| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 | 88 | 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 | 88 | BMPParseContext *bpc = s->priv_data; | |
| 43 | 88 | uint64_t state = bpc->pc.state64; | |
| 44 | 88 | int next = END_NOT_FOUND; | |
| 45 | 88 | int i = 0; | |
| 46 | |||
| 47 | 88 | *poutbuf_size = 0; | |
| 48 | 88 | *poutbuf = NULL; | |
| 49 | |||
| 50 | 36 | restart: | |
| 51 |
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124 | if (bpc->pc.frame_start_found <= 2+4+4) { |
| 52 |
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3831 | for (; i < buf_size; i++) { |
| 53 | 3786 | state = (state << 8) | buf[i]; | |
| 54 |
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3786 | if (bpc->pc.frame_start_found == 0) { |
| 55 |
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3576 | if ((state >> 48) == (('B' << 8) | 'M')) { |
| 56 | 21 | bpc->fsize = av_bswap32(state >> 16); | |
| 57 |
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21 | if (bpc->fsize > 17) |
| 58 | 21 | bpc->pc.frame_start_found = 1; | |
| 59 | } | ||
| 60 |
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210 | } else if (bpc->pc.frame_start_found == 2+4+4) { |
| 61 | // unsigned hsize = av_bswap32(state>>32); | ||
| 62 | 21 | unsigned ihsize = av_bswap32(state); | |
| 63 |
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21 | if (ihsize < 12 || ihsize > 200) { |
| 64 | ✗ | bpc->pc.frame_start_found = 0; | |
| 65 | ✗ | continue; | |
| 66 | } | ||
| 67 | 21 | bpc->pc.frame_start_found++; | |
| 68 | 21 | bpc->remaining_size = bpc->fsize + i - 17; | |
| 69 | |||
| 70 |
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21 | if (bpc->pc.index + i > 17) { |
| 71 | 3 | next = i - 17; | |
| 72 | 3 | state = 0; | |
| 73 | 3 | break; | |
| 74 | } else { | ||
| 75 | 18 | bpc->pc.state64 = 0; | |
| 76 | 18 | goto restart; | |
| 77 | } | ||
| 78 |
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189 | } else if (bpc->pc.frame_start_found) |
| 79 | 189 | bpc->pc.frame_start_found++; | |
| 80 | } | ||
| 81 | 48 | bpc->pc.state64 = state; | |
| 82 | } else { | ||
| 83 |
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58 | if (bpc->remaining_size) { |
| 84 | 58 | i = FFMIN(bpc->remaining_size, buf_size); | |
| 85 | 58 | bpc->remaining_size -= i; | |
| 86 |
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58 | if (bpc->remaining_size) |
| 87 | 40 | goto flush; | |
| 88 | |||
| 89 | 18 | bpc->pc.frame_start_found = 0; | |
| 90 | 18 | goto restart; | |
| 91 | } | ||
| 92 | } | ||
| 93 | |||
| 94 | ✗ | flush: | |
| 95 |
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88 | if (ff_combine_frame(&bpc->pc, next, &buf, &buf_size) < 0) |
| 96 | 55 | return buf_size; | |
| 97 | |||
| 98 |
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33 | if (next != END_NOT_FOUND && next < 0) |
| 99 | ✗ | bpc->pc.frame_start_found = FFMAX(bpc->pc.frame_start_found - i - 1, 0); | |
| 100 | else | ||
| 101 | 33 | bpc->pc.frame_start_found = 0; | |
| 102 | |||
| 103 | 33 | *poutbuf = buf; | |
| 104 | 33 | *poutbuf_size = buf_size; | |
| 105 | 33 | return next; | |
| 106 | } | ||
| 107 | |||
| 108 | const AVCodecParser ff_bmp_parser = { | ||
| 109 | .codec_ids = { AV_CODEC_ID_BMP }, | ||
| 110 | .priv_data_size = sizeof(BMPParseContext), | ||
| 111 | .parser_parse = bmp_parse, | ||
| 112 | .parser_close = ff_parse_close, | ||
| 113 | }; | ||
| 114 |