mlib_VideoDeQuantizeIDCT8xmediaLib(Limlib_VideoDeQuantizeIDCT8x8_U8_S16(3MLIB)NAMEmlib_VideoDeQuantizeIDCT8x8_U8_S16 - dequantization and inverse Dis‐
crete Cosine Transform (IDCT)
SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>
mlib_status mlib_VideoDeQuantizeIDCT8x8_U8_S16(
mlib_u8 *block, const mlib_s16 coeffs[64],
const mlib_d64 dqtable[64], mlib_s32 stride);
DESCRIPTION
The mlib_VideoDeQuantizeIDCT8x8_U8_S16() function dequantizes the quan‐
tized DCT coefficients and then computes the inverse DCT. It's a com‐
bination of mlib_VideoDeQuantize_S16() and mlib_VideoIDCT8x8_U8_S16()
for better performance.
The source and destination buffer addresses must be 8-byte aligned.
This function can be used in JPEG with 8-bit precision, or in MPEG for
the intra mode.
PARAMETERS
The function takes the following arguments:
block Pointer to an 8x8 block. Note that block must be 8-byte
aligned.
coeffs Pointer to the input quantized DCT coefficients. Note that
coeffs must be 8-byte aligned.
dqtable Pointer to the dequantization table generated by
mlib_VideoDeQuantizeInit_S16().
stride Stride in bytes between adjacent rows in the block. Note
that 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_VideoDeQuantizeIDCT8x8_S16_S16_B12(3MLIB), mlib_VideoDeQuantizeI‐
DCT8x8_S16_S16_B12_NA(3MLIB), mlib_VideoDeQuantizeI‐
DCT8x8_U8_S16_NA(3MLIB), mlib_VideoDeQuantizeInit_S16(3MLIB),
attributes(5)SunOS 5.10 2 Mmlib_VideoDeQuantizeIDCT8x8_U8_S16(3MLIB)
