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/* $Id: port.c 3893 2011-12-01 10:49:07Z ming $ */
/*
* 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/port.h>
#include <pjmedia/errno.h>
#include <pj/assert.h>
#include <pj/log.h>
#include <pj/pool.h>
#define THIS_FILE "port.c"
/**
* This is an auxiliary function to initialize port info for
* ports which deal with PCM audio.
*/
PJ_DEF(pj_status_t) pjmedia_port_info_init( pjmedia_port_info *info,
const pj_str_t *name,
unsigned signature,
unsigned clock_rate,
unsigned channel_count,
unsigned bits_per_sample,
unsigned samples_per_frame)
{
#define USEC_IN_SEC (pj_uint64_t)1000000
unsigned frame_time_usec, avg_bps;
pj_bzero(info, sizeof(*info));
info->signature = signature;
info->dir = PJMEDIA_DIR_ENCODING_DECODING;
info->name = *name;
frame_time_usec = (unsigned)(samples_per_frame * USEC_IN_SEC /
channel_count / clock_rate);
avg_bps = clock_rate * channel_count * bits_per_sample;
pjmedia_format_init_audio(&info->fmt, PJMEDIA_FORMAT_L16, clock_rate,
channel_count, bits_per_sample, frame_time_usec,
avg_bps, avg_bps);
return PJ_SUCCESS;
}
PJ_DEF(pj_status_t) pjmedia_port_info_init2( pjmedia_port_info *info,
const pj_str_t *name,
unsigned signature,
pjmedia_dir dir,
const pjmedia_format *fmt)
{
pj_bzero(info, sizeof(*info));
info->signature = signature;
info->dir = dir;
info->name = *name;
pjmedia_format_copy(&info->fmt, fmt);
return PJ_SUCCESS;
}
/**
* Get a clock source from the port.
*/
PJ_DEF(pjmedia_clock_src *) pjmedia_port_get_clock_src( pjmedia_port *port,
pjmedia_dir dir )
{
if (port && port->get_clock_src)
return port->get_clock_src(port, dir);
else
return NULL;
}
/**
* Get a frame from the port (and subsequent downstream ports).
*/
PJ_DEF(pj_status_t) pjmedia_port_get_frame( pjmedia_port *port,
pjmedia_frame *frame )
{
PJ_ASSERT_RETURN(port && frame, PJ_EINVAL);
if (port->get_frame)
return port->get_frame(port, frame);
else {
frame->type = PJMEDIA_FRAME_TYPE_NONE;
return PJ_EINVALIDOP;
}
}
/**
* Put a frame to the port (and subsequent downstream ports).
*/
PJ_DEF(pj_status_t) pjmedia_port_put_frame( pjmedia_port *port,
pjmedia_frame *frame )
{
PJ_ASSERT_RETURN(port && frame, PJ_EINVAL);
if (port->put_frame)
return port->put_frame(port, frame);
else
return PJ_EINVALIDOP;
}
/**
* Destroy port (and subsequent downstream ports)
*/
PJ_DEF(pj_status_t) pjmedia_port_destroy( pjmedia_port *port )
{
pj_status_t status;
PJ_ASSERT_RETURN(port, PJ_EINVAL);
if (port->on_destroy)
status = port->on_destroy(port);
else
status = PJ_SUCCESS;
return status;
}
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