Line data Source code
1 : /*
2 : * Copyright (c) 2012 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 implementations of the functions
14 : * WebRtcSpl_VectorBitShiftW16()
15 : * WebRtcSpl_VectorBitShiftW32()
16 : * WebRtcSpl_VectorBitShiftW32ToW16()
17 : * WebRtcSpl_ScaleVector()
18 : * WebRtcSpl_ScaleVectorWithSat()
19 : * WebRtcSpl_ScaleAndAddVectors()
20 : * WebRtcSpl_ScaleAndAddVectorsWithRoundC()
21 : */
22 :
23 : #include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
24 :
25 0 : void WebRtcSpl_VectorBitShiftW16(int16_t *res, size_t length,
26 : const int16_t *in, int16_t right_shifts)
27 : {
28 : size_t i;
29 :
30 0 : if (right_shifts > 0)
31 : {
32 0 : for (i = length; i > 0; i--)
33 : {
34 0 : (*res++) = ((*in++) >> right_shifts);
35 : }
36 : } else
37 : {
38 0 : for (i = length; i > 0; i--)
39 : {
40 0 : (*res++) = ((*in++) * (1 << (-right_shifts)));
41 : }
42 : }
43 0 : }
44 :
45 0 : void WebRtcSpl_VectorBitShiftW32(int32_t *out_vector,
46 : size_t vector_length,
47 : const int32_t *in_vector,
48 : int16_t right_shifts)
49 : {
50 : size_t i;
51 :
52 0 : if (right_shifts > 0)
53 : {
54 0 : for (i = vector_length; i > 0; i--)
55 : {
56 0 : (*out_vector++) = ((*in_vector++) >> right_shifts);
57 : }
58 : } else
59 : {
60 0 : for (i = vector_length; i > 0; i--)
61 : {
62 0 : (*out_vector++) = ((*in_vector++) << (-right_shifts));
63 : }
64 : }
65 0 : }
66 :
67 0 : void WebRtcSpl_VectorBitShiftW32ToW16(int16_t* out, size_t length,
68 : const int32_t* in, int right_shifts) {
69 : size_t i;
70 : int32_t tmp_w32;
71 :
72 0 : if (right_shifts >= 0) {
73 0 : for (i = length; i > 0; i--) {
74 0 : tmp_w32 = (*in++) >> right_shifts;
75 0 : (*out++) = WebRtcSpl_SatW32ToW16(tmp_w32);
76 : }
77 : } else {
78 0 : int left_shifts = -right_shifts;
79 0 : for (i = length; i > 0; i--) {
80 0 : tmp_w32 = (*in++) << left_shifts;
81 0 : (*out++) = WebRtcSpl_SatW32ToW16(tmp_w32);
82 : }
83 : }
84 0 : }
85 :
86 0 : void WebRtcSpl_ScaleVector(const int16_t *in_vector, int16_t *out_vector,
87 : int16_t gain, size_t in_vector_length,
88 : int16_t right_shifts)
89 : {
90 : // Performs vector operation: out_vector = (gain*in_vector)>>right_shifts
91 : size_t i;
92 : const int16_t *inptr;
93 : int16_t *outptr;
94 :
95 0 : inptr = in_vector;
96 0 : outptr = out_vector;
97 :
98 0 : for (i = 0; i < in_vector_length; i++)
99 : {
100 0 : *outptr++ = (int16_t)((*inptr++ * gain) >> right_shifts);
101 : }
102 0 : }
103 :
104 0 : void WebRtcSpl_ScaleVectorWithSat(const int16_t *in_vector, int16_t *out_vector,
105 : int16_t gain, size_t in_vector_length,
106 : int16_t right_shifts)
107 : {
108 : // Performs vector operation: out_vector = (gain*in_vector)>>right_shifts
109 : size_t i;
110 : const int16_t *inptr;
111 : int16_t *outptr;
112 :
113 0 : inptr = in_vector;
114 0 : outptr = out_vector;
115 :
116 0 : for (i = 0; i < in_vector_length; i++) {
117 0 : *outptr++ = WebRtcSpl_SatW32ToW16((*inptr++ * gain) >> right_shifts);
118 : }
119 0 : }
120 :
121 0 : void WebRtcSpl_ScaleAndAddVectors(const int16_t *in1, int16_t gain1, int shift1,
122 : const int16_t *in2, int16_t gain2, int shift2,
123 : int16_t *out, size_t vector_length)
124 : {
125 : // Performs vector operation: out = (gain1*in1)>>shift1 + (gain2*in2)>>shift2
126 : size_t i;
127 : const int16_t *in1ptr;
128 : const int16_t *in2ptr;
129 : int16_t *outptr;
130 :
131 0 : in1ptr = in1;
132 0 : in2ptr = in2;
133 0 : outptr = out;
134 :
135 0 : for (i = 0; i < vector_length; i++)
136 : {
137 0 : *outptr++ = (int16_t)((gain1 * *in1ptr++) >> shift1) +
138 0 : (int16_t)((gain2 * *in2ptr++) >> shift2);
139 : }
140 0 : }
141 :
142 : // C version of WebRtcSpl_ScaleAndAddVectorsWithRound() for generic platforms.
143 0 : int WebRtcSpl_ScaleAndAddVectorsWithRoundC(const int16_t* in_vector1,
144 : int16_t in_vector1_scale,
145 : const int16_t* in_vector2,
146 : int16_t in_vector2_scale,
147 : int right_shifts,
148 : int16_t* out_vector,
149 : size_t length) {
150 0 : size_t i = 0;
151 0 : int round_value = (1 << right_shifts) >> 1;
152 :
153 0 : if (in_vector1 == NULL || in_vector2 == NULL || out_vector == NULL ||
154 0 : length == 0 || right_shifts < 0) {
155 0 : return -1;
156 : }
157 :
158 0 : for (i = 0; i < length; i++) {
159 0 : out_vector[i] = (int16_t)((
160 0 : in_vector1[i] * in_vector1_scale + in_vector2[i] * in_vector2_scale +
161 0 : round_value) >> right_shifts);
162 : }
163 :
164 0 : return 0;
165 : }
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