libavcodec/mss34dsp.c File Reference

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

Go to the source code of this file.

Defines
#define	DCT_TEMPLATE(blk, step, SOP, shift)
#define	SOP_ROW(a)   ((a) << 16) + 0x2000
#define	SOP_COL(a)   ((a + 32) << 16)
Functions
void	ff_mss34_gen_quant_mat (uint16_t *qmat, int quality, int luma)
	Generate quantisation matrix for given quality.
void	ff_mss34_dct_put (uint8_t *dst, int stride, int *block)
	Transform and output DCT block.
Variables
static const uint8_t	luma_quant [64]
static const uint8_t	chroma_quant [64]

---

Define Documentation

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

Value:

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

Definition at line 64 of file mss34dsp.c.

Referenced by ff_mss34_dct_put().

#define SOP_COL

(

a

)

((a + 32) << 16)

Definition at line 88 of file mss34dsp.c.

Referenced by ff_mss34_dct_put().

#define SOP_ROW

(

a

)

((a) << 16) + 0x2000

Definition at line 87 of file mss34dsp.c.

Referenced by ff_mss34_dct_put().

---

Function Documentation

void ff_mss34_dct_put	(	uint8_t *	dst,
		int	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().

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().

---

Variable Documentation

const uint8_t chroma_quant[64] [static]

Initial value:

 {
    17, 18, 24, 47, 99, 99, 99, 99,
    18, 21, 26, 66, 99, 99, 99, 99,
    24, 26, 56, 99, 99, 99, 99, 99,
    47, 66, 99, 99, 99, 99, 99, 99,
    99, 99, 99, 99, 99, 99, 99, 99,
    99, 99, 99, 99, 99, 99, 99, 99,
    99, 99, 99, 99, 99, 99, 99, 99,
    99, 99, 99, 99, 99, 99, 99, 99
}

Definition at line 37 of file mss34dsp.c.

Referenced by ff_mss34_gen_quant_mat().

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().