types.h

一个开源的sip源代码

/* $Id: types.h 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 
 */
#ifndef __PJMEDIA_TYPES_H__
#define __PJMEDIA_TYPES_H__

/**
 * @file pjmedia/types.h Basic Types
 * @brief Basic PJMEDIA types.
 */

#include <pjmedia/config.h>
#include <pj/sock.h>	    /* pjmedia_sock_info	*/
#include <pj/string.h>	    /* pj_memcpy(), pj_memset() */


/**
 * @defgroup PJMEDIA_FRAME_OP Frame Operations
 * @ingroup PJMEDIA
 */

/**
 * @defgroup PJMEDIA_MISC Misc
 * @ingroup PJMEDIA
 */

/**
 * @defgroup PJMEDIA_TYPES Basic Types
 * @ingroup PJMEDIA_BASE
 * @brief Basic PJMEDIA types and operations.
 * @{
 */

/** 
 * Top most media type. 
 */
typedef enum pjmedia_type
{
    /** No type. */
    PJMEDIA_TYPE_NONE = 0,

    /** The media is audio */
    PJMEDIA_TYPE_AUDIO = 1,

    /** The media is video. */
    PJMEDIA_TYPE_VIDEO = 2,

    /** Unknown media type, in this case the name will be specified in 
     *  encoding_name.
     */
    PJMEDIA_TYPE_UNKNOWN = 3

} pjmedia_type;



/** 
 * Media direction. 
 */
typedef enum pjmedia_dir
{
    /** None */
    PJMEDIA_DIR_NONE = 0,

    /** Encoding (outgoing to network) stream */
    PJMEDIA_DIR_ENCODING = 1,

    /** Decoding (incoming from network) stream. */
    PJMEDIA_DIR_DECODING = 2,

    /** Incoming and outgoing stream. */
    PJMEDIA_DIR_ENCODING_DECODING = 3

} pjmedia_dir;



/* Alternate names for media direction: */

/**
 * Direction is capturing audio frames.
 */
#define PJMEDIA_DIR_CAPTURE	PJMEDIA_DIR_ENCODING

/**
 * Direction is playback of audio frames.
 */
#define PJMEDIA_DIR_PLAYBACK	PJMEDIA_DIR_DECODING

/**
 * Direction is both capture and playback.
 */
#define PJMEDIA_DIR_CAPTURE_PLAYBACK	PJMEDIA_DIR_ENCODING_DECODING


/**
 * Create 32bit port signature from ASCII characters.
 */
#define PJMEDIA_PORT_SIGNATURE(a,b,c,d)	    \
	    (a<<24 | b<<16 | c<<8 | d)


/** 
 * Opague declaration of media endpoint. 
 */
typedef struct pjmedia_endpt pjmedia_endpt;


/*
 * Forward declaration for stream (needed by transport).
 */
typedef struct pjmedia_stream pjmedia_stream;


/** 
 * Media socket info is used to describe the underlying sockets
 * to be used as media transport.
 */
typedef struct pjmedia_sock_info
{
    /** The RTP socket handle */
    pj_sock_t	    rtp_sock;

    /** Address to be advertised as the local address for the RTP
     *  socket, which does not need to be equal as the bound
     *  address (for example, this address can be the address resolved
     *  with STUN).
     */
    pj_sockaddr_in  rtp_addr_name;

    /** The RTCP socket handle. */
    pj_sock_t	    rtcp_sock;

    /** Address to be advertised as the local address for the RTCP
     *  socket, which does not need to be equal as the bound
     *  address (for example, this address can be the address resolved
     *  with STUN).
     */
    pj_sockaddr_in  rtcp_addr_name;

} pjmedia_sock_info;


/**
 * This is a general purpose function set PCM samples to zero.
 * Since this function is needed by many parts of the library, 
 * by putting this functionality in one place, it enables some.
 * clever people to optimize this function.
 *
 * @param samples	The 16bit PCM samples.
 * @param count		Number of samples.
 */
PJ_INLINE(void) pjmedia_zero_samples(pj_int16_t *samples, unsigned count)
{
#if 1
    pj_bzero(samples, count*sizeof(pj_int16_t));
#elif 0
    unsigned i;
    for (i=0; i<count; ++i) samples[i] = 0;
#else
    unsigned i;
    count >>= 1;
    for (i=0; i<count; ++i) ((pj_int32_t*)samples)[i] = (pj_int32_t)0;
#endif
}


/**
 * This is a general purpose function to copy samples from/to buffers with
 * equal size. Since this function is needed by many parts of the library, 
 * by putting this functionality in one place, it enables some.
 * clever people to optimize this function.
 */
PJ_INLINE(void) pjmedia_copy_samples(pj_int16_t *dst, const pj_int16_t *src,
				     unsigned count)
{
#if 1
    pj_memcpy(dst, src, count*sizeof(pj_int16_t));
#elif 0
    unsigned i;
    for (i=0; i<count; ++i) dst[i] = src[i];
#else
    unsigned i;
    count >>= 1;
    for (i=0; i<count; ++i) 
	((pj_int32_t*)dst)[i] = ((pj_int32_t*)src)[i];
#endif
}


/**
 * @}
 */


#endif	/* __PJMEDIA_TYPES_H__ */