modules/video_coding refactorings

webrtc/modules/video_coding/main/source/decoding_state.h

-/*
- *  Copyright (c) 2011 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_DECODING_STATE_H_
-#define WEBRTC_MODULES_VIDEO_CODING_DECODING_STATE_H_
-
-#include "webrtc/typedefs.h"
-
-namespace webrtc {
-
-// Forward declarations
-class VCMFrameBuffer;
-class VCMPacket;
-
-class VCMDecodingState {
- public:
-  // The max number of bits used to reference back
-  // to a previous frame when using flexible mode.
-  static const uint16_t kNumRefBits = 7;
-  static const uint16_t kFrameDecodedLength = 1 << kNumRefBits;
-
-  VCMDecodingState();
-  ~VCMDecodingState();
-  // Check for old frame
-  bool IsOldFrame(const VCMFrameBuffer* frame) const;
-  // Check for old packet
-  bool IsOldPacket(const VCMPacket* packet) const;
-  // Check for frame continuity based on current decoded state. Use best method
-  // possible, i.e. temporal info, picture ID or sequence number.
-  bool ContinuousFrame(const VCMFrameBuffer* frame) const;
-  void SetState(const VCMFrameBuffer* frame);
-  void CopyFrom(const VCMDecodingState& state);
-  bool UpdateEmptyFrame(const VCMFrameBuffer* frame);
-  // Update the sequence number if the timestamp matches current state and the
-  // sequence number is higher than the current one. This accounts for packets
-  // arriving late.
-  void UpdateOldPacket(const VCMPacket* packet);
-  void SetSeqNum(uint16_t new_seq_num);
-  void Reset();
-  uint32_t time_stamp() const;
-  uint16_t sequence_num() const;
-  // Return true if at initial state.
-  bool in_initial_state() const;
-  // Return true when sync is on - decode all layers.
-  bool full_sync() const;
-
- private:
-  void UpdateSyncState(const VCMFrameBuffer* frame);
-  // Designated continuity functions
-  bool ContinuousPictureId(int picture_id) const;
-  bool ContinuousSeqNum(uint16_t seq_num) const;
-  bool ContinuousLayer(int temporal_id, int tl0_pic_id) const;
-  bool ContinuousFrameRefs(const VCMFrameBuffer* frame) const;
-  bool UsingPictureId(const VCMFrameBuffer* frame) const;
-  bool UsingFlexibleMode(const VCMFrameBuffer* frame) const;
-  bool AheadOfFramesDecodedClearedTo(uint16_t index) const;
-
-  // Keep state of last decoded frame.
-  // TODO(mikhal/stefan): create designated classes to handle these types.
-  uint16_t    sequence_num_;
-  uint32_t    time_stamp_;
-  int         picture_id_;
-  int         temporal_id_;
-  int         tl0_pic_id_;
-  bool        full_sync_;  // Sync flag when temporal layers are used.
-  bool        in_initial_state_;
-
-  // Used to check references in flexible mode.
-  bool frame_decoded_[kFrameDecodedLength];
-  uint16_t frame_decoded_cleared_to_;
-};
-
-}  // namespace webrtc
-
-#endif  // WEBRTC_MODULES_VIDEO_CODING_DECODING_STATE_H_