avcodec/ffwavesynth: Fix backward lcg_seek()

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

avcodec/ffwavesynth: Fix backward lcg_seek()
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
cf2bd3ce · Michael Niedermayer · 37708cba · cf2bd3ce
Commit cf2bd3ce authored Jun 21, 2019 by Michael Niedermayer
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ffwavesynth.c libavcodec/ffwavesynth.c +1 -1

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--- 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) {