mlib_VideoDCT8x8Quantize_SmediaLibLLibramlib_VideoDCT8x8Quantize_S16_U8(3MLIB)NAMEmlib_VideoDCT8x8Quantize_S16_U8 - forward Discrete Cosine Transform
(DCT) and quantization
SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>
mlib_status mlib_VideoDCT8x8Quantize_S16_U8(
mlib_s16 coeffs[64], const mlib_u8 *block,
const mlib_d64 dqtable[64], mlib_s32 stride);
DESCRIPTION
The mlib_VideoDCT8x8Quantize_S16_U8() function computes the forward DCT
and then quantizes the DCT coefficients. It's a combination of
mlib_VideoDCT8x8_S16_U8() and mlib_VideoQuantize_S16() for better per‐
formance.
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:
coeffs Pointer to the quantized DCT coefficients. Note that coeffs
must be 8-byte aligned.
block Pointer to an 8x8 block. Note that block must be 8-byte
aligned.
dqtable Pointer to the quantization table generated by mlib_Video‐
QuantizeInit_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_VideoDCT8x8Quantize_S16_S16_B12(3MLIB), mlib_VideoDCT8x8Quan‐
tize_S16_S16_B12_NA(3MLIB), mlib_VideoDCT8x8Quantize_S16_U8_NA(3MLIB),
mlib_VideoQuantizeInit_S16(3MLIB), attributes(5)SunOS 5.10 2 Mar mlib_VideoDCT8x8Quantize_S16_U8(3MLIB)
