Manual Pages for UNIX Operating System command usage for man mlib_VideoIDCT8x8_S16_S16_B12_NA

mediaLib Library Functions
                          mlib_VideoIDCT8x8_S16_S16_B12_NA(3MLIB)



NAME
     mlib_VideoIDCT8x8_S16_S16_B12_NA,
     mlib_VideoIDCT8x8_S16_S16_NA   -   inverse  Discrete  Cosine
     Transform

SYNOPSIS
     cc [ flag... ] file... -lmlib [ library... ]
     #include 

     mlib_status mlib_VideoIDCT8x8_S16_S16_B12_NA(
          mlib_s16 block[64], const mlib_s16 coeffs[64]);


     mlib_status mlib_VideoIDCT8x8_S16_S16_NA(
          mlib_s16 block[64], const mlib_s16 coeffs[64]);


DESCRIPTION
     The mlib_VideoIDCT8x8_S16_S16_B12_NA() function computes the
     inverse  DCT (called IDCT) for the output IDCT block of data
     type mlib_s16  and  input  DCT  coefficients  of  data  type
     mlib_s16.  This  function is not guaranteed to be IEEE-1180-
     compliant. The output of the IDCT routine should  be  within
     the  range  of  [-2048, 2047] if coeffs is obtained from the
     corresponding         forward          DCT          function
     mlib_VideoDCT8x8_S16_S16_B12_NA().


     This function requires no special address alignment.


     This function can be used in JPEG with 12-bit precision.


     For MPEG, the output, which is really the difference between
     the  current  block and the reference block, can occupy nine
     bits and is represented as a 16-bit datum. The  output  must
     be  added to the motion-compensated reference block in order
     to reconstruct the current block.


     Since mediaLib 2.5, mlib_VideoIDCT8x8_S16_S16_NA() has  been
     renamed     to    mlib_VideoIDCT8x8_S16_S16_B12_NA().    Now
     mlib_VideoIDCT8x8_S16_S16_NA()    is     an     alias     of
     mlib_VideoIDCT8x8_S16_S16_B12_NA().

PARAMETERS
     The function takes the following arguments:

     block     Pointer to an 8x8 block in the  current  frame  or
               motion-compensated reference block. block need not



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mediaLib Library Functions
                          mlib_VideoIDCT8x8_S16_S16_B12_NA(3MLIB)



               be 8-byte aligned.


     coeffs    Pointer to the  source  DCT  coefficients.  coeffs
               need not 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  attri-
     butes:



     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Interface Stability         | Committed                   |
    |_____________________________|_____________________________|
    | MT-Level                    | MT-Safe                     |
    |_____________________________|_____________________________|


SEE ALSO
     mlib_VideoIDCT_IEEE_S16_S16(3MLIB),
     mlib_VideoIDCT8x8_S16_S16_B12(3MLIB),
     mlib_VideoIDCT8x8_S16_S16_DC(3MLIB),
     mlib_VideoIDCT8x8_S16_S16_Q1(3MLIB),
     mlib_VideoIDCT8x8_S16_S16_Q1_Mismatch(3MLIB),
     mlib_VideoIDCT8x8_U8_S16(3MLIB),
     mlib_VideoIDCT8x8_U8_S16_DC(3MLIB),
     mlib_VideoIDCT8x8_U8_S16_NA(3MLIB),
     mlib_VideoIDCT8x8_U8_S16_Q1(3MLIB), attributes(5)


















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mediaLib Library Functions
                          mlib_VideoIDCT8x8_S16_S16_B12_NA(3MLIB)






















































SunOS 5.11           Last change: 2 Mar 2007                    3