1 /*
2 * Copyright (C) 2004-2010 NXP Software
3 * Copyright (C) 2010 The Android Open Source Project
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 #include "BIQUAD.h"
19 #include "BQ_2I_D16F32Css_TRC_WRA_01_Private.h"
20 #include "LVM_Macros.h"
21
22 /**************************************************************************
23 ASSUMPTIONS:
24 COEFS-
25 pBiquadState->coefs[0] is A2, pBiquadState->coefs[1] is A1
26 pBiquadState->coefs[2] is A0, pBiquadState->coefs[3] is -B2
27 pBiquadState->coefs[4] is -B1, these are in Q15 format
28
29 DELAYS-
30 pBiquadState->pDelays[0] is x(n-1)L in Q0 format
31 pBiquadState->pDelays[1] is x(n-1)R in Q0 format
32 pBiquadState->pDelays[2] is x(n-2)L in Q0 format
33 pBiquadState->pDelays[3] is x(n-2)R in Q0 format
34 pBiquadState->pDelays[4] is y(n-1)L in Q16 format
35 pBiquadState->pDelays[5] is y(n-1)R in Q16 format
36 pBiquadState->pDelays[6] is y(n-2)L in Q16 format
37 pBiquadState->pDelays[7] is y(n-2)R in Q16 format
38 ***************************************************************************/
39 #ifdef BUILD_FLOAT
BQ_2I_D16F32C15_TRC_WRA_01(Biquad_FLOAT_Instance_t * pInstance,LVM_FLOAT * pDataIn,LVM_FLOAT * pDataOut,LVM_INT16 NrSamples)40 void BQ_2I_D16F32C15_TRC_WRA_01 ( Biquad_FLOAT_Instance_t *pInstance,
41 LVM_FLOAT *pDataIn,
42 LVM_FLOAT *pDataOut,
43 LVM_INT16 NrSamples)
44 {
45 LVM_FLOAT ynL,ynR;
46 LVM_INT16 ii;
47 PFilter_State_FLOAT pBiquadState = (PFilter_State_FLOAT) pInstance;
48
49 for (ii = NrSamples; ii != 0; ii--)
50 {
51
52
53 /**************************************************************************
54 PROCESSING OF THE LEFT CHANNEL
55 ***************************************************************************/
56 /* ynL=A2 * x(n-2)L */
57 ynL = (LVM_FLOAT)pBiquadState->coefs[0] * pBiquadState->pDelays[2];
58
59 /* ynL+=A1 * x(n-1)L */
60 ynL += (LVM_FLOAT)pBiquadState->coefs[1] * pBiquadState->pDelays[0];
61
62 /* ynL+=A0 * x(n)L */
63 ynL += (LVM_FLOAT)pBiquadState->coefs[2] * (*pDataIn);
64
65 /* ynL+= ( (-B2 * y(n-2)L ) */
66 ynL += pBiquadState->pDelays[6] * pBiquadState->coefs[3];
67
68
69 /* ynL+=( (-B1 * y(n-1)L )) */
70 ynL += pBiquadState->pDelays[4] * pBiquadState->coefs[4];
71
72
73 /**************************************************************************
74 PROCESSING OF THE RIGHT CHANNEL
75 ***************************************************************************/
76 /* ynR=A2 * x(n-2)R */
77 ynR = (LVM_FLOAT)pBiquadState->coefs[0] * pBiquadState->pDelays[3];
78
79 /* ynR+=A1 * x(n-1)R */
80 ynR += (LVM_FLOAT)pBiquadState->coefs[1] * pBiquadState->pDelays[1];
81
82 /* ynR+=A0 * x(n)R */
83 ynR += (LVM_FLOAT)pBiquadState->coefs[2] * (*(pDataIn+1));
84
85 /* ynR+= ( (-B2 * y(n-2)R ) */
86 ynR += pBiquadState->pDelays[7] * pBiquadState->coefs[3];
87
88
89 /* ynR+=( (-B1 * y(n-1)R )) in Q15 */
90 ynR += pBiquadState->pDelays[5] * pBiquadState->coefs[4];
91
92 /**************************************************************************
93 UPDATING THE DELAYS
94 ***************************************************************************/
95 pBiquadState->pDelays[7] = pBiquadState->pDelays[5]; /* y(n-2)R=y(n-1)R*/
96 pBiquadState->pDelays[6] = pBiquadState->pDelays[4]; /* y(n-2)L=y(n-1)L*/
97 pBiquadState->pDelays[3] = pBiquadState->pDelays[1]; /* x(n-2)R=x(n-1)R*/
98 pBiquadState->pDelays[2] = pBiquadState->pDelays[0]; /* x(n-2)L=x(n-1)L*/
99 pBiquadState->pDelays[5] = ynR; /* Update y(n-1)R*/
100 pBiquadState->pDelays[4] = ynL; /* Update y(n-1)L*/
101 pBiquadState->pDelays[0] = (*pDataIn); /* Update x(n-1)L*/
102 pDataIn++;
103 pBiquadState->pDelays[1] = (*pDataIn); /* Update x(n-1)R*/
104 pDataIn++;
105
106 /**************************************************************************
107 WRITING THE OUTPUT
108 ***************************************************************************/
109 *pDataOut = (LVM_FLOAT)(ynL); /* Write Left output*/
110 pDataOut++;
111 *pDataOut = (LVM_FLOAT)(ynR); /* Write Right ouput*/
112 pDataOut++;
113 }
114
115 }
116 #else
BQ_2I_D16F32C15_TRC_WRA_01(Biquad_Instance_t * pInstance,LVM_INT16 * pDataIn,LVM_INT16 * pDataOut,LVM_INT16 NrSamples)117 void BQ_2I_D16F32C15_TRC_WRA_01 ( Biquad_Instance_t *pInstance,
118 LVM_INT16 *pDataIn,
119 LVM_INT16 *pDataOut,
120 LVM_INT16 NrSamples)
121 {
122 LVM_INT32 ynL,ynR,templ;
123 LVM_INT16 ii;
124 PFilter_State pBiquadState = (PFilter_State) pInstance;
125
126 for (ii = NrSamples; ii != 0; ii--)
127 {
128
129
130 /**************************************************************************
131 PROCESSING OF THE LEFT CHANNEL
132 ***************************************************************************/
133 /* ynL=A2 (Q15) * x(n-2)L (Q0) in Q15*/
134 ynL=(LVM_INT32)pBiquadState->coefs[0]* pBiquadState->pDelays[2];
135
136 /* ynL+=A1 (Q15) * x(n-1)L (Q0) in Q15*/
137 ynL+=(LVM_INT32)pBiquadState->coefs[1]* pBiquadState->pDelays[0];
138
139 /* ynL+=A0 (Q15) * x(n)L (Q0) in Q15*/
140 ynL+=(LVM_INT32)pBiquadState->coefs[2]* (*pDataIn);
141
142 /* ynL+= ( (-B2 (Q15) * y(n-2)L (Q16) )>>16) in Q15 */
143 MUL32x16INTO32(pBiquadState->pDelays[6],pBiquadState->coefs[3],templ,16)
144 ynL+=templ;
145
146 /* ynL+=( (-B1 (Q15) * y(n-1)L (Q16) )>>16) in Q15 */
147 MUL32x16INTO32(pBiquadState->pDelays[4],pBiquadState->coefs[4],templ,16)
148 ynL+=templ;
149
150 /**************************************************************************
151 PROCESSING OF THE RIGHT CHANNEL
152 ***************************************************************************/
153 /* ynR=A2 (Q15) * x(n-2)R (Q0) in Q15*/
154 ynR=(LVM_INT32)pBiquadState->coefs[0]*pBiquadState->pDelays[3];
155
156 /* ynR+=A1 (Q15) * x(n-1)R (Q0) in Q15*/
157 ynR+=(LVM_INT32)pBiquadState->coefs[1]*pBiquadState->pDelays[1];
158
159 /* ynR+=A0 (Q15) * x(n)R (Q0) in Q15*/
160 ynR+=(LVM_INT32)pBiquadState->coefs[2]*(*(pDataIn+1));
161
162 /* ynR+= ( (-B2 (Q15) * y(n-2)R (Q16) )>>16) in Q15 */
163 MUL32x16INTO32(pBiquadState->pDelays[7],pBiquadState->coefs[3],templ,16)
164 ynR+=templ;
165
166 /* ynR+=( (-B1 (Q15) * y(n-1)R (Q16) )>>16) in Q15 */
167 MUL32x16INTO32(pBiquadState->pDelays[5],pBiquadState->coefs[4],templ,16)
168 ynR+=templ;
169
170 /**************************************************************************
171 UPDATING THE DELAYS
172 ***************************************************************************/
173 pBiquadState->pDelays[7]=pBiquadState->pDelays[5]; /* y(n-2)R=y(n-1)R*/
174 pBiquadState->pDelays[6]=pBiquadState->pDelays[4]; /* y(n-2)L=y(n-1)L*/
175 pBiquadState->pDelays[3]=pBiquadState->pDelays[1]; /* x(n-2)R=x(n-1)R*/
176 pBiquadState->pDelays[2]=pBiquadState->pDelays[0]; /* x(n-2)L=x(n-1)L*/
177 pBiquadState->pDelays[5]=ynR<<1; /* Update y(n-1)R in Q16*/
178 pBiquadState->pDelays[4]=ynL<<1; /* Update y(n-1)L in Q16*/
179 pBiquadState->pDelays[0]=(*pDataIn); /* Update x(n-1)L in Q0*/
180 pDataIn++;
181 pBiquadState->pDelays[1]=(*pDataIn); /* Update x(n-1)R in Q0*/
182 pDataIn++;
183
184 /**************************************************************************
185 WRITING THE OUTPUT
186 ***************************************************************************/
187 *pDataOut=(LVM_INT16)(ynL>>15); /* Write Left output in Q0*/
188 pDataOut++;
189 *pDataOut=(LVM_INT16)(ynR>>15); /* Write Right ouput in Q0*/
190 pDataOut++;
191 }
192
193 }
194 #endif
195