mss34dsp.c File Reference

#include <stdint.h>
#include "libavutil/common.h"
#include "mss34dsp.h"
#include "jpegquanttables.h"

Go to the source code of this file.

Macros
#define	DCT_TEMPLATE(blk, step, SOP, shift)
#define	SOP_ROW(a)   (((a) * (1U << 16)) + 0x2000)
#define	SOP_COL(a)   (((a) + 32) * (1U << 16))

Functions
void	ff_mss34_gen_quant_mat (uint16_t *qmat, int quality, int luma)
	Generate quantisation matrix for given quality. More...
void	ff_mss34_dct_put (uint8_t *dst, ptrdiff_t stride, int *block)
	Transform and output DCT block. More...

Macro Definition Documentation

DCT_TEMPLATE

#define DCT_TEMPLATE	(		blk,
			step,
			SOP,
			shift
	)

Value:

    const unsigned t0 =-39409U * blk[7 * step] - 58980U * blk[1 * step]; \
    const unsigned t1 = 39410U * blk[1 * step] - 58980U * blk[7 * step]; \
    const unsigned t2 =-33410U * blk[5 * step] -167963U * blk[3 * step]; \
    const unsigned t3 = 33410U * blk[3 * step] -167963U * blk[5 * step]; \
    const unsigned t4 =          blk[3 * step] +          blk[7 * step]; \
    const unsigned t5 =          blk[1 * step] +          blk[5 * step]; \
    const unsigned t6 = 77062U * t4            + 51491U * t5;            \
    const unsigned t7 = 77062U * t5            - 51491U * t4;            \
    const unsigned t8 = 35470U * blk[2 * step] - 85623U * blk[6 * step]; \
    const unsigned t9 = 35470U * blk[6 * step] + 85623U * blk[2 * step]; \
    const unsigned tA = SOP(blk[0 * step] - blk[4 * step]);              \
    const unsigned tB = SOP(blk[0 * step] + blk[4 * step]);              \
                                                                    \
    blk[0 * step] = (int)(  t1 + t6  + t9 + tB) >> shift;                \
    blk[1 * step] = (int)(  t3 + t7  + t8 + tA) >> shift;                \
    blk[2 * step] = (int)(  t2 + t6  - t8 + tA) >> shift;                \
    blk[3 * step] = (int)(  t0 + t7  - t9 + tB) >> shift;                \
    blk[4 * step] = (int)(-(t0 + t7) - t9 + tB) >> shift;                \
    blk[5 * step] = (int)(-(t2 + t6) - t8 + tA) >> shift;                \
    blk[6 * step] = (int)(-(t3 + t7) + t8 + tA) >> shift;                \
    blk[7 * step] = (int)(-(t1 + t6) + t9 + tB) >> shift;                \

Definition at line 43 of file mss34dsp.c.

SOP_ROW

#define SOP_ROW

(

a

)

(((a) * (1U << 16)) + 0x2000)

Definition at line 66 of file mss34dsp.c.

SOP_COL

#define SOP_COL

(

a

)

(((a) + 32) * (1U << 16))

Definition at line 67 of file mss34dsp.c.

Function Documentation

ff_mss34_gen_quant_mat()

void ff_mss34_gen_quant_mat	(	uint16_t *	qmat,
		int	quality,
		int	luma
	)

Generate quantisation matrix for given quality.

Parameters

qmat	destination matrix
quality	quality setting (1-100)
luma	generate quantisation matrix for luma or chroma

Definition at line 27 of file mss34dsp.c.

Referenced by mss4_decode_frame(), and reset_coders().

ff_mss34_dct_put()

void ff_mss34_dct_put	(	uint8_t *	dst,
		ptrdiff_t	stride,
		int *	block
	)

Transform and output DCT block.

Parameters

dst	output plane
stride	output plane stride
block	block to transform and output

Definition at line 69 of file mss34dsp.c.

Referenced by decode_dct_block(), and mss4_decode_dct_block().