tag: Adds some basic photography tags

Adds the following basic photography tags.

API: GST_TAG_CAPTURING_SHUTTER_SPEED
API: GST_TAG_CAPTURING_FOCAL_RATIO
API: GST_TAG_CAPTURING_FOCAL_LENGTH
API: GST_TAG_CAPTURING_DIGITAL_ZOOM_RATIO
API: GST_TAG_CAPTURING_ISO_SPEED

Fixes #626651

1 files changed, 47 insertions, 0 deletions

diff --git a/gst-libs/gst/tag/tag.h b/gst-libs/gst/tag/tag.h
index c00f22cfd..399bc4331 100644
--- a/gst-libs/gst/tag/tag.h
+++ b/gst-libs/gst/tag/tag.h
@@ -120,6 +120,53 @@ G_BEGIN_DECLS
  */
 #define GST_TAG_CDDA_MUSICBRAINZ_DISCID_FULL  "musicbrainz-discid-full"
 
+/**
+ * GST_TAG_CAPTURING_SHUTTER_SPEED:
+ *
+ * Shutter speed used when capturing an image, in seconds. (fraction)
+ *
+ * Since: 0.10.31
+ */
+#define GST_TAG_CAPTURING_SHUTTER_SPEED        "capturing-shutter-speed"
+
+/**
+ * GST_TAG_CAPTURING_FOCAL_RATIO:
+ *
+ * Focal ratio (f-number) used when capturing an image. (double)
+ *
+ * The value stored is the denominator of the focal ratio (f-number).
+ * For example, if this tag value is 2, the focal ratio is f/2.
+ *
+ * Since: 0.10.31
+ */
+#define GST_TAG_CAPTURING_FOCAL_RATIO          "capturing-focal-ratio"
+
+/**
+ * GST_TAG_CAPTURING_FOCAL_LENGTH:
+ *
+ * Focal length used when capturing an image, in mm. (double)
+ *
+ * Since: 0.10.31
+ */
+#define GST_TAG_CAPTURING_FOCAL_LENGTH         "capturing-focal-length"
+
+/**
+ * GST_TAG_CAPTURING_DIGITAL_ZOOM_RATIO:
+ *
+ * Digital zoom ratio used when capturing an image. (double)
+ *
+ * Since: 0.10.31
+ */
+#define GST_TAG_CAPTURING_DIGITAL_ZOOM_RATIO   "capturing-digital-zoom-ratio"
+
+/**
+ * GST_TAG_CAPTURING_ISO_SPEED:
+ *
+ * ISO speed used when capturing an image. (integer)
+ *
+ * Since: 0.10.31
+ */
+#define GST_TAG_CAPTURING_ISO_SPEED           "capturing-iso-speed"
 
 
 /* additional information for image tags */