Fix pending stream offset activation in video renderer.

Currently, pending stream offset changes are kept until an output buffer
timestamp surpasses the next pending stream offset. However, this is
problematic if the next stream offset overlaps with the current output
buffer sample times (e.g. because the next stream starts at a non-zero start
time).

To correctly time the switch to the next stream offset, this change keeps
the timestamp of the last queued input sample as switch point. And we only
switch to the new offset after an output sample timestamp reached this switch
point.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=192736637

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

@@ -91,6 +91,7 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
   private final int maxDroppedFramesToNotify;
   private final boolean deviceNeedsAutoFrcWorkaround;
   private final long[] pendingOutputStreamOffsetsUs;
+  private final long[] pendingOutputStreamSwitchTimesUs;
 
   private CodecMaxValues codecMaxValues;
   private boolean codecNeedsSetOutputSurfaceWorkaround;
@@ -123,6 +124,7 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
   private int tunnelingAudioSessionId;
   /* package */ OnFrameRenderedListenerV23 tunnelingOnFrameRenderedListener;
 
+  private long lastInputTimeUs;
   private long outputStreamOffsetUs;
   private int pendingOutputStreamOffsetCount;
 
@@ -194,7 +196,9 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
     eventDispatcher = new EventDispatcher(eventHandler, eventListener);
     deviceNeedsAutoFrcWorkaround = deviceNeedsAutoFrcWorkaround();
     pendingOutputStreamOffsetsUs = new long[MAX_PENDING_OUTPUT_STREAM_OFFSET_COUNT];
+    pendingOutputStreamSwitchTimesUs = new long[MAX_PENDING_OUTPUT_STREAM_OFFSET_COUNT];
     outputStreamOffsetUs = C.TIME_UNSET;
+    lastInputTimeUs = C.TIME_UNSET;
     joiningDeadlineMs = C.TIME_UNSET;
     currentWidth = Format.NO_VALUE;
     currentHeight = Format.NO_VALUE;
@@ -269,6 +273,7 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
         pendingOutputStreamOffsetCount++;
       }
       pendingOutputStreamOffsetsUs[pendingOutputStreamOffsetCount - 1] = offsetUs;
+      pendingOutputStreamSwitchTimesUs[pendingOutputStreamOffsetCount - 1] = lastInputTimeUs;
     }
     super.onStreamChanged(formats, offsetUs);
   }
@@ -279,6 +284,7 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
     clearRenderedFirstFrame();
     initialPositionUs = C.TIME_UNSET;
     consecutiveDroppedFrameCount = 0;
+    lastInputTimeUs = C.TIME_UNSET;
     if (pendingOutputStreamOffsetCount != 0) {
       outputStreamOffsetUs = pendingOutputStreamOffsetsUs[pendingOutputStreamOffsetCount - 1];
       pendingOutputStreamOffsetCount = 0;
@@ -332,6 +338,7 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
     currentPixelWidthHeightRatio = Format.NO_VALUE;
     pendingPixelWidthHeightRatio = Format.NO_VALUE;
     outputStreamOffsetUs = C.TIME_UNSET;
+    lastInputTimeUs = C.TIME_UNSET;
     pendingOutputStreamOffsetCount = 0;
     clearReportedVideoSize();
     clearRenderedFirstFrame();
@@ -495,6 +502,7 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
   @Override
   protected void onQueueInputBuffer(DecoderInputBuffer buffer) {
     buffersInCodecCount++;
+    lastInputTimeUs = Math.max(buffer.timeUs, lastInputTimeUs);
     if (Util.SDK_INT < 23 && tunneling) {
       maybeNotifyRenderedFirstFrame();
     }
@@ -538,13 +546,6 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
       initialPositionUs = positionUs;
     }
 
-    while (pendingOutputStreamOffsetCount != 0
-        && bufferPresentationTimeUs >= pendingOutputStreamOffsetsUs[0]) {
-      outputStreamOffsetUs = pendingOutputStreamOffsetsUs[0];
-      pendingOutputStreamOffsetCount--;
-      System.arraycopy(pendingOutputStreamOffsetsUs, 1, pendingOutputStreamOffsetsUs, 0,
-          pendingOutputStreamOffsetCount);
-    }
     long presentationTimeUs = bufferPresentationTimeUs - outputStreamOffsetUs;
 
     if (shouldSkip) {
@@ -639,6 +640,23 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
   @Override
   protected void onProcessedOutputBuffer(long presentationTimeUs) {
     buffersInCodecCount--;
+    while (pendingOutputStreamOffsetCount != 0
+        && presentationTimeUs >= pendingOutputStreamSwitchTimesUs[0]) {
+      outputStreamOffsetUs = pendingOutputStreamOffsetsUs[0];
+      pendingOutputStreamOffsetCount--;
+      System.arraycopy(
+          pendingOutputStreamOffsetsUs,
+          /* srcPos= */ 1,
+          pendingOutputStreamOffsetsUs,
+          /* destPos= */ 0,
+          pendingOutputStreamOffsetCount);
+      System.arraycopy(
+          pendingOutputStreamSwitchTimesUs,
+          /* srcPos= */ 1,
+          pendingOutputStreamSwitchTimesUs,
+          /* destPos= */ 0,
+          pendingOutputStreamOffsetCount);
+    }
   }
 
   /**