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 * This file contains the function WebRtcSpl_FilterMAFastQ12().
14 * The description header can be found in signal_processing_library.h
15 *
16 */
17
18 #include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
19
WebRtcSpl_FilterMAFastQ12(const int16_t * in_ptr,int16_t * out_ptr,const int16_t * B,size_t B_length,size_t length)20 void WebRtcSpl_FilterMAFastQ12(const int16_t* in_ptr,
21 int16_t* out_ptr,
22 const int16_t* B,
23 size_t B_length,
24 size_t length)
25 {
26 size_t i, j;
27 for (i = 0; i < length; i++)
28 {
29 int32_t o = 0;
30
31 for (j = 0; j < B_length; j++)
32 {
33 o += B[j] * in_ptr[i - j];
34 }
35
36 // If output is higher than 32768, saturate it. Same with negative side
37 // 2^27 = 134217728, which corresponds to 32768 in Q12
38
39 // Saturate the output
40 o = WEBRTC_SPL_SAT((int32_t)134215679, o, (int32_t)-134217728);
41
42 *out_ptr++ = (int16_t)((o + (int32_t)2048) >> 12);
43 }
44 return;
45 }
46