diff options
Diffstat (limited to 'codecs/ilbc/iCBConstruct.c')
-rwxr-xr-x | codecs/ilbc/iCBConstruct.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/codecs/ilbc/iCBConstruct.c b/codecs/ilbc/iCBConstruct.c new file mode 100755 index 000000000..ccb3f663b --- /dev/null +++ b/codecs/ilbc/iCBConstruct.c @@ -0,0 +1,104 @@ + +/****************************************************************** + + iLBC Speech Coder ANSI-C Source Code + + iCBConstruct.c + + Copyright (c) 2001, + Global IP Sound AB. + 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]; + } + } + } +} + + |