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h264_parse.h
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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 
29 typedef struct H264PredWeightTable {
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];
41 
42 typedef struct H264POCContext {
43  int poc_lsb;
44  int poc_msb;
46  int delta_poc[2];
47  int frame_num;
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
54 
55 struct SPS;
56 struct PPS;
57 struct H264ParamSets;
58 
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);
62 
63 /**
64  * Check if the top & left blocks are available if needed & change the
65  * dc mode so it only uses the available blocks.
66  */
67 int ff_h264_check_intra4x4_pred_mode(int8_t *pred_mode_cache, void *logctx,
68  int top_samples_available, int left_samples_available);
69 
70 /**
71  * Check if the top & left blocks are available if needed & change the
72  * dc mode so it only uses the available blocks.
73  */
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);
77 
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);
81 
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);
85 
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);
89 
90 /**
91  * compute profile from sps
92  */
93 int ff_h264_get_profile(const struct SPS *sps);
94 
95 #endif /* AVCODEC_H264_PARSE_H */
int ff_h264_init_poc(int pic_field_poc[2], int *pic_poc, const struct SPS *sps, H264POCContext *poc, int picture_structure, int nal_ref_idc)
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
int luma_weight_flag[2]
7.4.3.2 luma_weight_lX_flag
Definition: h264_parse.h:34
int chroma_weight[48][2][2][2]
Definition: h264_parse.h:38
Sequence parameter set.
Definition: h264.h:136
Picture parameter set.
Definition: h264.h:200
int ff_h264_get_profile(const struct SPS *sps)
compute profile from sps
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 avail...
Definition: h264_parse.c:103
int ff_h264_check_intra_pred_mode(void *logctx, int top_samples_available, int left_samples_available, int mode, int is_chroma)
Check if the top & left blocks are available if needed & change the dc mode so it only uses the avail...
Definition: h264_parse.c:151
const PPS * pps
Definition: h264.h:236
uint8_t
mode
Definition: f_perms.c:27
int frame_num_offset
for POC type 2
Definition: h264_parse.h:50
int chroma_weight_flag[2]
7.4.3.2 chroma_weight_lX_flag
Definition: h264_parse.h:35
bitstream reader API header.
ptrdiff_t size
Definition: opengl_enc.c:101
int luma_weight[48][2][2]
Definition: h264_parse.h:37
int chroma_log2_weight_denom
Definition: h264_parse.h:33
int ff_h264_parse_ref_count(int *plist_count, int ref_count[2], GetBitContext *gb, const struct PPS *pps, int slice_type_nos, int picture_structure, void *logctx)
int prev_poc_msb
poc_msb of the last reference pic for POC type 0
Definition: h264_parse.h:48
int ff_h264_decode_extradata(const uint8_t *data, int size, struct H264ParamSets *ps, int *is_avc, int *nal_length_size, int err_recognition, void *logctx)
Definition: h264_parse.c:412
int delta_poc_bottom
Definition: h264_parse.h:45
int implicit_weight[48][48][2]
Definition: h264_parse.h:39
int prev_frame_num
frame_num of the last pic for POC type 1/2
Definition: h264_parse.h:52
int prev_poc_lsb
poc_lsb of the last reference pic for POC type 0
Definition: h264_parse.h:49
int ff_h264_pred_weight_table(GetBitContext *gb, const struct SPS *sps, const int *ref_count, int slice_type_nos, H264PredWeightTable *pwt, void *logctx)
int delta_poc[2]
Definition: h264_parse.h:46
SPS * sps
Definition: h264.h:238
int prev_frame_num_offset
for POC type 2
Definition: h264_parse.h:51