/*

 * HEIF codec.

 * Copyright (c) 2023 Dirk Farin <dirk.farin@gmail.com>

 *

 * This file is part of libheif.

 *

 * libheif is free software: you can redistribute it and/or modify

 * it under the terms of the GNU Lesser General Public License as

 * published by the Free Software Foundation, either version 3 of

 * the License, or (at your option) any later version.

 *

 * libheif is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with libheif.  If not, see <http://www.gnu.org/licenses/>.

 */

#include <map>

#include <memory>

#include "libheif/heif.h"

static const int AVC_NAL_UNIT_MAX_VCL    = 5;

static const int AVC_NAL_UNIT_SPS_NUT    = 7;

static const int AVC_NAL_UNIT_PPS_NUT    = 8;

static const int AVC_NAL_UNIT_SPS_EXT_NUT = 13;

static const int HEVC_NAL_UNIT_MAX_VCL    = 31;

static const int HEVC_NAL_UNIT_VPS_NUT    = 32;

static const int HEVC_NAL_UNIT_SPS_NUT    = 33;

static const int HEVC_NAL_UNIT_PPS_NUT    = 34;

static const int HEVC_NAL_UNIT_IDR_W_RADL = 19;

static const int HEVC_NAL_UNIT_IDR_N_LP   = 20;

static const int VVC_NAL_UNIT_MAX_VCL    = 11;

static const int VVC_NAL_UNIT_VPS_NUT    = 14;

static const int VVC_NAL_UNIT_SPS_NUT    = 15;

static const int VVC_NAL_UNIT_PPS_NUT    = 16;

static const int VVC_NAL_UNIT_SUFFIX_SEI_NUT = 24;

class NalUnit

{

public:

    NalUnit();

    ~NalUnit() = default;

    bool set_data(const unsigned char* in_data, int n);

    int size() const { return nal_data_size; }

    int unit_type() const { return nal_unit_type;  }

    const unsigned char* data() const { return nal_data_ptr; }

    int bitExtracted(int number, int bits_count, int position_nr);

private:

    const unsigned char* nal_data_ptr;

    int nal_unit_type;

    int nal_data_size;

};

class NalMap

{

public:

    size_t count(int nal_type);

    const unsigned char* data(int nal_type);

    int size(int nal_type);

    const heif_error parseHevcNalu(const uint8_t *cdata, size_t size);

    void clear();

private:

    std::map<int, std::unique_ptr<NalUnit>> map;

};