public static RTPVP8Header GetVP8Header(byte[] rtpPayload)
{
RTPVP8Header vp8Header = new RTPVP8Header();
int payloadHeaderStartIndex = 1;
// First byte of payload descriptor.
vp8Header.ExtendedControlBitsPresent = ((rtpPayload[0] >> 7) & 0x01) == 1;
vp8Header.StartOfVP8Partition = ((rtpPayload[0] >> 4) & 0x01) == 1;
vp8Header._length = 1;
// Is second byte being used.
if (vp8Header.ExtendedControlBitsPresent)
{
vp8Header.IsPictureIDPresent = ((rtpPayload[1] >> 7) & 0x01) == 1;
vp8Header._length = 2;
payloadHeaderStartIndex = 2;
}
// Is the picture ID being used.
if (vp8Header.IsPictureIDPresent)
{
if (((rtpPayload[2] >> 7) & 0x01) == 1)
{
// The Picure ID is using two bytes.
vp8Header._length = 4;
payloadHeaderStartIndex = 4;
vp8Header.PictureID = BitConverter.ToUInt16(rtpPayload, 2);
}
else
{
// The picture ID is using one byte.
vp8Header.PictureID = rtpPayload[2];
vp8Header._length = 3;
payloadHeaderStartIndex = 3;
}
}
vp8Header._payloadDescriptorLength = payloadHeaderStartIndex;
// Payload header only on first packet in frame.
if (vp8Header.StartOfVP8Partition)
{
byte s0 = (byte)((rtpPayload[payloadHeaderStartIndex] >> 5) & 0x07);
vp8Header.ShowFrame = (byte)((rtpPayload[payloadHeaderStartIndex] >> 4) & 0x01) == 1;
vp8Header.IsKeyFrame = (rtpPayload[payloadHeaderStartIndex] & 0x01) == 0;
byte s1 = rtpPayload[payloadHeaderStartIndex + 1];
byte s2 = rtpPayload[payloadHeaderStartIndex + 2];
vp8Header.FirstPartitionSize = s0 + (8 * s1) + (2048 * s2);
vp8Header._length += 3;
}
return(vp8Header);
}
public static RTPVP8Header GetVP8Header(byte[] rtpPayload)
{
RTPVP8Header vp8Header = new RTPVP8Header();
int payloadHeaderStartIndex = 1;
// First byte of payload descriptor.
vp8Header.ExtendedControlBitsPresent = ((rtpPayload[0] >> 7) & 0x01) == 1;
vp8Header.StartOfVP8Partition = ((rtpPayload[0] >> 4) & 0x01) == 1;
vp8Header._length = 1;
// Is second byte being used.
if(vp8Header.ExtendedControlBitsPresent)
{
vp8Header.IsPictureIDPresent = ((rtpPayload[1] >> 7) & 0x01) == 1;
vp8Header._length = 2;
payloadHeaderStartIndex = 2;
}
// Is the picture ID being used.
if(vp8Header.IsPictureIDPresent)
{
if (((rtpPayload[2] >> 7) & 0x01) == 1)
{
// The Picure ID is using two bytes.
vp8Header._length = 4;
payloadHeaderStartIndex = 4;
vp8Header.PictureID = BitConverter.ToUInt16(rtpPayload, 2);
}
else
{
// The picture ID is using one byte.
vp8Header.PictureID = rtpPayload[2];
vp8Header._length = 3;
payloadHeaderStartIndex = 3;
}
}
vp8Header._payloadDescriptorLength = payloadHeaderStartIndex;
// Payload header only on first packet in frame.
if (vp8Header.StartOfVP8Partition)
{
byte s0 = (byte)((rtpPayload[payloadHeaderStartIndex] >> 5) & 0x07);
vp8Header.ShowFrame = (byte)((rtpPayload[payloadHeaderStartIndex] >> 4) & 0x01) == 1;
vp8Header.IsKeyFrame = (rtpPayload[payloadHeaderStartIndex] & 0x01) == 0;
byte s1 = rtpPayload[payloadHeaderStartIndex + 1];
byte s2 = rtpPayload[payloadHeaderStartIndex + 2];
vp8Header.FirstPartitionSize = s0 + (8 * s1) + (2048 * s2);
vp8Header._length += 3;
}
return vp8Header;
}
public byte[] GetFramePayload()
{
List <byte> payload = new List <byte>();
foreach (var rtpPacket in _packets.OrderBy(x => x.Header.SequenceNumber))
{
if (FrameType == FrameTypesEnum.VP8)
{
var vp8Header = RTPVP8Header.GetVP8Header(rtpPacket.Payload);
payload.AddRange(rtpPacket.Payload.Skip(vp8Header.PayloadDescriptorLength));
}
else
{
payload.AddRange(rtpPacket.Payload);
}
}
return(payload.ToArray());
}
private static void SendRTPFromVP8FramesFile(string file)
{
try
{
StreamReader sr = new StreamReader(file);
List<string> samples = new List<string>();
while (!sr.EndOfStream)
{
string sample = sr.ReadLine();
samples.Add(sample);
//Console.WriteLine(sample);
//string[] sampleFields = sample.Split(',');
//RTPVP8Header frameVP8Header = RTPVP8Header.GetVP8Header(Convert.FromBase64String(sampleFields[0]));
//byte[] rtpPaylaod = Convert.FromBase64String(sampleFields[1]);
//Console.WriteLine((frameVP8Header.IsKeyFrame) ? "K" : "." + " " + frameVP8Header.FirstPartitionSize + " " + rtpPaylaod.Length + ".");
}
sr.Close();
logger.Debug(samples.Count + " encoded samples loaded.");
//_newRTPReceiverSRTP = new SRTPManaged(Convert.FromBase64String(_sourceSRTPKey));
//_newRTPReceiverSRTP = new SRTPManaged();
int sampleIndex = 0;
while (true)
{
if (_webRTCClients.Count != 0)
{
var sampleItem = samples[sampleIndex];
string[] sampleFields = sampleItem.Split(',');
RTPVP8Header frameVP8Header = RTPVP8Header.GetVP8Header(Convert.FromBase64String(sampleFields[0]));
byte[] sample = Convert.FromBase64String(sampleFields[1]);
if (frameVP8Header.IsKeyFrame)
{
Console.WriteLine("Key frame.");
}
lock (_webRTCClients)
{
foreach (var client in _webRTCClients.Where(x => x.STUNExchangeComplete))
{
try
{
if (client.LastTimestamp == 0)
{
client.LastTimestamp = RTSPSession.DateTimeToNptTimestamp32(DateTime.Now);
}
for (int index = 0; index * RTP_MAX_PAYLOAD < sample.Length; index++)
{
int offset = (index == 0) ? 0 : (index * RTP_MAX_PAYLOAD);
int payloadLength = (offset + RTP_MAX_PAYLOAD < sample.Length) ? RTP_MAX_PAYLOAD : sample.Length - offset;
RTPVP8Header packetVP8Header = new RTPVP8Header()
{
ExtendedControlBitsPresent = true,
IsPictureIDPresent = true,
ShowFrame = true,
};
if (index == 0)
{
packetVP8Header.StartOfVP8Partition = true;
//packetVP8Header.FirstPartitionSize = frameVP8Header.FirstPartitionSize;
packetVP8Header.IsKeyFrame = frameVP8Header.IsKeyFrame;
packetVP8Header.PictureID = (frameVP8Header.IsKeyFrame) ? (byte)0x00 : frameVP8Header.PictureID;
}
byte[] vp8HeaderBytes = packetVP8Header.GetBytes();
RTPPacket rtpPacket = new RTPPacket(packetVP8Header.Length + payloadLength + SRTP_AUTH_KEY_LENGTH);
rtpPacket.Header.SyncSource = client.SSRC;
rtpPacket.Header.SequenceNumber = client.SequenceNumber++;
rtpPacket.Header.Timestamp = client.LastTimestamp;
rtpPacket.Header.MarkerBit = ((offset + payloadLength) >= sample.Length) ? 1 : 0;
rtpPacket.Header.PayloadType = 100;
Buffer.BlockCopy(vp8HeaderBytes, 0, rtpPacket.Payload, 0, packetVP8Header.Length);
Buffer.BlockCopy(sample, offset, rtpPacket.Payload, packetVP8Header.Length, payloadLength);
var rtpBuffer = rtpPacket.GetBytes();
_webRTCReceiverClient.Send(rtpBuffer, rtpBuffer.Length - SRTP_AUTH_KEY_LENGTH, _wiresharpEP);
int rtperr = client.SrtpContext.ProtectRTP(rtpBuffer, rtpBuffer.Length - SRTP_AUTH_KEY_LENGTH);
if (rtperr != 0)
{
logger.Debug("New RTP packet protect result " + rtperr + ".");
}
logger.Debug("Sending RTP " + sample.Length + " bytes to " + client.SocketAddress + ", timestamp " + client.LastTimestamp + ", marker " + rtpPacket.Header.MarkerBit + ".");
_webRTCReceiverClient.Send(rtpBuffer, rtpBuffer.Length, client.SocketAddress);
}
client.LastTimestamp += TIMESTAMP_SPACING;
}
catch (Exception sendExcp)
{
logger.Error("SendRTPFromVP8FramesFile exception sending to " + client.SocketAddress + ". " + sendExcp.Message);
}
}
}
sampleIndex++;
if (sampleIndex >= samples.Count - 1)
{
sampleIndex = 0;
}
Thread.Sleep(30);
}
}
}
catch (Exception excp)
{
Console.WriteLine("Exception SendRTPFromVP8FramesFile. " + excp);
}
}