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99 lines
3.0 KiB
99 lines
3.0 KiB
#!/usr/bin/env python3
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# Render image to Oscilloscope XY vector audio
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#
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# ----------------------------------------------------------------------------
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# Copyright (c) 2024 Thomas Buck (thomas@xythobuz.de)
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# See <http://www.gnu.org/licenses/>.
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# ----------------------------------------------------------------------------
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import sys
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import wave
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import pyaudio
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from PIL import Image
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samplerate = 44100 #192000
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default_duration = 5.0
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def read_image(image):
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print("image: width={} height={} total={}".format(image.width, image.height, image.width * image.height))
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# resize coordinates for conversion to amplitude values
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max_len = max(image.width, image.height)
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fact = 32767 / max_len
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sw, sh = int(image.width * fact), int(image.height * fact)
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print("amplitude: width={} height={}".format(sw, sh))
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data = bytearray()
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for x in range(0, image.width):
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for y in range(0, image.height):
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if image.getpixel((x, y))[3] > 127:
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xc, yc = int((x - (image.width / 2)) * fact), int((y - (image.height / 2)) * fact)
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data.extend(yc.to_bytes(2, byteorder="little", signed=True))
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data.extend(xc.to_bytes(2, byteorder="little", signed=True))
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return data
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def play_waveform(data):
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pa = pyaudio.PyAudio()
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# int16
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stream = pa.open(format=pa.get_format_from_width(2),
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channels=2,
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rate=samplerate,
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output=True)
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stream.write(data, int(len(data) / 4), True)
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stream.stop_stream()
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stream.close()
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pa.terminate()
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def write_waveform(data):
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with wave.open("out.wav", "w") as f:
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f.setnchannels(2)
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f.setsampwidth(2)
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f.setframerate(samplerate)
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f.writeframes(data)
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def main():
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if len(sys.argv) <= 1:
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print("Usage:")
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print("\t" + sys.argv[0] + " image.png [seconds]")
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sys.exit(1)
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if len(sys.argv) >= 3:
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duration = float(sys.argv[2])
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else:
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duration = default_duration
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with Image.open(sys.argv[1]) as image:
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wave = read_image(image)
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samplecount = int(len(wave) / 2 / 2) # stereo, int16
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drawrate = samplerate / samplecount
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drawcount = drawrate * duration
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print("len={} samples={} drawrate={:.2f} count={:.2f}".format(len(wave), samplecount, drawrate, drawcount))
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data = bytearray()
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for n in range(0, int(drawcount)):
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data.extend(wave)
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print("len={}".format(len(data)))
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#play_waveform(bytes(data))
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write_waveform(bytes(data))
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if __name__ == "__main__":
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main()
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