Skip non-continuous FrameInfos when finding the next frame to return from FrameBuffer::NextFrame.

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 245 matching lines @@
     CheckFrame(i + 1, pid + i + 1, 0);
   }
 }
 #endif  // Timing dependent tests.
 
 TEST_F(TestFrameBuffer2, ExtractFromEmptyBuffer) {
   ExtractFrame();
   CheckNoFrame(0);
 }
 
+TEST_F(TestFrameBuffer2, MissingFrame) {
+  uint16_t pid = Rand();
+  uint32_t ts = Rand();
+
+  InsertFrame(pid, 0, ts, false);
+  InsertFrame(pid + 2, 0, ts, false, pid);
+  InsertFrame(pid + 3, 0, ts, false, pid + 1, pid + 2);
+  ExtractFrame();
+  ExtractFrame();
+  ExtractFrame();
+
+  CheckFrame(0, pid, 0);
+  CheckFrame(1, pid + 2, 0);
+  CheckNoFrame(2);
+}
+
 TEST_F(TestFrameBuffer2, OneLayerStream) {
   uint16_t pid = Rand();
   uint32_t ts = Rand();
 
   InsertFrame(pid, 0, ts, false);
   ExtractFrame();
   CheckFrame(0, pid, 0);
   for (int i = 1; i < 10; ++i) {
     InsertFrame(pid + i, 0, ts + i * kFps10, false, pid + i - 1);
     ExtractFrame();
@@ skipping 122 matching lines @@
   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