Draw points cloud and save to stereo wav file

draw_wave.py

import numpy as np
import matplotlib.pyplot as plt

left = list()
right = list()

# Read data from a file
# dataread = np.fromfile("test.wav", dtype='<i2')
# for i in range(22, 198):
#     if i%2:
#         right.append(dataread[i])
#     else:
#         left.append(dataread[i])

fig = plt.figure()
ax = fig.add_subplot(111)

axes = plt.gca()
axes.set_xlim([-32767,32767])
axes.set_ylim([-32767,32767])

ax.plot(left, right, color='r', linewidth=3, marker='o')
ax.grid(True)

def onclick(event):
    if event.xdata and event.ydata:
        left.append(event.xdata)
        right.append(event.ydata)
        ax.plot(left, right, color='r', linewidth=3, marker='o')
        fig.canvas.draw()

cid = fig.canvas.mpl_connect('button_press_event', onclick)
plt.show()



data = []
for i in range(len(left)):
    if left[i] < 0:
        left[i] = left[i] + 64000
    if right[i] < 0:
        right[i] = right[i] + 64000
    data.append(chr(int(right[i])%256) + chr(int(int(right[i])/256)))
    data.append(chr(int(left[i])%256) + chr(int(int(left[i])/256)))

length = 36+len(data) # header length
header = [0x5249, 0x4646, (length%256*256+length/256), 0x0000, 0x5741, 0x5645, 0x666D, 0x7420,
          0x1000, 0x0000, 0x0100, 0x0200, 0x44AC, 0x0000, 0x10B1, 0x0200,
          0x0400, 0x1000, 0x6461, 0x7461, ((len(data)%65536)*2%256*256+len(data)*2//256), (len(data)*2//65536*256 + len(data)*2//16777216)]
t=''
for i in header:
    t += chr(i//256) + chr(i%256)
t += ''.join(data)
np.ndarray(shape=(len(t)//2,),dtype='<i2',buffer=t).tofile('OUT.wav')