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: voice_factor.cpp 35 36 Date: 05/08/2007 37 38 ------------------------------------------------------------------------------ 39 REVISION HISTORY 40 41 42 Description: 43 44 ------------------------------------------------------------------------------ 45 INPUT AND OUTPUT DEFINITIONS 46 47 int16 exc[], (i) Q_exc : pitch excitation 48 int16 Q_exc, (i) : exc format 49 int16 gain_pit, (i) Q14 : gain of pitch 50 int16 code[], (i) Q9 : Fixed codebook excitation 51 int16 gain_code, (i) Q0 : gain of code 52 int16 L_subfr (i) : subframe length 53 54 ------------------------------------------------------------------------------ 55 FUNCTION DESCRIPTION 56 57 Find the voicing factor (1=voice to -1=unvoiced). 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 "pvamrwb_math_op.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 /*---------------------------------------------------------------------------- 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 ----------------------------------------------------------------------------*/ 103 104 /*---------------------------------------------------------------------------- 105 ; EXTERNAL FUNCTION REFERENCES 106 ; Declare functions defined elsewhere and referenced in this module 107 ----------------------------------------------------------------------------*/ 108 109 /*---------------------------------------------------------------------------- 110 ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES 111 ; Declare variables used in this module but defined elsewhere 112 ----------------------------------------------------------------------------*/ 113 114 /*---------------------------------------------------------------------------- 115 ; FUNCTION CODE 116 ----------------------------------------------------------------------------*/ 117 118 int16 voice_factor( /* (o) Q15 : factor (-1=unvoiced to 1=voiced) */ 119 int16 exc[], /* (i) Q_exc : pitch excitation */ 120 int16 Q_exc, /* (i) : exc format */ 121 int16 gain_pit, /* (i) Q14 : gain of pitch */ 122 int16 code[], /* (i) Q9 : Fixed codebook excitation */ 123 int16 gain_code, /* (i) Q0 : gain of code */ 124 int16 L_subfr /* (i) : subframe length */ 125 ) 126 { 127 int16 i, tmp, exp, ener1, exp1, ener2, exp2; 128 int32 L_tmp; 129 130 ener1 = extract_h(Dot_product12(exc, exc, L_subfr, &exp1)); 131 exp1 = sub_int16(exp1, Q_exc << 1); 132 L_tmp = mul_16by16_to_int32(gain_pit, gain_pit); 133 exp = normalize_amr_wb(L_tmp); 134 135 tmp = (int16)((L_tmp << exp) >> 16); 136 ener1 = mult_int16(ener1, tmp); 137 exp1 -= (exp + 10); /* 10 -> gain_pit Q14 to Q9 */ 138 139 ener2 = extract_h(Dot_product12(code, code, L_subfr, &exp2)); 140 141 exp = norm_s(gain_code); 142 tmp = shl_int16(gain_code, exp); 143 tmp = mult_int16(tmp, tmp); 144 ener2 = mult_int16(ener2, tmp); 145 exp2 -= (exp << 1); 146 147 i = exp1 - exp2; 148 149 150 if (i >= 0) 151 { 152 ener1 >>= 1; 153 ener2 >>= (i + 1); 154 } 155 else 156 { 157 ener1 >>= (1 - i); 158 ener2 >>= 1; 159 } 160 161 tmp = ener1 - ener2; 162 ener1 += ener2 + 1; 163 164 165 if (tmp >= 0) 166 { 167 tmp = div_16by16(tmp, ener1); 168 } 169 else 170 { 171 tmp = negate_int16(div_16by16(negate_int16(tmp), ener1)); 172 } 173 174 return (tmp); 175 } 176
