check maximum consecutively dropped frames in video tests

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

@@ -31,6 +31,7 @@ public final class CodecCounters {
   public int renderedOutputBufferCount;
   public int skippedOutputBufferCount;
   public int droppedOutputBufferCount;
+  public int maxConsecutiveDroppedOutputBufferCount;
 
   /**
    * Should be invoked from the playback thread after the counters have been updated. Should also
@@ -52,6 +53,7 @@ public final class CodecCounters {
     builder.append(" ren:").append(renderedOutputBufferCount);
     builder.append(" sob:").append(skippedOutputBufferCount);
     builder.append(" dob:").append(droppedOutputBufferCount);
+    builder.append(" mcdob:").append(maxConsecutiveDroppedOutputBufferCount);
     return builder.toString();
   }
 

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

@@ -112,6 +112,7 @@ public class MediaCodecVideoTrackRenderer extends MediaCodecTrackRenderer {
   private long joiningDeadlineUs;
   private long droppedFrameAccumulationStartTimeMs;
   private int droppedFrameCount;
+  private int consecutiveDroppedFrameCount;
 
   private int pendingRotationDegrees;
   private float pendingPixelWidthHeightRatio;
@@ -220,6 +221,7 @@ public class MediaCodecVideoTrackRenderer extends MediaCodecTrackRenderer {
       throws ExoPlaybackException {
     super.onEnabled(track, positionUs, joining);
     renderedFirstFrame = false;
+    consecutiveDroppedFrameCount = 0;
     if (joining && allowedJoiningTimeUs > 0) {
       joiningDeadlineUs = SystemClock.elapsedRealtime() * 1000L + allowedJoiningTimeUs;
     }
@@ -230,6 +232,7 @@ public class MediaCodecVideoTrackRenderer extends MediaCodecTrackRenderer {
   protected void seekTo(long positionUs) throws ExoPlaybackException {
     super.seekTo(positionUs);
     renderedFirstFrame = false;
+    consecutiveDroppedFrameCount = 0;
     joiningDeadlineUs = -1;
   }
 
@@ -377,6 +380,7 @@ public class MediaCodecVideoTrackRenderer extends MediaCodecTrackRenderer {
       ByteBuffer buffer, MediaCodec.BufferInfo bufferInfo, int bufferIndex, boolean shouldSkip) {
     if (shouldSkip) {
       skipOutputBuffer(codec, bufferIndex);
+      consecutiveDroppedFrameCount = 0;
       return true;
     }
 
@@ -386,6 +390,7 @@ public class MediaCodecVideoTrackRenderer extends MediaCodecTrackRenderer {
       } else {
         renderOutputBuffer(codec, bufferIndex);
       }
+      consecutiveDroppedFrameCount = 0;
       return true;
     }
 
@@ -416,6 +421,7 @@ public class MediaCodecVideoTrackRenderer extends MediaCodecTrackRenderer {
       // Let the underlying framework time the release.
       if (earlyUs < 50000) {
         renderOutputBufferV21(codec, bufferIndex, adjustedReleaseTimeNs);
+        consecutiveDroppedFrameCount = 0;
         return true;
       }
     } else {
@@ -432,6 +438,7 @@ public class MediaCodecVideoTrackRenderer extends MediaCodecTrackRenderer {
           }
         }
         renderOutputBuffer(codec, bufferIndex);
+        consecutiveDroppedFrameCount = 0;
         return true;
       }
     }
@@ -453,6 +460,9 @@ public class MediaCodecVideoTrackRenderer extends MediaCodecTrackRenderer {
     TraceUtil.endSection();
     codecCounters.droppedOutputBufferCount++;
     droppedFrameCount++;
+    consecutiveDroppedFrameCount++;
+    codecCounters.maxConsecutiveDroppedOutputBufferCount = Math.max(consecutiveDroppedFrameCount,
+        codecCounters.maxConsecutiveDroppedOutputBufferCount);
     if (droppedFrameCount == maxDroppedFrameCountToNotify) {
       maybeNotifyDroppedFrameCount();
     }

playbacktests/src/main/java/com/google/android/exoplayer/playbacktests/gts/DashTest.java

@@ -65,6 +65,7 @@ public final class DashTest extends ActivityInstrumentationTestCase2<HostActivit
 
   private static final long MAX_PLAYING_TIME_DISCREPANCY_MS = 2000;
   private static final float MAX_DROPPED_VIDEO_FRAME_FRACTION = 0.01f;
+  private static final int MAX_CONSECUTIVE_DROPPED_VIDEO_FRAMES = 10;
 
   private static final long MAX_ADDITIONAL_TIME_MS = 180000;
   private static final int MIN_LOADABLE_RETRY_COUNT = 10;
@@ -383,9 +384,13 @@ public final class DashTest extends ActivityInstrumentationTestCase2<HostActivit
       }
 
       // Assert that the level of performance was acceptable.
+      // Assert that total dropped frames were within limit.
       int droppedFrameLimit = (int) Math.ceil(MAX_DROPPED_VIDEO_FRAME_FRACTION
           * CodecCountersUtil.getTotalOutputBuffers(videoCounters));
       CodecCountersUtil.assertDroppedOutputBufferLimit(VIDEO_TAG, videoCounters, droppedFrameLimit);
+      // Assert that consecutive dropped frames were within limit.
+      CodecCountersUtil.assertConsecutiveDroppedOutputBufferLimit(VIDEO_TAG, videoCounters,
+          MAX_CONSECUTIVE_DROPPED_VIDEO_FRAMES);
     }
 
     private static final class TrackSelector implements DashTrackSelector {

playbacktests/src/main/java/com/google/android/exoplayer/playbacktests/util/CodecCountersUtil.java

@@ -77,4 +77,12 @@ public final class CodecCountersUtil {
         + "Limit: " + limit + ".", actual <= limit);
   }
 
+  public static void assertConsecutiveDroppedOutputBufferLimit(String name, CodecCounters counters,
+      int limit) {
+    counters.ensureUpdated();
+    int actual = counters.maxConsecutiveDroppedOutputBufferCount;
+    TestCase.assertTrue("Codec(" + name + ") was late decoding: " + actual
+        + " buffers consecutively. " + "Limit: " + limit + ".", actual <= limit);
+  }
+
 }