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avcodec/tiff: Refactor TIFF tag related functions to share the code.

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Thilo Borgmann 2013-08-12 19:32:40 +02:00 committed by Michael Niedermayer
parent 4b101ab02e
commit b7ba7cbd6e
5 changed files with 457 additions and 203 deletions
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2
libavcodec/Makefile
View File

@ -426,7 +426,7 @@ OBJS-$(CONFIG_TARGA_Y216_DECODER) += targa_y216dec.o
OBJS-$(CONFIG_THEORA_DECODER) += xiph.o
OBJS-$(CONFIG_THP_DECODER) += mjpegdec.o mjpeg.o
OBJS-$(CONFIG_TIERTEXSEQVIDEO_DECODER) += tiertexseqv.o
OBJS-$(CONFIG_TIFF_DECODER) += tiff.o lzw.o faxcompr.o tiff_data.o
OBJS-$(CONFIG_TIFF_DECODER) += tiff.o lzw.o faxcompr.o tiff_data.o tiff_common.o
OBJS-$(CONFIG_TIFF_ENCODER) += tiffenc.o rle.o lzwenc.o tiff_data.o
OBJS-$(CONFIG_TMV_DECODER) += tmv.o cga_data.o
OBJS-$(CONFIG_TRUEHD_DECODER) += mlpdec.o mlpdsp.o

208
libavcodec/tiff.c
View File

@ -70,38 +70,6 @@ typedef struct TiffContext {
TiffGeoTag *geotags;
} TiffContext;
static unsigned tget_short(GetByteContext *gb, int le)
{
unsigned v = le ? bytestream2_get_le16(gb) : bytestream2_get_be16(gb);
return v;
}
static unsigned tget_long(GetByteContext *gb, int le)
{
unsigned v = le ? bytestream2_get_le32(gb) : bytestream2_get_be32(gb);
return v;
}
static double tget_double(GetByteContext *gb, int le)
{
av_alias64 i = { .u64 = le ? bytestream2_get_le64(gb) : bytestream2_get_be64(gb)};
return i.f64;
}
static unsigned tget(GetByteContext *gb, int type, int le)
{
switch (type) {
case TIFF_BYTE:
return bytestream2_get_byte(gb);
case TIFF_SHORT:
return tget_short(gb, le);
case TIFF_LONG:
return tget_long(gb, le);
default:
return UINT_MAX;
}
}
static void free_geotags(TiffContext *const s)
{
int i;
@ -245,111 +213,13 @@ static char *doubles2str(double *dp, int count, const char *sep)
return ap0;
}
static char *shorts2str(int16_t *sp, int count, const char *sep)
{
int i;
char *ap, *ap0;
uint64_t component_len;
if (!sep) sep = ", ";
component_len = 7LL + strlen(sep);
if (count >= (INT_MAX - 1)/component_len)
return NULL;
ap = av_malloc(component_len * count + 1);
if (!ap)
return NULL;
ap0 = ap;
ap[0] = '\0';
for (i = 0; i < count; i++) {
unsigned l = snprintf(ap, component_len, "%d%s", sp[i], sep);
if (l >= component_len) {
av_free(ap0);
return NULL;
}
ap += l;
}
ap0[strlen(ap0) - strlen(sep)] = '\0';
return ap0;
}
static int add_doubles_metadata(int count,
const char *name, const char *sep,
TiffContext *s, AVFrame *frame)
{
char *ap;
int i;
double *dp;
if (count >= INT_MAX / sizeof(int64_t) || count <= 0)
return AVERROR_INVALIDDATA;
if (bytestream2_get_bytes_left(&s->gb) < count * sizeof(int64_t))
return AVERROR_INVALIDDATA;
dp = av_malloc(count * sizeof(double));
if (!dp)
return AVERROR(ENOMEM);
for (i = 0; i < count; i++)
dp[i] = tget_double(&s->gb, s->le);
ap = doubles2str(dp, count, sep);
av_freep(&dp);
if (!ap)
return AVERROR(ENOMEM);
av_dict_set(avpriv_frame_get_metadatap(frame), name, ap, AV_DICT_DONT_STRDUP_VAL);
return 0;
}
static int add_shorts_metadata(int count, const char *name,
const char *sep, TiffContext *s, AVFrame *frame)
{
char *ap;
int i;
int16_t *sp;
if (count >= INT_MAX / sizeof(int16_t) || count <= 0)
return AVERROR_INVALIDDATA;
if (bytestream2_get_bytes_left(&s->gb) < count * sizeof(int16_t))
return AVERROR_INVALIDDATA;
sp = av_malloc(count * sizeof(int16_t));
if (!sp)
return AVERROR(ENOMEM);
for (i = 0; i < count; i++)
sp[i] = tget_short(&s->gb, s->le);
ap = shorts2str(sp, count, sep);
av_freep(&sp);
if (!ap)
return AVERROR(ENOMEM);
av_dict_set(avpriv_frame_get_metadatap(frame), name, ap, AV_DICT_DONT_STRDUP_VAL);
return 0;
}
static int add_string_metadata(int count, const char *name,
TiffContext *s, AVFrame *frame)
{
char *value;
if (bytestream2_get_bytes_left(&s->gb) < count || count < 0)
return AVERROR_INVALIDDATA;
value = av_malloc(count + 1);
if (!value)
return AVERROR(ENOMEM);
bytestream2_get_bufferu(&s->gb, value, count);
value[count] = 0;
av_dict_set(avpriv_frame_get_metadatap(frame), name, value, AV_DICT_DONT_STRDUP_VAL);
return 0;
}
static int add_metadata(int count, int type,
const char *name, const char *sep, TiffContext *s, AVFrame *frame)
{
switch(type) {
case TIFF_DOUBLE: return add_doubles_metadata(count, name, sep, s, frame);
case TIFF_SHORT : return add_shorts_metadata(count, name, sep, s, frame);
case TIFF_STRING: return add_string_metadata(count, name, s, frame);
case TIFF_DOUBLE: return ff_tadd_doubles_metadata(count, name, sep, &s->gb, s->le, avpriv_frame_get_metadatap(frame));
case TIFF_SHORT : return ff_tadd_shorts_metadata(count, name, sep, &s->gb, s->le, avpriv_frame_get_metadatap(frame));
case TIFF_STRING: return ff_tadd_string_metadata(count, name, &s->gb, s->le, avpriv_frame_get_metadatap(frame));
default : return AVERROR_INVALIDDATA;
};
}
@ -702,14 +572,8 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
uint32_t *pal;
double *dp;
tag = tget_short(&s->gb, s->le);
type = tget_short(&s->gb, s->le);
count = tget_long(&s->gb, s->le);
start = bytestream2_tell(&s->gb) + 4;
if (type == 0 || type >= FF_ARRAY_ELEMS(type_sizes)) {
av_log(s->avctx, AV_LOG_DEBUG, "Unknown tiff type (%u) encountered\n",
type);
ret = ff_tread_tag(&s->gb, s->le, &tag, &type, &count, &start);
if (ret < 0) {
goto end;
}
@ -717,10 +581,10 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
switch (type) {
case TIFF_BYTE:
case TIFF_SHORT:
value = tget(&s->gb, type, s->le);
value = ff_tget(&s->gb, type, s->le);
break;
case TIFF_LONG:
off = tget_long(&s->gb, s->le);
off = ff_tget_long(&s->gb, s->le);
value = off;
break;
case TIFF_STRING:
@ -728,14 +592,12 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
break;
}
default:
off = tget_long(&s->gb, s->le);
off = bytestream2_tell(&s->gb);
value = UINT_MAX;
bytestream2_seek(&s->gb, off, SEEK_SET);
}
} else {
if (type_sizes[type] * count > 4) {
off = tget_long(&s->gb, s->le);
bytestream2_seek(&s->gb, off, SEEK_SET);
off = bytestream2_tell(&s->gb);
}
}
@ -768,7 +630,7 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
if (bytestream2_get_bytes_left(&s->gb) < type_sizes[type] * count)
return AVERROR_INVALIDDATA;
for (i = 0; i < count; i++)
s->bpp += tget(&s->gb, type, s->le);
s->bpp += ff_tget(&s->gb, type, s->le);
break;
default:
s->bpp = -1;
@ -908,7 +770,7 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
for (i = 0; i < count / 3; i++) {
if (k == 2)
pal[i] = 0xFFU << 24;
j = (tget(&s->gb, type, s->le) >> off) << (k * 8);
j = (ff_tget(&s->gb, type, s->le) >> off) << (k * 8);
pal[i] |= j;
}
}
@ -942,7 +804,7 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
case TIFF_GEO_KEY_DIRECTORY:
ADD_METADATA(1, "GeoTIFF_Version", NULL);
ADD_METADATA(2, "GeoTIFF_Key_Revision", ".");
s->geotag_count = tget_short(&s->gb, s->le);
s->geotag_count = ff_tget_short(&s->gb, s->le);
if (s->geotag_count > count / 4 - 1) {
s->geotag_count = count / 4 - 1;
av_log(s->avctx, AV_LOG_WARNING, "GeoTIFF key directory buffer shorter than specified\n");
@ -958,14 +820,14 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
goto end;
}
for (i = 0; i < s->geotag_count; i++) {
s->geotags[i].key = tget_short(&s->gb, s->le);
s->geotags[i].type = tget_short(&s->gb, s->le);
s->geotags[i].count = tget_short(&s->gb, s->le);
s->geotags[i].key = ff_tget_short(&s->gb, s->le);
s->geotags[i].type = ff_tget_short(&s->gb, s->le);
s->geotags[i].count = ff_tget_short(&s->gb, s->le);
if (!s->geotags[i].type)
s->geotags[i].val = get_geokey_val(s->geotags[i].key, tget_short(&s->gb, s->le));
s->geotags[i].val = get_geokey_val(s->geotags[i].key, ff_tget_short(&s->gb, s->le));
else
s->geotags[i].offset = tget_short(&s->gb, s->le);
s->geotags[i].offset = ff_tget_short(&s->gb, s->le);
}
break;
case TIFF_GEO_DOUBLE_PARAMS:
@ -979,7 +841,7 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
goto end;
}
for (i = 0; i < count; i++)
dp[i] = tget_double(&s->gb, s->le);
dp[i] = ff_tget_double(&s->gb, s->le);
for (i = 0; i < s->geotag_count; i++) {
if (s->geotags[i].type == TIFF_GEO_DOUBLE_PARAMS) {
if (s->geotags[i].count == 0
@ -1075,7 +937,7 @@ static int decode_frame(AVCodecContext *avctx,
TiffContext *const s = avctx->priv_data;
AVFrame *const p = data;
unsigned off;
int id, le, ret, plane, planes;
int le, ret, plane, planes;
int i, j, entries, stride;
unsigned soff, ssize;
uint8_t *dst;
@ -1085,15 +947,11 @@ static int decode_frame(AVCodecContext *avctx,
bytestream2_init(&s->gb, avpkt->data, avpkt->size);
// parse image header
if (avpkt->size < 8)
return AVERROR_INVALIDDATA;
id = bytestream2_get_le16u(&s->gb);
if (id == 0x4949)
le = 1;
else if (id == 0x4D4D)
le = 0;
else {
av_log(avctx, AV_LOG_ERROR, "TIFF header not found\n");
if ((ret = ff_tdecode_header(&s->gb, &le, &off))) {
av_log(avctx, AV_LOG_ERROR, "Invalid TIFF header\n");
return ret;
} else if (off >= UINT_MAX - 14 || avpkt->size < off + 14) {
av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n");
return AVERROR_INVALIDDATA;
}
s->le = le;
@ -1104,23 +962,11 @@ static int decode_frame(AVCodecContext *avctx,
s->fill_order = 0;
free_geotags(s);
// As TIFF 6.0 specification puts it "An arbitrary but carefully chosen number
// that further identifies the file as a TIFF file"
if (tget_short(&s->gb, le) != 42) {
av_log(avctx, AV_LOG_ERROR,
"The answer to life, universe and everything is not correct!\n");
return AVERROR_INVALIDDATA;
}
// Reset these offsets so we can tell if they were set this frame
s->stripsizesoff = s->strippos = 0;
/* parse image file directory */
off = tget_long(&s->gb, le);
if (off >= UINT_MAX - 14 || avpkt->size < off + 14) {
av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n");
return AVERROR_INVALIDDATA;
}
bytestream2_seek(&s->gb, off, SEEK_SET);
entries = tget_short(&s->gb, le);
entries = ff_tget_short(&s->gb, le);
if (bytestream2_get_bytes_left(&s->gb) < entries * 12)
return AVERROR_INVALIDDATA;
for (i = 0; i < entries; i++) {
@ -1180,12 +1026,12 @@ static int decode_frame(AVCodecContext *avctx,
dst = p->data[plane];
for (i = 0; i < s->height; i += s->rps) {
if (s->stripsizesoff)
ssize = tget(&stripsizes, s->sstype, s->le);
ssize = ff_tget(&stripsizes, s->sstype, s->le);
else
ssize = s->stripsize;
if (s->strippos)
soff = tget(&stripdata, s->sot, s->le);
soff = ff_tget(&stripdata, s->sot, s->le);
else
soff = s->stripoff;

22
libavcodec/tiff.h
View File

@ -31,6 +31,7 @@
#define AVCODEC_TIFF_H
#include <stdint.h>
#include "tiff_common.h"
/** abridged list of TIFF tags */
enum TiffTags {
@ -97,22 +98,6 @@ enum TiffCompr {
TIFF_DEFLATE = 0x80B2
};
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
};
enum TiffGeoTagKey {
TIFF_GT_MODEL_TYPE_GEOKEY = 1024,
TIFF_GT_RASTER_TYPE_GEOKEY = 1025,
@ -167,11 +152,6 @@ enum TiffGeoTagType {
GEOTIFF_STRING = 34737
};
/** 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
};
typedef struct TiffGeoTag {
enum TiffGeoTagKey key;
enum TiffTags type;

282
libavcodec/tiff_common.c Normal file
View File

@ -0,0 +1,282 @@
/*
* TIFF Common Routines
* Copyright (c) 2013 Thilo Borgmann <thilo.borgmann _at_ googlemail.com>
*
* 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_ googlemail.com>
*/
#include "tiff_common.h"
int ff_tis_ifd(unsigned tag)
{
int i;
for (i = 0; i < FF_ARRAY_ELEMS(ifd_tags); i++) {
if (ifd_tags[i] == tag) {
return i + 1;
}
}
return 0;
}
unsigned ff_tget_short(GetByteContext *gb, int le)
{
unsigned v = le ? bytestream2_get_le16(gb) : bytestream2_get_be16(gb);
return v;
}
unsigned ff_tget_long(GetByteContext *gb, int le)
{
unsigned v = le ? bytestream2_get_le32(gb) : bytestream2_get_be32(gb);
return v;
}
double ff_tget_double(GetByteContext *gb, int le)
{
av_alias64 i = { .u64 = le ? bytestream2_get_le64(gb) : bytestream2_get_be64(gb)};
return i.f64;
}
unsigned ff_tget(GetByteContext *gb, int type, int le)
{
switch (type) {
case TIFF_BYTE:
return bytestream2_get_byte(gb);
case TIFF_SHORT:
return ff_tget_short(gb, le);
case TIFF_LONG:
return ff_tget_long(gb, le);
default:
return UINT_MAX;
}
}
int ff_tadd_rational_metadata(int count, const char *name, const char *sep,
GetByteContext *gb, int le, AVDictionary **metadata)
{
AVBPrint bp;
char *ap;
int32_t nom, denom;
int i;
if (count >= INT_MAX / sizeof(int64_t) || count <= 0)
return AVERROR_INVALIDDATA;
if (bytestream2_get_bytes_left(gb) < count * sizeof(int64_t))
return AVERROR_INVALIDDATA;
if (!sep) sep = ", ";
av_bprint_init(&bp, 10 * count, AV_BPRINT_SIZE_AUTOMATIC);
for (i = 0; i < count; i++) {
nom = ff_tget_long(gb, le);
denom = ff_tget_long(gb, le);
av_bprintf(&bp, "%s%i:%i", (i ? sep : ""), nom, denom);
}
if ((i = av_bprint_finalize(&bp, &ap))) {
return i;
}
if (!ap) {
return AVERROR(ENOMEM);
}
av_dict_set(metadata, name, ap, AV_DICT_DONT_STRDUP_VAL);
return 0;
}
int ff_tadd_long_metadata(int count, const char *name, const char *sep,
GetByteContext *gb, int le, AVDictionary **metadata)
{
AVBPrint bp;
char *ap;
int i;
if (count >= INT_MAX / sizeof(int32_t) || count <= 0)
return AVERROR_INVALIDDATA;
if (bytestream2_get_bytes_left(gb) < count * sizeof(int32_t))
return AVERROR_INVALIDDATA;
if (!sep) sep = ", ";
av_bprint_init(&bp, 10 * count, AV_BPRINT_SIZE_AUTOMATIC);
for (i = 0; i < count; i++) {
av_bprintf(&bp, "%s%i", (i ? sep : ""), ff_tget_long(gb, le));
}
if ((i = av_bprint_finalize(&bp, &ap))) {
return i;
}
if (!ap) {
return AVERROR(ENOMEM);
}
av_dict_set(metadata, name, ap, AV_DICT_DONT_STRDUP_VAL);
return 0;
}
int ff_tadd_doubles_metadata(int count, const char *name, const char *sep,
GetByteContext *gb, int le, AVDictionary **metadata)
{
AVBPrint bp;
char *ap;
int i;
if (count >= INT_MAX / sizeof(int64_t) || count <= 0)
return AVERROR_INVALIDDATA;
if (bytestream2_get_bytes_left(gb) < count * sizeof(int64_t))
return AVERROR_INVALIDDATA;
if (!sep) sep = ", ";
av_bprint_init(&bp, 10 * count, AV_BPRINT_SIZE_AUTOMATIC);
for (i = 0; i < count; i++) {
av_bprintf(&bp, "%s%f", (i ? sep : ""), ff_tget_double(gb, le));
}
if ((i = av_bprint_finalize(&bp, &ap))) {
return i;
}
if (!ap) {
return AVERROR(ENOMEM);
}
av_dict_set(metadata, name, ap, AV_DICT_DONT_STRDUP_VAL);
return 0;
}
int ff_tadd_shorts_metadata(int count, const char *name, const char *sep,
GetByteContext *gb, int le, AVDictionary **metadata)
{
AVBPrint bp;
char *ap;
int i;
if (count >= INT_MAX / sizeof(int16_t) || count <= 0)
return AVERROR_INVALIDDATA;
if (bytestream2_get_bytes_left(gb) < count * sizeof(int16_t))
return AVERROR_INVALIDDATA;
if (!sep) sep = ", ";
av_bprint_init(&bp, 10 * count, AV_BPRINT_SIZE_AUTOMATIC);
for (i = 0; i < count; i++) {
av_bprintf(&bp, "%s%i", (i ? sep : ""), ff_tget_short(gb, le));
}
if ((i = av_bprint_finalize(&bp, &ap))) {
return i;
}
if (!ap) {
return AVERROR(ENOMEM);
}
av_dict_set(metadata, name, ap, AV_DICT_DONT_STRDUP_VAL);
return 0;
}
int ff_tadd_string_metadata(int count, const char *name,
GetByteContext *gb, int le, AVDictionary **metadata)
{
char *value;
if (bytestream2_get_bytes_left(gb) < count || count < 0)
return AVERROR_INVALIDDATA;
value = av_malloc(count + 1);
if (!value)
return AVERROR(ENOMEM);
bytestream2_get_bufferu(gb, value, count);
value[count] = 0;
av_dict_set(metadata, name, value, AV_DICT_DONT_STRDUP_VAL);
return 0;
}
int ff_tdecode_header(GetByteContext *gb, int *le, int *ifd_offset)
{
if (bytestream2_get_bytes_left(gb) < 8) {
return AVERROR_INVALIDDATA;
}
*le = bytestream2_get_le16u(gb);
if (*le == AV_RB16("II")) {
*le = 1;
} else if (*le == AV_RB16("MM")) {
*le = 0;
} else {
return AVERROR_INVALIDDATA;
}
if (ff_tget_short(gb, *le) != 42) {
return AVERROR_INVALIDDATA;
}
*ifd_offset = ff_tget_long(gb, *le);
return 0;
}
int ff_tread_tag(GetByteContext *gb, int le, unsigned *tag, unsigned *type,
unsigned *count, int *next)
{
int ifd_tag;
int valid_type;
*tag = ff_tget_short(gb, le);
*type = ff_tget_short(gb, le);
*count = ff_tget_long (gb, le);
ifd_tag = ff_tis_ifd(*tag);
valid_type = *type != 0 && *type < FF_ARRAY_ELEMS(type_sizes);
*next = bytestream2_tell(gb) + 4;
// check for valid type
if (!valid_type) {
return AVERROR_INVALIDDATA;
}
// seek to offset if this is an IFD-tag or
// if count values do not fit into the offset value
if (ifd_tag || (*count > 4 || !(type_sizes[*type] * (*count) <= 4 || *type == TIFF_STRING))) {
bytestream2_seek(gb, ff_tget_long (gb, le), SEEK_SET);
}
return 0;
}

146
libavcodec/tiff_common.h Normal file
View File

@ -0,0 +1,146 @@
/*
* TIFF Common Routines
* Copyright (c) 2013 Thilo Borgmann <thilo.borgmann _at_ googlemail.com>
*
* 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_ googlemail.com>
*/
#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 endianess. */
unsigned ff_tget_short(GetByteContext *gb, int le);
/** Reads a long from the bytestream using given endianess. */
unsigned ff_tget_long(GetByteContext *gb, int le);
/** Reads a double from the bytestream using given endianess. */
double ff_tget_double(GetByteContext *gb, int le);
/** Reads a byte from the bytestream using given endianess. */
unsigned ff_tget(GetByteContext *gb, int type, int le);
/** Returns an allocated string containing count
* rational values using the given seperator.
*/
char *ff_trationals2str(int *rp, int count, const char *sep);
/** Returns an allocated string containing count
* long values using the given seperator.
*/
char *ff_tlongs2str(int32_t *lp, int count, const char *sep);
/** Returns an allocated string containing count
* double values using the given seperator.
*/
char *ff_tdoubles2str(double *dp, int count, const char *sep);
/** Returns an allocated string containing count
* short values using the given seperator.
*/
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, 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 endianess 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 */