fix: 避免在跳转后旧音频残留在 SoundTouch 缓冲区中导致音频重叠

Author: apoint123

web/src/audio-core/queue/index.ts

@@ -7,6 +7,7 @@ const STATE_READ_INDEX = 2;
 const STATE_WRITE_INDEX = 3;
 const STATE_PLAYBACK_INDEX = 4;
 const STATE_PAUSE_AT_INDEX = 5;
+const STATE_SEEK_GENERATION = 6;
 
 const RING_BUFFER_CAPACITY = 192000 * 2;
 const RING_BUFFER_BYTES_PER_CHANNEL = RING_BUFFER_CAPACITY * 4;
@@ -122,6 +123,7 @@ export interface AudioReader {
 	getPauseAtIndex(): number;
 	clearPauseAtIndex(): void;
 	pausePlayback(): void;
+	getSeekGeneration(): number;
 }
 //#endregion
 
@@ -222,6 +224,7 @@ class AudioQueueCore implements MainAudioController, AudioWriter, AudioReader {
 		Atomics.store(this.controlBlock, STATE_WRITE_INDEX, 0);
 		Atomics.store(this.controlBlock, STATE_READ_INDEX, 0);
 		Atomics.store(this.controlBlock, STATE_PLAYBACK_INDEX, 0);
+		Atomics.add(this.controlBlock, STATE_SEEK_GENERATION, 1);
 		Atomics.notify(this.controlBlock, STATE_READ_INDEX, 1);
 	}
 
@@ -266,6 +269,10 @@ class AudioQueueCore implements MainAudioController, AudioWriter, AudioReader {
 
 		return { isDrained: false };
 	}
+
+	getSeekGeneration(): number {
+		return Atomics.load(this.controlBlock, STATE_SEEK_GENERATION);
+	}
 	//#endregion
 
 	//#region AudioReader

web/src/audio-core/worklet/audio.worklet.ts

@@ -15,7 +15,7 @@ class FFmpegAudioProcessor extends AudioWorkletProcessor {
 	private currentRate: number = 1.0;
 	private playbackFractional: number = 0.0;
 
-	private wasSeeking: boolean = false;
+	private lastSeekGeneration: number = 0;
 
 	constructor() {
 		super();
@@ -73,11 +73,13 @@ class FFmpegAudioProcessor extends AudioWorkletProcessor {
 		}
 
 		const isCurrentlySeeking = this.audioReader.isSeeking();
-		if (this.wasSeeking && !isCurrentlySeeking) {
+		const currentSeekGeneration = this.audioReader.getSeekGeneration();
+
+		if (this.lastSeekGeneration !== currentSeekGeneration) {
 			this.stProcessor.clear();
 			this.playbackFractional = 0.0;
+			this.lastSeekGeneration = currentSeekGeneration;
 		}
-		this.wasSeeking = isCurrentlySeeking;
 
 		if (!this.audioReader.isPlaying() || isCurrentlySeeking) {
 			this.fillSilence(output, WORKLET_BLOCK_SIZE);