avcodec/dcaenc: Fix undefined left shift of negative numbers

Affected the acodec-dca and acodec-dca2 FATE tests. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
4 years ago · 659a925939
parent 0c7d02844c
commit 659a925939
1 changed files with 4 additions and 4 deletions
--- a/libavcodec/dcaenc.c
+++ b/libavcodec/dcaenc.c
@ -925,10 +925,10 @@ static void fill_in_adpcm_bufer(DCAEncContext *c)
             * But there are no proper value in decoder history, so likely result will be no good.
             * Bitstream has "Predictor history flag switch", but this flag disables history for all subbands
             */
-            samples[0] = c->adpcm_history[ch][band][0] << 7;
-            samples[1] = c->adpcm_history[ch][band][1] << 7;
-            samples[2] = c->adpcm_history[ch][band][2] << 7;
-            samples[3] = c->adpcm_history[ch][band][3] << 7;
+            samples[0] = c->adpcm_history[ch][band][0] * (1 << 7);
+            samples[1] = c->adpcm_history[ch][band][1] * (1 << 7);
+            samples[2] = c->adpcm_history[ch][band][2] * (1 << 7);
+            samples[3] = c->adpcm_history[ch][band][3] * (1 << 7);
        }
     }
 }