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52 lines
1.5 KiB
C
52 lines
1.5 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_InterpolateSamples.c
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******************************************************************/
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#include "defines.h"
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#include "constants.h"
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void WebRtcIlbcfix_InterpolateSamples(
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int16_t *interpSamples, /* (o) The interpolated samples */
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int16_t *CBmem, /* (i) The CB memory */
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int16_t lMem /* (i) Length of the CB memory */
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) {
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int16_t *ppi, *ppo, i, j, temp1, temp2;
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int16_t *tmpPtr;
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/* Calculate the 20 vectors of interpolated samples (4 samples each)
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that are used in the codebooks for lag 20 to 39 */
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tmpPtr = interpSamples;
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for (j=0; j<20; j++) {
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temp1 = 0;
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temp2 = 3;
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ppo = CBmem+lMem-4;
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ppi = CBmem+lMem-j-24;
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for (i=0; i<4; i++) {
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*tmpPtr++ = (int16_t)WEBRTC_SPL_MUL_16_16_RSFT(WebRtcIlbcfix_kAlpha[temp2],*ppo, 15) +
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(int16_t)WEBRTC_SPL_MUL_16_16_RSFT(WebRtcIlbcfix_kAlpha[temp1], *ppi, 15);
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ppo++;
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ppi++;
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temp1++;
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temp2--;
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}
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}
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return;
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}
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