1 files changed, 22 insertions, 12 deletions

diff --git a/libavfilter/vf_vflip.c b/libavfilter/vf_vflip.c
index fa54985722..c7c39d3341 100644
--- a/libavfilter/vf_vflip.c
+++ b/libavfilter/vf_vflip.c
@@ -1,20 +1,20 @@
 /*
  * Copyright (c) 2007 Bobby Bingham
  *
- * This file is part of Libav.
+ * This file is part of FFmpeg.
  *
- * Libav is free software; you can redistribute it and/or
+ * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
- * Libav is distributed in the hope that it will be useful,
+ * FFmpeg 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
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
@@ -24,15 +24,23 @@
  */
 
 #include "libavutil/internal.h"
+#include "libavutil/opt.h"
 #include "libavutil/pixdesc.h"
 #include "avfilter.h"
 #include "internal.h"
 #include "video.h"
 
 typedef struct FlipContext {
+    const AVClass *class;
     int vsub;   ///< vertical chroma subsampling
 } FlipContext;
 
+static const AVOption vflip_options[] = {
+    { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(vflip);
+
 static int config_input(AVFilterLink *link)
 {
     FlipContext *flip = link->dst->priv;
@@ -55,9 +63,10 @@ static AVFrame *get_video_buffer(AVFilterLink *link, int w, int h)
 
     for (i = 0; i < 4; i ++) {
         int vsub = i == 1 || i == 2 ? flip->vsub : 0;
+        int height = AV_CEIL_RSHIFT(h, vsub);
 
         if (frame->data[i]) {
-            frame->data[i] += ((h >> vsub) - 1) * frame->linesize[i];
+            frame->data[i] += (height - 1) * frame->linesize[i];
             frame->linesize[i] = -frame->linesize[i];
         }
     }
@@ -72,9 +81,10 @@ static int filter_frame(AVFilterLink *link, AVFrame *frame)
 
     for (i = 0; i < 4; i ++) {
         int vsub = i == 1 || i == 2 ? flip->vsub : 0;
+        int height = AV_CEIL_RSHIFT(link->h, vsub);
 
         if (frame->data[i]) {
-            frame->data[i] += ((link->h >> vsub)-1) * frame->linesize[i];
+            frame->data[i] += (height - 1) * frame->linesize[i];
             frame->linesize[i] = -frame->linesize[i];
         }
     }
@@ -101,11 +111,11 @@ static const AVFilterPad avfilter_vf_vflip_outputs[] = {
 };
 
 AVFilter ff_vf_vflip = {
-    .name      = "vflip",
+    .name        = "vflip",
     .description = NULL_IF_CONFIG_SMALL("Flip the input video vertically."),
-
-    .priv_size = sizeof(FlipContext),
-
-    .inputs    = avfilter_vf_vflip_inputs,
-    .outputs   = avfilter_vf_vflip_outputs,
+    .priv_size   = sizeof(FlipContext),
+    .priv_class  = &vflip_class,
+    .inputs      = avfilter_vf_vflip_inputs,
+    .outputs     = avfilter_vf_vflip_outputs,
+    .flags       = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
 };