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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/aec_port.h>
#include "../pjmedia-codec/speex/speex_echo.h"
#include <pjmedia/errno.h>
#include <pj/assert.h>
#include <pj/log.h>
#include <pj/pool.h>
#define THIS_FILE "aec_port.c"
#define SIGNATURE PJMEDIA_PORT_SIGNATURE('A', 'E', 'C', ' ')
struct aec_port
{
pjmedia_port base;
pjmedia_port *dn_port;
SpeexEchoState *state;
pj_int16_t *tmp_frame;
pj_bool_t has_frame;
pj_int16_t *last_frame;
};
static pj_status_t aec_put_frame(pjmedia_port *this_port,
const pjmedia_frame *frame);
static pj_status_t aec_get_frame(pjmedia_port *this_port,
pjmedia_frame *frame);
static pj_status_t aec_on_destroy(pjmedia_port *this_port);
PJ_DEF(pj_status_t) pjmedia_aec_port_create( pj_pool_t *pool,
pjmedia_port *dn_port,
unsigned tail_length,
pjmedia_port **p_port )
{
const pj_str_t AEC = { "AEC", 3 };
struct aec_port *aec_port;
int sampling_rate;
PJ_ASSERT_RETURN(pool && dn_port && p_port, PJ_EINVAL);
PJ_ASSERT_RETURN(dn_port->info.bits_per_sample==16 && tail_length,
PJ_EINVAL);
/* Create and initialize the port */
aec_port = pj_pool_zalloc(pool, sizeof(struct aec_port));
pjmedia_port_info_init(&aec_port->base.info, &AEC, SIGNATURE,
dn_port->info.clock_rate,
dn_port->info.channel_count,
dn_port->info.bits_per_sample,
dn_port->info.samples_per_frame);
aec_port->state = speex_echo_state_init(dn_port->info.samples_per_frame,
tail_length);
/* Set sampling rate */
sampling_rate = 0;
speex_echo_ctl(aec_port->state, SPEEX_ECHO_GET_SAMPLING_RATE,
&sampling_rate);
sampling_rate = dn_port->info.clock_rate;
speex_echo_ctl(aec_port->state, SPEEX_ECHO_SET_SAMPLING_RATE,
&sampling_rate);
/* More init */
aec_port->dn_port = dn_port;
aec_port->base.get_frame = &aec_get_frame;
aec_port->base.put_frame = &aec_put_frame;
aec_port->base.on_destroy = &aec_on_destroy;
aec_port->last_frame = pj_pool_zalloc(pool, sizeof(pj_int16_t) *
dn_port->info.samples_per_frame);
aec_port->tmp_frame = pj_pool_zalloc(pool, sizeof(pj_int16_t) *
dn_port->info.samples_per_frame);
/* Done */
*p_port = &aec_port->base;
PJ_LOG(4,(THIS_FILE, "AEC created for port %.*s",
(int)dn_port->info.name.slen,
dn_port->info.name.ptr));
return PJ_SUCCESS;
}
static pj_status_t aec_put_frame(pjmedia_port *this_port,
const pjmedia_frame *frame)
{
struct aec_port *aec_port = (struct aec_port*)this_port;
PJ_ASSERT_RETURN(this_port->info.signature == SIGNATURE, PJ_EINVAL);
if (frame->type == PJMEDIA_FRAME_TYPE_NONE || !aec_port->has_frame) {
return pjmedia_port_put_frame(aec_port->dn_port, frame);
}
PJ_ASSERT_RETURN(frame->size == this_port->info.samples_per_frame * 2,
PJ_EINVAL);
speex_echo_cancel(aec_port->state,
(const spx_int16_t*)frame->buf,
(const spx_int16_t*)aec_port->last_frame,
(spx_int16_t*)aec_port->tmp_frame,
NULL);
pjmedia_copy_samples(frame->buf, aec_port->tmp_frame,
this_port->info.samples_per_frame);
return pjmedia_port_put_frame(aec_port->dn_port, frame);
}
static pj_status_t aec_get_frame( pjmedia_port *this_port,
pjmedia_frame *frame)
{
struct aec_port *aec_port = (struct aec_port*)this_port;
pj_status_t status;
PJ_ASSERT_RETURN(this_port->info.signature == SIGNATURE, PJ_EINVAL);
status = pjmedia_port_get_frame(aec_port->dn_port, frame);
if (status==PJ_SUCCESS && frame->type==PJMEDIA_FRAME_TYPE_AUDIO) {
aec_port->has_frame = PJ_TRUE;
pjmedia_copy_samples(aec_port->tmp_frame, frame->buf,
this_port->info.samples_per_frame);
} else {
aec_port->has_frame = PJ_FALSE;
}
return status;
}
static pj_status_t aec_on_destroy(pjmedia_port *this_port)
{
struct aec_port *aec_port = (struct aec_port*)this_port;
PJ_ASSERT_RETURN(this_port->info.signature == SIGNATURE, PJ_EINVAL);
speex_echo_state_destroy(aec_port->state);
return PJ_SUCCESS;
}
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