[FFmpeg-cvslog] avfilter/vf_sab: fix filtering tiny images

[Michael Niedermayer]

ffmpeg | branch: release/2.5 | Michael Niedermayer <michaelni at gmx.at> | Sun Jan  4 01:03:26 2015 +0100| [252ba4a9259fcaf18f5f340da364e7d536bc6788] | committer: Michael Niedermayer

avfilter/vf_sab: fix filtering tiny images

Fixes out of array reads

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit 9bff052b51f27f6cce04e8d7d8b405c710d7ad67)

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=252ba4a9259fcaf18f5f340da364e7d536bc6788
---

 libavfilter/vf_sab.c |   22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/libavfilter/vf_sab.c b/libavfilter/vf_sab.c
index aa38b53..b8af27c 100644
--- a/libavfilter/vf_sab.c
+++ b/libavfilter/vf_sab.c
@@ -220,6 +220,19 @@ static int config_props(AVFilterLink *inlink)
 
 #define NB_PLANES 4
 
+static inline int mirror(int x, int w)
+{
+    if (!w)
+        return 0;
+
+    while ((unsigned)x > (unsigned)w) {
+        x = -x;
+        if (x < 0)
+            x += 2 * w;
+    }
+    return x;
+}
+
 static void blur(uint8_t       *dst, const int dst_linesize,
                  const uint8_t *src, const int src_linesize,
                  const int w, const int h, FilterParam *fp)
@@ -253,8 +266,7 @@ static void blur(uint8_t       *dst, const int dst_linesize,
                 for (dy = 0; dy < radius*2 + 1; dy++) {
                     int dx;
                     int iy = y+dy - radius;
-                    if      (iy < 0)  iy = -iy;
-                    else if (iy >= h) iy = h+h-iy-1;
+                    iy = mirror(iy, h-1);
 
                     for (dx = 0; dx < radius*2 + 1; dx++) {
                         const int ix = x+dx - radius;
@@ -265,13 +277,11 @@ static void blur(uint8_t       *dst, const int dst_linesize,
                 for (dy = 0; dy < radius*2+1; dy++) {
                     int dx;
                     int iy = y+dy - radius;
-                    if      (iy <  0) iy = -iy;
-                    else if (iy >= h) iy = h+h-iy-1;
+                    iy = mirror(iy, h-1);
 
                     for (dx = 0; dx < radius*2 + 1; dx++) {
                         int ix = x+dx - radius;
-                        if      (ix < 0)  ix = -ix;
-                        else if (ix >= w) ix = w+w-ix-1;
+                        ix = mirror(ix, w-1);
                         UPDATE_FACTOR;
                     }
                 }