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/*

 * Copyright (C) 2004 Michael Niedermayer 

 * Copyright (C) 2006 Robert Edele 

 *

 * 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_SNOW_H

#define AVCODEC_SNOW_H

#include "dsputil.h"

#include "hpeldsp.h"

#include "snow_dwt.h"

#include "rangecoder.h"

#include "mathops.h"

#include "mpegvideo.h"

#include "h264qpel.h"

#define MID_STATE 128

#define MAX_PLANES 4

#define QSHIFT 5

#define QROOT (1<

#define LOSSLESS_QLOG -128

#define FRAC_BITS 4

#define MAX_REF_FRAMES 8

#define LOG2_OBMC_MAX 8

#define OBMC_MAX (1<<(LOG2_OBMC_MAX))

typedef struct BlockNode{

    int16_t mx;

    int16_t my;

    uint8_t ref;

    uint8_t color[3];

    uint8_t type;

//#define TYPE_SPLIT    1

#define BLOCK_INTRA   1

#define BLOCK_OPT     2

//#define TYPE_NOCOLOR  4

    uint8_t level; //FIXME merge into type?

}BlockNode;

static const BlockNode null_block= { //FIXME add border maybe

    .color= {128,128,128},

    .mx= 0,

    .my= 0,

    .ref= 0,

    .type= 0,

    .level= 0,

};

#define LOG2_MB_SIZE 4

#define MB_SIZE (1<

#define ENCODER_EXTRA_BITS 4

#define HTAPS_MAX 8

typedef struct x_and_coeff{

    int16_t x;

    uint16_t coeff;

} x_and_coeff;

typedef struct SubBand{

    int level;

    int stride;

    int width;

    int height;

    int qlog;        ///< log(qscale)/log[2^(1/6)]

    DWTELEM *buf;

    IDWTELEM *ibuf;

    int buf_x_offset;

    int buf_y_offset;

    int stride_line; ///< Stride measured in lines, not pixels.

    x_and_coeff * x_coeff;

    struct SubBand *parent;

    uint8_t state[/*7*2*/ 7 + 512][32];

}SubBand;

typedef struct Plane{

    int width;

    int height;

    SubBand band[MAX_DECOMPOSITIONS][4];

    int htaps;

    int8_t hcoeff[HTAPS_MAX/2];

    int diag_mc;

    int fast_mc;

    int last_htaps;

    int8_t last_hcoeff[HTAPS_MAX/2];

    int last_diag_mc;

}Plane;

typedef struct SnowContext{

    AVClass *class;

    AVCodecContext *avctx;

    RangeCoder c;

    DSPContext dsp;

    HpelDSPContext hdsp;

    VideoDSPContext vdsp;

    H264QpelContext h264qpel;

    SnowDWTContext dwt;

    AVFrame *new_picture;

    AVFrame *input_picture;              ///< new_picture with the internal linesizes

    AVFrame *current_picture;

    AVFrame *last_picture[MAX_REF_FRAMES];

    uint8_t *halfpel_plane[MAX_REF_FRAMES][4][4];

    AVFrame *mconly_picture;

//     uint8_t q_context[16];

    uint8_t header_state[32];

    uint8_t block_state[128 + 32*128];

    int keyframe;

    int always_reset;

    int version;

    int spatial_decomposition_type;

    int last_spatial_decomposition_type;

    int temporal_decomposition_type;

    int spatial_decomposition_count;

    int last_spatial_decomposition_count;

    int temporal_decomposition_count;

    int max_ref_frames;

    int ref_frames;

    int16_t (*ref_mvs[MAX_REF_FRAMES])[2];

    uint32_t *ref_scores[MAX_REF_FRAMES];

    DWTELEM *spatial_dwt_buffer;

    DWTELEM *temp_dwt_buffer;

    IDWTELEM *spatial_idwt_buffer;

    IDWTELEM *temp_idwt_buffer;

    int *run_buffer;

    int colorspace_type;

    int chroma_h_shift;

    int chroma_v_shift;

    int spatial_scalability;

    int qlog;

    int last_qlog;

    int lambda;

    int lambda2;

    int pass1_rc;

    int mv_scale;

    int last_mv_scale;

    int qbias;

    int last_qbias;

#define QBIAS_SHIFT 3

    int b_width;

    int b_height;

    int block_max_depth;

    int last_block_max_depth;

    int nb_planes;

    Plane plane[MAX_PLANES];

    BlockNode *block;

#define ME_CACHE_SIZE 1024

    unsigned me_cache[ME_CACHE_SIZE];

    unsigned me_cache_generation;

    slice_buffer sb;

    int memc_only;

    int no_bitstream;

    MpegEncContext m; // needed for motion estimation, should not be used for anything else, the idea is to eventually make the motion estimation independent of MpegEncContext, so this will be removed then (FIXME/XXX)

    uint8_t *scratchbuf;

    uint8_t *emu_edge_buffer;

}SnowContext;

/* Tables */

extern const uint8_t * const ff_obmc_tab[4];

extern uint8_t ff_qexp[QROOT];

extern int ff_scale_mv_ref[MAX_REF_FRAMES][MAX_REF_FRAMES];

/* C bits used by mmx/sse2/altivec */

static av_always_inline void snow_interleave_line_header(int * i, int width, IDWTELEM * low, IDWTELEM * high){

    (*i) = (width) - 2;

    if (width & 1){

        low[(*i)+1] = low[((*i)+1)>>1];

        (*i)--;

    }

}

static av_always_inline void snow_interleave_line_footer(int * i, IDWTELEM * low, IDWTELEM * high){

    for (; (*i)>=0; (*i)-=2){

        low[(*i)+1] = high[(*i)>>1];

        low[*i] = low[(*i)>>1];

    }

}

static av_always_inline void snow_horizontal_compose_lift_lead_out(int i, IDWTELEM * dst, IDWTELEM * src, IDWTELEM * ref, int width, int w, int lift_high, int mul, int add, int shift){

    for(; i

        dst[i] = src[i] - ((mul * (ref[i] + ref[i + 1]) + add) >> shift);

    }

    if((width^lift_high)&1){

        dst[w] = src[w] - ((mul * 2 * ref[w] + add) >> shift);

    }

}

static av_always_inline void snow_horizontal_compose_liftS_lead_out(int i, IDWTELEM * dst, IDWTELEM * src, IDWTELEM * ref, int width, int w){

        for(; i

            dst[i] = src[i] + ((ref[i] + ref[(i+1)]+W_BO + 4 * src[i]) >> W_BS);

        }

        if(width&1){

            dst[w] = src[w] + ((2 * ref[w] + W_BO + 4 * src[w]) >> W_BS);

        }

}

/* common code */

int ff_snow_common_init(AVCodecContext *avctx);

int ff_snow_common_init_after_header(AVCodecContext *avctx);

void ff_snow_common_end(SnowContext *s);

void ff_snow_release_buffer(AVCodecContext *avctx);

void ff_snow_reset_contexts(SnowContext *s);

int ff_snow_alloc_blocks(SnowContext *s);

int ff_snow_frame_start(SnowContext *s);

void ff_snow_pred_block(SnowContext *s, uint8_t *dst, uint8_t *tmp, ptrdiff_t stride,

                     int sx, int sy, int b_w, int b_h, BlockNode *block,

                     int plane_index, int w, int h);

/* common inline functions */

//XXX doublecheck all of them should stay inlined

static inline void snow_set_blocks(SnowContext *s, int level, int x, int y, int l, int cb, int cr, int mx, int my, int ref, int type){

    const int w= s->b_width << s->block_max_depth;

    const int rem_depth= s->block_max_depth - level;

    const int index= (x + y*w) << rem_depth;

    const int block_w= 1<

    BlockNode block;

    int i,j;

    block.color[0]= l;

    block.color[1]= cb;

    block.color[2]= cr;

    block.mx= mx;

    block.my= my;

    block.ref= ref;

    block.type= type;

    block.level= level;

    for(j=0; j

        for(i=0; i

            s->block[index + i + j*w]= block;

        }

    }

}

static inline void pred_mv(SnowContext *s, int *mx, int *my, int ref,

                           const BlockNode *left, const BlockNode *top, const BlockNode *tr){

    if(s->ref_frames == 1){

        *mx = mid_pred(left->mx, top->mx, tr->mx);

        *my = mid_pred(left->my, top->my, tr->my);

    }else{

        const int *scale = ff_scale_mv_ref[ref];

        *mx = mid_pred((left->mx * scale[left->ref] + 128) >>8,

                       (top ->mx * scale[top ->ref] + 128) >>8,

                       (tr  ->mx * scale[tr  ->ref] + 128) >>8);

        *my = mid_pred((left->my * scale[left->ref] + 128) >>8,

                       (top ->my * scale[top ->ref] + 128) >>8,

                       (tr  ->my * scale[tr  ->ref] + 128) >>8);

    }

}

static av_always_inline int same_block(BlockNode *a, BlockNode *b){

    if((a->type&BLOCK_INTRA) && (b->type&BLOCK_INTRA)){

        return !((a->color[0] - b->color[0]) | (a->color[1] - b->color[1]) | (a->color[2] - b->color[2]));

    }else{

        return !((a->mx - b->mx) | (a->my - b->my) | (a->ref - b->ref) | ((a->type ^ b->type)&BLOCK_INTRA));

    }

}

//FIXME name cleanup (b_w, block_w, b_width stuff)

//XXX should we really inline it?

static av_always_inline void add_yblock(SnowContext *s, int sliced, slice_buffer *sb, IDWTELEM *dst, uint8_t *dst8, const uint8_t *obmc, int src_x, int src_y, int b_w, int b_h, int w, int h, int dst_stride, int src_stride, int obmc_stride, int b_x, int b_y, int add, int offset_dst, int plane_index){

    const int b_width = s->b_width  << s->block_max_depth;

    const int b_height= s->b_height << s->block_max_depth;

    const int b_stride= b_width;

    BlockNode *lt= &s->block[b_x + b_y*b_stride];

    BlockNode *rt= lt+1;

    BlockNode *lb= lt+b_stride;

    BlockNode *rb= lb+1;

    uint8_t *block[4];

    int tmp_step= src_stride >= 7*MB_SIZE ? MB_SIZE : MB_SIZE*src_stride;

    uint8_t *tmp = s->scratchbuf;

    uint8_t *ptmp;

    int x,y;

    if(b_x<0){

        lt= rt;

        lb= rb;

    }else if(b_x + 1 >= b_width){

        rt= lt;

        rb= lb;

    }

    if(b_y<0){

        lt= lb;

        rt= rb;

    }else if(b_y + 1 >= b_height){

        lb= lt;

        rb= rt;

    }

    if(src_x<0){ //FIXME merge with prev & always round internal width up to *16

        obmc -= src_x;

        b_w += src_x;

        if(!sliced && !offset_dst)

            dst -= src_x;

        src_x=0;

    }else if(src_x + b_w > w){

        b_w = w - src_x;

    }

    if(src_y<0){

        obmc -= src_y*obmc_stride;

        b_h += src_y;

        if(!sliced && !offset_dst)

            dst -= src_y*dst_stride;

        src_y=0;

    }else if(src_y + b_h> h){

        b_h = h - src_y;

    }

    if(b_w<=0 || b_h<=0) return;

    av_assert2(src_stride > 2*MB_SIZE + 5);

    if(!sliced && offset_dst)

        dst += src_x + src_y*dst_stride;

    dst8+= src_x + src_y*src_stride;

//    src += src_x + src_y*src_stride;

    ptmp= tmp + 3*tmp_step;

    block[0]= ptmp;

    ptmp+=tmp_step;

    ff_snow_pred_block(s, block[0], tmp, src_stride, src_x, src_y, b_w, b_h, lt, plane_index, w, h);

    if(same_block(lt, rt)){

        block[1]= block[0];

    }else{

        block[1]= ptmp;

        ptmp+=tmp_step;

        ff_snow_pred_block(s, block[1], tmp, src_stride, src_x, src_y, b_w, b_h, rt, plane_index, w, h);

    }

    if(same_block(lt, lb)){

        block[2]= block[0];

    }else if(same_block(rt, lb)){

        block[2]= block[1];

    }else{

        block[2]= ptmp;

        ptmp+=tmp_step;

        ff_snow_pred_block(s, block[2], tmp, src_stride, src_x, src_y, b_w, b_h, lb, plane_index, w, h);

    }

    if(same_block(lt, rb) ){

        block[3]= block[0];

    }else if(same_block(rt, rb)){

        block[3]= block[1];

    }else if(same_block(lb, rb)){

        block[3]= block[2];

    }else{

        block[3]= ptmp;

        ff_snow_pred_block(s, block[3], tmp, src_stride, src_x, src_y, b_w, b_h, rb, plane_index, w, h);

    }

    if(sliced){

        s->dwt.inner_add_yblock(obmc, obmc_stride, block, b_w, b_h, src_x,src_y, src_stride, sb, add, dst8);

    }else{

        for(y=0; y

            //FIXME ugly misuse of obmc_stride

            const uint8_t *obmc1= obmc + y*obmc_stride;

            const uint8_t *obmc2= obmc1+ (obmc_stride>>1);

            const uint8_t *obmc3= obmc1+ obmc_stride*(obmc_stride>>1);

            const uint8_t *obmc4= obmc3+ (obmc_stride>>1);

            for(x=0; x

                int v=   obmc1[x] * block[3][x + y*src_stride]

                        +obmc2[x] * block[2][x + y*src_stride]

                        +obmc3[x] * block[1][x + y*src_stride]

                        +obmc4[x] * block[0][x + y*src_stride];

                v <<= 8 - LOG2_OBMC_MAX;

                if(FRAC_BITS != 8){

                    v >>= 8 - FRAC_BITS;

                }

                if(add){

                    v += dst[x + y*dst_stride];

                    v = (v + (1<<(FRAC_BITS-1))) >> FRAC_BITS;

                    if(v&(~255)) v= ~(v>>31);

                    dst8[x + y*src_stride] = v;

                }else{

                    dst[x + y*dst_stride] -= v;

                }

            }

        }

    }

}

static av_always_inline void predict_slice(SnowContext *s, IDWTELEM *buf, int plane_index, int add, int mb_y){

    Plane *p= &s->plane[plane_index];

    const int mb_w= s->b_width  << s->block_max_depth;

    const int mb_h= s->b_height << s->block_max_depth;

    int x, y, mb_x;

    int block_size = MB_SIZE >> s->block_max_depth;

    int block_w    = plane_index ? block_size>>s->chroma_h_shift : block_size;

    int block_h    = plane_index ? block_size>>s->chroma_v_shift : block_size;

    const uint8_t *obmc  = plane_index ? ff_obmc_tab[s->block_max_depth+s->chroma_h_shift] : ff_obmc_tab[s->block_max_depth];

    const int obmc_stride= plane_index ? (2*block_size)>>s->chroma_h_shift : 2*block_size;

    int ref_stride= s->current_picture->linesize[plane_index];

    uint8_t *dst8= s->current_picture->data[plane_index];

    int w= p->width;

    int h= p->height;

    av_assert2(s->chroma_h_shift == s->chroma_v_shift); // obmc params assume squares

    if(s->keyframe || (s->avctx->debug&512)){

        if(mb_y==mb_h)

            return;

        if(add){

            for(y=block_h*mb_y; y

                for(x=0; x

                    int v= buf[x + y*w] + (128<

                    v >>= FRAC_BITS;

                    if(v&(~255)) v= ~(v>>31);

                    dst8[x + y*ref_stride]= v;

                }

            }

        }else{

            for(y=block_h*mb_y; y

                for(x=0; x

                    buf[x + y*w]-= 128<

                }

            }

        }

        return;

    }

    for(mb_x=0; mb_x<=mb_w; mb_x++){

        add_yblock(s, 0, NULL, buf, dst8, obmc,

                   block_w*mb_x - block_w/2,

                   block_h*mb_y - block_h/2,

                   block_w, block_h,

                   w, h,

                   w, ref_stride, obmc_stride,

                   mb_x - 1, mb_y - 1,

                   add, 1, plane_index);

    }

}

static av_always_inline void predict_plane(SnowContext *s, IDWTELEM *buf, int plane_index, int add){

    const int mb_h= s->b_height << s->block_max_depth;

    int mb_y;

    for(mb_y=0; mb_y<=mb_h; mb_y++)

        predict_slice(s, buf, plane_index, add, mb_y);

}

static inline void set_blocks(SnowContext *s, int level, int x, int y, int l, int cb, int cr, int mx, int my, int ref, int type){

    const int w= s->b_width << s->block_max_depth;

    const int rem_depth= s->block_max_depth - level;

    const int index= (x + y*w) << rem_depth;

    const int block_w= 1<

    const int block_h= 1<

    BlockNode block;

    int i,j;

    block.color[0]= l;

    block.color[1]= cb;

    block.color[2]= cr;

    block.mx= mx;

    block.my= my;

    block.ref= ref;

    block.type= type;

    block.level= level;

    for(j=0; j

        for(i=0; i

            s->block[index + i + j*w]= block;

        }

    }

}

static inline void init_ref(MotionEstContext *c, uint8_t *src[3], uint8_t *ref[3], uint8_t *ref2[3], int x, int y, int ref_index){

    SnowContext *s = c->avctx->priv_data;

    const int offset[3]= {

          y*c->  stride + x,

        ((y*c->uvstride + x)>>s->chroma_h_shift),

        ((y*c->uvstride + x)>>s->chroma_h_shift),

    };

    int i;

    for(i=0; i<3; i++){

        c->src[0][i]= src [i];

        c->ref[0][i]= ref [i] + offset[i];

    }

    av_assert2(!ref_index);

}

/* bitstream functions */

extern const int8_t ff_quant3bA[256];

#define QEXPSHIFT (7-FRAC_BITS+8) //FIXME try to change this to 0

static inline void put_symbol(RangeCoder *c, uint8_t *state, int v, int is_signed){

    int i;

    if(v){

        const int a= FFABS(v);

        const int e= av_log2(a);

        const int el= FFMIN(e, 10);

        put_rac(c, state+0, 0);

        for(i=0; i

            put_rac(c, state+1+i, 1);  //1..10

        }

        for(; i

            put_rac(c, state+1+9, 1);  //1..10

        }

        put_rac(c, state+1+FFMIN(i,9), 0);

        for(i=e-1; i>=el; i--){

            put_rac(c, state+22+9, (a>>i)&1); //22..31

        }

        for(; i>=0; i--){

            put_rac(c, state+22+i, (a>>i)&1); //22..31

        }

        if(is_signed)

            put_rac(c, state+11 + el, v < 0); //11..21

    }else{

        put_rac(c, state+0, 1);

    }

}

static inline int get_symbol(RangeCoder *c, uint8_t *state, int is_signed){

    if(get_rac(c, state+0))

        return 0;

    else{

        int i, e, a;

        e= 0;

        while(get_rac(c, state+1 + FFMIN(e,9))){ //1..10

            e++;

        }

        a= 1;

        for(i=e-1; i>=0; i--){

            a += a + get_rac(c, state+22 + FFMIN(i,9)); //22..31

        }

        e= -(is_signed && get_rac(c, state+11 + FFMIN(e,10))); //11..21

        return (a^e)-e;

    }

}

static inline void put_symbol2(RangeCoder *c, uint8_t *state, int v, int log2){

    int i;

    int r= log2>=0 ? 1<

    av_assert2(v>=0);

    av_assert2(log2>=-4);

    while(v >= r){

        put_rac(c, state+4+log2, 1);

        v -= r;

        log2++;

        if(log2>0) r+=r;

    }

    put_rac(c, state+4+log2, 0);

    for(i=log2-1; i>=0; i--){

        put_rac(c, state+31-i, (v>>i)&1);

    }

}

static inline int get_symbol2(RangeCoder *c, uint8_t *state, int log2){

    int i;

    int r= log2>=0 ? 1<

    int v=0;

    av_assert2(log2>=-4);

    while(log2<28 && get_rac(c, state+4+log2)){

        v+= r;

        log2++;

        if(log2>0) r+=r;

    }

    for(i=log2-1; i>=0; i--){

        v+= get_rac(c, state+31-i)<

    }

    return v;

}

static inline void unpack_coeffs(SnowContext *s, SubBand *b, SubBand * parent, int orientation){

    const int w= b->width;

    const int h= b->height;

    int x,y;

    int run, runs;

    x_and_coeff *xc= b->x_coeff;

    x_and_coeff *prev_xc= NULL;

    x_and_coeff *prev2_xc= xc;

    x_and_coeff *parent_xc= parent ? parent->x_coeff : NULL;

    x_and_coeff *prev_parent_xc= parent_xc;

    runs= get_symbol2(&s->c, b->state[30], 0);

    if(runs-- > 0) run= get_symbol2(&s->c, b->state[1], 3);

    else           run= INT_MAX;

    for(y=0; y

        int v=0;

        int lt=0, t=0, rt=0;

        if(y && prev_xc->x == 0){

            rt= prev_xc->coeff;

        }

        for(x=0; x

            int p=0;

            const int l= v;

            lt= t; t= rt;

            if(y){

                if(prev_xc->x <= x)

                    prev_xc++;

                if(prev_xc->x == x + 1)

                    rt= prev_xc->coeff;

                else

                    rt=0;

            }

            if(parent_xc){

                if(x>>1 > parent_xc->x){

                    parent_xc++;

                }

                if(x>>1 == parent_xc->x){

                    p= parent_xc->coeff;

                }

            }

            if(/*ll|*/l|lt|t|rt|p){

                int context= av_log2(/*FFABS(ll) + */3*(l>>1) + (lt>>1) + (t&~1) + (rt>>1) + (p>>1));

                v=get_rac(&s->c, &b->state[0][context]);

                if(v){

                    v= 2*(get_symbol2(&s->c, b->state[context + 2], context-4) + 1);

                    v+=get_rac(&s->c, &b->state[0][16 + 1 + 3 + ff_quant3bA[l&0xFF] + 3*ff_quant3bA[t&0xFF]]);

                    xc->x=x;

                    (xc++)->coeff= v;

                }

            }else{

                if(!run){

                    if(runs-- > 0) run= get_symbol2(&s->c, b->state[1], 3);

                    else           run= INT_MAX;

                    v= 2*(get_symbol2(&s->c, b->state[0 + 2], 0-4) + 1);

                    v+=get_rac(&s->c, &b->state[0][16 + 1 + 3]);

                    xc->x=x;

                    (xc++)->coeff= v;

                }else{

                    int max_run;

                    run--;

                    v=0;

                    av_assert2(run >= 0);

                    if(y) max_run= FFMIN(run, prev_xc->x - x - 2);

                    else  max_run= FFMIN(run, w-x-1);

                    if(parent_xc)

                        max_run= FFMIN(max_run, 2*parent_xc->x - x - 1);

                    av_assert2(max_run >= 0 && max_run <= run);

                    x+= max_run;

                    run-= max_run;

                }

            }

        }

        (xc++)->x= w+1; //end marker

        prev_xc= prev2_xc;

        prev2_xc= xc;

        if(parent_xc){

            if(y&1){

                while(parent_xc->x != parent->width+1)

                    parent_xc++;

                parent_xc++;

                prev_parent_xc= parent_xc;

            }else{

                parent_xc= prev_parent_xc;

            }

        }

    }

    (xc++)->x= w+1; //end marker

}

#endif /* AVCODEC_SNOW_H */