getBufferedPosition can't return unknown anymore

library/src/main/java/com/google/android/exoplayer/MultiSampleSource.java

@@ -139,18 +139,14 @@ public final class MultiSampleSource implements SampleSource {
 
 
   @Override
   @Override
   public long getBufferedPositionUs() {
   public long getBufferedPositionUs() {
-    long bufferedPositionUs = durationUs != C.UNSET_TIME_US ? durationUs : Long.MAX_VALUE;
+    long bufferedPositionUs = Long.MAX_VALUE;
     for (SampleSource source : enabledSources) {
     for (SampleSource source : enabledSources) {
       long rendererBufferedPositionUs = source.getBufferedPositionUs();
       long rendererBufferedPositionUs = source.getBufferedPositionUs();
-      if (rendererBufferedPositionUs == C.UNSET_TIME_US) {
-        return C.UNSET_TIME_US;
-      } else if (rendererBufferedPositionUs == C.END_OF_SOURCE_US) {
-        // This source is fully buffered.
-      } else {
+      if (rendererBufferedPositionUs != C.END_OF_SOURCE_US) {
         bufferedPositionUs = Math.min(bufferedPositionUs, rendererBufferedPositionUs);
         bufferedPositionUs = Math.min(bufferedPositionUs, rendererBufferedPositionUs);
       }
       }
     }
     }
-    return bufferedPositionUs == Long.MAX_VALUE ? C.UNSET_TIME_US : bufferedPositionUs;
+    return bufferedPositionUs == Long.MAX_VALUE ? C.END_OF_SOURCE_US : bufferedPositionUs;
   }
   }
 
 
   @Override
   @Override

library/src/main/java/com/google/android/exoplayer/SampleSource.java

@@ -101,8 +101,7 @@ public interface SampleSource {
    * This method should only be called when at least one track is selected.
    * This method should only be called when at least one track is selected.
    *
    *
    * @return An estimate of the absolute position in microseconds up to which data is buffered, or
    * @return An estimate of the absolute position in microseconds up to which data is buffered, or
-   *     {@link C#END_OF_SOURCE_US} if the track is fully buffered, or {@link C#UNSET_TIME_US} if no
-   *     estimate is available.
+   *     {@link C#END_OF_SOURCE_US} if the track is fully buffered.
    */
    */
   long getBufferedPositionUs();
   long getBufferedPositionUs();