Prevent scalefactors from overflowing.

fixes issue351

Originally committed as revision 13591 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/libavcodec/mpegaudioenc.c b/libavcodec/mpegaudioenc.c
index f117d31b7950211c6421cf84ccbe6ef4d541ed8e..a67ca213ed2f395894b2c1440153d1f9b67c9193 100644 (file)
--- a/libavcodec/mpegaudioenc.c
+++ b/libavcodec/mpegaudioenc.c
@@ -387,7 +387,7 @@ static void compute_scale_factors(unsigned char scale_code[SBLIMIT],
                     vmax = v;
             }
             /* compute the scale factor index using log 2 computations */
-            if (vmax > 0) {
+            if (vmax > 1) {
                 n = av_log2(vmax);
                 /* n is the position of the MSB of vmax. now
                    use at most 2 compares to find the index */