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 "PK_2I_D32F32CllGss_TRC_WRA_01_Private.h"
20 #include "LVM_Macros.h"
21
22 /**************************************************************************
23 ASSUMPTIONS:
24 COEFS-
25 pBiquadState->coefs[0] is A0,
26 pBiquadState->coefs[1] is -B2,
27 pBiquadState->coefs[2] is -B1, these are in Q30 format
28 pBiquadState->coefs[3] is Gain, in Q11 format
29
30
31 DELAYS-
32 pBiquadState->pDelays[0] is x(n-1)L in Q0 format
33 pBiquadState->pDelays[1] is x(n-1)R in Q0 format
34 pBiquadState->pDelays[2] is x(n-2)L in Q0 format
35 pBiquadState->pDelays[3] is x(n-2)R in Q0 format
36 pBiquadState->pDelays[4] is y(n-1)L in Q0 format
37 pBiquadState->pDelays[5] is y(n-1)R in Q0 format
38 pBiquadState->pDelays[6] is y(n-2)L in Q0 format
39 pBiquadState->pDelays[7] is y(n-2)R in Q0 format
40 ***************************************************************************/
PK_2I_D32F32C30G11_TRC_WRA_01(Biquad_Instance_t * pInstance,LVM_INT32 * pDataIn,LVM_INT32 * pDataOut,LVM_INT16 NrSamples)41 void PK_2I_D32F32C30G11_TRC_WRA_01 ( Biquad_Instance_t *pInstance,
42 LVM_INT32 *pDataIn,
43 LVM_INT32 *pDataOut,
44 LVM_INT16 NrSamples)
45 {
46 LVM_INT32 ynL,ynR,ynLO,ynRO,templ;
47 LVM_INT16 ii;
48 PFilter_State pBiquadState = (PFilter_State) pInstance;
49
50 for (ii = NrSamples; ii != 0; ii--)
51 {
52
53
54 /**************************************************************************
55 PROCESSING OF THE LEFT CHANNEL
56 ***************************************************************************/
57 /* ynL= (A0 (Q30) * (x(n)L (Q0) - x(n-2)L (Q0) ) >>30) in Q0*/
58 templ=(*pDataIn)-pBiquadState->pDelays[2];
59 MUL32x32INTO32(templ,pBiquadState->coefs[0],ynL,30)
60
61 /* ynL+= ((-B2 (Q30) * y(n-2)L (Q0) ) >>30) in Q0*/
62 MUL32x32INTO32(pBiquadState->pDelays[6],pBiquadState->coefs[1],templ,30)
63 ynL+=templ;
64
65 /* ynL+= ((-B1 (Q30) * y(n-1)L (Q0) ) >>30) in Q0 */
66 MUL32x32INTO32(pBiquadState->pDelays[4],pBiquadState->coefs[2],templ,30)
67 ynL+=templ;
68
69 /* ynLO= ((Gain (Q11) * ynL (Q0))>>11) in Q0*/
70 MUL32x16INTO32(ynL,pBiquadState->coefs[3],ynLO,11)
71 /* ynLO=( ynLO(Q0) + x(n)L (Q0) ) in Q0*/
72 ynLO+= (*pDataIn);
73
74 /**************************************************************************
75 PROCESSING OF THE RIGHT CHANNEL
76 ***************************************************************************/
77 /* ynR= (A0 (Q30) * (x(n)R (Q0) - x(n-2)R (Q0) ) >>30) in Q0*/
78 templ=(*(pDataIn+1))-pBiquadState->pDelays[3];
79 MUL32x32INTO32(templ,pBiquadState->coefs[0],ynR,30)
80
81 /* ynR+= ((-B2 (Q30) * y(n-2)R (Q0) ) >>30) in Q0*/
82 MUL32x32INTO32(pBiquadState->pDelays[7],pBiquadState->coefs[1],templ,30)
83 ynR+=templ;
84
85 /* ynR+= ((-B1 (Q30) * y(n-1)R (Q0) ) >>30) in Q0 */
86 MUL32x32INTO32(pBiquadState->pDelays[5],pBiquadState->coefs[2],templ,30)
87 ynR+=templ;
88
89 /* ynRO= ((Gain (Q11) * ynR (Q0))>>11) in Q0*/
90 MUL32x16INTO32(ynR,pBiquadState->coefs[3],ynRO,11)
91
92 /* ynRO=( ynRO(Q0) + x(n)R (Q0) ) in Q0*/
93 ynRO+= (*(pDataIn+1));
94
95 /**************************************************************************
96 UPDATING THE DELAYS
97 ***************************************************************************/
98 pBiquadState->pDelays[7]=pBiquadState->pDelays[5]; /* y(n-2)R=y(n-1)R*/
99 pBiquadState->pDelays[6]=pBiquadState->pDelays[4]; /* y(n-2)L=y(n-1)L*/
100 pBiquadState->pDelays[3]=pBiquadState->pDelays[1]; /* x(n-2)R=x(n-1)R*/
101 pBiquadState->pDelays[2]=pBiquadState->pDelays[0]; /* x(n-2)L=x(n-1)L*/
102 pBiquadState->pDelays[5]=ynR; /* Update y(n-1)R in Q0*/
103 pBiquadState->pDelays[4]=ynL; /* Update y(n-1)L in Q0*/
104 pBiquadState->pDelays[0]=(*pDataIn); /* Update x(n-1)L in Q0*/
105 pDataIn++;
106 pBiquadState->pDelays[1]=(*pDataIn); /* Update x(n-1)R in Q0*/
107 pDataIn++;
108
109 /**************************************************************************
110 WRITING THE OUTPUT
111 ***************************************************************************/
112 *pDataOut=ynLO; /* Write Left output in Q0*/
113 pDataOut++;
114 *pDataOut=ynRO; /* Write Right ouput in Q0*/
115 pDataOut++;
116 }
117
118 }
119
120