Adds a new Image Quality Assessment plugin.

It only offers one metric for now, "dssim", available if
https://github.com/pornel/dssim was installed on the system
at the time the plugin was compiled.

The spearman correlation for dssim against the TID2008 dataset
is 0.81, against 0.70 for the old ssim implementation, and
it runs 15 times faster.

https://bugzilla.gnome.org/show_bug.cgi?id=751324

1 files changed, 64 insertions, 0 deletions

diff --git a/ext/iqa/iqa.h b/ext/iqa/iqa.h
new file mode 100644
index 000000000..e879daa26
--- /dev/null
+++ b/ext/iqa/iqa.h
@@ -0,0 +1,64 @@
+/* Image Quality Assessment plugin
+ * Copyright (C) 2015 Mathieu Duponchelle <mathieu.duponchelle@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., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __GST_IQA_H__
+#define __GST_IQA_H__
+
+#include <gst/gst.h>
+#include <gst/video/video.h>
+#include <gst/video/gstvideoaggregator.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_IQA (gst_iqa_get_type())
+#define GST_IQA(obj) \
+        (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_IQA, GstIqa))
+#define GST_IQA_CLASS(klass) \
+        (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_IQA, GstIqaClass))
+#define GST_IS_IQA(obj) \
+        (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_IQA))
+#define GST_IS_IQA_CLASS(klass) \
+        (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_IQA))
+
+typedef struct _GstIqa GstIqa;
+typedef struct _GstIqaClass GstIqaClass;
+
+/**
+ * GstIqa:
+ *
+ * The opaque #GstIqa structure.
+ */
+struct _GstIqa
+{
+  GstVideoAggregator videoaggregator;
+
+  gboolean do_dssim;
+  double max_dssim;
+};
+
+struct _GstIqaClass
+{
+  GstVideoAggregatorClass parent_class;
+};
+
+GType gst_iqa_get_type (void);
+
+G_END_DECLS
+#endif /* __GST_IQA_H__ */
+