feat(ts) add hand-crafted types for red

types/hand-crafted/modules/red/red.d.ts

@@ -0,0 +1,41 @@
+// https://github.com/Microsoft/TypeScript/blob/main/src/lib/webworker.generated.d.ts
+interface RTCEncodedAudioFrameMetadata {
+    contributingSources?: number[];
+    synchronizationSource?: number;
+}
+interface RTCEncodedAudioFrame {
+    data: ArrayBuffer;
+    readonly timestamp: number;
+    getMetadata(): RTCEncodedAudioFrameMetadata;
+}
+/**
+ * An encoder for RFC 2198 redundancy using WebRTC Insertable Streams.
+ */
+export class RFC2198Encoder {
+    /**
+     * @param {Number} targetRedundancy the desired amount of redundancy.
+     */
+    constructor(targetRedundancy?: number);
+    targetRedundancy: number;
+    frameBuffer: any[];
+    payloadType: number;
+    /**
+     * Set the desired level of redudancy. 4 means "four redundant frames plus current frame.
+     * It is possible to reduce this to 0 to minimize the overhead to one byte.
+     * @param {Number} targetRedundancy the desired amount of redundancy.
+     */
+    setRedundancy(targetRedundancy: number): void;
+    /**
+     * Set the "inner opus payload type". This is typically our RED payload type that we tell
+     * the other side as our opus payload type. Can be queried from the sender using getParameters()
+     * after setting the answer.
+     * @param {Number} payloadType the payload type to use for opus.
+     */
+    setPayloadType(payloadType: number): void;
+    /**
+     * This is the actual transform to add redundancy to a raw opus frame.
+     * @param {RTCEncodedAudioFrame} encodedFrame - Encoded audio frame.
+     * @param {TransformStreamDefaultController} controller - TransportStreamController.
+     */
+    addRedundancy(encodedFrame: RTCEncodedAudioFrame, controller: TransformStreamDefaultController): void;
+}