x(v)image: use gst_video_meta_set_alignment()

Use the new API to tell buffer consumers about alignment details.

This change is backward compatible as non ported elements can safely
ignore the alignment information and keep processing buffers as they use
to, copying if necessary.

sys/ximage/ximagepool.c

@@ -648,12 +648,16 @@ ximage_buffer_pool_alloc (GstBufferPool * pool, GstBuffer ** buffer,
   gst_buffer_append_memory (ximage, mem);
 
   if (xpool->add_metavideo) {
+    GstVideoMeta *meta;
+
     GST_DEBUG_OBJECT (pool, "adding GstVideoMeta");
     /* these are just the defaults for now */
-    gst_buffer_add_video_meta_full (ximage, GST_VIDEO_FRAME_FLAG_NONE,
+    meta = gst_buffer_add_video_meta_full (ximage, GST_VIDEO_FRAME_FLAG_NONE,
         GST_VIDEO_INFO_FORMAT (info), GST_VIDEO_INFO_WIDTH (info),
         GST_VIDEO_INFO_HEIGHT (info), GST_VIDEO_INFO_N_PLANES (info),
         info->offset, info->stride);
+
+    gst_video_meta_set_alignment (meta, xpool->align);
   }
   *buffer = ximage;
 

sys/xvimage/xvimagepool.c

@@ -183,11 +183,15 @@ xvimage_buffer_pool_alloc (GstBufferPool * pool, GstBuffer ** buffer,
   gst_buffer_append_memory (xvimage, mem);
 
   if (xvpool->add_metavideo) {
+    GstVideoMeta *meta;
+
     GST_DEBUG_OBJECT (pool, "adding GstVideoMeta");
-    gst_buffer_add_video_meta_full (xvimage, GST_VIDEO_FRAME_FLAG_NONE,
+    meta = gst_buffer_add_video_meta_full (xvimage, GST_VIDEO_FRAME_FLAG_NONE,
         GST_VIDEO_INFO_FORMAT (info), GST_VIDEO_INFO_WIDTH (info),
         GST_VIDEO_INFO_HEIGHT (info), GST_VIDEO_INFO_N_PLANES (info),
         info->offset, info->stride);
+
+    gst_video_meta_set_alignment (meta, xvpool->align);
   }
 
   *buffer = xvimage;