blob: 5ac9ca9d14b185cd11173079e63b21e7687742d9
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]->codecpar->width = t1<<3; |
69 | *got_width = 1; |
70 | } |
71 | if (get_height && t2) |
72 | avctx->streams[0]->codecpar->height = t2<<4; |
73 | } else if (datatype == 5) { |
74 | if (filetype) { |
75 | avctx->streams[0]->codecpar->width = (filetype == 1 ? t1 : filetype) << 4; |
76 | *got_width = 1; |
77 | } |
78 | if (get_height && t2) |
79 | avctx->streams[0]->codecpar->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 | } |
105 |