Adding support for simulcast and spatial layers into VideoQualityTest

webrtc/test/layer_filtering_transport.h

 /*
  *  Copyright (c) 2015 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.
  */
 #ifndef WEBRTC_TEST_LAYER_FILTERING_TRANSPORT_H_
 #define WEBRTC_TEST_LAYER_FILTERING_TRANSPORT_H_
 
 #include "webrtc/test/direct_transport.h"
 #include "webrtc/test/fake_network_pipe.h"
 
 #include <map>
 
 namespace webrtc {
 
 namespace test {
 
 class LayerFilteringTransport : public test::DirectTransport {
  public:
   LayerFilteringTransport(const FakeNetworkPipe::Config& config,
                           uint8_t vp8_video_payload_type,
                           uint8_t vp9_video_payload_type,
-                          uint8_t tl_discard_threshold,
-                          uint8_t sl_discard_threshold);
+                          int selected_tl,
+                          int selected_sl);
+  bool DiscardedLastPacket() const;
   bool SendRtp(const uint8_t* data,
                size_t length,
                const PacketOptions& options) override;
 
  private:
   uint16_t NextSequenceNumber(uint32_t ssrc);
   // Used to distinguish between VP8 and VP9.
   const uint8_t vp8_video_payload_type_;
   const uint8_t vp9_video_payload_type_;
-  // Discard all temporal/spatial layers with id greater or equal the
-  // threshold. 0 to disable.
-  const uint8_t tl_discard_threshold_;
-  const uint8_t sl_discard_threshold_;
+  // Discard or invalidate all temporal/spatial layers with id greater than the
+  // selected one. -1 to disable filtering.
+  const int selected_tl_;
+  const int selected_sl_;
   // Current sequence number for each SSRC separately.
   std::map<uint32_t, uint16_t> current_seq_nums_;
+  bool discarded_last_packet_;
 };
 
 }  // namespace test
 }  // namespace webrtc
 
 #endif  // WEBRTC_TEST_LAYER_FILTERING_TRANSPORT_H_