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tag: exif: Adds mapping for GST_TAG_IMAGE_ORIENTATION

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Adds GST_TAG_IMAGE_ORIENTATION to the exif helper lib mapped tags.
Tests included.
This commit is contained in:
Thiago Santos 2010-06-16 11:19:37 -03:00
parent 7379202cca
commit e327be5a96
6 changed files with 183 additions and 1 deletions
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2
gst-libs/gst/tag/Makefile.am
View file

@ -8,7 +8,7 @@ lib_LTLIBRARIES = libgsttag-@GST_MAJORMINOR@.la
libgsttag_@GST_MAJORMINOR@_la_SOURCES = \
gstvorbistag.c gstid3tag.c gstxmptag.c gstexiftag.c \
lang.c tags.c gsttagdemux.c
lang.c tags.c gsttagdemux.c gsttageditingprivate.c
libgsttag_@GST_MAJORMINOR@_la_CFLAGS = $(GST_PLUGINS_BASE_CFLAGS) $(GST_BASE_CFLAGS) $(GST_CFLAGS)
libgsttag_@GST_MAJORMINOR@_la_LIBADD = $(GST_BASE_LIBS) $(GST_LIBS)
libgsttag_@GST_MAJORMINOR@_la_LDFLAGS = $(GST_LIB_LDFLAGS) $(GST_ALL_LDFLAGS) $(GST_LT_LDFLAGS)

83
gst-libs/gst/tag/gstexiftag.c
View file

@ -129,6 +129,12 @@ struct _GstExifReader
gint byte_order;
};
static void serialize_orientation (GstExifWriter * writer,
const GstTagList * taglist, const GstExifTagMatch * exiftag);
static gint deserialize_orientation (GstExifReader * exif_reader,
GstByteReader * reader, const GstExifTagMatch * exiftag,
GstExifTagData * tagdata);
static void serialize_geo_coordinate (GstExifWriter * writer,
const GstTagList * taglist, const GstExifTagMatch * exiftag);
static gint deserialize_geo_coordinate (GstExifReader * exif_reader,
@ -170,6 +176,8 @@ static const GstExifTagMatch tag_map_ifd0[] = {
{GST_TAG_DESCRIPTION, 0x10E, EXIF_TYPE_ASCII, 0, NULL, NULL},
{GST_TAG_DEVICE_MANUFACTURER, 0x10F, EXIF_TYPE_ASCII, 0, NULL, NULL},
{GST_TAG_DEVICE_MODEL, 0x110, EXIF_TYPE_ASCII, 0, NULL, NULL},
{GST_TAG_IMAGE_ORIENTATION, 0x112, EXIF_TYPE_SHORT, 0, serialize_orientation,
deserialize_orientation},
{GST_TAG_ARTIST, 0x13B, EXIF_TYPE_ASCII, 0, NULL, NULL},
{GST_TAG_COPYRIGHT, 0x8298, EXIF_TYPE_ASCII, 0, NULL, NULL},
{NULL, EXIF_GPS_IFD_TAG, EXIF_TYPE_LONG, 0, NULL, NULL},
@ -369,6 +377,22 @@ gst_exif_writer_write_byte_tag (GstExifWriter * writer, guint16 tag,
1, offset, TRUE);
}
static void
gst_exif_writer_write_short_tag (GstExifWriter * writer, guint16 tag,
guint16 value)
{
guint32 offset = 0;
if (writer->byte_order == G_LITTLE_ENDIAN) {
GST_WRITE_UINT16_LE ((guint8 *) & offset, value);
} else {
GST_WRITE_UINT16_BE ((guint8 *) & offset, value);
}
gst_exif_writer_write_tag_header (writer, tag, EXIF_TYPE_SHORT,
1, offset, TRUE);
}
static void
write_exif_ascii_tag (GstExifWriter * writer, guint16 tag, const gchar * str)
{
@ -1007,6 +1031,65 @@ byte_reader_fail:
}
/* special serialization functions */
static void
serialize_orientation (GstExifWriter * writer, const GstTagList * taglist,
const GstExifTagMatch * exiftag)
{
gchar *str = NULL;
gint exif_value;
if (!gst_tag_list_get_string_index (taglist, GST_TAG_IMAGE_ORIENTATION, 0,
&str)) {
GST_WARNING ("No image orientation tag present in taglist");
return;
}
exif_value = gst_tag_image_orientation_to_exif_value (str);
if (exif_value == -1) {
GST_WARNING ("Invalid image orientation value: %s", str);
g_free (str);
return;
}
g_free (str);
gst_exif_writer_write_short_tag (writer, exiftag->exif_tag, exif_value);
}
static gint
deserialize_orientation (GstExifReader * exif_reader,
GstByteReader * reader, const GstExifTagMatch * exiftag,
GstExifTagData * tagdata)
{
gint ret = 1;
const gchar *str = NULL;
gint value;
GST_LOG ("Starting to parse %s tag in exif 0x%x", exiftag->gst_tag,
exiftag->exif_tag);
/* validate tag */
if (tagdata->tag_type != EXIF_TYPE_SHORT || tagdata->count != 1) {
GST_WARNING ("Orientation tag has unexpected type/count");
return ret;
}
if (exif_reader->byte_order == G_LITTLE_ENDIAN) {
value = GST_READ_UINT16_LE (tagdata->offset_as_data);
} else {
value = GST_READ_UINT16_BE (tagdata->offset_as_data);
}
str = gst_tag_image_orientation_from_exif_value (value);
if (str == NULL) {
GST_WARNING ("Invalid value for exif orientation tag: %d", value);
return ret;
}
gst_tag_list_add (exif_reader->taglist, GST_TAG_MERGE_REPLACE,
exiftag->gst_tag, str, NULL);
return ret;
}
static void
serialize_geo_coordinate (GstExifWriter * writer, const GstTagList * taglist,
const GstExifTagMatch * exiftag)

76
gst-libs/gst/tag/gsttageditingprivate.c Normal file
View file

@ -0,0 +1,76 @@
/* GStreamer
* Copyright (C) 2010 Thiago Santos <thiago.sousa.santos@collabora.co.uk>
*
* 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 "gsttageditingprivate.h"
#include <string.h>
gint
gst_tag_image_orientation_to_exif_value (const gchar * str)
{
if (str == NULL)
goto end;
if (strcmp (str, "rotate-0") == 0)
return 1;
else if (strcmp (str, "flip-rotate-0") == 0)
return 2;
else if (strcmp (str, "rotate-180") == 0)
return 3;
else if (strcmp (str, "flip-rotate-180") == 0)
return 4;
else if (strcmp (str, "flip-rotate-270") == 0)
return 5;
else if (strcmp (str, "rotate-90") == 0)
return 6;
else if (strcmp (str, "flip-rotate-90") == 0)
return 7;
else if (strcmp (str, "rotate-270") == 0)
return 8;
end:
GST_WARNING ("Invalid image orientation tag: %d", str);
return -1;
}
const gchar *
gst_tag_image_orientation_from_exif_value (gint value)
{
switch (value) {
case 1:
return "rotate-0";
case 2:
return "flip-rotate-0";
case 3:
return "rotate-180";
case 4:
return "flip-rotate-180";
case 5:
return "flip-rotate-270";
case 6:
return "rotate-90";
case 7:
return "flip-rotate-90";
case 8:
return "rotate-270";
default:
GST_WARNING ("Invalid tiff orientation tag value: %d", value);
return NULL;
}
}

3
gst-libs/gst/tag/gsttageditingprivate.h
View file

@ -35,6 +35,9 @@ struct _GstTagEntryMatch {
GType gst_vorbis_tag_get_type (void);
gint gst_tag_image_orientation_to_exif_value (const gchar * str);
const gchar * gst_tag_image_orientation_from_exif_value (gint value);
G_END_DECLS

18
tests/check/libs/tag.c
View file

@ -1126,6 +1126,24 @@ GST_START_TEST (test_exif_tags_serialization_deserialization)
do_exif_tag_serialization_deserialization (GST_TAG_COPYRIGHT, &value);
g_value_set_static_string (&value, "ty");
do_exif_tag_serialization_deserialization (GST_TAG_ARTIST, &value);
/* image orientation tests */
g_value_set_static_string (&value, "rotate-0");
do_exif_tag_serialization_deserialization (GST_TAG_IMAGE_ORIENTATION, &value);
g_value_set_static_string (&value, "flip-rotate-0");
do_exif_tag_serialization_deserialization (GST_TAG_IMAGE_ORIENTATION, &value);
g_value_set_static_string (&value, "rotate-180");
do_exif_tag_serialization_deserialization (GST_TAG_IMAGE_ORIENTATION, &value);
g_value_set_static_string (&value, "flip-rotate-180");
do_exif_tag_serialization_deserialization (GST_TAG_IMAGE_ORIENTATION, &value);
g_value_set_static_string (&value, "flip-rotate-270");
do_exif_tag_serialization_deserialization (GST_TAG_IMAGE_ORIENTATION, &value);
g_value_set_static_string (&value, "rotate-90");
do_exif_tag_serialization_deserialization (GST_TAG_IMAGE_ORIENTATION, &value);
g_value_set_static_string (&value, "flip-rotate-90");
do_exif_tag_serialization_deserialization (GST_TAG_IMAGE_ORIENTATION, &value);
g_value_set_static_string (&value, "rotate-270");
do_exif_tag_serialization_deserialization (GST_TAG_IMAGE_ORIENTATION, &value);
g_value_unset (&value);
g_value_init (&value, G_TYPE_DOUBLE);

2
win32/common/libgsttag.def
View file

@ -13,6 +13,8 @@ EXPORTS
gst_tag_id3_genre_count
gst_tag_id3_genre_get
gst_tag_image_data_to_image_buffer
gst_tag_image_orientation_from_exif_value
gst_tag_image_orientation_to_exif_value
gst_tag_image_type_get_type
gst_tag_list_add_id3_image
gst_tag_list_from_exif_buffer