[FFmpeg-cvslog] sws/output: use unsigned variables where harmless overflows are expected.

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Mon Sep 10 20:55:45 2012 +0200| [14de55784dcf0b875dab35896c9e55d5792c6fd4] | committer: Michael Niedermayer

sws/output: use unsigned variables where harmless overflows are expected.

signed overflow is undefined in C ...

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=14de55784dcf0b875dab35896c9e55d5792c6fd4
---

 libswscale/output.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/libswscale/output.c b/libswscale/output.c
index 8955665..5039629 100644
--- a/libswscale/output.c
+++ b/libswscale/output.c
@@ -175,7 +175,7 @@ yuv2planeX_16_c_template(const int16_t *filter, int filterSize,
          * reasonable filterSize), and re-add that at the end. */
         val -= 0x40000000;
         for (j = 0; j < filterSize; j++)
-            val += src[j][i] * filter[j];
+            val += src[j][i] * (unsigned)filter[j];
 
         output_pixel(&dest[i], val, 0x8000, int);
     }
@@ -627,12 +627,12 @@ yuv2rgb48_X_c_template(SwsContext *c, const int16_t *lumFilter,
         int R, G, B;
 
         for (j = 0; j < lumFilterSize; j++) {
-            Y1 += lumSrc[j][i * 2]     * lumFilter[j];
-            Y2 += lumSrc[j][i * 2 + 1] * lumFilter[j];
+            Y1 += lumSrc[j][i * 2]     * (unsigned)lumFilter[j];
+            Y2 += lumSrc[j][i * 2 + 1] * (unsigned)lumFilter[j];
         }
-        for (j = 0; j < chrFilterSize; j++) {
-            U += chrUSrc[j][i] * chrFilter[j];
-            V += chrVSrc[j][i] * chrFilter[j];
+        for (j = 0; j < chrFilterSize; j++) {;
+            U += chrUSrc[j][i] * (unsigned)chrFilter[j];
+            V += chrVSrc[j][i] * (unsigned)chrFilter[j];
         }
 
         // 8bit: 12+15=27; 16-bit: 12+19=31