Drop Snow codec

Snow is a toy codec with no real-world use and horrible code.

1 files changed, 0 insertions, 1939 deletions

diff --git a/libavcodec/snowenc.c b/libavcodec/snowenc.c
deleted file mode 100644
index f93c53f145..0000000000
--- a/libavcodec/snowenc.c
+++ /dev/null
@@ -1,1939 +0,0 @@
-/*
- * Copyright (C) 2004 Michael Niedermayer <michaelni@gmx.at>
- *
- * This file is part of Libav.
- *
- * Libav 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.
- *
- * Libav 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 Libav; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include "libavutil/intmath.h"
-#include "libavutil/log.h"
-#include "libavutil/opt.h"
-#include "avcodec.h"
-#include "dsputil.h"
-#include "internal.h"
-#include "dwt.h"
-#include "snow.h"
-
-#include "rangecoder.h"
-#include "mathops.h"
-
-#include "mpegvideo.h"
-#include "h263.h"
-
-#undef NDEBUG
-#include <assert.h>
-
-#define QUANTIZE2 0
-
-#if QUANTIZE2==1
-#define Q2_STEP 8
-
-static void find_sse(SnowContext *s, Plane *p, int *score, int score_stride, IDWTELEM *r0, IDWTELEM *r1, int level, int orientation){
-    SubBand *b= &p->band[level][orientation];
-    int x, y;
-    int xo=0;
-    int yo=0;
-    int step= 1 << (s->spatial_decomposition_count - level);
-
-    if(orientation&1)
-        xo= step>>1;
-    if(orientation&2)
-        yo= step>>1;
-
-    //FIXME bias for nonzero ?
-    //FIXME optimize
-    memset(score, 0, sizeof(*score)*score_stride*((p->height + Q2_STEP-1)/Q2_STEP));
-    for(y=0; y<p->height; y++){
-        for(x=0; x<p->width; x++){
-            int sx= (x-xo + step/2) / step / Q2_STEP;
-            int sy= (y-yo + step/2) / step / Q2_STEP;
-            int v= r0[x + y*p->width] - r1[x + y*p->width];
-            assert(sx>=0 && sy>=0 && sx < score_stride);
-            v= ((v+8)>>4)<<4;
-            score[sx + sy*score_stride] += v*v;
-            assert(score[sx + sy*score_stride] >= 0);
-        }
-    }
-}
-
-static void dequantize_all(SnowContext *s, Plane *p, IDWTELEM *buffer, int width, int height){
-    int level, orientation;
-
-    for(level=0; level<s->spatial_decomposition_count; level++){
-        for(orientation=level ? 1 : 0; orientation<4; orientation++){
-            SubBand *b= &p->band[level][orientation];
-            IDWTELEM *dst= buffer + (b->ibuf - s->spatial_idwt_buffer);
-
-            dequantize(s, b, dst, b->stride);
-        }
-    }
-}
-
-static void dwt_quantize(SnowContext *s, Plane *p, DWTELEM *buffer, int width, int height, int stride, int type){
-    int level, orientation, ys, xs, x, y, pass;
-    IDWTELEM best_dequant[height * stride];
-    IDWTELEM idwt2_buffer[height * stride];
-    const int score_stride= (width + 10)/Q2_STEP;
-    int best_score[(width + 10)/Q2_STEP * (height + 10)/Q2_STEP]; //FIXME size
-    int score[(width + 10)/Q2_STEP * (height + 10)/Q2_STEP]; //FIXME size
-    int threshold= (s->m.lambda * s->m.lambda) >> 6;
-
-    //FIXME pass the copy cleanly ?
-
-//    memcpy(dwt_buffer, buffer, height * stride * sizeof(DWTELEM));
-    ff_spatial_dwt(buffer, s->temp_dwt_buffer, width, height, stride, type, s->spatial_decomposition_count);
-
-    for(level=0; level<s->spatial_decomposition_count; level++){
-        for(orientation=level ? 1 : 0; orientation<4; orientation++){
-            SubBand *b= &p->band[level][orientation];
-            IDWTELEM *dst= best_dequant + (b->ibuf - s->spatial_idwt_buffer);
-             DWTELEM *src=       buffer + (b-> buf - s->spatial_dwt_buffer);
-            assert(src == b->buf); // code does not depend on this but it is true currently
-
-            quantize(s, b, dst, src, b->stride, s->qbias);
-        }
-    }
-    for(pass=0; pass<1; pass++){
-        if(s->qbias == 0) //keyframe
-            continue;
-        for(level=0; level<s->spatial_decomposition_count; level++){
-            for(orientation=level ? 1 : 0; orientation<4; orientation++){
-                SubBand *b= &p->band[level][orientation];
-                IDWTELEM *dst= idwt2_buffer + (b->ibuf - s->spatial_idwt_buffer);
-                IDWTELEM *best_dst= best_dequant + (b->ibuf - s->spatial_idwt_buffer);
-
-                for(ys= 0; ys<Q2_STEP; ys++){
-                    for(xs= 0; xs<Q2_STEP; xs++){
-                        memcpy(idwt2_buffer, best_dequant, height * stride * sizeof(IDWTELEM));
-                        dequantize_all(s, p, idwt2_buffer, width, height);
-                        ff_spatial_idwt(idwt2_buffer, s->temp_idwt_buffer, width, height, stride, type, s->spatial_decomposition_count);
-                        find_sse(s, p, best_score, score_stride, idwt2_buffer, s->spatial_idwt_buffer, level, orientation);
-                        memcpy(idwt2_buffer, best_dequant, height * stride * sizeof(IDWTELEM));
-                        for(y=ys; y<b->height; y+= Q2_STEP){
-                            for(x=xs; x<b->width; x+= Q2_STEP){
-                                if(dst[x + y*b->stride]<0) dst[x + y*b->stride]++;
-                                if(dst[x + y*b->stride]>0) dst[x + y*b->stride]--;
-                                //FIXME try more than just --
-                            }
-                        }
-                        dequantize_all(s, p, idwt2_buffer, width, height);
-                        ff_spatial_idwt(idwt2_buffer, s->temp_idwt_buffer, width, height, stride, type, s->spatial_decomposition_count);
-                        find_sse(s, p, score, score_stride, idwt2_buffer, s->spatial_idwt_buffer, level, orientation);
-                        for(y=ys; y<b->height; y+= Q2_STEP){
-                            for(x=xs; x<b->width; x+= Q2_STEP){
-                                int score_idx= x/Q2_STEP + (y/Q2_STEP)*score_stride;
-                                if(score[score_idx] <= best_score[score_idx] + threshold){
-                                    best_score[score_idx]= score[score_idx];
-                                    if(best_dst[x + y*b->stride]<0) best_dst[x + y*b->stride]++;
-                                    if(best_dst[x + y*b->stride]>0) best_dst[x + y*b->stride]--;
-                                    //FIXME copy instead
-                                }
-                            }
-                        }
-                    }
-                }
-            }
-        }
-    }
-    memcpy(s->spatial_idwt_buffer, best_dequant, height * stride * sizeof(IDWTELEM)); //FIXME work with that directly instead of copy at the end
-}
-
-#endif /* QUANTIZE2==1 */
-
-static av_cold int encode_init(AVCodecContext *avctx)
-{
-    SnowContext *s = avctx->priv_data;
-    int plane_index, ret;
-
-    if(avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
-        av_log(avctx, AV_LOG_ERROR, "This codec is under development, files encoded with it may not be decodable with future versions!!!\n"
-               "Use vstrict=-2 / -strict -2 to use it anyway.\n");
-        return -1;
-    }
-
-    if(avctx->prediction_method == DWT_97
-       && (avctx->flags & CODEC_FLAG_QSCALE)
-       && avctx->global_quality == 0){
-        av_log(avctx, AV_LOG_ERROR, "The 9/7 wavelet is incompatible with lossless mode.\n");
-        return -1;
-    }
-
-    s->spatial_decomposition_type= avctx->prediction_method; //FIXME add decorrelator type r transform_type
-
-    s->mv_scale       = (avctx->flags & CODEC_FLAG_QPEL) ? 2 : 4;
-    s->block_max_depth= (avctx->flags & CODEC_FLAG_4MV ) ? 1 : 0;
-
-    for(plane_index=0; plane_index<3; plane_index++){
-        s->plane[plane_index].diag_mc= 1;
-        s->plane[plane_index].htaps= 6;
-        s->plane[plane_index].hcoeff[0]=  40;
-        s->plane[plane_index].hcoeff[1]= -10;
-        s->plane[plane_index].hcoeff[2]=   2;
-        s->plane[plane_index].fast_mc= 1;
-    }
-
-    if ((ret = ff_snow_common_init(avctx)) < 0) {
-        ff_snow_common_end(avctx->priv_data);
-        return ret;
-    }
-    ff_snow_alloc_blocks(s);
-
-    s->version=0;
-
-    s->m.avctx   = avctx;
-    s->m.flags   = avctx->flags;
-    s->m.bit_rate= avctx->bit_rate;
-
-    s->m.me.temp      =
-    s->m.me.scratchpad= av_mallocz((avctx->width+64)*2*16*2*sizeof(uint8_t));
-    s->m.me.map       = av_mallocz(ME_MAP_SIZE*sizeof(uint32_t));
-    s->m.me.score_map = av_mallocz(ME_MAP_SIZE*sizeof(uint32_t));
-    s->m.obmc_scratchpad= av_mallocz(MB_SIZE*MB_SIZE*12*sizeof(uint32_t));
-    ff_h263_encode_init(&s->m); //mv_penalty
-
-    s->max_ref_frames = FFMAX(FFMIN(avctx->refs, MAX_REF_FRAMES), 1);
-
-    if(avctx->flags&CODEC_FLAG_PASS1){
-        if(!avctx->stats_out)
-            avctx->stats_out = av_mallocz(256);
-    }
-    if((avctx->flags&CODEC_FLAG_PASS2) || !(avctx->flags&CODEC_FLAG_QSCALE)){
-        if(ff_rate_control_init(&s->m) < 0)
-            return -1;
-    }
-    s->pass1_rc= !(avctx->flags & (CODEC_FLAG_QSCALE|CODEC_FLAG_PASS2));
-
-    avctx->coded_frame= &s->current_picture;
-    switch(avctx->pix_fmt){
-//    case AV_PIX_FMT_YUV444P:
-//    case AV_PIX_FMT_YUV422P:
-    case AV_PIX_FMT_YUV420P:
-    case AV_PIX_FMT_GRAY8:
-//    case AV_PIX_FMT_YUV411P:
-//    case AV_PIX_FMT_YUV410P:
-        s->colorspace_type= 0;
-        break;
-/*    case AV_PIX_FMT_RGB32:
-        s->colorspace= 1;
-        break;*/
-    default:
-        av_log(avctx, AV_LOG_ERROR, "pixel format not supported\n");
-        return -1;
-    }
-//    avcodec_get_chroma_sub_sample(avctx->pix_fmt, &s->chroma_h_shift, &s->chroma_v_shift);
-    s->chroma_h_shift= 1;
-    s->chroma_v_shift= 1;
-
-    ff_set_cmp(&s->dsp, s->dsp.me_cmp, s->avctx->me_cmp);
-    ff_set_cmp(&s->dsp, s->dsp.me_sub_cmp, s->avctx->me_sub_cmp);
-
-    ff_get_buffer(s->avctx, &s->input_picture);
-
-    if(s->avctx->me_method == ME_ITER){
-        int i;
-        int size= s->b_width * s->b_height << 2*s->block_max_depth;
-        for(i=0; i<s->max_ref_frames; i++){
-            s->ref_mvs[i]= av_mallocz(size*sizeof(int16_t[2]));
-            s->ref_scores[i]= av_mallocz(size*sizeof(uint32_t));
-        }
-    }
-
-    return 0;
-}
-
-//near copy & paste from dsputil, FIXME
-static int pix_sum(uint8_t * pix, int line_size, int w)
-{
-    int s, i, j;
-
-    s = 0;
-    for (i = 0; i < w; i++) {
-        for (j = 0; j < w; j++) {
-            s += pix[0];
-            pix ++;
-        }
-        pix += line_size - w;
-    }
-    return s;
-}
-
-//near copy & paste from dsputil, FIXME
-static int pix_norm1(uint8_t * pix, int line_size, int w)
-{
-    int s, i, j;
-    uint32_t *sq = ff_squareTbl + 256;
-
-    s = 0;
-    for (i = 0; i < w; i++) {
-        for (j = 0; j < w; j ++) {
-            s += sq[pix[0]];
-            pix ++;
-        }
-        pix += line_size - w;
-    }
-    return s;
-}
-
-//FIXME copy&paste
-#define P_LEFT P[1]
-#define P_TOP P[2]
-#define P_TOPRIGHT P[3]
-#define P_MEDIAN P[4]
-#define P_MV1 P[9]
-#define FLAG_QPEL   1 //must be 1
-
-static int encode_q_branch(SnowContext *s, int level, int x, int y){
-    uint8_t p_buffer[1024];
-    uint8_t i_buffer[1024];
-    uint8_t p_state[sizeof(s->block_state)];
-    uint8_t i_state[sizeof(s->block_state)];
-    RangeCoder pc, ic;
-    uint8_t *pbbak= s->c.bytestream;
-    uint8_t *pbbak_start= s->c.bytestream_start;
-    int score, score2, iscore, i_len, p_len, block_s, sum, base_bits;
-    const int w= s->b_width  << s->block_max_depth;
-    const int h= s->b_height << 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<<(LOG2_MB_SIZE - level);
-    int trx= (x+1)<<rem_depth;
-    int try= (y+1)<<rem_depth;
-    const BlockNode *left  = x ? &s->block[index-1] : &null_block;
-    const BlockNode *top   = y ? &s->block[index-w] : &null_block;
-    const BlockNode *right = trx<w ? &s->block[index+1] : &null_block;
-    const BlockNode *bottom= try<h ? &s->block[index+w] : &null_block;
-    const BlockNode *tl    = y && x ? &s->block[index-w-1] : left;
-    const BlockNode *tr    = y && trx<w && ((x&1)==0 || level==0) ? &s->block[index-w+(1<<rem_depth)] : tl; //FIXME use lt
-    int pl = left->color[0];
-    int pcb= left->color[1];
-    int pcr= left->color[2];
-    int pmx, pmy;
-    int mx=0, my=0;
-    int l,cr,cb;
-    const int stride= s->current_picture.linesize[0];
-    const int uvstride= s->current_picture.linesize[1];
-    uint8_t *current_data[3]= { s->input_picture.data[0] + (x + y*  stride)*block_w,
-                                s->input_picture.data[1] + (x + y*uvstride)*block_w/2,
-                                s->input_picture.data[2] + (x + y*uvstride)*block_w/2};
-    int P[10][2];
-    int16_t last_mv[3][2];
-    int qpel= !!(s->avctx->flags & CODEC_FLAG_QPEL); //unused
-    const int shift= 1+qpel;
-    MotionEstContext *c= &s->m.me;
-    int ref_context= av_log2(2*left->ref) + av_log2(2*top->ref);
-    int mx_context= av_log2(2*FFABS(left->mx - top->mx));
-    int my_context= av_log2(2*FFABS(left->my - top->my));
-    int s_context= 2*left->level + 2*top->level + tl->level + tr->level;
-    int ref, best_ref, ref_score, ref_mx, ref_my;
-
-    assert(sizeof(s->block_state) >= 256);
-    if(s->keyframe){
-        set_blocks(s, level, x, y, pl, pcb, pcr, 0, 0, 0, BLOCK_INTRA);
-        return 0;
-    }
-
-//    clip predictors / edge ?
-
-    P_LEFT[0]= left->mx;
-    P_LEFT[1]= left->my;
-    P_TOP [0]= top->mx;
-    P_TOP [1]= top->my;
-    P_TOPRIGHT[0]= tr->mx;
-    P_TOPRIGHT[1]= tr->my;
-
-    last_mv[0][0]= s->block[index].mx;
-    last_mv[0][1]= s->block[index].my;
-    last_mv[1][0]= right->mx;
-    last_mv[1][1]= right->my;
-    last_mv[2][0]= bottom->mx;
-    last_mv[2][1]= bottom->my;
-
-    s->m.mb_stride=2;
-    s->m.mb_x=
-    s->m.mb_y= 0;
-    c->skip= 0;
-
-    assert(c->  stride ==   stride);
-    assert(c->uvstride == uvstride);
-
-    c->penalty_factor    = get_penalty_factor(s->lambda, s->lambda2, c->avctx->me_cmp);
-    c->sub_penalty_factor= get_penalty_factor(s->lambda, s->lambda2, c->avctx->me_sub_cmp);
-    c->mb_penalty_factor = get_penalty_factor(s->lambda, s->lambda2, c->avctx->mb_cmp);
-    c->current_mv_penalty= c->mv_penalty[s->m.f_code=1] + MAX_MV;
-
-    c->xmin = - x*block_w - 16+3;
-    c->ymin = - y*block_w - 16+3;
-    c->xmax = - (x+1)*block_w + (w<<(LOG2_MB_SIZE - s->block_max_depth)) + 16-3;
-    c->ymax = - (y+1)*block_w + (h<<(LOG2_MB_SIZE - s->block_max_depth)) + 16-3;
-
-    if(P_LEFT[0]     > (c->xmax<<shift)) P_LEFT[0]    = (c->xmax<<shift);
-    if(P_LEFT[1]     > (c->ymax<<shift)) P_LEFT[1]    = (c->ymax<<shift);
-    if(P_TOP[0]      > (c->xmax<<shift)) P_TOP[0]     = (c->xmax<<shift);
-    if(P_TOP[1]      > (c->ymax<<shift)) P_TOP[1]     = (c->ymax<<shift);
-    if(P_TOPRIGHT[0] < (c->xmin<<shift)) P_TOPRIGHT[0]= (c->xmin<<shift);
-    if(P_TOPRIGHT[0] > (c->xmax<<shift)) P_TOPRIGHT[0]= (c->xmax<<shift); //due to pmx no clip
-    if(P_TOPRIGHT[1] > (c->ymax<<shift)) P_TOPRIGHT[1]= (c->ymax<<shift);
-
-    P_MEDIAN[0]= mid_pred(P_LEFT[0], P_TOP[0], P_TOPRIGHT[0]);
-    P_MEDIAN[1]= mid_pred(P_LEFT[1], P_TOP[1], P_TOPRIGHT[1]);
-
-    if (!y) {
-        c->pred_x= P_LEFT[0];
-        c->pred_y= P_LEFT[1];
-    } else {
-        c->pred_x = P_MEDIAN[0];
-        c->pred_y = P_MEDIAN[1];
-    }
-
-    score= INT_MAX;
-    best_ref= 0;
-    for(ref=0; ref<s->ref_frames; ref++){
-        init_ref(c, current_data, s->last_picture[ref].data, NULL, block_w*x, block_w*y, 0);
-
-        ref_score= ff_epzs_motion_search(&s->m, &ref_mx, &ref_my, P, 0, /*ref_index*/ 0, last_mv,
-                                         (1<<16)>>shift, level-LOG2_MB_SIZE+4, block_w);
-
-        assert(ref_mx >= c->xmin);
-        assert(ref_mx <= c->xmax);
-        assert(ref_my >= c->ymin);
-        assert(ref_my <= c->ymax);
-
-        ref_score= c->sub_motion_search(&s->m, &ref_mx, &ref_my, ref_score, 0, 0, level-LOG2_MB_SIZE+4, block_w);
-        ref_score= ff_get_mb_score(&s->m, ref_mx, ref_my, 0, 0, level-LOG2_MB_SIZE+4, block_w, 0);
-        ref_score+= 2*av_log2(2*ref)*c->penalty_factor;
-        if(s->ref_mvs[ref]){
-            s->ref_mvs[ref][index][0]= ref_mx;
-            s->ref_mvs[ref][index][1]= ref_my;
-            s->ref_scores[ref][index]= ref_score;
-        }
-        if(score > ref_score){
-            score= ref_score;
-            best_ref= ref;
-            mx= ref_mx;
-            my= ref_my;
-        }
-    }
-    //FIXME if mb_cmp != SSE then intra cannot be compared currently and mb_penalty vs. lambda2
-
-  //  subpel search
-    base_bits= get_rac_count(&s->c) - 8*(s->c.bytestream - s->c.bytestream_start);
-    pc= s->c;
-    pc.bytestream_start=
-    pc.bytestream= p_buffer; //FIXME end/start? and at the other stoo
-    memcpy(p_state, s->block_state, sizeof(s->block_state));
-
-    if(level!=s->block_max_depth)
-        put_rac(&pc, &p_state[4 + s_context], 1);
-    put_rac(&pc, &p_state[1 + left->type + top->type], 0);
-    if(s->ref_frames > 1)
-        put_symbol(&pc, &p_state[128 + 1024 + 32*ref_context], best_ref, 0);
-    pred_mv(s, &pmx, &pmy, best_ref, left, top, tr);
-    put_symbol(&pc, &p_state[128 + 32*(mx_context + 16*!!best_ref)], mx - pmx, 1);
-    put_symbol(&pc, &p_state[128 + 32*(my_context + 16*!!best_ref)], my - pmy, 1);
-    p_len= pc.bytestream - pc.bytestream_start;
-    score += (s->lambda2*(get_rac_count(&pc)-base_bits))>>FF_LAMBDA_SHIFT;
-
-    block_s= block_w*block_w;
-    sum = pix_sum(current_data[0], stride, block_w);
-    l= (sum + block_s/2)/block_s;
-    iscore = pix_norm1(current_data[0], stride, block_w) - 2*l*sum + l*l*block_s;
-
-    block_s= block_w*block_w>>2;
-    sum = pix_sum(current_data[1], uvstride, block_w>>1);
-    cb= (sum + block_s/2)/block_s;
-//    iscore += pix_norm1(&current_mb[1][0], uvstride, block_w>>1) - 2*cb*sum + cb*cb*block_s;
-    sum = pix_sum(current_data[2], uvstride, block_w>>1);
-    cr= (sum + block_s/2)/block_s;
-//    iscore += pix_norm1(&current_mb[2][0], uvstride, block_w>>1) - 2*cr*sum + cr*cr*block_s;
-
-    ic= s->c;
-    ic.bytestream_start=
-    ic.bytestream= i_buffer; //FIXME end/start? and at the other stoo
-    memcpy(i_state, s->block_state, sizeof(s->block_state));
-    if(level!=s->block_max_depth)
-        put_rac(&ic, &i_state[4 + s_context], 1);
-    put_rac(&ic, &i_state[1 + left->type + top->type], 1);
-    put_symbol(&ic, &i_state[32],  l-pl , 1);
-    put_symbol(&ic, &i_state[64], cb-pcb, 1);
-    put_symbol(&ic, &i_state[96], cr-pcr, 1);
-    i_len= ic.bytestream - ic.bytestream_start;
-    iscore += (s->lambda2*(get_rac_count(&ic)-base_bits))>>FF_LAMBDA_SHIFT;
-
-//    assert(score==256*256*256*64-1);
-    assert(iscore < 255*255*256 + s->lambda2*10);
-    assert(iscore >= 0);
-    assert(l>=0 && l<=255);
-    assert(pl>=0 && pl<=255);
-
-    if(level==0){
-        int varc= iscore >> 8;
-        int vard= score >> 8;
-        if (vard <= 64 || vard < varc)
-            c->scene_change_score+= ff_sqrt(vard) - ff_sqrt(varc);
-        else
-            c->scene_change_score+= s->m.qscale;
-    }
-
-    if(level!=s->block_max_depth){
-        put_rac(&s->c, &s->block_state[4 + s_context], 0);
-        score2 = encode_q_branch(s, level+1, 2*x+0, 2*y+0);
-        score2+= encode_q_branch(s, level+1, 2*x+1, 2*y+0);
-        score2+= encode_q_branch(s, level+1, 2*x+0, 2*y+1);
-        score2+= encode_q_branch(s, level+1, 2*x+1, 2*y+1);
-        score2+= s->lambda2>>FF_LAMBDA_SHIFT; //FIXME exact split overhead
-
-        if(score2 < score && score2 < iscore)
-            return score2;
-    }
-
-    if(iscore < score){
-        pred_mv(s, &pmx, &pmy, 0, left, top, tr);
-        memcpy(pbbak, i_buffer, i_len);
-        s->c= ic;
-        s->c.bytestream_start= pbbak_start;
-        s->c.bytestream= pbbak + i_len;
-        set_blocks(s, level, x, y, l, cb, cr, pmx, pmy, 0, BLOCK_INTRA);
-        memcpy(s->block_state, i_state, sizeof(s->block_state));
-        return iscore;
-    }else{
-        memcpy(pbbak, p_buffer, p_len);
-        s->c= pc;
-        s->c.bytestream_start= pbbak_start;
-        s->c.bytestream= pbbak + p_len;
-        set_blocks(s, level, x, y, pl, pcb, pcr, mx, my, best_ref, 0);
-        memcpy(s->block_state, p_state, sizeof(s->block_state));
-        return score;
-    }
-}
-
-static void encode_q_branch2(SnowContext *s, int level, int x, int y){
-    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;
-    int trx= (x+1)<<rem_depth;
-    BlockNode *b= &s->block[index];
-    const BlockNode *left  = x ? &s->block[index-1] : &null_block;
-    const BlockNode *top   = y ? &s->block[index-w] : &null_block;
-    const BlockNode *tl    = y && x ? &s->block[index-w-1] : left;
-    const BlockNode *tr    = y && trx<w && ((x&1)==0 || level==0) ? &s->block[index-w+(1<<rem_depth)] : tl; //FIXME use lt
-    int pl = left->color[0];
-    int pcb= left->color[1];
-    int pcr= left->color[2];
-    int pmx, pmy;
-    int ref_context= av_log2(2*left->ref) + av_log2(2*top->ref);
-    int mx_context= av_log2(2*FFABS(left->mx - top->mx)) + 16*!!b->ref;
-    int my_context= av_log2(2*FFABS(left->my - top->my)) + 16*!!b->ref;
-    int s_context= 2*left->level + 2*top->level + tl->level + tr->level;
-
-    if(s->keyframe){
-        set_blocks(s, level, x, y, pl, pcb, pcr, 0, 0, 0, BLOCK_INTRA);
-        return;
-    }
-
-    if(level!=s->block_max_depth){
-        if(same_block(b,b+1) && same_block(b,b+w) && same_block(b,b+w+1)){
-            put_rac(&s->c, &s->block_state[4 + s_context], 1);
-        }else{
-            put_rac(&s->c, &s->block_state[4 + s_context], 0);
-            encode_q_branch2(s, level+1, 2*x+0, 2*y+0);
-            encode_q_branch2(s, level+1, 2*x+1, 2*y+0);
-            encode_q_branch2(s, level+1, 2*x+0, 2*y+1);
-            encode_q_branch2(s, level+1, 2*x+1, 2*y+1);
-            return;
-        }
-    }
-    if(b->type & BLOCK_INTRA){
-        pred_mv(s, &pmx, &pmy, 0, left, top, tr);
-        put_rac(&s->c, &s->block_state[1 + (left->type&1) + (top->type&1)], 1);
-        put_symbol(&s->c, &s->block_state[32], b->color[0]-pl , 1);
-        put_symbol(&s->c, &s->block_state[64], b->color[1]-pcb, 1);
-        put_symbol(&s->c, &s->block_state[96], b->color[2]-pcr, 1);
-        set_blocks(s, level, x, y, b->color[0], b->color[1], b->color[2], pmx, pmy, 0, BLOCK_INTRA);
-    }else{
-        pred_mv(s, &pmx, &pmy, b->ref, left, top, tr);
-        put_rac(&s->c, &s->block_state[1 + (left->type&1) + (top->type&1)], 0);
-        if(s->ref_frames > 1)
-            put_symbol(&s->c, &s->block_state[128 + 1024 + 32*ref_context], b->ref, 0);
-        put_symbol(&s->c, &s->block_state[128 + 32*mx_context], b->mx - pmx, 1);
-        put_symbol(&s->c, &s->block_state[128 + 32*my_context], b->my - pmy, 1);
-        set_blocks(s, level, x, y, pl, pcb, pcr, b->mx, b->my, b->ref, 0);
-    }
-}
-
-static int get_dc(SnowContext *s, int mb_x, int mb_y, int plane_index){
-    int i, x2, y2;
-    Plane *p= &s->plane[plane_index];
-    const int block_size = MB_SIZE >> s->block_max_depth;
-    const int block_w    = plane_index ? block_size/2 : block_size;
-    const uint8_t *obmc  = plane_index ? ff_obmc_tab[s->block_max_depth+1] : ff_obmc_tab[s->block_max_depth];
-    const int obmc_stride= plane_index ? block_size : 2*block_size;
-    const int ref_stride= s->current_picture.linesize[plane_index];
-    uint8_t *src= s-> input_picture.data[plane_index];
-    IDWTELEM *dst= (IDWTELEM*)s->m.obmc_scratchpad + plane_index*block_size*block_size*4; //FIXME change to unsigned
-    const int b_stride = s->b_width << s->block_max_depth;
-    const int w= p->width;
-    const int h= p->height;
-    int index= mb_x + mb_y*b_stride;
-    BlockNode *b= &s->block[index];
-    BlockNode backup= *b;
-    int ab=0;
-    int aa=0;
-
-    b->type|= BLOCK_INTRA;
-    b->color[plane_index]= 0;
-    memset(dst, 0, obmc_stride*obmc_stride*sizeof(IDWTELEM));
-
-    for(i=0; i<4; i++){
-        int mb_x2= mb_x + (i &1) - 1;
-        int mb_y2= mb_y + (i>>1) - 1;
-        int x= block_w*mb_x2 + block_w/2;
-        int y= block_w*mb_y2 + block_w/2;
-
-        add_yblock(s, 0, NULL, dst + ((i&1)+(i>>1)*obmc_stride)*block_w, NULL, obmc,
-                    x, y, block_w, block_w, w, h, obmc_stride, ref_stride, obmc_stride, mb_x2, mb_y2, 0, 0, plane_index);
-
-        for(y2= FFMAX(y, 0); y2<FFMIN(h, y+block_w); y2++){
-            for(x2= FFMAX(x, 0); x2<FFMIN(w, x+block_w); x2++){
-                int index= x2-(block_w*mb_x - block_w/2) + (y2-(block_w*mb_y - block_w/2))*obmc_stride;
-                int obmc_v= obmc[index];
-                int d;
-                if(y<0) obmc_v += obmc[index + block_w*obmc_stride];
-                if(x<0) obmc_v += obmc[index + block_w];
-                if(y+block_w>h) obmc_v += obmc[index - block_w*obmc_stride];
-                if(x+block_w>w) obmc_v += obmc[index - block_w];
-                //FIXME precalculate this or simplify it somehow else
-
-                d = -dst[index] + (1<<(FRAC_BITS-1));
-                dst[index] = d;
-                ab += (src[x2 + y2*ref_stride] - (d>>FRAC_BITS)) * obmc_v;
-                aa += obmc_v * obmc_v; //FIXME precalculate this
-            }
-        }
-    }
-    *b= backup;
-
-    return av_clip(((ab<<LOG2_OBMC_MAX) + aa/2)/aa, 0, 255); //FIXME we should not need clipping
-}
-
-static inline int get_block_bits(SnowContext *s, int x, int y, int w){
-    const int b_stride = s->b_width << s->block_max_depth;
-    const int b_height = s->b_height<< s->block_max_depth;
-    int index= x + y*b_stride;
-    const BlockNode *b     = &s->block[index];
-    const BlockNode *left  = x ? &s->block[index-1] : &null_block;
-    const BlockNode *top   = y ? &s->block[index-b_stride] : &null_block;
-    const BlockNode *tl    = y && x ? &s->block[index-b_stride-1] : left;
-    const BlockNode *tr    = y && x+w<b_stride ? &s->block[index-b_stride+w] : tl;
-    int dmx, dmy;
-//  int mx_context= av_log2(2*FFABS(left->mx - top->mx));
-//  int my_context= av_log2(2*FFABS(left->my - top->my));
-
-    if(x<0 || x>=b_stride || y>=b_height)
-        return 0;
-/*
-1            0      0
-01X          1-2    1
-001XX        3-6    2-3
-0001XXX      7-14   4-7
-00001XXXX   15-30   8-15
-*/
-//FIXME try accurate rate
-//FIXME intra and inter predictors if surrounding blocks are not the same type
-    if(b->type & BLOCK_INTRA){
-        return 3+2*( av_log2(2*FFABS(left->color[0] - b->color[0]))
-                   + av_log2(2*FFABS(left->color[1] - b->color[1]))
-                   + av_log2(2*FFABS(left->color[2] - b->color[2])));
-    }else{
-        pred_mv(s, &dmx, &dmy, b->ref, left, top, tr);
-        dmx-= b->mx;
-        dmy-= b->my;
-        return 2*(1 + av_log2(2*FFABS(dmx)) //FIXME kill the 2* can be merged in lambda
-                    + av_log2(2*FFABS(dmy))
-                    + av_log2(2*b->ref));
-    }
-}
-
-static int get_block_rd(SnowContext *s, int mb_x, int mb_y, int plane_index, uint8_t (*obmc_edged)[MB_SIZE * 2]){
-    Plane *p= &s->plane[plane_index];
-    const int block_size = MB_SIZE >> s->block_max_depth;
-    const int block_w    = plane_index ? block_size/2 : block_size;
-    const int obmc_stride= plane_index ? block_size : 2*block_size;
-    const int ref_stride= s->current_picture.linesize[plane_index];
-    uint8_t *dst= s->current_picture.data[plane_index];
-    uint8_t *src= s->  input_picture.data[plane_index];
-    IDWTELEM *pred= (IDWTELEM*)s->m.obmc_scratchpad + plane_index*block_size*block_size*4;
-    uint8_t *cur = s->scratchbuf;
-    uint8_t *tmp = s->emu_edge_buffer;
-    const int b_stride = s->b_width << s->block_max_depth;
-    const int b_height = s->b_height<< s->block_max_depth;
-    const int w= p->width;
-    const int h= p->height;
-    int distortion;
-    int rate= 0;
-    const int penalty_factor= get_penalty_factor(s->lambda, s->lambda2, s->avctx->me_cmp);
-    int sx= block_w*mb_x - block_w/2;
-    int sy= block_w*mb_y - block_w/2;
-    int x0= FFMAX(0,-sx);
-    int y0= FFMAX(0,-sy);
-    int x1= FFMIN(block_w*2, w-sx);
-    int y1= FFMIN(block_w*2, h-sy);
-    int i,x,y;
-
-    ff_snow_pred_block(s, cur, tmp, ref_stride, sx, sy, block_w*2, block_w*2, &s->block[mb_x + mb_y*b_stride], plane_index, w, h);
-
-    for(y=y0; y<y1; y++){
-        const uint8_t *obmc1= obmc_edged[y];
-        const IDWTELEM *pred1 = pred + y*obmc_stride;
-        uint8_t *cur1 = cur + y*ref_stride;
-        uint8_t *dst1 = dst + sx + (sy+y)*ref_stride;
-        for(x=x0; x<x1; x++){
-#if FRAC_BITS >= LOG2_OBMC_MAX
-            int v = (cur1[x] * obmc1[x]) << (FRAC_BITS - LOG2_OBMC_MAX);
-#else
-            int v = (cur1[x] * obmc1[x] + (1<<(LOG2_OBMC_MAX - FRAC_BITS-1))) >> (LOG2_OBMC_MAX - FRAC_BITS);
-#endif
-            v = (v + pred1[x]) >> FRAC_BITS;
-            if(v&(~255)) v= ~(v>>31);
-            dst1[x] = v;
-        }
-    }
-
-    /* copy the regions where obmc[] = (uint8_t)256 */
-    if(LOG2_OBMC_MAX == 8
-        && (mb_x == 0 || mb_x == b_stride-1)
-        && (mb_y == 0 || mb_y == b_height-1)){
-        if(mb_x == 0)
-            x1 = block_w;
-        else
-            x0 = block_w;
-        if(mb_y == 0)
-            y1 = block_w;
-        else
-            y0 = block_w;
-        for(y=y0; y<y1; y++)
-            memcpy(dst + sx+x0 + (sy+y)*ref_stride, cur + x0 + y*ref_stride, x1-x0);
-    }
-
-    if(block_w==16){
-        /* FIXME rearrange dsputil to fit 32x32 cmp functions */
-        /* FIXME check alignment of the cmp wavelet vs the encoding wavelet */
-        /* FIXME cmps overlap but do not cover the wavelet's whole support.
-         * So improving the score of one block is not strictly guaranteed
-         * to improve the score of the whole frame, thus iterative motion
-         * estimation does not always converge. */
-        if(s->avctx->me_cmp == FF_CMP_W97)
-            distortion = ff_w97_32_c(&s->m, src + sx + sy*ref_stride, dst + sx + sy*ref_stride, ref_stride, 32);
-        else if(s->avctx->me_cmp == FF_CMP_W53)
-            distortion = ff_w53_32_c(&s->m, src + sx + sy*ref_stride, dst + sx + sy*ref_stride, ref_stride, 32);
-        else{
-            distortion = 0;
-            for(i=0; i<4; i++){
-                int off = sx+16*(i&1) + (sy+16*(i>>1))*ref_stride;
-                distortion += s->dsp.me_cmp[0](&s->m, src + off, dst + off, ref_stride, 16);
-            }
-        }
-    }else{
-        assert(block_w==8);
-        distortion = s->dsp.me_cmp[0](&s->m, src + sx + sy*ref_stride, dst + sx + sy*ref_stride, ref_stride, block_w*2);
-    }
-
-    if(plane_index==0){
-        for(i=0; i<4; i++){
-/* ..RRr
- * .RXx.
- * rxx..
- */
-            rate += get_block_bits(s, mb_x + (i&1) - (i>>1), mb_y + (i>>1), 1);
-        }
-        if(mb_x == b_stride-2)
-            rate += get_block_bits(s, mb_x + 1, mb_y + 1, 1);
-    }
-    return distortion + rate*penalty_factor;
-}
-
-static int get_4block_rd(SnowContext *s, int mb_x, int mb_y, int plane_index){
-    int i, y2;
-    Plane *p= &s->plane[plane_index];
-    const int block_size = MB_SIZE >> s->block_max_depth;
-    const int block_w    = plane_index ? block_size/2 : block_size;
-    const uint8_t *obmc  = plane_index ? ff_obmc_tab[s->block_max_depth+1] : ff_obmc_tab[s->block_max_depth];
-    const int obmc_stride= plane_index ? block_size : 2*block_size;
-    const int ref_stride= s->current_picture.linesize[plane_index];
-    uint8_t *dst= s->current_picture.data[plane_index];
-    uint8_t *src= s-> input_picture.data[plane_index];
-    //FIXME zero_dst is const but add_yblock changes dst if add is 0 (this is never the case for dst=zero_dst
-    // const has only been removed from zero_dst to suppress a warning
-    static IDWTELEM zero_dst[4096]; //FIXME
-    const int b_stride = s->b_width << s->block_max_depth;
-    const int w= p->width;
-    const int h= p->height;
-    int distortion= 0;
-    int rate= 0;
-    const int penalty_factor= get_penalty_factor(s->lambda, s->lambda2, s->avctx->me_cmp);
-
-    for(i=0; i<9; i++){
-        int mb_x2= mb_x + (i%3) - 1;
-        int mb_y2= mb_y + (i/3) - 1;
-        int x= block_w*mb_x2 + block_w/2;
-        int y= block_w*mb_y2 + block_w/2;
-
-        add_yblock(s, 0, NULL, zero_dst, dst, obmc,
-                   x, y, block_w, block_w, w, h, /*dst_stride*/0, ref_stride, obmc_stride, mb_x2, mb_y2, 1, 1, plane_index);
-
-        //FIXME find a cleaner/simpler way to skip the outside stuff
-        for(y2= y; y2<0; y2++)
-            memcpy(dst + x + y2*ref_stride, src + x + y2*ref_stride, block_w);
-        for(y2= h; y2<y+block_w; y2++)
-            memcpy(dst + x + y2*ref_stride, src + x + y2*ref_stride, block_w);
-        if(x<0){
-            for(y2= y; y2<y+block_w; y2++)
-                memcpy(dst + x + y2*ref_stride, src + x + y2*ref_stride, -x);
-        }
-        if(x+block_w > w){
-            for(y2= y; y2<y+block_w; y2++)
-                memcpy(dst + w + y2*ref_stride, src + w + y2*ref_stride, x+block_w - w);
-        }
-
-        assert(block_w== 8 || block_w==16);
-        distortion += s->dsp.me_cmp[block_w==8](&s->m, src + x + y*ref_stride, dst + x + y*ref_stride, ref_stride, block_w);
-    }
-
-    if(plane_index==0){
-        BlockNode *b= &s->block[mb_x+mb_y*b_stride];
-        int merged= same_block(b,b+1) && same_block(b,b+b_stride) && same_block(b,b+b_stride+1);
-
-/* ..RRRr
- * .RXXx.
- * .RXXx.
- * rxxx.
- */
-        if(merged)
-            rate = get_block_bits(s, mb_x, mb_y, 2);
-        for(i=merged?4:0; i<9; i++){
-            static const int dxy[9][2] = {{0,0},{1,0},{0,1},{1,1},{2,0},{2,1},{-1,2},{0,2},{1,2}};
-            rate += get_block_bits(s, mb_x + dxy[i][0], mb_y + dxy[i][1], 1);
-        }
-    }
-    return distortion + rate*penalty_factor;
-}
-
-static int encode_subband_c0run(SnowContext *s, SubBand *b, IDWTELEM *src, IDWTELEM *parent, int stride, int orientation){
-    const int w= b->width;
-    const int h= b->height;
-    int x, y;
-
-    if(1){
-        int run=0;
-        int *runs = s->run_buffer;
-        int run_index=0;
-        int max_index;
-
-        for(y=0; y<h; y++){
-            for(x=0; x<w; x++){
-                int v, p=0;
-                int /*ll=0, */l=0, lt=0, t=0, rt=0;
-                v= src[x + y*stride];
-
-                if(y){
-                    t= src[x + (y-1)*stride];
-                    if(x){
-                        lt= src[x - 1 + (y-1)*stride];
-                    }
-                    if(x + 1 < w){
-                        rt= src[x + 1 + (y-1)*stride];
-                    }
-                }
-                if(x){
-                    l= src[x - 1 + y*stride];
-                    /*if(x > 1){
-                        if(orientation==1) ll= src[y + (x-2)*stride];
-                        else               ll= src[x - 2 + y*stride];
-                    }*/
-                }
-                if(parent){
-                    int px= x>>1;
-                    int py= y>>1;
-                    if(px<b->parent->width && py<b->parent->height)
-                        p= parent[px + py*2*stride];
-                }
-                if(!(/*ll|*/l|lt|t|rt|p)){
-                    if(v){
-                        runs[run_index++]= run;
-                        run=0;
-                    }else{
-                        run++;
-                    }
-                }
-            }
-        }
-        max_index= run_index;
-        runs[run_index++]= run;
-        run_index=0;
-        run= runs[run_index++];
-
-        put_symbol2(&s->c, b->state[30], max_index, 0);
-        if(run_index <= max_index)
-            put_symbol2(&s->c, b->state[1], run, 3);
-
-        for(y=0; y<h; y++){
-            if(s->c.bytestream_end - s->c.bytestream < w*40){
-                av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
-                return -1;
-            }
-            for(x=0; x<w; x++){
-                int v, p=0;
-                int /*ll=0, */l=0, lt=0, t=0, rt=0;
-                v= src[x + y*stride];
-
-                if(y){
-                    t= src[x + (y-1)*stride];
-                    if(x){
-                        lt= src[x - 1 + (y-1)*stride];
-                    }
-                    if(x + 1 < w){
-                        rt= src[x + 1 + (y-1)*stride];
-                    }
-                }
-                if(x){
-                    l= src[x - 1 + y*stride];
-                    /*if(x > 1){
-                        if(orientation==1) ll= src[y + (x-2)*stride];
-                        else               ll= src[x - 2 + y*stride];
-                    }*/
-                }
-                if(parent){
-                    int px= x>>1;
-                    int py= y>>1;
-                    if(px<b->parent->width && py<b->parent->height)
-                        p= parent[px + py*2*stride];
-                }
-                if(/*ll|*/l|lt|t|rt|p){
-                    int context= av_log2(/*FFABS(ll) + */3*FFABS(l) + FFABS(lt) + 2*FFABS(t) + FFABS(rt) + FFABS(p));
-
-                    put_rac(&s->c, &b->state[0][context], !!v);
-                }else{
-                    if(!run){
-                        run= runs[run_index++];
-
-                        if(run_index <= max_index)
-                            put_symbol2(&s->c, b->state[1], run, 3);
-                        assert(v);
-                    }else{
-                        run--;
-                        assert(!v);
-                    }
-                }
-                if(v){
-                    int context= av_log2(/*FFABS(ll) + */3*FFABS(l) + FFABS(lt) + 2*FFABS(t) + FFABS(rt) + FFABS(p));
-                    int l2= 2*FFABS(l) + (l<0);
-                    int t2= 2*FFABS(t) + (t<0);
-
-                    put_symbol2(&s->c, b->state[context + 2], FFABS(v)-1, context-4);
-                    put_rac(&s->c, &b->state[0][16 + 1 + 3 + ff_quant3bA[l2&0xFF] + 3*ff_quant3bA[t2&0xFF]], v<0);
-                }
-            }
-        }
-    }
-    return 0;
-}
-
-static int encode_subband(SnowContext *s, SubBand *b, IDWTELEM *src, IDWTELEM *parent, int stride, int orientation){
-//    encode_subband_qtree(s, b, src, parent, stride, orientation);
-//    encode_subband_z0run(s, b, src, parent, stride, orientation);
-    return encode_subband_c0run(s, b, src, parent, stride, orientation);
-//    encode_subband_dzr(s, b, src, parent, stride, orientation);
-}
-
-static av_always_inline int check_block(SnowContext *s, int mb_x, int mb_y, int p[3], int intra, uint8_t (*obmc_edged)[MB_SIZE * 2], int *best_rd){
-    const int b_stride= s->b_width << s->block_max_depth;
-    BlockNode *block= &s->block[mb_x + mb_y * b_stride];
-    BlockNode backup= *block;
-    unsigned value;
-    int rd, index;
-
-    assert(mb_x>=0 && mb_y>=0);
-    assert(mb_x<b_stride);
-
-    if(intra){
-        block->color[0] = p[0];
-        block->color[1] = p[1];
-        block->color[2] = p[2];
-        block->type |= BLOCK_INTRA;
-    }else{
-        index= (p[0] + 31*p[1]) & (ME_CACHE_SIZE-1);
-        value= s->me_cache_generation + (p[0]>>10) + (p[1]<<6) + (block->ref<<12);
-        if(s->me_cache[index] == value)
-            return 0;
-        s->me_cache[index]= value;
-
-        block->mx= p[0];
-        block->my= p[1];
-        block->type &= ~BLOCK_INTRA;
-    }
-
-    rd= get_block_rd(s, mb_x, mb_y, 0, obmc_edged);
-
-//FIXME chroma
-    if(rd < *best_rd){
-        *best_rd= rd;
-        return 1;
-    }else{
-        *block= backup;
-        return 0;
-    }
-}
-
-/* special case for int[2] args we discard afterwards,
- * fixes compilation problem with gcc 2.95 */
-static av_always_inline int check_block_inter(SnowContext *s, int mb_x, int mb_y, int p0, int p1, uint8_t (*obmc_edged)[MB_SIZE * 2], int *best_rd){
-    int p[2] = {p0, p1};
-    return check_block(s, mb_x, mb_y, p, 0, obmc_edged, best_rd);
-}
-
-static av_always_inline int check_4block_inter(SnowContext *s, int mb_x, int mb_y, int p0, int p1, int ref, int *best_rd){
-    const int b_stride= s->b_width << s->block_max_depth;
-    BlockNode *block= &s->block[mb_x + mb_y * b_stride];
-    BlockNode backup[4];
-    unsigned value;
-    int rd, index;
-
-    /* We don't initialize backup[] during variable declaration, because
-     * that fails to compile on MSVC: "cannot convert from 'BlockNode' to
-     * 'int16_t'". */
-    backup[0] = block[0];
-    backup[1] = block[1];
-    backup[2] = block[b_stride];
-    backup[3] = block[b_stride + 1];
-
-    assert(mb_x>=0 && mb_y>=0);
-    assert(mb_x<b_stride);
-    assert(((mb_x|mb_y)&1) == 0);
-
-    index= (p0 + 31*p1) & (ME_CACHE_SIZE-1);
-    value= s->me_cache_generation + (p0>>10) + (p1<<6) + (block->ref<<12);
-    if(s->me_cache[index] == value)
-        return 0;
-    s->me_cache[index]= value;
-
-    block->mx= p0;
-    block->my= p1;
-    block->ref= ref;
-    block->type &= ~BLOCK_INTRA;
-    block[1]= block[b_stride]= block[b_stride+1]= *block;
-
-    rd= get_4block_rd(s, mb_x, mb_y, 0);
-
-//FIXME chroma
-    if(rd < *best_rd){
-        *best_rd= rd;
-        return 1;
-    }else{
-        block[0]= backup[0];
-        block[1]= backup[1];
-        block[b_stride]= backup[2];
-        block[b_stride+1]= backup[3];
-        return 0;
-    }
-}
-
-static void iterative_me(SnowContext *s){
-    int pass, mb_x, mb_y;
-    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;
-    int color[3];
-
-    {
-        RangeCoder r = s->c;
-        uint8_t state[sizeof(s->block_state)];
-        memcpy(state, s->block_state, sizeof(s->block_state));
-        for(mb_y= 0; mb_y<s->b_height; mb_y++)
-            for(mb_x= 0; mb_x<s->b_width; mb_x++)
-                encode_q_branch(s, 0, mb_x, mb_y);
-        s->c = r;
-        memcpy(s->block_state, state, sizeof(s->block_state));
-    }
-
-    for(pass=0; pass<25; pass++){
-        int change= 0;
-
-        for(mb_y= 0; mb_y<b_height; mb_y++){
-            for(mb_x= 0; mb_x<b_width; mb_x++){
-                int dia_change, i, j, ref;
-                int best_rd= INT_MAX, ref_rd;
-                BlockNode backup, ref_b;
-                const int index= mb_x + mb_y * b_stride;
-                BlockNode *block= &s->block[index];
-                BlockNode *tb =                   mb_y            ? &s->block[index-b_stride  ] : NULL;
-                BlockNode *lb = mb_x                              ? &s->block[index         -1] : NULL;
-                BlockNode *rb = mb_x+1<b_width                    ? &s->block[index         +1] : NULL;
-                BlockNode *bb =                   mb_y+1<b_height ? &s->block[index+b_stride  ] : NULL;
-                BlockNode *tlb= mb_x           && mb_y            ? &s->block[index-b_stride-1] : NULL;
-                BlockNode *trb= mb_x+1<b_width && mb_y            ? &s->block[index-b_stride+1] : NULL;
-                BlockNode *blb= mb_x           && mb_y+1<b_height ? &s->block[index+b_stride-1] : NULL;
-                BlockNode *brb= mb_x+1<b_width && mb_y+1<b_height ? &s->block[index+b_stride+1] : NULL;
-                const int b_w= (MB_SIZE >> s->block_max_depth);
-                uint8_t obmc_edged[MB_SIZE * 2][MB_SIZE * 2];
-
-                if(pass && (block->type & BLOCK_OPT))
-                    continue;
-                block->type |= BLOCK_OPT;
-
-                backup= *block;
-
-                if(!s->me_cache_generation)
-                    memset(s->me_cache, 0, sizeof(s->me_cache));
-                s->me_cache_generation += 1<<22;
-
-                //FIXME precalculate
-                {
-                    int x, y;
-                    for (y = 0; y < b_w * 2; y++)
-                        memcpy(obmc_edged[y], ff_obmc_tab[s->block_max_depth] + y * b_w * 2, b_w * 2);
-                    if(mb_x==0)
-                        for(y=0; y<b_w*2; y++)
-                            memset(obmc_edged[y], obmc_edged[y][0] + obmc_edged[y][b_w-1], b_w);
-                    if(mb_x==b_stride-1)
-                        for(y=0; y<b_w*2; y++)
-                            memset(obmc_edged[y]+b_w, obmc_edged[y][b_w] + obmc_edged[y][b_w*2-1], b_w);
-                    if(mb_y==0){
-                        for(x=0; x<b_w*2; x++)
-                            obmc_edged[0][x] += obmc_edged[b_w-1][x];
-                        for(y=1; y<b_w; y++)
-                            memcpy(obmc_edged[y], obmc_edged[0], b_w*2);
-                    }
-                    if(mb_y==b_height-1){
-                        for(x=0; x<b_w*2; x++)
-                            obmc_edged[b_w*2-1][x] += obmc_edged[b_w][x];
-                        for(y=b_w; y<b_w*2-1; y++)
-                            memcpy(obmc_edged[y], obmc_edged[b_w*2-1], b_w*2);
-                    }
-                }
-
-                //skip stuff outside the picture
-                if(mb_x==0 || mb_y==0 || mb_x==b_width-1 || mb_y==b_height-1){
-                    uint8_t *src= s->  input_picture.data[0];
-                    uint8_t *dst= s->current_picture.data[0];
-                    const int stride= s->current_picture.linesize[0];
-                    const int block_w= MB_SIZE >> s->block_max_depth;
-                    const int sx= block_w*mb_x - block_w/2;
-                    const int sy= block_w*mb_y - block_w/2;
-                    const int w= s->plane[0].width;
-                    const int h= s->plane[0].height;
-                    int y;
-
-                    for(y=sy; y<0; y++)
-                        memcpy(dst + sx + y*stride, src + sx + y*stride, block_w*2);
-                    for(y=h; y<sy+block_w*2; y++)
-                        memcpy(dst + sx + y*stride, src + sx + y*stride, block_w*2);
-                    if(sx<0){
-                        for(y=sy; y<sy+block_w*2; y++)
-                            memcpy(dst + sx + y*stride, src + sx + y*stride, -sx);
-                    }
-                    if(sx+block_w*2 > w){
-                        for(y=sy; y<sy+block_w*2; y++)
-                            memcpy(dst + w + y*stride, src + w + y*stride, sx+block_w*2 - w);
-                    }
-                }
-
-                // intra(black) = neighbors' contribution to the current block
-                for(i=0; i<3; i++)
-                    color[i]= get_dc(s, mb_x, mb_y, i);
-
-                // get previous score (cannot be cached due to OBMC)
-                if(pass > 0 && (block->type&BLOCK_INTRA)){
-                    int color0[3]= {block->color[0], block->color[1], block->color[2]};
-                    check_block(s, mb_x, mb_y, color0, 1, obmc_edged, &best_rd);
-                }else
-                    check_block_inter(s, mb_x, mb_y, block->mx, block->my, obmc_edged, &best_rd);
-
-                ref_b= *block;
-                ref_rd= best_rd;
-                for(ref=0; ref < s->ref_frames; ref++){
-                    int16_t (*mvr)[2]= &s->ref_mvs[ref][index];
-                    if(s->ref_scores[ref][index] > s->ref_scores[ref_b.ref][index]*3/2) //FIXME tune threshold
-                        continue;
-                    block->ref= ref;
-                    best_rd= INT_MAX;
-
-                    check_block_inter(s, mb_x, mb_y, mvr[0][0], mvr[0][1], obmc_edged, &best_rd);
-                    check_block_inter(s, mb_x, mb_y, 0, 0, obmc_edged, &best_rd);
-                    if(tb)
-                        check_block_inter(s, mb_x, mb_y, mvr[-b_stride][0], mvr[-b_stride][1], obmc_edged, &best_rd);
-                    if(lb)
-                        check_block_inter(s, mb_x, mb_y, mvr[-1][0], mvr[-1][1], obmc_edged, &best_rd);
-                    if(rb)
-                        check_block_inter(s, mb_x, mb_y, mvr[1][0], mvr[1][1], obmc_edged, &best_rd);
-                    if(bb)
-                        check_block_inter(s, mb_x, mb_y, mvr[b_stride][0], mvr[b_stride][1], obmc_edged, &best_rd);
-
-                    /* fullpel ME */
-                    //FIXME avoid subpel interpolation / round to nearest integer
-                    do{
-                        dia_change=0;
-                        for(i=0; i<FFMAX(s->avctx->dia_size, 1); i++){
-                            for(j=0; j<i; j++){
-                                dia_change |= check_block_inter(s, mb_x, mb_y, block->mx+4*(i-j), block->my+(4*j), obmc_edged, &best_rd);
-                                dia_change |= check_block_inter(s, mb_x, mb_y, block->mx-4*(i-j), block->my-(4*j), obmc_edged, &best_rd);
-                                dia_change |= check_block_inter(s, mb_x, mb_y, block->mx+4*(i-j), block->my-(4*j), obmc_edged, &best_rd);
-                                dia_change |= check_block_inter(s, mb_x, mb_y, block->mx-4*(i-j), block->my+(4*j), obmc_edged, &best_rd);
-                            }
-                        }
-                    }while(dia_change);
-                    /* subpel ME */
-                    do{
-                        static const int square[8][2]= {{+1, 0},{-1, 0},{ 0,+1},{ 0,-1},{+1,+1},{-1,-1},{+1,-1},{-1,+1},};
-                        dia_change=0;
-                        for(i=0; i<8; i++)
-                            dia_change |= check_block_inter(s, mb_x, mb_y, block->mx+square[i][0], block->my+square[i][1], obmc_edged, &best_rd);
-                    }while(dia_change);
-                    //FIXME or try the standard 2 pass qpel or similar
-
-                    mvr[0][0]= block->mx;
-                    mvr[0][1]= block->my;
-                    if(ref_rd > best_rd){
-                        ref_rd= best_rd;
-                        ref_b= *block;
-                    }
-                }
-                best_rd= ref_rd;
-                *block= ref_b;
-                check_block(s, mb_x, mb_y, color, 1, obmc_edged, &best_rd);
-                //FIXME RD style color selection
-                if(!same_block(block, &backup)){
-                    if(tb ) tb ->type &= ~BLOCK_OPT;
-                    if(lb ) lb ->type &= ~BLOCK_OPT;
-                    if(rb ) rb ->type &= ~BLOCK_OPT;
-                    if(bb ) bb ->type &= ~BLOCK_OPT;
-                    if(tlb) tlb->type &= ~BLOCK_OPT;
-                    if(trb) trb->type &= ~BLOCK_OPT;
-                    if(blb) blb->type &= ~BLOCK_OPT;
-                    if(brb) brb->type &= ~BLOCK_OPT;
-                    change ++;
-                }
-            }
-        }
-        av_log(s->avctx, AV_LOG_ERROR, "pass:%d changed:%d\n", pass, change);
-        if(!change)
-            break;
-    }
-
-    if(s->block_max_depth == 1){
-        int change= 0;
-        for(mb_y= 0; mb_y<b_height; mb_y+=2){
-            for(mb_x= 0; mb_x<b_width; mb_x+=2){
-                int i;
-                int best_rd, init_rd;
-                const int index= mb_x + mb_y * b_stride;
-                BlockNode *b[4];
-
-                b[0]= &s->block[index];
-                b[1]= b[0]+1;
-                b[2]= b[0]+b_stride;
-                b[3]= b[2]+1;
-                if(same_block(b[0], b[1]) &&
-                   same_block(b[0], b[2]) &&
-                   same_block(b[0], b[3]))
-                    continue;
-
-                if(!s->me_cache_generation)
-                    memset(s->me_cache, 0, sizeof(s->me_cache));
-                s->me_cache_generation += 1<<22;
-
-                init_rd= best_rd= get_4block_rd(s, mb_x, mb_y, 0);
-
-                //FIXME more multiref search?
-                check_4block_inter(s, mb_x, mb_y,
-                                   (b[0]->mx + b[1]->mx + b[2]->mx + b[3]->mx + 2) >> 2,
-                                   (b[0]->my + b[1]->my + b[2]->my + b[3]->my + 2) >> 2, 0, &best_rd);
-
-                for(i=0; i<4; i++)
-                    if(!(b[i]->type&BLOCK_INTRA))
-                        check_4block_inter(s, mb_x, mb_y, b[i]->mx, b[i]->my, b[i]->ref, &best_rd);
-
-                if(init_rd != best_rd)
-                    change++;
-            }
-        }
-        av_log(s->avctx, AV_LOG_ERROR, "pass:4mv changed:%d\n", change*4);
-    }
-}
-
-static void encode_blocks(SnowContext *s, int search){
-    int x, y;
-    int w= s->b_width;
-    int h= s->b_height;
-
-    if(s->avctx->me_method == ME_ITER && !s->keyframe && search)
-        iterative_me(s);
-
-    for(y=0; y<h; y++){
-        if(s->c.bytestream_end - s->c.bytestream < w*MB_SIZE*MB_SIZE*3){ //FIXME nicer limit
-            av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
-            return;
-        }
-        for(x=0; x<w; x++){
-            if(s->avctx->me_method == ME_ITER || !search)
-                encode_q_branch2(s, 0, x, y);
-            else
-                encode_q_branch (s, 0, x, y);
-        }
-    }
-}
-
-static void quantize(SnowContext *s, SubBand *b, IDWTELEM *dst, DWTELEM *src, int stride, int bias){
-    const int w= b->width;
-    const int h= b->height;
-    const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
-    const int qmul= ff_qexp[qlog&(QROOT-1)]<<((qlog>>QSHIFT) + ENCODER_EXTRA_BITS);
-    int x,y, thres1, thres2;
-
-    if(s->qlog == LOSSLESS_QLOG){
-        for(y=0; y<h; y++)
-            for(x=0; x<w; x++)
-                dst[x + y*stride]= src[x + y*stride];
-        return;
-    }
-
-    bias= bias ? 0 : (3*qmul)>>3;
-    thres1= ((qmul - bias)>>QEXPSHIFT) - 1;
-    thres2= 2*thres1;
-
-    if(!bias){
-        for(y=0; y<h; y++){
-            for(x=0; x<w; x++){
-                int i= src[x + y*stride];
-
-                if((unsigned)(i+thres1) > thres2){
-                    if(i>=0){
-                        i<<= QEXPSHIFT;
-                        i/= qmul; //FIXME optimize
-                        dst[x + y*stride]=  i;
-                    }else{
-                        i= -i;
-                        i<<= QEXPSHIFT;
-                        i/= qmul; //FIXME optimize
-                        dst[x + y*stride]= -i;
-                    }
-                }else
-                    dst[x + y*stride]= 0;
-            }
-        }
-    }else{
-        for(y=0; y<h; y++){
-            for(x=0; x<w; x++){
-                int i= src[x + y*stride];
-
-                if((unsigned)(i+thres1) > thres2){
-                    if(i>=0){
-                        i<<= QEXPSHIFT;
-                        i= (i + bias) / qmul; //FIXME optimize
-                        dst[x + y*stride]=  i;
-                    }else{
-                        i= -i;
-                        i<<= QEXPSHIFT;
-                        i= (i + bias) / qmul; //FIXME optimize
-                        dst[x + y*stride]= -i;
-                    }
-                }else
-                    dst[x + y*stride]= 0;
-            }
-        }
-    }
-}
-
-static void dequantize(SnowContext *s, SubBand *b, IDWTELEM *src, int stride){
-    const int w= b->width;
-    const int h= b->height;
-    const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
-    const int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
-    const int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
-    int x,y;
-
-    if(s->qlog == LOSSLESS_QLOG) return;
-
-    for(y=0; y<h; y++){
-        for(x=0; x<w; x++){
-            int i= src[x + y*stride];
-            if(i<0){
-                src[x + y*stride]= -((-i*qmul + qadd)>>(QEXPSHIFT)); //FIXME try different bias
-            }else if(i>0){
-                src[x + y*stride]=  (( i*qmul + qadd)>>(QEXPSHIFT));
-            }
-        }
-    }
-}
-
-static void decorrelate(SnowContext *s, SubBand *b, IDWTELEM *src, int stride, int inverse, int use_median){
-    const int w= b->width;
-    const int h= b->height;
-    int x,y;
-
-    for(y=h-1; y>=0; y--){
-        for(x=w-1; x>=0; x--){
-            int i= x + y*stride;
-
-            if(x){
-                if(use_median){
-                    if(y && x+1<w) src[i] -= mid_pred(src[i - 1], src[i - stride], src[i - stride + 1]);
-                    else  src[i] -= src[i - 1];
-                }else{
-                    if(y) src[i] -= mid_pred(src[i - 1], src[i - stride], src[i - 1] + src[i - stride] - src[i - 1 - stride]);
-                    else  src[i] -= src[i - 1];
-                }
-            }else{
-                if(y) src[i] -= src[i - stride];
-            }
-        }
-    }
-}
-
-static void correlate(SnowContext *s, SubBand *b, IDWTELEM *src, int stride, int inverse, int use_median){
-    const int w= b->width;
-    const int h= b->height;
-    int x,y;
-
-    for(y=0; y<h; y++){
-        for(x=0; x<w; x++){
-            int i= x + y*stride;
-
-            if(x){
-                if(use_median){
-                    if(y && x+1<w) src[i] += mid_pred(src[i - 1], src[i - stride], src[i - stride + 1]);
-                    else  src[i] += src[i - 1];
-                }else{
-                    if(y) src[i] += mid_pred(src[i - 1], src[i - stride], src[i - 1] + src[i - stride] - src[i - 1 - stride]);
-                    else  src[i] += src[i - 1];
-                }
-            }else{
-                if(y) src[i] += src[i - stride];
-            }
-        }
-    }
-}
-
-static void encode_qlogs(SnowContext *s){
-    int plane_index, level, orientation;
-
-    for(plane_index=0; plane_index<2; plane_index++){
-        for(level=0; level<s->spatial_decomposition_count; level++){
-            for(orientation=level ? 1:0; orientation<4; orientation++){
-                if(orientation==2) continue;
-                put_symbol(&s->c, s->header_state, s->plane[plane_index].band[level][orientation].qlog, 1);
-            }
-        }
-    }
-}
-
-static void encode_header(SnowContext *s){
-    int plane_index, i;
-    uint8_t kstate[32];
-
-    memset(kstate, MID_STATE, sizeof(kstate));
-
-    put_rac(&s->c, kstate, s->keyframe);
-    if(s->keyframe || s->always_reset){
-        ff_snow_reset_contexts(s);
-        s->last_spatial_decomposition_type=
-        s->last_qlog=
-        s->last_qbias=
-        s->last_mv_scale=
-        s->last_block_max_depth= 0;
-        for(plane_index=0; plane_index<2; plane_index++){
-            Plane *p= &s->plane[plane_index];
-            p->last_htaps=0;
-            p->last_diag_mc=0;
-            memset(p->last_hcoeff, 0, sizeof(p->last_hcoeff));
-        }
-    }
-    if(s->keyframe){
-        put_symbol(&s->c, s->header_state, s->version, 0);
-        put_rac(&s->c, s->header_state, s->always_reset);
-        put_symbol(&s->c, s->header_state, s->temporal_decomposition_type, 0);
-        put_symbol(&s->c, s->header_state, s->temporal_decomposition_count, 0);
-        put_symbol(&s->c, s->header_state, s->spatial_decomposition_count, 0);
-        put_symbol(&s->c, s->header_state, s->colorspace_type, 0);
-        put_symbol(&s->c, s->header_state, s->chroma_h_shift, 0);
-        put_symbol(&s->c, s->header_state, s->chroma_v_shift, 0);
-        put_rac(&s->c, s->header_state, s->spatial_scalability);
-//        put_rac(&s->c, s->header_state, s->rate_scalability);
-        put_symbol(&s->c, s->header_state, s->max_ref_frames-1, 0);
-
-        encode_qlogs(s);
-    }
-
-    if(!s->keyframe){
-        int update_mc=0;
-        for(plane_index=0; plane_index<2; plane_index++){
-            Plane *p= &s->plane[plane_index];
-            update_mc |= p->last_htaps   != p->htaps;
-            update_mc |= p->last_diag_mc != p->diag_mc;
-            update_mc |= !!memcmp(p->last_hcoeff, p->hcoeff, sizeof(p->hcoeff));
-        }
-        put_rac(&s->c, s->header_state, update_mc);
-        if(update_mc){
-            for(plane_index=0; plane_index<2; plane_index++){
-                Plane *p= &s->plane[plane_index];
-                put_rac(&s->c, s->header_state, p->diag_mc);
-                put_symbol(&s->c, s->header_state, p->htaps/2-1, 0);
-                for(i= p->htaps/2; i; i--)
-                    put_symbol(&s->c, s->header_state, FFABS(p->hcoeff[i]), 0);
-            }
-        }
-        if(s->last_spatial_decomposition_count != s->spatial_decomposition_count){
-            put_rac(&s->c, s->header_state, 1);
-            put_symbol(&s->c, s->header_state, s->spatial_decomposition_count, 0);
-            encode_qlogs(s);
-        }else
-            put_rac(&s->c, s->header_state, 0);
-    }
-
-    put_symbol(&s->c, s->header_state, s->spatial_decomposition_type - s->last_spatial_decomposition_type, 1);
-    put_symbol(&s->c, s->header_state, s->qlog            - s->last_qlog    , 1);
-    put_symbol(&s->c, s->header_state, s->mv_scale        - s->last_mv_scale, 1);
-    put_symbol(&s->c, s->header_state, s->qbias           - s->last_qbias   , 1);
-    put_symbol(&s->c, s->header_state, s->block_max_depth - s->last_block_max_depth, 1);
-
-}
-
-static void update_last_header_values(SnowContext *s){
-    int plane_index;
-
-    if(!s->keyframe){
-        for(plane_index=0; plane_index<2; plane_index++){
-            Plane *p= &s->plane[plane_index];
-            p->last_diag_mc= p->diag_mc;
-            p->last_htaps  = p->htaps;
-            memcpy(p->last_hcoeff, p->hcoeff, sizeof(p->hcoeff));
-        }
-    }
-
-    s->last_spatial_decomposition_type  = s->spatial_decomposition_type;
-    s->last_qlog                        = s->qlog;
-    s->last_qbias                       = s->qbias;
-    s->last_mv_scale                    = s->mv_scale;
-    s->last_block_max_depth             = s->block_max_depth;
-    s->last_spatial_decomposition_count = s->spatial_decomposition_count;
-}
-
-static int qscale2qlog(int qscale){
-    return rint(QROOT*log2(qscale / (float)FF_QP2LAMBDA))
-           + 61*QROOT/8; ///< 64 > 60
-}
-
-static int ratecontrol_1pass(SnowContext *s, AVFrame *pict)
-{
-    /* Estimate the frame's complexity as a sum of weighted dwt coefficients.
-     * FIXME we know exact mv bits at this point,
-     * but ratecontrol isn't set up to include them. */
-    uint32_t coef_sum= 0;
-    int level, orientation, delta_qlog;
-
-    for(level=0; level<s->spatial_decomposition_count; level++){
-        for(orientation=level ? 1 : 0; orientation<4; orientation++){
-            SubBand *b= &s->plane[0].band[level][orientation];
-            IDWTELEM *buf= b->ibuf;
-            const int w= b->width;
-            const int h= b->height;
-            const int stride= b->stride;
-            const int qlog= av_clip(2*QROOT + b->qlog, 0, QROOT*16);
-            const int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
-            const int qdiv= (1<<16)/qmul;
-            int x, y;
-            //FIXME this is ugly
-            for(y=0; y<h; y++)
-                for(x=0; x<w; x++)
-                    buf[x+y*stride]= b->buf[x+y*stride];
-            if(orientation==0)
-                decorrelate(s, b, buf, stride, 1, 0);
-            for(y=0; y<h; y++)
-                for(x=0; x<w; x++)
-                    coef_sum+= abs(buf[x+y*stride]) * qdiv >> 16;
-        }
-    }
-
-    /* ugly, ratecontrol just takes a sqrt again */
-    coef_sum = (uint64_t)coef_sum * coef_sum >> 16;
-    assert(coef_sum < INT_MAX);
-
-    if(pict->pict_type == AV_PICTURE_TYPE_I){
-        s->m.current_picture.mb_var_sum= coef_sum;
-        s->m.current_picture.mc_mb_var_sum= 0;
-    }else{
-        s->m.current_picture.mc_mb_var_sum= coef_sum;
-        s->m.current_picture.mb_var_sum= 0;
-    }
-
-    pict->quality= ff_rate_estimate_qscale(&s->m, 1);
-    if (pict->quality < 0)
-        return INT_MIN;
-    s->lambda= pict->quality * 3/2;
-    delta_qlog= qscale2qlog(pict->quality) - s->qlog;
-    s->qlog+= delta_qlog;
-    return delta_qlog;
-}
-
-static void calculate_visual_weight(SnowContext *s, Plane *p){
-    int width = p->width;
-    int height= p->height;
-    int level, orientation, x, y;
-
-    for(level=0; level<s->spatial_decomposition_count; level++){
-        for(orientation=level ? 1 : 0; orientation<4; orientation++){
-            SubBand *b= &p->band[level][orientation];
-            IDWTELEM *ibuf= b->ibuf;
-            int64_t error=0;
-
-            memset(s->spatial_idwt_buffer, 0, sizeof(*s->spatial_idwt_buffer)*width*height);
-            ibuf[b->width/2 + b->height/2*b->stride]= 256*16;
-            ff_spatial_idwt(s->spatial_idwt_buffer, s->temp_idwt_buffer, width, height, width, s->spatial_decomposition_type, s->spatial_decomposition_count);
-            for(y=0; y<height; y++){
-                for(x=0; x<width; x++){
-                    int64_t d= s->spatial_idwt_buffer[x + y*width]*16;
-                    error += d*d;
-                }
-            }
-
-            b->qlog= (int)(log(352256.0/sqrt(error)) / log(pow(2.0, 1.0/QROOT))+0.5);
-        }
-    }
-}
-
-static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
-                        const AVFrame *pict, int *got_packet)
-{
-    SnowContext *s = avctx->priv_data;
-    RangeCoder * const c= &s->c;
-    AVFrame *pic = &s->new_picture;
-    const int width= s->avctx->width;
-    const int height= s->avctx->height;
-    int level, orientation, plane_index, i, y, ret;
-    uint8_t rc_header_bak[sizeof(s->header_state)];
-    uint8_t rc_block_bak[sizeof(s->block_state)];
-
-    if (!pkt->data &&
-        (ret = av_new_packet(pkt, s->b_width*s->b_height*MB_SIZE*MB_SIZE*3 + FF_MIN_BUFFER_SIZE)) < 0) {
-        av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
-        return ret;
-    }
-
-    ff_init_range_encoder(c, pkt->data, pkt->size);
-    ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);
-
-    for(i=0; i<3; i++){
-        int shift= !!i;
-        for(y=0; y<(height>>shift); y++)
-            memcpy(&s->input_picture.data[i][y * s->input_picture.linesize[i]],
-                   &pict->data[i][y * pict->linesize[i]],
-                   width>>shift);
-    }
-    s->new_picture = *pict;
-
-    s->m.picture_number= avctx->frame_number;
-    if(avctx->flags&CODEC_FLAG_PASS2){
-        s->m.pict_type = pic->pict_type = s->m.rc_context.entry[avctx->frame_number].new_pict_type;
-        s->keyframe = pic->pict_type == AV_PICTURE_TYPE_I;
-        if(!(avctx->flags&CODEC_FLAG_QSCALE)) {
-            pic->quality = ff_rate_estimate_qscale(&s->m, 0);
-            if (pic->quality < 0)
-                return -1;
-        }
-    }else{
-        s->keyframe= avctx->gop_size==0 || avctx->frame_number % avctx->gop_size == 0;
-        s->m.pict_type = pic->pict_type = s->keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
-    }
-
-    if(s->pass1_rc && avctx->frame_number == 0)
-        pic->quality = 2*FF_QP2LAMBDA;
-    if (pic->quality) {
-        s->qlog   = qscale2qlog(pic->quality);
-        s->lambda = pic->quality * 3/2;
-    }
-    if (s->qlog < 0 || (!pic->quality && (avctx->flags & CODEC_FLAG_QSCALE))) {
-        s->qlog= LOSSLESS_QLOG;
-        s->lambda = 0;
-    }//else keep previous frame's qlog until after motion estimation
-
-    ff_snow_frame_start(s);
-
-    s->m.current_picture_ptr= &s->m.current_picture;
-    s->m.last_picture.f.pts = s->m.current_picture.f.pts;
-    s->m.current_picture.f.pts = pict->pts;
-    if(pic->pict_type == AV_PICTURE_TYPE_P){
-        int block_width = (width +15)>>4;
-        int block_height= (height+15)>>4;
-        int stride= s->current_picture.linesize[0];
-
-        assert(s->current_picture.data[0]);
-        assert(s->last_picture[0].data[0]);
-
-        s->m.avctx= s->avctx;
-        s->m.current_picture.f.data[0] = s->current_picture.data[0];
-        s->m.   last_picture.f.data[0] = s->last_picture[0].data[0];
-        s->m.    new_picture.f.data[0] = s->  input_picture.data[0];
-        s->m.   last_picture_ptr= &s->m.   last_picture;
-        s->m.linesize=
-        s->m.   last_picture.f.linesize[0] =
-        s->m.    new_picture.f.linesize[0] =
-        s->m.current_picture.f.linesize[0] = stride;
-        s->m.uvlinesize= s->current_picture.linesize[1];
-        s->m.width = width;
-        s->m.height= height;
-        s->m.mb_width = block_width;
-        s->m.mb_height= block_height;
-        s->m.mb_stride=   s->m.mb_width+1;
-        s->m.b8_stride= 2*s->m.mb_width+1;
-        s->m.f_code=1;
-        s->m.pict_type = pic->pict_type;
-        s->m.me_method= s->avctx->me_method;
-        s->m.me.scene_change_score=0;
-        s->m.flags= s->avctx->flags;
-        s->m.quarter_sample= (s->avctx->flags & CODEC_FLAG_QPEL)!=0;
-        s->m.out_format= FMT_H263;
-        s->m.unrestricted_mv= 1;
-
-        s->m.lambda = s->lambda;
-        s->m.qscale= (s->m.lambda*139 + FF_LAMBDA_SCALE*64) >> (FF_LAMBDA_SHIFT + 7);
-        s->lambda2= s->m.lambda2= (s->m.lambda*s->m.lambda + FF_LAMBDA_SCALE/2) >> FF_LAMBDA_SHIFT;
-
-        s->m.dsp= s->dsp; //move
-        ff_init_me(&s->m);
-        s->dsp= s->m.dsp;
-    }
-
-    if(s->pass1_rc){
-        memcpy(rc_header_bak, s->header_state, sizeof(s->header_state));
-        memcpy(rc_block_bak, s->block_state, sizeof(s->block_state));
-    }
-
-redo_frame:
-
-    if (pic->pict_type == AV_PICTURE_TYPE_I)
-        s->spatial_decomposition_count= 5;
-    else
-        s->spatial_decomposition_count= 5;
-
-    s->m.pict_type = pic->pict_type;
-    s->qbias = pic->pict_type == AV_PICTURE_TYPE_P ? 2 : 0;
-
-    ff_snow_common_init_after_header(avctx);
-
-    if(s->last_spatial_decomposition_count != s->spatial_decomposition_count){
-        for(plane_index=0; plane_index<3; plane_index++){
-            calculate_visual_weight(s, &s->plane[plane_index]);
-        }
-    }
-
-    encode_header(s);
-    s->m.misc_bits = 8*(s->c.bytestream - s->c.bytestream_start);
-    encode_blocks(s, 1);
-    s->m.mv_bits = 8*(s->c.bytestream - s->c.bytestream_start) - s->m.misc_bits;
-
-    for(plane_index=0; plane_index<3; plane_index++){
-        Plane *p= &s->plane[plane_index];
-        int w= p->width;
-        int h= p->height;
-        int x, y;
-//        int bits= put_bits_count(&s->c.pb);
-
-        if (!s->memc_only) {
-            //FIXME optimize
-            if(pict->data[plane_index]) //FIXME gray hack
-                for(y=0; y<h; y++){
-                    for(x=0; x<w; x++){
-                        s->spatial_idwt_buffer[y*w + x]= pict->data[plane_index][y*pict->linesize[plane_index] + x]<<FRAC_BITS;
-                    }
-                }
-            predict_plane(s, s->spatial_idwt_buffer, plane_index, 0);
-
-            if(   plane_index==0
-               && pic->pict_type == AV_PICTURE_TYPE_P
-               && !(avctx->flags&CODEC_FLAG_PASS2)
-               && s->m.me.scene_change_score > s->avctx->scenechange_threshold){
-                ff_init_range_encoder(c, pkt->data, pkt->size);
-                ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);
-                pic->pict_type= AV_PICTURE_TYPE_I;
-                s->keyframe=1;
-                s->current_picture.key_frame=1;
-                goto redo_frame;
-            }
-
-            if(s->qlog == LOSSLESS_QLOG){
-                for(y=0; y<h; y++){
-                    for(x=0; x<w; x++){
-                        s->spatial_dwt_buffer[y*w + x]= (s->spatial_idwt_buffer[y*w + x] + (1<<(FRAC_BITS-1))-1)>>FRAC_BITS;
-                    }
-                }
-            }else{
-                for(y=0; y<h; y++){
-                    for(x=0; x<w; x++){
-                        s->spatial_dwt_buffer[y*w + x]=s->spatial_idwt_buffer[y*w + x]<<ENCODER_EXTRA_BITS;
-                    }
-                }
-            }
-
-            /*  if(QUANTIZE2)
-                dwt_quantize(s, p, s->spatial_dwt_buffer, w, h, w, s->spatial_decomposition_type);
-            else*/
-                ff_spatial_dwt(s->spatial_dwt_buffer, s->temp_dwt_buffer, w, h, w, s->spatial_decomposition_type, s->spatial_decomposition_count);
-
-            if(s->pass1_rc && plane_index==0){
-                int delta_qlog = ratecontrol_1pass(s, pic);
-                if (delta_qlog <= INT_MIN)
-                    return -1;
-                if(delta_qlog){
-                    //reordering qlog in the bitstream would eliminate this reset
-                    ff_init_range_encoder(c, pkt->data, pkt->size);
-                    memcpy(s->header_state, rc_header_bak, sizeof(s->header_state));
-                    memcpy(s->block_state, rc_block_bak, sizeof(s->block_state));
-                    encode_header(s);
-                    encode_blocks(s, 0);
-                }
-            }
-
-            for(level=0; level<s->spatial_decomposition_count; level++){
-                for(orientation=level ? 1 : 0; orientation<4; orientation++){
-                    SubBand *b= &p->band[level][orientation];
-
-                    if(!QUANTIZE2)
-                        quantize(s, b, b->ibuf, b->buf, b->stride, s->qbias);
-                    if(orientation==0)
-                        decorrelate(s, b, b->ibuf, b->stride, pic->pict_type == AV_PICTURE_TYPE_P, 0);
-                    encode_subband(s, b, b->ibuf, b->parent ? b->parent->ibuf : NULL, b->stride, orientation);
-                    assert(b->parent==NULL || b->parent->stride == b->stride*2);
-                    if(orientation==0)
-                        correlate(s, b, b->ibuf, b->stride, 1, 0);
-                }
-            }
-
-            for(level=0; level<s->spatial_decomposition_count; level++){
-                for(orientation=level ? 1 : 0; orientation<4; orientation++){
-                    SubBand *b= &p->band[level][orientation];
-
-                    dequantize(s, b, b->ibuf, b->stride);
-                }
-            }
-
-            ff_spatial_idwt(s->spatial_idwt_buffer, s->temp_idwt_buffer, w, h, w, s->spatial_decomposition_type, s->spatial_decomposition_count);
-            if(s->qlog == LOSSLESS_QLOG){
-                for(y=0; y<h; y++){
-                    for(x=0; x<w; x++){
-                        s->spatial_idwt_buffer[y*w + x]<<=FRAC_BITS;
-                    }
-                }
-            }
-            predict_plane(s, s->spatial_idwt_buffer, plane_index, 1);
-        }else{
-            //ME/MC only
-            if(pic->pict_type == AV_PICTURE_TYPE_I){
-                for(y=0; y<h; y++){
-                    for(x=0; x<w; x++){
-                        s->current_picture.data[plane_index][y*s->current_picture.linesize[plane_index] + x]=
-                            pict->data[plane_index][y*pict->linesize[plane_index] + x];
-                    }
-                }
-            }else{
-                memset(s->spatial_idwt_buffer, 0, sizeof(IDWTELEM)*w*h);
-                predict_plane(s, s->spatial_idwt_buffer, plane_index, 1);
-            }
-        }
-        if(s->avctx->flags&CODEC_FLAG_PSNR){
-            int64_t error= 0;
-
-            if(pict->data[plane_index]) //FIXME gray hack
-                for(y=0; y<h; y++){
-                    for(x=0; x<w; x++){
-                        int d= s->current_picture.data[plane_index][y*s->current_picture.linesize[plane_index] + x] - pict->data[plane_index][y*pict->linesize[plane_index] + x];
-                        error += d*d;
-                    }
-                }
-            s->avctx->error[plane_index] += error;
-            s->current_picture.error[plane_index] = error;
-        }
-
-    }
-
-    update_last_header_values(s);
-
-    ff_snow_release_buffer(avctx);
-
-    s->current_picture.coded_picture_number = avctx->frame_number;
-    s->current_picture.pict_type = pict->pict_type;
-    s->current_picture.quality = pict->quality;
-    s->m.frame_bits = 8*(s->c.bytestream - s->c.bytestream_start);
-    s->m.p_tex_bits = s->m.frame_bits - s->m.misc_bits - s->m.mv_bits;
-    s->m.current_picture.f.display_picture_number =
-    s->m.current_picture.f.coded_picture_number   = avctx->frame_number;
-    s->m.current_picture.f.quality                = pic->quality;
-    s->m.total_bits += 8*(s->c.bytestream - s->c.bytestream_start);
-    if(s->pass1_rc)
-        if (ff_rate_estimate_qscale(&s->m, 0) < 0)
-            return -1;
-    if(avctx->flags&CODEC_FLAG_PASS1)
-        ff_write_pass1_stats(&s->m);
-    s->m.last_pict_type = s->m.pict_type;
-    avctx->frame_bits = s->m.frame_bits;
-    avctx->mv_bits = s->m.mv_bits;
-    avctx->misc_bits = s->m.misc_bits;
-    avctx->p_tex_bits = s->m.p_tex_bits;
-
-    emms_c();
-
-    pkt->size = ff_rac_terminate(c);
-    if (avctx->coded_frame->key_frame)
-        pkt->flags |= AV_PKT_FLAG_KEY;
-    *got_packet = 1;
-
-    return 0;
-}
-
-static av_cold int encode_end(AVCodecContext *avctx)
-{
-    SnowContext *s = avctx->priv_data;
-
-    ff_snow_common_end(s);
-    if (s->input_picture.data[0])
-        avctx->release_buffer(avctx, &s->input_picture);
-    av_free(avctx->stats_out);
-
-    return 0;
-}
-
-#define OFFSET(x) offsetof(SnowContext, x)
-#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
-static const AVOption options[] = {
-    { "memc_only",      "Only do ME/MC (I frames -> ref, P frame -> ME+MC).",   OFFSET(memc_only), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
-    { NULL },
-};
-
-static const AVClass snowenc_class = {
-    .class_name = "snow encoder",
-    .item_name  = av_default_item_name,
-    .option     = options,
-    .version    = LIBAVUTIL_VERSION_INT,
-};
-
-AVCodec ff_snow_encoder = {
-    .name           = "snow",
-    .type           = AVMEDIA_TYPE_VIDEO,
-    .id             = AV_CODEC_ID_SNOW,
-    .priv_data_size = sizeof(SnowContext),
-    .init           = encode_init,
-    .encode2        = encode_frame,
-    .close          = encode_end,
-    .long_name      = NULL_IF_CONFIG_SMALL("Snow"),
-    .priv_class     = &snowenc_class,
-};