71 lines
2.3 KiB
JavaScript
71 lines
2.3 KiB
JavaScript
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const Voice = (() => {
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"use strict";
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const RANKS = {mayday: 0, "pan-pan": 1, security: 2};
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const ALARMS = new Set(["mayday", "pan-pan"]);
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const ROUTINE = 3;
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function toneOf(row, human) {
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if (ALARMS.has(row.class)) {
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return "mayday";
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}
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return row.class === "security" || row.to.includes(human) ? "direct" : "radio";
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}
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function loudness(tone, settings) {
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if (tone !== "mayday") {
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return settings.sounds[tone].volume;
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}
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return Math.max(...Object.values(settings.sounds).map((sound) => sound.volume), settings.music.volume);
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}
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function speakable(row, speech) {
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if (!speech.on || !row.speech || !row.voice) {
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return false;
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}
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return row.class === "mayday" || (speech.classes.includes(row.class) && !speech.muted.includes(row.source));
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}
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function rank(item) {
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return Object.hasOwn(RANKS, item.cls) ? RANKS[item.cls] : ROUTINE;
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}
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function enqueue(pending, item, limit) {
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const at = pending.findIndex((other) => rank(other) > rank(item));
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const next = at < 0 ? [...pending, item] : [...pending.slice(0, at), item, ...pending.slice(at)];
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return next.slice(0, limit);
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}
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function frames(duration, rate, seconds) {
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return Math.max(Math.min(Math.ceil(duration * rate), rate * seconds), 0);
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}
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function wav(samples, rate) {
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const size = samples.length * 2;
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const buffer = new ArrayBuffer(44 + size);
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const view = new DataView(buffer);
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const text = (offset, value) => [...value].forEach((char, index) => view.setUint8(offset + index, char.charCodeAt(0)));
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text(0, "RIFF");
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view.setUint32(4, 36 + size, true);
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text(8, "WAVE");
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text(12, "fmt ");
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view.setUint32(16, 16, true);
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view.setUint16(20, 1, true);
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view.setUint16(22, 1, true);
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view.setUint32(24, rate, true);
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view.setUint32(28, rate * 2, true);
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view.setUint16(32, 2, true);
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view.setUint16(34, 16, true);
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text(36, "data");
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view.setUint32(40, size, true);
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samples.forEach((sample, index) => {
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const level = Math.max(-1, Math.min(1, sample));
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view.setInt16(44 + index * 2, level < 0 ? level * 0x8000 : level * 0x7fff, true);
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});
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return buffer;
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}
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return {toneOf, loudness, speakable, enqueue, frames, wav};
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})();
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if (typeof module === "object" && module.exports) {
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module.exports = Voice;
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}
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