static async Task <(uint time, Space <byte> random)> WriteC1Async(Stream stream)
{
var writer = new AmfWriter(new byte[C1Length], EmptyContext);
var random = RandomEx.GetBytes(RandomLength);
var time = Ts.CurrentTime;
writer.WriteByte(3); // rtmp version (constant 3) [c0]
writer.WriteUInt32(time); // time [c1]
writer.WriteUInt32(0); // zero [c1]
writer.WriteBytes(random); // random bytes [c1]
await stream.WriteAsync(writer.Span);
writer.Return();
return(time, random);
}