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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6148 | serge | 1 | /* |
| 2 | * DPX parser |
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| 3 | * Copyright (c) 2013 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 | * DPX 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 DPXParseContext { |
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| 31 | ParseContext pc; |
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| 32 | uint32_t index; |
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| 33 | uint32_t fsize; |
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| 34 | uint32_t remaining_size; |
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| 35 | int is_be; |
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| 36 | } DPXParseContext; |
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| 37 | |||
| 38 | static int dpx_parse(AVCodecParserContext *s, AVCodecContext *avctx, |
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| 39 | const uint8_t **poutbuf, int *poutbuf_size, |
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| 40 | const uint8_t *buf, int buf_size) |
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| 41 | { |
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| 42 | DPXParseContext *d = s->priv_data; |
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| 43 | uint32_t state = d->pc.state; |
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| 44 | int next = END_NOT_FOUND; |
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| 45 | int i = 0; |
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| 46 | |||
| 47 | s->pict_type = AV_PICTURE_TYPE_I; |
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| 48 | |||
| 49 | *poutbuf_size = 0; |
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| 50 | if (buf_size == 0) |
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| 51 | return 0; |
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| 52 | |||
| 53 | if (!d->pc.frame_start_found) { |
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| 54 | for (; i < buf_size; i++) { |
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| 55 | state = (state << 8) | buf[i]; |
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| 56 | if (state == MKBETAG('S','D','P','X') || |
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| 57 | state == MKTAG('S','D','P','X')) { |
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| 58 | d->pc.frame_start_found = 1; |
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| 59 | d->is_be = state == MKBETAG('S','D','P','X'); |
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| 60 | break; |
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| 61 | } |
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| 62 | } |
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| 63 | d->pc.state = state; |
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| 64 | } else { |
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| 65 | if (d->remaining_size) { |
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| 66 | i = FFMIN(d->remaining_size, buf_size); |
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| 67 | d->remaining_size -= i; |
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| 68 | if (d->remaining_size) |
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| 69 | goto flush; |
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| 70 | next = i; |
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| 71 | } |
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| 72 | } |
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| 73 | |||
| 74 | for (;d->pc.frame_start_found && i < buf_size; i++) { |
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| 75 | d->pc.state = (d->pc.state << 8) | buf[i]; |
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| 76 | if (d->index == 16) { |
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| 77 | d->fsize = d->is_be ? d->pc.state : av_bswap32(d->pc.state); |
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| 78 | if (d->fsize <= 1664) { |
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| 79 | d->index = d->pc.frame_start_found = 0; |
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| 80 | goto flush; |
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| 81 | } |
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| 82 | d->index = 0; |
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| 83 | if (d->fsize > buf_size - i + 19) |
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| 84 | d->remaining_size = d->fsize - buf_size + i - 19; |
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| 85 | else |
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| 86 | next = d->fsize + i - 19; |
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| 87 | break; |
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| 88 | } |
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| 89 | d->index++; |
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| 90 | } |
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| 91 | |||
| 92 | flush: |
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| 93 | if (ff_combine_frame(&d->pc, next, &buf, &buf_size) < 0) |
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| 94 | return buf_size; |
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| 95 | |||
| 96 | d->index = d->pc.frame_start_found = 0; |
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| 97 | |||
| 98 | *poutbuf = buf; |
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| 99 | *poutbuf_size = buf_size; |
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| 100 | return next; |
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| 101 | } |
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| 102 | |||
| 103 | AVCodecParser ff_dpx_parser = { |
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| 104 | .codec_ids = { AV_CODEC_ID_DPX }, |
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| 105 | .priv_data_size = sizeof(DPXParseContext), |
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| 106 | .parser_parse = dpx_parse, |
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| 107 | .parser_close = ff_parse_close, |
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| 108 | }; |