package eu.siacs.conversations.xmpp.jingle; import android.util.Log; import android.util.Pair; import com.google.common.base.Joiner; import com.google.common.base.Strings; import com.google.common.collect.ArrayListMultimap; import com.google.common.collect.ImmutableList; import java.util.List; import java.util.Locale; import java.util.Map; import eu.siacs.conversations.Config; import eu.siacs.conversations.xmpp.jingle.stanzas.Group; import eu.siacs.conversations.xmpp.jingle.stanzas.IceUdpTransportInfo; import eu.siacs.conversations.xmpp.jingle.stanzas.RtpDescription; public class SessionDescription { private final static String LINE_DIVIDER = "\r\n"; private final static String HARDCODED_MEDIA_PROTOCOL = "UDP/TLS/RTP/SAVPF"; //probably only true for DTLS-SRTP aka when we have a fingerprint private final static int HARDCODED_MEDIA_PORT = 1; private final static String HARDCODED_ICE_OPTIONS = "trickle renomination"; private final static String HARDCODED_CONNECTION = "IN IP4 0.0.0.0"; public final int version; public final String name; public final String connectionData; public final ArrayListMultimap attributes; public final List media; public SessionDescription(int version, String name, String connectionData, ArrayListMultimap attributes, List media) { this.version = version; this.name = name; this.connectionData = connectionData; this.attributes = attributes; this.media = media; } private static void appendAttributes(StringBuilder s, ArrayListMultimap attributes) { for (Map.Entry attribute : attributes.entries()) { final String key = attribute.getKey(); final String value = attribute.getValue(); s.append("a=").append(key); if (!Strings.isNullOrEmpty(value)) { s.append(':').append(value); } s.append(LINE_DIVIDER); } } public static SessionDescription parse(final Map contents) { final SessionDescriptionBuilder sessionDescriptionBuilder = new SessionDescriptionBuilder(); return sessionDescriptionBuilder.createSessionDescription(); } public static SessionDescription parse(final String input) { final SessionDescriptionBuilder sessionDescriptionBuilder = new SessionDescriptionBuilder(); MediaBuilder currentMediaBuilder = null; ArrayListMultimap attributeMap = ArrayListMultimap.create(); ImmutableList.Builder mediaBuilder = new ImmutableList.Builder<>(); for (final String line : input.split(LINE_DIVIDER)) { final String[] pair = line.trim().split("=", 2); if (pair.length < 2 || pair[0].length() != 1) { Log.d(Config.LOGTAG, "skipping sdp parsing on line " + line); continue; } final char key = pair[0].charAt(0); final String value = pair[1]; switch (key) { case 'v': sessionDescriptionBuilder.setVersion(ignorantIntParser(value)); break; case 'c': if (currentMediaBuilder != null) { currentMediaBuilder.setConnectionData(value); } else { sessionDescriptionBuilder.setConnectionData(value); } break; case 's': sessionDescriptionBuilder.setName(value); break; case 'a': final Pair attribute = parseAttribute(value); attributeMap.put(attribute.first, attribute.second); break; case 'm': if (currentMediaBuilder == null) { sessionDescriptionBuilder.setAttributes(attributeMap); ; } else { currentMediaBuilder.setAttributes(attributeMap); mediaBuilder.add(currentMediaBuilder.createMedia()); } attributeMap = ArrayListMultimap.create(); currentMediaBuilder = new MediaBuilder(); final String[] parts = value.split(" "); if (parts.length >= 3) { currentMediaBuilder.setMedia(parts[0]); currentMediaBuilder.setPort(ignorantIntParser(parts[1])); currentMediaBuilder.setProtocol(parts[2]); ImmutableList.Builder formats = new ImmutableList.Builder<>(); for (int i = 3; i < parts.length; ++i) { formats.add(ignorantIntParser(parts[i])); } currentMediaBuilder.setFormats(formats.build()); } else { Log.d(Config.LOGTAG, "skipping media line " + line); } break; } } if (currentMediaBuilder != null) { currentMediaBuilder.setAttributes(attributeMap); mediaBuilder.add(currentMediaBuilder.createMedia()); } sessionDescriptionBuilder.setMedia(mediaBuilder.build()); return sessionDescriptionBuilder.createSessionDescription(); } public static SessionDescription of(final RtpContentMap contentMap) { final SessionDescriptionBuilder sessionDescriptionBuilder = new SessionDescriptionBuilder(); final ArrayListMultimap attributeMap = ArrayListMultimap.create(); final ImmutableList.Builder mediaListBuilder = new ImmutableList.Builder<>(); final Group group = contentMap.group; if (group != null) { attributeMap.put("group", group.getSemantics() + " " + Joiner.on(' ').join(group.getIdentificationTags())); } //random additional attributes for (Map.Entry entry : contentMap.contents.entrySet()) { final String name = entry.getKey(); RtpContentMap.DescriptionTransport descriptionTransport = entry.getValue(); RtpDescription description = descriptionTransport.description; IceUdpTransportInfo transport = descriptionTransport.transport; final ArrayListMultimap mediaAttributes = ArrayListMultimap.create(); final String ufrag = transport.getAttribute("ufrag"); final String pwd = transport.getAttribute("pwd"); if (!Strings.isNullOrEmpty(ufrag)) { mediaAttributes.put("ice-ufrag", ufrag); } if (!Strings.isNullOrEmpty(pwd)) { mediaAttributes.put("ice-pwd", pwd); } mediaAttributes.put("ice-options", HARDCODED_ICE_OPTIONS); final IceUdpTransportInfo.Fingerprint fingerprint = transport.getFingerprint(); if (fingerprint != null) { mediaAttributes.put("fingerprint", fingerprint.getHash() + " " + fingerprint.getContent()); mediaAttributes.put("setup", fingerprint.getSetup()); } final ImmutableList.Builder formatBuilder = new ImmutableList.Builder<>(); for (RtpDescription.PayloadType payloadType : description.getPayloadTypes()) { formatBuilder.add(payloadType.getIntId()); mediaAttributes.put("rtpmap", payloadType.toSdpAttribute()); List parameters = payloadType.getParameters(); if (parameters.size() > 0) { mediaAttributes.put("fmtp", RtpDescription.Parameter.toSdpString(payloadType.getId(), parameters)); } for (RtpDescription.FeedbackNegotiation feedbackNegotiation : payloadType.getFeedbackNegotiations()) { mediaAttributes.put("rtcp-fb", payloadType.getId() + " " + feedbackNegotiation.getType() + (Strings.isNullOrEmpty(feedbackNegotiation.getSubType()) ? "" : " " + feedbackNegotiation.getSubType())); } for (RtpDescription.FeedbackNegotiationTrrInt feedbackNegotiationTrrInt : payloadType.feedbackNegotiationTrrInts()) { mediaAttributes.put("rtcp-fb", payloadType.getId() + " trr-int " + feedbackNegotiationTrrInt.getValue()); } } for (RtpDescription.FeedbackNegotiation feedbackNegotiation : description.getFeedbackNegotiations()) { mediaAttributes.put("rtcp-fb", "* " + feedbackNegotiation.getType() + (Strings.isNullOrEmpty(feedbackNegotiation.getSubType()) ? "" : " " + feedbackNegotiation.getSubType())); } for (RtpDescription.FeedbackNegotiationTrrInt feedbackNegotiationTrrInt : description.feedbackNegotiationTrrInts()) { mediaAttributes.put("rtcp-fb", "* trr-int " + feedbackNegotiationTrrInt.getValue()); } for (RtpDescription.RtpHeaderExtension extension : description.getHeaderExtensions()) { mediaAttributes.put("extmap", extension.getId() + " " + extension.getUri()); } mediaAttributes.put("mid", name); //random additional attributes mediaAttributes.put("sendrecv",""); mediaAttributes.put("rtcp-mux",""); final MediaBuilder mediaBuilder = new MediaBuilder(); mediaBuilder.setMedia(description.getMedia().toString().toLowerCase(Locale.ROOT)); mediaBuilder.setConnectionData(HARDCODED_CONNECTION); mediaBuilder.setPort(HARDCODED_MEDIA_PORT); mediaBuilder.setProtocol(HARDCODED_MEDIA_PROTOCOL); mediaBuilder.setAttributes(mediaAttributes); mediaBuilder.setFormats(formatBuilder.build()); mediaListBuilder.add(mediaBuilder.createMedia()); } sessionDescriptionBuilder.setVersion(0); sessionDescriptionBuilder.setName(" "); sessionDescriptionBuilder.setMedia(mediaListBuilder.build()); sessionDescriptionBuilder.setAttributes(attributeMap); return sessionDescriptionBuilder.createSessionDescription(); } public static int ignorantIntParser(final String input) { try { return Integer.parseInt(input); } catch (NumberFormatException e) { return 0; } } public static Pair parseAttribute(final String input) { final String[] pair = input.split(":", 2); if (pair.length == 2) { return new Pair<>(pair[0], pair[1]); } else { return new Pair<>(pair[0], ""); } } @Override public String toString() { final StringBuilder s = new StringBuilder() .append("v=").append(version).append(LINE_DIVIDER) .append("s=").append(name).append(LINE_DIVIDER); appendAttributes(s, attributes); for (Media media : this.media) { s.append("m=").append(media.media).append(' ').append(media.port).append(' ').append(media.protocol).append(' ').append(Joiner.on(' ').join(media.formats)).append(LINE_DIVIDER); s.append("c=").append(media.connectionData).append(LINE_DIVIDER); appendAttributes(s, media.attributes); } return s.toString(); } public static class Media { public final String media; public final int port; public final String protocol; public final List formats; public final String connectionData; public final ArrayListMultimap attributes; public Media(String media, int port, String protocol, List formats, String connectionData, ArrayListMultimap attributes) { this.media = media; this.port = port; this.protocol = protocol; this.formats = formats; this.connectionData = connectionData; this.attributes = attributes; } } }