modules/video_coding refactorings

The main purpose was the interface-> include rename, but other files
were also moved, eliminating the "main" dir.

To avoid breaking downstream, the "interface" directories were copied
into a new "video_coding/include" dir. The old headers got pragma
warnings added about deprecation (a very short deprecation since I plan
to remove them as soon downstream is updated).

Other files also moved:
video_coding/main/source -> video_coding
video_coding/main/test -> video_coding/test

BUG=webrtc:5095
TESTED=Passing compile-trybots with --clobber flag:
git cl try --clobber --bot=win_compile_rel --bot=linux_compile_rel --bot=android_compile_rel --bot=mac_compile_rel --bot=ios_rel --bot=linux_gn_rel --bot=win_x64_gn_rel --bot=mac_x64_gn_rel --bot=android_gn_rel -m tryserver.webrtc

R=stefan@webrtc.org, tommi@webrtc.org

Review URL: https://codereview.webrtc.org/1417283007 .

Cr-Commit-Position: refs/heads/master@{#10694}

webrtc/modules/video_coding/frame_buffer.h

@@ -0,0 +1,92 @@
+/*
+ *  Copyright (c) 2012 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_BUFFER_H_
+#define WEBRTC_MODULES_VIDEO_CODING_FRAME_BUFFER_H_
+
+#include "webrtc/modules/include/module_common_types.h"
+#include "webrtc/modules/video_coding/include/video_coding.h"
+#include "webrtc/modules/video_coding/encoded_frame.h"
+#include "webrtc/modules/video_coding/jitter_buffer_common.h"
+#include "webrtc/modules/video_coding/session_info.h"
+#include "webrtc/typedefs.h"
+
+namespace webrtc {
+
+class VCMFrameBuffer : public VCMEncodedFrame {
+ public:
+  VCMFrameBuffer();
+  virtual ~VCMFrameBuffer();
+
+  VCMFrameBuffer(const VCMFrameBuffer& rhs);
+
+  virtual void Reset();
+
+  VCMFrameBufferEnum InsertPacket(const VCMPacket& packet,
+                                  int64_t timeInMs,
+                                  VCMDecodeErrorMode decode_error_mode,
+                                  const FrameData& frame_data);
+
+  // State
+  // Get current state of frame
+  VCMFrameBufferStateEnum GetState() const;
+  // Get current state and timestamp of frame
+  VCMFrameBufferStateEnum GetState(uint32_t& timeStamp) const;
+  void PrepareForDecode(bool continuous);
+
+  bool IsRetransmitted() const;
+  bool IsSessionComplete() const;
+  bool HaveFirstPacket() const;
+  bool HaveLastPacket() const;
+  int NumPackets() const;
+  // Makes sure the session contain a decodable stream.
+  void MakeSessionDecodable();
+
+  // Sequence numbers
+  // Get lowest packet sequence number in frame
+  int32_t GetLowSeqNum() const;
+  // Get highest packet sequence number in frame
+  int32_t GetHighSeqNum() const;
+
+  int PictureId() const;
+  int TemporalId() const;
+  bool LayerSync() const;
+  int Tl0PicId() const;
+  bool NonReference() const;
+
+  void SetGofInfo(const GofInfoVP9& gof_info, size_t idx);
+
+  // Increments a counter to keep track of the number of packets of this frame
+  // which were NACKed before they arrived.
+  void IncrementNackCount();
+  // Returns the number of packets of this frame which were NACKed before they
+  // arrived.
+  int16_t GetNackCount() const;
+
+  int64_t LatestPacketTimeMs() const;
+
+  webrtc::FrameType FrameType() const;
+  void SetPreviousFrameLoss();
+
+  // The number of packets discarded because the decoder can't make use of them.
+  int NotDecodablePackets() const;
+
+ private:
+  void SetState(VCMFrameBufferStateEnum state);  // Set state of frame
+
+  VCMFrameBufferStateEnum _state;  // Current state of the frame
+  VCMSessionInfo _sessionInfo;
+  uint16_t _nackCount;
+  int64_t _latestPacketTimeMs;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_VIDEO_CODING_FRAME_BUFFER_H_