obs example added

examples/obs/Gemfile

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+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+gem "voicemeeter", path: "../.."
+
+gem "obsws", "~> 0.1.3"
+
+gem "pathname", "~> 0.2.1"

examples/obs/README.md

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+## Requirements
+
+- [OBS Studio v28+](https://obsproject.com/)
+- [OBSWS Ruby wrapper for Websocket v5](https://github.com/onyx-and-iris/obsws-ruby)
+
+## About
+
+A simple demonstration showing how to sync OBS scene switches to Voicemeeter states.
+
+## Use
+
+The script assumes you have connection info saved in a config yaml file named `config.yaml` placed next to `obs.rb`. It also assumes you have scenes named `START` `BRB` `END` and `LIVE`.
+
+A valid `config.yaml` file might look like this:
+
+```yaml
+connection:
+  host: localhost
+  port: 4455
+  password: strongpassword
+```
+
+Closing OBS will end the script and logout of Voicemeeter.

examples/obs/main.rb

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+require "voicemeeter"
+require "obsws"
+require "yaml"
+require "pathname"
+
+class Observer
+  attr_reader :running
+
+  def initialize(vm, **kwargs)
+    @vm = vm
+    @obsws = OBSWS::Events::Client.new(**kwargs)
+    @obsws.add_observer(self)
+    @running = true
+  end
+
+  def run
+    sleep(0.1) while running
+  end
+
+  def on_start
+    @vm.strip[0].mute = true
+    @vm.strip[1].B1 = true
+    @vm.strip[2].B2 = true
+  end
+
+  def on_live
+    @vm.strip[0].mute = false
+    @vm.strip[7].A3 = true
+    @vm.strip[7].fadeto(-6, 500)
+    @vm.vban.instream[0].on = true
+  end
+
+  def on_brb
+    @vm.strip[0].mute = false
+    @vm.strip[5].A1 = true
+    @vm.strip[5].A2 = true
+    @vm.strip[7].fadeto(0, 500)
+  end
+
+  def on_end
+    @vm.apply({"strip-0" => {mute: true}, "vban-instream-0" => {on: false}})
+  end
+
+  def on_current_program_scene_changed(data)
+    scene = data.scene_name
+    puts "Switched to scene #{scene}"
+    send("on_#{scene.downcase}")
+  end
+
+  def on_exit_started
+    puts "OBS closing!"
+    @obsws.close
+    @running = false
+  end
+end
+
+def conn_from_yml
+  YAML.load_file("config.yaml", symbolize_names: true)[:connection]
+end
+
+
+if $0 == __FILE__
+  Voicemeeter::Remote.new(:potato).run do |vm|
+    Observer.new(vm, **conn_from_yml).run
+  end
+end