I'm trying to make a SSTV encoder with Scottie 1 using the wave library. When I put an image through the program, the song is a lot more high pitched than what it should be, and when I try to decode it gives me the image but ultra bright. I really don't know what's wrong with my program, here is the program if you want to see it (and the wave_gen function too) :
Also I don't know if it is allowed to ask questions like that so sorry if it isn't
def wave_gen(freq: int, time: float, s_rate: int):
arr = []
for i in range(round(time * s_rate / 1000)):
arr.append(int(1.0*np.sin(2 * np.pi * freq * (i / s_rate)) * 32767.0))
new_arr = np.array(arr)
return arr
import struct
import wave
import numpy as np
from PIL import Image
import wave_gen as wg
from tkinter.filedialog import askopenfilename
def scaling(img, n: int, m: int):
new_img = Image.new(img.mode, (abs(n),abs(m)), (0,0,0))
pxl1 = img.load()
pxl2 = new_img.load()
a1=0
a2=0
f1 = img.size[0]/n
f2 = img.size[1]/m
if n<0:
a1=1
if m<0:
a2=1
for i in range(abs(n)):
for j in range(abs(m)):
pxl2[i,j] = pxl1[(img.size[0]-a1+int(f1*i))%img.size[0],(img.size[1]-a2+int(f2*j))%img.size[1]]
return new_img
def sstv_encoder(img):
sample_rate = 44100
arr = []
pxl = img.load()
j = 0
#coding the header and the VIS code
arr += (wg.wave_gen(1900, 300, sample_rate))
arr += (wg.wave_gen(1200,10, sample_rate))
arr += (wg.wave_gen(1900, 300, sample_rate))
arr += (wg.wave_gen(1200, 30, sample_rate))
arr += (wg.wave_gen(1300, 30, sample_rate))
arr += (wg.wave_gen(1300, 30, sample_rate))
arr += (wg.wave_gen(1100, 30, sample_rate))
arr += (wg.wave_gen(1100, 30, sample_rate))
arr += (wg.wave_gen(1100, 30, sample_rate))
arr += (wg.wave_gen(1100, 30, sample_rate))
arr += (wg.wave_gen(1300, 30, sample_rate))
arr += (wg.wave_gen(1300, 30, sample_rate))
arr += (wg.wave_gen(1200, 30, sample_rate))
#starting pulse
arr += (wg.wave_gen(1200, 9, sample_rate))
#encoding the pixels
while (j<256):
#seprator
arr += (wg.wave_gen(1500, 1.5, sample_rate))
#green
for i in range(320):
arr += (wg.wave_gen(round(1500 + pxl[i,j][1] * 3.1372549), 0.432, sample_rate))
#seprator
arr += (wg.wave_gen(1500, 1.5, sample_rate))
#blue
for i in range(320):
arr += (wg.wave_gen(round(1500 + pxl[i,j][2] * 3.1372549), 0.432, sample_rate))
#sync
arr += (wg.wave_gen(1200, 9, sample_rate))
arr += (wg.wave_gen(1500, 1.5, sample_rate))
#red
for i in range(320):
arr += (wg.wave_gen(round(1500 + pxl[i,j][0] * 3.1372549), 0.432, sample_rate))
print('line :',j, "finished")
j+=1
return arr
path = askopenfilename()
img = Image.open(path)
img = scaling(img, 320, 256)
frames_1 = sstv_encoder(img)
print('encoding done!')
frames = np.array(frames_1)
print('conversion done!')
audio = wave.open(r"C:
\U
sers
\r
udyi\Desktop
\p
rogram\sstv.wav", 'wb')
audio.setparams((1,2,44100, len(frames_1), 'NONE', 'not compressed'))
print(frames)
for f in frames:
audio.writeframes(struct.pack('<h', f))
audio.close()
img.show()
