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1 /* Copyright (C) 2003 Epic Games
2    Written by Jean-Marc Valin */
3 /**
4  *  @file speex_preprocess.h
5  *  @brief Speex preprocessor. The preprocess can do noise suppression,
6  * residual echo suppression (after using the echo canceller), automatic
7  * gain control (AGC) and voice activity detection (VAD).
8 */
9 /*
10    Redistribution and use in source and binary forms, with or without
11    modification, are permitted provided that the following conditions are
12    met:
13 
14    1. Redistributions of source code must retain the above copyright notice,
15    this list of conditions and the following disclaimer.
16 
17    2. Redistributions in binary form must reproduce the above copyright
18    notice, this list of conditions and the following disclaimer in the
19    documentation and/or other materials provided with the distribution.
20 
21    3. The name of the author may not be used to endorse or promote products
22    derived from this software without specific prior written permission.
23 
24    THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27    DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
28    INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
29    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
30    SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
32    STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
33    ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34    POSSIBILITY OF SUCH DAMAGE.
35 */
36 
37 #ifndef SPEEX_PREPROCESS_H
38 #define SPEEX_PREPROCESS_H
39 /** @defgroup SpeexPreprocessState SpeexPreprocessState: The Speex preprocessor
40  *  This is the Speex preprocessor. The preprocess can do noise suppression,
41  * residual echo suppression (after using the echo canceller), automatic
42  * gain control (AGC) and voice activity detection (VAD).
43  *  @{
44  */
45 
46 #include "speexdsp_types.h"
47 
48 #ifdef __cplusplus
49 extern "C" {
50 #endif
51 
52 /** State of the preprocessor (one per channel). Should never be accessed directly. */
53 struct SpeexPreprocessState_;
54 
55 /** State of the preprocessor (one per channel). Should never be accessed directly. */
56 typedef struct SpeexPreprocessState_ SpeexPreprocessState;
57 
58 
59 /** Creates a new preprocessing state. You MUST create one state per channel processed.
60  * @param frame_size Number of samples to process at one time (should correspond to 10-20 ms). Must be
61  * the same value as that used for the echo canceller for residual echo cancellation to work.
62  * @param sampling_rate Sampling rate used for the input.
63  * @return Newly created preprocessor state
64 */
65 SpeexPreprocessState *speex_preprocess_state_init(int frame_size, int sampling_rate);
66 
67 /** Destroys a preprocessor state
68  * @param st Preprocessor state to destroy
69 */
70 void speex_preprocess_state_destroy(SpeexPreprocessState *st);
71 
72 /** Preprocess a frame
73  * @param st Preprocessor state
74  * @param x Audio sample vector (in and out). Must be same size as specified in speex_preprocess_state_init().
75  * @return Bool value for voice activity (1 for speech, 0 for noise/silence), ONLY if VAD turned on.
76 */
77 int speex_preprocess_run(SpeexPreprocessState *st, spx_int16_t *x);
78 
79 /** Preprocess a frame (deprecated, use speex_preprocess_run() instead)*/
80 int speex_preprocess(SpeexPreprocessState *st, spx_int16_t *x, spx_int32_t *echo);
81 
82 /** Update preprocessor state, but do not compute the output
83  * @param st Preprocessor state
84  * @param x Audio sample vector (in only). Must be same size as specified in speex_preprocess_state_init().
85 */
86 void speex_preprocess_estimate_update(SpeexPreprocessState *st, spx_int16_t *x);
87 
88 /** Used like the ioctl function to control the preprocessor parameters
89  * @param st Preprocessor state
90  * @param request ioctl-type request (one of the SPEEX_PREPROCESS_* macros)
91  * @param ptr Data exchanged to-from function
92  * @return 0 if no error, -1 if request in unknown
93 */
94 int speex_preprocess_ctl(SpeexPreprocessState *st, int request, void *ptr);
95 
96 
97 
98 /** Set preprocessor denoiser state */
99 #define SPEEX_PREPROCESS_SET_DENOISE 0
100 /** Get preprocessor denoiser state */
101 #define SPEEX_PREPROCESS_GET_DENOISE 1
102 
103 /** Set preprocessor Automatic Gain Control state */
104 #define SPEEX_PREPROCESS_SET_AGC 2
105 /** Get preprocessor Automatic Gain Control state */
106 #define SPEEX_PREPROCESS_GET_AGC 3
107 
108 /** Set preprocessor Voice Activity Detection state */
109 #define SPEEX_PREPROCESS_SET_VAD 4
110 /** Get preprocessor Voice Activity Detection state */
111 #define SPEEX_PREPROCESS_GET_VAD 5
112 
113 /** Set preprocessor Automatic Gain Control level (float) */
114 #define SPEEX_PREPROCESS_SET_AGC_LEVEL 6
115 /** Get preprocessor Automatic Gain Control level (float) */
116 #define SPEEX_PREPROCESS_GET_AGC_LEVEL 7
117 
118 /** Set preprocessor dereverb state */
119 #define SPEEX_PREPROCESS_SET_DEREVERB 8
120 /** Get preprocessor dereverb state */
121 #define SPEEX_PREPROCESS_GET_DEREVERB 9
122 
123 /** Set preprocessor dereverb level */
124 #define SPEEX_PREPROCESS_SET_DEREVERB_LEVEL 10
125 /** Get preprocessor dereverb level */
126 #define SPEEX_PREPROCESS_GET_DEREVERB_LEVEL 11
127 
128 /** Set preprocessor dereverb decay */
129 #define SPEEX_PREPROCESS_SET_DEREVERB_DECAY 12
130 /** Get preprocessor dereverb decay */
131 #define SPEEX_PREPROCESS_GET_DEREVERB_DECAY 13
132 
133 /** Set probability required for the VAD to go from silence to voice */
134 #define SPEEX_PREPROCESS_SET_PROB_START 14
135 /** Get probability required for the VAD to go from silence to voice */
136 #define SPEEX_PREPROCESS_GET_PROB_START 15
137 
138 /** Set probability required for the VAD to stay in the voice state (integer percent) */
139 #define SPEEX_PREPROCESS_SET_PROB_CONTINUE 16
140 /** Get probability required for the VAD to stay in the voice state (integer percent) */
141 #define SPEEX_PREPROCESS_GET_PROB_CONTINUE 17
142 
143 /** Set maximum attenuation of the noise in dB (negative number) */
144 #define SPEEX_PREPROCESS_SET_NOISE_SUPPRESS 18
145 /** Get maximum attenuation of the noise in dB (negative number) */
146 #define SPEEX_PREPROCESS_GET_NOISE_SUPPRESS 19
147 
148 /** Set maximum attenuation of the residual echo in dB (negative number) */
149 #define SPEEX_PREPROCESS_SET_ECHO_SUPPRESS 20
150 /** Get maximum attenuation of the residual echo in dB (negative number) */
151 #define SPEEX_PREPROCESS_GET_ECHO_SUPPRESS 21
152 
153 /** Set maximum attenuation of the residual echo in dB when near end is active (negative number) */
154 #define SPEEX_PREPROCESS_SET_ECHO_SUPPRESS_ACTIVE 22
155 /** Get maximum attenuation of the residual echo in dB when near end is active (negative number) */
156 #define SPEEX_PREPROCESS_GET_ECHO_SUPPRESS_ACTIVE 23
157 
158 /** Set the corresponding echo canceller state so that residual echo suppression can be performed (NULL for no residual echo suppression) */
159 #define SPEEX_PREPROCESS_SET_ECHO_STATE 24
160 /** Get the corresponding echo canceller state */
161 #define SPEEX_PREPROCESS_GET_ECHO_STATE 25
162 
163 /** Set maximal gain increase in dB/second (int32) */
164 #define SPEEX_PREPROCESS_SET_AGC_INCREMENT 26
165 
166 /** Get maximal gain increase in dB/second (int32) */
167 #define SPEEX_PREPROCESS_GET_AGC_INCREMENT 27
168 
169 /** Set maximal gain decrease in dB/second (int32) */
170 #define SPEEX_PREPROCESS_SET_AGC_DECREMENT 28
171 
172 /** Get maximal gain decrease in dB/second (int32) */
173 #define SPEEX_PREPROCESS_GET_AGC_DECREMENT 29
174 
175 /** Set maximal gain in dB (int32) */
176 #define SPEEX_PREPROCESS_SET_AGC_MAX_GAIN 30
177 
178 /** Get maximal gain in dB (int32) */
179 #define SPEEX_PREPROCESS_GET_AGC_MAX_GAIN 31
180 
181 /*  Can't set loudness */
182 /** Get loudness */
183 #define SPEEX_PREPROCESS_GET_AGC_LOUDNESS 33
184 
185 /*  Can't set gain */
186 /** Get current gain (int32 percent) */
187 #define SPEEX_PREPROCESS_GET_AGC_GAIN 35
188 
189 /*  Can't set spectrum size */
190 /** Get spectrum size for power spectrum (int32) */
191 #define SPEEX_PREPROCESS_GET_PSD_SIZE 37
192 
193 /*  Can't set power spectrum */
194 /** Get power spectrum (int32[] of squared values) */
195 #define SPEEX_PREPROCESS_GET_PSD 39
196 
197 /*  Can't set noise size */
198 /** Get spectrum size for noise estimate (int32)  */
199 #define SPEEX_PREPROCESS_GET_NOISE_PSD_SIZE 41
200 
201 /*  Can't set noise estimate */
202 /** Get noise estimate (int32[] of squared values) */
203 #define SPEEX_PREPROCESS_GET_NOISE_PSD 43
204 
205 /* Can't set speech probability */
206 /** Get speech probability in last frame (int32).  */
207 #define SPEEX_PREPROCESS_GET_PROB 45
208 
209 /** Set preprocessor Automatic Gain Control level (int32) */
210 #define SPEEX_PREPROCESS_SET_AGC_TARGET 46
211 /** Get preprocessor Automatic Gain Control level (int32) */
212 #define SPEEX_PREPROCESS_GET_AGC_TARGET 47
213 
214 #ifdef __cplusplus
215 }
216 #endif
217 
218 /** @}*/
219 #endif
220