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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * BMP parser |
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| 3 | * Copyright (c) 2012 Paul B Mahol |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | /** |
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| 23 | * @file |
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| 24 | * BMP parser |
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| 25 | */ |
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| 26 | |||
| 27 | #include "libavutil/bswap.h" |
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| 28 | #include "parser.h" |
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| 29 | |||
| 30 | typedef struct BMPParseContext { |
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| 31 | ParseContext pc; |
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| 32 | uint32_t fsize; |
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| 33 | uint32_t remaining_size; |
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| 34 | } BMPParseContext; |
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| 35 | |||
| 36 | static int bmp_parse(AVCodecParserContext *s, AVCodecContext *avctx, |
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| 37 | const uint8_t **poutbuf, int *poutbuf_size, |
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| 38 | const uint8_t *buf, int buf_size) |
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| 39 | { |
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| 40 | BMPParseContext *bpc = s->priv_data; |
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| 41 | uint64_t state = bpc->pc.state64; |
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| 42 | int next = END_NOT_FOUND; |
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| 43 | int i = 0; |
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| 44 | |||
| 45 | s->pict_type = AV_PICTURE_TYPE_NONE; |
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| 46 | |||
| 47 | *poutbuf_size = 0; |
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| 48 | if (buf_size == 0) |
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| 49 | return 0; |
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| 50 | |||
| 51 | if (!bpc->pc.frame_start_found) { |
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| 52 | for (; i < buf_size; i++) { |
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| 53 | state = (state << 8) | buf[i]; |
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| 54 | if ((state >> 48) == (('B' << 8) | 'M')) { |
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| 55 | bpc->fsize = av_bswap32(state >> 16); |
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| 56 | bpc->pc.frame_start_found = 1; |
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| 57 | if (bpc->fsize > buf_size - i + 7) |
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| 58 | bpc->remaining_size = bpc->fsize - buf_size + i - 7; |
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| 59 | else |
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| 60 | next = bpc->fsize + i - 7; |
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| 61 | break; |
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| 62 | } |
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| 63 | } |
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| 64 | bpc->pc.state64 = state; |
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| 65 | } else { |
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| 66 | if (bpc->remaining_size) { |
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| 67 | i = FFMIN(bpc->remaining_size, buf_size); |
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| 68 | bpc->remaining_size -= i; |
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| 69 | if (bpc->remaining_size) |
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| 70 | goto flush; |
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| 71 | next = i; |
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| 72 | } |
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| 73 | } |
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| 74 | |||
| 75 | flush: |
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| 76 | if (ff_combine_frame(&bpc->pc, next, &buf, &buf_size) < 0) |
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| 77 | return buf_size; |
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| 78 | |||
| 79 | bpc->pc.frame_start_found = 0; |
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| 80 | |||
| 81 | *poutbuf = buf; |
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| 82 | *poutbuf_size = buf_size; |
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| 83 | return next; |
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| 84 | } |
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| 85 | |||
| 86 | AVCodecParser ff_bmp_parser = { |
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| 87 | .codec_ids = { AV_CODEC_ID_BMP }, |
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| 88 | .priv_data_size = sizeof(BMPParseContext), |
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| 89 | .parser_parse = bmp_parse, |
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| 90 | .parser_close = ff_parse_close, |
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| 91 | }; |