| 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 */ |