dipl/code/textadv/include/sound.h

/* Copyright © 2020 tyrolyean
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef _SOUND_H
#define _SOUND_H

#include <stdint.h>
#include <avr/pgmspace.h>

struct tone_t {
	uint8_t waveform;
	int16_t frequency_deviation; /*  */
	uint16_t length; /* The tone length in milliseconds */
};

/* The end marker tells the sound routines where the end of a track is. It
 * is required to be present at the end of EVERY track, otherwise the 
 * routine runs into undefined behaviour */
#define TRACK_END_MARKER {DAC_MODE_SILENT, 0, 0}

extern const struct tone_t computer_room_track[] PROGMEM;
extern const struct tone_t lonely_road_track[] PROGMEM;

#define INTRO_LEN 10350
extern const struct tone_t intro_track[] PROGMEM;

extern const struct tone_t * current_track;
extern int16_t global_frequency_offset; /* Added to every playing song */

void update_sound();
void init_sound();


#endif