Add own encoded sample classes and port the code to them

src/sample.ts

@@ -0,0 +1,84 @@
+export const PLACEHOLDER_DATA = new Uint8Array(0);
+
+/** @public */
+export type SampleType = 'key' | 'delta';
+
+/** @public */
+export class EncodedVideoSample {
+	constructor(
+		public readonly data: Uint8Array,
+		public readonly type: SampleType,
+		public readonly timestamp: number,
+		public readonly duration: number,
+		public readonly byteLength = data.byteLength,
+	) {}
+
+	get isMetadataOnly() {
+		return this.data === PLACEHOLDER_DATA;
+	}
+
+	get microsecondTimestamp() {
+		return Math.floor(1e6 * this.timestamp);
+	}
+
+	get microsecondDuration() {
+		return Math.floor(1e6 * this.duration);
+	}
+
+	toEncodedVideoChunk() {
+		if (this.isMetadataOnly) {
+			throw new TypeError('Metadata-only samples cannot be converted to a chunk.');
+		}
+
+		if (typeof EncodedVideoChunk === 'undefined') {
+			throw new Error('Your browser does not support EncodedVideoChunk.');
+		}
+
+		return new EncodedVideoChunk({
+			data: this.data,
+			type: this.type,
+			timestamp: this.microsecondTimestamp,
+			duration: this.microsecondDuration,
+		});
+	}
+}
+
+/** @public */
+export class EncodedAudioSample {
+	constructor(
+		public readonly data: Uint8Array,
+		public readonly type: SampleType,
+		public readonly timestamp: number,
+		public readonly duration: number,
+		public readonly byteLength = data.byteLength,
+	) {}
+
+	get isMetadataOnly() {
+		return this.data === PLACEHOLDER_DATA;
+	}
+
+	get microsecondTimestamp() {
+		return Math.floor(1e6 * this.timestamp);
+	}
+
+	get microsecondDuration() {
+		return Math.floor(1e6 * this.duration);
+	}
+
+	toEncodedAudioChunk() {
+		if (this.isMetadataOnly) {
+			throw new TypeError('Metadata-only samples cannot be converted to a chunk.');
+		}
+
+		if (typeof EncodedAudioChunk === 'undefined') {
+			throw new Error('Your browser does not support EncodedAudioChunk.');
+		}
+
+		return new EncodedAudioChunk({
+			data: this.data,
+			type: this.type,
+			timestamp: this.microsecondTimestamp,
+			duration: this.microsecondDuration,
+		});
+	}
+}