1 /*
2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 /******************************************************************
12
13 iLBC Speech Coder ANSI-C Source Code
14
15 WebRtcIlbcfix_Smooth_odata.c
16
17 ******************************************************************/
18
19 #include "modules/audio_coding/codecs/ilbc/smooth_out_data.h"
20
21 #include "modules/audio_coding/codecs/ilbc/constants.h"
22 #include "modules/audio_coding/codecs/ilbc/defines.h"
23 #include "rtc_base/sanitizer.h"
24
25 // An s32 + s32 -> s32 addition that's allowed to overflow. (It's still
26 // undefined behavior, so not a good idea; this just makes UBSan ignore the
27 // violation, so that our old code can continue to do what it's always been
28 // doing.)
29 static inline int32_t RTC_NO_SANITIZE("signed-integer-overflow")
OverflowingAdd_S32_S32_To_S32(int32_t a,int32_t b)30 OverflowingAdd_S32_S32_To_S32(int32_t a, int32_t b) {
31 return a + b;
32 }
33
WebRtcIlbcfix_Smooth_odata(int16_t * odata,int16_t * psseq,int16_t * surround,int16_t C)34 int32_t WebRtcIlbcfix_Smooth_odata(
35 int16_t *odata,
36 int16_t *psseq,
37 int16_t *surround,
38 int16_t C)
39 {
40 int i;
41
42 int16_t err;
43 int32_t errs;
44
45 for(i=0;i<80;i++) {
46 odata[i]= (int16_t)((C * surround[i] + 1024) >> 11);
47 }
48
49 errs=0;
50 for(i=0;i<80;i++) {
51 err = (psseq[i] - odata[i]) >> 3;
52 errs = OverflowingAdd_S32_S32_To_S32(errs, err * err); // errs in Q-6
53 }
54
55 return errs;
56 }
57