man pages section 3: Multimedia Library Functions

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Updated: July 2014
 
 

mlib_VideoDCT2x2_S16_S16(3MLIB)

Name

mlib_VideoDCT2x2_S16_S16 - forward Discrete Cosine Transform (DCT)

Synopsis

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

mlib_status mlib_VideoDCT2x2_S16_S16(mlib_s16 coeffs[4],
    const mlib_s16 block[4]);

Description

The mlib_VideoDCT2x2_S16_S16() function computes the forward DCT for the destination DCT coefficients of data type mlib_s16 and a source block of data type mlib_s16. The input to the DCT routine is the difference between the current block and the reference block. The difference pixel can occupy nine bits and is represented as a 16-bit datum. The source and destination buffer addresses must be 8-byte aligned.

Parameters

The function takes the following arguments:

coeffs

Pointer to the destination DCT coefficients. coeffs must be 8-byte aligned.

block

Pointer to an 2x2 motion-compensated block that is the difference between the reference block and the current block. block must be 8-byte aligned.

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_VideoDCT2x2_S16_S16(3MLIB), mlib_VideoDCT4x4_S16_S16(3MLIB), mlib_VideoDCT8x8_S16_S16(3MLIB), mlib_VideoDCT8x8_S16_S16_B12(3MLIB), mlib_VideoDCT8x8_S16_S16_NA(3MLIB), mlib_VideoDCT8x8_S16_U8(3MLIB), mlib_VideoDCT8x8_S16_U8_NA(3MLIB), mlib_VideoDCT16x16_S16_S16(3MLIB), mlib_VideoDCT16x16_S16_S16_B10(3MLIB), mlib_VideoDeQuantize_S16(3MLIB), mlib_VideoDeQuantizeInit_S16(3MLIB), mlib_VideoQuantize_S16(3MLIB), mlib_VideoQuantizeInit_S16(3MLIB), attributes(5)