mirror of
https://github.com/ioquake/ioq3.git
synced 2024-11-10 15:21:35 +00:00
123 lines
4.5 KiB
C
123 lines
4.5 KiB
C
/* Copyright (C) Jean-Marc Valin */
|
|
/**
|
|
@file speex_echo.h
|
|
@brief Echo cancellation
|
|
*/
|
|
/*
|
|
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_ECHO_H
|
|
#define SPEEX_ECHO_H
|
|
/** @defgroup SpeexEchoState SpeexEchoState: Acoustic echo canceller
|
|
* This is the acoustic echo canceller module.
|
|
* @{
|
|
*/
|
|
#include "speex/speex_types.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/** Obtain frame size used by the AEC */
|
|
#define SPEEX_ECHO_GET_FRAME_SIZE 3
|
|
|
|
/** Set sampling rate */
|
|
#define SPEEX_ECHO_SET_SAMPLING_RATE 24
|
|
/** Get sampling rate */
|
|
#define SPEEX_ECHO_GET_SAMPLING_RATE 25
|
|
|
|
/** Internal echo canceller state. Should never be accessed directly. */
|
|
struct SpeexEchoState_;
|
|
|
|
/** @class SpeexEchoState
|
|
* This holds the state of the echo canceller. You need one per channel.
|
|
*/
|
|
|
|
/** Internal echo canceller state. Should never be accessed directly. */
|
|
typedef struct SpeexEchoState_ SpeexEchoState;
|
|
|
|
/** Creates a new echo canceller state
|
|
* @param frame_size Number of samples to process at one time (should correspond to 10-20 ms)
|
|
* @param filter_length Number of samples of echo to cancel (should generally correspond to 100-500 ms)
|
|
* @return Newly-created echo canceller state
|
|
*/
|
|
SpeexEchoState *speex_echo_state_init(int frame_size, int filter_length);
|
|
|
|
/** Destroys an echo canceller state
|
|
* @param st Echo canceller state
|
|
*/
|
|
void speex_echo_state_destroy(SpeexEchoState *st);
|
|
|
|
/** Performs echo cancellation a frame, based on the audio sent to the speaker (no delay is added
|
|
* to playback in this form)
|
|
*
|
|
* @param st Echo canceller state
|
|
* @param rec Signal from the microphone (near end + far end echo)
|
|
* @param play Signal played to the speaker (received from far end)
|
|
* @param out Returns near-end signal with echo removed
|
|
*/
|
|
void speex_echo_cancellation(SpeexEchoState *st, const spx_int16_t *rec, const spx_int16_t *play, spx_int16_t *out);
|
|
|
|
/** Performs echo cancellation a frame (deprecated) */
|
|
void speex_echo_cancel(SpeexEchoState *st, const spx_int16_t *rec, const spx_int16_t *play, spx_int16_t *out, spx_int32_t *Yout);
|
|
|
|
/** Perform echo cancellation using internal playback buffer, which is delayed by two frames
|
|
* to account for the delay introduced by most soundcards (but it could be off!)
|
|
* @param st Echo canceller state
|
|
* @param rec Signal from the microphone (near end + far end echo)
|
|
* @param out Returns near-end signal with echo removed
|
|
*/
|
|
void speex_echo_capture(SpeexEchoState *st, const spx_int16_t *rec, spx_int16_t *out);
|
|
|
|
/** Let the echo canceller know that a frame was just queued to the soundcard
|
|
* @param st Echo canceller state
|
|
* @param play Signal played to the speaker (received from far end)
|
|
*/
|
|
void speex_echo_playback(SpeexEchoState *st, const spx_int16_t *play);
|
|
|
|
/** Reset the echo canceller to its original state
|
|
* @param st Echo canceller state
|
|
*/
|
|
void speex_echo_state_reset(SpeexEchoState *st);
|
|
|
|
/** Used like the ioctl function to control the echo canceller parameters
|
|
*
|
|
* @param st Echo canceller state
|
|
* @param request ioctl-type request (one of the SPEEX_ECHO_* macros)
|
|
* @param ptr Data exchanged to-from function
|
|
* @return 0 if no error, -1 if request in unknown
|
|
*/
|
|
int speex_echo_ctl(SpeexEchoState *st, int request, void *ptr);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
|
|
/** @}*/
|
|
#endif
|