some WebAudio interface missing methods

webaudioapi/waa.d.ts

@@ -171,3 +171,35 @@ declare enum OscillatorType {
   triangle,
   custom
 }
+
+interface AudioContextConstructor {
+    new(): AudioContext;
+}
+
+interface Window {
+    AudioContext: AudioContextConstructor;
+}
+
+interface AudioContext {
+    createMediaStreamSource(stream: MediaStream): MediaStreamAudioSourceNode;
+}
+
+interface MediaStreamAudioSourceNode extends AudioNode {
+    
+}
+
+interface AudioBuffer {
+    copyFromChannel(destination: Float32Array, channelNumber: number, startInChannel?: number): void;
+    
+    copyToChannel(source: Float32Array, channelNumber: number, startInChannel?: number): void;
+}
+
+interface AudioNode {
+    disconnect(destination: AudioNode): void;
+}
+
+interface AudioContext {
+    suspend(): Promise<void>;
+    resume(): Promise<void>;
+    close(): Promise<void>;
+}