From 83a60c2d1ca3470e5cf5114124858b0d6c4061de Mon Sep 17 00:00:00 2001
From: Markus Multrus <markus.multrus@iis.fraunhofer.de>
Date: Sun, 1 Jun 2025 19:24:04 +0200
Subject: [PATCH] separate changes to lib_com/ivas_dirac_com_fx.c from
 cldfb_opt

---
 lib_com/ivas_dirac_com_fx.c | 26 ++++++++++++++++++++++++++
 lib_com/options.h           |  2 ++
 2 files changed, 28 insertions(+)

diff --git a/lib_com/ivas_dirac_com_fx.c b/lib_com/ivas_dirac_com_fx.c
index 4279065b0..ee1bc958e 100644
--- a/lib_com/ivas_dirac_com_fx.c
+++ b/lib_com/ivas_dirac_com_fx.c
@@ -1026,6 +1026,7 @@ void computeDiffuseness_fixed(
     q_intensity_slow = sub( add( q_intensity, q_intensity ), 31 );
 
     /* Compute Diffuseness */
+#ifndef OPT_SBA_DEC_PATH
     p_tmp = intensity_slow_abs;
     exp2 = 0;
     move16();
@@ -1064,6 +1065,31 @@ void computeDiffuseness_fixed(
             move32();
         }
     }
+#else /* OPT_SBA_DEC_PATH */
+    Word16 diff = sub( 62, q_ene );
+    p_tmp = intensity_slow_abs;
+    FOR( i = 0; i < num_freq_bands; ++i )
+    {
+
+        exp1 = sub( 31, q_intensity_slow );
+        tmp = Sqrt32( p_tmp[i], &exp1 );
+
+        tmp = BASOP_Util_Divide3232_Scale_newton( tmp, L_add( energy_slow[i], EPSILLON_FX ), &exp2 );
+        q_tmp = sub( diff, add( exp1, exp2 ) );
+        // bring to Q30
+        tmp = L_shl_sat( tmp, sub( Q30, q_tmp ) );
+        diffuseness[i] = L_sub( ONE_IN_Q30, tmp );
+        move32();
+
+        if ( LT_32( diffuseness[i], 0 ) )
+        {
+            diffuseness[i] = 0;
+            move32();
+        }
+    }
+
+#endif /* OPT_SBA_DEC_PATH */
+
     *q_diffuseness = Q30;
     move16();
 
diff --git a/lib_com/options.h b/lib_com/options.h
index a5d5a4846..f685c5541 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -106,4 +106,6 @@
 
 #define FIX_1713_EXP                            /* VA: proposed correction to exp in ic-BWE*/
 
+#define OPT_SBA_DEC_PATH
+
 #endif
-- 
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