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  /*
   * MediaDescription.java
   *
   * Created on December 19, 2001, 11:17 AM
   */
  
  package javax.sdp;
  
  import java.io.*;
 import java.util.*;
 
 // issued by Miguel Freitas - work-around
 // end //
 

A MediaDescription identifies the set of medias that may be received on a specific port or set of ports. It includes: a mediaType (e.g., audio, video, etc.) a port number (or set of ports) a protocol to be used (e.g., RTP/AVP) a set of media formats which correspond to Attributes associated with the media description. The following is an example m=audio 60000 RTP/AVP 0 a=rtpmap:0 PCMU/8000 This example identifies that the client can receive audio on port 60000 in format 0 which corresponds to PCMU/8000. Please refer to IETF RFC 2327 for a description of SDP.

Author(s):
deruelle
Version:
1.0
 
 public interface MediaDescription extends SerializableCloneable {

Return the Media field of the description.

Returns:
the Media field of the description.
     
 public Media getMedia();

Set the Media field of the description.

Parameters:
media to set
Throws:
SdpException if the media field is null
 
 public void setMedia(Media media)
               throws SdpException;

Returns value of the info field (i=) of this object.

Returns:
value of the info field (i=) of this object.
 
 public Info getInfo();

Sets the i= field of this object.

Parameters:
i to set
Throws:
SdpException if the info is null
 
 public void setInfo(Info i)
              throws SdpException;

Returns the connection information associated with this object. This may be null for SessionDescriptions if all Media objects have a connection object and may be null for Media objects if the corresponding session connection is non-null.

Returns:
connection
 
Set the connection data for this entity

Parameters:
conn to set
Throws:
SdpException if the connexion is null
 
 public void setConnection(Connection conn)
                    throws SdpException;

Returns the Bandwidth of the specified type.

Parameters:
create type of the Bandwidth to return
Returns:
the Bandwidth or null if undefined
 
 public Vector getBandwidths(boolean create);

set the value of the Bandwidth with the specified type

Parameters:
bandwidths type of the Bandwidth object whose value is requested
Throws:
SdpException if vector is null
 
 public void setBandwidths(Vector bandwidths)
                    throws SdpException;

Returns the integer value of the specified bandwidth name.

Parameters:
name the name of the bandwidth type.
Returns:
the value of the named bandwidth
Throws:
SdpParseException
 
 public int getBandwidth(String name)
                  throws SdpParseException;

Sets the value of the specified bandwidth type.

Parameters:
name the name of the bandwidth type.
value the value of the named bandwidth type.
Throws:
SdpException if the name is null
public void setBandwidth(String name,
                         int value)
                  throws SdpException;

Removes the specified bandwidth type.

Parameters:
name the name of the bandwidth type.
public void removeBandwidth(String name);

Returns the key data.

Returns:
the key data.
public Key getKey();

Sets encryption key information. This consists of a method and an encryption key included inline.

Parameters:
key the encryption key data; depending on method may be null
Throws:
SdpException if the key is null
public void setKey(Key key)
            throws SdpException;

Returns the set of attributes for this Description as a Vector of Attribute objects in the order they were parsed.

Parameters:
create specifies whether to return null or a new empty Vector in case no attributes exists for this Description
Returns:
attributes for this Description
public Vector getAttributes(boolean create);

Adds the specified Attribute to this Description object.

Parameters:
Attributes the attribute to add
Throws:
SdpException if the attribute is null
public void setAttributes(Vector Attributes)
                   throws SdpException;

Returns the value of the specified attribute.

Parameters:
name the name of the attribute.
Returns:
the value of the named attribute
Throws:
SdpParseException
public String getAttribute(String name)
                    throws SdpParseException;

Sets the value of the specified attribute

Parameters:
name the name of the attribute.
value the value of the named attribute.
Throws:
SdpException if the parameters are null
public void setAttribute(String name,
                         String value)
                  throws SdpException;

Removes the attribute specified by the value parameter.

Parameters:
name the name of the attribute.
public void removeAttribute(String name);

Returns a Vector containing a string indicating the MIME type for each of the codecs in this description. A MIME value is computed for each codec in the media description. The MIME type is computed in the following fashion: The type is the mediaType from the media field. The subType is determined by the protocol. The result is computed as the string of the form: type + '/' + subType The subType portion is computed in the following fashion. RTP/AVP the subType is returned as the codec name. This will either be extracted from the rtpmap attribute or computed. other the protocol is returned as the subType. If the protocol is RTP/AVP and the rtpmap attribute for a codec is absent, then the codec name will be computed in the following fashion. String indexed in table SdpConstants.avpTypeNames if the value is an int greater than or equal to 0 and less than AVP_DEFINED_STATIC_MAX, and has been assigned a value. SdpConstant.RESERVED if the value is an int greater than or equal to 0 and less than AVP_DEFINED_STATIC_MAX, and has not been assigned a value. SdpConstant.UNASSIGNED An int greater than or equal to AVP_DEFINED_STATIC_MAX and less than AVP_DYNAMIC_MIN - currently unassigned. SdpConstant.DYNAMIC Any int less than 0 or greater than or equal to AVP_DYNAMIC_MIN

Returns:
a Vector containing a string indicating the MIME type for each of the codecs in this description
Throws:
SdpException if there is a problem extracting the parameters.
                    throws SdpException;

Returns a Vector containing a string of parameters for each of the codecs in this description. A parameter string is computed for each codec. The parameter string is computed in the following fashion. The rate is extracted from the rtpmap or static data. The number of channels is extracted from the rtpmap or static data. The ptime is extracted from the ptime attribute. The maxptime is extracted from the maxptime attribute. Any additional parameters are extracted from the ftmp attribute.

Returns:
a Vector containing a string of parameters for each of the codecs in this description.
Throws:
SdpException if there is a problem extracting the parameters.
                         throws SdpException;

Adds dynamic media types to the description.

Parameters:
payloadNames a Vector of String - each one the name of a dynamic payload to be added (usually an integer larger than SdpConstants.AVP_DYNAMIC_MIN).
payloadValues a Vector of String - each contains the value describing the correlated dynamic payloads to be added
Throws:
SdpException if either vector is null or empty. if the vector sizes are unequal.
public void addDynamicPayloads(Vector payloadNames,
                               Vector payloadValues)
                        throws SdpException;
//////////////////////////////////////////////
// changes made by PT-INOVACAO
//////////////////////////////////////////////

Set PreconditionFields for the Media Description

issued by Miguel Freitas (IT) PTInovacao

Parameters:
segPrecondition Vector with values to ser
Throws:
SdpException
public void setPreconditionFields(Vector segPreconditionthrows SdpException;

Set PreconditionFields for the Media Description

issued by Miguel Freitas (IT) PTInovacao

Parameters:
segPrecondition PreconditionFields with values to set
public void setPreconditions(PreconditionFields segPrecondition);

Get all Precondition Fields in the Media Descritpion

issued by Miguel Freitas (IT) PTInovacao

Returns:
Vector precondition fields

Add Media Attribute based on an AttributeField value

issued by Miguel Freitas (IT) PTInovacao

Parameters:
at AttributeField
public void addAttribute(AttributeField at);
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