working dos vga writes!

Tools/compress_snd_test.py

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+#!/usr/bin/env python3
+# Compression testing for sound sample data for expected cases of ours.
+
+# TODO: Implement our own CLI tool that uses our LZW implementation, as it differs.
+
+import ncompress
+import sys
+import wave
+import audioop
+import numpy as np
+import array
+
+with wave.open(sys.argv[1], 'rb') as wf:
+    channels = wf.getnchannels()
+    samplerate = wf.getframerate()
+    frames = wf.getnframes()
+    uncompressed = wf.readframes(frames)
+    depth = wf.getsampwidth()
+
+compressed = ncompress.compress(uncompressed)
+print("Uncompressed:", len(uncompressed))
+print("Compressed:", len(compressed), len(compressed) / len(uncompressed))
+
+delta = bytearray(uncompressed[0].to_bytes(2, signed=False))
+for i in range(len(uncompressed)-1):
+    delta += (uncompressed[i+1] - uncompressed[i]).to_bytes(2, signed=True)
+
+dtcompressed = ncompress.compress(bytes(delta))
+print("Delta:", len(dtcompressed), len(dtcompressed) / len(uncompressed))
+assert(len(delta) == len(uncompressed)*2)
+
+ulaw = audioop.lin2ulaw(uncompressed, depth)
+ulawcompressed = ncompress.compress(ulaw)
+print("Ulaw:", len(ulawcompressed), len(ulawcompressed) / len(uncompressed))
+
+absfold = bytearray()
+for i in range(len(uncompressed)):
+    absfold.append(uncompressed[i] - 128 if uncompressed[i] >= 128 else uncompressed[i])
+absfoldulaw = audioop.lin2ulaw(absfold, depth)
+absfoldulawcompressed = ncompress.compress(absfoldulaw)
+print("Ulawabs:", len(absfoldulawcompressed), len(absfoldulawcompressed) / len(absfold))
+
+with open(sys.argv[1] + ".ulaw", "wb") as file:
+    file.write(audioop.ulaw2lin(ulaw, depth))