void ff_jref_idct_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
void ff_j_rev_dct1(int16_t *data)
void ff_j_rev_dct2(int16_t *data)
void ff_j_rev_dct(int16_t *data)
void ff_jref_idct_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
void ff_j_rev_dct4(int16_t *data)
The exact code depends on how similar the blocks are and how related they are to the block