mlib_VideoDeQuantizeIDCT8xmediaLmlib_VideoDeQuantizeIDCT8x8_S16_S16_B12(3MLIB)NAMEmlib_VideoDeQuantizeIDCT8x8_S16_S16_B12 - dequantization and inverse
Discrete Cosine Transform (IDCT)
SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>
mlib_status mlib_VideoDeQuantizeIDCT8x8_S16_S16_B12(
mlib_s16 block[64], const mlib_s16 coeffs[64],
const mlib_d64 dqtable[64]);
DESCRIPTION
The mlib_VideoDeQuantizeIDCT8x8_S16_S16_B12() function dequantizes the
quantized DCT coefficients and then computes the inverse DCT. It's a
combination of mlib_VideoDeQuantize_S16() and
mlib_VideoIDCT8x8_S16_S16_B12() for better performance. The output of
this function should be within the range of [-2048, 2047] if coeffs is
obtained from the corresponding mlib_VideoDCT8x8Quantize_S16_S16_B12()
function.
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:
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().
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_NA(3MLIB), mlib_VideoDeQuan‐
tizeIDCT8x8_U8_S16(3MLIB), mlib_VideoDeQuantizeI‐
DCT8x8_U8_S16_NA(3MLIB), mlib_VideoDeQuantizeInit_S16(3MLIB),
attributes(5)SunOS 5.10mlib_VideoDeQuantizeIDCT8x8_S16_S16_B12(3MLIB)
