diff options
Diffstat (limited to 'codecs/ilbc/LPCencode.c')
| -rw-r--r-- | codecs/ilbc/LPCencode.c | 228 |
1 files changed, 0 insertions, 228 deletions
diff --git a/codecs/ilbc/LPCencode.c b/codecs/ilbc/LPCencode.c deleted file mode 100644 index 4d5fcff21..000000000 --- a/codecs/ilbc/LPCencode.c +++ /dev/null @@ -1,228 +0,0 @@ - -/****************************************************************** - - iLBC Speech Coder ANSI-C Source Code - - LPCencode.c - - Copyright (C) The Internet Society (2004). - All Rights Reserved. - -******************************************************************/ - -#include <string.h> - - - -#include "iLBC_define.h" -#include "LPCencode.h" -#include "helpfun.h" -#include "lsf.h" -#include "constants.h" - -/*----------------------------------------------------------------* - * lpc analysis (subrutine to LPCencode) - *---------------------------------------------------------------*/ - -static void SimpleAnalysis( - float *lsf, /* (o) lsf coefficients */ - float *data, /* (i) new data vector */ - iLBC_Enc_Inst_t *iLBCenc_inst - /* (i/o) the encoder state structure */ -){ - int k, is; - float temp[BLOCKL_MAX], lp[LPC_FILTERORDER + 1]; - float lp2[LPC_FILTERORDER + 1]; - float r[LPC_FILTERORDER + 1]; - - is=LPC_LOOKBACK+BLOCKL_MAX-iLBCenc_inst->blockl; - memcpy(iLBCenc_inst->lpc_buffer+is,data, - iLBCenc_inst->blockl*sizeof(float)); - - /* No lookahead, last window is asymmetric */ - - for (k = 0; k < iLBCenc_inst->lpc_n; k++) { - - is = LPC_LOOKBACK; - - if (k < (iLBCenc_inst->lpc_n - 1)) { - window(temp, lpc_winTbl, - iLBCenc_inst->lpc_buffer, BLOCKL_MAX); - } else { - window(temp, lpc_asymwinTbl, - iLBCenc_inst->lpc_buffer + is, BLOCKL_MAX); - } - - autocorr(r, temp, BLOCKL_MAX, LPC_FILTERORDER); - window(r, r, lpc_lagwinTbl, LPC_FILTERORDER + 1); - - levdurb(lp, temp, r, LPC_FILTERORDER); - bwexpand(lp2, lp, LPC_CHIRP_SYNTDENUM, LPC_FILTERORDER+1); - - a2lsf(lsf + k*LPC_FILTERORDER, lp2); - } - is=LPC_LOOKBACK+BLOCKL_MAX-iLBCenc_inst->blockl; - memmove(iLBCenc_inst->lpc_buffer, - iLBCenc_inst->lpc_buffer+LPC_LOOKBACK+BLOCKL_MAX-is, - is*sizeof(float)); -} - -/*----------------------------------------------------------------* - - - * lsf interpolator and conversion from lsf to a coefficients - * (subrutine to SimpleInterpolateLSF) - *---------------------------------------------------------------*/ - -static void LSFinterpolate2a_enc( - float *a, /* (o) lpc coefficients */ - float *lsf1,/* (i) first set of lsf coefficients */ - float *lsf2,/* (i) second set of lsf coefficients */ - float coef, /* (i) weighting coefficient to use between - lsf1 and lsf2 */ - long length /* (i) length of coefficient vectors */ -){ - float lsftmp[LPC_FILTERORDER]; - - interpolate(lsftmp, lsf1, lsf2, coef, length); - lsf2a(a, lsftmp); -} - -/*----------------------------------------------------------------* - * lsf interpolator (subrutine to LPCencode) - *---------------------------------------------------------------*/ - -static void SimpleInterpolateLSF( - float *syntdenum, /* (o) the synthesis filter denominator - resulting from the quantized - interpolated lsf */ - float *weightdenum, /* (o) the weighting filter denominator - resulting from the unquantized - interpolated lsf */ - float *lsf, /* (i) the unquantized lsf coefficients */ - float *lsfdeq, /* (i) the dequantized lsf coefficients */ - float *lsfold, /* (i) the unquantized lsf coefficients of - the previous signal frame */ - float *lsfdeqold, /* (i) the dequantized lsf coefficients of - the previous signal frame */ - int length, /* (i) should equate LPC_FILTERORDER */ - iLBC_Enc_Inst_t *iLBCenc_inst - /* (i/o) the encoder state structure */ -){ - int i, pos, lp_length; - float lp[LPC_FILTERORDER + 1], *lsf2, *lsfdeq2; - - lsf2 = lsf + length; - lsfdeq2 = lsfdeq + length; - lp_length = length + 1; - - if (iLBCenc_inst->mode==30) { - /* sub-frame 1: Interpolation between old and first - set of lsf coefficients */ - - LSFinterpolate2a_enc(lp, lsfdeqold, lsfdeq, - lsf_weightTbl_30ms[0], length); - memcpy(syntdenum,lp,lp_length*sizeof(float)); - LSFinterpolate2a_enc(lp, lsfold, lsf, - - - lsf_weightTbl_30ms[0], length); - bwexpand(weightdenum, lp, LPC_CHIRP_WEIGHTDENUM, lp_length); - - /* sub-frame 2 to 6: Interpolation between first - and second set of lsf coefficients */ - - pos = lp_length; - for (i = 1; i < iLBCenc_inst->nsub; i++) { - LSFinterpolate2a_enc(lp, lsfdeq, lsfdeq2, - lsf_weightTbl_30ms[i], length); - memcpy(syntdenum + pos,lp,lp_length*sizeof(float)); - - LSFinterpolate2a_enc(lp, lsf, lsf2, - lsf_weightTbl_30ms[i], length); - bwexpand(weightdenum + pos, lp, - LPC_CHIRP_WEIGHTDENUM, lp_length); - pos += lp_length; - } - } - else { - pos = 0; - for (i = 0; i < iLBCenc_inst->nsub; i++) { - LSFinterpolate2a_enc(lp, lsfdeqold, lsfdeq, - lsf_weightTbl_20ms[i], length); - memcpy(syntdenum+pos,lp,lp_length*sizeof(float)); - LSFinterpolate2a_enc(lp, lsfold, lsf, - lsf_weightTbl_20ms[i], length); - bwexpand(weightdenum+pos, lp, - LPC_CHIRP_WEIGHTDENUM, lp_length); - pos += lp_length; - } - } - - /* update memory */ - - if (iLBCenc_inst->mode==30) { - memcpy(lsfold, lsf2, length*sizeof(float)); - memcpy(lsfdeqold, lsfdeq2, length*sizeof(float)); - } - else { - memcpy(lsfold, lsf, length*sizeof(float)); - memcpy(lsfdeqold, lsfdeq, length*sizeof(float)); - } -} - -/*----------------------------------------------------------------* - * lsf quantizer (subrutine to LPCencode) - *---------------------------------------------------------------*/ - -static void SimplelsfQ( - float *lsfdeq, /* (o) dequantized lsf coefficients - (dimension FILTERORDER) */ - int *index, /* (o) quantization index */ - float *lsf, /* (i) the lsf coefficient vector to be - - - quantized (dimension FILTERORDER ) */ - int lpc_n /* (i) number of lsf sets to quantize */ -){ - /* Quantize first LSF with memoryless split VQ */ - SplitVQ(lsfdeq, index, lsf, lsfCbTbl, LSF_NSPLIT, - dim_lsfCbTbl, size_lsfCbTbl); - - if (lpc_n==2) { - /* Quantize second LSF with memoryless split VQ */ - SplitVQ(lsfdeq + LPC_FILTERORDER, index + LSF_NSPLIT, - lsf + LPC_FILTERORDER, lsfCbTbl, LSF_NSPLIT, - dim_lsfCbTbl, size_lsfCbTbl); - } -} - -/*----------------------------------------------------------------* - * lpc encoder - *---------------------------------------------------------------*/ - -void LPCencode( - float *syntdenum, /* (i/o) synthesis filter coefficients - before/after encoding */ - float *weightdenum, /* (i/o) weighting denumerator - coefficients before/after - encoding */ - int *lsf_index, /* (o) lsf quantization index */ - float *data, /* (i) lsf coefficients to quantize */ - iLBC_Enc_Inst_t *iLBCenc_inst - /* (i/o) the encoder state structure */ -){ - float lsf[LPC_FILTERORDER * LPC_N_MAX]; - float lsfdeq[LPC_FILTERORDER * LPC_N_MAX]; - int change=0; - - SimpleAnalysis(lsf, data, iLBCenc_inst); - SimplelsfQ(lsfdeq, lsf_index, lsf, iLBCenc_inst->lpc_n); - change=LSF_check(lsfdeq, LPC_FILTERORDER, iLBCenc_inst->lpc_n); - SimpleInterpolateLSF(syntdenum, weightdenum, - lsf, lsfdeq, iLBCenc_inst->lsfold, - iLBCenc_inst->lsfdeqold, LPC_FILTERORDER, iLBCenc_inst); -} - - - |