Refactor method CmcdLog.createInstance to accept bufferedDurationUs

Instead of providing `playbackDurationUs` and `loadPositionUs` individually, which are used to calculate the buffer duration for CMCD logging, we can directly pass the pre-calculated `bufferedDurationUs` available in the `getNextChunk` method of the chunk source classes.

Issue: google/ExoPlayer#8699

#minor-release

PiperOrigin-RevId: 540630112

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/upstream/CmcdLog.java

@@ -42,14 +42,13 @@ public final class CmcdLog {
    *
    * @param cmcdConfiguration The {@link CmcdConfiguration} for this chunk source.
    * @param trackSelection The {@linkplain ExoTrackSelection track selection}.
-   * @param playbackPositionUs The current playback position in microseconds.
-   * @param loadPositionUs The current load position in microseconds.
+   * @param bufferedDurationUs The duration of media currently buffered from the current playback
+   *     position, in microseconds.
    */
   public static CmcdLog createInstance(
       CmcdConfiguration cmcdConfiguration,
       ExoTrackSelection trackSelection,
-      long playbackPositionUs,
-      long loadPositionUs) {
+      long bufferedDurationUs) {
     ImmutableMap<@CmcdConfiguration.HeaderKey String, String> customData =
         cmcdConfiguration.requestConfig.getCustomData();
     int bitrateKbps = trackSelection.getSelectedFormat().bitrate / 1000;
@@ -65,8 +64,7 @@ public final class CmcdLog {
         new CmcdLog.CmcdRequest.Builder()
             .setCustomData(customData.get(CmcdConfiguration.KEY_CMCD_REQUEST));
     if (cmcdConfiguration.isBufferLengthLoggingAllowed()) {
-      cmcdRequest.setBufferLengthMs(
-          loadPositionUs == C.TIME_UNSET ? 0 : (loadPositionUs - playbackPositionUs) / 1000);
+      cmcdRequest.setBufferLengthMs(bufferedDurationUs / 1000);
     }
 
     CmcdLog.CmcdSession.Builder cmcdSession =

libraries/exoplayer/src/test/java/androidx/media3/exoplayer/upstream/CmcdLogTest.java

@@ -60,10 +60,7 @@ public class CmcdLogTest {
         .thenReturn(new Format.Builder().setPeakBitrate(840_000).build());
     CmcdLog cmcdLog =
         CmcdLog.createInstance(
-            cmcdConfiguration,
-            trackSelection,
-            /* playbackPositionUs= */ 1_000_000,
-            /* loadPositionUs= */ 2_760_000);
+            cmcdConfiguration, trackSelection, /* bufferedDurationUs= */ 1_760_000);
 
     ImmutableMap<@CmcdConfiguration.HeaderKey String, String> requestHeaders =
         cmcdLog.getHttpRequestHeaders();

libraries/exoplayer_dash/src/main/java/androidx/media3/exoplayer/dash/DefaultDashChunkSource.java

@@ -374,8 +374,7 @@ public class DefaultDashChunkSource implements DashChunkSource {
     CmcdLog cmcdLog =
         cmcdConfiguration == null
             ? null
-            : CmcdLog.createInstance(
-                cmcdConfiguration, trackSelection, playbackPositionUs, loadPositionUs);
+            : CmcdLog.createInstance(cmcdConfiguration, trackSelection, bufferedDurationUs);
 
     RepresentationHolder representationHolder =
         updateSelectedBaseUrl(trackSelection.getSelectedIndex());

libraries/exoplayer_hls/src/main/java/androidx/media3/exoplayer/hls/HlsChunkSource.java

@@ -483,8 +483,7 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
     CmcdLog cmcdLog =
         cmcdConfiguration == null
             ? null
-            : CmcdLog.createInstance(
-                cmcdConfiguration, trackSelection, playbackPositionUs, loadPositionUs);
+            : CmcdLog.createInstance(cmcdConfiguration, trackSelection, bufferedDurationUs);
 
     // Check if the media segment or its initialization segment are fully encrypted.
     @Nullable

libraries/exoplayer_smoothstreaming/src/main/java/androidx/media3/exoplayer/smoothstreaming/DefaultSsChunkSource.java

@@ -284,9 +284,7 @@ public class DefaultSsChunkSource implements SsChunkSource {
     CmcdLog cmcdLog =
         cmcdConfiguration == null
             ? null
-            : CmcdLog.createInstance(
-                cmcdConfiguration, trackSelection, playbackPositionUs, loadPositionUs);
-    ;
+            : CmcdLog.createInstance(cmcdConfiguration, trackSelection, bufferedDurationUs);
 
     out.chunk =
         newMediaChunk(