User:Elleke Hageman/Python: Sound and Image

Sound #1

import wave, struct
 
filename = "sound.wav"
nframes=0
nchannels=1
sampwidth=1 # in bytes so 2=16bit, 1=8bit
framerate=44100
bufsize=2048
 
w = wave.open(filename, 'w')
w.setparams((nchannels, sampwidth, framerate, nframes, 'NONE', 'not compressed'))
 
max_amplitude = float(int((2 ** (sampwidth * 8)) / 2) - 1)
 
# split the samples into chunks (to reduce memory consumption and improve performance)
#for chunk in grouper(bufsize, samples):
#    frames = ''.join(''.join(struct.pack('h', int(max_amplitude * sample)) for sample in channels) for channels in chunk if channels is not None)
#    w.writeframesraw(frames)
 
freq = 15000
# this means that FREQ times a second, we need to complete a cycle
# there are FRAMERATE samples per second
# so FRAMERATE / FREQ = CYCLE LENGTH
cycle = framerate / freq
 
 
data = ''
for i in range(10):
    for x in range(20000):
        data += struct.pack('h', int(0.4 * max_amplitude))
    for x in range(1000):
        data += struct.pack('h', int(-0.8 * max_amplitude))
 
w.writeframesraw(data)
 
w.close()

Sound #2

import wave, struct
 
filename = "sound2.wav"
nframes=0
nchannels=1
sampwidth=2 
framerate=44100
bufsize=2048
 
w = wave.open(filename, 'w')
w.setparams((nchannels, sampwidth, framerate, nframes, 'NONE', 'not compressed'))
 
max_amplitude = float(int((2 ** (sampwidth * 8)) / 2) - 1)

 
freq = 1200
cycle = framerate / freq
 
 
data = ''
for i in range(500):
    for _ in range(cycle/1):
        data += struct.pack('h', int(0.5 * max_amplitude))
    for _ in range(cycle/1):
        data += struct.pack('h', int(-0.5 * max_amplitude))

freq = 200
cycle = framerate / freq
 
for _ in range(100):
    data = ''
    cycle = framerate / freq
    for _ in range(190):
        for _ in range(cycle/2):
            data += struct.pack('h', int(0.5 * max_amplitude))
            data += struct.pack('h', 0)
        for _ in range(cycle/2):
            data += struct.pack('h', int(-0.5 * max_amplitude))
            data += struct.pack('h', 0)      
 
w.writeframesraw(data)
 
w.close()