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2ba45a60 DM |
1 | /* |
2 | * SAUCE header parser | |
3 | * Copyright (c) 2010 Peter Ross <pross@xvid.org> | |
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 | * SAUCE header parser | |
25 | */ | |
26 | ||
27 | #include "libavutil/intreadwrite.h" | |
28 | #include "libavutil/dict.h" | |
29 | #include "avformat.h" | |
30 | #include "sauce.h" | |
31 | ||
32 | int ff_sauce_read(AVFormatContext *avctx, uint64_t *fsize, int *got_width, int get_height) | |
33 | { | |
34 | AVIOContext *pb = avctx->pb; | |
35 | char buf[36]; | |
36 | int datatype, filetype, t1, t2, nb_comments; | |
37 | uint64_t start_pos = avio_size(pb) - 128; | |
38 | ||
39 | avio_seek(pb, start_pos, SEEK_SET); | |
40 | if (avio_read(pb, buf, 7) != 7) | |
41 | return -1; | |
42 | if (memcmp(buf, "SAUCE00", 7)) | |
43 | return -1; | |
44 | ||
45 | #define GET_SAUCE_META(name,size) \ | |
46 | if (avio_read(pb, buf, size) == size && buf[0]) { \ | |
47 | buf[size] = 0; \ | |
48 | av_dict_set(&avctx->metadata, name, buf, 0); \ | |
49 | } | |
50 | ||
51 | GET_SAUCE_META("title", 35) | |
52 | GET_SAUCE_META("artist", 20) | |
53 | GET_SAUCE_META("publisher", 20) | |
54 | GET_SAUCE_META("date", 8) | |
55 | avio_skip(pb, 4); | |
56 | datatype = avio_r8(pb); | |
57 | filetype = avio_r8(pb); | |
58 | t1 = avio_rl16(pb); | |
59 | t2 = avio_rl16(pb); | |
60 | nb_comments = avio_r8(pb); | |
61 | avio_skip(pb, 1); /* flags */ | |
62 | avio_skip(pb, 4); | |
63 | GET_SAUCE_META("encoder", 22); | |
64 | ||
65 | if (got_width && datatype && filetype) { | |
66 | if ((datatype == 1 && filetype <=2) || (datatype == 5 && filetype == 255) || datatype == 6) { | |
67 | if (t1) { | |
68 | avctx->streams[0]->codec->width = t1<<3; | |
69 | *got_width = 1; | |
70 | } | |
71 | if (get_height && t2) | |
72 | avctx->streams[0]->codec->height = t2<<4; | |
73 | } else if (datatype == 5) { | |
74 | if (filetype) { | |
75 | avctx->streams[0]->codec->width = (filetype == 1 ? t1 : filetype) << 4; | |
76 | *got_width = 1; | |
77 | } | |
78 | if (get_height && t2) | |
79 | avctx->streams[0]->codec->height = t2<<4; | |
80 | } | |
81 | } | |
82 | ||
83 | *fsize -= 128; | |
84 | ||
85 | if (nb_comments > 0) { | |
86 | avio_seek(pb, start_pos - 64*nb_comments - 5, SEEK_SET); | |
87 | if (avio_read(pb, buf, 5) == 5 && !memcmp(buf, "COMNT", 5)) { | |
88 | int i; | |
89 | char *str = av_malloc(65*nb_comments + 1); | |
90 | *fsize -= 64*nb_comments + 5; | |
91 | if (!str) | |
92 | return 0; | |
93 | for (i = 0; i < nb_comments; i++) { | |
94 | if (avio_read(pb, str + 65*i, 64) != 64) | |
95 | break; | |
96 | str[65*i + 64] = '\n'; | |
97 | } | |
98 | str[65*i] = 0; | |
99 | av_dict_set(&avctx->metadata, "comment", str, AV_DICT_DONT_STRDUP_VAL); | |
100 | } | |
101 | } | |
102 | ||
103 | return 0; | |
104 | } |