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

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...

Variables
static const uint8_t	luma_quant [64]

static const uint8_t	chroma_quant [64]

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 64 of file mss34dsp.c.

◆ SOP_ROW

#define SOP_ROW ( a ) (((a) * (1U << 16)) + 0x2000)

Definition at line 87 of file mss34dsp.c.

◆ SOP_COL

#define SOP_COL ( a ) (((a) + 32) * (1U << 16))

Definition at line 88 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 48 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 90 of file mss34dsp.c.

Referenced by decode_dct_block(), and mss4_decode_dct_block().

Variable Documentation

◆ luma_quant

const uint8_t luma_quant[64]

static

Initial value:

= {
    16,  11,  10,  16,  24,  40,  51,  61,
    12,  12,  14,  19,  26,  58,  60,  55,
    14,  13,  16,  24,  40,  57,  69,  56,
    14,  17,  22,  29,  51,  87,  80,  62,
    18,  22,  37,  56,  68, 109, 103,  77,
    24,  35,  55,  64,  81, 104, 113,  92,
    49,  64,  78,  87, 103, 121, 120, 101,
    72,  92,  95,  98, 112, 100, 103,  99
}

Definition at line 26 of file mss34dsp.c.

Referenced by ff_mss34_gen_quant_mat().

◆ chroma_quant

const uint8_t chroma_quant[64]