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Wip/25 add gain node #32

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Wip/25 add gain node #32

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f486183
[#25] Adding GainNode
muuki88 Feb 4, 2017
d3d9af1
Adding gain configuration to IStreamClientOptions
muuki88 Feb 19, 2017
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6 changes: 6 additions & 0 deletions ts/Interfaces.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -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;
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16 changes: 15 additions & 1 deletion ts/Stream/StreamClient.ts
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Expand Up @@ -15,6 +15,7 @@ class StreamClient {

private audioContext: AudioContext;
private mediaStreamSource: MediaStreamAudioSourceNode;
private gainNode: GainNode;
private userSpeechAnalyser: AnalyserNode;
private recorder: Recorder;
private resampleProcessor;
Expand All @@ -29,7 +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();

Expand Down Expand Up @@ -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.createGainNode();
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");
Expand All @@ -185,6 +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");
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