mirror of
https://github.com/oxen-io/session-android.git
synced 2024-12-30 11:47:45 +00:00
49 lines
1.2 KiB
C
49 lines
1.2 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "cng_helpfuns.h"
|
||
|
|
|
||
|
|
#include "signal_processing_library.h"
|
||
|
|
#include "typedefs.h"
|
||
|
|
#include "webrtc_cng.h"
|
||
|
|
|
||
|
|
/* Values in |k| are Q15, and |a| Q12. */
|
||
|
|
void WebRtcCng_K2a16(int16_t* k, int useOrder, int16_t* a) {
|
||
|
|
int16_t any[WEBRTC_SPL_MAX_LPC_ORDER + 1];
|
||
|
|
int16_t *aptr, *aptr2, *anyptr;
|
||
|
|
const int16_t *kptr;
|
||
|
|
int m, i;
|
||
|
|
|
||
|
|
kptr = k;
|
||
|
|
*a = 4096; /* i.e., (Word16_MAX >> 3) + 1 */
|
||
|
|
*any = *a;
|
||
|
|
a[1] = (*k + 4) >> 3;
|
||
|
|
for (m = 1; m < useOrder; m++) {
|
||
|
|
kptr++;
|
||
|
|
aptr = a;
|
||
|
|
aptr++;
|
||
|
|
aptr2 = &a[m];
|
||
|
|
anyptr = any;
|
||
|
|
anyptr++;
|
||
|
|
|
||
|
|
any[m + 1] = (*kptr + 4) >> 3;
|
||
|
|
for (i = 0; i < m; i++) {
|
||
|
|
*anyptr++ = (*aptr++) +
|
||
|
|
(int16_t)((((int32_t)(*aptr2--) * (int32_t) * kptr) + 16384) >> 15);
|
||
|
|
}
|
||
|
|
|
||
|
|
aptr = a;
|
||
|
|
anyptr = any;
|
||
|
|
for (i = 0; i < (m + 2); i++) {
|
||
|
|
*aptr++ = *anyptr++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|