153 lines
4.5 KiB
C
Executable File
153 lines
4.5 KiB
C
Executable File
/*
|
|
* EXIF metadata parser
|
|
* 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
|
|
* EXIF metadata parser
|
|
* @author Thilo Borgmann <thilo.borgmann _at_ mail.de>
|
|
*/
|
|
|
|
#include "exif.h"
|
|
|
|
|
|
static const char *exif_get_tag_name(uint16_t id)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < FF_ARRAY_ELEMS(tag_list); i++) {
|
|
if (tag_list[i].id == id)
|
|
return tag_list[i].name;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
|
|
static int exif_add_metadata(void *logctx, int count, int type,
|
|
const char *name, const char *sep,
|
|
GetByteContext *gb, int le,
|
|
AVDictionary **metadata)
|
|
{
|
|
switch(type) {
|
|
case 0:
|
|
av_log(logctx, AV_LOG_WARNING,
|
|
"Invalid TIFF tag type 0 found for %s with size %d\n",
|
|
name, count);
|
|
return 0;
|
|
case TIFF_DOUBLE : return ff_tadd_doubles_metadata(count, name, sep, gb, le, metadata);
|
|
case TIFF_SSHORT : return ff_tadd_shorts_metadata(count, name, sep, gb, le, 1, metadata);
|
|
case TIFF_SHORT : return ff_tadd_shorts_metadata(count, name, sep, gb, le, 0, metadata);
|
|
case TIFF_SBYTE : return ff_tadd_bytes_metadata(count, name, sep, gb, le, 1, metadata);
|
|
case TIFF_BYTE :
|
|
case TIFF_UNDEFINED: return ff_tadd_bytes_metadata(count, name, sep, gb, le, 0, metadata);
|
|
case TIFF_STRING : return ff_tadd_string_metadata(count, name, gb, le, metadata);
|
|
case TIFF_SRATIONAL:
|
|
case TIFF_RATIONAL : return ff_tadd_rational_metadata(count, name, sep, gb, le, metadata);
|
|
case TIFF_SLONG :
|
|
case TIFF_LONG : return ff_tadd_long_metadata(count, name, sep, gb, le, metadata);
|
|
default:
|
|
avpriv_request_sample(logctx, "TIFF tag type (%u)", type);
|
|
return 0;
|
|
};
|
|
}
|
|
|
|
|
|
static int exif_decode_tag(void *logctx, GetByteContext *gbytes, int le,
|
|
int depth, AVDictionary **metadata)
|
|
{
|
|
int ret, cur_pos;
|
|
unsigned id, count;
|
|
enum TiffTypes type;
|
|
|
|
if (depth > 2) {
|
|
return 0;
|
|
}
|
|
|
|
ff_tread_tag(gbytes, le, &id, &type, &count, &cur_pos);
|
|
|
|
if (!bytestream2_tell(gbytes)) {
|
|
bytestream2_seek(gbytes, cur_pos, SEEK_SET);
|
|
return 0;
|
|
}
|
|
|
|
// read count values and add it metadata
|
|
// store metadata or proceed with next IFD
|
|
ret = ff_tis_ifd(id);
|
|
if (ret) {
|
|
ret = ff_exif_decode_ifd(logctx, gbytes, le, depth + 1, metadata);
|
|
} else {
|
|
const char *name = exif_get_tag_name(id);
|
|
char *use_name = (char*) name;
|
|
|
|
if (!use_name) {
|
|
use_name = av_malloc(7);
|
|
if (!use_name) {
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
snprintf(use_name, 7, "0x%04X", id);
|
|
}
|
|
|
|
ret = exif_add_metadata(logctx, count, type, use_name, NULL,
|
|
gbytes, le, metadata);
|
|
|
|
if (!name) {
|
|
av_freep(&use_name);
|
|
}
|
|
}
|
|
|
|
bytestream2_seek(gbytes, cur_pos, SEEK_SET);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
int ff_exif_decode_ifd(void *logctx, GetByteContext *gbytes,
|
|
int le, int depth, AVDictionary **metadata)
|
|
{
|
|
int i, ret;
|
|
int entries;
|
|
|
|
entries = ff_tget_short(gbytes, le);
|
|
|
|
if (bytestream2_get_bytes_left(gbytes) < entries * 12) {
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
for (i = 0; i < entries; i++) {
|
|
if ((ret = exif_decode_tag(logctx, gbytes, le, depth, metadata)) < 0) {
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
// return next IDF offset or 0x000000000 or a value < 0 for failure
|
|
return ff_tget_long(gbytes, le);
|
|
}
|
|
|
|
int avpriv_exif_decode_ifd(void *logctx, const uint8_t *buf, int size,
|
|
int le, int depth, AVDictionary **metadata)
|
|
{
|
|
GetByteContext gb;
|
|
|
|
bytestream2_init(&gb, buf, size);
|
|
|
|
return ff_exif_decode_ifd(logctx, &gb, le, depth, metadata);
|
|
}
|