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/* $Id$ */
/*
* Copyright (C) 2003-2006 Benny Prijono <benny@prijono.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <pjmedia/echo.h>
#include <pj/assert.h>
#include <pj/pool.h>
typedef struct ec_operations ec_operations;
struct pjmedia_echo_state
{
void *state;
ec_operations *op;
};
struct ec_operations
{
pj_status_t (*ec_create)(pj_pool_t *pool,
unsigned clock_rate,
unsigned samples_per_frame,
unsigned tail_ms,
unsigned latency_ms,
unsigned options,
void **p_state );
pj_status_t (*ec_destroy)(void *state );
pj_status_t (*ec_playback)(void *state,
pj_int16_t *play_frm );
pj_status_t (*ec_capture)(void *state,
pj_int16_t *rec_frm,
unsigned options );
pj_status_t (*ec_cancel)(void *state,
pj_int16_t *rec_frm,
const pj_int16_t *play_frm,
unsigned options,
void *reserved );
};
/*
* Simple echo suppressor
*/
PJ_DECL(pj_status_t) echo_supp_create(pj_pool_t *pool,
unsigned clock_rate,
unsigned samples_per_frame,
unsigned tail_ms,
unsigned latency_ms,
unsigned options,
void **p_state );
PJ_DECL(pj_status_t) echo_supp_destroy(void *state);
PJ_DECL(pj_status_t) echo_supp_playback(void *state,
pj_int16_t *play_frm );
PJ_DECL(pj_status_t) echo_supp_capture(void *state,
pj_int16_t *rec_frm,
unsigned options );
PJ_DECL(pj_status_t) echo_supp_cancel_echo(void *state,
pj_int16_t *rec_frm,
const pj_int16_t *play_frm,
unsigned options,
void *reserved );
static struct ec_operations echo_supp_op =
{
&echo_supp_create,
&echo_supp_destroy,
&echo_supp_playback,
&echo_supp_capture,
&echo_supp_cancel_echo
};
/*
* Speex AEC prototypes
*/
#if defined(PJMEDIA_HAS_SPEEX_AEC) && PJMEDIA_HAS_SPEEX_AEC!=0
PJ_DECL(pj_status_t) speex_aec_create(pj_pool_t *pool,
unsigned clock_rate,
unsigned samples_per_frame,
unsigned tail_ms,
unsigned latency_ms,
unsigned options,
void **p_state );
PJ_DECL(pj_status_t) speex_aec_destroy(void *state );
PJ_DECL(pj_status_t) speex_aec_playback(void *state,
pj_int16_t *play_frm );
PJ_DECL(pj_status_t) speex_aec_capture(void *state,
pj_int16_t *rec_frm,
unsigned options );
PJ_DECL(pj_status_t) speex_aec_cancel_echo(void *state,
pj_int16_t *rec_frm,
const pj_int16_t *play_frm,
unsigned options,
void *reserved );
static struct ec_operations aec_op =
{
&speex_aec_create,
&speex_aec_destroy,
&speex_aec_playback,
&speex_aec_capture,
&speex_aec_cancel_echo
};
#else
#define aec_op echo_supp_op
#endif
/*
* Create the echo canceller.
*/
PJ_DEF(pj_status_t) pjmedia_echo_create( pj_pool_t *pool,
unsigned clock_rate,
unsigned samples_per_frame,
unsigned tail_ms,
unsigned latency_ms,
unsigned options,
pjmedia_echo_state **p_echo )
{
pjmedia_echo_state *ec;
pj_status_t status;
/* Force to use simple echo suppressor if AEC is not available */
#if !defined(PJMEDIA_HAS_SPEEX_AEC) || PJMEDIA_HAS_SPEEX_AEC==0
options |= PJMEDIA_ECHO_SIMPLE;
#endif
ec = pj_pool_zalloc(pool, sizeof(struct pjmedia_echo_state));
if (options & PJMEDIA_ECHO_SIMPLE) {
ec->op = &echo_supp_op;
status = (*echo_supp_op.ec_create)(pool, clock_rate, samples_per_frame,
tail_ms, latency_ms, options,
&ec->state);
} else {
ec->op = &aec_op;
status = (*aec_op.ec_create)(pool, clock_rate,
samples_per_frame,
tail_ms, latency_ms, options,
&ec->state);
}
if (status != PJ_SUCCESS)
return status;
pj_assert(ec->state != NULL);
*p_echo = ec;
return PJ_SUCCESS;
}
/*
* Destroy the Echo Canceller.
*/
PJ_DEF(pj_status_t) pjmedia_echo_destroy(pjmedia_echo_state *echo )
{
return (*echo->op->ec_destroy)(echo->state);
}
/*
* Let the Echo Canceller knows that a frame has been played to the speaker.
*/
PJ_DEF(pj_status_t) pjmedia_echo_playback( pjmedia_echo_state *echo,
pj_int16_t *play_frm )
{
return (*echo->op->ec_playback)(echo->state, play_frm);
}
/*
* Let the Echo Canceller knows that a frame has been captured from
* the microphone.
*/
PJ_DEF(pj_status_t) pjmedia_echo_capture( pjmedia_echo_state *echo,
pj_int16_t *rec_frm,
unsigned options )
{
return (*echo->op->ec_capture)(echo->state, rec_frm, options);
}
/*
* Perform echo cancellation.
*/
PJ_DEF(pj_status_t) pjmedia_echo_cancel( pjmedia_echo_state *echo,
pj_int16_t *rec_frm,
const pj_int16_t *play_frm,
unsigned options,
void *reserved )
{
return (*echo->op->ec_cancel)( echo->state, rec_frm, play_frm, options,
reserved);
}
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