mirror of
https://github.com/mollyim/webrtc.git
synced 2025-05-14 14:20:45 +01:00
bb547203bf
In order to eliminate the WebRTC Subtree mirror in Chromium, WebRTC is moving the content of the src/webrtc directory up to the src/ directory. NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true TBR=tommi@webrtc.org Bug: chromium:611808 Change-Id: Iac59c5b51b950f174119565bac87955a7994bc38 Reviewed-on: https://webrtc-review.googlesource.com/1560 Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Henrik Kjellander <kjellander@webrtc.org> Cr-Commit-Position: refs/heads/master@{#19845}
62 lines
1.8 KiB
C
62 lines
1.8 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 */
|
|
size_t N /* length to process */
|
|
) {
|
|
size_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)(x[i] >> 16);
|
|
y_hi = (int16_t)(y[i] >> 16);
|
|
|
|
/* Extract lower bytes, defined as (w32 - hi<<16)>>1 */
|
|
x_low = (int16_t)((x[i] - (x_hi << 16)) >> 1);
|
|
|
|
y_low = (int16_t)((y[i] - (y_hi << 16)) >> 1);
|
|
|
|
/* Calculate z by a 32 bit multiplication using both low and high from x and y */
|
|
temp = ((x_hi * y_hi) << 1) + ((x_hi * y_low) >> 14);
|
|
|
|
z[i] = temp + ((x_low * y_hi) >> 14);
|
|
}
|
|
|
|
WebRtcSpl_VectorBitShiftW32(z, N, z, left_shifts);
|
|
|
|
return;
|
|
}
|