#include <avdct.h>
AVDCT context.
- Note
- function pointers can be NULL if the specific features have been disabled at build time.
int AVDCT::bits_per_sample |
DCT algorithm. must use AVOptions to set this field.
void(* AVDCT::fdct) (int16_t *block) |
void(* AVDCT::get_pixels) (int16_t *block, const uint8_t *pixels, ptrdiff_t line_size) |
void(* AVDCT::idct) (int16_t *block) |
IDCT algorithm. must use AVOptions to set this field.
uint8_t AVDCT::idct_permutation[64] |
IDCT input permutation. Several optimized IDCTs need a permutated input (relative to the normal order of the reference IDCT). This permutation must be performed before the idct_put/add. Note, normally this can be merged with the zigzag/alternate scan
An example to avoid confusion:
- (->decode coeffs -> zigzag reorder -> dequant -> reference IDCT -> ...)
- (x -> reference DCT -> reference IDCT -> x)
- (x -> reference DCT -> simple_mmx_perm = idct_permutation -> simple_idct_mmx -> x)
- (-> decode coeffs -> zigzag reorder -> simple_mmx_perm -> dequant -> simple_idct_mmx -> ...)
The documentation for this struct was generated from the following file:
- src/acoustid/chromaprint/libavcodec/avdct.h