/*

  * 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 */