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/*!
* Sound effect player library.
*
* This implements a state machine for playing back various monophonic
* sound effects such as morse code symbols, clicks and alert tones.
*
* Author Stuart Longland <[email protected]>
* Copyright (C) 2015 FreeDV project.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 2.1,
* as published by the Free Software Foundation. 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 Lesser General Public
* License along with this program; if not, see
* <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include "sfx.h"
static void sfx_next_tone(struct sfx_player_t* const sfx_player)
{
struct tone_gen_t* tone_gen = &(sfx_player->tone_gen);
const struct sfx_note_t* note = sfx_player->note;
if (!note) {
tone_reset(tone_gen, 0, 0);
} else {
tone_reset(tone_gen, note->freq, note->duration);
if (!note->duration)
/* We are done */
sfx_player->note = NULL;
else
/* Move to next note */
sfx_player->note++;
}
}
/*!
* Start playing a particular effect.
* @param sfx_player Effect player state machine
* @param effect Pointer to sound effect (NULL == stop)
*/
void sfx_play(struct sfx_player_t* const sfx_player,
const struct sfx_note_t* effect)
{
sfx_player->note = effect;
sfx_next_tone(sfx_player);
}
/*!
* Retrieve the next sample to be played.
*/
int16_t sfx_next(struct sfx_player_t* const sfx_player)
{
if (!sfx_player)
return(0);
if (!sfx_player->tone_gen.remain)
sfx_next_tone(sfx_player);
return tone_next(&(sfx_player->tone_gen));
}
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