1mlib_VideoIDCT8x8_S16_S16_Bm1e2d(i3aMLLiIbB)LibrarymFluinbc_tViiodnesoIDCT8x8_S16_S16_B12(3MLIB)
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NAME

6       mlib_VideoIDCT8x8_S16_S16_B12, mlib_VideoIDCT8x8_S16_S16 - inverse Dis‐
7       crete Cosine Transform
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SYNOPSIS

10       cc [ flag... ] file... -lmlib [ library... ]
11       #include <mlib.h>
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13       mlib_status mlib_VideoIDCT8x8_S16_S16_B12(
14            mlib_s16 block[64], const mlib_s16 coeffs[64]);
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17       mlib_status mlib_VideoIDCT8x8_S16_S16(
18            mlib_s16 block[64], const mlib_s16 coeffs[64]);
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DESCRIPTION

22       The mlib_VideoIDCT8x8_S16_S16_B12() function computes the  inverse  DCT
23       (called IDCT) for the output IDCT block of data type mlib_s16 and input
24       DCT coefficients of data type mlib_s16. This function is not guaranteed
25       to  be  IEEE-1180-compliant.  The  output of the IDCT routine should be
26       within the range of [-2048, 2047] if coeffs is obtained from the corre‐
27       sponding forward DCT function mlib_VideoDCT8x8_S16_S16_B12().
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30       The source and destination buffer addresses must be 8-byte aligned.
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33       This function can be used in JPEG with 12-bit precision.
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36       For  MPEG,  the output, which is really the difference between the cur‐
37       rent block and the reference block, can occupy nine bits and is  repre‐
38       sented  as  a 16-bit datum. The output must be added to the motion-com‐
39       pensated reference block in order to reconstruct the current block.
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42       Since mediaLib 2.5, mlib_VideoIDCT8x8_S16_S16()  has  been  renamed  to
43       mlib_VideoIDCT8x8_S16_S16_B12().  Now mlib_VideoIDCT8x8_S16_S16() is an
44       alias of mlib_VideoIDCT8x8_S16_S16_B12().
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PARAMETERS

47       The function takes the following arguments:
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49       block     Pointer to an 8x8 block in the current frame  or  motion-com‐
50                 pensated reference block. block must be 8-byte aligned.
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53       coeffs    Pointer to the source DCT coefficients. coeffs must be 8-byte
54                 aligned.
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RETURN VALUES

58       The function returns MLIB_SUCCESS if successful. Otherwise  it  returns
59       MLIB_FAILURE.
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ATTRIBUTES

62       See attributes(5) for descriptions of the following attributes:
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67       ┌─────────────────────────────┬─────────────────────────────┐
68       │      ATTRIBUTE TYPE         │      ATTRIBUTE VALUE        │
69       ├─────────────────────────────┼─────────────────────────────┤
70       │Interface Stability          │Committed                    │
71       ├─────────────────────────────┼─────────────────────────────┤
72       │MT-Level                     │MT-Safe                      │
73       └─────────────────────────────┴─────────────────────────────┘
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SEE ALSO

76       mlib_VideoIDCT_IEEE_S16_S16(3MLIB),
77       mlib_VideoIDCT8x8_S16_S16_B12_NA(3MLIB),
78       mlib_VideoIDCT8x8_S16_S16_DC(3MLIB),
79       mlib_VideoIDCT8x8_S16_S16_Q1(3MLIB),  mlib_VideoIDCT8x8_S16_S16_Q1_Mis‐
80       match(3MLIB),                          mlib_VideoIDCT8x8_U8_S16(3MLIB),
81       mlib_VideoIDCT8x8_U8_S16_DC(3MLIB), mlib_VideoIDCT8x8_U8_S16_NA(3MLIB),
82       mlib_VideoIDCT8x8_U8_S16_Q1(3MLIB), attributes(5)
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86SunOS 5.11                        2 Mar 200m7lib_VideoIDCT8x8_S16_S16_B12(3MLIB)
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