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diff --git a/media/libstagefright/codecs/amrwb/src/weight_amrwb_lpc.cpp b/media/libstagefright/codecs/amrwb/src/weight_amrwb_lpc.cpp
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+/* ------------------------------------------------------------------
+ * 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: weight_amrwb_lpc.cpp
+
+     Date: 05/08/2007
+
+------------------------------------------------------------------------------
+ REVISION HISTORY
+
+
+ Description:
+
+------------------------------------------------------------------------------
+ INPUT AND OUTPUT DEFINITIONS
+
+     int16 a[],            (i) Q12 : a[m+1]  LPC coefficients
+     int16 ap[],           (o) Q12 : Spectral expanded LPC coefficients
+     int16 gamma,          (i) Q15 : Spectral expansion factor.
+     int16 m               (i)     : LPC order.
+
+------------------------------------------------------------------------------
+ FUNCTION DESCRIPTION
+
+   Weighting of LPC coefficients.
+     ap[i]  =  a[i]   (gamma    i)
+
+------------------------------------------------------------------------------
+ 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 weight_amrwb_lpc(
+    int16 a[],          /* (i) Q12 : a[m+1]  LPC coefficients             */
+    int16 ap[],         /* (o) Q12 : Spectral expanded LPC coefficients   */
+    int16 gamma,        /* (i) Q15 : Spectral expansion factor.           */
+    int16 m             /* (i)     : LPC order.                           */
+)
+{
+    int16 i, fac;
+    int32 roundFactor = 0x00004000L;
+    ap[0] = a[0];
+    fac = gamma;
+    for (i = 1; i < m; i++)
+    {
+        ap[i] = (int16)(fxp_mac_16by16(a[i], fac, roundFactor) >> 15);
+        fac   = (int16)(fxp_mac_16by16(fac, gamma, roundFactor) >> 15);
+    }
+    ap[i] = (int16)(fxp_mac_16by16(a[i], fac, roundFactor) >> 15);
+
+    return;
+}