Revision 77c92c2d libavcodec/dsputil.h

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libavcodec/dsputil.h
165 165
    void (*fdct)(DCTELEM *block/* align 16*/);
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    /**
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     * block -> idct -> clip to unsigned 8 bit -> dest.<br>
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     * block -> idct -> clip to unsigned 8 bit -> dest.
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     * (-1392, 0, 0, ...) -> idct -> (-174, -174, ...) -> put -> (0, 0, ...)
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     * @param line_size size in pixels of a horizotal line of dest
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     */
......
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    void (*idct_add)(uint8_t *dest/*align 8*/, int line_size, DCTELEM *block/*align 16*/);
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    /**
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     * idct input permutation.<br>
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     * idct input permutation.
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     * an example to avoid confusion:
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     * - (->decode coeffs -> zigzag reorder -> dequant -> reference idct ->...)
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     * - (x -> referece dct -> reference idct -> x)
......
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void ff_block_permute(DCTELEM *block, uint8_t *permutation, const uint8_t *scantable, int last);
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/**
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 * Empty mmx state.<br>
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 * Empty mmx state.
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 * this must be called between any dsp function and float/double code.
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 * for example sin(); dsp->idct_put(); emms_c(); cos()
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 */

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