mirror of
https://github.com/oxen-io/session-android.git
synced 2024-11-28 12:35:17 +00:00
66 lines
2.1 KiB
C
66 lines
2.1 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_Window32W32.c
|
|
|
|
******************************************************************/
|
|
|
|
#include "defines.h"
|
|
|
|
/*----------------------------------------------------------------*
|
|
* window multiplication
|
|
*---------------------------------------------------------------*/
|
|
|
|
void WebRtcIlbcfix_Window32W32(
|
|
int32_t *z, /* Output */
|
|
int32_t *x, /* Input (same domain as Output)*/
|
|
const int32_t *y, /* Q31 Window */
|
|
int16_t N /* length to process */
|
|
) {
|
|
int16_t i;
|
|
int16_t x_low, x_hi, y_low, y_hi;
|
|
int16_t left_shifts;
|
|
int32_t temp;
|
|
|
|
left_shifts = (int16_t)WebRtcSpl_NormW32(x[0]);
|
|
WebRtcSpl_VectorBitShiftW32(x, N, x, (int16_t)(-left_shifts));
|
|
|
|
|
|
/* The double precision numbers use a special representation:
|
|
* w32 = hi<<16 + lo<<1
|
|
*/
|
|
for (i = 0; i < N; i++) {
|
|
/* Extract higher bytes */
|
|
x_hi = (int16_t) WEBRTC_SPL_RSHIFT_W32(x[i], 16);
|
|
y_hi = (int16_t) WEBRTC_SPL_RSHIFT_W32(y[i], 16);
|
|
|
|
/* Extract lower bytes, defined as (w32 - hi<<16)>>1 */
|
|
temp = WEBRTC_SPL_LSHIFT_W32((int32_t)x_hi, 16);
|
|
x_low = (int16_t) WEBRTC_SPL_RSHIFT_W32((x[i] - temp), 1);
|
|
|
|
temp = WEBRTC_SPL_LSHIFT_W32((int32_t)y_hi, 16);
|
|
y_low = (int16_t) WEBRTC_SPL_RSHIFT_W32((y[i] - temp), 1);
|
|
|
|
/* Calculate z by a 32 bit multiplication using both low and high from x and y */
|
|
temp = WEBRTC_SPL_LSHIFT_W32(WEBRTC_SPL_MUL_16_16(x_hi, y_hi), 1);
|
|
temp = (temp + (WEBRTC_SPL_MUL_16_16_RSFT(x_hi, y_low, 14)));
|
|
|
|
z[i] = (temp + (WEBRTC_SPL_MUL_16_16_RSFT(x_low, y_hi, 14)));
|
|
}
|
|
|
|
WebRtcSpl_VectorBitShiftW32(z, N, z, left_shifts);
|
|
|
|
return;
|
|
}
|