LOWPASS16_FUNC    816 libavfilter/vf_waveform.c LOWPASS16_FUNC(column,        1, 0)
LOWPASS16_FUNC    817 libavfilter/vf_waveform.c LOWPASS16_FUNC(row_mirror,    0, 1)
LOWPASS16_FUNC    818 libavfilter/vf_waveform.c LOWPASS16_FUNC(row,           0, 0)