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https://gitlab.com/80486DX2-66/gists
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bytebeat-render.js: fix visibility scope
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@ -18,138 +18,145 @@
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* License: Creative Commons Zero 1.0 Universal
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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,
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// feel free to enable 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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var int = x => Math.floor(x)
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var abs = Math.abs
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var acos = Math.acos
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var acosh = Math.acosh
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var asin = Math.asin
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var asinh = Math.asinh
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var atan = Math.atan
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var atanh = Math.atanh
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var cbrt = Math.cbrt
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var cos = Math.cos
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var cosh = Math.cosh
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var exp = Math.exp
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var floor = Math.floor
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var log = Math.log
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var log2 = Math.log2
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var max = Math.max
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var min = Math.min
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var PI = Math.PI
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var pow = Math.pow
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var random = Math.random
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var sin = Math.sin
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var sinh = Math.sinh
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var sqrt = Math.sqrt
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var tan = Math.tan
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var tanh = Math.tanh
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const generateAudio = t => {
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// for bytebeat
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var int = x => Math.floor(x)
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var abs = Math.abs
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var acos = Math.acos
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var acosh = Math.acosh
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var asin = Math.asin
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var asinh = Math.asinh
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var atan = Math.atan
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var atanh = Math.atanh
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var cbrt = Math.cbrt
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var cos = Math.cos
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var cosh = Math.cosh
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var exp = Math.exp
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var floor = Math.floor
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var log = Math.log
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var log2 = Math.log2
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var max = Math.max
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var min = Math.min
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var PI = Math.PI
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var pow = Math.pow
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var random = Math.random
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var sin = Math.sin
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var sinh = Math.sinh
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var sqrt = Math.sqrt
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var tan = Math.tan
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var tanh = Math.tanh
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return t&t>>8
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}
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const clamp = (a, b, c) => max(min(a, c), b)
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function main() {
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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 lastCorrectSample
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switch (SELECTED_TYPE) {
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case TYPE_BYTEBEAT:
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lastCorrectSample = 127
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break;
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case TYPE_SIGNED_BYTEBEAT:
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lastCorrectSample = 0
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break;
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case TYPE_FLOATBEAT:
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lastCorrectSample = 0.0
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break;
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}
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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,
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// feel free to enable this
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const constrainValue = sample => {
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if (isNaN(sample) || sample < 0)
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sample = lastCorrectSample
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else
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lastCorrectSample = sample
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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 /
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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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const clamp = (a, b, c) => max(min(a, c), b)
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let lastCorrectSample
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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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lastCorrectSample = 127
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break
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case TYPE_SIGNED_BYTEBEAT:
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return ((sample + 127) & 255) - 128
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lastCorrectSample = 0
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break
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case TYPE_FLOATBEAT:
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// NOTE: temporary fix copied from a code by lehandsomeguy, see https://
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// www.reddit.com/r/bytebeat/comments/48r00a/floatbeat_test/
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return floor((clamp(sample, -0.9999, 0.9999) * 128) + 128)
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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 =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-"
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const generateRandomFilePath = () => {
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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 filePath = generateRandomFilePath()
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writeFileSync(filePath, Buffer.alloc(0))
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// the loop of sequential file writing, created to ease load on RAM
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const buffer_max = Math.floor((PRODUCT + (BUFFER_SIZE - 1)) / BUFFER_SIZE),
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needTwoBuffers = buffer_max > 1, needSingleBuffer = !needTwoBuffers
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let audioData = new Uint8Array(needSingleBuffer ? PRODUCT : BUFFER_SIZE)
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for (let seq = 0; seq < buffer_max; seq++) {
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if (needTwoBuffers && (t + BUFFER_SIZE) >= PRODUCT) {
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let calculatedSize = PRODUCT - t
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audioData = new Uint8Array(calculatedSize)
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lastCorrectSample = 0.0
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break
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}
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for (let idx = 0; t < PRODUCT && idx < BUFFER_SIZE; idx++, t++) {
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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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const constrainValue = sample => {
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if (isNaN(sample) || sample < 0)
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sample = lastCorrectSample
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else
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audioData[idx] = constrainValue(sample)
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lastCorrectSample = 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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// NOTE: temporary fix copied from a code by lehandsomeguy, see
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// https://www.reddit.com/r/bytebeat/comments/48r00a/floatbeat_test/
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return floor((clamp(sample, -0.9999, 0.9999) * 128) + 128)
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}
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}
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appendFileSync(filePath, Buffer.from(audioData.buffer))
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const random_choice = choices => choices[Math.floor(Math.random() *
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choices.length)]
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const randomFileNameAlphabet =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-"
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const generateRandomFilePath = () => {
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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 filePath = generateRandomFilePath()
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writeFileSync(filePath, Buffer.alloc(0))
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// the loop of sequential file writing, created to ease load on RAM
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const buffer_max = Math.floor((PRODUCT + (BUFFER_SIZE - 1)) / BUFFER_SIZE),
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needTwoBuffers = buffer_max > 1, needSingleBuffer = !needTwoBuffers
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let audioData = new Uint8Array(needSingleBuffer ? PRODUCT : BUFFER_SIZE)
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let t = 0
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for (let seq = 0; seq < buffer_max; seq++) {
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if (needTwoBuffers && (t + BUFFER_SIZE) >= PRODUCT) {
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let calculatedSize = PRODUCT - t
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audioData = new Uint8Array(calculatedSize)
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}
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for (let idx = 0; t < PRODUCT && idx < BUFFER_SIZE; idx++, t++) {
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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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}
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appendFileSync(filePath, Buffer.from(audioData.buffer))
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}
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execSync(
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`ffmpeg -f u8 -ar ${FINAL_SAMPLE_RATE} -ac ${CHANNELS} ` +
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`-i ${filePath} output_${+new Date()}.wav`)
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unlinkSync(filePath)
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}
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execSync(
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`ffmpeg -f u8 -ar ${FINAL_SAMPLE_RATE} -ac ${CHANNELS} ` +
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`-i ${filePath} output_${+new Date()}.wav`)
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unlinkSync(filePath)
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if (require.main === module)
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main()
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