pub fn quant_dz_ff(qp: u8, dz_div: i64) -> [i16; 8]Expand description
The 8-entry deadzone offset table FF[pos] = round(F / MF) reproducing our
(|c|·MF + F) >> qbits deadzone (F = 2^qbits / dz_div) inside openh264’s
((|c| + FF)·MF_oh) >> 16 quantizer — so the asm WelsQuant*4x4 kernels quantize
bit-identically to our scalar quantize. Pair with QUANT_MF_OH[qp] as MF.