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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/types.h>
#include <pjmedia/errno.h>
#include <pjmedia/silencedet.h>
#include <pj/assert.h>
#include <pj/lock.h>
#include <pj/log.h>
#include <pj/os.h>
#include <pj/pool.h>
#define THIS_FILE "echo_suppress.c"
/*
* Simple echo suppresor
*/
typedef struct echo_supp
{
pj_bool_t suppressing;
pjmedia_silence_det *sd;
pj_time_val last_signal;
unsigned samples_per_frame;
unsigned tail_ms;
} echo_supp;
/*
* Prototypes.
*/
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 );
/*
* Create.
*/
PJ_DEF(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 )
{
echo_supp *ec;
pj_status_t status;
PJ_UNUSED_ARG(clock_rate);
PJ_UNUSED_ARG(options);
PJ_UNUSED_ARG(latency_ms);
ec = pj_pool_zalloc(pool, sizeof(struct echo_supp));
ec->samples_per_frame = samples_per_frame;
ec->tail_ms = tail_ms;
status = pjmedia_silence_det_create(pool, clock_rate, samples_per_frame,
&ec->sd);
if (status != PJ_SUCCESS)
return status;
pjmedia_silence_det_set_name(ec->sd, "ecsu%p");
pjmedia_silence_det_set_adaptive(ec->sd, PJMEDIA_ECHO_SUPPRESS_THRESHOLD);
pjmedia_silence_det_set_params(ec->sd, 100, 500, 3000);
*p_state = ec;
return PJ_SUCCESS;
}
/*
* Destroy.
*/
PJ_DEF(pj_status_t) echo_supp_destroy(void *state)
{
PJ_UNUSED_ARG(state);
return PJ_SUCCESS;
}
/*
* Let the AEC knows that a frame has been played to the speaker.
*/
PJ_DEF(pj_status_t) echo_supp_playback( void *state,
pj_int16_t *play_frm )
{
echo_supp *ec = state;
pj_bool_t silence;
pj_bool_t last_suppressing = ec->suppressing;
silence = pjmedia_silence_det_detect(ec->sd, play_frm,
ec->samples_per_frame, NULL);
ec->suppressing = !silence;
if (ec->suppressing) {
pj_gettimeofday(&ec->last_signal);
}
if (ec->suppressing!=0 && last_suppressing==0) {
PJ_LOG(5,(THIS_FILE, "Start suppressing.."));
} else if (ec->suppressing==0 && last_suppressing!=0) {
PJ_LOG(5,(THIS_FILE, "Stop suppressing.."));
}
return PJ_SUCCESS;
}
/*
* Let the AEC knows that a frame has been captured from the microphone.
*/
PJ_DEF(pj_status_t) echo_supp_capture( void *state,
pj_int16_t *rec_frm,
unsigned options )
{
echo_supp *ec = state;
pj_time_val now;
unsigned delay_ms;
PJ_UNUSED_ARG(options);
pj_gettimeofday(&now);
PJ_TIME_VAL_SUB(now, ec->last_signal);
delay_ms = PJ_TIME_VAL_MSEC(now);
if (delay_ms < ec->tail_ms) {
#if defined(PJMEDIA_ECHO_SUPPRESS_FACTOR) && PJMEDIA_ECHO_SUPPRESS_FACTOR!=0
unsigned i;
for (i=0; i<ec->samples_per_frame; ++i) {
rec_frm[i] = (pj_int16_t)(rec_frm[i] >>
PJMEDIA_ECHO_SUPPRESS_FACTOR);
}
#else
pjmedia_zero_samples(rec_frm, ec->samples_per_frame);
#endif
}
return PJ_SUCCESS;
}
/*
* Perform echo cancellation.
*/
PJ_DEF(pj_status_t) echo_supp_cancel_echo( void *state,
pj_int16_t *rec_frm,
const pj_int16_t *play_frm,
unsigned options,
void *reserved )
{
echo_supp *ec = state;
pj_bool_t silence;
PJ_UNUSED_ARG(options);
PJ_UNUSED_ARG(reserved);
silence = pjmedia_silence_det_detect(ec->sd, play_frm,
ec->samples_per_frame, NULL);
if (!silence) {
#if defined(PJMEDIA_ECHO_SUPPRESS_FACTOR) && PJMEDIA_ECHO_SUPPRESS_FACTOR!=0
unsigned i;
for (i=0; i<ec->samples_per_frame; ++i) {
rec_frm[i] = (pj_int16_t)(rec_frm[i] >>
PJMEDIA_ECHO_SUPPRESS_FACTOR);
}
#else
pjmedia_zero_samples(rec_frm, ec->samples_per_frame);
#endif
}
return PJ_SUCCESS;
}
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