misguided attempt at image rendering

.gitignore

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+*.wav

render.py

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