Mark dropped buffers while joining as skipped.

These buffers are intentionally dropped to catch up with the playing audio.
Mark them as skipped accordingly.

PiperOrigin-RevId: 268703410

library/core/src/main/java/com/google/android/exoplayer2/video/MediaCodecVideoRenderer.java

@@ -836,11 +836,17 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
         bufferPresentationTimeUs, unadjustedFrameReleaseTimeNs);
     earlyUs = (adjustedReleaseTimeNs - systemTimeNs) / 1000;
 
+    boolean treatDroppedBuffersAsSkipped = joiningDeadlineMs != C.TIME_UNSET;
     if (shouldDropBuffersToKeyframe(earlyUs, elapsedRealtimeUs, isLastBuffer)
-        && maybeDropBuffersToKeyframe(codec, bufferIndex, presentationTimeUs, positionUs)) {
+        && maybeDropBuffersToKeyframe(
+            codec, bufferIndex, presentationTimeUs, positionUs, treatDroppedBuffersAsSkipped)) {
       return false;
     } else if (shouldDropOutputBuffer(earlyUs, elapsedRealtimeUs, isLastBuffer)) {
-      dropOutputBuffer(codec, bufferIndex, presentationTimeUs);
+      if (treatDroppedBuffersAsSkipped) {
+        skipOutputBuffer(codec, bufferIndex, presentationTimeUs);
+      } else {
+        dropOutputBuffer(codec, bufferIndex, presentationTimeUs);
+      }
       return true;
     }
 
@@ -1033,11 +1039,18 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
    * @param index The index of the output buffer to drop.
    * @param presentationTimeUs The presentation time of the output buffer, in microseconds.
    * @param positionUs The current playback position, in microseconds.
+   * @param treatDroppedBuffersAsSkipped Whether dropped buffers should be treated as intentionally
+   *     skipped.
    * @return Whether any buffers were dropped.
    * @throws ExoPlaybackException If an error occurs flushing the codec.
    */
-  protected boolean maybeDropBuffersToKeyframe(MediaCodec codec, int index, long presentationTimeUs,
-      long positionUs) throws ExoPlaybackException {
+  protected boolean maybeDropBuffersToKeyframe(
+      MediaCodec codec,
+      int index,
+      long presentationTimeUs,
+      long positionUs,
+      boolean treatDroppedBuffersAsSkipped)
+      throws ExoPlaybackException {
     int droppedSourceBufferCount = skipSource(positionUs);
     if (droppedSourceBufferCount == 0) {
       return false;
@@ -1045,7 +1058,12 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
     decoderCounters.droppedToKeyframeCount++;
     // We dropped some buffers to catch up, so update the decoder counters and flush the codec,
     // which releases all pending buffers buffers including the current output buffer.
-    updateDroppedBufferCounters(buffersInCodecCount + droppedSourceBufferCount);
+    int totalDroppedBufferCount = buffersInCodecCount + droppedSourceBufferCount;
+    if (treatDroppedBuffersAsSkipped) {
+      decoderCounters.skippedOutputBufferCount += totalDroppedBufferCount;
+    } else {
+      updateDroppedBufferCounters(totalDroppedBufferCount);
+    }
     flushOrReinitializeCodec();
     return true;
   }