105 lines
3.1 KiB
C
105 lines
3.1 KiB
C
/*
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* MIT License
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*
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* Copyright (c) 2020 Joey Castillo
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "watch_buzzer.h"
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#include "watch_main_loop.h"
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#include <emscripten.h>
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static bool buzzer_enabled = false;
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static uint32_t buzzer_period;
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void watch_enable_buzzer(void) {
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buzzer_enabled = true;
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buzzer_period = NotePeriods[BUZZER_NOTE_A4];
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EM_ASM({
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Module['audioContext'] = new (window.AudioContext || window.webkitAudioContext)();
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});
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}
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void watch_set_buzzer_period(uint32_t period) {
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if (!buzzer_enabled) return;
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buzzer_period = period;
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}
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void watch_disable_buzzer(void) {
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buzzer_enabled = false;
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buzzer_period = NotePeriods[BUZZER_NOTE_A4];
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EM_ASM({
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if (Module['audioContext']) {
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Module['audioContext'].close();
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Module['audioContext'] = null;
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}
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});
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}
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void watch_set_buzzer_on(void) {
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if (!buzzer_enabled) return;
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EM_ASM({
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const audioContext = Module['audioContext'];
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if (!audioContext) return;
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if (!(audioContext._oscillator && audioContext._gain)) {
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const oscillator = audioContext.createOscillator();
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const gain = audioContext.createGain();
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oscillator.type = 'triangle';
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oscillator.connect(gain);
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gain.connect(audioContext.destination);
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oscillator.start(0);
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audioContext._oscillator = oscillator;
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audioContext._gain = gain;
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}
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audioContext._oscillator.frequency.value = 1e6/$0;
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audioContext._gain.gain.value = 1;
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}, buzzer_period);
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}
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void watch_set_buzzer_off(void) {
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if (!buzzer_enabled) return;
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EM_ASM({
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const audioContext = Module['audioContext'];
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if (audioContext && audioContext._gain) {
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audioContext._gain.gain.value = 0;
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}
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});
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}
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void watch_buzzer_play_note(BuzzerNote note, uint16_t duration_ms) {
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if (note == BUZZER_NOTE_REST) {
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watch_set_buzzer_off();
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} else {
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watch_set_buzzer_period(NotePeriods[note]);
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watch_set_buzzer_on();
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}
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main_loop_sleep(duration_ms);
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watch_set_buzzer_off();
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}
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