| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * H.264/HEVC 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_H2645_PARSE_H | ||
| 22 | #define AVCODEC_H2645_PARSE_H | ||
| 23 | |||
| 24 | #include <stdint.h> | ||
| 25 | |||
| 26 | #include "libavutil/buffer.h" | ||
| 27 | #include "libavutil/error.h" | ||
| 28 | #include "libavutil/log.h" | ||
| 29 | #include "codec_id.h" | ||
| 30 | #include "get_bits.h" | ||
| 31 | |||
| 32 | #define MAX_MBPAIR_SIZE (256*1024) // a tighter bound could be calculated if someone cares about a few bytes | ||
| 33 | |||
| 34 | typedef struct H2645NAL { | ||
| 35 | const uint8_t *data; | ||
| 36 | int size; | ||
| 37 | |||
| 38 | /** | ||
| 39 | * Size, in bits, of just the data, excluding the stop bit and any trailing | ||
| 40 | * padding. I.e. what HEVC calls SODB. | ||
| 41 | */ | ||
| 42 | int size_bits; | ||
| 43 | |||
| 44 | int raw_size; | ||
| 45 | const uint8_t *raw_data; | ||
| 46 | |||
| 47 | GetBitContext gb; | ||
| 48 | |||
| 49 | /** | ||
| 50 | * NAL unit type | ||
| 51 | */ | ||
| 52 | int type; | ||
| 53 | |||
| 54 | /** | ||
| 55 | * H.264 only, nal_ref_idc | ||
| 56 | */ | ||
| 57 | int ref_idc; | ||
| 58 | |||
| 59 | /** | ||
| 60 | * HEVC only, nuh_temporal_id_plus_1 - 1 | ||
| 61 | */ | ||
| 62 | int temporal_id; | ||
| 63 | |||
| 64 | /* | ||
| 65 | * HEVC only, identifier of layer to which nal unit belongs | ||
| 66 | */ | ||
| 67 | int nuh_layer_id; | ||
| 68 | |||
| 69 | int skipped_bytes; | ||
| 70 | int skipped_bytes_pos_size; | ||
| 71 | int *skipped_bytes_pos; | ||
| 72 | } H2645NAL; | ||
| 73 | |||
| 74 | typedef struct H2645RBSP { | ||
| 75 | uint8_t *rbsp_buffer; | ||
| 76 | AVBufferRef *rbsp_buffer_ref; | ||
| 77 | int rbsp_buffer_alloc_size; | ||
| 78 | int rbsp_buffer_size; | ||
| 79 | } H2645RBSP; | ||
| 80 | |||
| 81 | /* an input packet split into unescaped NAL units */ | ||
| 82 | typedef struct H2645Packet { | ||
| 83 | H2645NAL *nals; | ||
| 84 | H2645RBSP rbsp; | ||
| 85 | int nb_nals; | ||
| 86 | int nals_allocated; | ||
| 87 | unsigned nal_buffer_size; | ||
| 88 | } H2645Packet; | ||
| 89 | |||
| 90 | /** | ||
| 91 | * Extract the raw (unescaped) bitstream. | ||
| 92 | */ | ||
| 93 | int ff_h2645_extract_rbsp(const uint8_t *src, int length, H2645RBSP *rbsp, | ||
| 94 | H2645NAL *nal, int small_padding); | ||
| 95 | |||
| 96 | enum { | ||
| 97 | H2645_FLAG_IS_NALFF = (1 << 0), | ||
| 98 | H2645_FLAG_SMALL_PADDING = (1 << 1), | ||
| 99 | H2645_FLAG_USE_REF = (1 << 2), | ||
| 100 | }; | ||
| 101 | |||
| 102 | /** | ||
| 103 | * Split an input packet into NAL units. | ||
| 104 | * | ||
| 105 | * If data == raw_data holds true for a NAL unit of the returned pkt, then | ||
| 106 | * said NAL unit does not contain any emulation_prevention_three_byte and | ||
| 107 | * the data is contained in the input buffer pointed to by buf. | ||
| 108 | * Otherwise, the unescaped data is part of the rbsp_buffer described by the | ||
| 109 | * packet's H2645RBSP. | ||
| 110 | * | ||
| 111 | * If the packet's rbsp_buffer_ref is not NULL, the underlying AVBuffer must | ||
| 112 | * own rbsp_buffer. If not and rbsp_buffer is not NULL, H2645_FLAG_USE_REF | ||
| 113 | * must not be set in flags. | ||
| 114 | * If H2645_FLAG_USE_REF is set in flags, rbsp_buffer will be reference-counted | ||
| 115 | * and owned by the underlying AVBuffer of rbsp_buffer_ref. | ||
| 116 | */ | ||
| 117 | int ff_h2645_packet_split(H2645Packet *pkt, const uint8_t *buf, int length, | ||
| 118 | void *logctx, int nal_length_size, | ||
| 119 | enum AVCodecID codec_id, int flags); | ||
| 120 | |||
| 121 | /** | ||
| 122 | * Free all the allocated memory in the packet. | ||
| 123 | */ | ||
| 124 | void ff_h2645_packet_uninit(H2645Packet *pkt); | ||
| 125 | |||
| 126 | 19851 | static inline int get_nalsize(int nal_length_size, const uint8_t *buf, | |
| 127 | int buf_size, int *buf_index, void *logctx) | ||
| 128 | { | ||
| 129 | 19851 | int i, nalsize = 0; | |
| 130 | |||
| 131 |
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19851 | if (*buf_index >= buf_size - nal_length_size) { |
| 132 | // the end of the buffer is reached, refill it | ||
| 133 | 331 | return AVERROR_INVALIDDATA; | |
| 134 | } | ||
| 135 | |||
| 136 |
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95652 | for (i = 0; i < nal_length_size; i++) |
| 137 | 76132 | nalsize = ((unsigned)nalsize << 8) | buf[(*buf_index)++]; | |
| 138 |
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19520 | if (nalsize <= 0 || nalsize > buf_size - *buf_index) { |
| 139 | 2 | av_log(logctx, AV_LOG_ERROR, | |
| 140 | 2 | "Invalid NAL unit size (%d > %d).\n", nalsize, buf_size - *buf_index); | |
| 141 | 2 | return AVERROR_INVALIDDATA; | |
| 142 | } | ||
| 143 | 19518 | return nalsize; | |
| 144 | } | ||
| 145 | |||
| 146 | #endif /* AVCODEC_H2645_PARSE_H */ | ||
| 147 |