Session Description Protocol

Collaboration diagram for Session Description Protocol:

Files
file	sdp.h
	Session Description Protocol (SDP)

Data Structures
struct	vlc_sdp_attr
	SDP attribute. More...
struct	vlc_sdp_conn
	SDP connection address. More...
struct	vlc_sdp_media
	SDP media. More...
struct	vlc_sdp
	SDP session descriptor. More...

Functions
struct vlc_sdp *	vlc_sdp_parse (const char *str, size_t length)
	Parses an SDP session descriptor. More...
void	vlc_sdp_free (struct vlc_sdp *sdp)
	Destroys a parsed SDP session descriptor. More...
const struct vlc_sdp_attr *	vlc_sdp_attr_first_by_name (struct vlc_sdp_attr *const *ap, const char *name)
static const struct vlc_sdp_attr *	vlc_sdp_media_attr_get (const struct vlc_sdp_media *media, const char *name)
	Gets a media attribute by name. More...
static bool	vlc_sdp_media_attr_present (const struct vlc_sdp_media *media, const char *name)
	Checks if a median attribute is present. More...
static const char *	vlc_sdp_media_attr_value (const struct vlc_sdp_media *media, const char *name)
	Returns a media attribute value. More...
static const struct vlc_sdp_conn *	vlc_sdp_media_conn (const struct vlc_sdp_media *media)
	Returns the media connection address list. More...
static const struct vlc_sdp_attr *	vlc_sdp_attr_get (const struct vlc_sdp *sdp, const char *name)
	Gets a session attribute by name. More...
static bool	vlc_sdp_attr_present (const struct vlc_sdp *sdp, const char *name)
	Checks if a session attribute is present. More...
static const char *	vlc_sdp_attr_value (const struct vlc_sdp *sdp, const char *name)
	Returns a session attribute value. More...

Detailed Description

Function Documentation

vlc_sdp_attr_first_by_name()

const struct vlc_sdp_attr * vlc_sdp_attr_first_by_name	(	struct vlc_sdp_attr *const *	ap,
		const char *	name
	)

References name, and vlc_sdp_attr::next.

Referenced by vlc_sdp_attr_get(), and vlc_sdp_media_attr_get().

vlc_sdp_attr_get()

static const struct vlc_sdp_attr * vlc_sdp_attr_get ( const struct vlc_sdp *  sdp, const char *  name  )

inlinestatic

Gets a session attribute by name.

Parameters

sdp	Session descriptor.
name	Attribute name.

Returns

the first attribute with the specified name or NULL if not found.

References vlc_sdp::attrs, name, and vlc_sdp_attr_first_by_name().

Referenced by vlc_sdp_attr_present(), and vlc_sdp_attr_value().

vlc_sdp_attr_present()

static bool vlc_sdp_attr_present ( const struct vlc_sdp *  sdp, const char *  name  )

inlinestatic

Checks if a session attribute is present.

Parameters

sdp	Session descriptor.
name	Attribute name.

Return values

true	if present
false	it absent

References name, and vlc_sdp_attr_get().

vlc_sdp_attr_value()

static const char * vlc_sdp_attr_value ( const struct vlc_sdp *  sdp, const char *  name  )

inlinestatic

Returns a session attribute value.

Parameters

sdp	Session descriptor.
name	Attribute name.

Note

This function cannot distinguish the cases of a missing attribute and of an attribute without a value. Use vlc_sdp_attr_present() to check for value-less attributes.

Returns

Nul-terminated attribute value, or NULL if none.

References name, vlc_sdp_attr::value, and vlc_sdp_attr_get().

Referenced by OpenSDP().

vlc_sdp_free()

void vlc_sdp_free

(

struct vlc_sdp *

sdp

)

Destroys a parsed SDP session descriptor.

References vlc_sdp::attrs, vlc_sdp::conn, vlc_sdp::info, vlc_sdp::media, vlc_sdp::name, vlc_sdp_attr_free(), vlc_sdp_conn_free(), and vlc_sdp_media_free().

Referenced by OpenSDP(), and vlc_sdp_parse().

vlc_sdp_media_attr_get()

static const struct vlc_sdp_attr * vlc_sdp_media_attr_get ( const struct vlc_sdp_media *  media, const char *  name  )

inlinestatic

Gets a media attribute by name.

Parameters

media	Session media descriptor.
name	Session attribute name.

Note

This function does not look for session attributes, as this is not always appropriate. To fallback to session attributes, call vlc_sdp_attr_get() explicitly.

Returns

the first attribute with the specified name or NULL if not found.

References vlc_sdp_media::attrs, name, and vlc_sdp_attr_first_by_name().

Referenced by vlc_sdp_media_attr_present(), and vlc_sdp_media_attr_value().

vlc_sdp_media_attr_present()

static bool vlc_sdp_media_attr_present ( const struct vlc_sdp_media *  media, const char *  name  )

inlinestatic

Checks if a median attribute is present.

Parameters

media	Media descriptor.
name	Attribute name.

Return values

true	if present
false	it absent

References name, and vlc_sdp_media_attr_get().

Referenced by OpenSDP().

vlc_sdp_media_attr_value()

static const char * vlc_sdp_media_attr_value ( const struct vlc_sdp_media *  media, const char *  name  )

inlinestatic

Returns a media attribute value.

Parameters

media	Media descriptor.
name	Attribute name.

Note

This function cannot distinguish the cases of a missing attribute and of an attribute without a value. Use vlc_sdp_media_attr_present() to check for value-less attributes.

Returns

Nul-terminated attribute value, or NULL if none.

References name, vlc_sdp_attr::value, and vlc_sdp_media_attr_get().

Referenced by OpenSDP().

vlc_sdp_media_conn()

static const struct vlc_sdp_conn * vlc_sdp_media_conn ( const struct vlc_sdp_media *  media )

inlinestatic

Returns the media connection address list.

References vlc_sdp::conn, vlc_sdp_media::conns, and vlc_sdp_media::session.

vlc_sdp_parse()

struct vlc_sdp * vlc_sdp_parse	(	const char *	str,
		size_t	length
	)

Parses an SDP session descriptor.

Parameters

str	start address of the descriptor
length	bytes length of the descriptor

Returns

a parsed SDP or NULL on error (errno is set)

References vlc_sdp_media::attrs, vlc_sdp::attrs, vlc_sdp::conn, vlc_sdp_media::conns, vlc_sdp::info, vlc_sdp::media, vlc_sdp::name, vlc_sdp_attr::next, vlc_sdp_conn::next, vlc_sdp_media::next, strndup(), unlikely, vlc_sdp_attr_parse(), vlc_sdp_conn_parse(), vlc_sdp_free(), vlc_sdp_getline(), and vlc_sdp_media_parse().

Referenced by OpenSDP().