org.restcomm.media.sdp.attributes

Class SsrcAttribute

java.lang.Object

org.restcomm.media.sdp.fields.AttributeField

org.restcomm.media.sdp.attributes.SsrcAttribute

All Implemented Interfaces:

SdpField

public class SsrcAttribute
extends AttributeField

a=ssrc:[ssrc-id] [attribute]
a=ssrc:[ssrc-id] [attribute]:[value]

The SDP media attribute "ssrc" indicates a property (known as a "source-level attribute") of a media source (RTP stream) within an RTP session.

ssrc-id is the synchronization source (SSRC) ID of the source being described, interpreted as a 32-bit unsigned integer in network byte order and represented in decimal.

attribute or attribute:value represents the source-level attribute specific to the given media source.
The source-level attribute follows the syntax of the SDP "a=" line. It thus consists of either a single attribute name (a flag) or an attribute name and value, e.g., "cname:user@example.com". No attributes of the former type are defined by this document.

Within a media stream, "ssrc" attributes with the same value of describe different attributes of the same media sources. Across media streams, values are not correlated (unless correlation is indicated by media-stream grouping or some other mechanism) and MAY be repeated.

Each "ssrc" media attribute specifies a single source-level attribute for the given . For each source mentioned in SDP, the source-level attribute "cname" MUST be provided. Any number of other source-level attributes for the source MAY also be provided.

Author:

Henrique Rosa (henrique.rosa@telestax.com)

See Also:

RFC5576

Field Summary

Fields

Modifier and Type	Field and Description
static String	ATTRIBUTE_TYPE
static String	BEGIN
static String	NEWLINE

Fields inherited from class org.restcomm.media.sdp.fields.AttributeField

ATTRIBUTE_SEPARATOR, BEGIN_LENGTH, builder, FIELD_TYPE, key, value

Fields inherited from interface org.restcomm.media.sdp.SdpField

FIELD_SEPARATOR

Constructor Summary

Constructors

Constructor and Description
SsrcAttribute(String ssrcId)

Method Summary

Modifier and Type	Method and Description
void	addAttribute(String attribute, String value)
String	getAttributeValue(String attribute)
String	getLastAttribute() Gets the name of the last inserted attribute.
String	getLastValue() Gets the value of the last inserted attribute
String	getSsrcId()
void	reset()
void	setSsrcId(String ssrcId)
String	toString()

Methods inherited from class org.restcomm.media.sdp.fields.AttributeField

getFieldType, getKey, getValue

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

ATTRIBUTE_TYPE

public static final String ATTRIBUTE_TYPE

See Also:

Constant Field Values

BEGIN

public static final String BEGIN

See Also:

Constant Field Values

NEWLINE

public static final String NEWLINE

See Also:

Constant Field Values

Constructor Detail

SsrcAttribute

public SsrcAttribute(String ssrcId)

Method Detail

setSsrcId

public void setSsrcId(String ssrcId)

getSsrcId

public String getSsrcId()

getAttributeValue

public String getAttributeValue(String attribute)

addAttribute

public void addAttribute(String attribute,
                         String value)

getLastAttribute

public String getLastAttribute()

Gets the name of the last inserted attribute.

Returns:

the name of the attribute

getLastValue

public String getLastValue()

Gets the value of the last inserted attribute

Returns:

the value of the attribute

reset

public void reset()

toString

public String toString()

Overrides:

toString in class AttributeField