Fix SourceRef race conditions, fix "source" and "target" getter returning unused instances, add missing validation, make "getDurationFromMetadata" only exist on tracks, fix examples, expand media player to support live playback, change the signatures of some Input APIs

src/flac/flac-demuxer.ts

@@ -97,17 +97,6 @@ export class FlacDemuxer extends Demuxer {
 		return [this.trackBacking];
 	}
 
-	async getDurationFromMetadata(): Promise<number | null> {
-		await this.readMetadata();
-		assert(this.audioInfo);
-
-		if (this.audioInfo.totalSamples === 0) {
-			return null;
-		}
-
-		return this.audioInfo.totalSamples / this.audioInfo.sampleRate;
-	}
-
 	async getMimeType() {
 		return 'audio/flac';
 	}
@@ -618,8 +607,14 @@ class FlacAudioTrackBacking implements InputAudioTrackBacking {
 		return null;
 	}
 
-	getDurationFromMetadata() {
-		return this.demuxer.getDurationFromMetadata();
+	async getDurationFromMetadata() {
+		assert(this.demuxer.audioInfo);
+
+		if (this.demuxer.audioInfo.totalSamples === 0) {
+			return null;
+		}
+
+		return this.demuxer.audioInfo.totalSamples / this.demuxer.audioInfo.sampleRate;
 	}
 
 	async getLiveRefreshInterval() {