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 /**************************************************************************
24 ASSUMPTIONS:
25 COEFS-
26 pBiquadState->coefs[0] is A2, pBiquadState->coefs[1] is A1
27 pBiquadState->coefs[2] is A0, pBiquadState->coefs[3] is -B2
28 pBiquadState->coefs[4] is -B1, these are in Q13 format
29
30 DELAYS-
31 pBiquadState->pDelays[0] is x(n-1)L in Q0 format
32 pBiquadState->pDelays[1] is x(n-1)R in Q0 format
33 pBiquadState->pDelays[2] is x(n-2)L in Q0 format
34 pBiquadState->pDelays[3] is x(n-2)R in Q0 format
35 pBiquadState->pDelays[4] is y(n-1)L in Q16 format
36 pBiquadState->pDelays[5] is y(n-1)R in Q16 format
37 pBiquadState->pDelays[6] is y(n-2)L in Q16 format
38 pBiquadState->pDelays[7] is y(n-2)R in Q16 format
39 ***************************************************************************/
40 #ifdef BUILD_FLOAT
BQ_2I_D16F32C13_TRC_WRA_01(Biquad_FLOAT_Instance_t * pInstance,LVM_FLOAT * pDataIn,LVM_FLOAT * pDataOut,LVM_INT16 NrSamples)41 void BQ_2I_D16F32C13_TRC_WRA_01 ( Biquad_FLOAT_Instance_t *pInstance,
42 LVM_FLOAT *pDataIn,
43 LVM_FLOAT *pDataOut,
44 LVM_INT16 NrSamples)
45 {
46 LVM_FLOAT ynL,ynR;
47 LVM_INT16 ii;
48 PFilter_State_FLOAT pBiquadState = (PFilter_State_FLOAT) pInstance;
49
50 for (ii = NrSamples; ii != 0; ii--)
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 /* ynL+=-B1*y(n-1)L */
69 ynL += pBiquadState->pDelays[4] * pBiquadState->coefs[4];
70
71 /**************************************************************************
72 PROCESSING OF THE RIGHT CHANNEL
73 ***************************************************************************/
74 /* ynR=A2 * x(n-2)R */
75 ynR = (LVM_FLOAT)pBiquadState->coefs[0] * pBiquadState->pDelays[3];
76
77 /* ynR+=A1* x(n-1)R */
78 ynR += (LVM_FLOAT)pBiquadState->coefs[1] * pBiquadState->pDelays[1];
79
80 /* ynR+=A0* x(n)R */
81 ynR += (LVM_FLOAT)pBiquadState->coefs[2] * (*(pDataIn+1));
82
83 /* ynR+=-B2 * y(n-2)R */
84 ynR += pBiquadState->pDelays[7] * pBiquadState->coefs[3];
85
86 /* ynR+=-B1 * y(n-1)R */
87 ynR += pBiquadState->pDelays[5] * pBiquadState->coefs[4];
88
89 /**************************************************************************
90 UPDATING THE DELAYS
91 ***************************************************************************/
92 pBiquadState->pDelays[7] = pBiquadState->pDelays[5]; /* y(n-2)R=y(n-1)R*/
93 pBiquadState->pDelays[6] = pBiquadState->pDelays[4]; /* y(n-2)L=y(n-1)L*/
94 pBiquadState->pDelays[3] = pBiquadState->pDelays[1]; /* x(n-2)R=x(n-1)R*/
95 pBiquadState->pDelays[2] = pBiquadState->pDelays[0]; /* x(n-2)L=x(n-1)L*/
96 pBiquadState->pDelays[5] = ynR; /* Update y(n-1)R */
97 pBiquadState->pDelays[4] = ynL; /* Update y(n-1)L */
98 pBiquadState->pDelays[0] = (*pDataIn); /* Update x(n-1)L */
99 pDataIn++;
100 pBiquadState->pDelays[1] = (*pDataIn); /* Update x(n-1)R */
101 pDataIn++;
102
103 /**************************************************************************
104 WRITING THE OUTPUT
105 ***************************************************************************/
106 *pDataOut = (LVM_FLOAT)(ynL); /* Write Left output */
107 pDataOut++;
108 *pDataOut = (LVM_FLOAT)(ynR); /* Write Right ouput */
109 pDataOut++;
110 }
111 }
112 #else
BQ_2I_D16F32C13_TRC_WRA_01(Biquad_Instance_t * pInstance,LVM_INT16 * pDataIn,LVM_INT16 * pDataOut,LVM_INT16 NrSamples)113 void BQ_2I_D16F32C13_TRC_WRA_01 ( Biquad_Instance_t *pInstance,
114 LVM_INT16 *pDataIn,
115 LVM_INT16 *pDataOut,
116 LVM_INT16 NrSamples)
117 {
118 LVM_INT32 ynL,ynR,templ;
119 LVM_INT16 ii;
120 PFilter_State pBiquadState = (PFilter_State) pInstance;
121
122 for (ii = NrSamples; ii != 0; ii--)
123 {
124
125
126 /**************************************************************************
127 PROCESSING OF THE LEFT CHANNEL
128 ***************************************************************************/
129 /* ynL=A2 (Q13) * x(n-2)L (Q0) in Q13*/
130 ynL=(LVM_INT32)pBiquadState->coefs[0]* pBiquadState->pDelays[2];
131
132 /* ynL+=A1 (Q13) * x(n-1)L (Q0) in Q13*/
133 ynL+=(LVM_INT32)pBiquadState->coefs[1]* pBiquadState->pDelays[0];
134
135 /* ynL+=A0 (Q13) * x(n)L (Q0) in Q13*/
136 ynL+=(LVM_INT32)pBiquadState->coefs[2]* (*pDataIn);
137
138 /* ynL+= ( (-B2 (Q13) * y(n-2)L (Q16) )>>16) in Q13 */
139 MUL32x16INTO32(pBiquadState->pDelays[6],pBiquadState->coefs[3],templ,16)
140 ynL+=templ;
141
142 /* ynL+=( (-B1 (Q13) * y(n-1)L (Q16) )>>16) in Q13 */
143 MUL32x16INTO32(pBiquadState->pDelays[4],pBiquadState->coefs[4],templ,16)
144 ynL+=templ;
145
146 /**************************************************************************
147 PROCESSING OF THE RIGHT CHANNEL
148 ***************************************************************************/
149 /* ynR=A2 (Q13) * x(n-2)R (Q0) in Q13*/
150 ynR=(LVM_INT32)pBiquadState->coefs[0]*pBiquadState->pDelays[3];
151
152 /* ynR+=A1 (Q13) * x(n-1)R (Q0) in Q13*/
153 ynR+=(LVM_INT32)pBiquadState->coefs[1]*pBiquadState->pDelays[1];
154
155 /* ynR+=A0 (Q13) * x(n)R (Q0) in Q13*/
156 ynR+=(LVM_INT32)pBiquadState->coefs[2]*(*(pDataIn+1));
157
158 /* ynR+= ( (-B2 (Q13) * y(n-2)R (Q16) )>>16) in Q13*/
159 MUL32x16INTO32(pBiquadState->pDelays[7],pBiquadState->coefs[3],templ,16)
160 ynR+=templ;
161
162 /* ynR+=( (-B1 (Q13) * y(n-1)R (Q16) )>>16) in Q13 */
163 MUL32x16INTO32(pBiquadState->pDelays[5],pBiquadState->coefs[4],templ,16)
164 ynR+=templ;
165
166 /**************************************************************************
167 UPDATING THE DELAYS
168 ***************************************************************************/
169 pBiquadState->pDelays[7]=pBiquadState->pDelays[5]; /* y(n-2)R=y(n-1)R*/
170 pBiquadState->pDelays[6]=pBiquadState->pDelays[4]; /* y(n-2)L=y(n-1)L*/
171 pBiquadState->pDelays[3]=pBiquadState->pDelays[1]; /* x(n-2)R=x(n-1)R*/
172 pBiquadState->pDelays[2]=pBiquadState->pDelays[0]; /* x(n-2)L=x(n-1)L*/
173 pBiquadState->pDelays[5]=ynR<<3; /* Update y(n-1)R in Q16*/
174 pBiquadState->pDelays[4]=ynL<<3; /* Update y(n-1)L in Q16*/
175 pBiquadState->pDelays[0]=(*pDataIn); /* Update x(n-1)L in Q0*/
176 pDataIn++;
177 pBiquadState->pDelays[1]=(*pDataIn); /* Update x(n-1)R in Q0*/
178 pDataIn++;
179
180 /**************************************************************************
181 WRITING THE OUTPUT
182 ***************************************************************************/
183 *pDataOut=(LVM_INT16)(ynL>>13); /* Write Left output in Q0*/
184 pDataOut++;
185 *pDataOut=(LVM_INT16)(ynR>>13); /* Write Right ouput in Q0*/
186 pDataOut++;
187 }
188
189 }
190 #endif
191