Fix an overflow in the predictor.

fixes issue 636 Patch by Jai. Originally committed as revision 16007 to svn://svn.ffmpeg.org/ffmpeg/trunk
16 years ago · 3d5e1bfb20
parent 6e74619e5e
commit 3d5e1bfb20
1 changed files with 2 additions and 1 deletions
--- a/libavcodec/alacenc.c
+++ b/libavcodec/alacenc.c
@ -253,7 +253,8 @@ static void alac_linear_predictor(AlacEncodeContext *s, int ch)

            sum >>= lpc.lpc_quant;
            sum += samples[0];
-            residual[i] = samples[lpc.lpc_order+1] - sum;
+            residual[i] = (samples[lpc.lpc_order+1] - sum) << (32 - s->write_sample_size) >>
+                          (32 - s->write_sample_size);
            res_val = residual[i];

            if(res_val) {