AVDCT

AVDCT context. @note function pointers can be NULL if the specific features have been disabled at build time.

extern (C) @nogc nothrow

struct AVDCT {

const(AVClass)* av_class;

void function(short* block) idct;

ubyte[64] idct_permutation;

void function(short* block) fdct;

int dct_algo;

int idct_algo;

void function(short* block, const(ubyte)* pixels, ptrdiff_t line_size) get_pixels;

int bits_per_sample;

}

Members

Variables

av_class const(AVClass)* av_class;: Undocumented in source.
bits_per_sample int bits_per_sample;: Undocumented in source.
dct_algo int dct_algo;: DCT algorithm. must use AVOptions to set this field.
fdct void function(short* block) fdct;: Undocumented in source.
get_pixels void function(short* block, const(ubyte)* pixels, ptrdiff_t line_size) get_pixels;: Undocumented in source.
idct void function(short* block) idct;: Undocumented in source.
idct_algo int idct_algo;: IDCT algorithm. must use AVOptions to set this field.
idct_permutation ubyte[64] idct_permutation;: 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<br> 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 -> ...)

Meta

Source

See Implementation

ffmpeg libavcodec avdct functions

structs

AVDCT