mirror of
https://github.com/oxen-io/session-android.git
synced 2024-11-25 02:55:23 +00:00
49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
/*
|
|
* 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_Interpolate.c
|
|
|
|
******************************************************************/
|
|
|
|
#include "defines.h"
|
|
#include "constants.h"
|
|
|
|
/*----------------------------------------------------------------*
|
|
* interpolation between vectors
|
|
*---------------------------------------------------------------*/
|
|
|
|
void WebRtcIlbcfix_Interpolate(
|
|
int16_t *out, /* (o) output vector */
|
|
int16_t *in1, /* (i) first input vector */
|
|
int16_t *in2, /* (i) second input vector */
|
|
int16_t coef, /* (i) weight coefficient in Q14 */
|
|
int16_t length) /* (i) number of sample is vectors */
|
|
{
|
|
int i;
|
|
int16_t invcoef;
|
|
|
|
/*
|
|
Performs the operation out[i] = in[i]*coef + (1-coef)*in2[i] (with rounding)
|
|
*/
|
|
|
|
invcoef = 16384 - coef; /* 16384 = 1.0 (Q14)*/
|
|
for (i = 0; i < length; i++) {
|
|
out[i] = (int16_t) WEBRTC_SPL_RSHIFT_W32(
|
|
(WEBRTC_SPL_MUL_16_16(coef, in1[i]) + WEBRTC_SPL_MUL_16_16(invcoef, in2[i]))+8192,
|
|
14);
|
|
}
|
|
|
|
return;
|
|
}
|