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190 lines
7.5 KiB
C
190 lines
7.5 KiB
C
/* Copyright (C) 2003 Epic Games
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Written by Jean-Marc Valin */
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/**
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* @file speex_preprocess.h
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* @brief Speex preprocessor. The preprocess can do noise suppression,
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* residual echo suppression (after using the echo canceller), automatic
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* gain control (AGC) and voice activity detection (VAD).
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*/
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/*
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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_PREPROCESS_H
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#define SPEEX_PREPROCESS_H
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/** @defgroup SpeexPreprocessState SpeexPreprocessState: The Speex preprocessor
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* This is the Speex preprocessor. The preprocess can do noise suppression,
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* residual echo suppression (after using the echo canceller), automatic
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* gain control (AGC) and voice activity detection (VAD).
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* @{
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*/
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#include "speex/speex_types.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** State of the preprocessor (one per channel). Should never be accessed directly. */
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struct SpeexPreprocessState_;
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/** State of the preprocessor (one per channel). Should never be accessed directly. */
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typedef struct SpeexPreprocessState_ SpeexPreprocessState;
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/** Creates a new preprocessing state. You MUST create one state per channel processed.
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* @param frame_size Number of samples to process at one time (should correspond to 10-20 ms). Must be
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* the same value as that used for the echo canceller for residual echo cancellation to work.
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* @param sampling_rate Sampling rate used for the input.
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* @return Newly created preprocessor state
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*/
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SpeexPreprocessState *speex_preprocess_state_init(int frame_size, int sampling_rate);
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/** Destroys a preprocessor state
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* @param st Preprocessor state to destroy
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*/
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void speex_preprocess_state_destroy(SpeexPreprocessState *st);
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/** Preprocess a frame
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* @param st Preprocessor state
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* @param x Audio sample vector (in and out). Must be same size as specified in speex_preprocess_state_init().
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* @return Bool value for voice activity (1 for speech, 0 for noise/silence), ONLY if VAD turned on.
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*/
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int speex_preprocess_run(SpeexPreprocessState *st, spx_int16_t *x);
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/** Preprocess a frame (deprecated, use speex_preprocess_run() instead)*/
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int speex_preprocess(SpeexPreprocessState *st, spx_int16_t *x, spx_int32_t *echo);
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/** Update preprocessor state, but do not compute the output
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* @param st Preprocessor state
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* @param x Audio sample vector (in only). Must be same size as specified in speex_preprocess_state_init().
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*/
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void speex_preprocess_estimate_update(SpeexPreprocessState *st, spx_int16_t *x);
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/** Used like the ioctl function to control the preprocessor parameters
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* @param st Preprocessor state
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* @param request ioctl-type request (one of the SPEEX_PREPROCESS_* macros)
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* @param ptr Data exchanged to-from function
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* @return 0 if no error, -1 if request in unknown
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*/
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int speex_preprocess_ctl(SpeexPreprocessState *st, int request, void *ptr);
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/** Set preprocessor denoiser state */
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#define SPEEX_PREPROCESS_SET_DENOISE 0
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/** Get preprocessor denoiser state */
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#define SPEEX_PREPROCESS_GET_DENOISE 1
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/** Set preprocessor Automatic Gain Control state */
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#define SPEEX_PREPROCESS_SET_AGC 2
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/** Get preprocessor Automatic Gain Control state */
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#define SPEEX_PREPROCESS_GET_AGC 3
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/** Set preprocessor Voice Activity Detection state */
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#define SPEEX_PREPROCESS_SET_VAD 4
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/** Get preprocessor Voice Activity Detection state */
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#define SPEEX_PREPROCESS_GET_VAD 5
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/** Set preprocessor Automatic Gain Control level */
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#define SPEEX_PREPROCESS_SET_AGC_LEVEL 6
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/** Get preprocessor Automatic Gain Control level */
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#define SPEEX_PREPROCESS_GET_AGC_LEVEL 7
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/** Set preprocessor dereverb state */
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#define SPEEX_PREPROCESS_SET_DEREVERB 8
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/** Get preprocessor dereverb state */
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#define SPEEX_PREPROCESS_GET_DEREVERB 9
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/** Set preprocessor dereverb level */
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#define SPEEX_PREPROCESS_SET_DEREVERB_LEVEL 10
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/** Get preprocessor dereverb level */
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#define SPEEX_PREPROCESS_GET_DEREVERB_LEVEL 11
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/** Set preprocessor dereverb decay */
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#define SPEEX_PREPROCESS_SET_DEREVERB_DECAY 12
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/** Get preprocessor dereverb decay */
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#define SPEEX_PREPROCESS_GET_DEREVERB_DECAY 13
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/** Set probability required for the VAD to go from silence to voice */
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#define SPEEX_PREPROCESS_SET_PROB_START 14
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/** Get probability required for the VAD to go from silence to voice */
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#define SPEEX_PREPROCESS_GET_PROB_START 15
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/** Set probability required for the VAD to stay in the voice state (integer percent) */
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#define SPEEX_PREPROCESS_SET_PROB_CONTINUE 16
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/** Get probability required for the VAD to stay in the voice state (integer percent) */
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#define SPEEX_PREPROCESS_GET_PROB_CONTINUE 17
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/** Set maximum attenuation of the noise in dB (negative number) */
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#define SPEEX_PREPROCESS_SET_NOISE_SUPPRESS 18
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/** Get maximum attenuation of the noise in dB (negative number) */
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#define SPEEX_PREPROCESS_GET_NOISE_SUPPRESS 19
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/** Set maximum attenuation of the residual echo in dB (negative number) */
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#define SPEEX_PREPROCESS_SET_ECHO_SUPPRESS 20
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/** Get maximum attenuation of the residual echo in dB (negative number) */
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#define SPEEX_PREPROCESS_GET_ECHO_SUPPRESS 21
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/** Set maximum attenuation of the residual echo in dB when near end is active (negative number) */
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#define SPEEX_PREPROCESS_SET_ECHO_SUPPRESS_ACTIVE 22
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/** Get maximum attenuation of the residual echo in dB when near end is active (negative number) */
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#define SPEEX_PREPROCESS_GET_ECHO_SUPPRESS_ACTIVE 23
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/** Set the corresponding echo canceller state so that residual echo suppression can be performed (NULL for no residual echo suppression) */
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#define SPEEX_PREPROCESS_SET_ECHO_STATE 24
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/** Get the corresponding echo canceller state */
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#define SPEEX_PREPROCESS_GET_ECHO_STATE 25
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/** Set maximal gain increase in dB/second (int32) */
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#define SPEEX_PREPROCESS_SET_AGC_INCREMENT 26
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/** Get maximal gain increase in dB/second (int32) */
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#define SPEEX_PREPROCESS_GET_AGC_INCREMENT 27
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/** Set maximal gain decrease in dB/second (int32) */
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#define SPEEX_PREPROCESS_SET_AGC_DECREMENT 28
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/** Get maximal gain decrease in dB/second (int32) */
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#define SPEEX_PREPROCESS_GET_AGC_DECREMENT 29
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/** Set maximal gain in dB (int32) */
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#define SPEEX_PREPROCESS_SET_AGC_MAX_GAIN 30
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/** Get maximal gain in dB (int32) */
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#define SPEEX_PREPROCESS_GET_AGC_MAX_GAIN 31
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/* Can't set loudness */
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/** Get loudness */
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#define SPEEX_PREPROCESS_GET_AGC_LOUDNESS 33
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#ifdef __cplusplus
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}
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#endif
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/** @}*/
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#endif
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