Content-type: text/html Man page of mlib_VideoDCT8x8Quantize_S16_S16_B12

mlib_VideoDCT8x8Quantize_S16_S16_B12

Section: mediaLib Library Functions (3MLIB)
Updated: 2 Mar 2007
Index Return to Main Contents
 

NAME

mlib_VideoDCT8x8Quantize_S16_S16_B12 - forward Discrete Cosine Transform (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 forward DCT and then quantizes the DCT coefficients. It's a combination of mlib_VideoDCT8x8_S16_S16_B12() and mlib_VideoQuantize_S16() for better 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_VideoQuantizeInit_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 TYPEATTRIBUTE VALUE

Interface StabilityCommitted

MT-Level

 

SEE ALSO

mlib_VideoDCT8x8Quantize_S16_S16_B12_NA(3MLIB), mlib_VideoDCT8x8Quantize_S16_U8(3MLIB), mlib_VideoDCT8x8Quantize_S16_U8_NA(3MLIB), mlib_VideoQuantizeInit_S16(3MLIB), attributes(5)


 

Index

NAME
SYNOPSIS
DESCRIPTION
PARAMETERS
RETURN VALUES
ATTRIBUTES
SEE ALSO

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Time: 02:38:02 GMT, October 02, 2010