Data update

Task/Musical-scale/Python/musical-scale-2.py

@@ -0,0 +1,48 @@
+import sys
+import ctypes
+import math
+import time
+import struct
+import sdl2
+import sdl2.sdlmixer as mixer
+
+
+def create_sound(frequency, duration):
+    """Create a buffer with sound at given frequency and duration"""
+    num_samples = int(48000 * duration)
+    wave = struct.pack(
+        f"<{num_samples}i",
+        *[
+            int(2**30 * math.sin(2 * math.pi * frequency / 48000 * t))
+            for t in range(num_samples)
+        ]
+    )
+    length = num_samples * 4
+    sound_buffer = (ctypes.c_ubyte * length).from_buffer_copy(wave)
+    sound = mixer.Mix_QuickLoad_RAW(
+        ctypes.cast(sound_buffer, ctypes.POINTER(ctypes.c_ubyte)), length
+    )
+    return sound
+
+
+def main():
+    """Play sine wave"""
+    mixer.Mix_Init(0)
+
+    mixer.Mix_OpenAudioDevice(48000, sdl2.AUDIO_S32, 1, 2048, None, 0)
+
+    note = 261.63
+    semitone = math.pow(2, 1 / 12)
+    duration = 0.5  # seconds
+
+    for step in [0, 2, 2, 1, 2, 2, 2, 1]:
+        note *= semitone**step
+        sound = create_sound(note, duration)
+        mixer.Mix_PlayChannel(0, sound, 1)
+        time.sleep(duration)
+
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())