mlib_videoidct8x8_s16_s16_b12(3mlib) [opensolaris man page]

mlib_VideoIDCT8x8_S16_S16_B12(3MLIB)			    mediaLib Library Functions			      mlib_VideoIDCT8x8_S16_S16_B12(3MLIB)

NAME

       mlib_VideoIDCT8x8_S16_S16_B12, mlib_VideoIDCT8x8_S16_S16 - inverse Discrete Cosine Transform

SYNOPSIS

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

       mlib_status mlib_VideoIDCT8x8_S16_S16_B12(
	    mlib_s16 block[64], const mlib_s16 coeffs[64]);

       mlib_status mlib_VideoIDCT8x8_S16_S16(
	    mlib_s16 block[64], const mlib_s16 coeffs[64]);

DESCRIPTION

       The  mlib_VideoIDCT8x8_S16_S16_B12()  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().

       The source and destination buffer addresses must be 8-byte aligned.

       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  repre-
       sented 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() has been renamed to mlib_VideoIDCT8x8_S16_S16_B12(). Now mlib_VideoIDCT8x8_S16_S16() is an
       alias of mlib_VideoIDCT8x8_S16_S16_B12().

PARAMETERS

       The function takes the following arguments:

       block	 Pointer to an 8x8 block in the current frame or motion-compensated reference block. block must be 8-byte aligned.

       coeffs	 Pointer to the source DCT coefficients. coeffs 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_VideoIDCT_IEEE_S16_S16(3MLIB),		mlib_VideoIDCT8x8_S16_S16_B12_NA(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)

SunOS 5.11							    2 Mar 2007				      mlib_VideoIDCT8x8_S16_S16_B12(3MLIB)

mlib_VideoIDCT8x8_S16_S16_B12_NA(3MLIB) 		    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.h>

       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  repre-
       sented 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 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 attributes:

       +-----------------------------+-----------------------------+
       |      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)

SunOS 5.11							    2 Mar 2007				   mlib_VideoIDCT8x8_S16_S16_B12_NA(3MLIB)