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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_EnhUpsample.c
******************************************************************/
#include "modules/audio_coding/codecs/ilbc/enh_upsample.h"
#include "modules/audio_coding/codecs/ilbc/constants.h"
#include "modules/audio_coding/codecs/ilbc/defines.h"
/*----------------------------------------------------------------*
* upsample finite array assuming zeros outside bounds
*---------------------------------------------------------------*/
void WebRtcIlbcfix_EnhUpsample(
int32_t *useq1, /* (o) upsampled output sequence */
int16_t *seq1 /* (i) unupsampled sequence */
){
int j;
int32_t *pu1, *pu11;
int16_t *ps, *w16tmp;
const int16_t *pp;
/* filtering: filter overhangs left side of sequence */
pu1=useq1;
for (j=0;j<ENH_UPS0; j++) {
pu11=pu1;
/* i = 2 */
pp=WebRtcIlbcfix_kEnhPolyPhaser[j]+1;
ps=seq1+2;
*pu11 = (*ps--) * *pp++;
*pu11 += (*ps--) * *pp++;
*pu11 += (*ps--) * *pp++;
pu11+=ENH_UPS0;
/* i = 3 */
pp=WebRtcIlbcfix_kEnhPolyPhaser[j]+1;
ps=seq1+3;
*pu11 = (*ps--) * *pp++;
*pu11 += (*ps--) * *pp++;
*pu11 += (*ps--) * *pp++;
*pu11 += (*ps--) * *pp++;
pu11+=ENH_UPS0;
/* i = 4 */
pp=WebRtcIlbcfix_kEnhPolyPhaser[j]+1;
ps=seq1+4;
*pu11 = (*ps--) * *pp++;
*pu11 += (*ps--) * *pp++;
*pu11 += (*ps--) * *pp++;
*pu11 += (*ps--) * *pp++;
*pu11 += (*ps--) * *pp++;
pu1++;
}
/* filtering: simple convolution=inner products
(not needed since the sequence is so short)
*/
/* filtering: filter overhangs right side of sequence */
/* Code with loops, which is equivivalent to the expanded version below
filterlength = 5;
hf1 = 2;
for(j=0;j<ENH_UPS0; j++){
pu = useq1 + (filterlength-hfl)*ENH_UPS0 + j;
for(i=1; i<=hfl; i++){
*pu=0;
pp = polyp[j]+i;
ps = seq1+dim1-1;
for(k=0;k<filterlength-i;k++) {
*pu += (*ps--) * *pp++;
}
pu+=ENH_UPS0;
}
}
*/
pu1 = useq1 + 12;
w16tmp = seq1+4;
for (j=0;j<ENH_UPS0; j++) {
pu11 = pu1;
/* i = 1 */
pp = WebRtcIlbcfix_kEnhPolyPhaser[j]+2;
ps = w16tmp;
*pu11 = (*ps--) * *pp++;
*pu11 += (*ps--) * *pp++;
*pu11 += (*ps--) * *pp++;
*pu11 += (*ps--) * *pp++;
pu11+=ENH_UPS0;
/* i = 2 */
pp = WebRtcIlbcfix_kEnhPolyPhaser[j]+3;
ps = w16tmp;
*pu11 = (*ps--) * *pp++;
*pu11 += (*ps--) * *pp++;
*pu11 += (*ps--) * *pp++;
pu11+=ENH_UPS0;
pu1++;
}
}