From cf2bd3ce79b12256d7d129b2ada5ee649b9a27eb Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Fri, 21 Jun 2019 22:08:27 +0200
Subject: [PATCH] avcodec/ffwavesynth: Fix backward lcg_seek()

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/ffwavesynth.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/ffwavesynth.c b/libavcodec/ffwavesynth.c
index a66113972b..cf8c780f3e 100644
--- a/libavcodec/ffwavesynth.c
+++ b/libavcodec/ffwavesynth.c
@@ -122,7 +122,7 @@ static void lcg_seek(uint32_t *s, int64_t dt)
         c = LCG_C;
     } else { /* coefficients for a step backward */
         a = LCG_AI;
-        c = (uint32_t)(LCG_AI * LCG_C);
+        c = (uint32_t)(-LCG_AI * LCG_C);
         dt = -dt;
     }
     while (dt) {