Logic for finding frame references moved from PacketBuffer to new class

webrtc/modules/video_coding/packet_buffer_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.
  */
 
 #include <cstring>
 #include <limits>
-#include <memory>
+#include <map>
+#include <set>
 #include <utility>
 
 #include "webrtc/modules/video_coding/frame_object.h"
 #include "webrtc/modules/video_coding/packet_buffer.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "webrtc/base/random.h"
 
 namespace webrtc {
 namespace video_coding {
@@ skipping 413 matching lines @@
 
   frames_from_callback_.clear();
 
   //            seq_num    , kf, frst, lst
   InsertGeneric(seq_num    , kT, kT  , kF);
   InsertGeneric(seq_num + 1, kF, kF  , kF);
   InsertGeneric(seq_num + 2, kF, kF  , kT);
   EXPECT_EQ(1UL, frames_from_callback_.size());
 }
 
-TEST_F(TestPacketBuffer, Flush) {
+TEST_F(TestPacketBuffer, Clear) {
   uint16_t seq_num = Rand();
 
   //            seq_num    , kf, frst, lst
   InsertGeneric(seq_num    , kT, kT  , kF);
   InsertGeneric(seq_num + 1, kF, kF  , kF);
   InsertGeneric(seq_num + 2, kF, kF  , kT);
   EXPECT_EQ(1UL, frames_from_callback_.size());
 
-  packet_buffer_->Flush();
+  packet_buffer_->Clear();
 
   //            seq_num                 , kf, frst, lst
   InsertGeneric(seq_num + kStartSize    , kT, kT  , kF);
   InsertGeneric(seq_num + kStartSize + 1, kF, kF  , kF);
   InsertGeneric(seq_num + kStartSize + 2, kF, kF  , kT);
   EXPECT_EQ(2UL, frames_from_callback_.size());
 }
 
-TEST_F(TestPacketBuffer, InvalidateFrameByFlushing) {
+TEST_F(TestPacketBuffer, InvalidateFrameByClearing) {
   VCMPacket packet;
   packet.codec = kVideoCodecGeneric;
   packet.frameType = kVideoFrameKey;
   packet.isFirstPacket = kT;
   packet.markerBit = kT;
   packet.seqNum = Rand();
   EXPECT_TRUE(packet_buffer_->InsertPacket(packet));
   ASSERT_EQ(1UL, frames_from_callback_.size());
 
-  packet_buffer_->Flush();
+  packet_buffer_->Clear();
   EXPECT_FALSE(frames_from_callback_.begin()->second->GetBitstream(nullptr));
 }
 
 TEST_F(TestPacketBuffer, Vp8NoPictureId) {
   uint16_t seq_num = Rand();
 
   //        seq_num     , kf, frst, lst
   InsertVp8(seq_num     , kT, kT  , kF);
   InsertVp8(seq_num + 1 , kF, kF  , kF);
   InsertVp8(seq_num + 2 , kF, kF  , kT);
@@ skipping 911 matching lines @@
   CheckReferencesVp9(pid + 5, 1, pid + 4);
   CheckReferencesVp9(pid + 6, 0, pid + 4);
   CheckReferencesVp9(pid + 6, 1, pid + 5);
   CheckReferencesVp9(pid + 7, 1, pid + 6);
   CheckReferencesVp9(pid + 8, 0, pid + 6);
   CheckReferencesVp9(pid + 8, 1, pid + 7);
 }
 
 }  // namespace video_coding
 }  // namespace webrtc