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 Q14 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_D16F32C14_TRC_WRA_01(Biquad_FLOAT_Instance_t * pInstance,LVM_FLOAT * pDataIn,LVM_FLOAT * pDataOut,LVM_INT16 NrSamples)40 void BQ_2I_D16F32C14_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 PROCESSING OF THE RIGHT CHANNEL
74 ***************************************************************************/
75 /* ynR=A2 * x(n-2)R */
76 ynR = (LVM_FLOAT)pBiquadState->coefs[0] * pBiquadState->pDelays[3];
77
78 /* ynR+=A1 * x(n-1)R */
79 ynR += (LVM_FLOAT)pBiquadState->coefs[1] * pBiquadState->pDelays[1];
80
81 /* ynR+=A0 * x(n)R */
82 ynR += (LVM_FLOAT)pBiquadState->coefs[2] * (*(pDataIn+1));
83
84 /* ynR+= ( (-B2 * y(n-2)R ))*/
85 ynR += pBiquadState->pDelays[7] * pBiquadState->coefs[3];
86
87 /* ynR+=( (-B1 * y(n-1)R )) */
88 ynR += pBiquadState->pDelays[5] * pBiquadState->coefs[4];
89
90 /**************************************************************************
91 UPDATING THE DELAYS
92 ***************************************************************************/
93 pBiquadState->pDelays[7] = pBiquadState->pDelays[5]; /* y(n-2)R=y(n-1)R*/
94 pBiquadState->pDelays[6] = pBiquadState->pDelays[4]; /* y(n-2)L=y(n-1)L*/
95 pBiquadState->pDelays[3] = pBiquadState->pDelays[1]; /* x(n-2)R=x(n-1)R*/
96 pBiquadState->pDelays[2] = pBiquadState->pDelays[0]; /* x(n-2)L=x(n-1)L*/
97 pBiquadState->pDelays[5] = ynR; /* Update y(n-1)R */
98 pBiquadState->pDelays[4] = ynL; /* Update y(n-1)L */
99 pBiquadState->pDelays[0] = (*pDataIn); /* Update x(n-1)L */
100 pDataIn++;
101 pBiquadState->pDelays[1] = (*pDataIn); /* Update x(n-1)R */
102 pDataIn++;
103
104 /**************************************************************************
105 WRITING THE OUTPUT
106 ***************************************************************************/
107 *pDataOut = (LVM_FLOAT)(ynL); /* Write Left output */
108 pDataOut++;
109 *pDataOut = (LVM_FLOAT)(ynR); /* Write Right ouput */
110 pDataOut++;
111 }
112
113 }
114 #else
BQ_2I_D16F32C14_TRC_WRA_01(Biquad_Instance_t * pInstance,LVM_INT16 * pDataIn,LVM_INT16 * pDataOut,LVM_INT16 NrSamples)115 void BQ_2I_D16F32C14_TRC_WRA_01 ( Biquad_Instance_t *pInstance,
116 LVM_INT16 *pDataIn,
117 LVM_INT16 *pDataOut,
118 LVM_INT16 NrSamples)
119 {
120 LVM_INT32 ynL,ynR,templ;
121 LVM_INT16 ii;
122 PFilter_State pBiquadState = (PFilter_State) pInstance;
123
124 for (ii = NrSamples; ii != 0; ii--)
125 {
126
127
128 /**************************************************************************
129 PROCESSING OF THE LEFT CHANNEL
130 ***************************************************************************/
131 /* ynL=A2 (Q14) * x(n-2)L (Q0) in Q14*/
132 ynL=(LVM_INT32)pBiquadState->coefs[0]* pBiquadState->pDelays[2];
133
134 /* ynL+=A1 (Q14) * x(n-1)L (Q0) in Q14*/
135 ynL+=(LVM_INT32)pBiquadState->coefs[1]* pBiquadState->pDelays[0];
136
137 /* ynL+=A0 (Q14) * x(n)L (Q0) in Q14*/
138 ynL+=(LVM_INT32)pBiquadState->coefs[2]* (*pDataIn);
139
140 /* ynL+= ( (-B2 (Q14) * y(n-2)L (Q16) )>>16) in Q14 */
141 MUL32x16INTO32(pBiquadState->pDelays[6],pBiquadState->coefs[3],templ,16)
142 ynL+=templ;
143
144 /* ynL+=( (-B1 (Q14) * y(n-1)L (Q16) )>>16) in Q14 */
145 MUL32x16INTO32(pBiquadState->pDelays[4],pBiquadState->coefs[4],templ,16)
146 ynL+=templ;
147
148 /**************************************************************************
149 PROCESSING OF THE RIGHT CHANNEL
150 ***************************************************************************/
151 /* ynR=A2 (Q14) * x(n-2)R (Q0) in Q14*/
152 ynR=(LVM_INT32)pBiquadState->coefs[0]*pBiquadState->pDelays[3];
153
154 /* ynR+=A1 (Q14) * x(n-1)R (Q0) in Q14*/
155 ynR+=(LVM_INT32)pBiquadState->coefs[1]*pBiquadState->pDelays[1];
156
157 /* ynR+=A0 (Q14) * x(n)R (Q0) in Q14*/
158 ynR+=(LVM_INT32)pBiquadState->coefs[2]*(*(pDataIn+1));
159
160 /* ynR+= ( (-B2 (Q14) * y(n-2)R (Q16) )>>16) in Q14*/
161 MUL32x16INTO32(pBiquadState->pDelays[7],pBiquadState->coefs[3],templ,16)
162 ynR+=templ;
163
164 /* ynR+=( (-B1 (Q14) * y(n-1)R (Q16) )>>16) in Q14 */
165 MUL32x16INTO32(pBiquadState->pDelays[5],pBiquadState->coefs[4],templ,16)
166 ynR+=templ;
167
168 /**************************************************************************
169 UPDATING THE DELAYS
170 ***************************************************************************/
171 pBiquadState->pDelays[7]=pBiquadState->pDelays[5]; /* y(n-2)R=y(n-1)R*/
172 pBiquadState->pDelays[6]=pBiquadState->pDelays[4]; /* y(n-2)L=y(n-1)L*/
173 pBiquadState->pDelays[3]=pBiquadState->pDelays[1]; /* x(n-2)R=x(n-1)R*/
174 pBiquadState->pDelays[2]=pBiquadState->pDelays[0]; /* x(n-2)L=x(n-1)L*/
175 pBiquadState->pDelays[5]=ynR<<2; /* Update y(n-1)R in Q16*/
176 pBiquadState->pDelays[4]=ynL<<2; /* Update y(n-1)L in Q16*/
177 pBiquadState->pDelays[0]=(*pDataIn); /* Update x(n-1)L in Q0*/
178 pDataIn++;
179 pBiquadState->pDelays[1]=(*pDataIn); /* Update x(n-1)R in Q0*/
180 pDataIn++;
181
182 /**************************************************************************
183 WRITING THE OUTPUT
184 ***************************************************************************/
185 *pDataOut=(LVM_INT16)(ynL>>14); /* Write Left output in Q0*/
186 pDataOut++;
187 *pDataOut=(LVM_INT16)(ynR>>14); /* Write Right ouput in Q0*/
188 pDataOut++;
189 }
190
191 }
192 #endif
193