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diff --git a/media/libstagefright/codecs/amrwb/src/scale_signal.cpp b/media/libstagefright/codecs/amrwb/src/scale_signal.cpp
new file mode 100644
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+++ b/media/libstagefright/codecs/amrwb/src/scale_signal.cpp
@@ -0,0 +1,154 @@
+/* ------------------------------------------------------------------
+ * Copyright (C) 1998-2009 PacketVideo
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+ * express or implied.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ * -------------------------------------------------------------------
+ */
+/****************************************************************************************
+Portions of this file are derived from the following 3GPP standard:
+
+    3GPP TS 26.173
+    ANSI-C code for the Adaptive Multi-Rate - Wideband (AMR-WB) speech codec
+    Available from http://www.3gpp.org
+
+(C) 2007, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
+Permission to distribute, modify and use this file under the standard license
+terms listed above has been obtained from the copyright holder.
+****************************************************************************************/
+/*
+------------------------------------------------------------------------------
+
+
+
+ Filename: scale_signal.cpp
+
+     Date: 05/08/2004
+
+------------------------------------------------------------------------------
+ REVISION HISTORY
+
+
+ Description:
+
+------------------------------------------------------------------------------
+ INPUT AND OUTPUT DEFINITIONS
+
+     int16 signal[],             (i/o) : signal to scale
+     int16 lg,                   (i)   : size of x[]
+     int16 exp                   (i)   : exponent: x = round(x << exp)
+
+------------------------------------------------------------------------------
+ FUNCTION DESCRIPTION
+
+   Scale signal to get maximum of dynamic range
+
+
+------------------------------------------------------------------------------
+ REQUIREMENTS
+
+
+------------------------------------------------------------------------------
+ REFERENCES
+
+------------------------------------------------------------------------------
+ PSEUDO-CODE
+
+------------------------------------------------------------------------------
+*/
+
+
+/*----------------------------------------------------------------------------
+; INCLUDES
+----------------------------------------------------------------------------*/
+
+#include "pv_amr_wb_type_defs.h"
+#include "pvamrwbdecoder_basic_op.h"
+#include "pvamrwbdecoder_acelp.h"
+
+/*----------------------------------------------------------------------------
+; MACROS
+; Define module specific macros here
+----------------------------------------------------------------------------*/
+
+
+/*----------------------------------------------------------------------------
+; DEFINES
+; Include all pre-processor statements here. Include conditional
+; compile variables also.
+----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+; LOCAL FUNCTION DEFINITIONS
+; Function Prototype declaration
+----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+; LOCAL STORE/BUFFER/POINTER DEFINITIONS
+; Variable declaration - defined here and used outside this module
+----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+; EXTERNAL FUNCTION REFERENCES
+; Declare functions defined elsewhere and referenced in this module
+----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES
+; Declare variables used in this module but defined elsewhere
+----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+; FUNCTION CODE
+----------------------------------------------------------------------------*/
+
+void scale_signal(
+    int16 x[],              /* (i/o) : signal to scale               */
+    int16 lg,               /* (i)   : size of x[]                   */
+    int16 exp               /* (i)   : exponent: x = round(x << exp) */
+)
+{
+    int16 i;
+    int16 tmp;
+    int16 *pt_x;
+
+
+    int32 L_tmp;
+
+
+    if (exp > 0)
+    {
+        for (i = 0; i < lg; i++)
+        {
+            L_tmp = shl_int32(((int32)x[i] << 16), exp);       /* saturation can occur here */
+            x[i] = amr_wb_round(L_tmp);
+        }
+    }
+    else if (exp < 0)
+    {
+        exp = -exp;
+        exp &= 0xf;
+        tmp = (int16)(0x00008000 >> (16 - exp));
+        pt_x = x;
+
+        for (i = lg >> 1; i != 0; i--)
+        {
+            *(pt_x)   = add_int16(*(pt_x), tmp) >> exp;
+            pt_x++;
+            *(pt_x)   = add_int16(*(pt_x), tmp) >> exp;
+            pt_x++;
+        }
+
+    }
+    return;
+}