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