ff_block_permute  817 libavcodec/mpegvideo.h void ff_block_permute(int16_t *block, uint8_t *permutation, const uint8_t *scantable, int last);
ff_block_permute 4547 libavcodec/mpegvideo_enc.c         ff_block_permute(block, s->idsp.idct_permutation,