wyozi / gmod-medialib

gmod-medialib

Media library for Garry's Mod.

Workaround as of 2018/09/30

Awesomium (the embedded web browser) in Garry's Mod doesn't work with Youtube. To fix this you need to use the chromium branch for Garry's Mod. See #64 for details.

Setup

1. Download medialib.lua or minimized medialib.min.lua from https://github.com/wyozi/gmod-medialib/releases/latest and place into your addon/gamemode
2. Make sure it is available to clients via AddCSLuaFile
3. Include it where-ever you need it. See best-practises below:
   • local medialib = include("the/path/to/medialib.lua") if you only use it in one file
   • MyGlobalTable.medialib = include("the/path/to/medialib.lua") if you use it multiple times (you need to refer to medialib as MyGlobalTable.medialib or localize it if you do this)
4. Setup API keys as needed (see Configuration section below)

Configuration

Medialib offers some configuration options that can be set by setting members of the imported medialib object.

-- Example library import
local medialib = include("medialib.lua")

-- SoundCloud API key. Required for SoundCloud service
-- Can also be a table in which case a random key is picked for each query.
medialib.SOUNDCLOUD_API_KEY = "my-key-here"

-- Youtube API key. Required for Youtube service
-- If you want to generate your own you can do so at https://console.developers.google.com/apis/dashboard
medialib.YOUTUBE_API_KEY = "my-key-here"

-- The maximum number of HTML panel instances in the HTML pool
-- Set this to a sensible number (1-5) if you spawn a lot of HTML medias
medialib.MAX_HTMLPOOL_INSTANCES = 0

Example

-- If existing global reference exists, remove them
if IsValid(CLIP) then CLIP:stop() end

local link = "https://www.youtube.com/watch?v=6IqKEeRS90A"

-- Get the service that this link uses (eg. youtube, twitch, vimeo, webaudio)
local service = medialib.load("media").guessService(link)

-- Create a mediaclip from the link
local mediaclip = service:load(link)

-- Store global reference for debugging purposes
CLIP = mediaclip

-- Play media
mediaclip:play()

-- Draw video
hook.Add("HUDPaint", "DrawVideo", function()
	local w = 500
	local h = w * (9/16)

	mediaclip:draw(0, 0, w, h)

	surface.SetDrawColor(255, 255, 255)
	surface.DrawRect(0, h, w, 25)

	-- Request metadata. 'meta' will be nil if metadata is still being fetched.
	-- Note: this is a clientside shortcut to Service#query. You should use Service#query on serverside.
	local meta = mediaclip:lookupMetadata()

	local title, duration = tostring(meta and meta.title),
							(meta and meta.duration) or 0

	draw.SimpleText(title, "DermaDefaultBold", 5, h+3, Color(0, 0, 0))

	local timeStr = string.format("%.1f / %.1f", mediaclip:getTime(), duration)
	draw.SimpleText(timeStr, "DermaDefaultBold", w - 5, h+3, Color(0, 0, 0), TEXT_ALIGN_RIGHT)
end)

See examples/ for more elaborate examples.

Resource usage

• Server ⇋ Client

Medialib provides no means of communication between server and client. This means that to for example synchronize video between clients, you must handle networking the media URL and the media start time yourself.

For this purpose you might find my NetTable library useful, but medialib itself contains no networking code.

• Client

On clientside medialib uses either HTML Awesomium panels or BASS sound objects for playback.

HTML panels are relatively expensive way to playback videos, but having one or two of them should work fine. BASS sound objects (which are used for webaudio and webradio) are pretty cheap. There should be no problem having many of them playing at the same time if needed.

In a nutshell you should use mp3 or ogg files when possible, as they are way cheaper for media playback, but for things like media players that must accept Youtube links HTML media works fine. If there can be arbitrary amount of player controlled jukeboxes on the map, you might want to add some limitations so eg. more than two cannot play simultaneously.

• Shared (server and client)

Both server and client have the ability to query for video metadata.

This is not instant, as HTTP queries used for majority of services take their time, but querying for metadata is pretty cheap as long as you don't do it in a Think hook or similar.

API

Events

Media

Hooks

Medialib calls some hooks. You can use Garry's Mod's hook.Add to hook them and modify extend medialib's functionality.

Medialib_ProcessOpts(Media mediaObj, table opts) Called before media is loaded but after it is created with the options passed to Service:load(url, options). You can use this hook to add new methods to the media object or set variables. Maybe even queue some things with Media:runCommand(fn).

Medialib_ExtendQuery(string url, CallbackChainObj cbchain) Can be used to add additional data to queried data. Because data querying requires callbacks and medialib doesn't have promises, it uses really hardcore callback chainer, which can be found from servicebase.lua.