Solution script for Challenge Screams from riceteacatpanda CTF 2020

wavDecode.py

## Fixing wav and generating an img

import soundfile as sf
import numpy as np
from PIL import Image
#im = Image.new()

#np.set_printoptions(threshold=np.inf)
data, samplerate = sf.read('../aaaaaaaaaaaaaaaaaa.wav')

print data,samplerate

height = np.size(data)
print height

pixellist = []
audioarr = np.hsplit(data, data.shape[1])[0]
imgarr =  np.hsplit(data, data.shape[1])[1]

tmplist = []

for r in np.nditer(imgarr):
	tmp = '{0:.11f}'.format(abs(r)).replace('0.00','')
	b = int(tmp[:3])
	g = int(tmp[3:6])
	r = int(tmp[6:9])
	tmplist.append((r,g,b))
	if(len(tmplist) == 500):
		pixellist.append(tmplist)
		tmplist = []

print len(pixellist)

array = np.array(pixellist, dtype=np.uint8)

# Use PIL to create an image from the new array of pixels
new_image = Image.fromarray(array)
new_image.save('new22.png')


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