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49 lines
1.5 KiB
C
49 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_Interpolate.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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* interpolation between vectors
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*---------------------------------------------------------------*/
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void WebRtcIlbcfix_Interpolate(
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int16_t *out, /* (o) output vector */
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int16_t *in1, /* (i) first input vector */
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int16_t *in2, /* (i) second input vector */
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int16_t coef, /* (i) weight coefficient in Q14 */
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int16_t length) /* (i) number of sample is vectors */
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{
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int i;
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int16_t invcoef;
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/*
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Performs the operation out[i] = in[i]*coef + (1-coef)*in2[i] (with rounding)
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*/
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invcoef = 16384 - coef; /* 16384 = 1.0 (Q14)*/
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for (i = 0; i < length; i++) {
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out[i] = (int16_t) WEBRTC_SPL_RSHIFT_W32(
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(WEBRTC_SPL_MUL_16_16(coef, in1[i]) + WEBRTC_SPL_MUL_16_16(invcoef, in2[i]))+8192,
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14);
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}
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return;
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}
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