1 /* Copyright (C) 2003 Epic Games 2 Written by Jean-Marc Valin 3 4 File: speex_preprocess.h 5 6 7 Redistribution and use in source and binary forms, with or without 8 modification, are permitted provided that the following conditions are 9 met: 10 11 1. Redistributions of source code must retain the above copyright notice, 12 this list of conditions and the following disclaimer. 13 14 2. Redistributions in binary form must reproduce the above copyright 15 notice, this list of conditions and the following disclaimer in the 16 documentation and/or other materials provided with the distribution. 17 18 3. The name of the author may not be used to endorse or promote products 19 derived from this software without specific prior written permission. 20 21 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 24 DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 25 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 26 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 27 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 29 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 30 ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #ifndef SPEEX_PREPROCESS_H 35 #define SPEEX_PREPROCESS_H 36 37 #include "speex/speex_types.h" 38 39 #ifdef __cplusplus 40 extern "C" { 41 #endif 42 43 struct drft_lookup; 44 45 typedef struct SpeexPreprocessState { 46 int frame_size; /**< Number of samples processed each time */ 47 int ps_size; /**< Number of points in the power spectrum */ 48 int sampling_rate; /**< Sampling rate of the input/output */ 49 50 /* parameters */ 51 int denoise_enabled; 52 int agc_enabled; 53 float agc_level; 54 int vad_enabled; 55 int dereverb_enabled; 56 float reverb_decay; 57 float reverb_level; 58 float speech_prob_start; 59 float speech_prob_continue; 60 61 float *frame; /**< Processing frame (2*ps_size) */ 62 float *ps; /**< Current power spectrum */ 63 float *gain2; /**< Adjusted gains */ 64 float *window; /**< Analysis/Synthesis window */ 65 float *noise; /**< Noise estimate */ 66 float *reverb_estimate; /**< Estimate of reverb energy */ 67 float *old_ps; /**< Power spectrum for last frame */ 68 float *gain; /**< Ephraim Malah gain */ 69 float *prior; /**< A-priori SNR */ 70 float *post; /**< A-posteriori SNR */ 71 72 float *S; /**< Smoothed power spectrum */ 73 float *Smin; /**< See Cohen paper */ 74 float *Stmp; /**< See Cohen paper */ 75 float *update_prob; /**< Propability of speech presence for noise update */ 76 77 float *zeta; /**< Smoothed a priori SNR */ 78 float Zpeak; 79 float Zlast; 80 81 float *loudness_weight; /**< Perceptual loudness curve */ 82 83 float *echo_noise; 84 85 float *noise_bands; 86 float *noise_bands2; 87 int noise_bandsN; 88 float *speech_bands; 89 float *speech_bands2; 90 int speech_bandsN; 91 92 float *inbuf; /**< Input buffer (overlapped analysis) */ 93 float *outbuf; /**< Output buffer (for overlap and add) */ 94 95 float speech_prob; 96 int last_speech; 97 float loudness; /**< loudness estimate */ 98 float loudness2; /**< loudness estimate */ 99 int nb_adapt; /**< Number of frames used for adaptation so far */ 100 int nb_loudness_adapt; /**< Number of frames used for loudness adaptation so far */ 101 int consec_noise; /**< Number of consecutive noise frames */ 102 int nb_preprocess; /**< Number of frames processed so far */ 103 struct drft_lookup *fft_lookup; /**< Lookup table for the FFT */ 104 105 } SpeexPreprocessState; 106 107 /** Creates a new preprocessing state */ 108 SpeexPreprocessState *speex_preprocess_state_init(int frame_size, int sampling_rate); 109 110 /** Destroys a denoising state */ 111 void speex_preprocess_state_destroy(SpeexPreprocessState *st); 112 113 /** Preprocess a frame */ 114 int speex_preprocess(SpeexPreprocessState *st, spx_int16_t *x, float *echo); 115 116 /** Preprocess a frame */ 117 void speex_preprocess_estimate_update(SpeexPreprocessState *st, spx_int16_t *x, float *echo); 118 119 /** Used like the ioctl function to control the preprocessor parameters */ 120 int speex_preprocess_ctl(SpeexPreprocessState *st, int request, void *ptr); 121 122 123 124 #define SPEEX_PREPROCESS_SET_DENOISE 0 125 #define SPEEX_PREPROCESS_GET_DENOISE 1 126 127 #define SPEEX_PREPROCESS_SET_AGC 2 128 #define SPEEX_PREPROCESS_GET_AGC 3 129 130 #define SPEEX_PREPROCESS_SET_VAD 4 131 #define SPEEX_PREPROCESS_GET_VAD 5 132 133 #define SPEEX_PREPROCESS_SET_AGC_LEVEL 6 134 #define SPEEX_PREPROCESS_GET_AGC_LEVEL 7 135 136 #define SPEEX_PREPROCESS_SET_DEREVERB 8 137 #define SPEEX_PREPROCESS_GET_DEREVERB 9 138 139 #define SPEEX_PREPROCESS_SET_DEREVERB_LEVEL 10 140 #define SPEEX_PREPROCESS_GET_DEREVERB_LEVEL 11 141 142 #define SPEEX_PREPROCESS_SET_DEREVERB_DECAY 12 143 #define SPEEX_PREPROCESS_GET_DEREVERB_DECAY 13 144 145 #define SPEEX_PREPROCESS_SET_PROB_START 14 146 #define SPEEX_PREPROCESS_GET_PROB_START 15 147 148 #define SPEEX_PREPROCESS_SET_PROB_CONTINUE 16 149 #define SPEEX_PREPROCESS_GET_PROB_CONTINUE 17 150 151 152 #ifdef __cplusplus 153 } 154 #endif 155 156 #endif 157