8bit quantization

[CornN64]

To improve the 8bit quantization in the RTL mode with ½ LSB and round it to the nearest LSB I would suggest to replace the lines

*(data++) = (unsigned char)(((*xi << sample_shift) >> 8) + 128);
*(data++) = (unsigned char)(((*xq << sample_shift) >> 8) + 128);

with

*(data++) = (unsigned char)((((*xi << sample_shift) + 0x80) >> 8) + 128);
*(data++) = (unsigned char)((((*xq << sample_shift) + 0x80) >> 8) + 128);

or even more optimized

*(data++) = (unsigned char)(((*xi << sample_shift) + 0x8080) >> 8);
*(data++) = (unsigned char)(((*xq << sample_shift) + 0x8080) >> 8);

Cheers