port.c

来自「基于sip协议的网络电话源码」· C语言 代码 · 共 109 行

/* $Id: port.c 974 2007-02-19 01:13:53Z bennylp $ */
/* 
 * Copyright (C) 2003-2007 Benny Prijono <[e-mail]>
 *
 * 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>

#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)
{
    pj_bzero(info, sizeof(*info));

    info->name = *name;
    info->signature = signature;
    info->type = PJMEDIA_TYPE_AUDIO;
    info->has_info = PJ_TRUE;
    info->need_info = PJ_FALSE;
    info->pt = 0xFF;
    info->encoding_name = pj_str("pcm");
    info->clock_rate = clock_rate;
    info->channel_count = channel_count;
    info->bits_per_sample = bits_per_sample;
    info->samples_per_frame = samples_per_frame;
    info->bytes_per_frame = samples_per_frame * bits_per_sample / 8;

    return PJ_SUCCESS;
}


/**
 * 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,
					    const 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;
}