why is it that play_maxtime doesn't work without the time.delay?
When I remove the delay line, no sound is played, despite the use of
the maxtime argument.
* Why does this sound so ugly? This method (and play_loops below)
produces a terrible rattle, regardless the sample-rate. (Note, that I
am using 16 bit, which should produce at least decent quality. And it
is not clipping.)
* Anyone knows how to create the sound in real-time, and feed it to
the sound card? For example, make the frequency depend on the mouse
position.
Since it is quite difficult to find information and examples about how
to create and play back sounds in Python and Pygame, I am posting the
complete working example below, for reference. Maybe other noobs might
find it useful. This code was adapted from a post on other mailing
list: http://mail.python.org/pipermail/tutor/2009-March/067724.html
import numpy
import pygame
# Create the sound wave in the required bit-rate.
def sine_array(freq, amplitude, sample_rate):
wavelength = sample_rate / freq
omega = 2 * numpy.pi / wavelength
xvalues = numpy.arange(wavelength) * omega
return numpy.int16(amplitude * numpy.sin(xvalues))
# Two different methods for playing the sound.
def play_maxtime(sound, duration):
sound.play(loops=-1, maxtime=duration)
pygame.time.delay(duration)
def play_loops(sound, duration):
sound.play(loops=-1)
pygame.time.delay(duration)
sound.stop()
# Initialize PyGame PyGame sound system.
sample_rate, bit_rate, channels = 22050, -16, 1
pygame.mixer.pre_init(sample_rate, bit_rate, channels)
pygame.init()
sample_rate, bit_rate, channels = pygame.mixer.get_init()
assert bit_rate == -16 # sine_array only implements 16 bit signed
pygame.sndarray.use_arraytype('numpy')
# Create a sound array, and convert it to a Sound object.
sound_array = sine_array(440, 2, sample_rate)
sound = pygame.sndarray.make_sound(sound_array)
# Play the sound using two different methods.
duration = 2000
play_maxtime(sound, duration)
pygame.time.delay(duration)
play_loops(sound, duration)
Re: [pygame] noob questions about creating and playing sounds
code gets all gibberishy in the message itself attatch the .py file(s) to the
message
From: Jerzy Jalocha N jjalo...@gmail.com
To: pygame-users pygame-users@seul.org
Sent: Monday, July 20, 2009 8:44:45 AM
Subject: [pygame] noob questions about creating and playing sounds
Hi, I am starting to experiment with Pygame and how to generate sounds
and play them back. Here is a code snippet, the full (working) code is
below. def play_maxtime(sound, duration): sound.play(loops=-1,
maxtime=duration) pygame.time.delay(duration) I have a few questions about
this: * Why is it that play_maxtime doesn't work without the time.delay?
When I remove the delay line, no sound is played, despite the use of
the maxtime argument. * Why does this sound so ugly? This method (and
play_loops below)
produces a terrible rattle, regardless the sample-rate. (Note, that I
am using 16 bit, which should produce at least decent quality. And it
is not clipping.) * Anyone knows how to create the sound in real-time, and feed
it to
the sound card? For example, make the frequency depend on the mouse
position. Since it is quite difficult to find information and examples about how
to create and play back sounds in Python and Pygame, I am posting the
complete working example below, for reference. Maybe other noobs might
find it useful. This code was adapted from a post on other mailing
list: http://mail.python.org/pipermail/tutor/2009-March/067724.html import numpy
import pygame # Create the sound wave in the required bit-rate.
def sine_array(freq, amplitude, sample_rate): wavelength = sample_rate / freq
omega = 2 * numpy.pi / wavelength xvalues = numpy.arange(wavelength) * omega
return numpy.int16(amplitude * numpy.sin(xvalues)) # Two different methods for
playing the sound.
def play_maxtime(sound, duration): sound.play(loops=-1, maxtime=duration)
pygame.time.delay(duration) def play_loops(sound, duration):
sound.play(loops=-1) pygame.time.delay(duration) sound.stop() # Initialize
PyGame PyGame sound system.
sample_rate, bit_rate, channels = 22050, -16, 1
pygame.mixer.pre_init(sample_rate, bit_rate, channels)
pygame.init()
sample_rate, bit_rate, channels = pygame.mixer.get_init()
assert bit_rate == -16 # sine_array only implements 16 bit signed
pygame.sndarray.use_arraytype('numpy') # Create a sound array, and convert it
to a Sound object.
sound_array = sine_array(440, 2, sample_rate)
sound = pygame.sndarray.make_sound(sound_array) # Play the sound using two
different methods.
duration = 2000
play_maxtime(sound, duration)
pygame.time.delay(duration)
play_loops(sound, duration)
Re: [pygame] noob questions about creating and playing sounds
On Mon, Jul 20, 2009 at 9:55 AM, Yanom Mobisya...@rocketmail.com wrote:
code gets all gibberishy in the message itself attatch the .py file(s) to
the message
Oops, sorry, I didn't know that!
I forgot to mention, that I am running Python 2.6.6 under Linux. I can
provide further information if necessary.
#! /usr/bin/env python
import numpy
import pygame
# Create the sound wave in the required bit-rate.
def sine_array(freq, amplitude, sample_rate):
wavelength = sample_rate / freq
omega = 2 * numpy.pi / wavelength
xvalues = numpy.arange(wavelength) * omega
return numpy.int16(amplitude * numpy.sin(xvalues))
# Two different methods for playing the sound.
def play_maxtime(sound, duration):
sound.play(loops=-1, maxtime=duration)
pygame.time.delay(duration)
def play_loops(sound, duration):
sound.play(loops=-1)
pygame.time.delay(duration)
sound.stop()
# Initialize PyGame PyGame sound system.
sample_rate, bit_rate, channels = 22050, -16, 1
pygame.mixer.pre_init(sample_rate, bit_rate, channels)
pygame.init()
sample_rate, bit_rate, channels = pygame.mixer.get_init()
assert bit_rate == -16 # sine_array only implements 16 bit signed
pygame.sndarray.use_arraytype('numpy')
# Create a sound array, and convert it to a Sound object.
sound_array = sine_array(440, 2, sample_rate)
sound = pygame.sndarray.make_sound(sound_array)
# Play the sound using two different methods.
duration = 2000
play_maxtime(sound, duration)
pygame.time.delay(duration)
play_loops(sound, duration)
Re: [pygame] noob questions about creating and playing sounds
On Mon, Jul 20, 2009 at 09:44:45AM -0400, Jerzy Jalocha N wrote: Hi, I am starting to experiment with Pygame and how to generate sounds and play them back. Here is a code snippet, the full (working) code is below. def play_maxtime(sound, duration): sound.play(loops=-1, maxtime=duration) pygame.time.delay(duration) I have a few questions about this: * Why is it that play_maxtime doesn't work without the time.delay? When I remove the delay line, no sound is played, despite the use of the maxtime argument. Because without that the program finishes and quits. You would not need the time.delay if you were using this in a game, since you would be playing your sounds inside the game's loop. --- James Paige
Re: [pygame] noob questions about creating and playing sounds
just a question: afaik, since Pygame uses SDL, Pygame only can play sounds were loaded, and the only way to 'create' (one of the questions of this mailinglist post) sounds is writing binary data into a .raw file, and calling SoX for converting it as .ogg, .wav, etc.? On 7/20/09, Jerzy Jalocha N jjalo...@gmail.com wrote: On Mon, Jul 20, 2009 at 9:55 AM, Yanom Mobisya...@rocketmail.com wrote: code gets all gibberishy in the message itself attatch the .py file(s) to the message Oops, sorry, I didn't know that! I forgot to mention, that I am running Python 2.6.6 under Linux. I can provide further information if necessary.
Re: [pygame] noob questions about creating and playing sounds
On Mon, Jul 20, 2009 at 6:44 AM, Jerzy Jalocha N jjalo...@gmail.com wrote: def play_maxtime(sound, duration): sound.play(loops=-1, maxtime=duration) pygame.time.delay(duration) I have a few questions about this: * Why is it that play_maxtime doesn't work without the time.delay? When I remove the delay line, no sound is played, despite the use of the maxtime argument. Make sure you aren't calling it repeatedly. I once had a problem like this that was solved by not calling the sound repeatedly. What can happen is that the auto-channels will get filled with queued sounds, and won't have a chance to play before being called again. This may or may not be your problem.
Re: [pygame] noob questions about creating and playing sounds
def play_maxtime(sound, duration): sound.play(loops=-1, maxtime=duration) pygame.time.delay(duration) I have a few questions about this: * Why is it that play_maxtime doesn't work without the time.delay? When I remove the delay line, no sound is played, despite the use of the maxtime argument. Because without that the program finishes and quits. You would not need the time.delay if you were using this in a game, since you would be playing your sounds inside the game's loop. OK, thanks, James! This shouldn't be a problem, then, if I succeed in somehow creating reproducing the sound in real-time, inside some kind main() loop. That was actually the third question in my original post: * Anyone knows how to create the sound in real-time, and feed it to the sound card? For example, make the frequency depend on the mouse position.
Re: [pygame] noob questions about creating and playing sounds
On Mon, Jul 20, 2009 at 11:52 AM, Paulo Silvanitrofur...@gmail.com wrote:
just a question: afaik, since Pygame uses SDL, Pygame only can play
sounds were loaded, and the only way to 'create' (one of the questions
of this mailinglist post) sounds is writing binary data into a .raw
file, and calling SoX for converting it as .ogg, .wav, etc.?
Paulo, I am not sure if I understand you correctly. The posted code
actually 'creates' the sound, (a numpy array with a sine curve),
converts it into a mixer.Sound object, and plays that back. This path
without .ogg or .wav files is exactly what I am looking for.
It just fails partially, because it creates a horrible rattle noise.
And I am unable to discover where the noise comes from. (The data
curve is smooth, and no clipping occurs. I also tried using longer
arrays with many cycles of my curve.)
What I am not sure if it can be done (or how), is to create the sound
in real-time, and play that back. As an example, make the sound's
frequency and amplitude depend on the mouse pointer's position. But
maybe this is a limitation of the SDL?
Thanks!
#! /usr/bin/env python
import numpy
import pygame
# Create the sound wave in the required bit-rate.
def sine_array(freq, amplitude, sample_rate):
wavelength = sample_rate / freq
omega = 2 * numpy.pi / wavelength
xvalues = numpy.arange(wavelength) * omega
return numpy.int16(amplitude * numpy.sin(xvalues))
# Two different methods for playing the sound.
def play_maxtime(sound, duration):
sound.play(loops=-1, maxtime=duration)
pygame.time.delay(duration)
def play_loops(sound, duration):
sound.play(loops=-1)
pygame.time.delay(duration)
sound.stop()
# Initialize PyGame PyGame sound system.
sample_rate, bit_rate, channels = 22050, -16, 1
pygame.mixer.pre_init(sample_rate, bit_rate, channels)
pygame.init()
sample_rate, bit_rate, channels = pygame.mixer.get_init()
assert bit_rate == -16 # sine_array only implements 16 bit signed
pygame.sndarray.use_arraytype('numpy')
# Create a sound array, and convert it to a Sound object.
sound_array = sine_array(440, 2, sample_rate)
sound = pygame.sndarray.make_sound(sound_array)
# Play the sound using two different methods.
duration = 2000
play_maxtime(sound, duration)
pygame.time.delay(duration)
play_loops(sound, duration)
Re: [pygame] noob questions about creating and playing sounds
.play() with no arguments just plays the whole sound once.
I fixed the problem, I think. The issue is in the way the sound is
created. There's sometimes a bit of static-ey stuff in there on my system
which I don't have time to track down right now. Hope it helps,
Ian
#! /usr/bin/env python
import numpy
import pygame
# Create the sound wave in the required bit-rate.
def sine_array(freq, amplitude, sample_rate):
#length, in samples, of a single wave
wavelength = float(sample_rate)/float(freq)
#scale of 0.0 to 1.0
samples = numpy.array(numpy.arange(sample_rate+1),f)/float(sample_rate)
#how many repeats of the wave
repeats = sample_rate/wavelength
#radians
omega = repeats*2.0*numpy.pi
#sinusoidal samples
samples = sample_rate*amplitude*numpy.sin(samples*omega)
#convert to bitrate
samples = numpy.array(samples,int16)
#return
return samples
# Two different methods for playing the sound.
def play_maxtime(sound, duration):
sound.play(loops=-1, maxtime=duration)
pygame.time.delay(duration)
def play_loops(sound, duration):
sound.play(loops=-1)
pygame.time.delay(duration)
sound.stop()
# Initialize PyGame PyGame sound system.
sample_rate, bit_rate, channels = 22050, -16, 1
pygame.mixer.pre_init(sample_rate, bit_rate, channels)
pygame.init()
sample_rate, bit_rate, channels = pygame.mixer.get_init()
pygame.sndarray.use_arraytype('numpy')
# Create a sound array, and convert it to a Sound object.
sound_array = sine_array(440, 1.0, sample_rate)
sound = pygame.sndarray.make_sound(sound_array)
# Play the sound using two different methods.
duration = 2000
play_maxtime(sound, duration)
pygame.time.delay(duration)
play_loops(sound, duration)
Re: [pygame] noob questions about creating and playing sounds
I fixed the problem, I think. The issue is in the way the sound is created. There's sometimes a bit of static-ey stuff in there on my system which I don't have time to track down right now. Hope it helps, Thank you, Ian, for the correction. You are right, that my math was not correct. I was producing 22000 samples for one second instead of 22050. I also appreciate the normalized amplitude. But from what I understand, this shouldn't matter to the core issue here (besides of slightly off-pitch), because play() (with loops=-1, of course) simply loops over the provided sample. Thus, your solution still produces the same rattle as my try. I charted both arrays, and they are basically equivalent. Any other ideas, where the rattle comes from? I have a cheap build-in soundcard, but this has been perfectly been able to provide decent music with other software, so far. - Jerzy
