PCM/Wav converters

README.md

Here are some tools I made for converting PCM to Wav and vice-versa, thanks to @TheBrokenRail for figuring this format out, and making this extractor for it: https://github.com/RandomSoup/Junk-Drawer/blob/master/minecraft/sound-extractor/extract.cpp

Unfortunately, PCM-maker.py is very slow for media files over 10 seconds. I have not figured out a way to correctly do it faster.

PCM-dumper.py

import sys, wave, struct

import lief

if len(sys.argv) < 2:
    print("Usage: <file to find sounds in>")
    sys.exit()

elf = lief.parse(sys.argv[1])
for sym in elf.dynamic_symbols:
    if sym.name.startswith("PCM_"):
        # Print name
        print(sym, bool(elf.get_dynamic_symbol(sym.name)))
        # Dump
        data = bytes(elf.get_content_from_virtual_address(sym.value, sym.size))
        wf = wave.open('dump/' + sym.name + ".wav", 'wb')
        chan, samp, fr, nf = struct.unpack("iiii", data[:16])
        wf.setnchannels(chan)
        wf.setsampwidth(samp)
        wf.setframerate(fr)
        wf.setnframes(nf)
        wf.writeframesraw(data[16:])
        wf.close()

PCM-maker.py

import os, sys, struct, wave

# Audio file to wav
os.system(f"ffmpeg -i {sys.argv[1]} output.wav")

# Wav to metadata + PCM data
w = wave.Wave_read("output.wav")
metadata = struct.pack(
    "iiii",
    w.getnchannels(),
    w.getsampwidth(),
    w.getframerate(),
    w.getnframes()
)
body = metadata + w.readframes(w.getnframes())

# PCM to C
with open("output.c", "w+") as f:
    print(f"unsigned char PCM_{sys.argv[2]}[] = {{", file = f, flush = 0)
    for c in body:
        print(c, file = f, end = ",", flush = 0)
    print("0\n};", file = f);


# C to obj
print("Compiling...")
os.system(f"arm-linux-gnueabihf-gcc output.c -shared -fPIC -o PCM_{sys.argv[2]}")

# Remove everthing but the obj
os.system("rm output.wav output.c")