dirac_dwt.h

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/*
 * Copyright (C) 2004-2010 Michael Niedermayer <michaelni@gmx.at>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
 
#ifndef AVCODEC_DIRAC_DWT_H
#define AVCODEC_DIRAC_DWT_H
 
#include <stddef.h>
#include <stdint.h>
 
typedef int DWTELEM;
typedef short IDWTELEM;
 
#define MAX_DWT_SUPPORT 8
#define MAX_DECOMPOSITIONS 8
 
typedef struct DWTCompose {
    uint8_t *b[MAX_DWT_SUPPORT];
    int y;
} DWTCompose;
 
typedef struct DWTPlane {
    int width;
    int height;
    ptrdiff_t stride;
    uint8_t *buf;
    uint8_t *buf_base;
    uint8_t *tmp;
} DWTPlane;
 
struct DWTContext;
 
// Possible prototypes for vertical_compose functions
typedef void (*vertical_compose_2tap)(uint8_t *b0, uint8_t *b1, int width);
typedef void (*vertical_compose_3tap)(uint8_t *b0, uint8_t *b1, uint8_t *b2, int width);
typedef void (*vertical_compose_5tap)(uint8_t *b0, uint8_t *b1, uint8_t *b2, uint8_t *b3, uint8_t *b4, int width);
typedef void (*vertical_compose_9tap)(uint8_t *dst, uint8_t *b[8], int width);
 
typedef struct DWTContext {
    uint8_t *buffer;
    uint8_t *temp;
    int width;
    int height;
    ptrdiff_t stride;
    int decomposition_count;
    int support;
 
    void (*spatial_compose)(struct DWTContext *cs, int level, int width, int height, ptrdiff_t stride);
    union {
        vertical_compose_3tap tap3;
        vertical_compose_5tap tap5;
        vertical_compose_9tap tap9;
    } vertical_compose_l0, vertical_compose_h0;
    vertical_compose_3tap vertical_compose_l1;
    vertical_compose_3tap vertical_compose_h1;
    vertical_compose_2tap vertical_compose;     ///< one set of lowpass and highpass combined
    void (*horizontal_compose)(uint8_t *b, uint8_t *tmp, int width);
 
    DWTCompose cs[MAX_DECOMPOSITIONS];
} DWTContext;
 
enum dwt_type {
    DWT_SNOW_DAUB9_7,
    DWT_SNOW_LEGALL5_3,
    DWT_DIRAC_DD9_7,
    DWT_DIRAC_LEGALL5_3,
    DWT_DIRAC_DD13_7,
    DWT_DIRAC_HAAR0,
    DWT_DIRAC_HAAR1,
    DWT_DIRAC_FIDELITY,
    DWT_DIRAC_DAUB9_7,
    DWT_NUM_TYPES
};
 
// -1 if an error occurred, e.g. the dwt_type isn't recognized
int ff_spatial_idwt_init(DWTContext *d, DWTPlane *p, enum dwt_type type,
                         int decomposition_count, int bit_depth);
void ff_spatial_idwt_init_x86(DWTContext *d, enum dwt_type type);
 
void ff_spatial_idwt_slice2(DWTContext *d, int y);
 
// shared stuff for simd optimizations
#define COMPOSE_53iL0(b0, b1, b2)\
    (b1 - (unsigned)((int)(b0 + (unsigned)(b2) + 2) >> 2))
 
#define COMPOSE_DIRAC53iH0(b0, b1, b2)\
    (b1 + (unsigned)((int)(b0 + (unsigned)(b2) + 1) >> 1))
 
#define COMPOSE_DD97iH0(b0, b1, b2, b3, b4)\
    (int)(((unsigned)(b2) + ((int)(9U*b1 + 9U*b3 - b4 - b0 +  8) >> 4)))
 
#define COMPOSE_DD137iL0(b0, b1, b2, b3, b4)\
    (int)(((unsigned)(b2) - ((int)(9U*b1 + 9U*b3 - b4 - b0 + 16) >> 5)))
 
#define COMPOSE_HAARiL0(b0, b1)\
    ((int)(b0 - (unsigned)((int)(b1 + 1U) >> 1)))
 
#define COMPOSE_HAARiH0(b0, b1)\
    ((int)(b0 + (unsigned)(b1)))
 
#define COMPOSE_FIDELITYiL0(b0, b1, b2, b3, b4, b5, b6, b7, b8)\
    ((unsigned)b4 - ((int)(-8*(b0+(unsigned)b8) + 21*(b1+(unsigned)b7) - 46*(b2+(unsigned)b6) + 161*(b3+(unsigned)b5) + 128) >> 8))
 
#define COMPOSE_FIDELITYiH0(b0, b1, b2, b3, b4, b5, b6, b7, b8)\
    ((unsigned)b4 + ((int)(-2*(b0+(unsigned)b8) + 10*(b1+(unsigned)b7) - 25*(b2+(unsigned)b6) +  81*(b3+(unsigned)b5) + 128) >> 8))
 
#define COMPOSE_DAUB97iL1(b0, b1, b2)\
    ((unsigned)(b1) - ((int)(1817*(b0 + (unsigned)b2) + 2048) >> 12))
 
#define COMPOSE_DAUB97iH1(b0, b1, b2)\
    ((unsigned)(b1) - ((int)( 113*(b0 + (unsigned)b2) + 64) >> 7))
 
#define COMPOSE_DAUB97iL0(b0, b1, b2)\
    ((unsigned)(b1) + ((int)( 217*(b0 + (unsigned)b2) + 2048) >> 12))
 
#define COMPOSE_DAUB97iH0(b0, b1, b2)\
    ((unsigned)(b1) + ((int)(6497*(b0 + (unsigned)b2) + 2048) >> 12))
 
 
#endif /* AVCODEC_DWT_H */