diff options
Diffstat (limited to 'third_party/ilbc/iCBConstruct.c')
-rw-r--r-- | third_party/ilbc/iCBConstruct.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/third_party/ilbc/iCBConstruct.c b/third_party/ilbc/iCBConstruct.c new file mode 100644 index 00000000..ee9a73ca --- /dev/null +++ b/third_party/ilbc/iCBConstruct.c @@ -0,0 +1,112 @@ + + /****************************************************************** + + iLBC Speech Coder ANSI-C Source Code + + iCBConstruct.c + + Copyright (C) The Internet Society (2004). + All Rights Reserved. + + ******************************************************************/ + + #include <math.h> + + #include "iLBC_define.h" + #include "gainquant.h" + #include "getCBvec.h" + + /*----------------------------------------------------------------* + * Convert the codebook indexes to make the search easier + *---------------------------------------------------------------*/ + + + + + + + void index_conv_enc( + int *index /* (i/o) Codebook indexes */ + ){ + int k; + + for (k=1; k<CB_NSTAGES; k++) { + + if ((index[k]>=108)&&(index[k]<172)) { + index[k]-=64; + } else if (index[k]>=236) { + index[k]-=128; + } else { + /* ERROR */ + } + } + } + + void index_conv_dec( + int *index /* (i/o) Codebook indexes */ + ){ + int k; + + for (k=1; k<CB_NSTAGES; k++) { + + if ((index[k]>=44)&&(index[k]<108)) { + index[k]+=64; + } else if ((index[k]>=108)&&(index[k]<128)) { + index[k]+=128; + } else { + /* ERROR */ + } + } + } + + /*----------------------------------------------------------------* + * Construct decoded vector from codebook and gains. + *---------------------------------------------------------------*/ + + void iCBConstruct( + float *decvector, /* (o) Decoded vector */ + int *index, /* (i) Codebook indices */ + int *gain_index,/* (i) Gain quantization indices */ + float *mem, /* (i) Buffer for codevector construction */ + int lMem, /* (i) Length of buffer */ + int veclen, /* (i) Length of vector */ + int nStages /* (i) Number of codebook stages */ + ){ + int j,k; + + + + + + float gain[CB_NSTAGES]; + float cbvec[SUBL]; + + /* gain de-quantization */ + + gain[0] = gaindequant(gain_index[0], 1.0, 32); + if (nStages > 1) { + gain[1] = gaindequant(gain_index[1], + (float)fabs(gain[0]), 16); + } + if (nStages > 2) { + gain[2] = gaindequant(gain_index[2], + (float)fabs(gain[1]), 8); + } + + /* codebook vector construction and construction of + total vector */ + + getCBvec(cbvec, mem, index[0], lMem, veclen); + for (j=0;j<veclen;j++){ + decvector[j] = gain[0]*cbvec[j]; + } + if (nStages > 1) { + for (k=1; k<nStages; k++) { + getCBvec(cbvec, mem, index[k], lMem, veclen); + for (j=0;j<veclen;j++) { + decvector[j] += gain[k]*cbvec[j]; + } + } + } + } + |