From f48618394ee1daaa1214e41ba38ff518ea0e9c4a Mon Sep 17 00:00:00 2001
From: Nepomuk Seiler <nepomuk.seiler@mukis.de>
Date: Sat, 4 Feb 2017 21:11:58 +0100
Subject: [PATCH 1/2] [#25] Adding GainNode

---
 ts/Stream/StreamClient.ts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/ts/Stream/StreamClient.ts b/ts/Stream/StreamClient.ts
index bb86154..8237b4c 100644
--- a/ts/Stream/StreamClient.ts
+++ b/ts/Stream/StreamClient.ts
@@ -15,6 +15,7 @@ class StreamClient {
 
     private audioContext: AudioContext;
     private mediaStreamSource: MediaStreamAudioSourceNode;
+    private gainNode: GainNode;
     private userSpeechAnalyser: AnalyserNode;
     private recorder: Recorder;
     private resampleProcessor;
@@ -175,7 +176,14 @@ class StreamClient {
 
         this.mediaStreamSource = this.audioContext.createMediaStreamSource(stream);
         this.onEvent(IStreamClient.EVENT.MSG_MEDIA_STREAM_CREATED, "Media stream created");
+
+        // create audio nodes
+        this.gainNode = this.audioContext.createGain();
         this.userSpeechAnalyser = this.audioContext.createAnalyser();
+
+        // connect: input ~> gain ~> userSpeechAnalyser ~> output
+        this.mediaStreamSource.connect(this.gainNode);
+        this.gainNode.connect(this.userSpeechAnalyser);
         this.mediaStreamSource.connect(this.userSpeechAnalyser);
         this.recorder = new Recorder(this.mediaStreamSource);
         this.onEvent(IStreamClient.EVENT.MSG_INIT_RECORDER, "Recorder initialized");

From d3d9af1a4d8a4ab14a48cd9abee8ad15b41ff3df Mon Sep 17 00:00:00 2001
From: Nepomuk Seiler <nepomuk.seiler@mukis.de>
Date: Sun, 19 Feb 2017 12:50:51 +0100
Subject: [PATCH 2/2] Adding gain configuration to IStreamClientOptions

---
 ts/Interfaces.ts          |  6 ++++++
 ts/Stream/StreamClient.ts | 10 ++++++++--
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/ts/Interfaces.ts b/ts/Interfaces.ts
index aceffc6..11e7a10 100644
--- a/ts/Interfaces.ts
+++ b/ts/Interfaces.ts
@@ -55,6 +55,12 @@ export interface IStreamClientOptions {
     lang?: Constants.AVAILABLE_LANGUAGES;
     contentType?: string;
     readingInterval?: string;
+    /**
+     * Set the applied gain for the processed audio stream.
+     *
+     * @type {number}
+     */
+    gain?: number;
     onOpen?: () => void;
     onClose?: () => void;
     onInit?: () => void;
diff --git a/ts/Stream/StreamClient.ts b/ts/Stream/StreamClient.ts
index 8237b4c..74d17aa 100644
--- a/ts/Stream/StreamClient.ts
+++ b/ts/Stream/StreamClient.ts
@@ -30,7 +30,7 @@ class StreamClient {
     private onOpen; private onClose; private onInit; private onStartListening;
     private onStopListening; private onResults; private onEvent; private onError;
 
-    constructor(config: IStreamClientOptions = {}) {
+    constructor(private config: IStreamClientOptions = {}) {
 
         Processors.bindProcessors();
 
@@ -178,7 +178,7 @@ class StreamClient {
         this.onEvent(IStreamClient.EVENT.MSG_MEDIA_STREAM_CREATED, "Media stream created");
 
         // create audio nodes
-        this.gainNode = this.audioContext.createGain();
+        this.gainNode = this.createGainNode();
         this.userSpeechAnalyser = this.audioContext.createAnalyser();
 
         // connect: input ~> gain ~> userSpeechAnalyser ~> output
@@ -193,6 +193,12 @@ class StreamClient {
         }
     }
 
+    private createGainNode(): GainNode {
+        const gainNode = this.audioContext.createGain();
+        gainNode.gain.value = this.config.gain || gainNode.gain.defaultValue;
+        return gainNode;
+    }
+
     private openWebSocket() {
         if (!this.recorder) {
             this.onError(IStreamClient.ERROR.ERR_AUDIO, "Recorder undefined");