[FFmpeg-cvslog] avcodec/a64multienc: fix use of uninitialized values in to_meta_with_crop

[Andreas Cadhalpun]

ffmpeg | branch: release/0.7 | Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com> | Sun Feb 22 20:48:38 2015 +0100| [1979bfecc78034426bf39442cfbd8a3c8c35e6ae] | committer: Michael Niedermayer

avcodec/a64multienc: fix use of uninitialized values in to_meta_with_crop

Averaging over 2 pixels doesn't work correctly for the last pixel, because the
rest of the buffer is not initialized.

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit 87513d654546a99f8ddb045ca4fa5d33778a617e)

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=1979bfecc78034426bf39442cfbd8a3c8c35e6ae
---

 libavcodec/a64multienc.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/libavcodec/a64multienc.c b/libavcodec/a64multienc.c
index 5a665d0..c029e9e 100644
--- a/libavcodec/a64multienc.c
+++ b/libavcodec/a64multienc.c
@@ -55,9 +55,13 @@ static void to_meta_with_crop(AVCodecContext *avctx, AVFrame *p, int *dest)
             for (y = blocky; y < blocky + 8 && y < C64YRES; y++) {
                 for (x = blockx; x < blockx + 8 && x < C64XRES; x += 2) {
                     if(x < width && y < height) {
-                        /* build average over 2 pixels */
-                        luma = (src[(x + 0 + y * p->linesize[0])] +
-                                src[(x + 1 + y * p->linesize[0])]) / 2;
+                        if (x + 1 < width) {
+                            /* build average over 2 pixels */
+                            luma = (src[(x + 0 + y * p->linesize[0])] +
+                                    src[(x + 1 + y * p->linesize[0])]) / 2;
+                        } else {
+                            luma = src[(x + y * p->linesize[0])];
+                        }
                         /* write blocks as linear data now so they are suitable for elbg */
                         dest[0] = luma;
                     }