void(* prefetch)(void *mem, int stride, int h)
void(* idct_add)(uint8_t *dest, int line_size, DCTELEM *block)
block -> idct -> add dest -> clip to unsigned 8 bit -> dest.
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
int lowres
low resolution decoding, 1-> 1/2 size, 2->1/4 size
void(* idct_put)(uint8_t *dest, int line_size, DCTELEM *block)
block -> idct -> clip to unsigned 8 bit -> dest.
void(* idct)(DCTELEM *block)
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
int idct_permutation_type
main external API structure.