85 lines
2.7 KiB
JavaScript
85 lines
2.7 KiB
JavaScript
import { PrismaClient } from "@prisma/client";
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import LCD from "raspberrypi-liquid-crystal";
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import fs from "node:fs";
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import * as WavFileDecoder from "wav-file-decoder";
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const timer = (ms) => new Promise((res) => setTimeout(res, ms));
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const prisma = new PrismaClient();
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const getStanza = async (register) => {
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const stanzaCount = await prisma.stanza.count({ where: { register } });
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const skip = Math.floor(Math.random() * stanzaCount);
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const randomStanza = await prisma.stanza.findMany({
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skip: skip,
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take: 1,
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where: {
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register,
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},
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});
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return randomStanza[0].text;
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};
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// Play portal wave PCM data and set bands
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const fileData = fs.readFileSync("/home/grace/portal/blackportal1000.wav");
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const wavFileInfo = WavFileDecoder.getWavFileInfo(fileData);
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const audioData = WavFileDecoder.decodeWavFile(fileData);
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const totalSamples = wavFileInfo.chunkInfo.filter((ci) => ci.chunkId === "data")[0].dataLength;
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let sample = 0;
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let register = "high";
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let count = 0;
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setInterval(() => {
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const absSample = Math.abs(audioData.channelData[0][count]);
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if (count > totalSamples) {
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count = 0;
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}
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else {
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count++;
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}
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register = "high";
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if (absSample < 0.01) {
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register = "mid";
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}
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if (absSample < 0.001) {
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register = "low";
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}
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sample = absSample;
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}, 1);
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const lcd = new LCD(1, 0x27, 16, 2);
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lcd.beginSync();
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lcd.clearSync();
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const TICK = 250;
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const WAIT = 10;
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// Play bottom line
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const tag = " Black Portal 4856 E Davison, Detroit ";
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let tagCharacterLocation = 0;
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setInterval(() => {
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lcd.printLineSync(1, " ");
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setTimeout(() => {
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lcd.printLineSync(1, tag.substring(tagCharacterLocation, 16 + tagCharacterLocation));
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}, WAIT);
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tagCharacterLocation++;
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if (tagCharacterLocation > tag.length) {
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tagCharacterLocation = 0;
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}
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}, TICK);
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// Play top line
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const playNewStanza = async () => {
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let stanza = await getStanza(register);
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let stanzaWaitTimeout;
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let stanzaCharacterLocation = 0;
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const scrollStanza = async () => {
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lcd.printLineSync(0, " ");
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stanzaWaitTimeout = setTimeout(() => {
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lcd.printLineSync(0, `${16 - stanzaCharacterLocation > 0
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? Array(16 - stanzaCharacterLocation).join(" ")
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: ""}${stanza}`.substring(stanzaCharacterLocation, stanza.length));
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}, WAIT);
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await timer(TICK);
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stanzaCharacterLocation++;
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if (stanzaCharacterLocation === stanza.length) {
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playNewStanza();
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}
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else {
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scrollStanza();
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}
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};
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scrollStanza();
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};
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playNewStanza();
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