mlib_VideoDCT8x8Quantize_SmediaLib1mlib_VideoDCT8x8Quantize_S16_S16_B12(3MLIB)NAMEmlib_VideoDCT8x8Quantize_S16_S16_B12 - forward Discrete Cosine Trans‐
form (DCT) and quantization
SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>
mlib_status mlib_VideoDCT8x8Quantize_S16_S16_B12(
mlib_s16 coeffs[64], const mlib_s16 block[64],
const mlib_d64 dqtable[64]);
DESCRIPTION
The mlib_VideoDCT8x8Quantize_S16_S16_B12() function computes the for‐
ward DCT and then quantizes the DCT coefficients. It's a combination
of mlib_VideoDCT8x8_S16_S16_B12() and mlib_VideoQuantize_S16() for bet‐
ter performance. The source to the DCT routine can occupy up to 12
bits for each of its elements, i.e., should be within the range of
[-2048, 2047].
The source and destination buffer addresses must be 8-byte aligned.
This function can be used in JPEG with 12-bit precision, or in MPEG for
the inter 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().
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_NA(3MLIB), mlib_VideoDCT8x8Quan‐
tize_S16_U8(3MLIB), mlib_VideoDCT8x8Quantize_S16_U8_NA(3MLIB),
mlib_VideoQuantizeInit_S16(3MLIB), attributes(5)SunOS 5.102mlib_VideoDCT8x8Quantize_S16_S16_B12(3MLIB)
