/*
 * This file is the main module for gsmhr-decode utility.  This utility
 * is intended to serve as the "user-friendly" decoder for GSM-HR encoded
 * speech, reading TW-TS-005 Annex B as input and emitting playable WAV
 * as output.
 */

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include "../libgsmhr1/tw_gsmhr.h"
#include "../libtest/tw5reader.h"
#include "../libtest/wavwriter.h"
#include "../libtest/pcmwrite.h"

main(argc, argv)
	char **argv;
{
	FILE *hexf;
	void *wav;
	unsigned lineno;
	struct gsmhr_decoder_state *state;
	uint8_t frame[TWTS005_MAX_FRAME];
	unsigned frame_len;
	int16_t params[GSMHR_NUM_PARAMS_DEC];
	int16_t pcm[160];
	int rc;

	if (argc != 3) {
		fprintf(stderr, "usage: %s input.hex output.wav\n", argv[0]);
		exit(1);
	}
	hexf = fopen(argv[1], "r");
	if (!hexf) {
		perror(argv[1]);
		exit(1);
	}
	lineno = 0;
	wav = wav_write_open(argv[2], 8000, 16, 1);
	if (!wav) {
		perror(argv[2]);
		exit(1);
	}
	state = gsmhr_decoder_create();
	if (!state) {
		fprintf(stderr, "gsmhr_decoder_create() failed!\n");
		exit(1);
	}
	for (;;) {
		rc = twts005_read_frame(hexf, &lineno, frame, &frame_len);
		if (rc < 0) {
			fprintf(stderr, "%s line %u: not valid TW-TS-005\n",
				argv[1], lineno);
			exit(1);
		}
		if (!rc)
			break;
		rc = gsmhr_rtp_in_direct(frame, frame_len, params);
		if (rc < 0) {
			fprintf(stderr,
				"%s line %u: not a valid GSM-HR frame\n",
				argv[1], lineno);
			exit(1);
		}
		gsmhr_decode_frame(state, params, pcm);
		write_pcm_to_wav(wav, pcm);
	}
	wav_write_close(wav);
	exit(0);
}