mlib_VideoIDCT8x8_S16_S16_Q1_Mismatch (3MLIB)

Name

mlib_VideoIDCT8x8_S16_S16_Q1_Mismatch - inverse Discrete Cosine Transform

Synopsis

cc [ flag... ] file... –lmlib [ library... ]
#include <mlib.h>

mlib_status mlib_VideoIDCT8x8_S16_S16_Q1_Mismatch(
     mlib_s16 block[64], const mlib_s16 coeffs[64]);

Description

The mlib_VideoIDCT8x8_S16_S16_Q1_Mismatch() function computes the inverse IDCT in the inter mode.

This function is similar to mlib_VideoIDCT8x8_S16_S16_Q1() which should only be used when coeffs[u][v] (u,v = 0...7) are non-zero only for u and v less then 4. However, this function also allows element coeffs[7][7] to be non-zero. The primary benefit of this modification is that it can handle situations where coeffs[7][7] has been made non-zero by MPEG mismatch-control, allowing a simplified version of the IDCT to be undertaken for a much larger number of situations.

Parameters

The function takes the following arguments:

block

Pointer to an 8x8 motion-compensated block which is the difference between the reference block and current block. block must be 8-byte aligned.

coeffs

Pointer to the input DCT coefficients. coeffs must be 8-byte aligned. coeffs should be in S12 range or it should be obtained from the corresponding forward DCT.

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 also

mlib_VideoIDCT8x8_S16_S16_Q1(3MLIB), attributes(5)