| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * CRI parser | ||
| 3 | * Copyright (c) 2021 Paul B Mahol | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | /** | ||
| 23 | * @file | ||
| 24 | * CRI parser | ||
| 25 | */ | ||
| 26 | |||
| 27 | #include "libavutil/bswap.h" | ||
| 28 | #include "libavutil/common.h" | ||
| 29 | |||
| 30 | #include "parser.h" | ||
| 31 | #include "parser_internal.h" | ||
| 32 | |||
| 33 | typedef struct CRIParser { | ||
| 34 | ParseContext pc; | ||
| 35 | int count; | ||
| 36 | int chunk; | ||
| 37 | int read_bytes; | ||
| 38 | int skip_bytes; | ||
| 39 | } CRIParser; | ||
| 40 | |||
| 41 | #define KEY (((uint64_t)'\1' << 56) | ((uint64_t)'\0' << 48) | \ | ||
| 42 | ((uint64_t)'\0' << 40) | ((uint64_t)'\0' << 32) | \ | ||
| 43 | ((uint64_t)'\4' << 24) | ((uint64_t)'\0' << 16) | \ | ||
| 44 | ((uint64_t)'\0' << 8) | ((uint64_t)'\0' << 0)) | ||
| 45 | |||
| 46 | ✗ | static int cri_parse(AVCodecParserContext *s, AVCodecContext *avctx, | |
| 47 | const uint8_t **poutbuf, int *poutbuf_size, | ||
| 48 | const uint8_t *buf, int buf_size) | ||
| 49 | { | ||
| 50 | ✗ | CRIParser *bpc = s->priv_data; | |
| 51 | ✗ | uint64_t state = bpc->pc.state64; | |
| 52 | ✗ | int next = END_NOT_FOUND, i = 0; | |
| 53 | |||
| 54 | ✗ | s->pict_type = AV_PICTURE_TYPE_I; | |
| 55 | ✗ | s->key_frame = 1; | |
| 56 | ✗ | s->duration = 1; | |
| 57 | |||
| 58 | ✗ | *poutbuf_size = 0; | |
| 59 | ✗ | *poutbuf = NULL; | |
| 60 | |||
| 61 | ✗ | for (; i < buf_size; i++) { | |
| 62 | ✗ | state = (state << 8) | buf[i]; | |
| 63 | ✗ | bpc->read_bytes++; | |
| 64 | |||
| 65 | ✗ | if (bpc->skip_bytes > 0) { | |
| 66 | ✗ | bpc->skip_bytes--; | |
| 67 | ✗ | if (bpc->skip_bytes == 0) | |
| 68 | ✗ | bpc->read_bytes = 0; | |
| 69 | } else { | ||
| 70 | ✗ | if (state != KEY) | |
| 71 | ✗ | continue; | |
| 72 | } | ||
| 73 | |||
| 74 | ✗ | if (bpc->skip_bytes == 0 && bpc->read_bytes >= 8) { | |
| 75 | ✗ | bpc->skip_bytes = av_bswap32(state & 0xFFFFFFFF); | |
| 76 | ✗ | bpc->chunk = state >> 32; | |
| 77 | ✗ | bpc->read_bytes = 0; | |
| 78 | ✗ | bpc->count++; | |
| 79 | } | ||
| 80 | |||
| 81 | ✗ | if (bpc->chunk == 0x01000000 && bpc->skip_bytes == 4 && | |
| 82 | ✗ | bpc->read_bytes == 0 && bpc->count > 1) { | |
| 83 | ✗ | next = i - 7; | |
| 84 | ✗ | break; | |
| 85 | } | ||
| 86 | } | ||
| 87 | |||
| 88 | ✗ | bpc->pc.state64 = state; | |
| 89 | ✗ | if (ff_combine_frame(&bpc->pc, next, &buf, &buf_size) < 0) { | |
| 90 | ✗ | *poutbuf = NULL; | |
| 91 | ✗ | *poutbuf_size = 0; | |
| 92 | ✗ | return buf_size; | |
| 93 | } | ||
| 94 | |||
| 95 | ✗ | *poutbuf = buf; | |
| 96 | ✗ | *poutbuf_size = buf_size; | |
| 97 | |||
| 98 | ✗ | return next; | |
| 99 | } | ||
| 100 | |||
| 101 | const FFCodecParser ff_cri_parser = { | ||
| 102 | PARSER_CODEC_LIST(AV_CODEC_ID_CRI), | ||
| 103 | .priv_data_size = sizeof(CRIParser), | ||
| 104 | .parse = cri_parse, | ||
| 105 | .close = ff_parse_close, | ||
| 106 | }; | ||
| 107 |