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

void AbsQuantW (iLBC_Enc_Inst_t *iLBCenc_inst, float *in, float *syntDenum, float *weightDenum, int *out, int len, int state_first)
 
void StateSearchW (iLBC_Enc_Inst_t *iLBCenc_inst, float *residual, float *syntDenum, float *weightDenum, int *idxForMax, int *idxVec, int len, int state_first)
 

Function Documentation

◆ AbsQuantW()

void AbsQuantW ( iLBC_Enc_Inst_t iLBCenc_inst,
float *  in,
float *  syntDenum,
float *  weightDenum,
int *  out,
int  len,
int  state_first 
)

Definition at line 26 of file StateSearchW.c.

References AllPoleFilter(), len(), LPC_FILTERORDER, sort_sq(), iLBC_Enc_Inst_t_::state_short_len, STATE_SHORT_LEN_30MS, state_sq3Tbl, and SUBL.

Referenced by StateSearchW().

37  {
38  float *syntOut;
39  float syntOutBuf[LPC_FILTERORDER+STATE_SHORT_LEN_30MS];
40  float toQ, xq;
41  int n;
42  int index;
43 
44  /* initialization of buffer for filtering */
45 
46  memset(syntOutBuf, 0, LPC_FILTERORDER*sizeof(float));
47 
48 
49 
50 
51 
52 
53  /* initialization of pointer for filtering */
54 
55  syntOut = &syntOutBuf[LPC_FILTERORDER];
56 
57  /* synthesis and weighting filters on input */
58 
59  if (state_first) {
60  AllPoleFilter (in, weightDenum, SUBL, LPC_FILTERORDER);
61  } else {
62  AllPoleFilter (in, weightDenum,
63  iLBCenc_inst->state_short_len-SUBL,
65  }
66 
67  /* encoding loop */
68 
69  for (n=0; n<len; n++) {
70 
71  /* time update of filter coefficients */
72 
73  if ((state_first)&&(n==SUBL)){
74  syntDenum += (LPC_FILTERORDER+1);
75  weightDenum += (LPC_FILTERORDER+1);
76 
77  /* synthesis and weighting filters on input */
78  AllPoleFilter (&in[n], weightDenum, len-n,
80 
81  } else if ((state_first==0)&&
82  (n==(iLBCenc_inst->state_short_len-SUBL))) {
83  syntDenum += (LPC_FILTERORDER+1);
84  weightDenum += (LPC_FILTERORDER+1);
85 
86  /* synthesis and weighting filters on input */
87  AllPoleFilter (&in[n], weightDenum, len-n,
89 
90  }
91 
92  /* prediction of synthesized and weighted input */
93 
94  syntOut[n] = 0.0;
95  AllPoleFilter (&syntOut[n], weightDenum, 1,
97 
98  /* quantization */
99 
100  toQ = in[n]-syntOut[n];
101 
102 
103 
104 
105 
106  sort_sq(&xq, &index, toQ, state_sq3Tbl, 8);
107  out[n]=index;
108  syntOut[n] = state_sq3Tbl[out[n]];
109 
110  /* update of the prediction filter */
111 
112  AllPoleFilter(&syntOut[n], weightDenum, 1,
114  }
115  }
#define STATE_SHORT_LEN_30MS
Definition: iLBC_define.h:35
void AllPoleFilter(float *InOut, float *Coef, int lengthInOut, int orderCoef)
Definition: filter.c:19
float state_sq3Tbl[8]
Definition: constants.c:97
FILE * in
Definition: utils/frame.c:33
#define SUBL
Definition: iLBC_define.h:33
#define LPC_FILTERORDER
Definition: iLBC_define.h:40
static int len(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t buflen)
void sort_sq(float *xq, int *index, float x, const float *cb, int cb_size)
Definition: helpfun.c:235
FILE * out
Definition: utils/frame.c:33

◆ StateSearchW()

void StateSearchW ( iLBC_Enc_Inst_t iLBCenc_inst,
float *  residual,
float *  syntDenum,
float *  weightDenum,
int *  idxForMax,
int *  idxVec,
int  len,
int  state_first 
)

Definition at line 121 of file StateSearchW.c.

References AbsQuantW(), len(), LPC_FILTERORDER, sort_sq(), state_frgqTbl, STATE_SHORT_LEN_30MS, tmp(), and ZeroPoleFilter().

Referenced by iLBC_encode().

133  {
134  float dtmp, maxVal;
135  float tmpbuf[LPC_FILTERORDER+2*STATE_SHORT_LEN_30MS];
136  float *tmp, numerator[1+LPC_FILTERORDER];
137  float foutbuf[LPC_FILTERORDER+2*STATE_SHORT_LEN_30MS], *fout;
138  int k;
139  float qmax, scal;
140 
141  /* initialization of buffers and filter coefficients */
142 
143  memset(tmpbuf, 0, LPC_FILTERORDER*sizeof(float));
144  memset(foutbuf, 0, LPC_FILTERORDER*sizeof(float));
145  for (k=0; k<LPC_FILTERORDER; k++) {
146  numerator[k]=syntDenum[LPC_FILTERORDER-k];
147  }
148  numerator[LPC_FILTERORDER]=syntDenum[0];
149  tmp = &tmpbuf[LPC_FILTERORDER];
150  fout = &foutbuf[LPC_FILTERORDER];
151 
152  /* circular convolution with the all-pass filter */
153 
154 
155 
156 
157 
158 
159  memcpy(tmp, residual, len*sizeof(float));
160  memset(tmp+len, 0, len*sizeof(float));
161  ZeroPoleFilter(tmp, numerator, syntDenum, 2*len,
162  LPC_FILTERORDER, fout);
163  for (k=0; k<len; k++) {
164  fout[k] += fout[k+len];
165  }
166 
167  /* identification of the maximum amplitude value */
168 
169  maxVal = fout[0];
170  for (k=1; k<len; k++) {
171 
172  if (fout[k]*fout[k] > maxVal*maxVal){
173  maxVal = fout[k];
174  }
175  }
176  maxVal=(float)fabs(maxVal);
177 
178  /* encoding of the maximum amplitude value */
179 
180  if (maxVal < 10.0) {
181  maxVal = 10.0;
182  }
183  maxVal = (float)log10(maxVal);
184  sort_sq(&dtmp, idxForMax, maxVal, state_frgqTbl, 64);
185 
186  /* decoding of the maximum amplitude representation value,
187  and corresponding scaling of start state */
188 
189  maxVal=state_frgqTbl[*idxForMax];
190  qmax = (float)pow(10,maxVal);
191  scal = (float)(4.5)/qmax;
192  for (k=0; k<len; k++){
193  fout[k] *= scal;
194  }
195 
196  /* predictive noise shaping encoding of scaled start state */
197 
198  AbsQuantW(iLBCenc_inst, fout,syntDenum,
199  weightDenum,idxVec, len, state_first);
200  }
#define STATE_SHORT_LEN_30MS
Definition: iLBC_define.h:35
static int tmp()
Definition: bt_open.c:389
float state_frgqTbl[64]
Definition: constants.c:108
#define LPC_FILTERORDER
Definition: iLBC_define.h:40
static int len(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t buflen)
void sort_sq(float *xq, int *index, float x, const float *cb, int cb_size)
Definition: helpfun.c:235
void ZeroPoleFilter(float *In, float *ZeroCoef, float *PoleCoef, int lengthInOut, int orderCoef, float *Out)
Definition: filter.c:80
void AbsQuantW(iLBC_Enc_Inst_t *iLBCenc_inst, float *in, float *syntDenum, float *weightDenum, int *out, int len, int state_first)
Definition: StateSearchW.c:26