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;
return(vp8Header);
}
/// <summary>
/// Render a video RTP packet received from a remote party.
/// </summary>
/// <param name="rtpPacket">The RTP packet containing the video payload.</param>
private void RenderVideo(RTPPacket rtpPacket)
{
if ((rtpPacket.Payload[0] & 0x10) > 0)
{
RtpVP8Header vp8Header = RtpVP8Header.GetVP8Header(rtpPacket.Payload);
Buffer.BlockCopy(rtpPacket.Payload, vp8Header.Length, _currVideoFrame, _currVideoFramePosn, rtpPacket.Payload.Length - vp8Header.Length);
_currVideoFramePosn += rtpPacket.Payload.Length - vp8Header.Length;
if (rtpPacket.Header.MarkerBit == 1)
{
unsafe
{
fixed(byte *p = _currVideoFrame)
{
uint width = 0, height = 0;
byte[] i420 = null;
//Console.WriteLine($"Attempting vpx decode {_currVideoFramePosn} bytes.");
int decodeResult = _vpxDecoder.Decode(p, _currVideoFramePosn, ref i420, ref width, ref height);
if (decodeResult != 0)
{
Console.WriteLine("VPX decode of video sample failed.");
}
else
{
if (OnVideoSampleReady != null)
{
fixed(byte *r = i420)
{
byte[] bmp = null;
int stride = 0;
int convRes = _imgConverter.ConvertYUVToRGB(r, VideoSubTypesEnum.I420, (int)width, (int)height, VideoSubTypesEnum.BGR24, ref bmp, ref stride);
if (convRes == 0)
{
//fixed (byte* s = bmp)
//{
// System.Drawing.Bitmap bmpImage = new System.Drawing.Bitmap((int)width, (int)height, stride, System.Drawing.Imaging.PixelFormat.Format24bppRgb, (IntPtr)s);
//}
OnVideoSampleReady(bmp, width, height, stride);
}
else
{
Log.LogWarning("Pixel format conversion of decoded sample failed.");
}
}
}
}
}
}
_currVideoFramePosn = 0;
}
}
else
{
Log.LogWarning("Discarding RTP packet, VP8 header Start bit not set.");
Log.LogWarning($"rtp video, seqnum {rtpPacket.Header.SequenceNumber}, ts {rtpPacket.Header.Timestamp}, marker {rtpPacket.Header.MarkerBit}, payload {rtpPacket.Payload.Length}, payload[0-5] {rtpPacket.Payload.HexStr(5)}.");
}
}
