/// <param name="payload">frame data</param>
/// <param name="payLoadLen">actual length of frame data</param>
/// <param name="pts">presentation timestamp</param>
/// <param name="ptsNum">numerator of timebase</param>
/// <param name="ptsDen">denominator of timebase</param>
/// <param name="ptsIndex">which timestamp base is used, assumed to be also stream number</param>
public NutFrame(byte[] payload, int payLoadLen, ulong pts, ulong ptsNum, ulong ptsDen, int ptsIndex, ReusableBufferPool <byte> pool)
{
_pts = pts;
_ptsNum = ptsNum;
_ptsDen = ptsDen;
_pool = pool;
_data = pool.GetBufferAtLeast(payLoadLen + 2048);
var frame = new MemoryStream(_data);
// create syncpoint
var sync = new NutPacket(NutPacket.StartCode.Syncpoint, frame);
WriteVarU(pts * 2 + (ulong)ptsIndex, sync); // global_key_pts
WriteVarU(1, sync); // back_ptr_div_16, this is wrong
sync.Flush();
var frameHeader = new MemoryStream();
frameHeader.WriteByte(0); // frame_code
// frame_flags = FLAG_CODED, so:
int flags = 0;
flags |= 1 << 0; // FLAG_KEY
if (payLoadLen == 0)
{
flags |= 1 << 1; // FLAG_EOR
}
flags |= 1 << 3; // FLAG_CODED_PTS
flags |= 1 << 4; // FLAG_STREAM_ID
flags |= 1 << 5; // FLAG_SIZE_MSB
flags |= 1 << 6; // FLAG_CHECKSUM
WriteVarU(flags, frameHeader);
WriteVarU(ptsIndex, frameHeader); // stream_id
WriteVarU(pts + 256, frameHeader); // coded_pts = pts + 1 << msb_pts_shift
WriteVarU(payLoadLen, frameHeader); // data_size_msb
var frameHeaderArr = frameHeader.ToArray();
frame.Write(frameHeaderArr, 0, frameHeaderArr.Length);
WriteBe32(NutCRC32(frameHeaderArr), frame); // checksum
frame.Write(payload, 0, payLoadLen);
_actualLength = (int)frame.Position;
}
