/*
 * This utility converts a GSM EFR speech recording from Themyscira Wireless
 * gsmx format into hex strings of TCH UL bits, to be fed to the TCH UL play
 * buffer in the Calypso DSP by way of a suitable FreeCalypso firmware version
 * and the special tch play command in fc-shell.
 */

#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>

main(argc, argv)
	char **argv;
{
	FILE *inf, *outf;
	u_char efr_bytes[31], tidsp_bytes[33];
	int cc, i, gotsome = 0;

	if (argc != 3) {
		fprintf(stderr, "usage: %s infile outfile\n", argv[0]);
		exit(1);
	}
	inf = fopen(argv[1], "r");
	if (!inf) {
		perror(argv[1]);
		exit(1);
	}
	outf = fopen(argv[2], "w");
	if (!outf) {
		perror(argv[2]);
		exit(1);
	}
	for (;;) {
		cc = fread(efr_bytes, 1, 31, inf);
		if (cc < 31)
			break;
		if ((efr_bytes[0] & 0xF0) != 0xC0) {
invalid:		fprintf(stderr,
				"error: %s is not in EFR codec format\n",
				argv[1]);
			exit(1);
		}
		efr_std_to_tidsp(efr_bytes, tidsp_bytes);
		for (i = 0; i < 33; i++)
			fprintf(outf, "%02X", tidsp_bytes[i]);
		putc('\n', outf);
		gotsome = 1;
	}
	fclose(outf);
	if (cc) {
		if (gotsome)
			fprintf(stderr,
			"warning: extra non-31 bytes at the end of %s\n",
				argv[1]);
		else
			goto invalid;
	}
	exit(0);
}