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/*
* MIT License
*
* Copyright (c) 2020 Joey Castillo
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "watch_buzzer.h"
#include "watch_main_loop.h"
#include <emscripten.h>
#include <emscripten/html5.h>
static bool buzzer_enabled = false;
static uint32_t buzzer_period;
void cb_watch_buzzer_seq(void *userData);
static uint16_t _seq_position;
static int8_t _tone_ticks, _repeat_counter;
static long _em_interval_id = 0;
static int8_t *_sequence;
static void (*_cb_finished)(void);
static inline void _em_interval_stop() {
emscripten_clear_interval(_em_interval_id);
_em_interval_id = 0;
}
void watch_buzzer_play_sequence(int8_t *note_sequence, void (*callback_on_end)(void)) {
if (_em_interval_id) _em_interval_stop();
watch_set_buzzer_off();
_sequence = note_sequence;
_cb_finished = callback_on_end;
_seq_position = 0;
_tone_ticks = 0;
_repeat_counter = -1;
// prepare buzzer
watch_enable_buzzer();
// initiate 64 hz callback
_em_interval_id = emscripten_set_interval(cb_watch_buzzer_seq, (double)(1000/64), (void *)NULL);
}
void cb_watch_buzzer_seq(void *userData) {
// callback for reading the note sequence
(void) userData;
if (_tone_ticks == 0) {
if (_sequence[_seq_position] < 0 && _sequence[_seq_position + 1]) {
// repeat indicator found
if (_repeat_counter == -1) {
// first encounter: load repeat counter
_repeat_counter = _sequence[_seq_position + 1];
} else _repeat_counter--;
if (_repeat_counter > 0)
// rewind
if (_seq_position > _sequence[_seq_position] * -2)
_seq_position += _sequence[_seq_position] * 2;
else
_seq_position = 0;
else {
// continue
_seq_position += 2;
_repeat_counter = -1;
}
}
if (_sequence[_seq_position] && _sequence[_seq_position + 1]) {
// read note
BuzzerNote note = _sequence[_seq_position];
if (note == BUZZER_NOTE_REST) {
watch_set_buzzer_off();
} else {
watch_set_buzzer_period(NotePeriods[note]);
watch_set_buzzer_on();
}
// set duration ticks and move to next tone
_tone_ticks = _sequence[_seq_position + 1];
_seq_position += 2;
} else {
// end the sequence
watch_buzzer_abort_sequence();
if (_cb_finished) _cb_finished();
}
} else _tone_ticks--;
}
void watch_buzzer_abort_sequence(void) {
// ends/aborts the sequence
if (_em_interval_id) _em_interval_stop();
watch_set_buzzer_off();
}
void watch_enable_buzzer(void) {
buzzer_enabled = true;
buzzer_period = NotePeriods[BUZZER_NOTE_A4];
EM_ASM({
Module['audioContext'] = new (window.AudioContext || window.webkitAudioContext)();
});
}
void watch_set_buzzer_period(uint32_t period) {
if (!buzzer_enabled) return;
buzzer_period = period;
}
void watch_disable_buzzer(void) {
buzzer_enabled = false;
buzzer_period = NotePeriods[BUZZER_NOTE_A4];
EM_ASM({
if (Module['audioContext']) {
Module['audioContext'].close();
Module['audioContext'] = null;
}
});
}
void watch_set_buzzer_on(void) {
if (!buzzer_enabled) return;
EM_ASM({
const audioContext = Module['audioContext'];
if (!audioContext) return;
if (!(audioContext._oscillator && audioContext._gain)) {
const oscillator = audioContext.createOscillator();
const gain = audioContext.createGain();
oscillator.type = 'triangle';
oscillator.connect(gain);
gain.connect(audioContext.destination);
oscillator.start(0);
audioContext._oscillator = oscillator;
audioContext._gain = gain;
}
audioContext._oscillator.frequency.value = 1e6/$0;
audioContext._gain.gain.value = 1;
}, buzzer_period);
}
void watch_set_buzzer_off(void) {
if (!buzzer_enabled) return;
EM_ASM({
const audioContext = Module['audioContext'];
if (audioContext && audioContext._gain) {
audioContext._gain.gain.value = 0;
}
});
}
void watch_buzzer_play_note(BuzzerNote note, uint16_t duration_ms) {
if (note == BUZZER_NOTE_REST) {
watch_set_buzzer_off();
} else {
watch_set_buzzer_period(NotePeriods[note]);
watch_set_buzzer_on();
}
main_loop_sleep(duration_ms);
watch_set_buzzer_off();
}
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