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
29 typedef struct H264PredWeightTable {
31 int use_weight_chroma;
32 int luma_log2_weight_denom;
33 int chroma_log2_weight_denom;
34 int luma_weight_flag[2]; ///< 7.4.3.2 luma_weight_lX_flag
35 int chroma_weight_flag[2]; ///< 7.4.3.2 chroma_weight_lX_flag
36 // The following 2 can be changed to int8_t but that causes a 10 CPU cycles speed loss
37 int luma_weight[48][2][2];
38 int chroma_weight[48][2][2][2];
39 int implicit_weight[48][48][2];
40 } H264PredWeightTable;
42 typedef struct H264POCContext {
48 int prev_poc_msb; ///< poc_msb of the last reference pic for POC type 0
49 int prev_poc_lsb; ///< poc_lsb of the last reference pic for POC type 0
50 int frame_num_offset; ///< for POC type 2
51 int prev_frame_num_offset; ///< for POC type 2
52 int prev_frame_num; ///< frame_num of the last pic for POC type 1/2
59 int ff_h264_pred_weight_table(GetBitContext *gb, const struct SPS *sps,
60 const int *ref_count, int slice_type_nos,
61 H264PredWeightTable *pwt, void *logctx);
64 * Check if the top & left blocks are available if needed & change the
65 * dc mode so it only uses the available blocks.
67 int ff_h264_check_intra4x4_pred_mode(int8_t *pred_mode_cache, void *logctx,
68 int top_samples_available, int left_samples_available);
71 * Check if the top & left blocks are available if needed & change the
72 * dc mode so it only uses the available blocks.
74 int ff_h264_check_intra_pred_mode(void *logctx, int top_samples_available,
75 int left_samples_available,
76 int mode, int is_chroma);
78 int ff_h264_parse_ref_count(int *plist_count, int ref_count[2],
79 GetBitContext *gb, const struct PPS *pps,
80 int slice_type_nos, int picture_structure, void *logctx);
82 int ff_h264_init_poc(int pic_field_poc[2], int *pic_poc,
83 const struct SPS *sps, H264POCContext *poc,
84 int picture_structure, int nal_ref_idc);
86 int ff_h264_decode_extradata(const uint8_t *data, int size, struct H264ParamSets *ps,
87 int *is_avc, int *nal_length_size,
88 int err_recognition, void *logctx);
91 * compute profile from sps
93 int ff_h264_get_profile(const struct SPS *sps);
95 #endif /* AVCODEC_H264_PARSE_H */