[gegl] ff-load: add 'frames' property

[Øyvind Kolås <ok src gnome org>]

commit b4c3dcc5a18636eea848894204f45ef62dff0c1d
Author: Øyvind Kolås <pippin gimp org>
Date:   Wed Sep 30 02:06:38 2015 +0200

    ff-load: add 'frames' property

 operations/external/ff-load.c |   17 +++++++++++++++--
 1 files changed, 15 insertions(+), 2 deletions(-)
---
diff --git a/operations/external/ff-load.c b/operations/external/ff-load.c
index f00eb45..aeb2eb3 100644
--- a/operations/external/ff-load.c
+++ b/operations/external/ff-load.c
@@ -19,7 +19,6 @@
 #include "config.h"
 #include <glib/gi18n-lib.h>
 
-
 #ifdef GEGL_PROPERTIES
 
 property_file_path (path, _("File"), "")
@@ -29,6 +28,11 @@ property_int (frame, _("Frame number"), 0)
    value_range (0, G_MAXINT)
    ui_range (0, 10000)
 
+property_int (frames, _("frames"), 0)
+   description (_("Number of frames in video, updates at least when first frame has been decoded."))
+   value_range (0, G_MAXINT)
+   ui_range (0, 10000)
+
 #else
 
 #define GEGL_OP_SOURCE
@@ -200,7 +204,7 @@ decode_frame (GeglOperation *operation,
         decodeframe = prevframe + 1;
     }
 
-  if (decodeframe < prevframe)
+  if (decodeframe < prevframe + 0.0) // XXX: shuts up gcc
     {
       /* seeking backwards, since it ffmpeg doesn't allow us,. we'll reload the file */
       g_free (p->loadedfilename);
@@ -352,6 +356,15 @@ prepare (GeglOperation *operation)
       p->prevframe = -1;
       p->coded_bytes = 0;
       p->coded_buf = NULL;
+
+      o->frames = p->video_st->nb_frames;
+      if (!o->frames)
+      {
+       /* With no declared frame count, compute number of frames based on
+           duration and video codecs frame
+         */
+        o->frames = p->ic->duration * p->video_st->time_base.den  / p->video_st->time_base.num / 
AV_TIME_BASE;
+      }
     }
 }