java.lang.Object
- org.jitsi.service.neomedia.RTPExtension

```
public class RTPExtension
extends Object
```
RTP extensions are defined by RFC 5285 and they allow attaching additional information to some or all RTP packets of an RTP stream. This class describes RTP extensions in a way that makes them convenient for use in SDP generation/parsing.

Author:

Emil Ivov

Field Summary

Fields
Modifier and Type	Field	Description
`static String`	`ABS_SEND_TIME_URN`	The URN identifying the abs-send-time RTP extension.
`static String`	`CSRC_AUDIO_LEVEL_URN`	The URN identifying the RTP extension that allows mixers to send to conference participants the audio levels of all contributing sources.
`static String`	`FRAME_MARKING_URN`	The URN which identifies the framemarking RTP extension defined at draft-ietf-avtext-framemarking-03
`static String`	`ORIGINAL_HEADER_BLOCK_URN`	The URN which identifies the Original Header Block RTP extension defined in draft-ietf-perc-double-02.
`static String`	`RTP_STREAM_ID_URN`	The URN which identifies the rtp-stream-id extensions in draft-ietf-mmusic-rid-10.
`static String`	`SSRC_AUDIO_LEVEL_URN`	The URN identifying the RTP extension that allows clients to send to conference mixers the audio level of their packet payload.
`static String`	`TOF_URN`	The URN which identifies the transmission time-offset extensions in rfc5450.
`static String`	`TRANSPORT_CC_URN`	The URN which identifies the Transport-Wide Congestion Control RTP extension.
`static String`	`VIDEO_CONTENT_TYPE_URN`	The URN which identifies the RTP Header Extension for Video Content Type.

Constructor Summary

Constructors
Constructor	Description
`RTPExtension(URI extensionURI)`	Creates an `RTPExtension` instance for the specified `extensionURI` using a default `SENDRECV` direction and no extension attributes.
`RTPExtension(URI extensionURI, String extensionAttributes)`	Creates an `RTPExtension` instance for the specified `extensionURI` using a default `SENDRECV` direction and `extensionAttributes`.
`RTPExtension(URI extensionURI, MediaDirection direction)`	Creates an `RTPExtension` instance for the specified `extensionURI` and `direction`.
`RTPExtension(URI extensionURI, MediaDirection direction, String extensionAttributes)`	Creates an `RTPExtension` instance for the specified `extensionURI` and `direction` and sets the specified `extensionAttributes`.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`equals(Object o)`	Returns `true` if and only if `o` is an instance of `RTPExtension` and `o`'s `URI` is equal to this extension's `URI`.
`MediaDirection`	`getDirection()`	Returns the direction that the corresponding `MediaDevice` supports for this extension.
`String`	`getExtensionAttributes()`	Returns the extension attributes associated with this `RTPExtension` or `null` if this extension does not have any.
`URI`	`getURI()`	Returns the `URI` that identifies the format and meaning of this extension.
`int`	`hashCode()`	Returns the hash code of this extension instance which is actually the hash code of the `URI` that this extension is encapsulating.
`String`	`toString()`	Returns a `String` representation of this `RTPExtension`'s `URI`.

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - CSRC_AUDIO_LEVEL_URN
```
public static final String CSRC_AUDIO_LEVEL_URN
```
    The URN identifying the RTP extension that allows mixers to send to conference participants the audio levels of all contributing sources. Defined in RFC6465.
    
    See Also:
    
    Constant Field Values
  - SSRC_AUDIO_LEVEL_URN
```
public static final String SSRC_AUDIO_LEVEL_URN
```
    The URN identifying the RTP extension that allows clients to send to conference mixers the audio level of their packet payload. Defined in RFC6464.
    
    See Also:
    
    Constant Field Values
  - ABS_SEND_TIME_URN
```
public static final String ABS_SEND_TIME_URN
```
    The URN identifying the abs-send-time RTP extension. Defined at abs-send-time
    
    See Also:
    
    Constant Field Values
  - FRAME_MARKING_URN
```
public static final String FRAME_MARKING_URN
```
    The URN which identifies the framemarking RTP extension defined at draft-ietf-avtext-framemarking-03
    
    See Also:
    
    Constant Field Values
  - ORIGINAL_HEADER_BLOCK_URN
```
public static final String ORIGINAL_HEADER_BLOCK_URN
```
    The URN which identifies the Original Header Block RTP extension defined in draft-ietf-perc-double-02.
    
    See Also:
    
    Constant Field Values
  - TRANSPORT_CC_URN
```
public static final String TRANSPORT_CC_URN
```
    The URN which identifies the Transport-Wide Congestion Control RTP extension.
    
    See Also:
    
    Constant Field Values
  - RTP_STREAM_ID_URN
```
public static final String RTP_STREAM_ID_URN
```
    The URN which identifies the rtp-stream-id extensions in draft-ietf-mmusic-rid-10.
    
    See Also:
    
    Constant Field Values
  - TOF_URN
```
public static final String TOF_URN
```
    The URN which identifies the transmission time-offset extensions in rfc5450.
    
    See Also:
    
    Constant Field Values
  - VIDEO_CONTENT_TYPE_URN
```
public static final String VIDEO_CONTENT_TYPE_URN
```
    The URN which identifies the RTP Header Extension for Video Content Type.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - RTPExtension
```
public RTPExtension(URI extensionURI)
```
    Creates an RTPExtension instance for the specified extensionURI using a default SENDRECV direction and no extension attributes.
    
    Parameters:
    
    extensionURI - the URI (possibly a URN) of the RTP extension that we'd like to create.
  - RTPExtension
```
public RTPExtension(URI extensionURI,
                    MediaDirection direction)
```
    Creates an RTPExtension instance for the specified extensionURI and direction.
    
    Parameters:
    
    extensionURI - the URI (possibly a URN) of the RTP extension that we'd like to create.
    
    direction - a MediaDirection instance indication how this extension will be transmitted.
  - RTPExtension
```
public RTPExtension(URI extensionURI,
                    String extensionAttributes)
```
    Creates an RTPExtension instance for the specified extensionURI using a default SENDRECV direction and extensionAttributes.
    
    Parameters:
    
    extensionURI - the URI (possibly a URN) of the RTP extension that we'd like to create.
    
    extensionAttributes - any attributes that we'd like to add to this extension.
  - RTPExtension
```
public RTPExtension(URI extensionURI,
                    MediaDirection direction,
                    String extensionAttributes)
```
    Creates an RTPExtension instance for the specified extensionURI and direction and sets the specified extensionAttributes.
    
    Parameters:
    
    extensionURI - the URI (possibly a URN) of the RTP extension that we'd like to create.
    
    direction - a MediaDirection instance indication how this extension will be transmitted.
    
    extensionAttributes - any attributes that we'd like to add to this extension.
- Method Detail
  - getDirection
```
public MediaDirection getDirection()
```
    Returns the direction that the corresponding MediaDevice supports for this extension. By default RTP extension headers inherit the direction of a stream. When explicitly specified SENDONLY direction indicates an ability to attach the extension in outgoing RTP packets; a RECVONLY direction indicates a desire to receive the extension in incoming packets; a SENDRECV direction indicates both. An INACTIVE direction indicates neither, but later re-negotiation may make an extension active.
    
    Returns:
    
    the direction that the corresponding MediaDevice supports for this extension.
  - getURI
```
public URI getURI()
```
    Returns the URI that identifies the format and meaning of this extension.
    
    Returns:
    
    the URI (possibly a URN) that identifies the format and meaning of this extension.
  - getExtensionAttributes
```
public String getExtensionAttributes()
```
    Returns the extension attributes associated with this RTPExtension or null if this extension does not have any.
    
    Returns:
    
    A String containing the extension attributes associated with this RTPExtension or null if this extension does not have any.
  - toString
```
public String toString()
```
    Returns a String representation of this RTPExtension's URI.
    
    Overrides:
    
    toString in class Object
    
    Returns:
    
    a String representation of this RTPExtension's URI.
  - equals
```
public boolean equals(Object o)
```
    Returns true if and only if o is an instance of RTPExtension and o's URI is equal to this extension's URI. The method returns false otherwise.
    
    Overrides:
    
    equals in class Object
    
    Parameters:
    
    o - the Object that we'd like to compare to this RTPExtension.
    
    Returns:
    
    true when o's URI is equal to this extension's URI and false otherwise.
  - hashCode
```
public int hashCode()
```
    Returns the hash code of this extension instance which is actually the hash code of the URI that this extension is encapsulating.
    
    Overrides:
    
    hashCode in class Object
    
    Returns:
    
    the hash code of this extension instance which is actually the hash code of the URI that this extension is encapsulating.

Class RTPExtension

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

CSRC_AUDIO_LEVEL_URN

SSRC_AUDIO_LEVEL_URN

ABS_SEND_TIME_URN

FRAME_MARKING_URN

ORIGINAL_HEADER_BLOCK_URN

TRANSPORT_CC_URN

RTP_STREAM_ID_URN

TOF_URN

VIDEO_CONTENT_TYPE_URN

Constructor Detail

RTPExtension

RTPExtension

RTPExtension

RTPExtension

Method Detail

getDirection

getURI

getExtensionAttributes

toString

equals

hashCode