pub fn ff_simple_idct84_int16_8bit(block: &mut [i16; 64], row0: usize)Expand description
Transform one 8x4 coefficient half in place without adding it to a pixel
destination. This is the transform portion of FFmpeg’s
ff_simple_idct84_add() and is used by WMV3 Simple/Main when RES_FASTTX=0.
row0 is 0 for the upper 8x4 half and 4 for the lower half.