Simplify computeFinalIndexSeekerDurationUs

Author: icbaker

libraries/extractor/src/main/java/androidx/media3/extractor/mp3/Mp3Extractor.java

@@ -399,18 +399,11 @@ private long computeTimeUs(long samplesRead) {
    * initially gapless Xing/Info duration with the longer encoded duration.
    */
   private long computeFinalIndexSeekerDurationUs(long samplesRead) {
-    long durationUs = computeTimeUs(samplesRead);
-    if (!gaplessInfoHolder.hasGaplessInfo()) {
-      return durationUs;
-    }
     long finalGaplessSampleIndex =
-        Util.durationUsToSampleCount(durationUs, synchronizedHeader.sampleRate)
-            - gaplessInfoHolder.encoderDelay
-            - gaplessInfoHolder.encoderPadding
-            - 1;
-    return finalGaplessSampleIndex >= 0
-        ? Util.sampleCountToDurationUs(finalGaplessSampleIndex, synchronizedHeader.sampleRate)
-        : C.TIME_UNSET;
+        gaplessInfoHolder.hasGaplessInfo()
+            ? samplesRead - gaplessInfoHolder.encoderDelay - gaplessInfoHolder.encoderPadding - 1
+            : samplesRead;
+    return finalGaplessSampleIndex >= 0 ? computeTimeUs(finalGaplessSampleIndex) : C.TIME_UNSET;
   }
 
   private boolean synchronize(ExtractorInput input, boolean sniffing) throws IOException {