MAX_SHIFT         127 libavfilter/vf_noise.c             fp->prev_shift[i][j] = noise + (av_lfg_get(lfg) & (MAX_SHIFT - 1));
MAX_SHIFT         268 libavfilter/vf_noise.c                 fp->rand_shift[i] = av_lfg_get(&fp->lfg) & (MAX_SHIFT - 1);
MAX_SHIFT          30 libavfilter/vf_noise.h #define MAX_RES (MAX_NOISE-MAX_SHIFT)