Refactor HLS API: Get rid of specialized Manifest* classes, use Input instead. Add unhydrated InputTracks, InputTrack compatibility, InputTrack queries

src/mp3/mp3-demuxer.ts

@@ -217,6 +217,22 @@ class Mp3AudioTrackBacking implements InputAudioTrackBacking {
 		return this.demuxer.firstFrameHeader.sampleRate / this.demuxer.firstFrameHeader.audioSamplesInFrame;
 	}
 
+	getGroupId() {
+		return this.getId();
+	}
+
+	getPairingMask() {
+		return 1n;
+	}
+
+	getBitrate() {
+		return null;
+	}
+
+	getAverageBitrate() {
+		return null;
+	}
+
 	getName() {
 		return null;
 	}
@@ -249,10 +265,6 @@ class Mp3AudioTrackBacking implements InputAudioTrackBacking {
 		};
 	}
 
-	getVariant() {
-		return null;
-	}
-
 	async getDecoderConfig(): Promise<AudioDecoderConfig> {
 		assert(this.demuxer.firstFrameHeader);