diff options
Diffstat (limited to 'pjmedia/src')
| -rw-r--r-- | pjmedia/src/pjmedia/aec_port.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/pjmedia/src/pjmedia/aec_port.c b/pjmedia/src/pjmedia/aec_port.c new file mode 100644 index 00000000..d00d9298 --- /dev/null +++ b/pjmedia/src/pjmedia/aec_port.c @@ -0,0 +1,162 @@ +/* $Id$ */ +/* + * 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; +} + + |