Created
July 4, 2018 01:28
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anise aowr bitcrusher
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import wave | |
TARGET_RATE = 16384 | |
with wave.open('aowr2.wav') as w: | |
with wave.open('aowrcrush2.wav', 'wb') as wout: | |
nchannels, sample_width, framerate, nframes, _, _ = w.getparams() | |
wout.setparams(w.getparams()) | |
outdata = bytearray() | |
gbdata = bytearray() | |
frames_per_note = framerate // TARGET_RATE | |
nybble = None | |
while True: | |
data = w.readframes(frames_per_note) | |
if not data: | |
break | |
n = 0 | |
total = 0 | |
for i in range(0, len(data), nchannels * sample_width): | |
frame = int.from_bytes(data[i : i + sample_width], 'little', signed=True) | |
n += 1 | |
total += frame | |
crushed_frame = round(total / n / (1 << (sample_width * 8 - 4))) | |
encoded_crushed_frame = (crushed_frame << (sample_width * 8 - 4)).to_bytes(2, 'little', signed=True) | |
outdata.extend(encoded_crushed_frame * (nchannels * frames_per_note)) | |
print(f"{n} {total / n:5.0f} {crushed_frame:2d} {(crushed_frame << (sample_width * 8 - 4)):5.0f}") | |
#next_nybble = crushed_frame % 16 | |
next_nybble = crushed_frame + 8 | |
if nybble is None: | |
nybble = next_nybble | |
else: | |
byte = (nybble << 4) | next_nybble | |
gbdata.append(byte) | |
nybble = None | |
wout.writeframes(outdata) | |
with open('build/aowr.dat', 'wb') as f: | |
f.write(gbdata) |
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