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Diffstat (limited to 'libavcodec/tiff_common.h')
| -rw-r--r-- | libavcodec/tiff_common.h | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/libavcodec/tiff_common.h b/libavcodec/tiff_common.h new file mode 100644 index 0000000000..03558c31a3 --- /dev/null +++ b/libavcodec/tiff_common.h @@ -0,0 +1,152 @@ +/* + * TIFF Common Routines + * Copyright (c) 2013 Thilo Borgmann <thilo.borgmann _at_ mail.de> + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * TIFF Common Routines + * @author Thilo Borgmann <thilo.borgmann _at_ mail.de> + */ + +#ifndef AVCODEC_TIFF_COMMON_H +#define AVCODEC_TIFF_COMMON_H + +#include "avcodec.h" +#include "tiff.h" +#include "bytestream.h" +#include "libavutil/bprint.h" + +/** data type identifiers for TIFF tags */ +enum TiffTypes { + TIFF_BYTE = 1, + TIFF_STRING, + TIFF_SHORT, + TIFF_LONG, + TIFF_RATIONAL, + TIFF_SBYTE, + TIFF_UNDEFINED, + TIFF_SSHORT, + TIFF_SLONG, + TIFF_SRATIONAL, + TIFF_FLOAT, + TIFF_DOUBLE, + TIFF_IFD +}; + +/** sizes of various TIFF field types (string size = 100)*/ +static const uint8_t type_sizes[14] = { + 0, 1, 100, 2, 4, 8, 1, 1, 2, 4, 8, 4, 8, 4 +}; + +static const uint16_t ifd_tags[] = { + 0x8769, // EXIF IFD + 0x8825, // GPS IFD + 0xA005 // Interoperability IFD +}; + + +/** Returns a value > 0 if the tag is a known IFD-tag. + * The return value is the array index + 1 within ifd_tags[]. + */ +int ff_tis_ifd(unsigned tag); + +/** Reads a short from the bytestream using given endianness. */ +unsigned ff_tget_short(GetByteContext *gb, int le); + +/** Reads a long from the bytestream using given endianness. */ +unsigned ff_tget_long(GetByteContext *gb, int le); + +/** Reads a double from the bytestream using given endianness. */ +double ff_tget_double(GetByteContext *gb, int le); + +/** Reads a byte from the bytestream using given endianness. */ +unsigned ff_tget(GetByteContext *gb, int type, int le); + +/** Returns an allocated string containing count + * rational values using the given separator. + */ +char *ff_trationals2str(int *rp, int count, const char *sep); + +/** Returns an allocated string containing count + * long values using the given separator. + */ +char *ff_tlongs2str(int32_t *lp, int count, const char *sep); + +/** Returns an allocated string containing count + * double values using the given separator. + */ +char *ff_tdoubles2str(double *dp, int count, const char *sep); + +/** Returns an allocated string containing count + * short values using the given separator. + */ +char *ff_tshorts2str(int16_t *sp, int count, const char *sep); + +/** Adds count rationals converted to a string + * into the metadata dictionary. + */ +int ff_tadd_rational_metadata(int count, const char *name, const char *sep, + GetByteContext *gb, int le, AVDictionary **metadata); + +/** Adds count longs converted to a string + * into the metadata dictionary. + */ +int ff_tadd_long_metadata(int count, const char *name, const char *sep, + GetByteContext *gb, int le, AVDictionary **metadata); + +/** Adds count doubles converted to a string + * into the metadata dictionary. + */ +int ff_tadd_doubles_metadata(int count, const char *name, const char *sep, + GetByteContext *gb, int le, AVDictionary **metadata); + +/** Adds count shorts converted to a string + * into the metadata dictionary. + */ +int ff_tadd_shorts_metadata(int count, const char *name, const char *sep, + GetByteContext *gb, int le, int is_signed, AVDictionary **metadata); + +/** Adds count bytes converted to a string + * into the metadata dictionary. + */ +int ff_tadd_bytes_metadata(int count, const char *name, const char *sep, + GetByteContext *gb, int le, int is_signed, AVDictionary **metadata); + +/** Adds a string of count characters + * into the metadata dictionary. + */ +int ff_tadd_string_metadata(int count, const char *name, + GetByteContext *gb, int le, AVDictionary **metadata); + +/** Decodes a TIFF header from the input bytestream + * and sets the endianness in *le and the offset to + * the first IFD in *ifd_offset accordingly. + */ +int ff_tdecode_header(GetByteContext *gb, int *le, int *ifd_offset); + +/** Reads the first 3 fields of a TIFF tag, which are + * the tag id, the tag type and the count of values for that tag. + * Afterwards the bytestream is located at the first value to read and + * *next holds the bytestream offset of the following tag. + */ +int ff_tread_tag(GetByteContext *gb, int le, unsigned *tag, unsigned *type, + unsigned *count, int *next); + +#endif /* AVCODEC_TIFF_COMMON_H */ |