99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
/* Copyright (C) Jean-Marc Valin
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File: speex_echo.h
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SPEEX_ECHO_H
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#define SPEEX_ECHO_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct drft_lookup;
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typedef struct SpeexEchoState {
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int frame_size; /**< Number of samples processed each time */
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int window_size;
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int M;
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int cancel_count;
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int adapted;
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float adapt_rate;
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float sum_adapt;
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float Sey;
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float Syy;
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float See;
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float *x;
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float *X;
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float *d;
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float *D;
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float *y;
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float *y2;
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float *last_y;
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float *Yps;
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float *Y;
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float *Y2;
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float *E;
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float *PHI;
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float * W;
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float *power;
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float *power_1;
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float *grad;
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float *Rf;
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float *Yf;
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float *Xf;
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float *fratio;
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float *regul;
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struct drft_lookup *fft_lookup;
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} SpeexEchoState;
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/** Creates a new echo canceller state */
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SpeexEchoState *speex_echo_state_init(int frame_size, int filter_length);
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/** Destroys an echo canceller state */
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void speex_echo_state_destroy(SpeexEchoState *st);
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/** Performs echo cancellation a frame */
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void speex_echo_cancel(SpeexEchoState *st, short *ref, short *echo, short *out, float *Y);
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/** Reset the echo canceller state */
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void speex_echo_state_reset(SpeexEchoState *st);
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#ifdef __cplusplus
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}
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#endif
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#endif
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