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#pragma once

#include "CommonDef.h"

namespace vvdec

{

/**

 * Represents a single NALunit header and the associated RBSPayload

 */

struct NALUnit

{

  NalUnitType m_nalUnitType = NAL_UNIT_INVALID;   ///< nal_unit_type

  uint32_t    m_temporalId  = 0;                  ///< temporal_id

  uint32_t    m_nuhLayerId  = 0;                  ///< nuh_layer_id

  uint32_t    m_forbiddenZeroBit   = 0;

  uint32_t    m_nuhReservedZeroBit = 0;

  uint64_t    m_bits     = 0;            ///< original nal unit bits

  uint64_t    m_cts      = 0;            ///< composition time stamp in TicksPerSecond

  uint64_t    m_dts      = 0;            ///< decoding time stamp in TicksPerSecond

  bool        m_rap      = false;        ///< random access point flag

  void       *m_userData = nullptr;      ///< opaque user data

  NALUnit(const NALUnit &src)

    : m_nalUnitType (src.m_nalUnitType)

    , m_temporalId  (src.m_temporalId)

    , m_nuhLayerId  (src.m_nuhLayerId)

    , m_forbiddenZeroBit  (src.m_forbiddenZeroBit)

    , m_nuhReservedZeroBit(src.m_nuhReservedZeroBit)

  {}

  /** construct an NALunit structure with given header values. */

  NALUnit( NalUnitType nalUnitType,

           int         temporalId = 0 ,

           int         nuhLayerId = 0 )

    : m_nalUnitType (nalUnitType)

    , m_temporalId  (temporalId)

    , m_nuhLayerId  (nuhLayerId)

  {}

  /** default constructor - no initialization; must be performed by user */

  NALUnit() {}

  virtual ~NALUnit() { }

  /** returns true if the NALunit is a slice NALunit */

  bool isSlice()

  {

    return m_nalUnitType == NAL_UNIT_CODED_SLICE_TRAIL

        || m_nalUnitType == NAL_UNIT_CODED_SLICE_STSA

        || m_nalUnitType == NAL_UNIT_CODED_SLICE_RADL

        || m_nalUnitType == NAL_UNIT_CODED_SLICE_RASL

        || m_nalUnitType == NAL_UNIT_CODED_SLICE_IDR_W_RADL

        || m_nalUnitType == NAL_UNIT_CODED_SLICE_IDR_N_LP

        || m_nalUnitType == NAL_UNIT_CODED_SLICE_CRA

        || m_nalUnitType == NAL_UNIT_CODED_SLICE_GDR

        ;

  }

  bool isSei()

  {

    return m_nalUnitType == NAL_UNIT_PREFIX_SEI

        || m_nalUnitType == NAL_UNIT_SUFFIX_SEI;

  }

  bool isVcl()

  {

    return isVclNalUnitType(m_nalUnitType);

  }

  static bool isVclNalUnitType(NalUnitType t)

  {

    return t <= NAL_UNIT_RESERVED_IRAP_VCL_11;

  }

};

}