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tag: exif: Adds mapping for GST_TAG_CAPTURING_EXPOSURE_COMPENSATION

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Adds mapping for GST_TAG_CAPTURING_EXPOSURE_COMPENSATION for exif
library.

Includes unit tests.
This commit is contained in:
Thiago Santos 2011-04-13 23:16:02 -03:00
parent 4d4aade47b
commit dae1c37dfe
2 changed files with 55 additions and 0 deletions
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45
gst-libs/gst/tag/gstexiftag.c
View file

@ -301,6 +301,7 @@ 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_EXPOSURE_BIAS 0x9204
#define EXIF_TAG_METERING_MODE 0x9207
#define EXIF_TAG_FLASH 0x9209
#define EXIF_TAG_FOCAL_LENGTH 0x920A
@ -388,6 +389,8 @@ 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_EXPOSURE_COMPENSATION, EXIF_TAG_EXPOSURE_BIAS,
EXIF_TYPE_SRATIONAL, 0, NULL, NULL},
{GST_TAG_CAPTURING_METERING_MODE, EXIF_TAG_METERING_MODE, EXIF_TYPE_SHORT, 0,
serialize_metering_mode, deserialize_metering_mode},
{GST_TAG_CAPTURING_FLASH_FIRED, EXIF_TAG_FLASH, EXIF_TYPE_SHORT, 0,
@ -920,6 +923,41 @@ write_exif_rational_tag_from_taglist (GstExifWriter * writer,
}
}
static void
write_exif_signed_rational_tag_from_taglist (GstExifWriter * writer,
const GstTagList * taglist, const GstExifTagMatch * exiftag)
{
const GValue *value;
gdouble num = 0;
gint tag_size = gst_tag_list_get_tag_size (taglist, exiftag->gst_tag);
if (tag_size != 1) {
GST_WARNING ("Only the first item in the taglist will be serialized");
return;
}
value = gst_tag_list_get_value_index (taglist, exiftag->gst_tag, 0);
/* do some conversion if needed */
switch (G_VALUE_TYPE (value)) {
case G_TYPE_DOUBLE:
num = g_value_get_double (value);
gst_exif_writer_write_signed_rational_tag_from_double (writer,
exiftag->exif_tag, num);
break;
default:
if (G_VALUE_TYPE (value) == GST_TYPE_FRACTION) {
gst_exif_writer_write_signed_rational_tag (writer, exiftag->exif_tag,
gst_value_get_fraction_numerator (value),
gst_value_get_fraction_denominator (value));
} else {
GST_WARNING ("Conversion from %s to signed rational not supported",
G_VALUE_TYPE_NAME (value));
}
break;
}
}
static void
write_exif_integer_tag_from_taglist (GstExifWriter * writer,
const GstTagList * taglist, const GstExifTagMatch * exiftag)
@ -980,6 +1018,9 @@ write_exif_tag_from_taglist (GstExifWriter * writer, const GstTagList * taglist,
case EXIF_TYPE_RATIONAL:
write_exif_rational_tag_from_taglist (writer, taglist, exiftag);
break;
case EXIF_TYPE_SRATIONAL:
write_exif_signed_rational_tag_from_taglist (writer, taglist, exiftag);
break;
case EXIF_TYPE_LONG:
case EXIF_TYPE_SHORT:
write_exif_integer_tag_from_taglist (writer, taglist, exiftag);
@ -1561,6 +1602,10 @@ parse_exif_ifd (GstExifReader * exif_reader, gint buf_offset,
parse_exif_rational_tag (exif_reader, tag_map[map_index].gst_tag,
tagdata.count, tagdata.offset, 1, FALSE);
break;
case EXIF_TYPE_SRATIONAL:
parse_exif_rational_tag (exif_reader, tag_map[map_index].gst_tag,
tagdata.count, tagdata.offset, 1, TRUE);
break;
case EXIF_TYPE_UNDEFINED:
parse_exif_undefined_tag (exif_reader, &tag_map[map_index],
tagdata.count, tagdata.offset, tagdata.offset_as_data);

10
tests/check/libs/tag.c
View file

@ -1525,6 +1525,16 @@ GST_START_TEST (test_exif_tags_serialization_deserialization)
g_value_set_double (&value, 600.0);
do_simple_exif_tag_serialization_deserialization
(GST_TAG_IMAGE_VERTICAL_PPI, &value);
g_value_set_double (&value, 0.0);
do_simple_exif_tag_serialization_deserialization
(GST_TAG_CAPTURING_EXPOSURE_COMPENSATION, &value);
g_value_set_double (&value, 1.0);
do_simple_exif_tag_serialization_deserialization
(GST_TAG_CAPTURING_EXPOSURE_COMPENSATION, &value);
g_value_set_double (&value, -2.5);
do_simple_exif_tag_serialization_deserialization
(GST_TAG_CAPTURING_EXPOSURE_COMPENSATION, &value);
g_value_unset (&value);
g_value_init (&value, G_TYPE_INT);