/*
  * Copyright (C) 2004 Michael Niedermayer <michaelni@gmx.at>
  * Copyright (C) 2006 Robert Edele <yartrebo@earthlink.net>
  *

  * 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<<QSHIFT)
 #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<<LOG2_MB_SIZE)
 #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<w; 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<w; 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<<rem_depth;
     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<block_w; j++){
         for(i=0; i<block_w; 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;

     }
     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;

     }
     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<b_h; 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<b_w; 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<FFMIN(h,block_h*(mb_y+1)); y++){

                 for(x=0; x<w; x++){
                     int v= buf[x + y*w] + (128<<FRAC_BITS) + (1<<(FRAC_BITS-1));
                     v >>= FRAC_BITS;
                     if(v&(~255)) v= ~(v>>31);
                     dst8[x + y*ref_stride]= v;
                 }
             }
         }else{

             for(y=block_h*mb_y; y<FFMIN(h,block_h*(mb_y+1)); y++){

                 for(x=0; x<w; x++){
                     buf[x + y*w]-= 128<<FRAC_BITS;
                 }
             }
         }
 
         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<<rem_depth;

     const int block_h= 1<<rem_depth; //FIXME "w!=h"

     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<block_h; j++){

         for(i=0; i<block_w; 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<el; i++){
             put_rac(c, state+1+i, 1);  //1..10
         }
         for(; i<e; 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<<log2 : 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<<log2 : 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)<<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<h; 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<w; 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 */