add nbs and txt support for music

changelog.json

@@ -3,5 +3,6 @@
   "1.19 Support",
   "*music play file autocomplete",
   "Improved URL loading in *draw and *music playurl",
-  "You can now do *clearchat [player] without \"specific\""
+  "You can now do *clearchat [player] without \"specific\"",
+  "Added .nbs and .txt support for music command"
 ]

commands/music.js

@@ -3,6 +3,7 @@
 const fs = require('fs/promises')
 const { EmbedBuilder } = require('discord.js')
 const path = require('path')
+const getFilenameFromUrl = require('../util/getFilenameFromUrl')
 const fileExists = require('../util/file-exists')
 const fileList = require('../util/file-list')
 const axios = require('axios')
@@ -31,7 +32,7 @@ async function play (bot, values, discord, channeldc, selector, config) {
         filepath !== '') absolutePath = await resolve(file)
     else absolutePath = await resolve(filepath)
 
-    song = bot.music.load(await fs.readFile(absolutePath), path.basename(absolutePath))
+    song = await bot.music.load(await fs.readFile(absolutePath), path.basename(absolutePath))
     bot.music.queue.push(song)
     bot.music.play(song)
     if (discord) {
@@ -44,6 +45,7 @@ async function play (bot, values, discord, channeldc, selector, config) {
       bot.tellraw(selector, [{ text: 'Added ', color: 'white' }, { text: song.name, color: 'gold' }, { text: ' to the song queue', color: 'white' }])
     }
   } catch (e) {
+    console.log(e)
     if (discord) {
       const Embed = new EmbedBuilder()
         .setColor(config.discord.embedsColors.error)
@@ -66,7 +68,7 @@ async function playUrl (bot, values, discord, channeldc, selector, config) {
       },
       responseType: 'arraybuffer'
     })
-    song = bot.music.load(response.data, url)
+    song = await bot.music.load(response.data, getFilenameFromUrl(url))
     bot.music.queue.push(song)
     bot.music.play(song)
     if (discord) {

plugins/music.js

@@ -1,6 +1,8 @@
-
+const path = require('path')
 const { Midi } = require('@tonejs/midi')
 const { convertMidi } = require('../util/midi_converter')
+const convertNBS = require('../util/nbs_converter')
+const parseTXTSong = require('../util/txt_song_parser')
 
 const soundNames = {
   harp: 'minecraft:block.note_block.harp',
@@ -79,11 +81,22 @@ function inject (bot) {
     clearInterval(interval)
   })
 
-  bot.music.load = function (buffer, fallbackName = '[unknown]') {
-    // TODO: NBS Support
-    const midi = new Midi(buffer)
-    const song = convertMidi(midi)
-    if (song.name === '') song.name = fallbackName
+  bot.music.load = async function (buffer, fallbackName = '[unknown]') {
+    let song
+    switch (path.extname(fallbackName)) {
+      case '.nbs':
+        song = convertNBS(buffer)
+        break
+      case '.txt':
+        song = parseTXTSong(buffer.toString())
+        break
+      default:
+        // eslint-disable-next-line no-case-declarations
+        const midi = new Midi(buffer)
+        song = convertMidi(midi)
+        if (song.name === '') song.name = fallbackName
+        break
+    }
     return song
   }
 

util/getFilenameFromUrl.js

@@ -0,0 +1,14 @@
+const path = require('path')
+/**
+ * get filename from url
+ * @param {string} urlStr the url
+ * @return {string} filename
+ * @example
+ * getFilenameFromUrl('https://sus.red/amogus.mid?verysus=true') // returns 'amogus.mid'
+ */
+function getFilenameFromUrl (urlStr) {
+  const url = new URL(urlStr)
+  return path.basename(url.pathname)
+}
+
+module.exports = getFilenameFromUrl

util/nbs_converter.js

@@ -0,0 +1,62 @@
+const nbs = require('./nbs_file')
+const instrumentNames = [
+  'harp',
+  'bass',
+  'basedrum',
+  'snare',
+  'hat',
+  'guitar',
+  'flute',
+  'bell',
+  'chime',
+  'xylophone',
+  'iron_xylophone',
+  'cow_bell',
+  'didgeridoo',
+  'bit',
+  'banjo',
+  'pling'
+]
+
+function convertNBS (buf) {
+  const parsed = nbs.parse(buf)
+  const song = {
+    name: parsed.songName,
+    notes: [],
+    loop: false,
+    loopPosition: 0,
+    length: 0
+  }
+  if (parsed.loop > 0) {
+    song.loop = true
+    song.loopPosition = parsed.loopStartTick
+  }
+  for (const note of parsed.nbsNotes) {
+    let instrument = note.instrument
+    if (note.instrument < instrumentNames.length) {
+      instrument = instrumentNames[note.instrument]
+    } else continue
+
+    if (note.key < 33 || note.key > 55) continue
+
+    const layerVolume = 100
+    // will add layer volume later
+
+    const time = tickToMs(note.tick, parsed.tempo)
+    song.length = Math.max(song.length, time)
+
+    song.notes.push({
+      instrument,
+      pitch: note.key - 33,
+      volume: note.velocity * layerVolume / 10000,
+      time
+    })
+  }
+  return song
+}
+
+function tickToMs (tick = 1, tempo) {
+  return Math.floor(1000 * tick * 100 / tempo)
+}
+
+module.exports = convertNBS

util/nbs_file.js

@@ -0,0 +1,157 @@
+function parse (buffer) {
+  let i = 0
+
+  let songLength = 0
+  let format = 0
+  let vanillaInstrumentCount = 0
+  songLength = readShort()
+  if (songLength === 0) {
+    format = readByte()
+  }
+
+  if (format >= 1) {
+    vanillaInstrumentCount = readByte()
+  }
+  if (format >= 3) {
+    songLength = readShort()
+  }
+
+  const layerCount = readShort()
+  const songName = readString()
+  const songAuthor = readString()
+  const songOriginalAuthor = readString()
+  const songDescription = readString()
+  const tempo = readShort()
+  const autoSaving = readByte()
+  const autoSavingDuration = readByte()
+  const timeSignature = readByte()
+  const minutesSpent = readInt()
+  const leftClicks = readInt()
+  const rightClicks = readInt()
+  const blocksAdded = readInt()
+  const blocksRemoved = readInt()
+  const origFileName = readString()
+
+  let loop = 0
+  let maxLoopCount = 0
+  let loopStartTick = 0
+  if (format >= 4) {
+    loop = readByte()
+    maxLoopCount = readByte()
+    loopStartTick = readShort()
+  }
+
+  const nbsNotes = []
+  let tick = -1
+  while (true) {
+    const tickJumps = readShort()
+    if (tickJumps === 0) break
+    tick += tickJumps
+
+    let layer = -1
+    while (true) {
+      const layerJumps = readShort()
+      if (layerJumps === 0) break
+      layer += layerJumps
+      const note = nbsNote()
+      note.tick = tick
+      note.layer = layer
+      note.instrument = readByte()
+      note.key = readByte()
+      if (format >= 4) {
+        note.velocity = readByte()
+        note.panning = readByte()
+        note.pitch = readShort()
+      }
+      nbsNotes.push(note)
+    }
+  }
+
+  const nbsLayers = []
+  if (i <= buffer.length) {
+    for (let j = 0; j < layerCount; j++) {
+      const layer = nbsLayer()
+      layer.name = readString()
+      if (format >= 4) {
+        layer.lock = readByte()
+      }
+      layer.volume = readByte()
+      if (format >= 2) {
+        layer.stereo = readByte()
+      }
+      nbsLayers.push(layer)
+    }
+  }
+
+  return {
+    songLength,
+    format,
+    vanillaInstrumentCount,
+    layerCount,
+    songName,
+    songAuthor,
+    songOriginalAuthor,
+    songDescription,
+    tempo,
+    autoSaving,
+    autoSavingDuration,
+    timeSignature,
+    minutesSpent,
+    leftClicks,
+    rightClicks,
+    blocksAdded,
+    blocksRemoved,
+    origFileName,
+    loop,
+    maxLoopCount,
+    loopStartTick,
+    nbsNotes,
+    nbsLayers
+  }
+
+  function readByte () {
+    return buffer.readInt8(i++)
+  }
+
+  function readShort () {
+    const short = buffer.readInt16LE(i)
+    i += 2
+    return short
+  }
+
+  function readInt () {
+    const int = buffer.readInt32LE(i)
+    i += 4
+    return int
+  }
+
+  function readString () {
+    let length = readInt()
+    let string = ''
+    for (; length > 0; length--) string += String.fromCharCode(readByte())
+    return string
+  }
+}
+
+function nbsNote () {
+  return {
+    tick: null,
+    layer: null,
+    instrument: null,
+    key: null,
+    velocity: 100,
+    panning: 100,
+    pitch: 0
+  }
+}
+
+function nbsLayer () {
+  return {
+    name: null,
+    lock: 0,
+    volume: null,
+    stereo: 100
+  }
+}
+
+module.exports = { parse, nbsNote, nbsLayer }

util/txt_song_parser.js

@@ -0,0 +1,15 @@
+const { instrumentsArray } = require('minecraft-data')('1.15.2') // chip hardcoding moment
+
+function parseTXTSong (data) {
+  let length = 0
+  const notes = String(data).split(/\r\n|\r|\n/).map(line => {
+    const [tick, pitch, instrument] = line.split(':').map(Number)
+    if (tick === undefined || pitch === undefined || instrument === undefined) return undefined
+    const time = tick * 50
+    length = Math.max(length, time)
+    return { time, pitch, instrument: instrumentsArray[instrument].name, volume: 1 }
+  }).filter(note => note !== undefined)
+  return { name: '', notes, loop: false, loopPosition: 0, length }
+}
+
+module.exports = parseTXTSong