Frame continuity is now tested as soon as a frame is inserted into the FrameBuffer.

webrtc/modules/video_coding/frame_buffer2_unittest.cc

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 93 matching lines @@
 
   void SetUp() override { extract_thread_.Start(); }
 
   void TearDown() override {
     tear_down_ = true;
     trigger_extract_event_.Set();
     extract_thread_.Stop();
   }
 
   template <typename... T>
-  void InsertFrame(uint16_t picture_id,
-                   uint8_t spatial_layer,
-                   int64_t ts_ms,
-                   bool inter_layer_predicted,
-                   T... refs) {
+  int InsertFrame(uint16_t picture_id,
+                  uint8_t spatial_layer,
+                  int64_t ts_ms,
+                  bool inter_layer_predicted,
+                  T... refs) {
     static_assert(sizeof...(refs) <= kMaxReferences,
                   "To many references specified for FrameObject.");
     std::array<uint16_t, sizeof...(refs)> references = {{refs...}};
 
     std::unique_ptr<FrameObjectFake> frame(new FrameObjectFake());
     frame->picture_id = picture_id;
     frame->spatial_layer = spatial_layer;
     frame->timestamp = ts_ms * 90;
     frame->num_references = references.size();
     frame->inter_layer_predicted = inter_layer_predicted;
     for (size_t r = 0; r < references.size(); ++r)
       frame->references[r] = references[r];
 
-    buffer_.InsertFrame(std::move(frame));
+    return buffer_.InsertFrame(std::move(frame));
   }
 
   void ExtractFrame(int64_t max_wait_time = 0) {
     crit_.Enter();
     if (max_wait_time == 0) {
       std::unique_ptr<FrameObject> frame;
       FrameBuffer::ReturnReason res = buffer_.NextFrame(0, &frame);
       if (res != FrameBuffer::ReturnReason::kStopped)
         frames_.emplace_back(std::move(frame));
       crit_.Leave();
@@ skipping 208 matching lines @@
   EXPECT_CALL(jitter_estimator_, GetJitterEstimate(1.0));
   InsertFrame(pid, 0, ts, false);
   ExtractFrame();
 
   buffer_.SetProtectionMode(kProtectionNackFEC);
   EXPECT_CALL(jitter_estimator_, GetJitterEstimate(0.0));
   InsertFrame(pid + 1, 0, ts, false);
   ExtractFrame();
 }
 
+TEST_F(TestFrameBuffer2, NoContinuousFrame) {
+  uint16_t pid = Rand();
+  uint32_t ts = Rand();
+
+  EXPECT_EQ(-1, InsertFrame(pid + 1, 0, ts, false, pid));
+}
+
+TEST_F(TestFrameBuffer2, LastContinuousFrameSingleLayer) {
+  uint16_t pid = Rand();
+  uint32_t ts = Rand();
+
+  EXPECT_EQ(pid, InsertFrame(pid, 0, ts, false));
+  EXPECT_EQ(pid, InsertFrame(pid + 2, 0, ts, false, pid + 1));
+  EXPECT_EQ(pid + 2, InsertFrame(pid + 1, 0, ts, false, pid));
+  EXPECT_EQ(pid + 2, InsertFrame(pid + 4, 0, ts, false, pid + 3));
+  EXPECT_EQ(pid + 5, InsertFrame(pid + 5, 0, ts, false));
+}
+
+TEST_F(TestFrameBuffer2, LastContinuousFrameTwoLayers) {
+  uint16_t pid = Rand();
+  uint32_t ts = Rand();
+
+  EXPECT_EQ(pid, InsertFrame(pid, 0, ts, false));
+  EXPECT_EQ(pid, InsertFrame(pid, 1, ts, true));
+  EXPECT_EQ(pid, InsertFrame(pid + 1, 1, ts, true, pid));
+  EXPECT_EQ(pid, InsertFrame(pid + 2, 0, ts, false, pid + 1));
+  EXPECT_EQ(pid, InsertFrame(pid + 2, 1, ts, true, pid + 1));
+  EXPECT_EQ(pid, InsertFrame(pid + 3, 0, ts, false, pid + 2));
+  EXPECT_EQ(pid + 3, InsertFrame(pid + 1, 0, ts, false, pid));
+  EXPECT_EQ(pid + 3, InsertFrame(pid + 3, 1, ts, true, pid + 2));
+}
+
 }  // namespace video_coding
 }  // namespace webrtc