blob: 03558c31a39291cc3d563df2798ea01c695e674c
1 | /* |
2 | * TIFF Common Routines |
3 | * Copyright (c) 2013 Thilo Borgmann <thilo.borgmann _at_ mail.de> |
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 | * TIFF Common Routines |
25 | * @author Thilo Borgmann <thilo.borgmann _at_ mail.de> |
26 | */ |
27 | |
28 | #ifndef AVCODEC_TIFF_COMMON_H |
29 | #define AVCODEC_TIFF_COMMON_H |
30 | |
31 | #include "avcodec.h" |
32 | #include "tiff.h" |
33 | #include "bytestream.h" |
34 | #include "libavutil/bprint.h" |
35 | |
36 | /** data type identifiers for TIFF tags */ |
37 | enum TiffTypes { |
38 | TIFF_BYTE = 1, |
39 | TIFF_STRING, |
40 | TIFF_SHORT, |
41 | TIFF_LONG, |
42 | TIFF_RATIONAL, |
43 | TIFF_SBYTE, |
44 | TIFF_UNDEFINED, |
45 | TIFF_SSHORT, |
46 | TIFF_SLONG, |
47 | TIFF_SRATIONAL, |
48 | TIFF_FLOAT, |
49 | TIFF_DOUBLE, |
50 | TIFF_IFD |
51 | }; |
52 | |
53 | /** sizes of various TIFF field types (string size = 100)*/ |
54 | static const uint8_t type_sizes[14] = { |
55 | 0, 1, 100, 2, 4, 8, 1, 1, 2, 4, 8, 4, 8, 4 |
56 | }; |
57 | |
58 | static const uint16_t ifd_tags[] = { |
59 | 0x8769, // EXIF IFD |
60 | 0x8825, // GPS IFD |
61 | 0xA005 // Interoperability IFD |
62 | }; |
63 | |
64 | |
65 | /** Returns a value > 0 if the tag is a known IFD-tag. |
66 | * The return value is the array index + 1 within ifd_tags[]. |
67 | */ |
68 | int ff_tis_ifd(unsigned tag); |
69 | |
70 | /** Reads a short from the bytestream using given endianness. */ |
71 | unsigned ff_tget_short(GetByteContext *gb, int le); |
72 | |
73 | /** Reads a long from the bytestream using given endianness. */ |
74 | unsigned ff_tget_long(GetByteContext *gb, int le); |
75 | |
76 | /** Reads a double from the bytestream using given endianness. */ |
77 | double ff_tget_double(GetByteContext *gb, int le); |
78 | |
79 | /** Reads a byte from the bytestream using given endianness. */ |
80 | unsigned ff_tget(GetByteContext *gb, int type, int le); |
81 | |
82 | /** Returns an allocated string containing count |
83 | * rational values using the given separator. |
84 | */ |
85 | char *ff_trationals2str(int *rp, int count, const char *sep); |
86 | |
87 | /** Returns an allocated string containing count |
88 | * long values using the given separator. |
89 | */ |
90 | char *ff_tlongs2str(int32_t *lp, int count, const char *sep); |
91 | |
92 | /** Returns an allocated string containing count |
93 | * double values using the given separator. |
94 | */ |
95 | char *ff_tdoubles2str(double *dp, int count, const char *sep); |
96 | |
97 | /** Returns an allocated string containing count |
98 | * short values using the given separator. |
99 | */ |
100 | char *ff_tshorts2str(int16_t *sp, int count, const char *sep); |
101 | |
102 | /** Adds count rationals converted to a string |
103 | * into the metadata dictionary. |
104 | */ |
105 | int ff_tadd_rational_metadata(int count, const char *name, const char *sep, |
106 | GetByteContext *gb, int le, AVDictionary **metadata); |
107 | |
108 | /** Adds count longs converted to a string |
109 | * into the metadata dictionary. |
110 | */ |
111 | int ff_tadd_long_metadata(int count, const char *name, const char *sep, |
112 | GetByteContext *gb, int le, AVDictionary **metadata); |
113 | |
114 | /** Adds count doubles converted to a string |
115 | * into the metadata dictionary. |
116 | */ |
117 | int ff_tadd_doubles_metadata(int count, const char *name, const char *sep, |
118 | GetByteContext *gb, int le, AVDictionary **metadata); |
119 | |
120 | /** Adds count shorts converted to a string |
121 | * into the metadata dictionary. |
122 | */ |
123 | int ff_tadd_shorts_metadata(int count, const char *name, const char *sep, |
124 | GetByteContext *gb, int le, int is_signed, AVDictionary **metadata); |
125 | |
126 | /** Adds count bytes converted to a string |
127 | * into the metadata dictionary. |
128 | */ |
129 | int ff_tadd_bytes_metadata(int count, const char *name, const char *sep, |
130 | GetByteContext *gb, int le, int is_signed, AVDictionary **metadata); |
131 | |
132 | /** Adds a string of count characters |
133 | * into the metadata dictionary. |
134 | */ |
135 | int ff_tadd_string_metadata(int count, const char *name, |
136 | GetByteContext *gb, int le, AVDictionary **metadata); |
137 | |
138 | /** Decodes a TIFF header from the input bytestream |
139 | * and sets the endianness in *le and the offset to |
140 | * the first IFD in *ifd_offset accordingly. |
141 | */ |
142 | int ff_tdecode_header(GetByteContext *gb, int *le, int *ifd_offset); |
143 | |
144 | /** Reads the first 3 fields of a TIFF tag, which are |
145 | * the tag id, the tag type and the count of values for that tag. |
146 | * Afterwards the bytestream is located at the first value to read and |
147 | * *next holds the bytestream offset of the following tag. |
148 | */ |
149 | int ff_tread_tag(GetByteContext *gb, int le, unsigned *tag, unsigned *type, |
150 | unsigned *count, int *next); |
151 | |
152 | #endif /* AVCODEC_TIFF_COMMON_H */ |
153 |