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