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/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
/******************************************************************
iLBC Speech Coder ANSI-C Source Code
WebRtcIlbcfix_GetSyncSeq.c
******************************************************************/
#include "defines.h"
#include "constants.h"
#include "refiner.h"
#include "nearest_neighbor.h"
/*----------------------------------------------------------------*
* get the pitch-synchronous sample sequence
*---------------------------------------------------------------*/
void WebRtcIlbcfix_GetSyncSeq(
int16_t *idata, /* (i) original data */
int16_t idatal, /* (i) dimension of data */
int16_t centerStartPos, /* (i) where current block starts */
int16_t *period, /* (i) rough-pitch-period array (Q-2) */
int16_t *plocs, /* (i) where periods of period array are taken (Q-2) */
int16_t periodl, /* (i) dimension period array */
int16_t hl, /* (i) 2*hl+1 is the number of sequences */
int16_t *surround /* (i/o) The contribution from this sequence
summed with earlier contributions */
){
int16_t i,centerEndPos,q;
/* Stack based */
int16_t lagBlock[2*ENH_HL+1];
int16_t blockStartPos[2*ENH_HL+1]; /* Defines the position to search around (Q2) */
int16_t plocs2[ENH_PLOCSL];
centerEndPos=centerStartPos+ENH_BLOCKL-1;
/* present (find predicted lag from this position) */
WebRtcIlbcfix_NearestNeighbor(lagBlock+hl,plocs,
(int16_t)WEBRTC_SPL_MUL_16_16(2, (centerStartPos+centerEndPos)),
periodl);
blockStartPos[hl]=(int16_t)WEBRTC_SPL_MUL_16_16(4, centerStartPos);
/* past (find predicted position and perform a refined
search to find the best sequence) */
for(q=hl-1;q>=0;q--) {
blockStartPos[q]=blockStartPos[q+1]-period[lagBlock[q+1]];
WebRtcIlbcfix_NearestNeighbor(lagBlock+q, plocs,
(int16_t)(blockStartPos[q] + (int16_t)WEBRTC_SPL_MUL_16_16(4, ENH_BLOCKL_HALF)-period[lagBlock[q+1]]),
periodl);
if((blockStartPos[q]-(int16_t)WEBRTC_SPL_MUL_16_16(4, ENH_OVERHANG))>=0) {
/* Find the best possible sequence in the 4 times upsampled
domain around blockStartPos+q */
WebRtcIlbcfix_Refiner(blockStartPos+q,idata,idatal,
centerStartPos,blockStartPos[q],surround,WebRtcIlbcfix_kEnhWt[q]);
} else {
/* Don't add anything since this sequence would
be outside the buffer */
}
}
/* future (find predicted position and perform a refined
search to find the best sequence) */
for(i=0;i<periodl;i++) {
plocs2[i]=(plocs[i]-period[i]);
}
for(q=hl+1;q<=WEBRTC_SPL_MUL_16_16(2, hl);q++) {
WebRtcIlbcfix_NearestNeighbor(lagBlock+q,plocs2,
(int16_t)(blockStartPos[q-1]+
(int16_t)WEBRTC_SPL_MUL_16_16(4, ENH_BLOCKL_HALF)),periodl);
blockStartPos[q]=blockStartPos[q-1]+period[lagBlock[q]];
if( (blockStartPos[q]+(int16_t)WEBRTC_SPL_MUL_16_16(4, (ENH_BLOCKL+ENH_OVERHANG)))
<
(int16_t)WEBRTC_SPL_MUL_16_16(4, idatal)) {
/* Find the best possible sequence in the 4 times upsampled
domain around blockStartPos+q */
WebRtcIlbcfix_Refiner(blockStartPos+q, idata, idatal,
centerStartPos,blockStartPos[q],surround,WebRtcIlbcfix_kEnhWt[2*hl-q]);
}
else {
/* Don't add anything since this sequence would
be outside the buffer */
}
}
}
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