14f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/* ------------------------------------------------------------------ 24f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * Copyright (C) 1998-2009 PacketVideo 34f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * 44f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * Licensed under the Apache License, Version 2.0 (the "License"); 54f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * you may not use this file except in compliance with the License. 64f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * You may obtain a copy of the License at 74f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * 84f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * http://www.apache.org/licenses/LICENSE-2.0 94f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * 104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * Unless required by applicable law or agreed to in writing, software 114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * distributed under the License is distributed on an "AS IS" BASIS, 124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * express or implied. 144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * See the License for the specific language governing permissions 154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * and limitations under the License. 164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * ------------------------------------------------------------------- 174f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber */ 184f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/**************************************************************************************** 194f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas HuberPortions of this file are derived from the following 3GPP standard: 204f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 214f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3GPP TS 26.173 224f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ANSI-C code for the Adaptive Multi-Rate - Wideband (AMR-WB) speech codec 234f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Available from http://www.3gpp.org 244f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 254f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber(C) 2007, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC) 264f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas HuberPermission to distribute, modify and use this file under the standard license 274f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huberterms listed above has been obtained from the copyright holder. 284f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber****************************************************************************************/ 294f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/* 304f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Filename: isf_extrapolation.cpp 354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Date: 05/08/2007 374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REVISION HISTORY 404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: 434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber INPUT AND OUTPUT DEFINITIONS 464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber int16 HfIsf[] (i/o) isf vector 484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber FUNCTION DESCRIPTION 514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Conversion of 16th-order 12.8kHz ISF vector 534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber into 20th-order 16kHz ISF vector 544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REQUIREMENTS 574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 594f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 604f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REFERENCES 614f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 624f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 634f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber PSEUDO-CODE 644f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 654f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 664f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber*/ 674f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 684f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 694f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 704f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; INCLUDES 714f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 724f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 734f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include "pv_amr_wb_type_defs.h" 744f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include "pvamrwbdecoder_basic_op.h" 754f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include "pvamrwbdecoder_cnst.h" 764f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include "pvamrwbdecoder_acelp.h" 774f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include "pvamrwb_math_op.h" 784f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 794f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 804f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; MACROS 814f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; Define module specific macros here 824f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 834f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 844f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 854f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 864f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; DEFINES 874f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; Include all pre-processor statements here. Include conditional 884f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; compile variables also. 894f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 904f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#define INV_LENGTH 2731 /* 1/12 */ 914f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 924f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 934f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; LOCAL FUNCTION DEFINITIONS 944f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; Function Prototype declaration 954f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 964f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 974f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 984f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; LOCAL STORE/BUFFER/POINTER DEFINITIONS 994f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; Variable declaration - defined here and used outside this module 1004f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 1014f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1024f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 1034f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; EXTERNAL FUNCTION REFERENCES 1044f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; Declare functions defined elsewhere and referenced in this module 1054f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 1064f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1074f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 1084f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES 1094f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; Declare variables used in this module but defined elsewhere 1104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 1114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 1134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; FUNCTION CODE 1144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 1154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1174f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Hubervoid isf_extrapolation(int16 HfIsf[]) 1184f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber{ 1194f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber int16 IsfDiff[M - 2]; 1204f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber int32 IsfCorr[3]; 1214f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber int32 L_tmp; 1224f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber int16 coeff, mean, tmp, tmp2, tmp3; 1234f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber int16 exp, exp2, hi, lo; 1244f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber int16 i, MaxCorr; 1254f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1264f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber HfIsf[M16k - 1] = HfIsf[M - 1]; 1274f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1284f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* Difference vector */ 1294f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 1; i < (M - 1); i++) 1304f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber IsfDiff[i - 1] = sub_int16(HfIsf[i], HfIsf[i - 1]); 1324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber L_tmp = 0; 1344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* Mean of difference vector */ 1364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 3; i < (M - 1); i++) 1374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber L_tmp = mac_16by16_to_int32(L_tmp, IsfDiff[i - 1], INV_LENGTH); 1394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber mean = amr_wb_round(L_tmp); 1424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber IsfCorr[0] = 0; 1444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber tmp = 0; 1464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 0; i < (M - 2); i++) 1474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (IsfDiff[i] > tmp) 1494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber tmp = IsfDiff[i]; 1514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber exp = norm_s(tmp); 1544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 0; i < (M - 2); i++) 1554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber IsfDiff[i] = shl_int16(IsfDiff[i], exp); 1574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber mean = shl_int16(mean, exp); 1594f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 7; i < (M - 2); i++) 1604f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1614f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber tmp2 = sub_int16(IsfDiff[i], mean); 1624f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber tmp3 = sub_int16(IsfDiff[i - 2], mean); 1634f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber L_tmp = mul_16by16_to_int32(tmp2, tmp3); 1644f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber int32_to_dpf(L_tmp, &hi, &lo); 1654f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber L_tmp = mpy_dpf_32(hi, lo, hi, lo); 1664f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber IsfCorr[0] = add_int32(IsfCorr[0], L_tmp); 1674f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1684f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber IsfCorr[1] = 0; 1694f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 7; i < (M - 2); i++) 1704f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1714f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber tmp2 = sub_int16(IsfDiff[i], mean); 1724f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber tmp3 = sub_int16(IsfDiff[i - 3], mean); 1734f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber L_tmp = mul_16by16_to_int32(tmp2, tmp3); 1744f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber int32_to_dpf(L_tmp, &hi, &lo); 1754f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber L_tmp = mpy_dpf_32(hi, lo, hi, lo); 1764f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber IsfCorr[1] = add_int32(IsfCorr[1], L_tmp); 1774f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1784f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber IsfCorr[2] = 0; 1794f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 7; i < (M - 2); i++) 1804f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1814f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber tmp2 = sub_int16(IsfDiff[i], mean); 1824f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber tmp3 = sub_int16(IsfDiff[i - 4], mean); 1834f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber L_tmp = mul_16by16_to_int32(tmp2, tmp3); 1844f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber int32_to_dpf(L_tmp, &hi, &lo); 1854f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber L_tmp = mpy_dpf_32(hi, lo, hi, lo); 1864f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber IsfCorr[2] = add_int32(IsfCorr[2], L_tmp); 1874f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1884f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1894f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (IsfCorr[0] > IsfCorr[1]) 1904f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1914f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber MaxCorr = 0; 1924f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1934f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 1944f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1954f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber MaxCorr = 1; 1964f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1974f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1984f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1994f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (IsfCorr[2] > IsfCorr[MaxCorr]) 2004f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2014f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber MaxCorr = 2; 2024f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2034f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2044f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber MaxCorr++; /* Maximum correlation of difference vector */ 2054f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2064f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = M - 1; i < (M16k - 1); i++) 2074f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2084f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber tmp = sub_int16(HfIsf[i - 1 - MaxCorr], HfIsf[i - 2 - MaxCorr]); 2094f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber HfIsf[i] = add_int16(HfIsf[i - 1], tmp); 2104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* tmp=7965+(HfIsf[2]-HfIsf[3]-HfIsf[4])/6; */ 2134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber tmp = add_int16(HfIsf[4], HfIsf[3]); 2144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber tmp = sub_int16(HfIsf[2], tmp); 2154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber tmp = mult_int16(tmp, 5461); 2164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber tmp += 20390; 2174f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2184f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2194f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (tmp > 19456) 2204f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { /* Maximum value of ISF should be at most 7600 Hz */ 2214f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber tmp = 19456; 2224f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2234f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber tmp = sub_int16(tmp, HfIsf[M - 2]); 2244f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber tmp2 = sub_int16(HfIsf[M16k - 2], HfIsf[M - 2]); 2254f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2264f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber exp2 = norm_s(tmp2); 2274f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber exp = norm_s(tmp); 2284f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber exp--; 2294f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber tmp <<= exp; 2304f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber tmp2 <<= exp2; 2314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber coeff = div_16by16(tmp, tmp2); /* Coefficient for stretching the ISF vector */ 2324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber exp = exp2 - exp; 2334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = M - 1; i < (M16k - 1); i++) 2354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber tmp = mult_int16(sub_int16(HfIsf[i], HfIsf[i - 1]), coeff); 2374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber IsfDiff[i - (M - 1)] = shl_int16(tmp, exp); 2384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = M; i < (M16k - 1); i++) 2414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* The difference between ISF(n) and ISF(n-2) should be at least 500 Hz */ 2434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber tmp = IsfDiff[i - (M - 1)] + IsfDiff[i - M] - 1280; 2444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (tmp < 0) 2464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (IsfDiff[i - (M - 1)] > IsfDiff[i - M]) 2494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber IsfDiff[i - M] = 1280 - IsfDiff[i - (M - 1)]; 2514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 2534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber IsfDiff[i - (M - 1)] = 1280 - IsfDiff[i - M]; 2554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2594f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = M - 1; i < (M16k - 1); i++) 2604f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2614f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber HfIsf[i] = add_int16(HfIsf[i - 1], IsfDiff[i - (M - 1)]); 2624f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2634f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2644f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 0; i < (M16k - 1); i++) 2654f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2664f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber HfIsf[i] = mult_int16(HfIsf[i], 26214); /* Scale the ISF vector correctly for 16000 kHz */ 2674f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2684f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2694f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Isf_isp(HfIsf, HfIsf, M16k); 2704f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2714f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber return; 2724f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber} 2734f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2744f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 275