repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ba45a60 DM |
1 | /* |
| 2 | * BMP parser | |
| 3 | * Copyright (c) 2012 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 | * BMP parser | |
| 25 | */ | |
| 26 | ||
| 27 | #include "libavutil/bswap.h" | |
| 28 | #include "libavutil/common.h" | |
| 29 | ||
| 30 | #include "parser.h" | |
| 31 | ||
| 32 | typedef struct BMPParseContext { | |
| 33 | ParseContext pc; | |
| 34 | uint32_t fsize; | |
| 35 | uint32_t remaining_size; | |
| 36 | } BMPParseContext; | |
| 37 | ||
| 38 | static int bmp_parse(AVCodecParserContext *s, AVCodecContext *avctx, | |
| 39 | const uint8_t **poutbuf, int *poutbuf_size, | |
| 40 | const uint8_t *buf, int buf_size) | |
| 41 | { | |
| 42 | BMPParseContext *bpc = s->priv_data; | |
| 43 | uint64_t state = bpc->pc.state64; | |
| 44 | int next = END_NOT_FOUND; | |
| 45 | int i = 0; | |
| 46 | ||
| 47 | *poutbuf_size = 0; | |
| 48 | ||
| 49 | restart: | |
| 50 | if (bpc->pc.frame_start_found <= 2+4+4) { | |
| 51 | for (; i < buf_size; i++) { | |
| 52 | state = (state << 8) | buf[i]; | |
| 53 | if (bpc->pc.frame_start_found == 0) { | |
| 54 | if ((state >> 48) == (('B' << 8) | 'M')) { | |
| 55 | bpc->fsize = av_bswap32(state >> 16); | |
| 56 | bpc->pc.frame_start_found = 1; | |
| 57 | } | |
| 58 | } else if (bpc->pc.frame_start_found == 2+4+4) { | |
| 59 | // unsigned hsize = av_bswap32(state>>32); | |
| 60 | unsigned ihsize = av_bswap32(state); | |
| 61 | if (ihsize < 12 || ihsize > 200) { | |
| 62 | bpc->pc.frame_start_found = 0; | |
| 63 | continue; | |
| 64 | } | |
| 65 | bpc->pc.frame_start_found++; | |
| 66 | bpc->remaining_size = bpc->fsize + i - 17; | |
| 67 | ||
| 68 | if (bpc->pc.index + i > 17) { | |
| 69 | next = i - 17; | |
| 70 | } else | |
| 71 | goto restart; | |
| 72 | } else if (bpc->pc.frame_start_found) | |
| 73 | bpc->pc.frame_start_found++; | |
| 74 | } | |
| 75 | bpc->pc.state64 = state; | |
| 76 | } else { | |
| 77 | if (bpc->remaining_size) { | |
| 78 | i = FFMIN(bpc->remaining_size, buf_size); | |
| 79 | bpc->remaining_size -= i; | |
| 80 | if (bpc->remaining_size) | |
| 81 | goto flush; | |
| 82 | ||
| 83 | bpc->pc.frame_start_found = 0; | |
| 84 | goto restart; | |
| 85 | } | |
| 86 | } | |
| 87 | ||
| 88 | flush: | |
| 89 | if (ff_combine_frame(&bpc->pc, next, &buf, &buf_size) < 0) | |
| 90 | return buf_size; | |
| 91 | ||
| 92 | bpc->pc.frame_start_found = 0; | |
| 93 | ||
| 94 | *poutbuf = buf; | |
| 95 | *poutbuf_size = buf_size; | |
| 96 | return next; | |
| 97 | } | |
| 98 | ||
| 99 | AVCodecParser ff_bmp_parser = { | |
| 100 | .codec_ids = { AV_CODEC_ID_BMP }, | |
| 101 | .priv_data_size = sizeof(BMPParseContext), | |
| 102 | .parser_parse = bmp_parse, | |
| 103 | .parser_close = ff_parse_close, | |
| 104 | }; |