voip/java/android/net/sip/SdpSessionDescription.java - platform/frameworks/base - Git at Google

 /*
  * Copyright (C) 2010 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 package android.net.sip;

 import gov.nist.javax.sdp.SessionDescriptionImpl;
 import gov.nist.javax.sdp.fields.AttributeField;
 import gov.nist.javax.sdp.fields.ConnectionField;
 import gov.nist.javax.sdp.fields.MediaField;
 import gov.nist.javax.sdp.fields.OriginField;
 import gov.nist.javax.sdp.fields.ProtoVersionField;
 import gov.nist.javax.sdp.fields.SessionNameField;
 import gov.nist.javax.sdp.fields.TimeField;
 import gov.nist.javax.sdp.parser.SDPAnnounceParser;

 import android.util.Log;

 import java.text.ParseException;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 import java.util.Vector;
 import javax.sdp.Connection;
 import javax.sdp.MediaDescription;
 import javax.sdp.SdpException;

 /**
  * A session description that follows SDP (Session Description Protocol).
  * Refer to <a href="http://tools.ietf.org/html/rfc4566">RFC 4566</a>.
  * @hide
  */
 public class SdpSessionDescription extends SessionDescription {
     private static final String TAG = "SDP";
     private static final String AUDIO = "audio";
     private static final String RTPMAP = "rtpmap";
     private static final String PTIME = "ptime";
     private static final String SENDONLY = "sendonly";
     private static final String RECVONLY = "recvonly";
     private static final String INACTIVE = "inactive";

     private SessionDescriptionImpl mSessionDescription;

     /**
      * The audio codec information parsed from "rtpmap".
      */
     public static class AudioCodec {
         public final int payloadType;
         public final String name;
         public final int sampleRate;
         public final int sampleCount;

         public AudioCodec(int payloadType, String name, int sampleRate,
                 int sampleCount) {
             this.payloadType = payloadType;
             this.name = name;
             this.sampleRate = sampleRate;
             this.sampleCount = sampleCount;
         }
     }

     /**
      * The builder class used to create an {@link SdpSessionDescription} object.
      */
     public static class Builder {
         private SdpSessionDescription mSdp = new SdpSessionDescription();
         private SessionDescriptionImpl mSessionDescription;

         public Builder(String sessionName) throws SdpException {
             mSessionDescription = new SessionDescriptionImpl();
             mSdp.mSessionDescription = mSessionDescription;
             try {
                 ProtoVersionField proto = new ProtoVersionField();
                 proto.setVersion(0);
                 mSessionDescription.addField(proto);

                 TimeField time = new TimeField();
                 time.setZero();
                 mSessionDescription.addField(time);

                 SessionNameField session = new SessionNameField();
                 session.setValue(sessionName);
                 mSessionDescription.addField(session);
             } catch (Exception e) {
                 throwSdpException(e);
             }
         }

         public Builder setConnectionInfo(String networkType, String addressType,
                 String addr) throws SdpException {
             try {
                 ConnectionField connection = new ConnectionField();
                 connection.setNetworkType(networkType);
                 connection.setAddressType(addressType);
                 connection.setAddress(addr);
                 mSessionDescription.addField(connection);
             } catch (Exception e) {
                 throwSdpException(e);
             }
             return this;
         }

         public Builder setOrigin(SipProfile user, long sessionId,
                 long sessionVersion, String networkType, String addressType,
                 String address) throws SdpException {
             try {
                 OriginField origin = new OriginField();
                 origin.setUsername(user.getUserName());
                 origin.setSessionId(sessionId);
                 origin.setSessionVersion(sessionVersion);
                 origin.setAddressType(addressType);
                 origin.setNetworkType(networkType);
                 origin.setAddress(address);
                 mSessionDescription.addField(origin);
             } catch (Exception e) {
                 throwSdpException(e);
             }
             return this;
         }

         public Builder addMedia(String media, int port, int numPorts,
                 String transport, Integer... types) throws SdpException {
             MediaField field = new MediaField();
             Vector<Integer> typeVector = new Vector<Integer>();
             Collections.addAll(typeVector, types);
             try {
                 field.setMediaType(media);
                 field.setMediaPort(port);
                 field.setPortCount(numPorts);
                 field.setProtocol(transport);
                 field.setMediaFormats(typeVector);
                 mSessionDescription.addField(field);
             } catch (Exception e) {
                 throwSdpException(e);
             }
            return this;
         }

         public Builder addMediaAttribute(String type, String name, String value)
                 throws SdpException {
             try {
                 MediaDescription md = mSdp.getMediaDescription(type);
                 if (md == null) {
                     throw new SdpException("Should add media first!");
                 }
                 AttributeField attribute = new AttributeField();
                 attribute.setName(name);
                 attribute.setValueAllowNull(value);
                 mSessionDescription.addField(attribute);
             } catch (Exception e) {
                 throwSdpException(e);
             }
             return this;
         }

         public Builder addSessionAttribute(String name, String value)
                 throws SdpException {
             try {
                 AttributeField attribute = new AttributeField();
                 attribute.setName(name);
                 attribute.setValueAllowNull(value);
                 mSessionDescription.addField(attribute);
             } catch (Exception e) {
                 throwSdpException(e);
             }
             return this;
         }

         private void throwSdpException(Exception e) throws SdpException {
             if (e instanceof SdpException) {
                 throw (SdpException) e;
             } else {
                 throw new SdpException(e.toString(), e);
             }
         }

         public String build() {
             return mSdp.toString();
         }
     }

     private SdpSessionDescription() {
     }

     /**
      * Constructor.
      *
      * @param sdpString an SDP session description to parse
      */
     public SdpSessionDescription(String sdpString) throws SdpException {
         try {
             mSessionDescription = new SDPAnnounceParser(sdpString).parse();
         } catch (ParseException e) {
             throw new SdpException(e.toString(), e);
         }
         verify();
     }

     /**
      * Constructor.
      *
      * @param content a raw SDP session description to parse
      */
     public SdpSessionDescription(byte[] content) throws SdpException {
         this(new String(content));
     }

     private void verify() throws SdpException {
         // make sure the syntax is correct over the fields we're interested in
         Vector<MediaDescription> descriptions = (Vector<MediaDescription>)
                 mSessionDescription.getMediaDescriptions(false);
         for (MediaDescription md : descriptions) {
             md.getMedia().getMediaPort();
             Connection connection = md.getConnection();
             if (connection != null) connection.getAddress();
             md.getMedia().getFormats();
         }
         Connection connection = mSessionDescription.getConnection();
         if (connection != null) connection.getAddress();
     }

     /**
      * Gets the connection address of the media.
      *
      * @param type the media type; e.g., "AUDIO"
      * @return the media connection address of the peer
      */
     public String getPeerMediaAddress(String type) {
         try {
             MediaDescription md = getMediaDescription(type);
             Connection connection = md.getConnection();
             if (connection == null) {
                 connection = mSessionDescription.getConnection();
             }
             return ((connection == null) ? null : connection.getAddress());
         } catch (SdpException e) {
             // should not occur
             return null;
         }
     }

     /**
      * Gets the connection port number of the media.
      *
      * @param type the media type; e.g., "AUDIO"
      * @return the media connection port number of the peer
      */
     public int getPeerMediaPort(String type) {
         try {
             MediaDescription md = getMediaDescription(type);
             return md.getMedia().getMediaPort();
         } catch (SdpException e) {
             // should not occur
             return -1;
         }
     }

     private boolean containsAttribute(String type, String name) {
         if (name == null) return false;
         MediaDescription md = getMediaDescription(type);
         Vector<AttributeField> v = (Vector<AttributeField>)
                 md.getAttributeFields();
         for (AttributeField field : v) {
             if (name.equals(field.getAttribute().getName())) return true;
         }
         return false;
     }

     /**
      * Checks if the media is "sendonly".
      *
      * @param type the media type; e.g., "AUDIO"
      * @return true if the media is "sendonly"
      */
     public boolean isSendOnly(String type) {
         boolean answer = containsAttribute(type, SENDONLY);
         Log.d(TAG, "   sendonly? " + answer);
         return answer;
     }

     /**
      * Checks if the media is "recvonly".
      *
      * @param type the media type; e.g., "AUDIO"
      * @return true if the media is "recvonly"
      */
     public boolean isReceiveOnly(String type) {
         boolean answer = containsAttribute(type, RECVONLY);
         Log.d(TAG, "   recvonly? " + answer);
         return answer;
     }

     /**
      * Checks if the media is in sending; i.e., not "recvonly" and not
      * "inactive".
      *
      * @param type the media type; e.g., "AUDIO"
      * @return true if the media is sending
      */
     public boolean isSending(String type) {
         boolean answer = !containsAttribute(type, RECVONLY)
                 && !containsAttribute(type, INACTIVE);

         Log.d(TAG, "   sending? " + answer);
         return answer;
     }

     /**
      * Checks if the media is in receiving; i.e., not "sendonly" and not
      * "inactive".
      *
      * @param type the media type; e.g., "AUDIO"
      * @return true if the media is receiving
      */
     public boolean isReceiving(String type) {
         boolean answer = !containsAttribute(type, SENDONLY)
                 && !containsAttribute(type, INACTIVE);
         Log.d(TAG, "   receiving? " + answer);
         return answer;
     }

     private AudioCodec parseAudioCodec(String rtpmap, int ptime) {
         String[] ss = rtpmap.split(" ");
         int payloadType = Integer.parseInt(ss[0]);

         ss = ss[1].split("/");
         String name = ss[0];
         int sampleRate = Integer.parseInt(ss[1]);
         int channelCount = 1;
         if (ss.length > 2) channelCount = Integer.parseInt(ss[2]);
         int sampleCount = sampleRate / (1000 / ptime) * channelCount;
         return new AudioCodec(payloadType, name, sampleRate, sampleCount);
     }

     /**
      * Gets the list of audio codecs in this session description.
      *
      * @return the list of audio codecs in this session description
      */
     public List<AudioCodec> getAudioCodecs() {
         MediaDescription md = getMediaDescription(AUDIO);
         if (md == null) return new ArrayList<AudioCodec>();

         // FIXME: what happens if ptime is missing
         int ptime = 20;
         try {
             String value = md.getAttribute(PTIME);
             if (value != null) ptime = Integer.parseInt(value);
         } catch (Throwable t) {
             Log.w(TAG, "getCodecs(): ignored: " + t);
         }

         List<AudioCodec> codecs = new ArrayList<AudioCodec>();
         Vector<AttributeField> v = (Vector<AttributeField>)
                 md.getAttributeFields();
         for (AttributeField field : v) {
             try {
                 if (RTPMAP.equals(field.getName())) {
                     AudioCodec codec = parseAudioCodec(field.getValue(), ptime);
                     if (codec != null) codecs.add(codec);
                 }
             } catch (Throwable t) {
                 Log.w(TAG, "getCodecs(): ignored: " + t);
             }
         }
         return codecs;
     }

     /**
      * Gets the media description of the specified type.
      *
      * @param type the media type; e.g., "AUDIO"
      * @return the media description of the specified type
      */
     public MediaDescription getMediaDescription(String type) {
         MediaDescription[] all = getMediaDescriptions();
         if ((all == null) || (all.length == 0)) return null;
         for (MediaDescription md : all) {
             String t = md.getMedia().getMedia();
             if (t.equalsIgnoreCase(type)) return md;
         }
         return null;
     }

     /**
      * Gets all the media descriptions in this session description.
      *
      * @return all the media descriptions in this session description
      */
     public MediaDescription[] getMediaDescriptions() {
         try {
             Vector<MediaDescription> descriptions = (Vector<MediaDescription>)
                     mSessionDescription.getMediaDescriptions(false);
             MediaDescription[] all = new MediaDescription[descriptions.size()];
             return descriptions.toArray(all);
         } catch (SdpException e) {
             Log.e(TAG, "getMediaDescriptions", e);
         }
         return null;
     }

     @Override
     public String getType() {
         return "sdp";
     }

     @Override
     public byte[] getContent() {
           return mSessionDescription.toString().getBytes();
     }

     @Override
     public String toString() {
         return mSessionDescription.toString();
     }
 }
	/*
	* Copyright (C) 2010 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	package android.net.sip;

	import gov.nist.javax.sdp.SessionDescriptionImpl;
	import gov.nist.javax.sdp.fields.AttributeField;
	import gov.nist.javax.sdp.fields.ConnectionField;
	import gov.nist.javax.sdp.fields.MediaField;
	import gov.nist.javax.sdp.fields.OriginField;
	import gov.nist.javax.sdp.fields.ProtoVersionField;
	import gov.nist.javax.sdp.fields.SessionNameField;
	import gov.nist.javax.sdp.fields.TimeField;
	import gov.nist.javax.sdp.parser.SDPAnnounceParser;

	import android.util.Log;

	import java.text.ParseException;
	import java.util.ArrayList;
	import java.util.Collections;
	import java.util.List;
	import java.util.Vector;
	import javax.sdp.Connection;
	import javax.sdp.MediaDescription;
	import javax.sdp.SdpException;

	/**
	* A session description that follows SDP (Session Description Protocol).
	* Refer to <a href="http://tools.ietf.org/html/rfc4566">RFC 4566</a>.
	* @hide
	*/
	public class SdpSessionDescription extends SessionDescription {
	private static final String TAG = "SDP";
	private static final String AUDIO = "audio";
	private static final String RTPMAP = "rtpmap";
	private static final String PTIME = "ptime";
	private static final String SENDONLY = "sendonly";
	private static final String RECVONLY = "recvonly";
	private static final String INACTIVE = "inactive";

	private SessionDescriptionImpl mSessionDescription;

	/**
	* The audio codec information parsed from "rtpmap".
	*/
	public static class AudioCodec {
	public final int payloadType;
	public final String name;
	public final int sampleRate;
	public final int sampleCount;

	public AudioCodec(int payloadType, String name, int sampleRate,
	int sampleCount) {
	this.payloadType = payloadType;
	this.name = name;
	this.sampleRate = sampleRate;
	this.sampleCount = sampleCount;
	}
	}

	/**
	* The builder class used to create an {@link SdpSessionDescription} object.
	*/
	public static class Builder {
	private SdpSessionDescription mSdp = new SdpSessionDescription();
	private SessionDescriptionImpl mSessionDescription;

	public Builder(String sessionName) throws SdpException {
	mSessionDescription = new SessionDescriptionImpl();
	mSdp.mSessionDescription = mSessionDescription;
	try {
	ProtoVersionField proto = new ProtoVersionField();
	proto.setVersion(0);
	mSessionDescription.addField(proto);

	TimeField time = new TimeField();
	time.setZero();
	mSessionDescription.addField(time);

	SessionNameField session = new SessionNameField();
	session.setValue(sessionName);
	mSessionDescription.addField(session);
	} catch (Exception e) {
	throwSdpException(e);
	}
	}

	public Builder setConnectionInfo(String networkType, String addressType,
	String addr) throws SdpException {
	try {
	ConnectionField connection = new ConnectionField();
	connection.setNetworkType(networkType);
	connection.setAddressType(addressType);
	connection.setAddress(addr);
	mSessionDescription.addField(connection);
	} catch (Exception e) {
	throwSdpException(e);
	}
	return this;
	}

	public Builder setOrigin(SipProfile user, long sessionId,
	long sessionVersion, String networkType, String addressType,
	String address) throws SdpException {
	try {
	OriginField origin = new OriginField();
	origin.setUsername(user.getUserName());
	origin.setSessionId(sessionId);
	origin.setSessionVersion(sessionVersion);
	origin.setAddressType(addressType);
	origin.setNetworkType(networkType);
	origin.setAddress(address);
	mSessionDescription.addField(origin);
	} catch (Exception e) {
	throwSdpException(e);
	}
	return this;
	}

	public Builder addMedia(String media, int port, int numPorts,
	String transport, Integer... types) throws SdpException {
	MediaField field = new MediaField();
	Vector<Integer> typeVector = new Vector<Integer>();
	Collections.addAll(typeVector, types);
	try {
	field.setMediaType(media);
	field.setMediaPort(port);
	field.setPortCount(numPorts);
	field.setProtocol(transport);
	field.setMediaFormats(typeVector);
	mSessionDescription.addField(field);
	} catch (Exception e) {
	throwSdpException(e);
	}
	return this;
	}

	public Builder addMediaAttribute(String type, String name, String value)
	throws SdpException {
	try {
	MediaDescription md = mSdp.getMediaDescription(type);
	if (md == null) {
	throw new SdpException("Should add media first!");
	}
	AttributeField attribute = new AttributeField();
	attribute.setName(name);
	attribute.setValueAllowNull(value);
	mSessionDescription.addField(attribute);
	} catch (Exception e) {
	throwSdpException(e);
	}
	return this;
	}

	public Builder addSessionAttribute(String name, String value)
	throws SdpException {
	try {
	AttributeField attribute = new AttributeField();
	attribute.setName(name);
	attribute.setValueAllowNull(value);
	mSessionDescription.addField(attribute);
	} catch (Exception e) {
	throwSdpException(e);
	}
	return this;
	}

	private void throwSdpException(Exception e) throws SdpException {
	if (e instanceof SdpException) {
	throw (SdpException) e;
	} else {
	throw new SdpException(e.toString(), e);
	}
	}

	public String build() {
	return mSdp.toString();
	}
	}

	private SdpSessionDescription() {
	}

	/**
	* Constructor.
	*
	* @param sdpString an SDP session description to parse
	*/
	public SdpSessionDescription(String sdpString) throws SdpException {
	try {
	mSessionDescription = new SDPAnnounceParser(sdpString).parse();
	} catch (ParseException e) {
	throw new SdpException(e.toString(), e);
	}
	verify();
	}

	/**
	* Constructor.
	*
	* @param content a raw SDP session description to parse
	*/
	public SdpSessionDescription(byte[] content) throws SdpException {
	this(new String(content));
	}

	private void verify() throws SdpException {
	// make sure the syntax is correct over the fields we're interested in
	Vector<MediaDescription> descriptions = (Vector<MediaDescription>)
	mSessionDescription.getMediaDescriptions(false);
	for (MediaDescription md : descriptions) {
	md.getMedia().getMediaPort();
	Connection connection = md.getConnection();
	if (connection != null) connection.getAddress();
	md.getMedia().getFormats();
	}
	Connection connection = mSessionDescription.getConnection();
	if (connection != null) connection.getAddress();
	}

	/**
	* Gets the connection address of the media.
	*
	* @param type the media type; e.g., "AUDIO"
	* @return the media connection address of the peer
	*/
	public String getPeerMediaAddress(String type) {
	try {
	MediaDescription md = getMediaDescription(type);
	Connection connection = md.getConnection();
	if (connection == null) {
	connection = mSessionDescription.getConnection();
	}
	return ((connection == null) ? null : connection.getAddress());
	} catch (SdpException e) {
	// should not occur
	return null;
	}
	}

	/**
	* Gets the connection port number of the media.
	*
	* @param type the media type; e.g., "AUDIO"
	* @return the media connection port number of the peer
	*/
	public int getPeerMediaPort(String type) {
	try {
	MediaDescription md = getMediaDescription(type);
	return md.getMedia().getMediaPort();
	} catch (SdpException e) {
	// should not occur
	return -1;
	}
	}

	private boolean containsAttribute(String type, String name) {
	if (name == null) return false;
	MediaDescription md = getMediaDescription(type);
	Vector<AttributeField> v = (Vector<AttributeField>)
	md.getAttributeFields();
	for (AttributeField field : v) {
	if (name.equals(field.getAttribute().getName())) return true;
	}
	return false;
	}

	/**
	* Checks if the media is "sendonly".
	*
	* @param type the media type; e.g., "AUDIO"
	* @return true if the media is "sendonly"
	*/
	public boolean isSendOnly(String type) {
	boolean answer = containsAttribute(type, SENDONLY);
	Log.d(TAG, " sendonly? " + answer);
	return answer;
	}

	/**
	* Checks if the media is "recvonly".
	*
	* @param type the media type; e.g., "AUDIO"
	* @return true if the media is "recvonly"
	*/
	public boolean isReceiveOnly(String type) {
	boolean answer = containsAttribute(type, RECVONLY);
	Log.d(TAG, " recvonly? " + answer);
	return answer;
	}

	/**
	* Checks if the media is in sending; i.e., not "recvonly" and not
	* "inactive".
	*
	* @param type the media type; e.g., "AUDIO"
	* @return true if the media is sending
	*/
	public boolean isSending(String type) {
	boolean answer = !containsAttribute(type, RECVONLY)
	&& !containsAttribute(type, INACTIVE);

	Log.d(TAG, " sending? " + answer);
	return answer;
	}

	/**
	* Checks if the media is in receiving; i.e., not "sendonly" and not
	* "inactive".
	*
	* @param type the media type; e.g., "AUDIO"
	* @return true if the media is receiving
	*/
	public boolean isReceiving(String type) {
	boolean answer = !containsAttribute(type, SENDONLY)
	&& !containsAttribute(type, INACTIVE);
	Log.d(TAG, " receiving? " + answer);
	return answer;
	}

	private AudioCodec parseAudioCodec(String rtpmap, int ptime) {
	String[] ss = rtpmap.split(" ");
	int payloadType = Integer.parseInt(ss[0]);

	ss = ss[1].split("/");
	String name = ss[0];
	int sampleRate = Integer.parseInt(ss[1]);
	int channelCount = 1;
	if (ss.length > 2) channelCount = Integer.parseInt(ss[2]);
	int sampleCount = sampleRate / (1000 / ptime) * channelCount;
	return new AudioCodec(payloadType, name, sampleRate, sampleCount);
	}

	/**
	* Gets the list of audio codecs in this session description.
	*
	* @return the list of audio codecs in this session description
	*/
	public List<AudioCodec> getAudioCodecs() {
	MediaDescription md = getMediaDescription(AUDIO);
	if (md == null) return new ArrayList<AudioCodec>();

	// FIXME: what happens if ptime is missing
	int ptime = 20;
	try {
	String value = md.getAttribute(PTIME);
	if (value != null) ptime = Integer.parseInt(value);
	} catch (Throwable t) {
	Log.w(TAG, "getCodecs(): ignored: " + t);
	}

	List<AudioCodec> codecs = new ArrayList<AudioCodec>();
	Vector<AttributeField> v = (Vector<AttributeField>)
	md.getAttributeFields();
	for (AttributeField field : v) {
	try {
	if (RTPMAP.equals(field.getName())) {
	AudioCodec codec = parseAudioCodec(field.getValue(), ptime);
	if (codec != null) codecs.add(codec);
	}
	} catch (Throwable t) {
	Log.w(TAG, "getCodecs(): ignored: " + t);
	}
	}
	return codecs;
	}

	/**
	* Gets the media description of the specified type.
	*
	* @param type the media type; e.g., "AUDIO"
	* @return the media description of the specified type
	*/
	public MediaDescription getMediaDescription(String type) {
	MediaDescription[] all = getMediaDescriptions();
	if ((all == null) \|\| (all.length == 0)) return null;
	for (MediaDescription md : all) {
	String t = md.getMedia().getMedia();
	if (t.equalsIgnoreCase(type)) return md;
	}
	return null;
	}

	/**
	* Gets all the media descriptions in this session description.
	*
	* @return all the media descriptions in this session description
	*/
	public MediaDescription[] getMediaDescriptions() {
	try {
	Vector<MediaDescription> descriptions = (Vector<MediaDescription>)
	mSessionDescription.getMediaDescriptions(false);
	MediaDescription[] all = new MediaDescription[descriptions.size()];
	return descriptions.toArray(all);
	} catch (SdpException e) {
	Log.e(TAG, "getMediaDescriptions", e);
	}
	return null;
	}

	@Override
	public String getType() {
	return "sdp";
	}

	@Override
	public byte[] getContent() {
	return mSessionDescription.toString().getBytes();
	}

	@Override
	public String toString() {
	return mSessionDescription.toString();
	}
	}