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diff --git a/media/libstagefright/codecs/amrwb/src/interpolate_isp.cpp b/media/libstagefright/codecs/amrwb/src/interpolate_isp.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: interpolate_isp.cpp
+
+     Date: 05/08/2004
+
+------------------------------------------------------------------------------
+ REVISION HISTORY
+
+
+ Description:
+
+------------------------------------------------------------------------------
+ INPUT AND OUTPUT DEFINITIONS
+
+     int16 isp_old[],         input : isps from past frame
+     int16 isp_new[],         input : isps from present frame
+     const int16 frac[],      input : fraction for 3 first subfr (Q15)
+     int16 Az[]               output: LP coefficients in 4 subframes
+
+
+------------------------------------------------------------------------------
+ FUNCTION DESCRIPTION
+
+    Interpolation of the LP parameters in 4 subframes
+
+
+------------------------------------------------------------------------------
+ REQUIREMENTS
+
+
+------------------------------------------------------------------------------
+ REFERENCES
+
+------------------------------------------------------------------------------
+ PSEUDO-CODE
+
+------------------------------------------------------------------------------
+*/
+
+
+/*----------------------------------------------------------------------------
+; INCLUDES
+----------------------------------------------------------------------------*/
+
+#include "pv_amr_wb_type_defs.h"
+#include "pvamrwbdecoder_basic_op.h"
+#include "pvamrwbdecoder_cnst.h"
+#include "pvamrwbdecoder_acelp.h"
+
+/*----------------------------------------------------------------------------
+; MACROS
+; Define module specific macros here
+----------------------------------------------------------------------------*/
+
+
+/*----------------------------------------------------------------------------
+; DEFINES
+; Include all pre-processor statements here. Include conditional
+; compile variables also.
+----------------------------------------------------------------------------*/
+
+#define MP1 (M+1)
+
+/*----------------------------------------------------------------------------
+; 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 interpolate_isp(
+    int16 isp_old[],       /* input : isps from past frame              */
+    int16 isp_new[],       /* input : isps from present frame           */
+    const int16 frac[],    /* input : fraction for 3 first subfr (Q15)  */
+    int16 Az[]             /* output: LP coefficients in 4 subframes    */
+)
+{
+    int16 i, k, fac_old, fac_new;
+    int16 isp[M];
+    int32 L_tmp;
+
+    for (k = 0; k < 3; k++)
+    {
+        fac_new = frac[k];
+        fac_old = add_int16(sub_int16(32767, fac_new), 1);  /* 1.0 - fac_new */
+
+        for (i = 0; i < M; i++)
+        {
+            L_tmp = mul_16by16_to_int32(isp_old[i], fac_old);
+            L_tmp = mac_16by16_to_int32(L_tmp, isp_new[i], fac_new);
+            isp[i] = amr_wb_round(L_tmp);
+        }
+        Isp_Az(isp, Az, M, 0);
+        Az += MP1;
+    }
+
+    /* 4th subframe: isp_new (frac=1.0) */
+
+    Isp_Az(isp_new, Az, M, 0);
+
+    return;
+}