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/* Copyright (C) 2003 Epic Games
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Written by Jean-Marc Valin
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File: speex_preprocess.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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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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typedef struct SpeexPreprocessState {
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int frame_size; /**< Number of samples processed each time */
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int ps_size; /**< Number of points in the power spectrum */
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int sampling_rate; /**< Sampling rate of the input/output */
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float *frame; /**< Processing frame (2*ps_size) */
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float *ps; /**< Current power spectrum */
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float *gain2; /**< Adjusted gains */
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float *window; /**< Analysis/Synthesis window */
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float *noise; /**< Noise estimate */
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float *old_ps; /**< Power spectrum for last frame */
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float *gain; /**< Ephraim Malah gain */
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float *prior; /**< A-priori SNR */
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float *post; /**< A-posteriori SNR */
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float *S; /**< Smoothed power spectrum */
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float *Smin; /**< See Cohen paper */
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float *Stmp; /**< See Cohen paper */
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float *update_prob; /**< Propability of speech presence for noise update */
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float *zeta; /**< Smoothed a priori SNR */
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float *loudness_weight; /**< Perceptual loudness curve */
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float *inbuf; /**< Input buffer (overlapped analysis) */
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float *outbuf; /**< Output buffer (for overlap and add) */
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float loudness; /**< loudness estimate */
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float loudness2; /**< loudness estimate */
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int nb_adapt; /**< Number of frames used for adaptation so far */
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int nb_loudness_adapt; /**< Number of frames used for loudness adaptation so far */
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int consec_noise; /**< Number of consecutive noise frames */
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int nb_preprocess; /**< Number of frames processed so far */
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struct drft_lookup *fft_lookup; /**< Lookup table for the FFT */
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} SpeexPreprocessState;
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/** Creates a new preprocessing state */
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SpeexPreprocessState *speex_preprocess_state_init(int frame_size, int sampling_rate);
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/** Destroys a denoising state */
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void speex_preprocess_state_destroy(SpeexPreprocessState *st);
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/** Preprocess a frame */
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int speex_preprocess(SpeexPreprocessState *st, short *x, float *noise);
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/** Preprocess a frame */
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void speex_preprocess_estimate_update(SpeexPreprocessState *st, short *x, float *noise);
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/** Used like the ioctl function to control the preprocessor parameters */
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int speex_preprocess_ctl(SpeexPreprocessState *st, int request, void *ptr);
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#define SPEEX_PREPROCESS_SET_DENOISE 0
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#define SPEEX_PREPROCESS_GET_DENOISE 1
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#define SPEEX_PREPROCESS_SET_AGC 2
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#define SPEEX_PREPROCESS_GET_AGC 3
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#define SPEEX_PREPROCESS_SET_VAD 4
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#define SPEEX_PREPROCESS_GET_VAD 5
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#define SPEEX_PREPROCESS_SET_AGC_LEVEL 6
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#define SPEEX_PREPROCESS_GET_AGC_LEVEL 7
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removed
speex/libspeex/speex_preprocess.h
