From 337eed6e91573039db27d3cb9122bb1c357082aa Mon Sep 17 00:00:00 2001
From: Wim Taymans <wim.taymans@collabora.co.uk>
Date: Fri, 2 Mar 2012 13:04:26 +0100
Subject: [PATCH] videometa: add videoscale metadata transform

---
 gst-libs/gst/video/gstvideometa.c | 57 +++++++++++++++++++++++++++++----------
 gst-libs/gst/video/gstvideometa.h | 26 ++++++++++++++++++
 2 files changed, 69 insertions(+), 14 deletions(-)

diff --git a/gst-libs/gst/video/gstvideometa.c b/gst-libs/gst/video/gstvideometa.c
index e1f35ef..687e930 100644
--- a/gst-libs/gst/video/gstvideometa.c
+++ b/gst-libs/gst/video/gstvideometa.c
@@ -29,20 +29,27 @@ gst_video_meta_transform (GstBuffer * dest, GstMeta * meta,
   smeta = (GstVideoMeta *) meta;
 
   if (GST_META_TRANSFORM_IS_COPY (type)) {
-    dmeta =
-        (GstVideoMeta *) gst_buffer_add_meta (dest, GST_VIDEO_META_INFO, NULL);
-    dmeta->buffer = dest;
-
-    dmeta->flags = smeta->flags;
-    dmeta->id = smeta->id;
-    dmeta->format = smeta->format;
-    dmeta->width = smeta->width;
-    dmeta->height = smeta->height;
-
-    dmeta->n_planes = smeta->n_planes;
-    for (i = 0; i < dmeta->n_planes; i++) {
-      dmeta->offset[i] = smeta->offset[i];
-      dmeta->stride[i] = smeta->stride[i];
+    GstMetaTransformCopy *copy = data;
+
+    if (!copy->region) {
+      /* only copy if the complete data is copied as well */
+      dmeta =
+          (GstVideoMeta *) gst_buffer_add_meta (dest, GST_VIDEO_META_INFO,
+          NULL);
+      dmeta->buffer = dest;
+
+      GST_DEBUG ("copy video metadata");
+      dmeta->flags = smeta->flags;
+      dmeta->id = smeta->id;
+      dmeta->format = smeta->format;
+      dmeta->width = smeta->width;
+      dmeta->height = smeta->height;
+
+      dmeta->n_planes = smeta->n_planes;
+      for (i = 0; i < dmeta->n_planes; i++) {
+        dmeta->offset[i] = smeta->offset[i];
+        dmeta->stride[i] = smeta->stride[i];
+      }
     }
   }
   return TRUE;
@@ -310,10 +317,14 @@ gst_video_crop_meta_transform (GstBuffer * dest, GstMeta * meta,
     smeta = (GstVideoCropMeta *) meta;
     dmeta = gst_buffer_add_video_crop_meta (dest);
 
+    GST_DEBUG ("copy crop metadata");
     dmeta->x = smeta->x;
     dmeta->y = smeta->y;
     dmeta->width = smeta->width;
     dmeta->height = smeta->height;
+  } else if (GST_VIDEO_META_TRANSFORM_IS_SCALE (type)) {
+    /* FIXME, do something */
+    GST_DEBUG ("scaling crop metadata");
   }
   return TRUE;
 }
@@ -344,3 +355,21 @@ gst_video_crop_meta_get_info (void)
   }
   return video_crop_meta_info;
 }
+
+/**
+ * gst_video_meta_transform_scale_get_quark:
+ *
+ * Get the #GQuark for the "gst-video-scale" metadata transform operation.
+ *
+ * Returns: a #GQuark
+ */
+GQuark
+gst_video_meta_transform_scale_get_quark (void)
+{
+  static GQuark _value = 0;
+
+  if (_value == 0) {
+    _value = g_quark_from_static_string ("gst-video-scale");
+  }
+  return _value;
+}
diff --git a/gst-libs/gst/video/gstvideometa.h b/gst-libs/gst/video/gstvideometa.h
index dae8d34..6d52202 100644
--- a/gst-libs/gst/video/gstvideometa.h
+++ b/gst-libs/gst/video/gstvideometa.h
@@ -115,6 +115,32 @@ const GstMetaInfo * gst_video_crop_meta_get_info (void);
 #define gst_buffer_get_video_crop_meta(b) ((GstVideoCropMeta*)gst_buffer_get_meta((b),GST_VIDEO_CROP_META_API_TYPE))
 #define gst_buffer_add_video_crop_meta(b) ((GstVideoCropMeta*)gst_buffer_add_meta((b),GST_VIDEO_CROP_META_INFO, NULL))
 
+/* metadata transforms */
+
+GQuark gst_video_meta_transform_scale_get_quark (void);
+/**
+ * gst_video_meta_transform_scale:
+ *
+ * GQuark for the video "gst-video-scale" transform.
+ */
+#define GST_VIDEO_META_TRANSFORM_IS_SCALE(type) ((type) == gst_video_meta_transform_scale_get_quark())
+
+/**
+ * GstVideoMetaTransformScale:
+ * @old_width: the old width
+ * @old_height: the old height
+ * @new_width: the new width
+ * @new_height: the new height
+ *
+ * Extra data passed to a video "scale" transform #GstMetaTransformFunction.
+ */
+typedef struct {
+  gint old_width;
+  gint old_height;
+  gint new_width;
+  gint new_height;
+} GstVideoMetaTransformScale;
+
 G_END_DECLS
 
 #endif /* __GST_VIDEO_META_H__ */
-- 
2.7.4