org.jnetpcap.protocol.voip
Class Sdp

java.lang.Object
  org.jnetpcap.nio.JMemory
      org.jnetpcap.nio.JBuffer
          org.jnetpcap.packet.JHeader
              org.jnetpcap.packet.JMappedHeader
                  org.jnetpcap.protocol.voip.Sdp

All Implemented Interfaces:

JPayloadAccessor

@Header
public class Sdp
extends JMappedHeader

The Session Description Protocol (SDP) is a format for describing streaming media initialization parameters. The IETF published the original specification as an IETF Proposed Standard in April 1998,[1] and subsequently published a revised specification as an IETF Proposed Standard as RFC 4566 in July 2006.[2]

SDP is intended for describing multimedia communication sessions for the purposes of session announcement, session invitation, and parameter negotiation. SDP does not deliver media itself but is used for negotiation between end points of media type, format, and all associated properties. The set of properties and parameters are often called a session profile. SDP is designed to be extensible to support new media types and formats.

SDP started off as a component of the Session Announcement Protocol (SAP), but found other uses in conjunction with Real-time Transport Protocol (RTP), Real-time Streaming Protocol (RTSP), Session Initiation Protocol (SIP) and even as a standalone format for describing multicast sessions.

Description source: http://en.wikipedia.org/wiki/Session_Description_Protocol

Author:

Mark Bednarczyk, Sly Technologies, Inc.

Nested Class Summary

static class

Sdp.Fields A table of various fields for SDP protocol.

Nested classes/interfaces inherited from class org.jnetpcap.packet.JHeader

JHeader.State

Nested classes/interfaces inherited from class org.jnetpcap.nio.JMemory

JMemory.Type

Field Summary

static int

ID Constant numerial ID for this protocol's header.

Fields inherited from class org.jnetpcap.packet.JHeader

annotatedHeader, BYTE, EMPTY_HEADER_ARRAY, isSubHeader, packet, state

Fields inherited from class org.jnetpcap.nio.JMemory

JNETPCAP_LIBRARY_NAME, MAX_DIRECT_MEMORY_DEFAULT, POINTER

Constructor Summary

Sdp()

Method Summary

java.lang.String[]	attributes() Returns as array of Strings with all the attributes of this message.
int	attributesLength() Returns the length of the 'attributes' field.
int	attributesOffset() Returns the offset into the header for the 'attributes' field.
protected void	decodeHeader() Decode header.
static int	headerLength(JBuffer buffer, int offset) Calculates the length of this header from a static context.
java.lang.String	text() Experimental function.
int	textLength() Experimental function.

Methods inherited from class org.jnetpcap.packet.JMappedHeader

addField, addField, addField, clearFields, fieldArray, fieldDescription, fieldDescription, fieldDisplay, fieldDisplay, fieldLength, fieldLength, fieldOffset, fieldOffset, fieldValue, fieldValue, fieldValue, fieldValue, hasField, hasField, map, map

Methods inherited from class org.jnetpcap.packet.JHeader

decode, getAnnotatedHeader, getDescription, getFields, getGap, getGapLength, getGapOffset, getHeader, getHeaderLength, getHeaderOffset, getId, getIndex, getLength, getName, getNextHeaderId, getNextHeaderOffset, getNicname, getOffset, getPacket, getParent, getPayload, getPayloadLength, getPayloadOffset, getPostfix, getPostfixLength, getPostfixOffset, getPrefix, getPrefixLength, getPrefixOffset, getPreviousHeaderId, getPreviousHeaderOffset, getState, getSubHeaders, hasDescription, hasGap, hasNextHeader, hasPayload, hasPostfix, hasPrefix, hasPreviousHeader, hasSubHeaders, isFragmented, isGapTruncated, isHeaderTruncated, isPayloadTruncated, isPostfixTruncated, isPrefixTruncated, peer, peer, peerPayloadTo, setPacket, setSubHeaders, sizeof, toString, transferPayloadTo, transferPayloadTo, transferPayloadTo, validateHeader

Methods inherited from class org.jnetpcap.nio.JBuffer

findUTF8String, getByte, getByteArray, getByteArray, getByteArray, getDouble, getFloat, getInt, getLong, getShort, getUByte, getUInt, getUShort, getUTF8Char, getUTF8String, getUTF8String, getUTF8String, getUTF8String, isReadonly, order, order, peer, peer, peer, peer, setByte, setByteArray, setByteBuffer, setDouble, setFloat, setInt, setLong, setShort, setShort0, setUByte, setUInt, setUShort, transferFrom, transferFrom, transferFrom, transferTo, transferTo, transferTo

Methods inherited from class org.jnetpcap.nio.JMemory

availableDirectMemory, check, cleanup, createReference, isInitialized, isJMemoryBasedOwner, isOwner, maxDirectMemory, peer, reservedDirectMemory, setSize, size, softDirectMemory, toDebugString, toHexdump, toHexdump, totalActiveAllocated, totalAllocateCalls, totalAllocated, totalAllocatedSegments0To255Bytes, totalAllocatedSegments256OrAbove, totalDeAllocateCalls, totalDeAllocated, transferFrom, transferFrom, transferFromDirect, transferOwnership, transferTo, transferTo, transferTo, transferTo, transferTo, transferTo0

Methods inherited from class java.lang.Object

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

Field Detail

ID

public static int ID

Constant numerial ID for this protocol's header.

Constructor Detail

Sdp

public Sdp()

Method Detail

headerLength

@HeaderLength
public static int headerLength(JBuffer buffer,
                                            int offset)

Calculates the length of this header from a static context.

Parameters:

buffer - buffer containing the packet or this header content

offset - offset into the buffer where this header begins

Returns:

length in bytes for this header, excluding payload

attributes

@Field(offset=0,
       length=10,
       format="%s[]")
public java.lang.String[] attributes()

Returns as array of Strings with all the attributes of this message.

Returns:

array containing all the attributes found in this message

attributesLength

@Dynamic(value=LENGTH)
public int attributesLength()

Returns the length of the 'attributes' field.

Returns:

length of the 'attributes' field; the length is in bits

attributesOffset

@Dynamic(value=OFFSET)
public int attributesOffset()

Returns the offset into the header for the 'attributes' field.

Returns:

offset from the start of the header; the offset is in bits

decodeHeader

protected void decodeHeader()

Decode header.

Overrides:

decodeHeader in class JHeader

See Also:

JHeader.decodeHeader()

text

public java.lang.String text()

Experimental function.

Returns:

the entire SDP header as a text string

textLength

public int textLength()

Experimental function.

Returns:

size of the SDP header in bits