diff options
author | Benny Prijono <bennylp@teluu.com> | 2007-04-07 12:47:34 +0000 |
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committer | Benny Prijono <bennylp@teluu.com> | 2007-04-07 12:47:34 +0000 |
commit | 81d1b2797aa3945c529d57f9ddf6179ec2b392a4 (patch) | |
tree | 2ae3b710e8152fb1140653473fbc338a6638178e /third_party/ilbc/StateConstructW.c | |
parent | 3ade1510e72926d02d7c7d4416257449bc0cd3f3 (diff) |
Moved ilbc to third_party directory
git-svn-id: http://svn.pjsip.org/repos/pjproject/branches/split-3rd-party@1169 74dad513-b988-da41-8d7b-12977e46ad98
Diffstat (limited to 'third_party/ilbc/StateConstructW.c')
-rw-r--r-- | third_party/ilbc/StateConstructW.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/third_party/ilbc/StateConstructW.c b/third_party/ilbc/StateConstructW.c new file mode 100644 index 00000000..1d3e65fa --- /dev/null +++ b/third_party/ilbc/StateConstructW.c @@ -0,0 +1,86 @@ + + /****************************************************************** + + iLBC Speech Coder ANSI-C Source Code + + StateConstructW.c + + Copyright (C) The Internet Society (2004). + All Rights Reserved. + + ******************************************************************/ + + #include <math.h> + #include <string.h> + + #include "iLBC_define.h" + #include "constants.h" + #include "filter.h" + + /*----------------------------------------------------------------* + * decoding of the start state + *---------------------------------------------------------------*/ + + void StateConstructW( + int idxForMax, /* (i) 6-bit index for the quantization of + max amplitude */ + int *idxVec, /* (i) vector of quantization indexes */ + float *syntDenum, /* (i) synthesis filter denumerator */ + + + + + + float *out, /* (o) the decoded state vector */ + int len /* (i) length of a state vector */ + ){ + float maxVal, tmpbuf[LPC_FILTERORDER+2*STATE_LEN], *tmp, + numerator[LPC_FILTERORDER+1]; + float foutbuf[LPC_FILTERORDER+2*STATE_LEN], *fout; + int k,tmpi; + + /* decoding of the maximum value */ + + maxVal = state_frgqTbl[idxForMax]; + maxVal = (float)pow(10,maxVal)/(float)4.5; + + /* initialization of buffers and coefficients */ + + memset(tmpbuf, 0, LPC_FILTERORDER*sizeof(float)); + memset(foutbuf, 0, LPC_FILTERORDER*sizeof(float)); + for (k=0; k<LPC_FILTERORDER; k++) { + numerator[k]=syntDenum[LPC_FILTERORDER-k]; + } + numerator[LPC_FILTERORDER]=syntDenum[0]; + tmp = &tmpbuf[LPC_FILTERORDER]; + fout = &foutbuf[LPC_FILTERORDER]; + + /* decoding of the sample values */ + + for (k=0; k<len; k++) { + tmpi = len-1-k; + /* maxVal = 1/scal */ + tmp[k] = maxVal*state_sq3Tbl[idxVec[tmpi]]; + } + + /* circular convolution with all-pass filter */ + + memset(tmp+len, 0, len*sizeof(float)); + ZeroPoleFilter(tmp, numerator, syntDenum, 2*len, + LPC_FILTERORDER, fout); + for (k=0;k<len;k++) { + out[k] = fout[len-1-k]+fout[2*len-1-k]; + } + } + + + + + + + + + + + + |