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| 4349 | Serge | 1 | /* |
| 2 | * TIFF Common Routines |
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| 3 | * Copyright (c) 2013 Thilo Borgmann |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | /** |
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| 23 | * @file |
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| 24 | * TIFF Common Routines |
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| 25 | * @author Thilo Borgmann |
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| 26 | */ |
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| 27 | |||
| 28 | #ifndef AVCODEC_TIFF_COMMON_H |
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| 29 | #define AVCODEC_TIFF_COMMON_H |
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| 30 | |||
| 31 | #include "avcodec.h" |
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| 32 | #include "tiff.h" |
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| 33 | #include "bytestream.h" |
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| 34 | #include "libavutil/bprint.h" |
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| 35 | |||
| 36 | /** data type identifiers for TIFF tags */ |
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| 37 | enum TiffTypes { |
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| 38 | TIFF_BYTE = 1, |
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| 39 | TIFF_STRING, |
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| 40 | TIFF_SHORT, |
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| 41 | TIFF_LONG, |
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| 42 | TIFF_RATIONAL, |
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| 43 | TIFF_SBYTE, |
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| 44 | TIFF_UNDEFINED, |
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| 45 | TIFF_SSHORT, |
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| 46 | TIFF_SLONG, |
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| 47 | TIFF_SRATIONAL, |
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| 48 | TIFF_FLOAT, |
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| 49 | TIFF_DOUBLE, |
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| 50 | TIFF_IFD |
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| 51 | }; |
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| 52 | |||
| 53 | /** sizes of various TIFF field types (string size = 100)*/ |
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| 54 | static const uint8_t type_sizes[14] = { |
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| 55 | 0, 1, 100, 2, 4, 8, 1, 1, 2, 4, 8, 4, 8, 4 |
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| 56 | }; |
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| 57 | |||
| 58 | static const uint16_t ifd_tags[] = { |
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| 59 | 0x8769, // EXIF IFD |
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| 60 | 0x8825, // GPS IFD |
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| 61 | 0xA005 // Interoperability IFD |
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| 62 | }; |
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| 63 | |||
| 64 | |||
| 65 | /** Returns a value > 0 if the tag is a known IFD-tag. |
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| 66 | * The return value is the array index + 1 within ifd_tags[]. |
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| 67 | */ |
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| 68 | int ff_tis_ifd(unsigned tag); |
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| 69 | |||
| 70 | /** Reads a short from the bytestream using given endianess. */ |
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| 71 | unsigned ff_tget_short(GetByteContext *gb, int le); |
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| 72 | |||
| 73 | /** Reads a long from the bytestream using given endianess. */ |
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| 74 | unsigned ff_tget_long(GetByteContext *gb, int le); |
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| 75 | |||
| 76 | /** Reads a double from the bytestream using given endianess. */ |
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| 77 | double ff_tget_double(GetByteContext *gb, int le); |
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| 78 | |||
| 79 | /** Reads a byte from the bytestream using given endianess. */ |
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| 80 | unsigned ff_tget(GetByteContext *gb, int type, int le); |
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| 81 | |||
| 82 | /** Returns an allocated string containing count |
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| 83 | * rational values using the given separator. |
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| 84 | */ |
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| 85 | char *ff_trationals2str(int *rp, int count, const char *sep); |
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| 86 | |||
| 87 | /** Returns an allocated string containing count |
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| 88 | * long values using the given separator. |
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| 89 | */ |
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| 90 | char *ff_tlongs2str(int32_t *lp, int count, const char *sep); |
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| 91 | |||
| 92 | /** Returns an allocated string containing count |
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| 93 | * double values using the given separator. |
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| 94 | */ |
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| 95 | char *ff_tdoubles2str(double *dp, int count, const char *sep); |
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| 96 | |||
| 97 | /** Returns an allocated string containing count |
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| 98 | * short values using the given separator. |
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| 99 | */ |
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| 100 | char *ff_tshorts2str(int16_t *sp, int count, const char *sep); |
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| 101 | |||
| 102 | /** Adds count rationals converted to a string |
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| 103 | * into the metadata dictionary. |
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| 104 | */ |
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| 105 | int ff_tadd_rational_metadata(int count, const char *name, const char *sep, |
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| 106 | GetByteContext *gb, int le, AVDictionary **metadata); |
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| 107 | |||
| 108 | /** Adds count longs converted to a string |
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| 109 | * into the metadata dictionary. |
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| 110 | */ |
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| 111 | int ff_tadd_long_metadata(int count, const char *name, const char *sep, |
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| 112 | GetByteContext *gb, int le, AVDictionary **metadata); |
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| 113 | |||
| 114 | /** Adds count doubles converted to a string |
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| 115 | * into the metadata dictionary. |
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| 116 | */ |
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| 117 | int ff_tadd_doubles_metadata(int count, const char *name, const char *sep, |
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| 118 | GetByteContext *gb, int le, AVDictionary **metadata); |
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| 119 | |||
| 120 | /** Adds count shorts converted to a string |
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| 121 | * into the metadata dictionary. |
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| 122 | */ |
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| 123 | int ff_tadd_shorts_metadata(int count, const char *name, const char *sep, |
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| 124 | GetByteContext *gb, int le, AVDictionary **metadata); |
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| 125 | |||
| 126 | /** Adds count bytes converted to a string |
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| 127 | * into the metadata dictionary. |
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| 128 | */ |
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| 129 | int ff_tadd_bytes_metadata(int count, const char *name, const char *sep, |
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| 130 | GetByteContext *gb, int le, AVDictionary **metadata); |
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| 131 | |||
| 132 | /** Adds a string of count characters |
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| 133 | * into the metadata dictionary. |
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| 134 | */ |
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| 135 | int ff_tadd_string_metadata(int count, const char *name, |
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| 136 | GetByteContext *gb, int le, AVDictionary **metadata); |
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| 137 | |||
| 138 | /** Decodes a TIFF header from the input bytestream |
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| 139 | * and sets the endianess in *le and the offset to |
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| 140 | * the first IFD in *ifd_offset accordingly. |
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| 141 | */ |
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| 142 | int ff_tdecode_header(GetByteContext *gb, int *le, int *ifd_offset); |
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| 143 | |||
| 144 | /** Reads the first 3 fields of a TIFF tag, which are |
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| 145 | * the tag id, the tag type and the count of values for that tag. |
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| 146 | * Afterwards the bytestream is located at the first value to read and |
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| 147 | * *next holds the bytestream offset of the following tag. |
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| 148 | */ |
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| 149 | int ff_tread_tag(GetByteContext *gb, int le, unsigned *tag, unsigned *type, |
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| 150 | unsigned *count, int *next); |
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| 151 | |||
| 152 | #endif /* AVCODEC_TIFF_COMMON_H */ |