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#!/usr/bin/env python
import struct
def uint32(number):
return struct.pack('<I', number)
def uint16(number):
return struct.pack('<H', number)
mono_raw = struct.pack('<5h', 0, 1, 2, -2, -1)
# floating point data is typically limited to the interval [-1.0, 1.0],
# but smaller/larger values are supported as well
stereo_raw = struct.pack('<8f',
1.75, -1.75,
1.0, -1.0,
0.5, -0.5,
0.25, -0.25)
mono_data = (
b'RIFF' +
uint32(46) + # size
b'WAVE' + # file type
b'fmt ' +
uint32(16) + # chunk size
uint16(1) + # data type (PCM)
uint16(1) + # channels
uint32(44100) + # samplerate
uint32(44100 * 2) + # bytes per second
uint16(2) + # frame size
uint16(16) + # bits per sample
b'data' +
uint32(5 * 2) + # chunk size
mono_raw
)
stereo_data = (
b'RIFF' +
uint32(80) + # size
b'WAVE' + # file type
b'fmt ' +
uint32(16) + # chunk size
uint16(3) + # data type (float)
uint16(2) + # channels
uint32(44100) + # samplerate
uint32(44100 * 2 * 4) + # bytes per second
uint16(2 * 4) + # frame size
uint16(32) + # bits per sample
b'fact' +
uint32(4) + # chunk size
uint32(4) + # number of frames
b'data' +
uint32(8 * 4) + # chunk size
stereo_raw
)
with open('stereo.wav', 'wb') as f:
f.write(stereo_data)
with open('mono.wav', 'wb') as f:
f.write(mono_data)
with open('mono.raw', 'wb') as f:
f.write(mono_raw)
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