CS:GO voice demo parser

csgo.c

#include <unistd.h>
#include <stdlib.h>
#include <math.h>
#include <stdio.h>
#include <stdint.h>
#include <sys/time.h>

#include <celt.h>

// gcc -o csgo csgo.c -I./celt-0.11.1/libcelt -L"$HOME/.steam/steam/steamapps/common/Counter-Strike Global Offensive/bin/linux64" -l:vaudio_celt_client.so && ./csgo && play -t raw -r 22050 -e signed -b 16 -c 1 out.raw

// export LD_LIBRARY_PATH="$HOME/.steam/steam/steamapps/common/Counter-Strike Global Offensive/bin/linux64"
// ./csgo
// play -t raw -r 22050 -e signed -b 16 -c 1 out.raw 
// sox -t raw -r 22050 -e signed -b 16 -c 1 -L out.raw out.wav

#define BUF_SIZE 1024*1024

int main(int argc, char *argv[]) {
	unsigned char buf[BUF_SIZE];

	const unsigned int FRAME_SIZE = 512;
	const unsigned int SAMPLE_RATE = 22050;

	FILE *f = fopen("voicedata.dat", "r");
	if (f == NULL) {
		  return 1;
	}

	size_t read = fread(buf, 1, BUF_SIZE, f);
	fclose(f);

	CELTMode *dm = celt_mode_create(SAMPLE_RATE, FRAME_SIZE, NULL);
	CELTDecoder *d = celt_decoder_create_custom(dm, 1, NULL);

	size_t outsize = (read / 64) * FRAME_SIZE * sizeof(celt_int16);
	celt_int16* pcmout = malloc(outsize);

	size_t done = 0;
	int frames = 0;

	for (; done < read; done += 64, frames++) {
		int ret = 0;
		if ((ret = celt_decode(d, buf + done, 64, pcmout + frames * FRAME_SIZE, FRAME_SIZE)) < 0) {
			fprintf(stderr, "unable to decode... > %d (at %d/%d)\n", ret, done, read);
			//return 1;
		}
		//printf("Done %d/%d (to %ld/%ld)\n", done, read, frames * FRAME_SIZE * 2, outsize);
	}

	FILE* file_p = fopen("out.raw", "w");
	size_t written = fwrite(pcmout, outsize, 1, file_p);
	fclose(file_p);

	free(pcmout);
	return 0;
}

So you can just "insert" the audio into the .dem file by just reversing this one process? How come noone ever thought of that?

Maybe no one ever needed it. ¯_(ツ)_/¯ Anyway, here it is: https://github.com/ericek111/GODemolyser/blob/master/GODemolyser/src/eu/lixko/godemolyser/codec/VoiceWriter.java

And here's a demo produced by that abomination: https://drive.google.com/file/d/1Lyo6cPh1ps_BVXDwxcD5jty7l25MU42Z/view?usp=sharing