mirror of
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111 lines
3.2 KiB
C
111 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_EnhUpsample.c
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******************************************************************/
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#include "defines.h"
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#include "constants.h"
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/*----------------------------------------------------------------*
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* upsample finite array assuming zeros outside bounds
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*---------------------------------------------------------------*/
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void WebRtcIlbcfix_EnhUpsample(
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int32_t *useq1, /* (o) upsampled output sequence */
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int16_t *seq1 /* (i) unupsampled sequence */
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){
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int j;
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int32_t *pu1, *pu11;
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int16_t *ps, *w16tmp;
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const int16_t *pp;
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/* filtering: filter overhangs left side of sequence */
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pu1=useq1;
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for (j=0;j<ENH_UPS0; j++) {
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pu11=pu1;
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/* i = 2 */
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pp=WebRtcIlbcfix_kEnhPolyPhaser[j]+1;
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ps=seq1+2;
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(*pu11) = WEBRTC_SPL_MUL_16_16(*ps--,*pp++);
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(*pu11) += WEBRTC_SPL_MUL_16_16(*ps--,*pp++);
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(*pu11) += WEBRTC_SPL_MUL_16_16(*ps--,*pp++);
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pu11+=ENH_UPS0;
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/* i = 3 */
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pp=WebRtcIlbcfix_kEnhPolyPhaser[j]+1;
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ps=seq1+3;
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(*pu11) = WEBRTC_SPL_MUL_16_16(*ps--,*pp++);
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(*pu11) += WEBRTC_SPL_MUL_16_16(*ps--,*pp++);
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(*pu11) += WEBRTC_SPL_MUL_16_16(*ps--,*pp++);
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(*pu11) += WEBRTC_SPL_MUL_16_16(*ps--,*pp++);
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pu11+=ENH_UPS0;
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/* i = 4 */
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pp=WebRtcIlbcfix_kEnhPolyPhaser[j]+1;
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ps=seq1+4;
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(*pu11) = WEBRTC_SPL_MUL_16_16(*ps--,*pp++);
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(*pu11) += WEBRTC_SPL_MUL_16_16(*ps--,*pp++);
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(*pu11) += WEBRTC_SPL_MUL_16_16(*ps--,*pp++);
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(*pu11) += WEBRTC_SPL_MUL_16_16(*ps--,*pp++);
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(*pu11) += WEBRTC_SPL_MUL_16_16(*ps--,*pp++);
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pu1++;
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}
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/* filtering: simple convolution=inner products
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(not needed since the sequence is so short)
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*/
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/* filtering: filter overhangs right side of sequence */
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/* Code with loops, which is equivivalent to the expanded version below
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filterlength = 5;
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hf1 = 2;
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for(j=0;j<ENH_UPS0; j++){
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pu = useq1 + (filterlength-hfl)*ENH_UPS0 + j;
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for(i=1; i<=hfl; i++){
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*pu=0;
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pp = polyp[j]+i;
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ps = seq1+dim1-1;
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for(k=0;k<filterlength-i;k++) {
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*pu += WEBRTC_SPL_MUL_16_16(*ps--, *pp++);
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}
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pu+=ENH_UPS0;
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}
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}
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*/
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pu1 = useq1 + 12;
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w16tmp = seq1+4;
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for (j=0;j<ENH_UPS0; j++) {
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pu11 = pu1;
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/* i = 1 */
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pp = WebRtcIlbcfix_kEnhPolyPhaser[j]+2;
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ps = w16tmp;
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(*pu11) = WEBRTC_SPL_MUL_16_16(*ps--, *pp++);
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(*pu11) += WEBRTC_SPL_MUL_16_16(*ps--, *pp++);
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(*pu11) += WEBRTC_SPL_MUL_16_16(*ps--, *pp++);
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(*pu11) += WEBRTC_SPL_MUL_16_16(*ps--, *pp++);
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pu11+=ENH_UPS0;
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/* i = 2 */
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pp = WebRtcIlbcfix_kEnhPolyPhaser[j]+3;
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ps = w16tmp;
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(*pu11) = WEBRTC_SPL_MUL_16_16(*ps--, *pp++);
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(*pu11) += WEBRTC_SPL_MUL_16_16(*ps--, *pp++);
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(*pu11) += WEBRTC_SPL_MUL_16_16(*ps--, *pp++);
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pu11+=ENH_UPS0;
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pu1++;
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}
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}
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