[totem] backend: Automatically rotate mobile phone videos

[Bastien Nocera <hadess src gnome org>]

commit 238a61bcf8dbf30d231b6daf445c05399944e472
Author: Bastien Nocera <hadess hadess net>
Date:   Fri May 30 16:23:44 2014 +0200

    backend: Automatically rotate mobile phone videos
    
    For certain types of videos, and given a new enough version of
    the "qtdemux" plugin, GStreamer will tell us which is the best
    rotation for a video. This will automatically show videos the
    right way around for videos captured upside-down or in portrait mode
    on smartphones.

 src/backend/bacon-video-widget.c |   34 ++++++++++++++++++++++++++++++++++
 1 files changed, 34 insertions(+), 0 deletions(-)
---
diff --git a/src/backend/bacon-video-widget.c b/src/backend/bacon-video-widget.c
index efe9e90..ed797df 100644
--- a/src/backend/bacon-video-widget.c
+++ b/src/backend/bacon-video-widget.c
@@ -1930,6 +1930,37 @@ bvw_check_missing_plugins_on_preroll (BaconVideoWidget * bvw)
 }
 
 static void
+update_orientation_from_video (BaconVideoWidget *bvw)
+{
+  BvwRotation rotation = BVW_ROTATION_R_ZERO;
+  char *orientation_str = NULL;
+  gboolean ret;
+  gdouble angle;
+
+  /* Don't change the rotation if explicitely set */
+  if (bvw->priv->rotation != BVW_ROTATION_R_ZERO)
+    return;
+
+  ret = gst_tag_list_get_string_index (bvw->priv->tagcache,
+                                      GST_TAG_IMAGE_ORIENTATION, 0, &orientation_str);
+  if (!ret || !orientation_str)
+    rotation = BVW_ROTATION_R_ZERO;
+  else if (g_str_equal (orientation_str, "rotate-90"))
+    rotation = BVW_ROTATION_R_90R;
+  else if (g_str_equal (orientation_str, "rotate-180"))
+    rotation = BVW_ROTATION_R_180;
+  else if (g_str_equal (orientation_str, "rotate-270"))
+    rotation = BVW_ROTATION_R_90L;
+  else
+    g_warning ("Unhandled orientation value: '%s'", orientation_str);
+
+  g_free (orientation_str);
+
+  angle = rotation * 90.0;
+  totem_aspect_frame_set_rotation (TOTEM_ASPECT_FRAME (bvw->priv->frame), angle);
+}
+
+static void
 bvw_update_tags (BaconVideoWidget * bvw, GstTagList *tag_list, const gchar *type)
 {
   GstTagList **cache = NULL;
@@ -1967,6 +1998,8 @@ bvw_update_tags (BaconVideoWidget * bvw, GstTagList *tag_list, const gchar *type
 
   g_signal_emit (bvw, bvw_signals[SIGNAL_GOT_METADATA], 0);
 
+  update_orientation_from_video (bvw);
+
   set_current_actor (bvw);
 }
 
@@ -4160,6 +4193,7 @@ bvw_stop_play_pipeline (BaconVideoWidget * bvw)
   g_clear_object (&bvw->priv->cover_pixbuf);
   clutter_actor_hide (bvw->priv->spinner);
   g_object_set (G_OBJECT (bvw->priv->spinner), "percent", 0.0, NULL);
+  totem_aspect_frame_set_internal_rotation (TOTEM_ASPECT_FRAME (bvw->priv->frame), 0.0);
   GST_DEBUG ("stopped");
 }