From ef14f9b61f1698c6c08df07532abe82d43c74fba Mon Sep 17 00:00:00 2001
From: Jonas Herzig <me@johni0702.de>
Date: Tue, 19 Sep 2017 20:57:08 +0200
Subject: [PATCH] Add push-to-talk voice handler

---
 app/index.js |  4 ++--
 app/voice.js | 30 ++++++++++++++++++++++++++++++
 package.json |  1 +
 3 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/app/index.js b/app/index.js
index fa4e8b2..10005da 100644
--- a/app/index.js
+++ b/app/index.js
@@ -8,7 +8,7 @@ import Resampler from 'libsamplerate.js'
 import ko from 'knockout'
 import _dompurify from 'dompurify'
 
-import { ContinuousVoiceHandler, initVoice } from './voice'
+import { ContinuousVoiceHandler, PushToTalkVoiceHandler, initVoice } from './voice'
 
 const dompurify = _dompurify(window)
 
@@ -309,7 +309,7 @@ class GlobalBindings {
       if (mode === 'cont') {
         voiceHandler = new ContinuousVoiceHandler(this.client)
       } else if (mode === 'ptt') {
-
+        voiceHandler = new PushToTalkVoiceHandler(this.client, 'ctrl + shift')
       } else if (mode === 'vad') {
 
       } else {
diff --git a/app/voice.js b/app/voice.js
index e6fc026..73ac001 100644
--- a/app/voice.js
+++ b/app/voice.js
@@ -4,6 +4,7 @@ import audioContext from 'audio-context'
 import chunker from 'stream-chunker'
 import Resampler from 'libsamplerate.js'
 import getUserMedia from 'getusermedia'
+import keyboardjs from 'keyboardjs'
 
 class VoiceHandler extends Writable {
   constructor (client) {
@@ -44,6 +45,35 @@ export class ContinuousVoiceHandler extends VoiceHandler {
   }
 }
 
+export class PushToTalkVoiceHandler extends VoiceHandler {
+  constructor (client, key) {
+    super(client)
+    this._key = key
+    this._pushed = false
+    this._keydown_handler = () => this._pushed = true
+    this._keyup_handler = () => {
+      this._stopOutbound()
+      this._pushed = false
+    }
+    keyboardjs.bind(this._key, this._keydown_handler, this._keyup_handler)
+  }
+
+  _write (data, _, callback) {
+    if (this._pushed) {
+      this._getOrCreateOutbound().write(data, callback)
+    } else {
+      callback()
+    }
+  }
+
+  _final (callback) {
+    super._final(e => {
+      keyboardjs.unbind(this._key, this._keydown_handler, this._keyup_handler)
+      callback(e)
+    })
+  }
+}
+
 export function initVoice (onData, onUserMediaError) {
   var resampler = new Resampler({
     unsafe: true,
diff --git a/package.json b/package.json
index 53864d9..e6721ff 100644
--- a/package.json
+++ b/package.json
@@ -31,6 +31,7 @@
     "getusermedia": "^2.0.0",
     "html-loader": "^0.4.4",
     "json-loader": "^0.5.4",
+    "keyboardjs": "^2.3.4",
     "knockout": "^3.4.0",
     "lodash.assign": "^4.2.0",
     "microphone-stream": "^3.0.5",