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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 #include "h264_ps.h"
29 
30 typedef struct H264PredWeightTable {
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];
42 
43 typedef struct H264POCContext {
44  int poc_lsb;
45  int poc_msb;
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
55 
57  const int *ref_count, int slice_type_nos,
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 
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 */
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:35
int chroma_weight[48][2][2][2]
Definition: h264_parse.h:39
Sequence parameter set.
Definition: h264_ps.h:43
Picture parameter set.
Definition: h264_ps.h:108
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:128
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:176
uint8_t
int frame_num_offset
for POC type 2
Definition: h264_parse.h:51
int chroma_weight_flag[2]
7.4.3.2 chroma_weight_lX_flag
Definition: h264_parse.h:36
bitstream reader API header.
ptrdiff_t size
Definition: opengl_enc.c:101
int luma_weight[48][2][2]
Definition: h264_parse.h:38
H.264 parameter set handling.
int chroma_log2_weight_denom
Definition: h264_parse.h:34
int prev_poc_msb
poc_msb of the last reference pic for POC type 0
Definition: h264_parse.h:49
int ff_h264_decode_extradata(const uint8_t *data, int size, H264ParamSets *ps, int *is_avc, int *nal_length_size, int err_recognition, void *logctx)
Definition: h264_parse.c:436
int ff_h264_get_profile(const SPS *sps)
compute profile from sps
Definition: h264_parse.c:503
int delta_poc_bottom
Definition: h264_parse.h:46
int implicit_weight[48][48][2]
Definition: h264_parse.h:40
int prev_frame_num
frame_num of the last pic for POC type 1/2
Definition: h264_parse.h:53
static int FUNC() pps(CodedBitstreamContext *ctx, RWContext *rw, H264RawPPS *current)
static int FUNC() sps(CodedBitstreamContext *ctx, RWContext *rw, H264RawSPS *current)
int ff_h264_init_poc(int pic_field_poc[2], int *pic_poc, const SPS *sps, H264POCContext *poc, int picture_structure, int nal_ref_idc)
Definition: h264_parse.c:269
int prev_poc_lsb
poc_lsb of the last reference pic for POC type 0
Definition: h264_parse.h:50
int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps, const int *ref_count, int slice_type_nos, H264PredWeightTable *pwt, int picture_structure, void *logctx)
Definition: h264_parse.c:27
int delta_poc[2]
Definition: h264_parse.h:47
int ff_h264_parse_ref_count(int *plist_count, int ref_count[2], GetBitContext *gb, const PPS *pps, int slice_type_nos, int picture_structure, void *logctx)
Definition: h264_parse.c:216
int prev_frame_num_offset
for POC type 2
Definition: h264_parse.h:52
mode
Use these values in ebur128_init (or'ed).
Definition: ebur128.h:83