srt.lua

A pure lua library to for SubRip (SRT) file parsing

To do:

• Improve performance
• Extended formatting
  • Position flags
  • HTML Color and format like italic, bold, Underlined and everything in between
  • Other formats like strike through

Features

• Simple API
• Easy to work with

Flaws

• Janky parsing routine
• Inefficient
• Probably will break if the time reaches over 99 hours

Getting started

1. 📡 Get a copy of srt.lua from the Official Repository or From Luarocks
2. 💾 Copy srt.lua where you like to use it, or just on the root directory of the project
3. ⚙ Add it to your project like this

   local srt = require("path/to/srt")

4. 📃 Pass a plain text representation of the file

   local captionsData = io.read("path/to/captions")
   local captionsObject = srt.new(captionsData)

5. 🎬 Tell in what part of the media we are right now, since this is a generic pure lua function a better example is done with the LÖVE2D framework, so we can get a real world example

   local coolVideo = love.graphics.newVideo("path/to/cool/video.ogg")
   
   function love.update(dt)
   	--A media source on love returns a number in seconds when the method :tell() is called
   	--srt.lua takes the elapsed time in seconds so be aware of passing seconds as an integer
   	local tellTime = coolVideo:tell()
   
   	--We pass the time elapsed in seconds
   	captionsObject:setTime(tellTime)
   
   	--We tell srt.lua to apply changes, an optional argument is the delta so we account the lag
   	--This method has been deprecated since setTime calls it internally but has not been removed
   	--For the lag compensation feature that has. Beware of not using it alone since you could get
   	--out of sync with the media being played with.
   	captionsObject:update(dt)
   end

6. 💎 Profit. (jokes aside once changes are applied we can ask for the text and use it, ⚠ But take note that the result is raw from the file, so any gibberish has to be cleaned manually r/NotMyJob)

   function love.draw()
   	--We draw the video
   	love.graphics.draw(coolVideo)
   
   	--We draw the subs
   	love.graphics.setFont(48)
   	local captionsText = captionsObject:getText()
   	local windowWidth, windowHeight = love.graphics.getDimensions()
   	love.graphics.print(captionsText, 0, windowHeight - 48)
   end
   

Here's an example: