decoding_state.h - mozsearch

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/*

 *  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 MODULES_VIDEO_CODING_DEPRECATED_DECODING_STATE_H_

#define MODULES_VIDEO_CODING_DEPRECATED_DECODING_STATE_H_

#include <cstdint>

#include <map>

#include <set>

#include <vector>

namespace webrtc {

// Forward declarations

struct NaluInfo;

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;

  bool HaveSpsAndPps(const std::vector<NaluInfo>& nalus) 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_;

  std::set<int> received_sps_;

  std::map<int, int> received_pps_;

};

}  // namespace webrtc

#endif  // MODULES_VIDEO_CODING_DEPRECATED_DECODING_STATE_H_