1 /* 2 * This file is part of FFmpeg. 3 * 4 * FFmpeg is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Lesser General Public 6 * License as published by the Free Software Foundation; either 7 * version 2.1 of the License, or (at your option) any later version. 8 * 9 * FFmpeg is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Lesser General Public License for more details. 13 * 14 * You should have received a copy of the GNU Lesser General Public 15 * License along with FFmpeg; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 19 /** 20 * @file 21 * H.264 decoder/parser shared code 22 */ 23 24 #ifndef AVCODEC_H264_PARSE_H 25 #define AVCODEC_H264_PARSE_H 26 27 #include "get_bits.h" 28 #include "h264_ps.h" 29 30 typedef struct H264PredWeightTable { 31 int use_weight; 32 int use_weight_chroma; 33 int luma_log2_weight_denom; 34 int chroma_log2_weight_denom; 35 int luma_weight_flag[2]; ///< 7.4.3.2 luma_weight_lX_flag 36 int chroma_weight_flag[2]; ///< 7.4.3.2 chroma_weight_lX_flag 37 // The following 2 can be changed to int8_t but that causes a 10 CPU cycles speed loss 38 int luma_weight[48][2][2]; 39 int chroma_weight[48][2][2][2]; 40 int implicit_weight[48][48][2]; 41 } H264PredWeightTable; 42 43 typedef struct H264POCContext { 44 int poc_lsb; 45 int poc_msb; 46 int delta_poc_bottom; 47 int delta_poc[2]; 48 int frame_num; 49 int prev_poc_msb; ///< poc_msb of the last reference pic for POC type 0 50 int prev_poc_lsb; ///< poc_lsb of the last reference pic for POC type 0 51 int frame_num_offset; ///< for POC type 2 52 int prev_frame_num_offset; ///< for POC type 2 53 int prev_frame_num; ///< frame_num of the last pic for POC type 1/2 54 } H264POCContext; 55 56 int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps, 57 const int *ref_count, int slice_type_nos, 58 H264PredWeightTable *pwt, 59 int picture_structure, void *logctx); 60 61 /** 62 * Check if the top & left blocks are available if needed & change the 63 * dc mode so it only uses the available blocks. 64 */ 65 int ff_h264_check_intra4x4_pred_mode(int8_t *pred_mode_cache, void *logctx, 66 int top_samples_available, int left_samples_available); 67 68 /** 69 * Check if the top & left blocks are available if needed & change the 70 * dc mode so it only uses the available blocks. 71 */ 72 int ff_h264_check_intra_pred_mode(void *logctx, int top_samples_available, 73 int left_samples_available, 74 int mode, int is_chroma); 75 76 int ff_h264_parse_ref_count(int *plist_count, int ref_count[2], 77 GetBitContext *gb, const PPS *pps, 78 int slice_type_nos, int picture_structure, void *logctx); 79 80 int ff_h264_init_poc(int pic_field_poc[2], int *pic_poc, 81 const SPS *sps, H264POCContext *poc, 82 int picture_structure, int nal_ref_idc); 83 84 int ff_h264_decode_extradata(const uint8_t *data, int size, H264ParamSets *ps, 85 int *is_avc, int *nal_length_size, 86 int err_recognition, void *logctx); 87 88 /** 89 * compute profile from sps 90 */ 91 int ff_h264_get_profile(const SPS *sps); 92 93 #endif /* AVCODEC_H264_PARSE_H */ 94