Fix position ramping behavior with AudioTrack speed params

Non-realtime AudioTrack playback speed was not taken into account when
extrapolating the old mode's position, causing the position not to
advance smoothly.

This should be a no-op when not using AudioTrack playback params for
speed adjustment.

Issue: #7982
PiperOrigin-RevId: 334151163

RELEASENOTES.md

@@ -14,6 +14,10 @@
 *   UI:
     *   Do not require subtitleButton in custom layouts of StyledPlayerView
         ([#7962](https://github.com/google/ExoPlayer/issues/7962)).
+*   Audio:
+    *   Fix the default audio sink position not advancing correctly when using
+        `AudioTrack`-based speed adjustment
+        ([#7982](https://github.com/google/ExoPlayer/issues/7982)).
 *   Extractors:
     *   Add support for .mp2 boxes in the `AtomParsers`
         ([#7967](https://github.com/google/ExoPlayer/issues/7967)).

library/core/src/main/java/com/google/android/exoplayer2/audio/AudioTrackPositionTracker.java

@@ -289,7 +289,10 @@ public long getCurrentPositionUs(boolean sourceEnded) {
     if (elapsedSincePreviousModeUs < MODE_SWITCH_SMOOTHING_DURATION_US) {
       // Use a ramp to smooth between the old mode and the new one to avoid introducing a sudden
       // jump if the two modes disagree.
-      long previousModeProjectedPositionUs = previousModePositionUs + elapsedSincePreviousModeUs;
+      long previousModeProjectedPositionUs =
+          previousModePositionUs
+              + Util.getMediaDurationForPlayoutDuration(
+                  elapsedSincePreviousModeUs, audioTrackPlaybackSpeed);
       // A ramp consisting of 1000 points distributed over MODE_SWITCH_SMOOTHING_DURATION_US.
       long rampPoint = (elapsedSincePreviousModeUs * 1000) / MODE_SWITCH_SMOOTHING_DURATION_US;
       positionUs *= rampPoint;