public static RTCRtpEncodingParameters ToWebRtc(this RtpEncodingParameters parameters)
{
RTCRtpEncodingParameters params_ = new()
{
//Ptime = parameters.
Rid = parameters.Rid,
};
if (parameters.CodecPayloadType.HasValue)
{
params_.CodecPayloadType = (byte)parameters.CodecPayloadType;
}
if (parameters.Dtx.HasValue)
{
params_.Dtx = (bool)parameters.Dtx ? RTCDtxStatus.Enabled : RTCDtxStatus.Disabled;
}
if (parameters.MaxBitrate.HasValue)
{
params_.MaxBitrate = (ulong)parameters.MaxBitrate;
}
if (parameters.MaxFramerate.HasValue)
{
params_.MaxFramerate = Convert.ToDouble(parameters.MaxFramerate);
}
if (parameters.ScaleResolutionDownBy.HasValue)
{
params_.ScaleResolutionDownBy = Convert.ToDouble(parameters.ScaleResolutionDownBy);
}
return(params_);
}
public void ValidateRtpEncodingParameters(RtpEncodingParameters encoding)
{
if (encoding.Rtx is not null)
{
// RTX ssrc is mandatory if rtx is present.
if (!encoding.Rtx.Ssrc.HasValue)
{
throw new Exception("missing encoding.rtx.ssrc");
}
}
// Dtx is optional. If unset set it to false.
if (!encoding.Dtx.HasValue)
{
encoding.Dtx = false;
}
}
public RtpParameters GetSendingRemoteRtpParameters(MediaKind kind,
ExtendedRtpCapabilities extendedRtpCapabilities)
{
List <RtpCodecParameters> codecs = new();
foreach (var extendedCodec in extendedRtpCapabilities.Codecs)
{
if (extendedCodec.Kind != kind)
{
continue;
}
RtpCodecParameters codec = new()
{
MimeType = extendedCodec.MimeType,
PayloadType = extendedCodec.LocalPayloadType,
ClockRate = extendedCodec.ClockRate,
Channels = extendedCodec.Channels,
Parameters = extendedCodec.RemoteParameters,
RtcpFeedback = extendedCodec.RtcpFeedback
};
codecs.Add(codec);
if (extendedCodec.LocalRtxPayloadType.HasValue)
{
RtpCodecParameters rtxCodec = new()
{
MimeType = $"{extendedCodec.Kind.DisplayName()}/rtx",
PayloadType = (int)extendedCodec.LocalRtxPayloadType,
ClockRate = extendedCodec.ClockRate,
Parameters = new Dictionary <string, object>
{
{ "apt", extendedCodec.LocalPayloadType }
},
RtcpFeedback = new RtcpFeedback[] { }
};
codecs.Add(rtxCodec);
}
}
List <RtpHeaderExtensionParameters> headerExtensions = new();
foreach (var extendedExtendion in extendedRtpCapabilities.HeaderExtensions)
{
// Ignore RTP extensions of a different kind and those not valid for sending.
if ((extendedExtendion.Kind != kind) ||
(extendedExtendion.Direction != Direction.SendRecv &&
extendedExtendion.Direction != Direction.SendOnly))
{
continue;
}
RtpHeaderExtensionParameters ext = new()
{
Uri = extendedExtendion.Uri,
Id = extendedExtendion.SendId,
Encrypt = (bool)extendedExtendion.PreferredEncrypt,
};
headerExtensions.Add(ext);
}
// Reduce codecs' RTCP feedback. Use Transport-CC if available, REMB otherwise.
if (headerExtensions.Any(ext =>
ext.Uri == "http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01"))
{
foreach (var codec in codecs)
{
codec.RtcpFeedback = codec.RtcpFeedback
.Where(fb => fb.Type != "goog-remb").ToArray();
}
}
else if (headerExtensions.Any(ext =>
ext.Uri == "http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time"))
{
foreach (var codec in codecs)
{
codec.RtcpFeedback = codec.RtcpFeedback
.Where(fb => fb.Type != "transport-cc").ToArray();
}
}
else
{
foreach (var codec in codecs)
{
codec.RtcpFeedback = codec.RtcpFeedback
.Where(fb => fb.Type != "transport-cc" && fb.Type != "goog-remb").ToArray();
}
}
return(new RtpParameters
{
Codecs = codecs.ToArray(),
HeaderExtensions = headerExtensions.ToArray(),
Encodings = new RtpEncodingParameters[] { },
Rtcp = new()
});
}
public RtpParameters GetSendingRtpParameters(MediaKind kind, ExtendedRtpCapabilities extendedRtpCapabilities)
{
List <RtpCodecParameters> codecs = new();
foreach (var extendedCodec in extendedRtpCapabilities.Codecs)
{
if (extendedCodec.Kind != kind)
{
continue;
}
RtpCodecParameters codec = new()
{
MimeType = extendedCodec.MimeType,
PayloadType = extendedCodec.LocalPayloadType,
ClockRate = extendedCodec.ClockRate,
Channels = extendedCodec.Channels,
Parameters = extendedCodec.LocalParameters,
RtcpFeedback = extendedCodec.RtcpFeedback
};
codecs.Add(codec);
if (extendedCodec.LocalRtxPayloadType.HasValue)
{
RtpCodecParameters rtxCodec = new()
{
MimeType = $"{extendedCodec.Kind.DisplayName()}/rtx",
PayloadType = (int)extendedCodec.LocalRtxPayloadType,
ClockRate = extendedCodec.ClockRate,
Parameters = new Dictionary <string, object>
{
{ "apt", extendedCodec.LocalPayloadType }
},
RtcpFeedback = new RtcpFeedback[] { }
};
codecs.Add(rtxCodec);
}
}
List <RtpHeaderExtensionParameters> headerExtensions = new();
foreach (var extendedExtendion in extendedRtpCapabilities.HeaderExtensions)
{
// Ignore RTP extensions of a different kind and those not valid for sending.
if ((extendedExtendion.Kind != kind) ||
(extendedExtendion.Direction != Direction.SendRecv &&
extendedExtendion.Direction != Direction.SendOnly))
{
continue;
}
RtpHeaderExtensionParameters ext = new()
{
Uri = extendedExtendion.Uri,
Id = extendedExtendion.SendId,
Encrypt = (bool)extendedExtendion.PreferredEncrypt,
Parameters = new()
};
headerExtensions.Add(ext);
}
return(new RtpParameters
{
Codecs = codecs.ToArray(),
HeaderExtensions = headerExtensions.ToArray(),
Encodings = new RtpEncodingParameters[] { },
Rtcp = new()
});
}
