/* -----------------------------------------------------------------------------
The copyright in this software is being made available under the Clear BSD
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other Intellectual Property Rights other than the copyrights concerning 
the Software are granted under this license.

The Clear BSD License

Copyright (c) 2019-2024, Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. & The VVenC Authors.
All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted (subject to the limitations in the disclaimer below) provided that
the following conditions are met:

     * Redistributions of source code must retain the above copyright notice,
     this list of conditions and the following disclaimer.

     * Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in the
     documentation and/or other materials provided with the distribution.

     * Neither the name of the copyright holder nor the names of its
     contributors may be used to endorse or promote products derived from this
     software without specific prior written permission.

NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED BY
THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.


------------------------------------------------------------------------------------------- */
#pragma once

#include <sstream>
#include <list>
#include "vvenc/vvenc.h"

//! \ingroup Interface
//! \{

namespace vvenc {

/**
 * Represents a single NALunit header and the associated RBSPayload
 */
struct NALUnit
{
  vvencNalUnitType m_nalUnitType; ///< nal_unit_type
  uint32_t    m_temporalId;  ///< temporal_id
  uint32_t    m_nuhLayerId;  ///< nuh_layer_id
  uint32_t    m_forbiddenZeroBit;
  uint32_t    m_nuhReservedZeroBit;

  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(
    vvencNalUnitType nalUnitType,
    uint32_t temporalId = 0,
    uint32_t nuhReservedZeroBit = 0,
    uint32_t forbiddenZeroBit = 0,
    uint32_t nuhLayerId = 0)
    : m_nalUnitType (nalUnitType)
    , m_temporalId  (temporalId)
    , m_nuhLayerId  (nuhLayerId)
    , m_forbiddenZeroBit(forbiddenZeroBit)
    , m_nuhReservedZeroBit(nuhReservedZeroBit)
  {}

  /** 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 == VVENC_NAL_UNIT_CODED_SLICE_TRAIL
        || m_nalUnitType == VVENC_NAL_UNIT_CODED_SLICE_STSA
        || m_nalUnitType == VVENC_NAL_UNIT_CODED_SLICE_IDR_W_RADL
        || m_nalUnitType == VVENC_NAL_UNIT_CODED_SLICE_IDR_N_LP
        || m_nalUnitType == VVENC_NAL_UNIT_CODED_SLICE_CRA
        || m_nalUnitType == VVENC_NAL_UNIT_CODED_SLICE_GDR
        || m_nalUnitType == VVENC_NAL_UNIT_CODED_SLICE_RADL
        || m_nalUnitType == VVENC_NAL_UNIT_CODED_SLICE_RASL;
  }
  bool isSei()
  {
    return m_nalUnitType == VVENC_NAL_UNIT_PREFIX_SEI
        || m_nalUnitType == VVENC_NAL_UNIT_SUFFIX_SEI;
  }

  bool isVcl()
  {
    return m_nalUnitType == VVENC_NAL_UNIT_CODED_SLICE_TRAIL
        || m_nalUnitType == VVENC_NAL_UNIT_CODED_SLICE_STSA
        || m_nalUnitType == VVENC_NAL_UNIT_CODED_SLICE_RADL
        || m_nalUnitType == VVENC_NAL_UNIT_CODED_SLICE_RASL
        || m_nalUnitType == VVENC_NAL_UNIT_CODED_SLICE_IDR_W_RADL
        || m_nalUnitType == VVENC_NAL_UNIT_CODED_SLICE_IDR_N_LP
        || m_nalUnitType == VVENC_NAL_UNIT_CODED_SLICE_CRA
        || m_nalUnitType == VVENC_NAL_UNIT_CODED_SLICE_GDR;

  }
};

struct OutputNALUnit;

/**
 * A single NALunit, with complete payload in EBSP format.
 */
struct NALUnitEBSP : public NALUnit
{
  std::ostringstream m_nalUnitData;

  /**
   * convert the OutputNALUnit nalu into EBSP format by writing out
   * the NALUnit header, then the rbsp_bytes including any
   * emulation_prevention_three_byte symbols.
   */
  NALUnitEBSP(OutputNALUnit& nalu);
};
//! \}
//! \}


/**
 * An AccessUnit is a list of one or more NAL units, according to the
 * working draft.  All NAL units within the object belong to the same
 * access unit.
 *
 * NALUnits held in the AccessUnit list are in EBSP format.  Attempting
 * to insert an OutputNALUnit into the access unit will automatically cause
 * the nalunit to have its headers written and anti-emulation performed.
 *
 * The AccessUnit owns all pointers stored within.  Destroying the
 * AccessUnit will delete all contained objects.
 */
class AccessUnitList : public std::list<NALUnitEBSP*> // NOTE: Should not inherit from STL.
{
public:
  AccessUnitList()
  {
    clearAu();
  }

  ~AccessUnitList()
  {
    clearAu();
  }

  void clearAu()
  {
    cts          = 0;
    dts          = 0;
    poc          = 0;
    sliceType     = VVENC_NUMBER_OF_SLICE_TYPES;
    temporalLayer = 0;
    status        = 0;
    ctsValid      = false;
    dtsValid      = false;
    rap           = false;
    refPic        = false;
    InfoString.clear();

    for( AccessUnitList::iterator it = this->begin(); it != this->end(); it++ )
    {
      delete* it;
    }
    std::list<NALUnitEBSP*>::clear();
  }

  void detachNalUnitList()
  {
    std::list<NALUnitEBSP*>::clear();
  }

  uint64_t        cts;                                   ///< composition time stamp
  uint64_t        dts;                                   ///< decoding time stamp
  uint64_t        poc;                                   ///< picture order count
  vvencSliceType  sliceType;                              ///< slice type (I/P/B) */
  int             temporalLayer;                          ///< temporal layer
  int             status;
  bool            ctsValid;                               ///< composition time stamp valid flag
  bool            dtsValid;                               ///< decoding time stamp valid flag
  bool            rap;                                    ///< random access point flag
  bool            refPic;                                 ///< reference picture
  std::string     InfoString;
};


static inline const char* nalUnitTypeToString(vvencNalUnitType type)
{
  switch (type)
  {
  case VVENC_NAL_UNIT_CODED_SLICE_TRAIL:      return "TRAIL";
  case VVENC_NAL_UNIT_CODED_SLICE_STSA:       return "STSA";
  case VVENC_NAL_UNIT_CODED_SLICE_RADL:       return "RADL";
  case VVENC_NAL_UNIT_CODED_SLICE_RASL:       return "RASL";
  case VVENC_NAL_UNIT_CODED_SLICE_IDR_W_RADL: return "IDR_W_RADL";
  case VVENC_NAL_UNIT_CODED_SLICE_IDR_N_LP:   return "IDR_N_LP";
  case VVENC_NAL_UNIT_CODED_SLICE_CRA:        return "CRA";
  case VVENC_NAL_UNIT_CODED_SLICE_GDR:        return "GDR";
  case VVENC_NAL_UNIT_DCI:                    return "DCI";
  case VVENC_NAL_UNIT_VPS:                    return "VPS";
  case VVENC_NAL_UNIT_SPS:                    return "SPS";
  case VVENC_NAL_UNIT_PPS:                    return "PPS";
  case VVENC_NAL_UNIT_PREFIX_APS:             return "Prefix APS";
  case VVENC_NAL_UNIT_SUFFIX_APS:             return "Suffix APS";
  case VVENC_NAL_UNIT_PH:                     return "PH";
  case VVENC_NAL_UNIT_ACCESS_UNIT_DELIMITER:  return "AUD";
  case VVENC_NAL_UNIT_EOS:                    return "EOS";
  case VVENC_NAL_UNIT_EOB:                    return "EOB";
  case VVENC_NAL_UNIT_PREFIX_SEI:             return "Prefix SEI";
  case VVENC_NAL_UNIT_SUFFIX_SEI:             return "Suffix SEI";
  case VVENC_NAL_UNIT_FD:                     return "FD";
  default:                              return "UNK";
  }
}


} // namespace vvenc

//! \}

