blob: 290da34d4438344140b146b5902abc58dfddb550
| 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, void *logctx); |
| 59 | |
| 60 | /** |
| 61 | * Check if the top & left blocks are available if needed & change the |
| 62 | * dc mode so it only uses the available blocks. |
| 63 | */ |
| 64 | int ff_h264_check_intra4x4_pred_mode(int8_t *pred_mode_cache, void *logctx, |
| 65 | int top_samples_available, int left_samples_available); |
| 66 | |
| 67 | /** |
| 68 | * Check if the top & left blocks are available if needed & change the |
| 69 | * dc mode so it only uses the available blocks. |
| 70 | */ |
| 71 | int ff_h264_check_intra_pred_mode(void *logctx, int top_samples_available, |
| 72 | int left_samples_available, |
| 73 | int mode, int is_chroma); |
| 74 | |
| 75 | int ff_h264_parse_ref_count(int *plist_count, int ref_count[2], |
| 76 | GetBitContext *gb, const PPS *pps, |
| 77 | int slice_type_nos, int picture_structure, void *logctx); |
| 78 | |
| 79 | int ff_h264_init_poc(int pic_field_poc[2], int *pic_poc, |
| 80 | const SPS *sps, H264POCContext *poc, |
| 81 | int picture_structure, int nal_ref_idc); |
| 82 | |
| 83 | int ff_h264_decode_extradata(const uint8_t *data, int size, H264ParamSets *ps, |
| 84 | int *is_avc, int *nal_length_size, |
| 85 | int err_recognition, void *logctx); |
| 86 | |
| 87 | /** |
| 88 | * compute profile from sps |
| 89 | */ |
| 90 | int ff_h264_get_profile(const SPS *sps); |
| 91 | |
| 92 | #endif /* AVCODEC_H264_PARSE_H */ |
| 93 |