| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 | 1553 | 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 | 1553 | ret = init_get_bits8(&gb, buf, FFMIN(buf_size, MAX_OBU_HEADER_SIZE)); | |
| 101 |
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1553 | if (ret < 0) |
| 102 | ✗ | return ret; | |
| 103 | |||
| 104 |
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1553 | if (get_bits1(&gb) != 0) // obu_forbidden_bit |
| 105 | 33 | return AVERROR_INVALIDDATA; | |
| 106 | |||
| 107 | 1520 | *type = get_bits(&gb, 4); | |
| 108 | 1520 | extension_flag = get_bits1(&gb); | |
| 109 | 1520 | has_size_flag = get_bits1(&gb); | |
| 110 | 1520 | skip_bits1(&gb); // obu_reserved_1bit | |
| 111 | |||
| 112 |
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1520 | if (extension_flag) { |
| 113 | 1087 | *temporal_id = get_bits(&gb, 3); | |
| 114 | 1087 | *spatial_id = get_bits(&gb, 2); | |
| 115 | 1087 | skip_bits(&gb, 3); // extension_header_reserved_3bits | |
| 116 | } else { | ||
| 117 | 433 | *temporal_id = *spatial_id = 0; | |
| 118 | } | ||
| 119 | |||
| 120 | 1349 | *obu_size = has_size_flag ? get_leb128(&gb) | |
| 121 |
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1520 | : buf_size - 1 - extension_flag; |
| 122 | |||
| 123 |
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1520 | if (get_bits_left(&gb) < 0) |
| 124 | 42 | return AVERROR_INVALIDDATA; | |
| 125 | |||
| 126 | 1478 | *start_pos = get_bits_count(&gb) / 8; | |
| 127 | |||
| 128 | 1478 | size = *obu_size + *start_pos; | |
| 129 | |||
| 130 |
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1478 | if (size > buf_size) |
| 131 | 666 | return AVERROR_INVALIDDATA; | |
| 132 | |||
| 133 | 812 | 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 |