From 2f37321abcbf9be5f58647b17155c0e257949c0d Mon Sep 17 00:00:00 2001
From: Justin Ruggles <justin.ruggles@gmail.com>
Date: Mon, 6 Jun 2011 17:10:11 -0400
Subject: [PATCH] iirfilter: fix biquad filter coefficients.

The current filter implementation should only have the cx coefficients
divided by gain in order to give the correct output scale.
---
 libavcodec/iirfilter.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/libavcodec/iirfilter.c b/libavcodec/iirfilter.c
index 98366e2c08..a942068aee 100644
--- a/libavcodec/iirfilter.c
+++ b/libavcodec/iirfilter.c
@@ -151,8 +151,6 @@ static int biquad_init_coeffs(void *avc, struct FFIIRFilterCoeffs *c,
     // during filtering, the delay state will include the gain multiplication
     c->cx[0] = lrintf(x0 / c->gain);
     c->cx[1] = lrintf(x1 / c->gain);
-    c->cy[0] /= c->gain;
-    c->cy[1] /= c->gain;
 
     return 0;
 }