Asterisk - The Open Source Telephony Project  18.5.0
Functions
iCBConstruct.h File Reference
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Functions

void iCBConstruct (float *decvector, int *index, int *gain_index, float *mem, int lMem, int veclen, int nStages)
 
void index_conv_dec (int *index)
 
void index_conv_enc (int *index)
 

Function Documentation

◆ iCBConstruct()

void iCBConstruct ( float *  decvector,
int *  index,
int *  gain_index,
float *  mem,
int  lMem,
int  veclen,
int  nStages 
)

Definition at line 66 of file iCBConstruct.c.

References CB_NSTAGES, gaindequant(), getCBvec(), and SUBL.

Referenced by Decode(), and iLBC_encode().

74  {
75  int j,k;
76 
77 
78 
79 
80 
81  float gain[CB_NSTAGES];
82  float cbvec[SUBL];
83 
84  /* gain de-quantization */
85 
86  gain[0] = gaindequant(gain_index[0], 1.0, 32);
87  if (nStages > 1) {
88  gain[1] = gaindequant(gain_index[1],
89  (float)fabs(gain[0]), 16);
90  }
91  if (nStages > 2) {
92  gain[2] = gaindequant(gain_index[2],
93  (float)fabs(gain[1]), 8);
94  }
95 
96  /* codebook vector construction and construction of
97  total vector */
98 
99  getCBvec(cbvec, mem, index[0], lMem, veclen);
100  for (j=0;j<veclen;j++){
101  decvector[j] = gain[0]*cbvec[j];
102  }
103  if (nStages > 1) {
104  for (k=1; k<nStages; k++) {
105  getCBvec(cbvec, mem, index[k], lMem, veclen);
106  for (j=0;j<veclen;j++) {
107  decvector[j] += gain[k]*cbvec[j];
108  }
109  }
110  }
111  }
#define CB_NSTAGES
Definition: iLBC_define.h:56
void getCBvec(float *cbvec, float *mem, int index, int lMem, int cbveclen)
Definition: getCBvec.c:21
#define SUBL
Definition: iLBC_define.h:33
float gaindequant(int index, float maxIn, int cblen)
Definition: gainquant.c:83

◆ index_conv_dec()

void index_conv_dec ( int *  index)

Definition at line 45 of file iCBConstruct.c.

References CB_NSTAGES.

Referenced by iLBC_decode().

47  {
48  int k;
49 
50  for (k=1; k<CB_NSTAGES; k++) {
51 
52  if ((index[k]>=44)&&(index[k]<108)) {
53  index[k]+=64;
54  } else if ((index[k]>=108)&&(index[k]<128)) {
55  index[k]+=128;
56  } else {
57  /* ERROR */
58  }
59  }
60  }
#define CB_NSTAGES
Definition: iLBC_define.h:56

◆ index_conv_enc()

void index_conv_enc ( int *  index)

Definition at line 28 of file iCBConstruct.c.

References CB_NSTAGES.

Referenced by iLBC_encode().

30  {
31  int k;
32 
33  for (k=1; k<CB_NSTAGES; k++) {
34 
35  if ((index[k]>=108)&&(index[k]<172)) {
36  index[k]-=64;
37  } else if (index[k]>=236) {
38  index[k]-=128;
39  } else {
40  /* ERROR */
41  }
42  }
43  }
#define CB_NSTAGES
Definition: iLBC_define.h:56