mirror of
https://gitlab.com/80486DX2-66/gists
synced 2024-09-20 09:15:41 +05:30
113 lines
3.1 KiB
JavaScript
113 lines
3.1 KiB
JavaScript
/*
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Node.JS: Bytebeat generator
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Note: Calls `ffmpeg` to convert output raw audio to a WAVE file
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Warning: The current result is quick and dirty. Not for educational or
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production purposes.
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To-Do: Fix signed bytebeat and floatbeat
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To-Do: (cosmetic) Wrap the code before 81th column
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*/
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const { appendFileSync, unlinkSync, writeFileSync } = require("fs")
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const { tmpdir } = require("os")
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const { execSync } = require("child_process")
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const { basename } = require("path")
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let BUFFER_SIZE = 65536 // feel free to change this
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const LIGHTNING_MODE = false // disables sequential file write optimization, feel free to change this
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const SAMPLE_RATE = 8000 // feel free to change this
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const SECONDS = 30 // feel free to change this
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const CHANNELS = 1 // feel free to change this
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const FINAL_SAMPLE_RATE = 44100 // feel free to change this
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const FINAL_SAMPLE_RATE_CONVERSION = SAMPLE_RATE / FINAL_SAMPLE_RATE / CHANNELS
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const SAMPLES = SECONDS * FINAL_SAMPLE_RATE // feel free to change this
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const PRODUCT = SAMPLES * CHANNELS
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BUFFER_SIZE = LIGHTNING_MODE ? PRODUCT : BUFFER_SIZE
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const TYPE_BYTEBEAT = 0
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const TYPE_SIGNED_BYTEBEAT = 1
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const TYPE_FLOATBEAT = 2
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const SELECTED_TYPE = TYPE_BYTEBEAT // feel free to change this
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// for bytebeat
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const int = x => Math.floor(x)
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const abs = Math.abs
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const cbrt = Math.cbrt
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const cos = Math.cos
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const cosh = Math.cosh
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const floor = Math.floor
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const log = Math.log
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const log2 = Math.log2
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const PI = Math.PI
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const pow = Math.pow
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const random = Math.random
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const sin = Math.sin
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const sinh = Math.sinh
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const sqrt = Math.sqrt
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const tan = Math.tan
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const tanh = Math.tanh
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const generateAudio = t => {
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return t&t>>8
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}
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const constrainValue = sample => {
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switch (SELECTED_TYPE) {
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case TYPE_BYTEBEAT:
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return sample & 255
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case TYPE_SIGNED_BYTEBEAT:
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return ((sample + 127) & 255) - 128
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case TYPE_FLOATBEAT:
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return floor(sample * 127) + 127
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}
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}
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const random_choice = choices => choices[Math.floor(Math.random() * choices.length)]
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const randomFileNameAlphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-"
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const generateRandomFileName = () => {
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let res = tmpdir() + "/" + basename(__filename) + "_"
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for (let i = 0; i < 64; i++)
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res += random_choice(randomFileNameAlphabet)
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return res
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}
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let t = 0
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let fileName = generateRandomFileName()
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writeFileSync(fileName, Buffer.alloc(0))
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// the loop of sequential file writing, created to ease load on RAM
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for (let buffer = 0; t < PRODUCT; buffer++) {
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let audioData = new Uint8Array(BUFFER_SIZE)
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let idx = 0
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for (; idx < BUFFER_SIZE && t < PRODUCT; idx++) {
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let sample = generateAudio(t * FINAL_SAMPLE_RATE_CONVERSION)
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if (sample.constructor === Array)
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sample.forEach((sample, index) => {
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audioData[CHANNELS * idx + index] = constrainValue(sample)
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})
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else
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audioData[idx] = constrainValue(sample)
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t++
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}
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if (t >= PRODUCT) {
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let truncatedArray = new Uint8Array(idx)
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truncatedArray.set(audioData.subarray(0, idx))
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audioData = truncatedArray
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}
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appendFileSync(fileName, Buffer.from(audioData.buffer))
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}
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execSync(`ffmpeg -f u8 -ar ${FINAL_SAMPLE_RATE} -ac ${CHANNELS} -i ${fileName} output_${+new Date()}.wav`)
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unlinkSync(fileName)
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