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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 */ |