mlib_VideoIDCT8x8_U8_S16_DmediaLib Library Fmlib_VideoIDCT8x8_U8_S16_DC(3MLIB)NAMEmlib_VideoIDCT8x8_U8_S16_DC - inverse Discrete Cosine Transform
SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>
mlib_status mlib_VideoIDCT8x8_U8_S16_DC(mlib_u8 *block,
const mlib_s16 *coeffs, mlib_s32 stride);
DESCRIPTION
The mlib_VideoIDCT8x8_U8_S16_DC() function can be used only when F(0,0)
is nonzero. It computes the inverse DCT (called IDCT) for the destina‐
tion IDCT block of data type mlib_u8 and source DCT coefficients of
data type mlib_s16. This function is not guaranteed to be
IEEE-1180-compliant. The output of the IDCT routine is the difference
between the current block and the reference block. The difference pixel
can occupy nine bits and is represented as a 16-bit datum. The output
must be added to the motion-compensated reference block in order to
reconstruct the current block.
PARAMETERS
The function takes the following arguments:
block Pointer to the current block. block must be 8-byte aligned.
coeffs Pointer to the source DCT coefficients. coeffs must be 8-byte
aligned.
stride Stride, in bytes, between adjacent rows in a block. stride
must be a multiple of eight..
RETURN VALUES
The function returns MLIB_SUCCESS if successful. Otherwise it returns
MLIB_FAILURE.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Committed │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │MT-Safe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOmlib_VideoIDCT_IEEE_S16_S16(3MLIB), mlib_VideoIDCT8x8_S16_S16(3MLIB),
mlib_VideoIDCT8x8_S16_S16_DC(3MLIB),
mlib_VideoIDCT8x8_S16_S16_NA(3MLIB),
mlib_VideoIDCT8x8_S16_S16_Q1(3MLIB), mlib_VideoIDCT8x8_U8_S16(3MLIB),
mlib_VideoIDCT8x8_U8_S16_NA(3MLIB), mlib_VideoIDCT8x8_U8_S16_Q1(3MLIB),
attributes(5)SunOS 5.10 2 Mar 2007mlib_VideoIDCT8x8_U8_S16_DC(3MLIB)
