2 * This file is part of FFmpeg.
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.
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.
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
21 * H.264 decoder/parser shared code
24 #ifndef AVCODEC_H264_PARSE_H
25 #define AVCODEC_H264_PARSE_H
30 typedef struct H264PredWeightTable {
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;
43 typedef struct H264POCContext {
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
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);
62 * Check if the top & left blocks are available if needed & change the
63 * dc mode so it only uses the available blocks.
65 int ff_h264_check_intra4x4_pred_mode(int8_t *pred_mode_cache, void *logctx,
66 int top_samples_available, int left_samples_available);
69 * Check if the top & left blocks are available if needed & change the
70 * dc mode so it only uses the available blocks.
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);
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);
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);
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);
89 * compute profile from sps
91 int ff_h264_get_profile(const SPS *sps);
93 #endif /* AVCODEC_H264_PARSE_H */