Util.getStringForTime() prefixes negative times

Fix bug to place the negative sign in the beginning
of the returned String.

PiperOrigin-RevId: 333504868

library/common/src/main/java/com/google/android/exoplayer2/util/Util.java

@@ -17,6 +17,7 @@ package com.google.android.exoplayer2.util;
 
 import static android.content.Context.UI_MODE_SERVICE;
 import static com.google.android.exoplayer2.util.Assertions.checkNotNull;
+import static java.lang.Math.abs;
 import static java.lang.Math.max;
 import static java.lang.Math.min;
 
@@ -1847,13 +1848,16 @@ public final class Util {
     if (timeMs == C.TIME_UNSET) {
       timeMs = 0;
     }
+    String prefix = timeMs < 0 ? "-" : "";
+    timeMs = abs(timeMs);
     long totalSeconds = (timeMs + 500) / 1000;
     long seconds = totalSeconds % 60;
     long minutes = (totalSeconds / 60) % 60;
     long hours = totalSeconds / 3600;
     builder.setLength(0);
-    return hours > 0 ? formatter.format("%d:%02d:%02d", hours, minutes, seconds).toString()
-        : formatter.format("%02d:%02d", minutes, seconds).toString();
+    return hours > 0
+        ? formatter.format("%s%d:%02d:%02d", prefix, hours, minutes, seconds).toString()
+        : formatter.format("%s%02d:%02d", prefix, minutes, seconds).toString();
   }
 
   /**

library/common/src/test/java/com/google/android/exoplayer2/util/UtilTest.java

@@ -19,6 +19,7 @@ import static com.google.android.exoplayer2.util.Util.binarySearchCeil;
 import static com.google.android.exoplayer2.util.Util.binarySearchFloor;
 import static com.google.android.exoplayer2.util.Util.escapeFileName;
 import static com.google.android.exoplayer2.util.Util.getCodecsOfType;
+import static com.google.android.exoplayer2.util.Util.getStringForTime;
 import static com.google.android.exoplayer2.util.Util.parseXsDateTime;
 import static com.google.android.exoplayer2.util.Util.parseXsDuration;
 import static com.google.android.exoplayer2.util.Util.unescapeFileName;
@@ -37,6 +38,7 @@ import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Formatter;
 import java.util.Random;
 import java.util.zip.Deflater;
 import org.junit.Test;
@@ -1082,6 +1084,12 @@ public class UtilTest {
     assertThat(Util.tableExists(database, "table")).isFalse();
   }
 
+  @Test
+  public void getStringForTime_withNegativeTime_setsNegativePrefix() {
+    assertThat(getStringForTime(new StringBuilder(), new Formatter(), /* timeMs= */ -35000))
+        .isEqualTo("-00:35");
+  }
+
   private static void assertEscapeUnescapeFileName(String fileName, String escapedFileName) {
     assertThat(escapeFileName(fileName)).isEqualTo(escapedFileName);
     assertThat(unescapeFileName(escapedFileName)).isEqualTo(fileName);