| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * DPX parser | ||
| 3 | * Copyright (c) 2013 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 | * DPX parser | ||
| 25 | */ | ||
| 26 | |||
| 27 | #include "libavutil/bswap.h" | ||
| 28 | #include "libavutil/common.h" | ||
| 29 | |||
| 30 | #include "parser.h" | ||
| 31 | |||
| 32 | typedef struct DPXParseContext { | ||
| 33 | ParseContext pc; | ||
| 34 | uint32_t index; | ||
| 35 | uint32_t fsize; | ||
| 36 | uint32_t remaining_size; | ||
| 37 | int is_be; | ||
| 38 | } DPXParseContext; | ||
| 39 | |||
| 40 | 744 | static int dpx_parse(AVCodecParserContext *s, AVCodecContext *avctx, | |
| 41 | const uint8_t **poutbuf, int *poutbuf_size, | ||
| 42 | const uint8_t *buf, int buf_size) | ||
| 43 | { | ||
| 44 | 744 | DPXParseContext *d = s->priv_data; | |
| 45 | 744 | uint32_t state = d->pc.state; | |
| 46 | 744 | int next = END_NOT_FOUND; | |
| 47 | 744 | int i = 0; | |
| 48 | |||
| 49 | 744 | s->pict_type = AV_PICTURE_TYPE_I; | |
| 50 | |||
| 51 | 744 | *poutbuf_size = 0; | |
| 52 |
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744 | if (buf_size == 0) |
| 53 | 6 | next = 0; | |
| 54 | |||
| 55 |
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744 | if (!d->pc.frame_start_found) { |
| 56 |
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27 | for (; i < buf_size; i++) { |
| 57 | 24 | state = (state << 8) | buf[i]; | |
| 58 |
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24 | if (state == MKBETAG('S','D','P','X') || |
| 59 | state == MKTAG('S','D','P','X')) { | ||
| 60 | 6 | d->pc.frame_start_found = 1; | |
| 61 | 6 | d->is_be = state == MKBETAG('S','D','P','X'); | |
| 62 | 6 | d->index = 0; | |
| 63 | 6 | break; | |
| 64 | } | ||
| 65 | } | ||
| 66 | 9 | d->pc.state = state; | |
| 67 | } else { | ||
| 68 |
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735 | if (d->remaining_size) { |
| 69 | 540 | i = FFMIN(d->remaining_size, buf_size); | |
| 70 | 540 | d->remaining_size -= i; | |
| 71 |
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540 | if (d->remaining_size) |
| 72 | 534 | goto flush; | |
| 73 | } | ||
| 74 | } | ||
| 75 | |||
| 76 |
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786747 | for (; d->pc.frame_start_found && i < buf_size; i++) { |
| 77 | 786546 | d->pc.state = (d->pc.state << 8) | buf[i]; | |
| 78 | 786546 | d->index++; | |
| 79 |
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786546 | if (d->index == 17) { |
| 80 |
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6 | d->fsize = d->is_be ? d->pc.state : av_bswap32(d->pc.state); |
| 81 |
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6 | if (d->fsize <= 1664) { |
| 82 | ✗ | d->pc.frame_start_found = 0; | |
| 83 | ✗ | goto flush; | |
| 84 | } | ||
| 85 |
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6 | if (d->fsize > buf_size - i + 19) |
| 86 | 6 | d->remaining_size = d->fsize - buf_size + i - 19; | |
| 87 | else | ||
| 88 | ✗ | i += d->fsize - 19; | |
| 89 | |||
| 90 | 6 | break; | |
| 91 |
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786540 | } else if (d->index > 17) { |
| 92 |
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786444 | if (d->pc.state == MKBETAG('S','D','P','X') || |
| 93 |
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786444 | d->pc.state == MKTAG('S','D','P','X')) { |
| 94 | 3 | next = i - 3; | |
| 95 | 3 | break; | |
| 96 | } | ||
| 97 | } | ||
| 98 | } | ||
| 99 | |||
| 100 | 201 | flush: | |
| 101 |
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744 | if (ff_combine_frame(&d->pc, next, &buf, &buf_size) < 0) |
| 102 | 735 | return buf_size; | |
| 103 | |||
| 104 | 9 | d->pc.frame_start_found = 0; | |
| 105 | |||
| 106 | 9 | *poutbuf = buf; | |
| 107 | 9 | *poutbuf_size = buf_size; | |
| 108 | 9 | return next; | |
| 109 | } | ||
| 110 | |||
| 111 | const AVCodecParser ff_dpx_parser = { | ||
| 112 | .codec_ids = { AV_CODEC_ID_DPX }, | ||
| 113 | .priv_data_size = sizeof(DPXParseContext), | ||
| 114 | .parser_parse = dpx_parse, | ||
| 115 | .parser_close = ff_parse_close, | ||
| 116 | }; | ||
| 117 |