//readonly SctpParameters _sctpParameters;
//readonly PlainRtpParameters _plainRtpParameters;
//readonly Mid _mid;
//readonly MediaKind _kind;
//RtpParameters
public OfferMediaSection(
IceParameters iceParameters,
IceCandidate[] iceCandidates,
DtlsParameters dtlsParameters,
SctpParameters sctpParameters,
PlainRtpParameters plainRtpParameters,
bool planB,
Mid mid,
MediaKind kind,
RtpParameters offerRtpParameters,
string streamId,
string trackId,
bool oldDataChannelSpec) : base(iceParameters, iceCandidates, dtlsParameters, planB)
{
_mediaObject.MediaDescription.Attributes.Mid = mid;
_mediaObject.MediaDescription.Media = kind.ToSdp();
if (plainRtpParameters is null)
{
_mediaObject.MediaDescription.ConnectionData = new ConnectionData
{
NetType = NetType.Internet,
AddrType = AddrType.Ip4,
ConnectionAddress = "127.0.0.1"
};
if (sctpParameters is null)
{
_mediaObject.MediaDescription.Proto = "UDP/TLS/RTP/SAVPF";
}
else
{
_mediaObject.MediaDescription.Proto = "UDP/DTLS/SCTP";
}
_mediaObject.MediaDescription.Port = 7;
}
else
{
_mediaObject.MediaDescription.ConnectionData = new ConnectionData
{
NetType = NetType.Internet,
AddrType = plainRtpParameters.IpVersion,
ConnectionAddress = plainRtpParameters.Ip
};
_mediaObject.MediaDescription.Proto = "RTP/AVP";
_mediaObject.MediaDescription.Port = plainRtpParameters.Port;
}
switch (kind)
{
case MediaKind.Audio:
case MediaKind.Video:
{
_mediaObject.MediaDescription.Attributes.SendOnly = true;
_mediaObject.MediaDescription.Attributes.Rtpmaps = new List <Rtpmap>();
_mediaObject.MediaDescription.Attributes.RtcpFbs = new List <RtcpFb>();
_mediaObject.MediaDescription.Attributes.Fmtps = new List <Fmtp>();
if (!_planB)
{
_mediaObject.MediaDescription.Attributes.Msid = new()
{
Id = streamId ?? "-",
AppData = trackId
}
}
;
foreach (var codec in offerRtpParameters.Codecs)
{
Rtpmap rtpmap = new()
{
PayloadType = codec.PayloadType,
EncodingName = GetCodecName(codec),
ClockRate = codec.ClockRate,
Channels = codec.Channels > 1 ? codec.Channels : null
};
_mediaObject.MediaDescription.Attributes.Rtpmaps.Add(rtpmap);
Fmtp fmtp = codec.Parameters.ToFmtp(codec.PayloadType);
if (!string.IsNullOrEmpty(fmtp.Value))
{
_mediaObject.MediaDescription.Attributes.Fmtps.Add(fmtp);
}
foreach (var fb in codec.RtcpFeedback)
{
RtcpFb rtcpFb = new()
{
PayloadType = codec.PayloadType,
Type = fb.Type,
SubType = fb.Parameter
};
_mediaObject.MediaDescription.Attributes.RtcpFbs.Add(rtcpFb);
}
}
_mediaObject.MediaDescription.Fmts ??= new List <string>();
((List <string>)_mediaObject.MediaDescription.Fmts).AddRange(offerRtpParameters.Codecs
.Select(codec => codec.PayloadType.ToString()));
_mediaObject.MediaDescription.Attributes.Extmaps = new List <Extmap>();
foreach (var headerExtension in offerRtpParameters.HeaderExtensions)
{
Extmap ext = new()
{
Uri = new Uri(headerExtension.Uri),
Value = headerExtension.Id
};
_mediaObject.MediaDescription.Attributes.Extmaps.Add(ext);
}
_mediaObject.MediaDescription.Attributes.RtcpMux = true;
_mediaObject.MediaDescription.Attributes.RtcpRsize = true;
var encoding = offerRtpParameters.Encodings[0];
var ssrc = encoding.Ssrc;
var rtxSsrc = (encoding.Rtx is not null && encoding.Rtx.Ssrc.HasValue) ?
encoding.Rtx.Ssrc : null;
_mediaObject.MediaDescription.Attributes.Ssrcs = new List <Ssrc>();
_mediaObject.MediaDescription.Attributes.SsrcGroups = new List <SsrcGroup>();
if (offerRtpParameters.Rtcp.Cname is not null)
{
_mediaObject.MediaDescription.Attributes.Ssrcs.Add(new Ssrc
{
Id = (uint)ssrc,
Attribute = "cname",
Value = offerRtpParameters.Rtcp.Cname
});
}
if (_planB)
{
_mediaObject.MediaDescription.Attributes.Ssrcs.Add(new Ssrc
{
Id = (uint)ssrc,
Attribute = "msid",
Value = $"{streamId ?? "-"} {trackId}"
});
}
if (rtxSsrc.HasValue)
{
if (offerRtpParameters.Rtcp.Cname is not null)
{
_mediaObject.MediaDescription.Attributes.Ssrcs.Add(new Ssrc
{
Id = (uint)rtxSsrc,
Attribute = "cname",
Value = offerRtpParameters.Rtcp.Cname
});
}
if (_planB)
{
_mediaObject.MediaDescription.Attributes.Ssrcs.Add(new Ssrc
{
Id = (uint)rtxSsrc,
Attribute = "msid",
Value = $"{streamId ?? "-"} {trackId}"
});
}
// Associate original and retransmission SSRCs.
_mediaObject.MediaDescription.Attributes.SsrcGroups.Add(new SsrcGroup
{
Semantics = "FID",
SsrcIds = new string[] { $"{ssrc} {rtxSsrc}" }
});
}
break;
}
case MediaKind.Application:
{
// New spec.
if (!oldDataChannelSpec)
{
_mediaObject.MediaDescription.Fmts = new List <string> {
"webrtc-datachannel"
};
_mediaObject.MediaDescription.Attributes.SctpPort = new SctpPort
{
Port = sctpParameters.Port
};
_mediaObject.MediaDescription.Attributes.MaxMessageSize = new MaxMessageSize
{
Size = sctpParameters.MaxMessageSize
};
}
// Old spec.
else
{
_mediaObject.MediaDescription.Fmts = new List <string> {
sctpParameters.Port.ToString()
};
_mediaObject.SctpMap = new()
{
App = "webrtc-datachannel",
SctpMapNumber = sctpParameters.Port,
MaxMessageSize = sctpParameters.MaxMessageSize
};
}
break;
}
}
}
void PlanBReceive(RtpParameters offerRtpParameters, string streamId, IMediaStream trackId)
{
var encoding = offerRtpParameters.Encodings[0];
var ssrc = encoding.Ssrc;
var rtxSsrc = (encoding.Rtx is not null && encoding.Rtx.Ssrc.HasValue) ?
encoding.Rtx.Ssrc : null;
var payloads = _mediaObject.MediaDescription.Fmts.ToArray();
foreach (var codec in offerRtpParameters.Codecs)
{
if (payloads.Any(payload => payload.Contains(codec.PayloadType.ToString())))
{
continue;
}
Rtpmap rtpmap = new()
{
PayloadType = codec.PayloadType,
EncodingName = GetCodecName(codec),
ClockRate = codec.ClockRate,
Channels = codec.Channels > 1 ? codec.Channels : null
};
_mediaObject.MediaDescription.Attributes.Rtpmaps.Add(rtpmap);
Fmtp fmtp = codec.Parameters.ToFmtp(codec.PayloadType);
if (!string.IsNullOrEmpty(fmtp.Value))
{
_mediaObject.MediaDescription.Attributes.Fmtps.Add(fmtp);
}
foreach (var fb in codec.RtcpFeedback)
{
RtcpFb rtcpFb = new()
{
PayloadType = codec.PayloadType,
Type = fb.Type,
SubType = fb.Parameter
};
_mediaObject.MediaDescription.Attributes.RtcpFbs.Add(rtcpFb);
}
}
((List <string>)_mediaObject.MediaDescription.Fmts).AddRange(offerRtpParameters.Codecs
.Select(codec => codec.PayloadType.ToString()));
if (offerRtpParameters.Rtcp.Cname is not null)
{
_mediaObject.MediaDescription.Attributes.Ssrcs.Add(new Ssrc
{
Id = (uint)ssrc,
Attribute = "cname",
Value = offerRtpParameters.Rtcp.Cname
});
}
_mediaObject.MediaDescription.Attributes.Ssrcs.Add(new Ssrc
{
Id = (uint)ssrc,
Attribute = "msid",
Value = $"{streamId ?? "-"} {trackId}"
});
if (rtxSsrc.HasValue)
{
if (offerRtpParameters.Rtcp.Cname is not null)
{
_mediaObject.MediaDescription.Attributes.Ssrcs.Add(new Ssrc
{
Id = (uint)rtxSsrc,
Attribute = "cname",
Value = offerRtpParameters.Rtcp.Cname
});
}
_mediaObject.MediaDescription.Attributes.Ssrcs.Add(new Ssrc
{
Id = (uint)rtxSsrc,
Attribute = "msid",
Value = $"{streamId ?? "-"} {trackId}"
});
// Associate original and retransmission SSRCs.
_mediaObject.MediaDescription.Attributes.SsrcGroups.Add(new SsrcGroup
{
Semantics = "FID",
SsrcIds = new string[] { $"{ssrc} {rtxSsrc}" }
});
}
}
public void PlanBReceive(RtpParameters offerRtpParameters, string streamId, string trackId)
{
var encoding = offerRtpParameters.Encodings[0];
var ssrc = encoding.Ssrc;
var rtxSsrc = (encoding.Rtx is not null && encoding.Rtx.Ssrc.HasValue)
? encoding.Rtx.Ssrc
: null;
var payloads = _mediaObject.MediaDescription.Fmts.ToArray();
foreach (var codec in offerRtpParameters.Codecs)
{
if (payloads.Contains(codec.PayloadType.ToString()))
{
continue;
}
Rtpmap rtpmap = new()
{
PayloadType = codec.PayloadType,
EncodingName = GetCodecName(codec),
ClockRate = codec.ClockRate,
Channels = codec.Channels > 1 ? codec.Channels : null
};
_mediaObject.MediaDescription.Attributes.Rtpmaps.Add(rtpmap);
Fmtp fmtp = codec.Parameters.ToFmtp(codec.PayloadType);
if (!string.IsNullOrEmpty(fmtp.Value))
{
_mediaObject.MediaDescription.Attributes.Fmtps.Add(fmtp);
}
foreach (var fb in codec.RtcpFeedback)
{
_mediaObject.MediaDescription.Attributes.RtcpFbs.Add(new RtcpFb
{
PayloadType = codec.PayloadType,
Type = fb.Type,
SubType = fb.Parameter
});
}
}
((List <string>)_mediaObject.MediaDescription.Fmts).AddRange(offerRtpParameters.Codecs
.Where(codec => !_mediaObject.MediaDescription.Fmts.Contains(codec.PayloadType.ToString()))
.Select(codec => codec.PayloadType.ToString())
.ToArray());
if (offerRtpParameters.Rtcp.Cname is not null)
{
_mediaObject.MediaDescription.Attributes.Ssrcs.Add(new Ssrc
{
Id = (uint)ssrc,
Attribute = "cname",
Value = offerRtpParameters.Rtcp.Cname
});
}
_mediaObject.MediaDescription.Attributes.Ssrcs.Add(new Ssrc
{
Id = (uint)ssrc,
Attribute = "msid",
Value = $"{ streamId ?? "-"} { trackId}"
});
if (rtxSsrc is not null)
{
if (offerRtpParameters.Rtcp.Cname is not null)
{
_mediaObject.MediaDescription.Attributes.Ssrcs.Add(new Ssrc
{
Id = (uint)rtxSsrc,
Attribute = "cname",
Value = offerRtpParameters.Rtcp.Cname
});
}
_mediaObject.MediaDescription.Attributes.Ssrcs.Add(new Ssrc
{
Id = (uint)rtxSsrc,
Attribute = "msid",
Value = $"{ streamId ?? "-"} {trackId}"
});
// Associate original and retransmission SSRCs.
_mediaObject.MediaDescription.Attributes.SsrcGroups.Add(new SsrcGroup
{
Semantics = "FID",
SsrcIds = new string[] { $"{ ssrc }${rtxSsrc}" }
});
}
}
void PlanBStopReceiving(RtpParameters offerRtpParameters)
{
var encoding = offerRtpParameters.Encodings[0];
var ssrc = encoding.Ssrc;
var rtxSsrc = (encoding.Rtx is not null && encoding.Rtx.Ssrc.HasValue) ?
encoding.Rtx.Ssrc : null;
((List <Ssrc>)_mediaObject.MediaDescription.Attributes.Ssrcs).RemoveAll(s => s.Id != ssrc && s.Id != rtxSsrc);
if (rtxSsrc is not null)
{
((List <SsrcGroup>)_mediaObject.MediaDescription.Attributes.SsrcGroups).RemoveAll(g => g.SsrcIds.Any(id => id != $"{ssrc} {rtxSsrc}"));
}
}
public override void SetDtlsRole(DtlsRole?dtlsRole)
