text: /*
   * This file is part of FFmpeg.
   *
   * FFmpeg 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 2.1 of the License, or (at your option) any later version.
   *
   * FFmpeg 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 FFmpeg; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  /**
   * @file
   * H.264 decoder/parser shared code
   */
  
  #ifndef AVCODEC_H264_PARSE_H
  #define AVCODEC_H264_PARSE_H
  
  #include "get_bits.h"
  #include "h264_ps.h"
  
  typedef struct H264PredWeightTable {
      int use_weight;
      int use_weight_chroma;
      int luma_log2_weight_denom;
      int chroma_log2_weight_denom;
      int luma_weight_flag[2];    ///< 7.4.3.2 luma_weight_lX_flag
      int chroma_weight_flag[2];  ///< 7.4.3.2 chroma_weight_lX_flag
      // The following 2 can be changed to int8_t but that causes a 10 CPU cycles speed loss
      int luma_weight[48][2][2];
      int chroma_weight[48][2][2][2];
      int implicit_weight[48][48][2];
  } H264PredWeightTable;
  
  typedef struct H264POCContext {
      int poc_lsb;
      int poc_msb;
      int delta_poc_bottom;
      int delta_poc[2];
      int frame_num;
      int prev_poc_msb;           ///< poc_msb of the last reference pic for POC type 0
      int prev_poc_lsb;           ///< poc_lsb of the last reference pic for POC type 0
      int frame_num_offset;       ///< for POC type 2
      int prev_frame_num_offset;  ///< for POC type 2
      int prev_frame_num;         ///< frame_num of the last pic for POC type 1/2
  } H264POCContext;
  
  int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps,
                                const int *ref_count, int slice_type_nos,
                                H264PredWeightTable *pwt,
                                int picture_structure, void *logctx);
  
  /**
   * Check if the top & left blocks are available if needed & change the
   * dc mode so it only uses the available blocks.
   */
  int ff_h264_check_intra4x4_pred_mode(int8_t *pred_mode_cache, void *logctx,
                                       int top_samples_available, int left_samples_available);
  
  /**
   * Check if the top & left blocks are available if needed & change the
   * dc mode so it only uses the available blocks.
   */
  int ff_h264_check_intra_pred_mode(void *logctx, int top_samples_available,
                                    int left_samples_available,
                                    int mode, int is_chroma);
  
  int ff_h264_parse_ref_count(int *plist_count, int ref_count[2],
                              GetBitContext *gb, const PPS *pps,
                              int slice_type_nos, int picture_structure, void *logctx);
  
  int ff_h264_init_poc(int pic_field_poc[2], int *pic_poc,
                       const SPS *sps, H264POCContext *poc,
                       int picture_structure, int nal_ref_idc);
  
  int ff_h264_decode_extradata(const uint8_t *data, int size, H264ParamSets *ps,
                               int *is_avc, int *nal_length_size,
                               int err_recognition, void *logctx);
  
  /**
   * compute profile from sps
   */
  int ff_h264_get_profile(const SPS *sps);
  
  #endif /* AVCODEC_H264_PARSE_H */
  