SEI message support (Display Orientation)

[tunjid]

Goin in through the source xiecc_rtmp.c, it seems the library only supports the following NAL unit types:

1. NonIDR [1] else if ((nal[0] & 0x1f) == 0x01) line 624
2. IDR [5] else if ((nal[0] & 0x1f) == 0x05) line 612
3. Sequence parameter set (SPS) [7] if (nal[0] == 0x67) line 521

I need to send an SEI message [6], specifically the device orientation. Can this be done with this library? Can it be done by adding another "if" statement?