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 resampling functions between 48 kHz and nb/wb.
14 * The description header can be found in signal_processing_library.h
15 *
16 */
17
18 #include <string.h>
19 #include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
20 #include "webrtc/common_audio/signal_processing/resample_by_2_internal.h"
21
22 ////////////////////////////
23 ///// 48 kHz -> 16 kHz /////
24 ////////////////////////////
25
26 // 48 -> 16 resampler
WebRtcSpl_Resample48khzTo16khz(const int16_t * in,int16_t * out,WebRtcSpl_State48khzTo16khz * state,int32_t * tmpmem)27 void WebRtcSpl_Resample48khzTo16khz(const int16_t* in, int16_t* out,
28 WebRtcSpl_State48khzTo16khz* state, int32_t* tmpmem)
29 {
30 ///// 48 --> 48(LP) /////
31 // int16_t in[480]
32 // int32_t out[480]
33 /////
34 WebRtcSpl_LPBy2ShortToInt(in, 480, tmpmem + 16, state->S_48_48);
35
36 ///// 48 --> 32 /////
37 // int32_t in[480]
38 // int32_t out[320]
39 /////
40 // copy state to and from input array
41 memcpy(tmpmem + 8, state->S_48_32, 8 * sizeof(int32_t));
42 memcpy(state->S_48_32, tmpmem + 488, 8 * sizeof(int32_t));
43 WebRtcSpl_Resample48khzTo32khz(tmpmem + 8, tmpmem, 160);
44
45 ///// 32 --> 16 /////
46 // int32_t in[320]
47 // int16_t out[160]
48 /////
49 WebRtcSpl_DownBy2IntToShort(tmpmem, 320, out, state->S_32_16);
50 }
51
52 // initialize state of 48 -> 16 resampler
WebRtcSpl_ResetResample48khzTo16khz(WebRtcSpl_State48khzTo16khz * state)53 void WebRtcSpl_ResetResample48khzTo16khz(WebRtcSpl_State48khzTo16khz* state)
54 {
55 memset(state->S_48_48, 0, 16 * sizeof(int32_t));
56 memset(state->S_48_32, 0, 8 * sizeof(int32_t));
57 memset(state->S_32_16, 0, 8 * sizeof(int32_t));
58 }
59
60 ////////////////////////////
61 ///// 16 kHz -> 48 kHz /////
62 ////////////////////////////
63
64 // 16 -> 48 resampler
WebRtcSpl_Resample16khzTo48khz(const int16_t * in,int16_t * out,WebRtcSpl_State16khzTo48khz * state,int32_t * tmpmem)65 void WebRtcSpl_Resample16khzTo48khz(const int16_t* in, int16_t* out,
66 WebRtcSpl_State16khzTo48khz* state, int32_t* tmpmem)
67 {
68 ///// 16 --> 32 /////
69 // int16_t in[160]
70 // int32_t out[320]
71 /////
72 WebRtcSpl_UpBy2ShortToInt(in, 160, tmpmem + 16, state->S_16_32);
73
74 ///// 32 --> 24 /////
75 // int32_t in[320]
76 // int32_t out[240]
77 // copy state to and from input array
78 /////
79 memcpy(tmpmem + 8, state->S_32_24, 8 * sizeof(int32_t));
80 memcpy(state->S_32_24, tmpmem + 328, 8 * sizeof(int32_t));
81 WebRtcSpl_Resample32khzTo24khz(tmpmem + 8, tmpmem, 80);
82
83 ///// 24 --> 48 /////
84 // int32_t in[240]
85 // int16_t out[480]
86 /////
87 WebRtcSpl_UpBy2IntToShort(tmpmem, 240, out, state->S_24_48);
88 }
89
90 // initialize state of 16 -> 48 resampler
WebRtcSpl_ResetResample16khzTo48khz(WebRtcSpl_State16khzTo48khz * state)91 void WebRtcSpl_ResetResample16khzTo48khz(WebRtcSpl_State16khzTo48khz* state)
92 {
93 memset(state->S_16_32, 0, 8 * sizeof(int32_t));
94 memset(state->S_32_24, 0, 8 * sizeof(int32_t));
95 memset(state->S_24_48, 0, 8 * sizeof(int32_t));
96 }
97
98 ////////////////////////////
99 ///// 48 kHz -> 8 kHz /////
100 ////////////////////////////
101
102 // 48 -> 8 resampler
WebRtcSpl_Resample48khzTo8khz(const int16_t * in,int16_t * out,WebRtcSpl_State48khzTo8khz * state,int32_t * tmpmem)103 void WebRtcSpl_Resample48khzTo8khz(const int16_t* in, int16_t* out,
104 WebRtcSpl_State48khzTo8khz* state, int32_t* tmpmem)
105 {
106 ///// 48 --> 24 /////
107 // int16_t in[480]
108 // int32_t out[240]
109 /////
110 WebRtcSpl_DownBy2ShortToInt(in, 480, tmpmem + 256, state->S_48_24);
111
112 ///// 24 --> 24(LP) /////
113 // int32_t in[240]
114 // int32_t out[240]
115 /////
116 WebRtcSpl_LPBy2IntToInt(tmpmem + 256, 240, tmpmem + 16, state->S_24_24);
117
118 ///// 24 --> 16 /////
119 // int32_t in[240]
120 // int32_t out[160]
121 /////
122 // copy state to and from input array
123 memcpy(tmpmem + 8, state->S_24_16, 8 * sizeof(int32_t));
124 memcpy(state->S_24_16, tmpmem + 248, 8 * sizeof(int32_t));
125 WebRtcSpl_Resample48khzTo32khz(tmpmem + 8, tmpmem, 80);
126
127 ///// 16 --> 8 /////
128 // int32_t in[160]
129 // int16_t out[80]
130 /////
131 WebRtcSpl_DownBy2IntToShort(tmpmem, 160, out, state->S_16_8);
132 }
133
134 // initialize state of 48 -> 8 resampler
WebRtcSpl_ResetResample48khzTo8khz(WebRtcSpl_State48khzTo8khz * state)135 void WebRtcSpl_ResetResample48khzTo8khz(WebRtcSpl_State48khzTo8khz* state)
136 {
137 memset(state->S_48_24, 0, 8 * sizeof(int32_t));
138 memset(state->S_24_24, 0, 16 * sizeof(int32_t));
139 memset(state->S_24_16, 0, 8 * sizeof(int32_t));
140 memset(state->S_16_8, 0, 8 * sizeof(int32_t));
141 }
142
143 ////////////////////////////
144 ///// 8 kHz -> 48 kHz /////
145 ////////////////////////////
146
147 // 8 -> 48 resampler
WebRtcSpl_Resample8khzTo48khz(const int16_t * in,int16_t * out,WebRtcSpl_State8khzTo48khz * state,int32_t * tmpmem)148 void WebRtcSpl_Resample8khzTo48khz(const int16_t* in, int16_t* out,
149 WebRtcSpl_State8khzTo48khz* state, int32_t* tmpmem)
150 {
151 ///// 8 --> 16 /////
152 // int16_t in[80]
153 // int32_t out[160]
154 /////
155 WebRtcSpl_UpBy2ShortToInt(in, 80, tmpmem + 264, state->S_8_16);
156
157 ///// 16 --> 12 /////
158 // int32_t in[160]
159 // int32_t out[120]
160 /////
161 // copy state to and from input array
162 memcpy(tmpmem + 256, state->S_16_12, 8 * sizeof(int32_t));
163 memcpy(state->S_16_12, tmpmem + 416, 8 * sizeof(int32_t));
164 WebRtcSpl_Resample32khzTo24khz(tmpmem + 256, tmpmem + 240, 40);
165
166 ///// 12 --> 24 /////
167 // int32_t in[120]
168 // int16_t out[240]
169 /////
170 WebRtcSpl_UpBy2IntToInt(tmpmem + 240, 120, tmpmem, state->S_12_24);
171
172 ///// 24 --> 48 /////
173 // int32_t in[240]
174 // int16_t out[480]
175 /////
176 WebRtcSpl_UpBy2IntToShort(tmpmem, 240, out, state->S_24_48);
177 }
178
179 // initialize state of 8 -> 48 resampler
WebRtcSpl_ResetResample8khzTo48khz(WebRtcSpl_State8khzTo48khz * state)180 void WebRtcSpl_ResetResample8khzTo48khz(WebRtcSpl_State8khzTo48khz* state)
181 {
182 memset(state->S_8_16, 0, 8 * sizeof(int32_t));
183 memset(state->S_16_12, 0, 8 * sizeof(int32_t));
184 memset(state->S_12_24, 0, 8 * sizeof(int32_t));
185 memset(state->S_24_48, 0, 8 * sizeof(int32_t));
186 }
187