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Functions | |
| void | getCBvec (float *cbvec, float *mem, int index, int lMem, int cbveclen) |
Function Documentation
◆ getCBvec()
| void getCBvec | ( | float * | cbvec, |
| float * | mem, | ||
| int | index, | ||
| int | lMem, | ||
| int | cbveclen | ||
| ) |
Definition at line 21 of file getCBvec.c.
32 {
33 int j, k, n, memInd, sFilt;
35 int base_size;
36 int ilow, ihigh;
37 float alfa, alfa1;
38
39 /* Determine size of codebook sections */
40
41 base_size=lMem-cbveclen+1;
42
44 base_size+=cbveclen/2;
45 }
46
47 /* No filter -> First codebook section */
48
49 if (index<lMem-cbveclen+1) {
50
51 /* first non-interpolated vectors */
52
53 k=index+cbveclen;
54 /* get vector */
55 memcpy(cbvec, mem+lMem-k, cbveclen*sizeof(float));
56
57 } else if (index < base_size) {
58
59 k=2*(index-(lMem-cbveclen+1))+cbveclen;
60
61 ihigh=k/2;
62 ilow=ihigh-5;
63
64 /* Copy first noninterpolated part */
65
66 memcpy(cbvec, mem+lMem-k/2, ilow*sizeof(float));
67
68 /* interpolation */
69
70 alfa1=(float)0.2;
71 alfa=0.0;
72 for (j=ilow; j<ihigh; j++) {
73 cbvec[j]=((float)1.0-alfa)*mem[lMem-k/2+j]+
74 alfa*mem[lMem-k+j];
75
76
77
78
79
80 alfa+=alfa1;
81 }
82
83 /* Copy second noninterpolated part */
84
85 memcpy(cbvec+ihigh, mem+lMem-k+ihigh,
86 (cbveclen-ihigh)*sizeof(float));
87
88 }
89
90 /* Higher codebook section based on filtering */
91
92 else {
93
94 /* first non-interpolated vectors */
95
96 if (index-base_size<lMem-cbveclen+1) {
98 float *pos;
99 float *pp, *pp1;
100
101 memset(tempbuff2, 0,
103 memcpy(&tempbuff2[CB_HALFFILTERLEN], mem,
104 lMem*sizeof(float));
105 memset(&tempbuff2[lMem+CB_HALFFILTERLEN], 0,
107
108 k=index-base_size+cbveclen;
109 sFilt=lMem-k;
110 memInd=sFilt+1-CB_HALFFILTERLEN;
111
112 /* do filtering */
113 pos=cbvec;
114 memset(pos, 0, cbveclen*sizeof(float));
115 for (n=0; n<cbveclen; n++) {
116 pp=&tempbuff2[memInd+n+CB_HALFFILTERLEN];
119 (*pos)+=(*pp++)*(*pp1--);
120 }
121 pos++;
122 }
123 }
124
125 /* interpolated vectors */
126
127 else {
128
129
130
131
132
134
135 float *pos;
136 float *pp, *pp1;
137 int i;
138
139 memset(tempbuff2, 0,
141 memcpy(&tempbuff2[CB_HALFFILTERLEN], mem,
142 lMem*sizeof(float));
143 memset(&tempbuff2[lMem+CB_HALFFILTERLEN], 0,
145
146 k=2*(index-base_size-
147 (lMem-cbveclen+1))+cbveclen;
148 sFilt=lMem-k;
149 memInd=sFilt+1-CB_HALFFILTERLEN;
150
151 /* do filtering */
152 pos=&tmpbuf[sFilt];
153 memset(pos, 0, k*sizeof(float));
154 for (i=0; i<k; i++) {
155 pp=&tempbuff2[memInd+i+CB_HALFFILTERLEN];
158 (*pos)+=(*pp++)*(*pp1--);
159 }
160 pos++;
161 }
162
163 ihigh=k/2;
164 ilow=ihigh-5;
165
166 /* Copy first noninterpolated part */
167
168 memcpy(cbvec, tmpbuf+lMem-k/2,
169 ilow*sizeof(float));
170
171 /* interpolation */
172
173 alfa1=(float)0.2;
174 alfa=0.0;
175 for (j=ilow; j<ihigh; j++) {
176 cbvec[j]=((float)1.0-alfa)*
177 tmpbuf[lMem-k/2+j]+alfa*tmpbuf[lMem-k+j];
178 alfa+=alfa1;
179 }
180
181
182
183
184
185
186 /* Copy second noninterpolated part */
187
188 memcpy(cbvec+ihigh, tmpbuf+lMem-k+ihigh,
189 (cbveclen-ihigh)*sizeof(float));
190 }
191 }
192 }
References CB_FILTERLEN, CB_HALFFILTERLEN, CB_MEML, cbfiltersTbl, and SUBL.
Referenced by iCBConstruct().
