From ae264bb29be3506a489347c6e27a04cded0de621 Mon Sep 17 00:00:00 2001
From: Justin Ruggles <justin.ruggles@gmail.com>
Date: Sun, 7 Aug 2011 17:47:42 -0400
Subject: ac3enc: Add channel coupling support for the fixed-point AC-3
 encoder.

Update FATE references accordingly.
---
 libavcodec/ac3enc_float.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'libavcodec/ac3enc_float.c')

diff --git a/libavcodec/ac3enc_float.c b/libavcodec/ac3enc_float.c
index 32ec558e70..598c69db1b 100644
--- a/libavcodec/ac3enc_float.c
+++ b/libavcodec/ac3enc_float.c
@@ -120,6 +120,18 @@ static void clip_coefficients(DSPContext *dsp, float *coef, unsigned int len)
 }
 
 
+/**
+ * Calculate a single coupling coordinate.
+ */
+static CoefType calc_cpl_coord(CoefSumType energy_ch, CoefSumType energy_cpl)
+{
+    float coord = 0.125;
+    if (energy_cpl > 0)
+        coord *= sqrtf(energy_ch / energy_cpl);
+    return FFMIN(coord, COEF_MAX);
+}
+
+
 #if CONFIG_AC3_ENCODER
 AVCodec ff_ac3_encoder = {
     .name           = "ac3",
-- 
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