Update index.html

index.html

@@ -1430,30 +1430,44 @@ document.getElementById('sw-register-btn').addEventListener('click', registerSer
         updateVolumeIcon();
     }
 
-    // 再生速度を適用（ピッチ維持）
-    function applyPlaybackRate() {
-        if (!isAudioCombined) return;
+function applyPlaybackRate() {
+    if (!isAudioCombined) return;
+    
+    const speed = parseFloat(playbackSpeedSlider.value);
+    currentPlaybackRate = speed;
+    video.playbackRate = speed;
+    
+    if (combinedAudioSource) {
+        // 既存のオーディオソースを停止
+        combinedAudioSource.stop();
         
-        const speed = parseFloat(playbackSpeedSlider.value);
-        currentPlaybackRate = speed;
-        video.playbackRate = speed;
+        // 新しいオーディオソースを作成
+        combinedAudioSource = audioContext.createBufferSource();
+        combinedAudioSource.buffer = combinedAudioBuffer;
+        combinedAudioSource.connect(audioContext.destination);
         
-        if (combinedAudioSource) {
-            combinedAudioSource.playbackRate.value = speed;
-            // ピッチを維持する設定
-            if ('preservesPitch' in combinedAudioSource) {
-                combinedAudioSource.preservesPitch = true;
-            } else if ('webkitPreservesPitch' in combinedAudioSource) {
-                combinedAudioSource.webkitPreservesPitch = true;
-            } else if ('mozPreservesPitch' in combinedAudioSource) {
-                combinedAudioSource.mozPreservesPitch = true;
-            }
+        // ピッチ維持設定を一度だけ行う
+        if ('preservesPitch' in combinedAudioSource) {
+            combinedAudioSource.preservesPitch = true;
+        } else if ('webkitPreservesPitch' in combinedAudioSource) {
+            combinedAudioSource.webkitPreservesPitch = true;
+        } else if ('mozPreservesPitch' in combinedAudioSource) {
+            combinedAudioSource.mozPreservesPitch = true;
         }
         
-        speedValue.textContent = speed.toFixed(2) + 'x';
-        playbackSpeedValue.textContent = speed.toFixed(2) + 'x';
-        speedSlider.value = speed;
+        // 再生速度を設定
+        combinedAudioSource.playbackRate.value = speed;
+        
+        // 再生中なら新しいソースで再生を続ける
+        if (isPlaying) {
+            combinedAudioSource.start(0, video.currentTime);
+        }
     }
+    
+    speedValue.textContent = speed.toFixed(2) + 'x';
+    playbackSpeedValue.textContent = speed.toFixed(2) + 'x';
+    speedSlider.value = speed;
+}
 document.addEventListener('visibilitychange', function() {
     if (document.hidden) {
         // タブが非アクティブになったら同期チェックを停止