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Create nbs5.lua
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nbs5.lua
Normal file
303
nbs5.lua
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@ -0,0 +1,303 @@
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--[[
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NoteBlock Song API
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by MysticT
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Twekaed by Soni
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Modified for NBS v5 by LDDestroier (WIP)
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--]]
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local nbs5 = {}
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-- yield to avoid error
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local function yield()
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os.queueEvent("yield")
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os.pullEvent("yield")
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end
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-- read short integer (16-bit) from file
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local function readShort(file)
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return file.read() + file.read() * 256
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end
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_G.readShort = readShort
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-- read integer (32-bit) from file
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local function readInt(file)
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return file.read() + file.read() * 256 + file.read() * 65536 + file.read() * 16777216
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end
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-- read string from file
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local function readString(file)
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local s, c = ""
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local len = readInt(file)
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for i = 1, len do
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c = file.read()
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if not c then
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break
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end
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s = s .. string.char(c)
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end
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return s
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end
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local function makeBitNum(num, bytes)
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local output = ""
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for i = 0, bytes - 1 do
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output = output .. string.char(bit32.band(bit32.rshift(num, i * 8), 0xFF))
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end
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return output
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end
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-- write short integer (16-bit) to file
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local function writeShort(file, int)
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file.write(makeBitNum(int, 2))
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end
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-- write integer (32-bit) to file
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local function writeInt(file, int)
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file.write(makeBitNum(int, 4))
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end
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-- write string to file
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local function writeString(file, str)
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writeInt(file, #str)
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file.write(str)
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end
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-- read nbs file header
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local function readNBSHeader(file)
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local header = {}
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header.lenght = readShort(file)
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if header.lenght > 0 then
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-- old NBS
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header.nbs_version = 0
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header.height = readShort(file)
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header.name = readString(file)
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if header.name == "" then
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header.name = "Untitled"
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end
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header.author = readString(file)
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if header.author == "" then
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header.author = "Unknown"
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end
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header.original_author = readString(file)
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if header.original_author == "" then
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header.original_author = "Unknown"
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end
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header.description = readString(file)
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header.tempo = readShort(file) / 100
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header.autosave = file.read()
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header.autosave_duration = file.read()
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header.time_signature = file.read()
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header.minutes_spent = readInt(file)
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header.left_clicks = readInt(file)
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header.right_clicks = readInt(file)
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header.blocks_added = readInt(file)
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header.blocks_removed = readInt(file)
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header.filename = readString(file)
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else
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-- NBS v5
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header.nbs_version = file.read()
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header.vanilla_instruments = file.read()
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header.lenght = readShort(file)
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header.height = readShort(file)
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header.name = readString(file)
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if header.name == "" then
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header.name = "Untitled"
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end
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header.author = readString(file)
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if header.author == "" then
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header.author = "Unknown"
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end
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header.original_author = readString(file)
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if header.original_author == "" then
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header.original_author = "Unknown"
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end
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header.description = readString(file)
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header.tempo = readShort(file) / 100
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header.autosave = file.read()
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header.autosave_duration = file.read()
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header.time_signature = file.read()
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header.minutes_spent = readInt(file)
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header.left_clicks = readInt(file)
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header.right_clicks = readInt(file)
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header.blocks_added = readInt(file)
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header.blocks_removed = readInt(file)
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header.filename = readString(file)
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header.looping = file.read()
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header.max_looping = file.read()
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header.loop_start = readShort(file)
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end
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return header
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end
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-- jump to the next tick in the file
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local function nextTick(file, tSong)
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local jump = readShort(file)
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for i = 1, jump - 1 do
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tSong[#tSong + 1] = {}
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end
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return jump > 0
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end
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-- read the notes in a tick
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-- TODO cleanup, move checks to player:nbs.lua
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local function readTick(file)
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local t = {}
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local n = 0
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local jump = readShort(file)
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while jump > 0 do
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n = n + jump
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write(".")
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local instrument = file.read() + 1
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if instrument > 16 then
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return nil, "(v5) Can't convert custom instruments"
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end
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local note = file.read() - 33
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local velocity = file.read()
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local pan = file.read()
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local pitch_mod = readShort(file)
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if note < 0 or note > 24 then
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return nil, "(v5) Notes must be in Minecraft's 2 octaves (" .. note .. ")"
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end
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if not t[instrument] then
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t[instrument] = {}
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end
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t[instrument][n] = note
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jump = readShort(file)
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end
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return t
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end
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-- API functions
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-- save a converted song to a file
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function nbs5.saveSong(tSong, sPath)
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local file = fs.open(sPath, "w")
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if file then
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file.write(textutils.serialize(tSong))
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file.close()
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return true
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end
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return false, "Error opening file "..sPath
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end
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-- save a song as an NBS v5 file
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function nbs5.saveSongNBS(tSong, sPath)
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end
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-- load and convert an .nbs file and save it
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function nbs5.load(sPath, bVerbose)
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local file = fs.open(sPath, "rb")
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if file then
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if bVerbose then
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print("Reading header...")
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end
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local tSong = {}
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local header = readNBSHeader(file)
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tSong.header = header
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tSong.name = header.name
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tSong.author = header.author
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tSong.original_author = header.original_author
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tSong.lenght = header.lenght / header.tempo
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tSong.delay = 1 / header.tempo
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if bVerbose then
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print("Reading ticks...")
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end
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if header.nbs_version == 0 then
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while nextTick(file, tSong) do
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local tick, err = readTick(file, tSong)
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if tick then
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table.insert(tSong, tick)
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else
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file.close()
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return nil, err
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end
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yield()
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end
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pcall(function()
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local layers = {}
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for i=1, header.height do
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table.insert(layers, {
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name=readString(file),
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volume=file.read() + 0
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})
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end
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tSong.layers = layers
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local insts = {}
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for i=1, file.read() + 0 do
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insts[#insts + 1] = {
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name = readString(file),
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file = readString(file),
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pitch = file.read() + 0,
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key = (file.read() + 0) ~= 0
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}
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end
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tSong.instruments = insts
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end)
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else
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while nextTick(file, tSong) do
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local tick, err = readTick(file, tSong)
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if tick then
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table.insert(tSong, tick)
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else
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file.close()
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return nil, err
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end
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yield()
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end
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pcall(function()
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local layers = {}
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for i=1, header.height do
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table.insert(layers, {
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name = readString(file),
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lock = file.read(),
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volume = file.read(),
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pan = file.read()
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})
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end
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tSong.layers = layers
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local insts = {}
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for i=1, file.read() + 0 do
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insts[#insts + 1] = {
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name = readString(file),
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file = readString(file),
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pitch = file.read() + 0,
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key = (file.read() + 0) ~= 0
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}
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end
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tSong.instruments = insts
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end)
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end
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file.close()
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return tSong
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end
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return nil, "Error opening file "..sPath
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end
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return nbs5
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