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Video/MiroTalk SFU/public/js/Helpers.js

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+'use strict';
+
+class MixedAudioRecorder {
+    constructor(useGainNode = true) {
+        this.useGainNode = useGainNode;
+        this.gainNode = null;
+        this.audioSources = [];
+        this.audioDestination = null;
+        this.audioContext = this.createAudioContext();
+    }
+
+    createAudioContext() {
+        if (window.AudioContext) {
+            return new AudioContext();
+        } else if (window.webkitAudioContext) {
+            return new webkitAudioContext();
+        } else if (window.mozAudioContext) {
+            return new mozAudioContext();
+        } else {
+            throw new Error('Web Audio API is not supported in this browser');
+        }
+    }
+
+    getMixedAudioStream(audioStreams) {
+        this.audioSources = [];
+
+        if (this.useGainNode) {
+            this.gainNode = this.audioContext.createGain();
+            this.gainNode.connect(this.audioContext.destination);
+            this.gainNode.gain.value = 0;
+        }
+
+        audioStreams.forEach((stream) => {
+            if (!stream || !stream.getTracks().filter((t) => t.kind === 'audio').length) {
+                return;
+            }
+
+            console.log('Mixed audio tracks to add on MediaStreamAudioDestinationNode --->', stream.getTracks());
+
+            let audioSource = this.audioContext.createMediaStreamSource(stream);
+
+            if (this.useGainNode) {
+                audioSource.connect(this.gainNode);
+            }
+            this.audioSources.push(audioSource);
+        });
+
+        this.audioDestination = this.audioContext.createMediaStreamDestination();
+        this.audioSources.forEach((audioSource) => {
+            audioSource.connect(this.audioDestination);
+        });
+
+        return this.audioDestination.stream;
+    }
+
+    stopMixedAudioStream() {
+        if (this.useGainNode) {
+            this.gainNode.disconnect();
+            this.gainNode = null;
+        }
+        if (this.audioSources.length) {
+            this.audioSources.forEach((source) => {
+                source.disconnect();
+            });
+            this.audioSources = [];
+        }
+        if (this.audioDestination) {
+            this.audioDestination.disconnect();
+            this.audioDestination = null;
+        }
+        if (this.audioContext) {
+            this.audioContext.close();
+            this.audioContext = null;
+        }
+        console.log('Stop Mixed Audio Stream');
+    }
+}
+
+// Usage
+// const audioRecorder = new MixedAudioRecorder();
+// To start recording, call audioRecorder.getMixedAudioStream(audioStreams);
+// To stop recording, call audioRecorder.stopMixedAudioStream();
+// Credits: https://github.com/muaz-khan/MultiStreamsMixer