void WebRtcIlbcfix_SimpleInterpolateLsf(
int16_t *syntdenum, /* (o) the synthesis filter denominator
resulting from the quantized
interpolated lsf Q12 */
int16_t *weightdenum, /* (o) the weighting filter denominator
resulting from the unquantized
interpolated lsf Q12 */
int16_t *lsf, /* (i) the unquantized lsf coefficients Q13 */
int16_t *lsfdeq, /* (i) the dequantized lsf coefficients Q13 */
int16_t *lsfold, /* (i) the unquantized lsf coefficients of
the previous signal frame Q13 */
int16_t *lsfdeqold, /* (i) the dequantized lsf coefficients of the
previous signal frame Q13 */
int16_t length /* (i) should equate FILTERORDER */
) {
int i, pos, lp_length;
int16_t *lsf2, *lsfdeq2;
/* Stack based */
int16_t lp[LPC_FILTERORDER + 1];
lsf2 = lsf + length;
lsfdeq2 = lsfdeq + length;
lp_length = length + 1;
pos = 0;
for (i = 0; i < 4; i++) {
/* Calculate Analysis/Syntehsis filter from quantized LSF */
WebRtcIlbcfix_LsfInterpolate2PloyEnc(lp, lsfdeqold, lsfdeq,
WebRtcIlbcfix_kLsfWeight20ms[i],
length);
WEBRTC_SPL_MEMCPY_W16(syntdenum + pos, lp, lp_length);
/* Calculate Weighting filter from quantized LSF */
WebRtcIlbcfix_LsfInterpolate2PloyEnc(lp, lsfold, lsf,
WebRtcIlbcfix_kLsfWeight20ms[i],
length);
WebRtcIlbcfix_BwExpand(weightdenum+pos, lp,
(int16_t*)WebRtcIlbcfix_kLpcChirpWeightDenum,
(int16_t)lp_length);
pos += lp_length;
}
/* update memory */
WEBRTC_SPL_MEMCPY_W16(lsfold, lsf, length);
WEBRTC_SPL_MEMCPY_W16(lsfdeqold, lsfdeq, length);
return;
}
void WebRtcIlbcfix_SimpleInterpolateLsf(
int16_t *syntdenum, /* (o) the synthesis filter denominator
resulting from the quantized
interpolated lsf Q12 */
int16_t *weightdenum, /* (o) the weighting filter denominator
resulting from the unquantized
interpolated lsf Q12 */
int16_t *lsf, /* (i) the unquantized lsf coefficients Q13 */
int16_t *lsfdeq, /* (i) the dequantized lsf coefficients Q13 */
int16_t *lsfold, /* (i) the unquantized lsf coefficients of
the previous signal frame Q13 */
int16_t *lsfdeqold, /* (i) the dequantized lsf coefficients of the
previous signal frame Q13 */
int16_t length, /* (i) should equate FILTERORDER */
iLBC_Enc_Inst_t *iLBCenc_inst
/* (i/o) the encoder state structure */
) {
int i, pos, lp_length;
int16_t *lsf2, *lsfdeq2;
/* Stack based */
int16_t lp[LPC_FILTERORDER + 1];
lsf2 = lsf + length;
lsfdeq2 = lsfdeq + length;
lp_length = length + 1;
if (iLBCenc_inst->mode==30) {
/* subframe 1: Interpolation between old and first set of
lsf coefficients */
/* Calculate Analysis/Syntehsis filter from quantized LSF */
WebRtcIlbcfix_LsfInterpolate2PloyEnc(lp, lsfdeqold, lsfdeq,
WebRtcIlbcfix_kLsfWeight30ms[0],
length);
WEBRTC_SPL_MEMCPY_W16(syntdenum, lp, lp_length);
/* Calculate Weighting filter from quantized LSF */
WebRtcIlbcfix_LsfInterpolate2PloyEnc(lp, lsfold, lsf,
WebRtcIlbcfix_kLsfWeight30ms[0],
length);
WebRtcIlbcfix_BwExpand(weightdenum, lp,
(int16_t*)WebRtcIlbcfix_kLpcChirpWeightDenum,
(int16_t)lp_length);
/* subframe 2 to 6: Interpolation between first and second
set of lsf coefficients */
pos = lp_length;
for (i = 1; i < iLBCenc_inst->nsub; i++) {
/* Calculate Analysis/Syntehsis filter from quantized LSF */
WebRtcIlbcfix_LsfInterpolate2PloyEnc(lp, lsfdeq, lsfdeq2,
WebRtcIlbcfix_kLsfWeight30ms[i],
length);
WEBRTC_SPL_MEMCPY_W16(syntdenum + pos, lp, lp_length);
/* Calculate Weighting filter from quantized LSF */
WebRtcIlbcfix_LsfInterpolate2PloyEnc(lp, lsf, lsf2,
WebRtcIlbcfix_kLsfWeight30ms[i],
length);
WebRtcIlbcfix_BwExpand(weightdenum + pos, lp,
(int16_t*)WebRtcIlbcfix_kLpcChirpWeightDenum,
(int16_t)lp_length);
pos += lp_length;
}
/* update memory */
WEBRTC_SPL_MEMCPY_W16(lsfold, lsf2, length);
WEBRTC_SPL_MEMCPY_W16(lsfdeqold, lsfdeq2, length);
} else { /* iLBCenc_inst->mode==20 */
pos = 0;
for (i = 0; i < iLBCenc_inst->nsub; i++) {
/* Calculate Analysis/Syntehsis filter from quantized LSF */
WebRtcIlbcfix_LsfInterpolate2PloyEnc(lp, lsfdeqold, lsfdeq,
WebRtcIlbcfix_kLsfWeight20ms[i],
length);
WEBRTC_SPL_MEMCPY_W16(syntdenum + pos, lp, lp_length);
/* Calculate Weighting filter from quantized LSF */
WebRtcIlbcfix_LsfInterpolate2PloyEnc(lp, lsfold, lsf,
WebRtcIlbcfix_kLsfWeight20ms[i],
length);
WebRtcIlbcfix_BwExpand(weightdenum+pos, lp,
(int16_t*)WebRtcIlbcfix_kLpcChirpWeightDenum,
(int16_t)lp_length);
pos += lp_length;
}
/* update memory */
WEBRTC_SPL_MEMCPY_W16(lsfold, lsf, length);
WEBRTC_SPL_MEMCPY_W16(lsfdeqold, lsfdeq, length);
}
return;
}
