gstreamer/ext/metadata/metadataparse.c
Edgard Lima f17824d0d1 Added support for PNG/XMP. Indentation. And fixed pull mode to parse the file.
Original commit message from CVS:
Added support for PNG/XMP. Indentation. And fixed pull mode to parse the file.
2007-11-02 16:50:42 +00:00

213 lines
5.7 KiB
C

/*
* GStreamer
* Copyright 2007 Edgard Lima <edgard.lima@indt.org.br>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Alternatively, the contents of this file may be used under the
* GNU Lesser General Public License Version 2.1 (the "LGPL"), in
* which case the following provisions apply instead of the ones
* mentioned above:
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "metadataparse.h"
/*
*static declarations
*/
static int
metadataparse_parse_none (ParseData * parse_data, const guint8 * buf,
guint32 * bufsize, guint8 ** next_start, guint32 * next_size);
/*
* extern implementation
*/
void
metadataparse_init (ParseData * parse_data)
{
parse_data->state = STATE_NULL;
parse_data->img_type = IMG_NONE;
parse_data->option = PARSE_OPT_ALL;
parse_data->adpt_exif = NULL;
parse_data->adpt_iptc = NULL;
parse_data->adpt_xmp = NULL;
}
/*
* offset: number of bytes to jump (just a hint to jump a chunk)
* size: number of bytes to read on next call (just a hint to get all chunk)
* return:
* -1 -> error
* 0 -> done
* 1 -> need more data
*/
int
metadataparse_parse (ParseData * parse_data, const guint8 * buf,
guint32 bufsize, guint32 * next_offset, guint32 * next_size)
{
int ret = 0;
guint8 *next_start = (guint8 *) buf;
if (parse_data->state == STATE_NULL) {
ret =
metadataparse_parse_none (parse_data, buf, &bufsize, &next_start,
next_size);
if (ret == 0)
parse_data->state = STATE_READING;
else
goto done;
}
switch (parse_data->img_type) {
case IMG_JPEG:
ret =
metadataparse_jpeg_parse (&parse_data->format_data.jpeg,
(guint8 *) buf, &bufsize, &next_start, next_size);
break;
case IMG_PNG:
ret =
metadataparse_png_parse (&parse_data->format_data.png,
(guint8 *) buf, &bufsize, &next_start, next_size);
break;
default:
/* unexpected */
ret = -1;
goto done;
break;
}
*next_offset = next_start - buf;
done:
if (ret == 0) {
parse_data->state = STATE_DONE;
}
return ret;
}
void
metadataparse_dispose (ParseData * parse_data)
{
switch (parse_data->img_type) {
case IMG_JPEG:
metadataparse_jpeg_dispose (&parse_data->format_data.jpeg);
break;
case IMG_PNG:
metadataparse_png_dispose (&parse_data->format_data.png);
break;
}
if (parse_data->adpt_xmp) {
gst_object_unref (parse_data->adpt_xmp);
parse_data->adpt_xmp = NULL;
}
if (parse_data->adpt_iptc) {
gst_object_unref (parse_data->adpt_iptc);
parse_data->adpt_iptc = NULL;
}
if (parse_data->adpt_exif) {
gst_object_unref (parse_data->adpt_exif);
parse_data->adpt_exif = NULL;
}
}
/*
* static implementation
*/
/* find image type */
static int
metadataparse_parse_none (ParseData * parse_data, const guint8 * buf,
guint32 * bufsize, guint8 ** next_start, guint32 * next_size)
{
int ret = -1;
GstAdapter **adpt_exif = NULL;
GstAdapter **adpt_iptc = NULL;
GstAdapter **adpt_xmp = NULL;
*next_start = buf;
parse_data->img_type = IMG_NONE;
if (*bufsize < 3) {
*next_size = 3;
ret = 1;
goto done;
}
if (parse_data->option & PARSE_OPT_EXIF)
adpt_exif = &parse_data->adpt_exif;
if (parse_data->option & PARSE_OPT_IPTC)
adpt_iptc = &parse_data->adpt_iptc;
if (parse_data->option & PARSE_OPT_XMP)
adpt_xmp = &parse_data->adpt_xmp;
if (buf[0] == 0xFF && buf[1] == 0xD8 && buf[2] == 0xFF) {
metadataparse_jpeg_init (&parse_data->format_data.jpeg, adpt_exif,
adpt_iptc, adpt_xmp);
ret = 0;
parse_data->img_type = IMG_JPEG;
goto done;
}
if (*bufsize < 8) {
*next_size = 8;
ret = 1;
goto done;
}
if (buf[0] == 0x89 && buf[1] == 0x50 && buf[2] == 0x4E && buf[3] == 0x47 &&
buf[4] == 0x0D && buf[5] == 0x0A && buf[6] == 0x1A && buf[7] == 0x0A) {
metadataparse_png_init (&parse_data->format_data.png, adpt_exif,
adpt_iptc, adpt_xmp);
ret = 0;
parse_data->img_type = IMG_PNG;
goto done;
}
done:
return ret;
}