14b43beb7c
TBR=niklas.enbom@webrtc.org Review URL: https://webrtc-codereview.appspot.com/915006 git-svn-id: http://webrtc.googlecode.com/svn/trunk@2963 4adac7df-926f-26a2-2b94-8c16560cd09d
83 lines
3.2 KiB
C
83 lines
3.2 KiB
C
/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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/******************************************************************
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iLBC Speech Coder ANSI-C Source Code
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WebRtcIlbcfix_DecoderInterpolateLsp.c
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******************************************************************/
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#include "lsf_interpolate_to_poly_dec.h"
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#include "bw_expand.h"
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#include "defines.h"
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#include "constants.h"
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/*----------------------------------------------------------------*
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* obtain synthesis and weighting filters form lsf coefficients
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*---------------------------------------------------------------*/
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void WebRtcIlbcfix_DecoderInterpolateLsp(
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WebRtc_Word16 *syntdenum, /* (o) synthesis filter coefficients */
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WebRtc_Word16 *weightdenum, /* (o) weighting denumerator
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coefficients */
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WebRtc_Word16 *lsfdeq, /* (i) dequantized lsf coefficients */
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WebRtc_Word16 length, /* (i) length of lsf coefficient vector */
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iLBC_Dec_Inst_t *iLBCdec_inst
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/* (i) the decoder state structure */
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){
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int i, pos, lp_length;
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WebRtc_Word16 lp[LPC_FILTERORDER + 1], *lsfdeq2;
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lsfdeq2 = lsfdeq + length;
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lp_length = length + 1;
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if (iLBCdec_inst->mode==30) {
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/* subframe 1: Interpolation between old and first LSF */
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WebRtcIlbcfix_LspInterpolate2PolyDec(lp, (*iLBCdec_inst).lsfdeqold, lsfdeq,
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WebRtcIlbcfix_kLsfWeight30ms[0], length);
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WEBRTC_SPL_MEMCPY_W16(syntdenum,lp,lp_length);
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WebRtcIlbcfix_BwExpand(weightdenum, lp, (WebRtc_Word16*)WebRtcIlbcfix_kLpcChirpSyntDenum, (WebRtc_Word16)lp_length);
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/* subframes 2 to 6: interpolation between first and last LSF */
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pos = lp_length;
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for (i = 1; i < 6; i++) {
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WebRtcIlbcfix_LspInterpolate2PolyDec(lp, lsfdeq, lsfdeq2,
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WebRtcIlbcfix_kLsfWeight30ms[i], length);
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WEBRTC_SPL_MEMCPY_W16(syntdenum + pos,lp,lp_length);
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WebRtcIlbcfix_BwExpand(weightdenum + pos, lp,
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(WebRtc_Word16*)WebRtcIlbcfix_kLpcChirpSyntDenum, (WebRtc_Word16)lp_length);
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pos += lp_length;
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}
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} else { /* iLBCdec_inst->mode=20 */
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/* subframes 1 to 4: interpolation between old and new LSF */
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pos = 0;
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for (i = 0; i < iLBCdec_inst->nsub; i++) {
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WebRtcIlbcfix_LspInterpolate2PolyDec(lp, iLBCdec_inst->lsfdeqold, lsfdeq,
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WebRtcIlbcfix_kLsfWeight20ms[i], length);
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WEBRTC_SPL_MEMCPY_W16(syntdenum+pos,lp,lp_length);
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WebRtcIlbcfix_BwExpand(weightdenum+pos, lp,
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(WebRtc_Word16*)WebRtcIlbcfix_kLpcChirpSyntDenum, (WebRtc_Word16)lp_length);
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pos += lp_length;
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}
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}
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/* update memory */
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if (iLBCdec_inst->mode==30) {
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WEBRTC_SPL_MEMCPY_W16(iLBCdec_inst->lsfdeqold, lsfdeq2, length);
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} else {
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WEBRTC_SPL_MEMCPY_W16(iLBCdec_inst->lsfdeqold, lsfdeq, length);
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}
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}
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