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: low_pass_filt_7k.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 signal[], input signal / output is divided by 16 48 int16 lg, lenght of signal 49 int16 mem[] in/out: memory (size=30) 50 int16 x[] scratch mem ( size= 60) 51 52 ------------------------------------------------------------------------------ 53 FUNCTION DESCRIPTION 54 55 15th order high pass 7kHz FIR filter 56 57 58 ------------------------------------------------------------------------------ 59 REQUIREMENTS 60 61 62 ------------------------------------------------------------------------------ 63 REFERENCES 64 65 ------------------------------------------------------------------------------ 66 PSEUDO-CODE 67 68 ------------------------------------------------------------------------------ 69 */ 70 71 72 /*---------------------------------------------------------------------------- 73 ; INCLUDES 74 ----------------------------------------------------------------------------*/ 75 76 #include "pv_amr_wb_type_defs.h" 77 #include "pvamrwbdecoder_basic_op.h" 78 #include "pvamrwbdecoder_cnst.h" 79 #include "pvamrwbdecoder_acelp.h" 80 81 /*---------------------------------------------------------------------------- 82 ; MACROS 83 ; Define module specific macros here 84 ----------------------------------------------------------------------------*/ 85 86 87 /*---------------------------------------------------------------------------- 88 ; DEFINES 89 ; Include all pre-processor statements here. Include conditional 90 ; compile variables also. 91 ----------------------------------------------------------------------------*/ 92 #define L_FIR 30 93 94 /*---------------------------------------------------------------------------- 95 ; LOCAL FUNCTION DEFINITIONS 96 ; Function Prototype declaration 97 ----------------------------------------------------------------------------*/ 98 99 /*---------------------------------------------------------------------------- 100 ; LOCAL STORE/BUFFER/POINTER DEFINITIONS 101 ; Variable declaration - defined here and used outside this module 102 ----------------------------------------------------------------------------*/ 103 const int16 fir_7k[L_FIR+1] = 104 { 105 -21, 47, -89, 146, -203, 106 229, -177, 0, 335, -839, 107 1485, -2211, 2931, -3542, 3953, 108 28682, 3953, -3542, 2931, -2211, 109 1485, -839, 335, 0, -177, 110 229, -203, 146, -89, 47, 111 -21 112 }; 113 114 /*---------------------------------------------------------------------------- 115 ; EXTERNAL FUNCTION REFERENCES 116 ; Declare functions defined elsewhere and referenced in this module 117 ----------------------------------------------------------------------------*/ 118 119 /*---------------------------------------------------------------------------- 120 ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES 121 ; Declare variables used in this module but defined elsewhere 122 ----------------------------------------------------------------------------*/ 123 124 /*---------------------------------------------------------------------------- 125 ; FUNCTION CODE 126 ----------------------------------------------------------------------------*/ 127 128 129 void low_pass_filt_7k_init(int16 mem[]) /* mem[30] */ 130 { 131 pv_memset((void *)mem, 0, (L_FIR)*sizeof(*mem)); 132 133 return; 134 } 135 136 137 /*---------------------------------------------------------------------------- 138 ; FUNCTION CODE 139 ----------------------------------------------------------------------------*/ 140 141 142 void low_pass_filt_7k( 143 int16 signal[], /* input: signal */ 144 int16 lg, /* input: length of input */ 145 int16 mem[], /* in/out: memory (size=30) */ 146 int16 x[] 147 ) 148 { 149 int16 i, j; 150 int32 L_tmp1; 151 int32 L_tmp2; 152 int32 L_tmp3; 153 int32 L_tmp4; 154 155 pv_memcpy((void *)x, (void *)mem, (L_FIR)*sizeof(*x)); 156 157 for (i = 0; i < lg >> 2; i++) 158 { 159 x[(i<<2) + L_FIR ] = signal[(i<<2)]; 160 x[(i<<2) + L_FIR + 1] = signal[(i<<2)+1]; 161 x[(i<<2) + L_FIR + 2] = signal[(i<<2)+2]; 162 x[(i<<2) + L_FIR + 3] = signal[(i<<2)+3]; 163 164 L_tmp1 = fxp_mac_16by16(x[(i<<2)] + signal[(i<<2)], fir_7k[0], 0x00004000); 165 L_tmp2 = fxp_mac_16by16(x[(i<<2)+1] + signal[(i<<2)+1], fir_7k[0], 0x00004000); 166 L_tmp3 = fxp_mac_16by16(x[(i<<2)+2] + signal[(i<<2)+2], fir_7k[0], 0x00004000); 167 L_tmp4 = fxp_mac_16by16(x[(i<<2)+3] + signal[(i<<2)+3], fir_7k[0], 0x00004000); 168 169 for (j = 1; j < L_FIR - 1; j += 4) 170 { 171 172 173 int16 tmp1 = x[(i<<2)+j ]; 174 int16 tmp2 = x[(i<<2)+j+1]; 175 int16 tmp3 = x[(i<<2)+j+2]; 176 177 L_tmp1 = fxp_mac_16by16(tmp1, fir_7k[j ], L_tmp1); 178 L_tmp2 = fxp_mac_16by16(tmp2, fir_7k[j ], L_tmp2); 179 L_tmp1 = fxp_mac_16by16(tmp2, fir_7k[j+1], L_tmp1); 180 L_tmp2 = fxp_mac_16by16(tmp3, fir_7k[j+1], L_tmp2); 181 L_tmp3 = fxp_mac_16by16(tmp3, fir_7k[j ], L_tmp3); 182 L_tmp1 = fxp_mac_16by16(tmp3, fir_7k[j+2], L_tmp1); 183 184 tmp1 = x[(i<<2)+j+3]; 185 tmp2 = x[(i<<2)+j+4]; 186 187 L_tmp2 = fxp_mac_16by16(tmp1, fir_7k[j+2], L_tmp2); 188 L_tmp4 = fxp_mac_16by16(tmp1, fir_7k[j ], L_tmp4); 189 L_tmp3 = fxp_mac_16by16(tmp1, fir_7k[j+1], L_tmp3); 190 L_tmp1 = fxp_mac_16by16(tmp1, fir_7k[j+3], L_tmp1); 191 L_tmp2 = fxp_mac_16by16(tmp2, fir_7k[j+3], L_tmp2); 192 L_tmp4 = fxp_mac_16by16(tmp2, fir_7k[j+1], L_tmp4); 193 L_tmp3 = fxp_mac_16by16(tmp2, fir_7k[j+2], L_tmp3); 194 195 tmp1 = x[(i<<2)+j+5]; 196 tmp2 = x[(i<<2)+j+6]; 197 198 L_tmp4 = fxp_mac_16by16(tmp1, fir_7k[j+2], L_tmp4); 199 L_tmp3 = fxp_mac_16by16(tmp1, fir_7k[j+3], L_tmp3); 200 L_tmp4 = fxp_mac_16by16(tmp2, fir_7k[j+3], L_tmp4); 201 202 } 203 204 L_tmp1 = fxp_mac_16by16(x[(i<<2)+j ], fir_7k[j ], L_tmp1); 205 L_tmp2 = fxp_mac_16by16(x[(i<<2)+j+1], fir_7k[j ], L_tmp2); 206 L_tmp3 = fxp_mac_16by16(x[(i<<2)+j+2], fir_7k[j ], L_tmp3); 207 L_tmp4 = fxp_mac_16by16(x[(i<<2)+j+3], fir_7k[j ], L_tmp4); 208 209 signal[(i<<2)] = (int16)(L_tmp1 >> 15); 210 signal[(i<<2)+1] = (int16)(L_tmp2 >> 15); 211 signal[(i<<2)+2] = (int16)(L_tmp3 >> 15); 212 signal[(i<<2)+3] = (int16)(L_tmp4 >> 15); 213 214 } 215 216 pv_memcpy((void *)mem, (void *)(x + lg), (L_FIR)*sizeof(*mem)); 217 218 return; 219 } 220 221
