-- Helper: Read 16/32-bit Big Endian local function read16() local b1, b2 = file:read(2):byte(1,2); return (b1 << 8) | b2 end local function read32() local b1, b2, b3, b4 = file:read(4):byte(1,2,3,4); return (b1 << 24) | (b2 << 16) | (b3 << 8) | b4 end Download - Aindham Vedham S01 E01-08 Webrip 72... Instant
while file:seek() < trackEnd do local delta = readVLQ() currentTick = currentTick + delta local status = file:read(1):byte() -- Handle running status if status < 0x80 then -- If data byte, we are continuing previous status -- (Implementation skipped for brevity in this snippet) -- In a full parser, you would handle the running status byte logic here. end local eventType = status >> 4 -- Note On (0x9) or Note Off (0x8) if eventType == 0x9 or eventType == 0x8 then local data1 = file:read(1):byte() local data2 = file:read(1):byte() local pitch = data1 local velocity = data2 -- Note On with velocity 0 acts as Note Off if eventType == 0x9 and velocity > 0 then table.insert(eventList, type = "on", tick = currentTick, pitch = pitch, velocity = velocity ) else table.insert(eventList, type = "off", tick = currentTick, pitch = pitch ) end -- Meta Event (0xFF) elseif status == 0xFF then local typeByte = file:read(1):byte() local len = readVLQ() local data = file:read(len) -- Tempo Change if typeByte == 0x51 then tempo = (data:byte(1) << 16) | (data:byte(2) << 8) | data:byte(3) end -- Other events (Control Change, Program Change, etc) else -- Skip data bytes for unsupported events if eventType == 0xC or eventType == 0xD then file:read(1) -- 1 byte else file:read(2) -- 2 bytes end end end file:close() Download Rick Ross Crocodile Python - 3.79.94.248
-- 3. Process eventList to calculate duration and time -- This pairs Note Ons with corresponding Note Offs for _, event in ipairs(eventList) do if event.type == "on" then activeNotes[event.pitch] = event.tick elseif event.type == "off" then local startTick = activeNotes[event.pitch] if startTick then -- Convert Ticks to Seconds: (Ticks / PPQ) * (Tempo / 1,000,000) local startTime = (startTick / ticksPerBeat) * (tempo / 1000000) local endTime = (event.tick / ticksPerBeat) * (tempo / 1000000) table.insert(notes, pitch = event.pitch, time = startTime, duration = endTime - startTime ) activeNotes[event.pitch] = nil end end end
-- Usage Example: -- local midiData = parseMIDI("song.mid") -- for _, note in ipairs(midiData.notes) do -- print(string.format("Note: %d, Start: %.2fs, Duration: %.2fs", note.pitch, note.time, note.duration)) -- end Once you have the midiData table, you can play it in a game loop. Here is a conceptual example for a framework like Löve2D or Roblox:
local notes = {} local activeNotes = {} -- Stores start_tick for currently playing notes local currentTick = 0 local tempo = 500000 -- Default: 120 BPM (microseconds per beat) -- Temporarily store events to calculate duration later local eventList = {}
typically refers to the process of parsing Standard MIDI Files (.mid) and converting their event data (notes, timing, control changes) into a Lua table or script. This is commonly used to drive music or animations in Lua-based game engines (like Löve2D, Roblox, or ComputerCraft).
return ticksPerBeat = ticksPerBeat, tempo = tempo, notes = notes end