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1 | /* | ||
2 | * AV1 common parsing code | ||
3 | * | ||
4 | * This file is part of FFmpeg. | ||
5 | * | ||
6 | * FFmpeg is free software; you can redistribute it and/or | ||
7 | * modify it under the terms of the GNU Lesser General Public | ||
8 | * License as published by the Free Software Foundation; either | ||
9 | * version 2.1 of the License, or (at your option) any later version. | ||
10 | * | ||
11 | * FFmpeg is distributed in the hope that it will be useful, | ||
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
14 | * Lesser General Public License for more details. | ||
15 | * | ||
16 | * You should have received a copy of the GNU Lesser General Public | ||
17 | * License along with FFmpeg; if not, write to the Free Software | ||
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
19 | */ | ||
20 | |||
21 | #ifndef AVCODEC_AV1_PARSE_H | ||
22 | #define AVCODEC_AV1_PARSE_H | ||
23 | |||
24 | #include <limits.h> | ||
25 | #include <stdint.h> | ||
26 | |||
27 | #include "libavutil/error.h" | ||
28 | #include "libavutil/intmath.h" | ||
29 | #include "libavutil/macros.h" | ||
30 | |||
31 | #include "av1.h" | ||
32 | #include "get_bits.h" | ||
33 | #include "leb.h" | ||
34 | |||
35 | // OBU header fields + max leb128 length | ||
36 | #define MAX_OBU_HEADER_SIZE (2 + 8) | ||
37 | |||
38 | typedef struct AV1OBU { | ||
39 | /** Size of payload */ | ||
40 | int size; | ||
41 | const uint8_t *data; | ||
42 | |||
43 | /** | ||
44 | * Size, in bits, of just the data, excluding the trailing_one_bit and | ||
45 | * any trailing padding. | ||
46 | */ | ||
47 | int size_bits; | ||
48 | |||
49 | /** Size of entire OBU, including header */ | ||
50 | int raw_size; | ||
51 | const uint8_t *raw_data; | ||
52 | |||
53 | int type; | ||
54 | |||
55 | int temporal_id; | ||
56 | int spatial_id; | ||
57 | } AV1OBU; | ||
58 | |||
59 | /** An input packet split into OBUs */ | ||
60 | typedef struct AV1Packet { | ||
61 | AV1OBU *obus; | ||
62 | int nb_obus; | ||
63 | int obus_allocated; | ||
64 | unsigned obus_allocated_size; | ||
65 | } AV1Packet; | ||
66 | |||
67 | /** | ||
68 | * Extract an OBU from a raw bitstream. | ||
69 | * | ||
70 | * @note This function does not copy or store any bitstream data. All | ||
71 | * the pointers in the AV1OBU structure will be valid as long | ||
72 | * as the input buffer also is. | ||
73 | */ | ||
74 | int ff_av1_extract_obu(AV1OBU *obu, const uint8_t *buf, int length, | ||
75 | void *logctx); | ||
76 | |||
77 | /** | ||
78 | * Split an input packet into OBUs. | ||
79 | * | ||
80 | * @note This function does not copy or store any bitstream data. All | ||
81 | * the pointers in the AV1Packet structure will be valid as | ||
82 | * long as the input buffer also is. | ||
83 | */ | ||
84 | int ff_av1_packet_split(AV1Packet *pkt, const uint8_t *buf, int length, | ||
85 | void *logctx); | ||
86 | |||
87 | /** | ||
88 | * Free all the allocated memory in the packet. | ||
89 | */ | ||
90 | void ff_av1_packet_uninit(AV1Packet *pkt); | ||
91 | |||
92 | 1543 | static inline int parse_obu_header(const uint8_t *buf, int buf_size, | |
93 | int64_t *obu_size, int *start_pos, int *type, | ||
94 | int *temporal_id, int *spatial_id) | ||
95 | { | ||
96 | GetBitContext gb; | ||
97 | int ret, extension_flag, has_size_flag; | ||
98 | int64_t size; | ||
99 | |||
100 | 1543 | ret = init_get_bits8(&gb, buf, FFMIN(buf_size, MAX_OBU_HEADER_SIZE)); | |
101 |
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1543 | if (ret < 0) |
102 | ✗ | return ret; | |
103 | |||
104 |
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1543 | if (get_bits1(&gb) != 0) // obu_forbidden_bit |
105 | 34 | return AVERROR_INVALIDDATA; | |
106 | |||
107 | 1509 | *type = get_bits(&gb, 4); | |
108 | 1509 | extension_flag = get_bits1(&gb); | |
109 | 1509 | has_size_flag = get_bits1(&gb); | |
110 | 1509 | skip_bits1(&gb); // obu_reserved_1bit | |
111 | |||
112 |
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1509 | if (extension_flag) { |
113 | 1076 | *temporal_id = get_bits(&gb, 3); | |
114 | 1076 | *spatial_id = get_bits(&gb, 2); | |
115 | 1076 | skip_bits(&gb, 3); // extension_header_reserved_3bits | |
116 | } else { | ||
117 | 433 | *temporal_id = *spatial_id = 0; | |
118 | } | ||
119 | |||
120 | 1340 | *obu_size = has_size_flag ? get_leb128(&gb) | |
121 |
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1509 | : buf_size - 1 - extension_flag; |
122 | |||
123 |
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1509 | if (get_bits_left(&gb) < 0) |
124 | 42 | return AVERROR_INVALIDDATA; | |
125 | |||
126 | 1467 | *start_pos = get_bits_count(&gb) / 8; | |
127 | |||
128 | 1467 | size = *obu_size + *start_pos; | |
129 | |||
130 |
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1467 | if (size > buf_size) |
131 | 660 | return AVERROR_INVALIDDATA; | |
132 | |||
133 | 807 | return size; | |
134 | } | ||
135 | |||
136 | 141 | static inline int get_obu_bit_length(const uint8_t *buf, int size, int type) | |
137 | { | ||
138 | int v; | ||
139 | |||
140 | /* There are no trailing bits on these */ | ||
141 |
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141 | if (type == AV1_OBU_TILE_GROUP || |
142 |
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128 | type == AV1_OBU_TILE_LIST || |
143 | type == AV1_OBU_FRAME) { | ||
144 |
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56 | if (size > INT_MAX / 8) |
145 | ✗ | return AVERROR(ERANGE); | |
146 | else | ||
147 | 56 | return size * 8; | |
148 | } | ||
149 | |||
150 |
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85 | while (size > 0 && buf[size - 1] == 0) |
151 | ✗ | size--; | |
152 | |||
153 |
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85 | if (!size) |
154 | 44 | return 0; | |
155 | |||
156 | 41 | v = buf[size - 1]; | |
157 | |||
158 |
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41 | if (size > INT_MAX / 8) |
159 | ✗ | return AVERROR(ERANGE); | |
160 | 41 | size *= 8; | |
161 | |||
162 | /* Remove the trailing_one_bit and following trailing zeros */ | ||
163 |
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41 | if (v) |
164 | 41 | size -= ff_ctz(v) + 1; | |
165 | |||
166 | 41 | return size; | |
167 | } | ||
168 | |||
169 | AVRational ff_av1_framerate(int64_t ticks_per_frame, int64_t units_per_tick, | ||
170 | int64_t time_scale); | ||
171 | |||
172 | #endif /* AVCODEC_AV1_PARSE_H */ | ||
173 |