FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/h264_parse.h
Date: 2022-05-23 03:24:52
Exec Total Coverage
Lines: 2 2 100.0%
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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 "config.h"
28
29 #include <stdint.h>
30
31 #include "libavutil/attributes.h"
32
33 #include "get_bits.h"
34 #include "h264_ps.h"
35
36 #define MB_TYPE_REF0 MB_TYPE_ACPRED // dirty but it fits in 16 bit
37 #define MB_TYPE_8x8DCT 0x01000000
38
39 // This table must be here because scan8[constant] must be known at compiletime
40 static const uint8_t scan8[16 * 3 + 3] = {
41 4 + 1 * 8, 5 + 1 * 8, 4 + 2 * 8, 5 + 2 * 8,
42 6 + 1 * 8, 7 + 1 * 8, 6 + 2 * 8, 7 + 2 * 8,
43 4 + 3 * 8, 5 + 3 * 8, 4 + 4 * 8, 5 + 4 * 8,
44 6 + 3 * 8, 7 + 3 * 8, 6 + 4 * 8, 7 + 4 * 8,
45 4 + 6 * 8, 5 + 6 * 8, 4 + 7 * 8, 5 + 7 * 8,
46 6 + 6 * 8, 7 + 6 * 8, 6 + 7 * 8, 7 + 7 * 8,
47 4 + 8 * 8, 5 + 8 * 8, 4 + 9 * 8, 5 + 9 * 8,
48 6 + 8 * 8, 7 + 8 * 8, 6 + 9 * 8, 7 + 9 * 8,
49 4 + 11 * 8, 5 + 11 * 8, 4 + 12 * 8, 5 + 12 * 8,
50 6 + 11 * 8, 7 + 11 * 8, 6 + 12 * 8, 7 + 12 * 8,
51 4 + 13 * 8, 5 + 13 * 8, 4 + 14 * 8, 5 + 14 * 8,
52 6 + 13 * 8, 7 + 13 * 8, 6 + 14 * 8, 7 + 14 * 8,
53 0 + 0 * 8, 0 + 5 * 8, 0 + 10 * 8
54 };
55
56 /**
57 * Memory management control operation opcode.
58 */
59 typedef enum MMCOOpcode {
60 MMCO_END = 0,
61 MMCO_SHORT2UNUSED,
62 MMCO_LONG2UNUSED,
63 MMCO_SHORT2LONG,
64 MMCO_SET_MAX_LONG,
65 MMCO_RESET,
66 MMCO_LONG,
67 } MMCOOpcode;
68
69 typedef struct H264PredWeightTable {
70 int use_weight;
71 int use_weight_chroma;
72 int luma_log2_weight_denom;
73 int chroma_log2_weight_denom;
74 int luma_weight_flag[2]; ///< 7.4.3.2 luma_weight_lX_flag
75 int chroma_weight_flag[2]; ///< 7.4.3.2 chroma_weight_lX_flag
76 // The following 2 can be changed to int8_t but that causes a 10 CPU cycles speed loss
77 int luma_weight[48][2][2];
78 int chroma_weight[48][2][2][2];
79 int implicit_weight[48][48][2];
80 } H264PredWeightTable;
81
82 typedef struct H264POCContext {
83 int poc_lsb;
84 int poc_msb;
85 int delta_poc_bottom;
86 int delta_poc[2];
87 int frame_num;
88 int prev_poc_msb; ///< poc_msb of the last reference pic for POC type 0
89 int prev_poc_lsb; ///< poc_lsb of the last reference pic for POC type 0
90 int frame_num_offset; ///< for POC type 2
91 int prev_frame_num_offset; ///< for POC type 2
92 int prev_frame_num; ///< frame_num of the last pic for POC type 1/2
93 } H264POCContext;
94
95 int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps,
96 const int *ref_count, int slice_type_nos,
97 H264PredWeightTable *pwt,
98 int picture_structure, void *logctx);
99
100 /**
101 * Check if the top & left blocks are available if needed & change the
102 * dc mode so it only uses the available blocks.
103 */
104 int ff_h264_check_intra4x4_pred_mode(int8_t *pred_mode_cache, void *logctx,
105 int top_samples_available, int left_samples_available);
106
107 /**
108 * Check if the top & left blocks are available if needed & change the
109 * dc mode so it only uses the available blocks.
110 */
111 int ff_h264_check_intra_pred_mode(void *logctx, int top_samples_available,
112 int left_samples_available,
113 int mode, int is_chroma);
114
115 int ff_h264_parse_ref_count(int *plist_count, int ref_count[2],
116 GetBitContext *gb, const PPS *pps,
117 int slice_type_nos, int picture_structure, void *logctx);
118
119 int ff_h264_init_poc(int pic_field_poc[2], int *pic_poc,
120 const SPS *sps, H264POCContext *poc,
121 int picture_structure, int nal_ref_idc);
122
123 int ff_h264_decode_extradata(const uint8_t *data, int size, H264ParamSets *ps,
124 int *is_avc, int *nal_length_size,
125 int err_recognition, void *logctx);
126
127 34423535 static av_always_inline uint32_t pack16to32(unsigned a, unsigned b)
128 {
129 #if HAVE_BIGENDIAN
130 return (b & 0xFFFF) + (a << 16);
131 #else
132 34423535 return (a & 0xFFFF) + (b << 16);
133 #endif
134 }
135
136 #endif /* AVCODEC_H264_PARSE_H */
137