1 /* ------------------------------------------------------------------ 2 * Copyright (C) 1998-2009 PacketVideo 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 13 * express or implied. 14 * See the License for the specific language governing permissions 15 * and limitations under the License. 16 * ------------------------------------------------------------------- 17 */ 18 /**************************************************************************************** 19 Portions of this file are derived from the following 3GPP standard: 20 21 3GPP TS 26.173 22 ANSI-C code for the Adaptive Multi-Rate - Wideband (AMR-WB) speech codec 23 Available from http://www.3gpp.org 24 25 (C) 2007, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC) 26 Permission to distribute, modify and use this file under the standard license 27 terms listed above has been obtained from the copyright holder. 28 ****************************************************************************************/ 29 /* 30 ------------------------------------------------------------------------------ 31 32 33 34 Filename: interpolate_isp.cpp 35 36 Date: 05/08/2004 37 38 ------------------------------------------------------------------------------ 39 REVISION HISTORY 40 41 42 Description: 43 44 ------------------------------------------------------------------------------ 45 INPUT AND OUTPUT DEFINITIONS 46 47 int16 isp_old[], input : isps from past frame 48 int16 isp_new[], input : isps from present frame 49 const int16 frac[], input : fraction for 3 first subfr (Q15) 50 int16 Az[] output: LP coefficients in 4 subframes 51 52 53 ------------------------------------------------------------------------------ 54 FUNCTION DESCRIPTION 55 56 Interpolation of the LP parameters in 4 subframes 57 58 59 ------------------------------------------------------------------------------ 60 REQUIREMENTS 61 62 63 ------------------------------------------------------------------------------ 64 REFERENCES 65 66 ------------------------------------------------------------------------------ 67 PSEUDO-CODE 68 69 ------------------------------------------------------------------------------ 70 */ 71 72 73 /*---------------------------------------------------------------------------- 74 ; INCLUDES 75 ----------------------------------------------------------------------------*/ 76 77 #include "pv_amr_wb_type_defs.h" 78 #include "pvamrwbdecoder_basic_op.h" 79 #include "pvamrwbdecoder_cnst.h" 80 #include "pvamrwbdecoder_acelp.h" 81 82 /*---------------------------------------------------------------------------- 83 ; MACROS 84 ; Define module specific macros here 85 ----------------------------------------------------------------------------*/ 86 87 88 /*---------------------------------------------------------------------------- 89 ; DEFINES 90 ; Include all pre-processor statements here. Include conditional 91 ; compile variables also. 92 ----------------------------------------------------------------------------*/ 93 94 #define MP1 (M+1) 95 96 /*---------------------------------------------------------------------------- 97 ; LOCAL STORE/BUFFER/POINTER DEFINITIONS 98 ; Variable declaration - defined here and used outside this module 99 ----------------------------------------------------------------------------*/ 100 101 /*---------------------------------------------------------------------------- 102 ; EXTERNAL FUNCTION REFERENCES 103 ; Declare functions defined elsewhere and referenced in this module 104 ----------------------------------------------------------------------------*/ 105 106 /*---------------------------------------------------------------------------- 107 ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES 108 ; Declare variables used in this module but defined elsewhere 109 ----------------------------------------------------------------------------*/ 110 111 /*---------------------------------------------------------------------------- 112 ; FUNCTION CODE 113 ----------------------------------------------------------------------------*/ 114 115 void interpolate_isp( 116 int16 isp_old[], /* input : isps from past frame */ 117 int16 isp_new[], /* input : isps from present frame */ 118 const int16 frac[], /* input : fraction for 3 first subfr (Q15) */ 119 int16 Az[] /* output: LP coefficients in 4 subframes */ 120 ) 121 { 122 int16 i, k, fac_old, fac_new; 123 int16 isp[M]; 124 int32 L_tmp; 125 126 for (k = 0; k < 3; k++) 127 { 128 fac_new = frac[k]; 129 fac_old = add_int16(sub_int16(32767, fac_new), 1); /* 1.0 - fac_new */ 130 131 for (i = 0; i < M; i++) 132 { 133 L_tmp = mul_16by16_to_int32(isp_old[i], fac_old); 134 L_tmp = mac_16by16_to_int32(L_tmp, isp_new[i], fac_new); 135 isp[i] = amr_wb_round(L_tmp); 136 } 137 Isp_Az(isp, Az, M, 0); 138 Az += MP1; 139 } 140 141 /* 4th subframe: isp_new (frac=1.0) */ 142 143 Isp_Az(isp_new, Az, M, 0); 144 145 return; 146 } 147
