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
109 lines
4.0 KiB
C
109 lines
4.0 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_GetSyncSeq.c
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******************************************************************/
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#include "defines.h"
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#include "constants.h"
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#include "refiner.h"
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#include "nearest_neighbor.h"
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/*----------------------------------------------------------------*
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* get the pitch-synchronous sample sequence
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*---------------------------------------------------------------*/
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void WebRtcIlbcfix_GetSyncSeq(
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WebRtc_Word16 *idata, /* (i) original data */
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WebRtc_Word16 idatal, /* (i) dimension of data */
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WebRtc_Word16 centerStartPos, /* (i) where current block starts */
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WebRtc_Word16 *period, /* (i) rough-pitch-period array (Q-2) */
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WebRtc_Word16 *plocs, /* (i) where periods of period array are taken (Q-2) */
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WebRtc_Word16 periodl, /* (i) dimension period array */
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WebRtc_Word16 hl, /* (i) 2*hl+1 is the number of sequences */
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WebRtc_Word16 *surround /* (i/o) The contribution from this sequence
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summed with earlier contributions */
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){
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WebRtc_Word16 i,centerEndPos,q;
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/* Stack based */
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WebRtc_Word16 lagBlock[2*ENH_HL+1];
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WebRtc_Word16 blockStartPos[2*ENH_HL+1]; /* Defines the position to search around (Q2) */
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WebRtc_Word16 plocs2[ENH_PLOCSL];
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centerEndPos=centerStartPos+ENH_BLOCKL-1;
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/* present (find predicted lag from this position) */
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WebRtcIlbcfix_NearestNeighbor(lagBlock+hl,plocs,
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(WebRtc_Word16)WEBRTC_SPL_MUL_16_16(2, (centerStartPos+centerEndPos)),
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periodl);
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blockStartPos[hl]=(WebRtc_Word16)WEBRTC_SPL_MUL_16_16(4, centerStartPos);
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/* past (find predicted position and perform a refined
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search to find the best sequence) */
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for(q=hl-1;q>=0;q--) {
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blockStartPos[q]=blockStartPos[q+1]-period[lagBlock[q+1]];
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WebRtcIlbcfix_NearestNeighbor(lagBlock+q, plocs,
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(WebRtc_Word16)(blockStartPos[q] + (WebRtc_Word16)WEBRTC_SPL_MUL_16_16(4, ENH_BLOCKL_HALF)-period[lagBlock[q+1]]),
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periodl);
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if((blockStartPos[q]-(WebRtc_Word16)WEBRTC_SPL_MUL_16_16(4, ENH_OVERHANG))>=0) {
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/* Find the best possible sequence in the 4 times upsampled
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domain around blockStartPos+q */
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WebRtcIlbcfix_Refiner(blockStartPos+q,idata,idatal,
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centerStartPos,blockStartPos[q],surround,WebRtcIlbcfix_kEnhWt[q]);
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} else {
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/* Don't add anything since this sequence would
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be outside the buffer */
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}
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}
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/* future (find predicted position and perform a refined
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search to find the best sequence) */
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for(i=0;i<periodl;i++) {
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plocs2[i]=(plocs[i]-period[i]);
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}
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for(q=hl+1;q<=WEBRTC_SPL_MUL_16_16(2, hl);q++) {
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WebRtcIlbcfix_NearestNeighbor(lagBlock+q,plocs2,
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(WebRtc_Word16)(blockStartPos[q-1]+
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(WebRtc_Word16)WEBRTC_SPL_MUL_16_16(4, ENH_BLOCKL_HALF)),periodl);
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blockStartPos[q]=blockStartPos[q-1]+period[lagBlock[q]];
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if( (blockStartPos[q]+(WebRtc_Word16)WEBRTC_SPL_MUL_16_16(4, (ENH_BLOCKL+ENH_OVERHANG)))
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<
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(WebRtc_Word16)WEBRTC_SPL_MUL_16_16(4, idatal)) {
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/* Find the best possible sequence in the 4 times upsampled
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domain around blockStartPos+q */
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WebRtcIlbcfix_Refiner(blockStartPos+q, idata, idatal,
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centerStartPos,blockStartPos[q],surround,WebRtcIlbcfix_kEnhWt[2*hl-q]);
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}
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else {
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/* Don't add anything since this sequence would
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be outside the buffer */
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}
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}
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}
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