/*

 * HEIF codec.

 * Copyright (c) 2024 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 "vvc_enc.h"

#include "vvc_boxes.h"

#include "error.h"

#include "context.h"

#include "api_structs.h"

#include <string>

Result<Encoder::CodedImageData> Encoder_VVC::encode(const std::shared_ptr<HeifPixelImage>& image,

                                                    struct heif_encoder* encoder,

                                                    const struct heif_encoding_options& options,

                                                    enum heif_image_input_class input_class)

{

  Encoder::CodedImageData codedImage;

  auto vvcC = std::make_shared<Box_vvcC>();

  codedImage.properties.push_back(vvcC);

  heif_image c_api_image;

  c_api_image.image = image;

  struct heif_error err = encoder->plugin->encode_image(encoder->encoder, &c_api_image, input_class);

  if (err.code) {

    return Error(err.code,

                 err.subcode,

                 err.message);

  }

  int encoded_width = 0;

  int encoded_height = 0;

  for (;;) {

    uint8_t* data;

    int size;

    encoder->plugin->get_compressed_data(encoder->encoder, &data, &size, NULL);

    if (data == NULL) {

      break;

    }

    const uint8_t NAL_SPS = 15;

    uint8_t nal_type = 0;

    if (size>=2) {

      nal_type = (data[1] >> 3) & 0x1F;

    }

    if (nal_type == NAL_SPS) {

      Box_vvcC::configuration config;

      parse_sps_for_vvcC_configuration(data, size, &config, &encoded_width, &encoded_height);

      vvcC->set_configuration(config);

    }

    switch (nal_type) {

      case 14: // VPS

      case 15: // SPS

      case 16: // PPS

        vvcC->append_nal_data(data, size);

        break;

      default:

        codedImage.append_with_4bytes_size(data, size);

    }

  }

  codedImage.codingConstraints.intra_pred_used = true;

  codedImage.codingConstraints.all_ref_pics_intra = true; // TODO: change when we use predicted frames

  codedImage.codingConstraints.max_ref_per_pic = 0;

  return codedImage;

}

std::shared_ptr<class Box_VisualSampleEntry> Encoder_VVC::get_sample_description_box(const CodedImageData& data) const

{

  auto vvc1 = std::make_shared<Box_vvc1>();

  vvc1->get_VisualSampleEntry().compressorname = "VVC";

  for (auto prop : data.properties) {

    if (prop->get_short_type() == fourcc("vvcC")) {

      vvc1->append_child_box(prop);

      return vvc1;

    }

  }

  assert(false); // no hvcC generated

  return nullptr;

}