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tag: exif: Adds flash tags mapping

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Adds a mapping for GST_TAG_CAPTURING_FLASH_FIRED/_MODE to
the exif Flash tag.

Tests included.
This commit is contained in:
Thiago Santos 2010-08-20 15:59:22 -03:00
parent ac361dcc3a
commit 9c5f791a34
2 changed files with 106 additions and 0 deletions
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83
gst-libs/gst/tag/gstexiftag.c
View file

@ -229,6 +229,7 @@ EXIF_SERIALIZATION_DESERIALIZATION_FUNC (aperture_value);
EXIF_SERIALIZATION_DESERIALIZATION_FUNC (contrast);
EXIF_SERIALIZATION_DESERIALIZATION_FUNC (exposure_program);
EXIF_SERIALIZATION_DESERIALIZATION_FUNC (exposure_mode);
EXIF_SERIALIZATION_DESERIALIZATION_FUNC (flash);
EXIF_SERIALIZATION_DESERIALIZATION_FUNC (gain_control);
EXIF_SERIALIZATION_DESERIALIZATION_FUNC (geo_coordinate);
EXIF_SERIALIZATION_DESERIALIZATION_FUNC (geo_direction);
@ -277,6 +278,7 @@ EXIF_DESERIALIZATION_FUNC (add_to_pending_tags);
#define EXIF_TAG_DATE_TIME_DIGITIZED 0x9004
#define EXIF_TAG_SHUTTER_SPEED_VALUE 0x9201
#define EXIF_TAG_APERTURE_VALUE 0x9202
#define EXIF_TAG_FLASH 0x9209
#define EXIF_TAG_FOCAL_LENGTH 0x920A
#define EXIF_TAG_MAKER_NOTE 0x927C
#define EXIF_TAG_EXPOSURE_MODE 0xA402
@ -350,6 +352,8 @@ static const GstExifTagMatch tag_map_exif[] = {
{GST_TAG_CAPTURING_FOCAL_RATIO, EXIF_TAG_APERTURE_VALUE, EXIF_TYPE_RATIONAL,
0,
serialize_aperture_value, deserialize_aperture_value},
{GST_TAG_CAPTURING_FLASH_FIRED, EXIF_TAG_FLASH, EXIF_TYPE_SHORT, 0,
serialize_flash, deserialize_flash},
{GST_TAG_CAPTURING_FOCAL_LENGTH, EXIF_TAG_FOCAL_LENGTH, EXIF_TYPE_RATIONAL, 0,
NULL, NULL},
{GST_TAG_APPLICATION_DATA, EXIF_TAG_MAKER_NOTE, EXIF_TYPE_UNDEFINED, 0, NULL,
@ -2319,6 +2323,85 @@ deserialize_sensitivity_type (GstExifReader * exif_reader,
return 0;
}
static void
serialize_flash (GstExifWriter * writer, const GstTagList * taglist,
const GstExifTagMatch * exiftag)
{
gboolean flash_fired;
const gchar *flash_mode;
guint16 tagvalue = 0;
if (!gst_tag_list_get_boolean_index (taglist, exiftag->gst_tag, 0,
&flash_fired)) {
GST_WARNING ("Failed to get flash fired from from tag list");
return;
}
if (flash_fired)
tagvalue = 1;
if (gst_tag_list_peek_string_index (taglist, GST_TAG_CAPTURING_FLASH_MODE, 0,
&flash_mode)) {
guint16 mode = 0;
if (strcmp (flash_mode, "auto") == 0) {
mode = 3;
} else if (strcmp (flash_mode, "always") == 0) {
mode = 1;
} else if (strcmp (flash_mode, "never") == 0) {
mode = 2;
}
tagvalue = tagvalue | (mode << 3);
} else {
GST_DEBUG ("flash-mode not available");
}
gst_exif_writer_write_short_tag (writer, exiftag->exif_tag, tagvalue);
}
static gint
deserialize_flash (GstExifReader * exif_reader,
GstByteReader * reader, const GstExifTagMatch * exiftag,
GstExifTagData * tagdata)
{
guint16 value = 0;
guint mode = 0;
const gchar *mode_str = NULL;
GST_LOG ("Starting to parse %s tag in exif 0x%x", exiftag->gst_tag,
exiftag->exif_tag);
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);
}
/* check flash fired */
if (value & 0x1) {
gst_tag_list_add (exif_reader->taglist, GST_TAG_MERGE_REPLACE,
GST_TAG_CAPTURING_FLASH_FIRED, TRUE, NULL);
} else {
gst_tag_list_add (exif_reader->taglist, GST_TAG_MERGE_REPLACE,
GST_TAG_CAPTURING_FLASH_FIRED, FALSE, NULL);
}
mode = (value >> 3) & 0x3;
if (mode == 1) {
mode_str = "always";
} else if (mode == 2) {
mode_str = "never";
} else if (mode == 3) {
mode_str = "auto";
}
if (mode_str)
gst_tag_list_add (exif_reader->taglist, GST_TAG_MERGE_REPLACE,
GST_TAG_CAPTURING_FLASH_MODE, mode_str, NULL);
return 0;
}
static gint
deserialize_add_to_pending_tags (GstExifReader * exif_reader,
GstByteReader * reader, const GstExifTagMatch * exiftag,

23
tests/check/libs/tag.c
View file

@ -1245,6 +1245,7 @@ GST_START_TEST (test_exif_tags_serialization_deserialization)
GstDateTime *datetime = NULL;
GstBuffer *buf = NULL;
gint i;
GstTagList *taglist;
gst_tag_register_musicbrainz_tags ();
@ -1493,6 +1494,28 @@ GST_START_TEST (test_exif_tags_serialization_deserialization)
do_simple_exif_tag_serialization_deserialization
(GST_TAG_CAPTURING_SHUTTER_SPEED, &value);
g_value_unset (&value);
/* flash is a little bit more tricky, because 2 tags are merged into 1 in
* exif */
taglist = gst_tag_list_new_full (GST_TAG_CAPTURING_FLASH_FIRED, FALSE,
GST_TAG_CAPTURING_FLASH_MODE, "auto", NULL);
do_exif_tag_serialization_deserialization (taglist);
gst_tag_list_free (taglist);
taglist = gst_tag_list_new_full (GST_TAG_CAPTURING_FLASH_FIRED, TRUE,
GST_TAG_CAPTURING_FLASH_MODE, "auto", NULL);
do_exif_tag_serialization_deserialization (taglist);
gst_tag_list_free (taglist);
taglist = gst_tag_list_new_full (GST_TAG_CAPTURING_FLASH_FIRED, FALSE,
GST_TAG_CAPTURING_FLASH_MODE, "never", NULL);
do_exif_tag_serialization_deserialization (taglist);
gst_tag_list_free (taglist);
taglist = gst_tag_list_new_full (GST_TAG_CAPTURING_FLASH_FIRED, TRUE,
GST_TAG_CAPTURING_FLASH_MODE, "always", NULL);
do_exif_tag_serialization_deserialization (taglist);
gst_tag_list_free (taglist);
}
GST_END_TEST;