| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * WebP parser | ||
| 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 | /** | ||
| 22 | * @file | ||
| 23 | * WebP parser | ||
| 24 | */ | ||
| 25 | |||
| 26 | #include "libavutil/bswap.h" | ||
| 27 | #include "libavutil/common.h" | ||
| 28 | |||
| 29 | #include "parser.h" | ||
| 30 | |||
| 31 | typedef struct WebPParseContext { | ||
| 32 | ParseContext pc; | ||
| 33 | uint32_t fsize; | ||
| 34 | uint32_t remaining_size; | ||
| 35 | } WebPParseContext; | ||
| 36 | |||
| 37 | 45 | static int webp_parse(AVCodecParserContext *s, AVCodecContext *avctx, | |
| 38 | const uint8_t **poutbuf, int *poutbuf_size, | ||
| 39 | const uint8_t *buf, int buf_size) | ||
| 40 | { | ||
| 41 | 45 | WebPParseContext *ctx = s->priv_data; | |
| 42 | 45 | uint64_t state = ctx->pc.state64; | |
| 43 | 45 | int next = END_NOT_FOUND; | |
| 44 | 45 | int i = 0; | |
| 45 | |||
| 46 | 45 | *poutbuf = NULL; | |
| 47 | 45 | *poutbuf_size = 0; | |
| 48 | |||
| 49 | 16 | restart: | |
| 50 |
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61 | if (ctx->pc.frame_start_found <= 8) { |
| 51 |
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152 | for (; i < buf_size; i++) { |
| 52 | 128 | state = (state << 8) | buf[i]; | |
| 53 |
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128 | if (ctx->pc.frame_start_found == 0) { |
| 54 |
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64 | if ((state >> 32) == MKBETAG('R', 'I', 'F', 'F')) { |
| 55 | 8 | ctx->fsize = av_bswap32(state); | |
| 56 |
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8 | if (ctx->fsize > 15 && ctx->fsize <= UINT32_MAX - 10) { |
| 57 | 8 | ctx->pc.frame_start_found = 1; | |
| 58 | 8 | ctx->fsize += 8; | |
| 59 | } | ||
| 60 | } | ||
| 61 |
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64 | } else if (ctx->pc.frame_start_found == 8) { |
| 62 |
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8 | if ((state >> 32) != MKBETAG('W', 'E', 'B', 'P')) { |
| 63 | ✗ | ctx->pc.frame_start_found = 0; | |
| 64 | ✗ | continue; | |
| 65 | } | ||
| 66 | 8 | ctx->pc.frame_start_found++; | |
| 67 | 8 | ctx->remaining_size = ctx->fsize + i - 15; | |
| 68 |
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8 | if (ctx->pc.index + i > 15) { |
| 69 | ✗ | next = i - 15; | |
| 70 | ✗ | state = 0; | |
| 71 | ✗ | break; | |
| 72 | } else { | ||
| 73 | 8 | ctx->pc.state64 = 0; | |
| 74 | 8 | goto restart; | |
| 75 | } | ||
| 76 |
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56 | } else if (ctx->pc.frame_start_found) |
| 77 | 56 | ctx->pc.frame_start_found++; | |
| 78 | } | ||
| 79 | 24 | ctx->pc.state64 = state; | |
| 80 | } else { | ||
| 81 |
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29 | if (ctx->remaining_size) { |
| 82 | 29 | i = FFMIN(ctx->remaining_size, buf_size); | |
| 83 | 29 | ctx->remaining_size -= i; | |
| 84 |
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29 | if (ctx->remaining_size) |
| 85 | 21 | goto flush; | |
| 86 | |||
| 87 | 8 | ctx->pc.frame_start_found = 0; | |
| 88 | 8 | goto restart; | |
| 89 | } | ||
| 90 | } | ||
| 91 | |||
| 92 | ✗ | flush: | |
| 93 |
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45 | if (ff_combine_frame(&ctx->pc, next, &buf, &buf_size) < 0) |
| 94 | 29 | return buf_size; | |
| 95 | |||
| 96 |
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16 | if (next != END_NOT_FOUND && next < 0) |
| 97 | ✗ | ctx->pc.frame_start_found = FFMAX(ctx->pc.frame_start_found - i - 1, 0); | |
| 98 | else | ||
| 99 | 16 | ctx->pc.frame_start_found = 0; | |
| 100 | |||
| 101 | 16 | *poutbuf = buf; | |
| 102 | 16 | *poutbuf_size = buf_size; | |
| 103 | |||
| 104 | 16 | return next; | |
| 105 | } | ||
| 106 | |||
| 107 | const AVCodecParser ff_webp_parser = { | ||
| 108 | .codec_ids = { AV_CODEC_ID_WEBP }, | ||
| 109 | .priv_data_size = sizeof(WebPParseContext), | ||
| 110 | .parser_parse = webp_parse, | ||
| 111 | .parser_close = ff_parse_close, | ||
| 112 | }; | ||
| 113 |