189 lines
4.5 KiB
C
189 lines
4.5 KiB
C
/* $Id$ */
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/*
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* Copyright (C) 2003-2007 Benny Prijono <benny@prijono.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <pjmedia/types.h>
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#include <pjmedia/errno.h>
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#include <pjmedia/silencedet.h>
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#include <pj/assert.h>
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#include <pj/lock.h>
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#include <pj/log.h>
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#include <pj/os.h>
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#include <pj/pool.h>
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#include "echo_internal.h"
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#define THIS_FILE "echo_suppress.c"
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/*
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* Simple echo suppresor
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*/
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typedef struct echo_supp
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{
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pj_bool_t suppressing;
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pjmedia_silence_det *sd;
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pj_time_val last_signal;
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unsigned samples_per_frame;
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unsigned tail_ms;
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} echo_supp;
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/*
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* Create.
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*/
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PJ_DEF(pj_status_t) echo_supp_create( pj_pool_t *pool,
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unsigned clock_rate,
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unsigned samples_per_frame,
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unsigned tail_ms,
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unsigned latency_ms,
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unsigned options,
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void **p_state )
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{
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echo_supp *ec;
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pj_status_t status;
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PJ_UNUSED_ARG(clock_rate);
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PJ_UNUSED_ARG(options);
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PJ_UNUSED_ARG(latency_ms);
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ec = PJ_POOL_ZALLOC_T(pool, struct echo_supp);
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ec->samples_per_frame = samples_per_frame;
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ec->tail_ms = tail_ms;
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status = pjmedia_silence_det_create(pool, clock_rate, samples_per_frame,
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&ec->sd);
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if (status != PJ_SUCCESS)
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return status;
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pjmedia_silence_det_set_name(ec->sd, "ecsu%p");
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pjmedia_silence_det_set_adaptive(ec->sd, PJMEDIA_ECHO_SUPPRESS_THRESHOLD);
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pjmedia_silence_det_set_params(ec->sd, 100, 500, 3000);
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*p_state = ec;
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return PJ_SUCCESS;
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}
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/*
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* Destroy.
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*/
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PJ_DEF(pj_status_t) echo_supp_destroy(void *state)
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{
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PJ_UNUSED_ARG(state);
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return PJ_SUCCESS;
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}
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/*
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* Let the AEC knows that a frame has been played to the speaker.
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*/
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PJ_DEF(pj_status_t) echo_supp_playback( void *state,
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pj_int16_t *play_frm )
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{
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echo_supp *ec = (echo_supp*) state;
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pj_bool_t silence;
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pj_bool_t last_suppressing = ec->suppressing;
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silence = pjmedia_silence_det_detect(ec->sd, play_frm,
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ec->samples_per_frame, NULL);
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ec->suppressing = !silence;
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if (ec->suppressing) {
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pj_gettimeofday(&ec->last_signal);
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}
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if (ec->suppressing!=0 && last_suppressing==0) {
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PJ_LOG(5,(THIS_FILE, "Start suppressing.."));
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} else if (ec->suppressing==0 && last_suppressing!=0) {
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PJ_LOG(5,(THIS_FILE, "Stop suppressing.."));
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}
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return PJ_SUCCESS;
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}
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/*
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* Let the AEC knows that a frame has been captured from the microphone.
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*/
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PJ_DEF(pj_status_t) echo_supp_capture( void *state,
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pj_int16_t *rec_frm,
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unsigned options )
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{
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echo_supp *ec = (echo_supp*) state;
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pj_time_val now;
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unsigned delay_ms;
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PJ_UNUSED_ARG(options);
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pj_gettimeofday(&now);
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PJ_TIME_VAL_SUB(now, ec->last_signal);
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delay_ms = PJ_TIME_VAL_MSEC(now);
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if (delay_ms < ec->tail_ms) {
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#if defined(PJMEDIA_ECHO_SUPPRESS_FACTOR) && PJMEDIA_ECHO_SUPPRESS_FACTOR!=0
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unsigned i;
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for (i=0; i<ec->samples_per_frame; ++i) {
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rec_frm[i] = (pj_int16_t)(rec_frm[i] >>
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PJMEDIA_ECHO_SUPPRESS_FACTOR);
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}
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#else
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pjmedia_zero_samples(rec_frm, ec->samples_per_frame);
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#endif
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}
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return PJ_SUCCESS;
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}
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/*
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* Perform echo cancellation.
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*/
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PJ_DEF(pj_status_t) echo_supp_cancel_echo( void *state,
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pj_int16_t *rec_frm,
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const pj_int16_t *play_frm,
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unsigned options,
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void *reserved )
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{
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echo_supp *ec = (echo_supp*) state;
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pj_bool_t silence;
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PJ_UNUSED_ARG(options);
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PJ_UNUSED_ARG(reserved);
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silence = pjmedia_silence_det_detect(ec->sd, play_frm,
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ec->samples_per_frame, NULL);
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if (!silence) {
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#if defined(PJMEDIA_ECHO_SUPPRESS_FACTOR) && PJMEDIA_ECHO_SUPPRESS_FACTOR!=0
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unsigned i;
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for (i=0; i<ec->samples_per_frame; ++i) {
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rec_frm[i] = (pj_int16_t)(rec_frm[i] >>
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PJMEDIA_ECHO_SUPPRESS_FACTOR);
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}
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#else
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pjmedia_zero_samples(rec_frm, ec->samples_per_frame);
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#endif
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}
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return PJ_SUCCESS;
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}
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