1 /* Copyright (C) Jean-Marc Valin 2 3 File: speex_echo.h 4 5 6 Redistribution and use in source and binary forms, with or without 7 modification, are permitted provided that the following conditions are 8 met: 9 10 1. Redistributions of source code must retain the above copyright notice, 11 this list of conditions and the following disclaimer. 12 13 2. Redistributions in binary form must reproduce the above copyright 14 notice, this list of conditions and the following disclaimer in the 15 documentation and/or other materials provided with the distribution. 16 17 3. The name of the author may not be used to endorse or promote products 18 derived from this software without specific prior written permission. 19 20 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 23 DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 24 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 25 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 26 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 28 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 29 ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #ifndef SPEEX_ECHO_H 34 #define SPEEX_ECHO_H 35 36 #ifdef __cplusplus 37 extern "C" { 38 #endif 39 40 struct drft_lookup; 41 42 typedef struct SpeexEchoState { 43 int frame_size; /**< Number of samples processed each time */ 44 int window_size; 45 int M; 46 int cancel_count; 47 int adapted; 48 float adapt_rate; 49 float sum_adapt; 50 float Sey; 51 float Syy; 52 float See; 53 54 float *x; 55 float *X; 56 float *d; 57 float *D; 58 float *y; 59 float *y2; 60 float *last_y; 61 float *Yps; 62 float *Y; 63 float *Y2; 64 float *E; 65 float *PHI; 66 float * W; 67 float *power; 68 float *power_1; 69 float *grad; 70 float *Rf; 71 float *Yf; 72 float *Xf; 73 float *fratio; 74 float *regul; 75 76 struct drft_lookup *fft_lookup; 77 78 79 } SpeexEchoState; 80 81 82 /** Creates a new echo canceller state */ 83 SpeexEchoState *speex_echo_state_init(int frame_size, int filter_length); 84 85 /** Destroys an echo canceller state */ 86 void speex_echo_state_destroy(SpeexEchoState *st); 87 88 /** Performs echo cancellation a frame */ 89 void speex_echo_cancel(SpeexEchoState *st, short *ref, short *echo, short *out, float *Y); 90 91 /** Reset the echo canceller state */ 92 void speex_echo_state_reset(SpeexEchoState *st); 93 94 #ifdef __cplusplus 95 } 96 #endif 97 98 #endif 99