Convert Vp9 Rtp headers to frame references.

webrtc/modules/video_coding/frame_object.h

 /*
  *  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.
  */
 
 #ifndef WEBRTC_MODULES_VIDEO_CODING_FRAME_OBJECT_H_
 #define WEBRTC_MODULES_VIDEO_CODING_FRAME_OBJECT_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <array>
 
 namespace webrtc {
 namespace video_coding {
 
 class FrameObject {
  public:
   static const uint8_t kMaxFrameReferences = 5;
 
+  FrameObject();
+
   virtual bool GetBitstream(uint8_t* destination) const = 0;
   virtual ~FrameObject() {}
 
+  // The tuple (|picture_id|, |spatial_layer|) uniquely identifies a frame
+  // object. For codec types that don't necessarily have picture ids they
+  // have to be constructed from the header data relevant to that codec.
   uint16_t picture_id;
+  uint8_t spatial_layer;
+
   size_t num_references;
-  std::array<uint16_t, kMaxFrameReferences> referencesr;
   uint16_t references[kMaxFrameReferences];
+  bool inter_layer_predicted;
 };
 
 class PacketBuffer;
 
 class RtpFrameObject : public FrameObject {
  public:
   RtpFrameObject(PacketBuffer* packet_buffer,
                  uint16_t first_packet,
                  uint16_t last_packet);
 
   ~RtpFrameObject();
   uint16_t first_seq_num() const;
   uint16_t last_seq_num() const;
   bool GetBitstream(uint8_t* destination) const override;
 
  private:
   PacketBuffer* packet_buffer_;
   uint16_t first_packet_;
   uint16_t last_packet_;
 };
 
 }  // namespace video_coding
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_CODING_FRAME_OBJECT_H_