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));
}
static void SimpleAnalysis(float *lsf, /* (o) lsf coefficients */
float *data, /* (i) new data vector */
ilbc_encode_state_t *iLBCenc_inst) /* (i/o) the encoder state structure */
{
int k;
int is;
float temp[ILBC_BLOCK_LEN_MAX];
float lp[ILBC_LPC_FILTERORDER + 1];
float lp2[ILBC_LPC_FILTERORDER + 1];
float r[ILBC_LPC_FILTERORDER + 1];
is = LPC_LOOKBACK + ILBC_BLOCK_LEN_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, ILBC_BLOCK_LEN_MAX);
else
window(temp, lpc_asymwinTbl, iLBCenc_inst->lpc_buffer + is, ILBC_BLOCK_LEN_MAX);
autocorr(r, temp, ILBC_BLOCK_LEN_MAX, ILBC_LPC_FILTERORDER);
window(r, r, lpc_lagwinTbl, ILBC_LPC_FILTERORDER + 1);
levdurb(lp, temp, r, ILBC_LPC_FILTERORDER);
bwexpand(lp2, lp, LPC_CHIRP_SYNTDENUM, ILBC_LPC_FILTERORDER + 1);
a2lsf(lsf + k*ILBC_LPC_FILTERORDER, lp2);
}
is = LPC_LOOKBACK + ILBC_BLOCK_LEN_MAX - iLBCenc_inst->blockl;
memmove(iLBCenc_inst->lpc_buffer,
iLBCenc_inst->lpc_buffer + LPC_LOOKBACK + ILBC_BLOCK_LEN_MAX - is,
is*sizeof(float));
}
