/usr/include/pjmedia/sdp.h is in libpjproject-dev 2.1.0.0.ast20130823-1.
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/*
* 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
*/
#ifndef __PJMEDIA_SDP_H__
#define __PJMEDIA_SDP_H__
/**
* @file sdp.h
* @brief SDP header file.
*/
#include <pjmedia/types.h>
#include <pj/sock.h>
/**
* @defgroup PJMEDIA_SDP SDP Parsing and Data Structure
* @ingroup PJMEDIA_SESSION
* @brief SDP data structure representation and parsing
* @{
*
* The basic SDP session descriptor and elements are described in header
* file <b><pjmedia/sdp.h></b>. This file contains declaration for
* SDP session descriptor and SDP media descriptor, along with their
* attributes. This file also declares functions to parse SDP message.
*/
PJ_BEGIN_DECL
/**
* The PJMEDIA_MAX_SDP_FMT macro defines maximum format in a media line.
*/
#ifndef PJMEDIA_MAX_SDP_FMT
# define PJMEDIA_MAX_SDP_FMT 32
#endif
/**
* The PJMEDIA_MAX_SDP_BANDW macro defines maximum bandwidth information
* lines in a media line.
*/
#ifndef PJMEDIA_MAX_SDP_BANDW
# define PJMEDIA_MAX_SDP_BANDW 4
#endif
/**
* The PJMEDIA_MAX_SDP_ATTR macro defines maximum SDP attributes in media and
* session descriptor.
*/
#ifndef PJMEDIA_MAX_SDP_ATTR
# define PJMEDIA_MAX_SDP_ATTR (PJMEDIA_MAX_SDP_FMT*2 + 4)
#endif
/**
* The PJMEDIA_MAX_SDP_MEDIA macro defines maximum SDP media lines in a
* SDP session descriptor.
*/
#ifndef PJMEDIA_MAX_SDP_MEDIA
# define PJMEDIA_MAX_SDP_MEDIA 16
#endif
/* **************************************************************************
* SDP ATTRIBUTES
***************************************************************************
*/
/**
* Generic representation of attribute.
*/
struct pjmedia_sdp_attr
{
pj_str_t name; /**< Attribute name. */
pj_str_t value; /**< Attribute value. */
};
/**
* @see pjmedia_sdp_attr
*/
typedef struct pjmedia_sdp_attr pjmedia_sdp_attr;
/**
* Create SDP attribute.
*
* @param pool Pool to create the attribute.
* @param name Attribute name.
* @param value Optional attribute value.
*
* @return The new SDP attribute.
*/
PJ_DECL(pjmedia_sdp_attr*) pjmedia_sdp_attr_create(pj_pool_t *pool,
const char *name,
const pj_str_t *value);
/**
* Clone attribute
*
* @param pool Pool to be used.
* @param attr The attribute to clone.
*
* @return New attribute as cloned from the attribute.
*/
PJ_DECL(pjmedia_sdp_attr*) pjmedia_sdp_attr_clone(pj_pool_t *pool,
const pjmedia_sdp_attr*attr);
/**
* Find the first attribute with the specified type.
*
* @param count Number of attributes in the array.
* @param attr_array Array of attributes.
* @param name Attribute name to find.
* @param fmt Optional string to indicate which payload format
* to find for \a rtpmap and \a fmt attributes. For other
* types of attributes, the value should be NULL.
*
* @return The specified attribute, or NULL if it can't be found.
*
* @see pjmedia_sdp_attr_find2, pjmedia_sdp_media_find_attr,
* pjmedia_sdp_media_find_attr2
*/
PJ_DECL(pjmedia_sdp_attr*)
pjmedia_sdp_attr_find(unsigned count,
pjmedia_sdp_attr *const attr_array[],
const pj_str_t *name, const pj_str_t *fmt);
/**
* Find the first attribute with the specified type.
*
* @param count Number of attributes in the array.
* @param attr_array Array of attributes.
* @param name Attribute name to find.
* @param fmt Optional string to indicate which payload format
* to find for \a rtpmap and \a fmt attributes. For other
* types of attributes, the value should be NULL.
*
* @return The specified attribute, or NULL if it can't be found.
*
* @see pjmedia_sdp_attr_find, pjmedia_sdp_media_find_attr,
* pjmedia_sdp_media_find_attr2
*/
PJ_DECL(pjmedia_sdp_attr*)
pjmedia_sdp_attr_find2(unsigned count,
pjmedia_sdp_attr *const attr_array[],
const char *name, const pj_str_t *fmt);
/**
* Add a new attribute to array of attributes.
*
* @param count Number of attributes in the array.
* @param attr_array Array of attributes.
* @param attr The attribute to add.
*
* @return PJ_SUCCESS or the error code.
*
* @see pjmedia_sdp_media_add_attr
*/
PJ_DECL(pj_status_t) pjmedia_sdp_attr_add(unsigned *count,
pjmedia_sdp_attr *attr_array[],
pjmedia_sdp_attr *attr);
/**
* Remove all attributes with the specified name in array of attributes.
*
* @param count Number of attributes in the array.
* @param attr_array Array of attributes.
* @param name Attribute name to find.
*
* @return Number of attributes removed.
*
* @see pjmedia_sdp_media_remove_all_attr
*/
PJ_DECL(unsigned) pjmedia_sdp_attr_remove_all(unsigned *count,
pjmedia_sdp_attr *attr_array[],
const char *name);
/**
* Remove the specified attribute from the attribute array.
*
* @param count Number of attributes in the array.
* @param attr_array Array of attributes.
* @param attr The attribute instance to remove.
*
* @return PJ_SUCCESS when attribute has been removed, or
* PJ_ENOTFOUND when the attribute can not be found.
*
* @see pjmedia_sdp_media_remove_attr
*/
PJ_DECL(pj_status_t) pjmedia_sdp_attr_remove(unsigned *count,
pjmedia_sdp_attr *attr_array[],
pjmedia_sdp_attr *attr);
/**
* This structure declares SDP \a rtpmap attribute.
*/
struct pjmedia_sdp_rtpmap
{
pj_str_t pt; /**< Payload type. */
pj_str_t enc_name; /**< Encoding name. */
unsigned clock_rate; /**< Clock rate. */
pj_str_t param; /**< Parameter. */
};
/**
* @see pjmedia_sdp_rtpmap
*/
typedef struct pjmedia_sdp_rtpmap pjmedia_sdp_rtpmap;
/**
* Convert generic attribute to SDP \a rtpmap. This function allocates
* a new attribute and call #pjmedia_sdp_attr_get_rtpmap().
*
* @param pool Pool used to create the rtpmap attribute.
* @param attr Generic attribute to be converted to rtpmap, which
* name must be "rtpmap".
* @param p_rtpmap Pointer to receive SDP rtpmap attribute.
*
* @return PJ_SUCCESS if the attribute can be successfully
* converted to \a rtpmap type.
*
* @see pjmedia_sdp_attr_get_rtpmap
*/
PJ_DECL(pj_status_t) pjmedia_sdp_attr_to_rtpmap(pj_pool_t *pool,
const pjmedia_sdp_attr *attr,
pjmedia_sdp_rtpmap **p_rtpmap);
/**
* Get the rtpmap representation of the same SDP attribute.
*
* @param attr Generic attribute to be converted to rtpmap, which
* name must be "rtpmap".
* @param rtpmap SDP \a rtpmap attribute to be initialized.
*
* @return PJ_SUCCESS if the attribute can be successfully
* converted to \a rtpmap attribute.
*
* @see pjmedia_sdp_attr_to_rtpmap
*/
PJ_DECL(pj_status_t) pjmedia_sdp_attr_get_rtpmap(const pjmedia_sdp_attr *attr,
pjmedia_sdp_rtpmap *rtpmap);
/**
* Convert \a rtpmap attribute to generic attribute.
*
* @param pool Pool to be used.
* @param rtpmap The \a rtpmap attribute.
* @param p_attr Pointer to receive the generic SDP attribute.
*
* @return PJ_SUCCESS on success.
*/
PJ_DECL(pj_status_t)
pjmedia_sdp_rtpmap_to_attr( pj_pool_t *pool,
const pjmedia_sdp_rtpmap *rtpmap,
pjmedia_sdp_attr **p_attr);
/**
* This structure describes SDP \a fmtp attribute.
*/
typedef struct pjmedia_sdp_fmtp
{
pj_str_t fmt; /**< Format type. */
pj_str_t fmt_param; /**< Format specific parameter. */
} pjmedia_sdp_fmtp;
/**
* Get the fmtp representation of the same SDP attribute.
*
* @param attr Generic attribute to be converted to fmtp, which
* name must be "fmtp".
* @param fmtp SDP fmtp attribute to be initialized.
*
* @return PJ_SUCCESS on success.
*/
PJ_DECL(pj_status_t) pjmedia_sdp_attr_get_fmtp(const pjmedia_sdp_attr *attr,
pjmedia_sdp_fmtp *fmtp);
/**
* This structure describes SDP \a rtcp attribute.
*/
typedef struct pjmedia_sdp_rtcp_attr
{
unsigned port; /**< RTCP port number. */
pj_str_t net_type; /**< Optional network type. */
pj_str_t addr_type; /**< Optional address type. */
pj_str_t addr; /**< Optional address. */
} pjmedia_sdp_rtcp_attr;
/**
* Parse a generic SDP attribute to get SDP rtcp attribute values.
*
* @param attr Generic attribute to be converted to rtcp, which
* name must be "rtcp".
* @param rtcp SDP rtcp attribute to be initialized.
*
* @return PJ_SUCCESS on success.
*/
PJ_DECL(pj_status_t) pjmedia_sdp_attr_get_rtcp(const pjmedia_sdp_attr *attr,
pjmedia_sdp_rtcp_attr *rtcp);
/**
* Create a=rtcp attribute.
*
* @param pool Pool to create the attribute.
* @param a Socket address.
*
* @return SDP RTCP attribute.
*/
PJ_DECL(pjmedia_sdp_attr*) pjmedia_sdp_attr_create_rtcp(pj_pool_t *pool,
const pj_sockaddr *a);
/* **************************************************************************
* SDP CONNECTION INFO
****************************************************************************
*/
/**
* This structure describes SDP connection info ("c=" line).
*/
struct pjmedia_sdp_conn
{
pj_str_t net_type; /**< Network type ("IN"). */
pj_str_t addr_type; /**< Address type ("IP4", "IP6"). */
pj_str_t addr; /**< The address. */
};
/**
* @see pjmedia_sdp_conn
*/
typedef struct pjmedia_sdp_conn pjmedia_sdp_conn;
/**
* Clone connection info.
*
* @param pool Pool to allocate memory for the new connection info.
* @param rhs The connection into to clone.
*
* @return The new connection info.
*/
PJ_DECL(pjmedia_sdp_conn*) pjmedia_sdp_conn_clone(pj_pool_t *pool,
const pjmedia_sdp_conn *rhs);
/**
* Compare connection info.
*
* @param conn1 The first connection info to compare.
* @param conn1 The second connection info to compare.
* @param option Comparison option, which should be zero for now.
*
* @return PJ_SUCCESS when both connection info are equal, otherwise
* returns PJMEDIA_SDP_ECONNNOTEQUAL.
*/
PJ_DECL(pj_status_t) pjmedia_sdp_conn_cmp(const pjmedia_sdp_conn *conn1,
const pjmedia_sdp_conn *conn2,
unsigned option);
/* **************************************************************************
* SDP BANDWIDTH INFO
****************************************************************************
*/
/**
* This structure describes SDP bandwidth info ("b=" line).
*/
typedef struct pjmedia_sdp_bandw
{
pj_str_t modifier; /**< Bandwidth modifier. */
pj_uint32_t value; /**< Bandwidth value. */
} pjmedia_sdp_bandw;
/**
* Clone bandwidth info.
*
* @param pool Pool to allocate memory for the new bandwidth info.
* @param rhs The bandwidth into to clone.
*
* @return The new bandwidth info.
*/
PJ_DECL(pjmedia_sdp_bandw*)
pjmedia_sdp_bandw_clone(pj_pool_t *pool, const pjmedia_sdp_bandw *rhs);
/* **************************************************************************
* SDP MEDIA INFO/LINE
****************************************************************************
*/
/**
* This structure describes SDP media descriptor. A SDP media descriptor
* starts with "m=" line and contains the media attributes and optional
* connection line.
*/
struct pjmedia_sdp_media
{
/** Media descriptor line ("m=" line) */
struct
{
pj_str_t media; /**< Media type ("audio", "video") */
pj_uint16_t port; /**< Port number. */
unsigned port_count; /**< Port count, used only when >2 */
pj_str_t transport; /**< Transport ("RTP/AVP") */
unsigned fmt_count; /**< Number of formats. */
pj_str_t fmt[PJMEDIA_MAX_SDP_FMT]; /**< Media formats. */
} desc;
pjmedia_sdp_conn *conn; /**< Optional connection info. */
unsigned bandw_count; /**< Number of bandwidth info. */
pjmedia_sdp_bandw *bandw[PJMEDIA_MAX_SDP_BANDW]; /**< Bandwidth info. */
unsigned attr_count; /**< Number of attributes. */
pjmedia_sdp_attr *attr[PJMEDIA_MAX_SDP_ATTR]; /**< Attributes. */
};
/**
* @see pjmedia_sdp_media
*/
typedef struct pjmedia_sdp_media pjmedia_sdp_media;
/**
* Clone SDP media description.
*
* @param pool Pool to allocate memory for the new media description.
* @param rhs The media descriptin to clone.
*
* @return New media description.
*/
PJ_DECL(pjmedia_sdp_media*)
pjmedia_sdp_media_clone( pj_pool_t *pool,
const pjmedia_sdp_media *rhs);
/**
* Find the first occurence of the specified attribute name in the media
* descriptor. Optionally the format may be specified.
*
* @param m The SDP media description.
* @param name Attribute name to find.
* @param fmt Optional payload type to match in the
* attribute list, when the attribute is \a rtpmap
* or \a fmtp. For other types of SDP attributes, this
* value should be NULL.
*
* @return The first instance of the specified attribute or NULL.
*/
PJ_DECL(pjmedia_sdp_attr*)
pjmedia_sdp_media_find_attr(const pjmedia_sdp_media *m,
const pj_str_t *name, const pj_str_t *fmt);
/**
* Find the first occurence of the specified attribute name in the SDP media
* descriptor. Optionally the format may be specified.
*
* @param m The SDP media description.
* @param name Attribute name to find.
* @param fmt Optional payload type to match in the
* attribute list, when the attribute is \a rtpmap
* or \a fmtp. For other types of SDP attributes, this
* value should be NULL.
*
* @return The first instance of the specified attribute or NULL.
*/
PJ_DECL(pjmedia_sdp_attr*)
pjmedia_sdp_media_find_attr2(const pjmedia_sdp_media *m,
const char *name, const pj_str_t *fmt);
/**
* Add new attribute to the media descriptor.
*
* @param m The SDP media description.
* @param attr Attribute to add.
*
* @return PJ_SUCCESS or the appropriate error code.
*/
PJ_DECL(pj_status_t) pjmedia_sdp_media_add_attr(pjmedia_sdp_media *m,
pjmedia_sdp_attr *attr);
/**
* Remove all attributes with the specified name from the SDP media
* descriptor.
*
* @param m The SDP media description.
* @param name Attribute name to remove.
*
* @return The number of attributes removed.
*/
PJ_DECL(unsigned)
pjmedia_sdp_media_remove_all_attr(pjmedia_sdp_media *m,
const char *name);
/**
* Remove the occurence of the specified attribute from the SDP media
* descriptor.
*
* @param m The SDP media descriptor.
* @param attr The attribute to find and remove.
*
* @return PJ_SUCCESS if the attribute can be found and has
* been removed from the array.
*/
PJ_DECL(pj_status_t)
pjmedia_sdp_media_remove_attr(pjmedia_sdp_media *m,
pjmedia_sdp_attr *attr);
/**
* Compare two SDP media for equality.
*
* @param sd1 The first SDP media to compare.
* @param sd2 The second SDP media to compare.
* @param option Comparison option, which should be zero for now.
*
* @return PJ_SUCCESS when both SDP medias are equal, or the
* appropriate status code describing which part of
* the descriptors that are not equal.
*/
PJ_DECL(pj_status_t) pjmedia_sdp_media_cmp(const pjmedia_sdp_media *sd1,
const pjmedia_sdp_media *sd2,
unsigned option);
/**
* Compare two media transports for compatibility.
*
* @param t1 The first media transport to compare.
* @param t2 The second media transport to compare.
*
* @return PJ_SUCCESS when both media transports are compatible,
* otherwise returns PJMEDIA_SDP_ETPORTNOTEQUAL.
*/
PJ_DECL(pj_status_t) pjmedia_sdp_transport_cmp(const pj_str_t *t1,
const pj_str_t *t2);
/**
* Deactivate SDP media.
*
* @param pool Memory pool to allocate memory from.
* @param m The SDP media to deactivate.
*
* @return PJ_SUCCESS when SDP media successfully deactivated,
* otherwise appropriate status code returned.
*/
PJ_DECL(pj_status_t) pjmedia_sdp_media_deactivate(pj_pool_t *pool,
pjmedia_sdp_media *m);
/**
* Clone SDP media description and deactivate the new SDP media.
*
* @param pool Memory pool to allocate memory for the clone.
* @param rhs The SDP media to clone.
*
* @return New media descrption with deactivated indication.
*/
PJ_DECL(pjmedia_sdp_media*) pjmedia_sdp_media_clone_deactivate(
pj_pool_t *pool,
const pjmedia_sdp_media *rhs);
/* **************************************************************************
* SDP SESSION DESCRIPTION
****************************************************************************
*/
/**
* This structure describes SDP session description. A SDP session descriptor
* contains complete information about a session, and normally is exchanged
* with remote media peer using signaling protocol such as SIP.
*/
struct pjmedia_sdp_session
{
/** Session origin (o= line) */
struct
{
pj_str_t user; /**< User */
pj_uint32_t id; /**< Session ID */
pj_uint32_t version; /**< Session version */
pj_str_t net_type; /**< Network type ("IN") */
pj_str_t addr_type; /**< Address type ("IP4", "IP6") */
pj_str_t addr; /**< The address. */
} origin;
pj_str_t name; /**< Subject line (s=) */
pjmedia_sdp_conn *conn; /**< Connection line (c=) */
unsigned bandw_count; /**< Number of bandwidth info (b=) */
pjmedia_sdp_bandw *bandw[PJMEDIA_MAX_SDP_BANDW];
/**< Bandwidth info array (b=) */
/** Session time (t= line) */
struct
{
pj_uint32_t start; /**< Start time. */
pj_uint32_t stop; /**< Stop time. */
} time;
unsigned attr_count; /**< Number of attributes. */
pjmedia_sdp_attr *attr[PJMEDIA_MAX_SDP_ATTR]; /**< Attributes array. */
unsigned media_count; /**< Number of media. */
pjmedia_sdp_media *media[PJMEDIA_MAX_SDP_MEDIA]; /**< Media array. */
};
/**
* @see pjmedia_sdp_session
*/
typedef struct pjmedia_sdp_session pjmedia_sdp_session;
/**
* Parse SDP message.
*
* @param pool The pool to allocate SDP session description.
* @param buf The message buffer.
* @param len The length of the message.
* @param p_sdp Pointer to receive the SDP session descriptor.
*
* @return PJ_SUCCESS if message was successfully parsed into
* SDP session descriptor.
*/
PJ_DECL(pj_status_t) pjmedia_sdp_parse( pj_pool_t *pool,
char *buf, pj_size_t len,
pjmedia_sdp_session **p_sdp );
/**
* Print SDP description to a buffer.
*
* @param sdp The SDP session description.
* @param buf The buffer.
* @param size The buffer length.
*
* @return the length printed, or -1 if the buffer is too
* short.
*/
PJ_DECL(int) pjmedia_sdp_print( const pjmedia_sdp_session *sdp,
char *buf, pj_size_t size);
/**
* Perform semantic validation for the specified SDP session descriptor.
* This function perform validation beyond just syntactic verification,
* such as to verify the value of network type and address type, check
* the connection line, and verify that \a rtpmap attribute is present
* when dynamic payload type is used.
*
* @param sdp The SDP session descriptor to validate.
*
* @return PJ_SUCCESS on success.
*/
PJ_DECL(pj_status_t) pjmedia_sdp_validate(const pjmedia_sdp_session *sdp);
/**
* Perform semantic validation for the specified SDP session descriptor.
* This function perform validation beyond just syntactic verification,
* such as to verify the value of network type and address type, check
* the connection line, and verify that \a rtpmap attribute is present
* when dynamic payload type is used.
*
* @param sdp The SDP session descriptor to validate.
* @param strict Flag whether the check should be strict, i.e: allow
* media without connection line when port is zero.
*
* @return PJ_SUCCESS on success.
*/
PJ_DECL(pj_status_t) pjmedia_sdp_validate2(const pjmedia_sdp_session *sdp,
pj_bool_t strict);
/**
* Clone SDP session descriptor.
*
* @param pool The pool used to clone the session.
* @param sdp The SDP session to clone.
*
* @return New SDP session.
*/
PJ_DECL(pjmedia_sdp_session*)
pjmedia_sdp_session_clone( pj_pool_t *pool,
const pjmedia_sdp_session *sdp);
/**
* Compare two SDP session for equality.
*
* @param sd1 The first SDP session to compare.
* @param sd2 The second SDP session to compare.
* @param option Must be zero for now.
*
* @return PJ_SUCCESS when both SDPs are equal, or otherwise
* the status code indicates which part of the session
* descriptors are not equal.
*/
PJ_DECL(pj_status_t) pjmedia_sdp_session_cmp(const pjmedia_sdp_session *sd1,
const pjmedia_sdp_session *sd2,
unsigned option);
/**
* Add new attribute to the session descriptor.
*
* @param s The SDP session description.
* @param attr Attribute to add.
*
* @return PJ_SUCCESS or the appropriate error code.
*/
PJ_DECL(pj_status_t) pjmedia_sdp_session_add_attr(pjmedia_sdp_session *s,
pjmedia_sdp_attr *attr);
PJ_END_DECL
/**
* @}
*/
#endif /* __PJMEDIA_SDP_H__ */
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