speex_preprocess.h
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上传日期:2014-04-03
资源大小:7248k
文件大小:5k
源码类别:
Windows CE
开发平台:
C/C++
- /* Copyright (C) 2003 Epic Games
- Written by Jean-Marc Valin
- File: speex_preprocess.h
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions are
- met:
- 1. Redistributions of source code must retain the above copyright notice,
- this list of conditions and the following disclaimer.
- 2. Redistributions in binary form must reproduce the above copyright
- notice, this list of conditions and the following disclaimer in the
- documentation and/or other materials provided with the distribution.
- 3. The name of the author may not be used to endorse or promote products
- derived from this software without specific prior written permission.
- THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
- INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- POSSIBILITY OF SUCH DAMAGE.
- */
- #ifndef SPEEX_PREPROCESS_H
- #define SPEEX_PREPROCESS_H
- #include "speex/speex_types.h"
- #ifdef __cplusplus
- extern "C" {
- #endif
- struct drft_lookup;
- typedef struct SpeexPreprocessState {
- int frame_size; /**< Number of samples processed each time */
- int ps_size; /**< Number of points in the power spectrum */
- int sampling_rate; /**< Sampling rate of the input/output */
- /* parameters */
- int denoise_enabled;
- int agc_enabled;
- float agc_level;
- int vad_enabled;
- int dereverb_enabled;
- float reverb_decay;
- float reverb_level;
- float *frame; /**< Processing frame (2*ps_size) */
- float *ps; /**< Current power spectrum */
- float *gain2; /**< Adjusted gains */
- float *window; /**< Analysis/Synthesis window */
- float *noise; /**< Noise estimate */
- float *reverb_estimate; /**< Estimate of reverb energy */
- float *old_ps; /**< Power spectrum for last frame */
- float *gain; /**< Ephraim Malah gain */
- float *prior; /**< A-priori SNR */
- float *post; /**< A-posteriori SNR */
- float *S; /**< Smoothed power spectrum */
- float *Smin; /**< See Cohen paper */
- float *Stmp; /**< See Cohen paper */
- float *update_prob; /**< Propability of speech presence for noise update */
- float *zeta; /**< Smoothed a priori SNR */
- float Zpeak;
- float Zlast;
- float *loudness_weight; /**< Perceptual loudness curve */
- float *echo_noise;
- float *noise_bands;
- float *noise_bands2;
- int noise_bandsN;
- float *speech_bands;
- float *speech_bands2;
- int speech_bandsN;
- float *inbuf; /**< Input buffer (overlapped analysis) */
- float *outbuf; /**< Output buffer (for overlap and add) */
- float speech_prob;
- int last_speech;
- float loudness; /**< loudness estimate */
- float loudness2; /**< loudness estimate */
- int nb_adapt; /**< Number of frames used for adaptation so far */
- int nb_loudness_adapt; /**< Number of frames used for loudness adaptation so far */
- int consec_noise; /**< Number of consecutive noise frames */
- int nb_preprocess; /**< Number of frames processed so far */
- struct drft_lookup *fft_lookup; /**< Lookup table for the FFT */
- } SpeexPreprocessState;
- /** Creates a new preprocessing state */
- SpeexPreprocessState *speex_preprocess_state_init(int frame_size, int sampling_rate);
- /** Destroys a denoising state */
- void speex_preprocess_state_destroy(SpeexPreprocessState *st);
- /** Preprocess a frame */
- int speex_preprocess(SpeexPreprocessState *st, spx_int16_t *x, float *echo);
- /** Preprocess a frame */
- void speex_preprocess_estimate_update(SpeexPreprocessState *st, spx_int16_t *x, float *echo);
- /** Used like the ioctl function to control the preprocessor parameters */
- int speex_preprocess_ctl(SpeexPreprocessState *st, int request, void *ptr);
- #define SPEEX_PREPROCESS_SET_DENOISE 0
- #define SPEEX_PREPROCESS_GET_DENOISE 1
- #define SPEEX_PREPROCESS_SET_AGC 2
- #define SPEEX_PREPROCESS_GET_AGC 3
- #define SPEEX_PREPROCESS_SET_VAD 4
- #define SPEEX_PREPROCESS_GET_VAD 5
- #define SPEEX_PREPROCESS_SET_AGC_LEVEL 6
- #define SPEEX_PREPROCESS_GET_AGC_LEVEL 7
- #define SPEEX_PREPROCESS_SET_DEREVERB 8
- #define SPEEX_PREPROCESS_GET_DEREVERB 9
- #define SPEEX_PREPROCESS_SET_DEREVERB_LEVEL 10
- #define SPEEX_PREPROCESS_GET_DEREVERB_LEVEL 11
- #define SPEEX_PREPROCESS_SET_DEREVERB_DECAY 12
- #define SPEEX_PREPROCESS_GET_DEREVERB_DECAY 13
- #ifdef __cplusplus
- }
- #endif
- #endif