mirror of
https://github.com/oxen-io/session-android.git
synced 2024-12-19 14:37:32 +00:00
43 lines
1.4 KiB
C
43 lines
1.4 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_BwExpand.c
|
|
|
|
******************************************************************/
|
|
|
|
#include "defines.h"
|
|
|
|
/*----------------------------------------------------------------*
|
|
* lpc bandwidth expansion
|
|
*---------------------------------------------------------------*/
|
|
|
|
/* The output is in the same domain as the input */
|
|
void WebRtcIlbcfix_BwExpand(
|
|
int16_t *out, /* (o) the bandwidth expanded lpc coefficients */
|
|
int16_t *in, /* (i) the lpc coefficients before bandwidth
|
|
expansion */
|
|
int16_t *coef, /* (i) the bandwidth expansion factor Q15 */
|
|
int16_t length /* (i) the length of lpc coefficient vectors */
|
|
) {
|
|
int i;
|
|
|
|
out[0] = in[0];
|
|
for (i = 1; i < length; i++) {
|
|
/* out[i] = coef[i] * in[i] with rounding.
|
|
in[] and out[] are in Q12 and coef[] is in Q15
|
|
*/
|
|
out[i] = (int16_t)((WEBRTC_SPL_MUL_16_16(coef[i], in[i])+16384)>>15);
|
|
}
|
|
}
|