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/* $Id$ */
/*
* Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
* Copyright (C) 2003-2008 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/resample.h>
#include <pjmedia/errno.h>
#include <pj/assert.h>
#include <pj/pool.h>
#include <pj/string.h>
#define BYTES_PER_SAMPLE 2
#define SIGNATURE PJMEDIA_SIG_PORT_RESAMPLE
struct resample_port
{
pjmedia_port base;
pjmedia_port *dn_port;
unsigned options;
pjmedia_resample *resample_get;
pjmedia_resample *resample_put;
pj_int16_t *get_buf;
pj_int16_t *put_buf;
};
static pj_status_t resample_put_frame(pjmedia_port *this_port,
pjmedia_frame *frame);
static pj_status_t resample_get_frame(pjmedia_port *this_port,
pjmedia_frame *frame);
static pj_status_t resample_destroy(pjmedia_port *this_port);
PJ_DEF(pj_status_t) pjmedia_resample_port_create( pj_pool_t *pool,
pjmedia_port *dn_port,
unsigned clock_rate,
unsigned opt,
pjmedia_port **p_port )
{
const pj_str_t name = pj_str("resample");
struct resample_port *rport;
pjmedia_audio_format_detail *d_afd, *r_afd;
pj_status_t status;
/* Validate arguments. */
PJ_ASSERT_RETURN(pool && dn_port && clock_rate && p_port, PJ_EINVAL);
/* Only supports 16bit samples per frame */
PJ_ASSERT_RETURN(PJMEDIA_PIA_BITS(&dn_port->info) == 16, PJMEDIA_ENCBITS);
d_afd = pjmedia_format_get_audio_format_detail(&dn_port->info.fmt, 1);
/* Create and initialize port. */
rport = PJ_POOL_ZALLOC_T(pool, struct resample_port);
PJ_ASSERT_RETURN(rport != NULL, PJ_ENOMEM);
pjmedia_port_info_init(&rport->base.info, &name, SIGNATURE, clock_rate,
d_afd->channel_count, BYTES_PER_SAMPLE * 8,
clock_rate * d_afd->frame_time_usec / 1000000);
rport->dn_port = dn_port;
rport->options = opt;
r_afd = pjmedia_format_get_audio_format_detail(&rport->base.info.fmt, 1);
/* Create buffers.
* We need separate buffer for get_frame() and put_frame() since
* both functions may run simultaneously.
*/
rport->get_buf = (pj_int16_t*)
pj_pool_alloc(pool, PJMEDIA_PIA_AVG_FSZ(&dn_port->info));
PJ_ASSERT_RETURN(rport->get_buf != NULL, PJ_ENOMEM);
rport->put_buf = (pj_int16_t*)
pj_pool_alloc(pool, PJMEDIA_PIA_AVG_FSZ(&dn_port->info));
PJ_ASSERT_RETURN(rport->put_buf != NULL, PJ_ENOMEM);
/* Create "get_frame" resample */
status = pjmedia_resample_create(pool,
(opt&PJMEDIA_RESAMPLE_USE_LINEAR)==0,
(opt&PJMEDIA_RESAMPLE_USE_SMALL_FILTER)==0,
d_afd->channel_count,
d_afd->clock_rate,
r_afd->clock_rate,
PJMEDIA_PIA_SPF(&dn_port->info),
&rport->resample_get);
if (status != PJ_SUCCESS)
return status;
/* Create "put_frame" resample */
status = pjmedia_resample_create(pool,
(opt&PJMEDIA_RESAMPLE_USE_LINEAR)==0,
(opt&PJMEDIA_RESAMPLE_USE_SMALL_FILTER)==0,
d_afd->channel_count,
r_afd->clock_rate,
d_afd->clock_rate,
PJMEDIA_PIA_SPF(&rport->base.info),
&rport->resample_put);
/* Media port interface */
rport->base.get_frame = &resample_get_frame;
rport->base.put_frame = &resample_put_frame;
rport->base.on_destroy = &resample_destroy;
/* Done */
*p_port = &rport->base;
return PJ_SUCCESS;
}
static pj_status_t resample_put_frame(pjmedia_port *this_port,
pjmedia_frame *frame)
{
struct resample_port *rport = (struct resample_port*) this_port;
pjmedia_frame downstream_frame;
/* Return if we don't have downstream port. */
if (rport->dn_port == NULL) {
return PJ_SUCCESS;
}
if (frame->type == PJMEDIA_FRAME_TYPE_AUDIO) {
pjmedia_resample_run( rport->resample_put,
(const pj_int16_t*) frame->buf,
rport->put_buf);
downstream_frame.buf = rport->put_buf;
downstream_frame.size = PJMEDIA_PIA_AVG_FSZ(&rport->dn_port->info);
} else {
downstream_frame.buf = frame->buf;
downstream_frame.size = frame->size;
}
downstream_frame.type = frame->type;
downstream_frame.timestamp.u64 = frame->timestamp.u64;
return pjmedia_port_put_frame( rport->dn_port, &downstream_frame );
}
static pj_status_t resample_get_frame(pjmedia_port *this_port,
pjmedia_frame *frame)
{
struct resample_port *rport = (struct resample_port*) this_port;
pjmedia_frame tmp_frame;
pj_status_t status;
/* Return silence if we don't have downstream port */
if (rport->dn_port == NULL) {
pj_bzero(frame->buf, frame->size);
return PJ_SUCCESS;
}
tmp_frame.buf = rport->get_buf;
tmp_frame.size = PJMEDIA_PIA_AVG_FSZ(&rport->dn_port->info);
tmp_frame.timestamp.u64 = frame->timestamp.u64;
tmp_frame.type = PJMEDIA_FRAME_TYPE_AUDIO;
status = pjmedia_port_get_frame( rport->dn_port, &tmp_frame);
if (status != PJ_SUCCESS)
return status;
if (tmp_frame.type != PJMEDIA_FRAME_TYPE_AUDIO) {
frame->type = tmp_frame.type;
frame->timestamp = tmp_frame.timestamp;
/* Copy whatever returned as long as the buffer size is enough */
frame->size = tmp_frame.size < PJMEDIA_PIA_AVG_FSZ(&rport->base.info) ?
tmp_frame.size : PJMEDIA_PIA_AVG_FSZ(&rport->base.info);
if (tmp_frame.size) {
pjmedia_copy_samples((pj_int16_t*)frame->buf,
(const pj_int16_t*)tmp_frame.buf,
frame->size >> 1);
}
return PJ_SUCCESS;
}
pjmedia_resample_run( rport->resample_get,
(const pj_int16_t*) tmp_frame.buf,
(pj_int16_t*) frame->buf);
frame->size = PJMEDIA_PIA_AVG_FSZ(&rport->base.info);
frame->type = PJMEDIA_FRAME_TYPE_AUDIO;
return PJ_SUCCESS;
}
static pj_status_t resample_destroy(pjmedia_port *this_port)
{
struct resample_port *rport = (struct resample_port*) this_port;
if ((rport->options & PJMEDIA_RESAMPLE_DONT_DESTROY_DN)==0) {
pjmedia_port_destroy(rport->dn_port);
rport->dn_port = NULL;
}
if (rport->resample_get) {
pjmedia_resample_destroy(rport->resample_get);
rport->resample_get = NULL;
}
if (rport->resample_put) {
pjmedia_resample_destroy(rport->resample_put);
rport->resample_put = NULL;
}
return PJ_SUCCESS;
}
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