1 /* 2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 /* encode.c - Encoding function for the iSAC coder */ 12 13 #include "structs.h" 14 #include "codec.h" 15 #include "pitch_estimator.h" 16 17 #include <math.h> 18 19 void WebRtcIsac_InitMasking(MaskFiltstr *maskdata) { 20 21 int k; 22 23 for (k = 0; k < WINLEN; k++) { 24 maskdata->DataBufferLo[k] = 0.0; 25 maskdata->DataBufferHi[k] = 0.0; 26 } 27 for (k = 0; k < ORDERLO+1; k++) { 28 maskdata->CorrBufLo[k] = 0.0; 29 maskdata->PreStateLoF[k] = 0.0; 30 maskdata->PreStateLoG[k] = 0.0; 31 maskdata->PostStateLoF[k] = 0.0; 32 maskdata->PostStateLoG[k] = 0.0; 33 } 34 for (k = 0; k < ORDERHI+1; k++) { 35 maskdata->CorrBufHi[k] = 0.0; 36 maskdata->PreStateHiF[k] = 0.0; 37 maskdata->PreStateHiG[k] = 0.0; 38 maskdata->PostStateHiF[k] = 0.0; 39 maskdata->PostStateHiG[k] = 0.0; 40 } 41 42 maskdata->OldEnergy = 10.0; 43 return; 44 } 45 46 void WebRtcIsac_InitPreFilterbank(PreFiltBankstr *prefiltdata) 47 { 48 int k; 49 50 for (k = 0; k < QLOOKAHEAD; k++) { 51 prefiltdata->INLABUF1[k] = 0; 52 prefiltdata->INLABUF2[k] = 0; 53 54 prefiltdata->INLABUF1_float[k] = 0; 55 prefiltdata->INLABUF2_float[k] = 0; 56 } 57 for (k = 0; k < 2*(QORDER-1); k++) { 58 prefiltdata->INSTAT1[k] = 0; 59 prefiltdata->INSTAT2[k] = 0; 60 prefiltdata->INSTATLA1[k] = 0; 61 prefiltdata->INSTATLA2[k] = 0; 62 63 prefiltdata->INSTAT1_float[k] = 0; 64 prefiltdata->INSTAT2_float[k] = 0; 65 prefiltdata->INSTATLA1_float[k] = 0; 66 prefiltdata->INSTATLA2_float[k] = 0; 67 } 68 69 /* High pass filter states */ 70 prefiltdata->HPstates[0] = 0.0; 71 prefiltdata->HPstates[1] = 0.0; 72 73 prefiltdata->HPstates_float[0] = 0.0f; 74 prefiltdata->HPstates_float[1] = 0.0f; 75 76 return; 77 } 78 79 void WebRtcIsac_InitPostFilterbank(PostFiltBankstr *postfiltdata) 80 { 81 int k; 82 83 for (k = 0; k < 2*POSTQORDER; k++) { 84 postfiltdata->STATE_0_LOWER[k] = 0; 85 postfiltdata->STATE_0_UPPER[k] = 0; 86 87 postfiltdata->STATE_0_LOWER_float[k] = 0; 88 postfiltdata->STATE_0_UPPER_float[k] = 0; 89 } 90 91 /* High pass filter states */ 92 postfiltdata->HPstates1[0] = 0.0; 93 postfiltdata->HPstates1[1] = 0.0; 94 95 postfiltdata->HPstates2[0] = 0.0; 96 postfiltdata->HPstates2[1] = 0.0; 97 98 postfiltdata->HPstates1_float[0] = 0.0f; 99 postfiltdata->HPstates1_float[1] = 0.0f; 100 101 postfiltdata->HPstates2_float[0] = 0.0f; 102 postfiltdata->HPstates2_float[1] = 0.0f; 103 104 return; 105 } 106 107 108 void WebRtcIsac_InitPitchFilter(PitchFiltstr *pitchfiltdata) 109 { 110 int k; 111 112 for (k = 0; k < PITCH_BUFFSIZE; k++) { 113 pitchfiltdata->ubuf[k] = 0.0; 114 } 115 pitchfiltdata->ystate[0] = 0.0; 116 for (k = 1; k < (PITCH_DAMPORDER); k++) { 117 pitchfiltdata->ystate[k] = 0.0; 118 } 119 pitchfiltdata->oldlagp[0] = 50.0; 120 pitchfiltdata->oldgainp[0] = 0.0; 121 } 122 123 void WebRtcIsac_InitWeightingFilter(WeightFiltstr *wfdata) 124 { 125 int k; 126 double t, dtmp, dtmp2, denum, denum2; 127 128 for (k=0;k<PITCH_WLPCBUFLEN;k++) 129 wfdata->buffer[k]=0.0; 130 131 for (k=0;k<PITCH_WLPCORDER;k++) { 132 wfdata->istate[k]=0.0; 133 wfdata->weostate[k]=0.0; 134 wfdata->whostate[k]=0.0; 135 } 136 137 /* next part should be in Matlab, writing to a global table */ 138 t = 0.5; 139 denum = 1.0 / ((double) PITCH_WLPCWINLEN); 140 denum2 = denum * denum; 141 for (k=0;k<PITCH_WLPCWINLEN;k++) { 142 dtmp = PITCH_WLPCASYM * t * denum + (1-PITCH_WLPCASYM) * t * t * denum2; 143 dtmp *= 3.14159265; 144 dtmp2 = sin(dtmp); 145 wfdata->window[k] = dtmp2 * dtmp2; 146 t++; 147 } 148 } 149 150 /* clear all buffers */ 151 void WebRtcIsac_InitPitchAnalysis(PitchAnalysisStruct *State) 152 { 153 int k; 154 155 for (k = 0; k < PITCH_CORR_LEN2+PITCH_CORR_STEP2+PITCH_MAX_LAG/2-PITCH_FRAME_LEN/2+2; k++) 156 State->dec_buffer[k] = 0.0; 157 for (k = 0; k < 2*ALLPASSSECTIONS+1; k++) 158 State->decimator_state[k] = 0.0; 159 for (k = 0; k < 2; k++) 160 State->hp_state[k] = 0.0; 161 for (k = 0; k < QLOOKAHEAD; k++) 162 State->whitened_buf[k] = 0.0; 163 for (k = 0; k < QLOOKAHEAD; k++) 164 State->inbuf[k] = 0.0; 165 166 WebRtcIsac_InitPitchFilter(&(State->PFstr_wght)); 167 168 WebRtcIsac_InitPitchFilter(&(State->PFstr)); 169 170 WebRtcIsac_InitWeightingFilter(&(State->Wghtstr)); 171 } 172
