Drop Snow codec

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

1 files changed, 0 insertions, 678 deletions

diff --git a/libavcodec/snow.c b/libavcodec/snow.c
deleted file mode 100644
index 153e5b2286..0000000000
--- a/libavcodec/snow.c
+++ /dev/null
@@ -1,678 +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 "dwt.h"
-#include "internal.h"
-#include "snow.h"
-#include "snowdata.h"
-
-#include "rangecoder.h"
-#include "mathops.h"
-#include "h263.h"
-
-#undef NDEBUG
-#include <assert.h>
-
-
-void ff_snow_inner_add_yblock(const uint8_t *obmc, const int obmc_stride, uint8_t * * block, int b_w, int b_h,
-                              int src_x, int src_y, int src_stride, slice_buffer * sb, int add, uint8_t * dst8){
-    int y, x;
-    IDWTELEM * dst;
-    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);
-        dst = slice_buffer_get_line(sb, src_y + y);
-        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 + src_x];
-                v = (v + (1<<(FRAC_BITS-1))) >> FRAC_BITS;
-                if(v&(~255)) v= ~(v>>31);
-                dst8[x + y*src_stride] = v;
-            }else{
-                dst[x + src_x] -= v;
-            }
-        }
-    }
-}
-
-void ff_snow_reset_contexts(SnowContext *s){ //FIXME better initial contexts
-    int plane_index, level, orientation;
-
-    for(plane_index=0; plane_index<3; plane_index++){
-        for(level=0; level<MAX_DECOMPOSITIONS; level++){
-            for(orientation=level ? 1:0; orientation<4; orientation++){
-                memset(s->plane[plane_index].band[level][orientation].state, MID_STATE, sizeof(s->plane[plane_index].band[level][orientation].state));
-            }
-        }
-    }
-    memset(s->header_state, MID_STATE, sizeof(s->header_state));
-    memset(s->block_state, MID_STATE, sizeof(s->block_state));
-}
-
-int ff_snow_alloc_blocks(SnowContext *s){
-    int w= -((-s->avctx->width )>>LOG2_MB_SIZE);
-    int h= -((-s->avctx->height)>>LOG2_MB_SIZE);
-
-    s->b_width = w;
-    s->b_height= h;
-
-    av_free(s->block);
-    s->block= av_mallocz(w * h * sizeof(BlockNode) << (s->block_max_depth*2));
-    return 0;
-}
-
-static void init_qexp(void){
-    int i;
-    double v=128;
-
-    for(i=0; i<QROOT; i++){
-        ff_qexp[i]= lrintf(v);
-        v *= pow(2, 1.0 / QROOT);
-    }
-}
-static void mc_block(Plane *p, uint8_t *dst, const uint8_t *src, int stride, int b_w, int b_h, int dx, int dy){
-    static const uint8_t weight[64]={
-    8,7,6,5,4,3,2,1,
-    7,7,0,0,0,0,0,1,
-    6,0,6,0,0,0,2,0,
-    5,0,0,5,0,3,0,0,
-    4,0,0,0,4,0,0,0,
-    3,0,0,5,0,3,0,0,
-    2,0,6,0,0,0,2,0,
-    1,7,0,0,0,0,0,1,
-    };
-
-    static const uint8_t brane[256]={
-    0x00,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x11,0x12,0x12,0x12,0x12,0x12,0x12,0x12,
-    0x04,0x05,0xcc,0xcc,0xcc,0xcc,0xcc,0x41,0x15,0x16,0xcc,0xcc,0xcc,0xcc,0xcc,0x52,
-    0x04,0xcc,0x05,0xcc,0xcc,0xcc,0x41,0xcc,0x15,0xcc,0x16,0xcc,0xcc,0xcc,0x52,0xcc,
-    0x04,0xcc,0xcc,0x05,0xcc,0x41,0xcc,0xcc,0x15,0xcc,0xcc,0x16,0xcc,0x52,0xcc,0xcc,
-    0x04,0xcc,0xcc,0xcc,0x41,0xcc,0xcc,0xcc,0x15,0xcc,0xcc,0xcc,0x16,0xcc,0xcc,0xcc,
-    0x04,0xcc,0xcc,0x41,0xcc,0x05,0xcc,0xcc,0x15,0xcc,0xcc,0x52,0xcc,0x16,0xcc,0xcc,
-    0x04,0xcc,0x41,0xcc,0xcc,0xcc,0x05,0xcc,0x15,0xcc,0x52,0xcc,0xcc,0xcc,0x16,0xcc,
-    0x04,0x41,0xcc,0xcc,0xcc,0xcc,0xcc,0x05,0x15,0x52,0xcc,0xcc,0xcc,0xcc,0xcc,0x16,
-    0x44,0x45,0x45,0x45,0x45,0x45,0x45,0x45,0x55,0x56,0x56,0x56,0x56,0x56,0x56,0x56,
-    0x48,0x49,0xcc,0xcc,0xcc,0xcc,0xcc,0x85,0x59,0x5A,0xcc,0xcc,0xcc,0xcc,0xcc,0x96,
-    0x48,0xcc,0x49,0xcc,0xcc,0xcc,0x85,0xcc,0x59,0xcc,0x5A,0xcc,0xcc,0xcc,0x96,0xcc,
-    0x48,0xcc,0xcc,0x49,0xcc,0x85,0xcc,0xcc,0x59,0xcc,0xcc,0x5A,0xcc,0x96,0xcc,0xcc,
-    0x48,0xcc,0xcc,0xcc,0x49,0xcc,0xcc,0xcc,0x59,0xcc,0xcc,0xcc,0x96,0xcc,0xcc,0xcc,
-    0x48,0xcc,0xcc,0x85,0xcc,0x49,0xcc,0xcc,0x59,0xcc,0xcc,0x96,0xcc,0x5A,0xcc,0xcc,
-    0x48,0xcc,0x85,0xcc,0xcc,0xcc,0x49,0xcc,0x59,0xcc,0x96,0xcc,0xcc,0xcc,0x5A,0xcc,
-    0x48,0x85,0xcc,0xcc,0xcc,0xcc,0xcc,0x49,0x59,0x96,0xcc,0xcc,0xcc,0xcc,0xcc,0x5A,
-    };
-
-    static const uint8_t needs[16]={
-    0,1,0,0,
-    2,4,2,0,
-    0,1,0,0,
-    15
-    };
-
-    int x, y, b, r, l;
-    int16_t tmpIt   [64*(32+HTAPS_MAX)];
-    uint8_t tmp2t[3][64*(32+HTAPS_MAX)];
-    int16_t *tmpI= tmpIt;
-    uint8_t *tmp2= tmp2t[0];
-    const uint8_t *hpel[11];
-    assert(dx<16 && dy<16);
-    r= brane[dx + 16*dy]&15;
-    l= brane[dx + 16*dy]>>4;
-
-    b= needs[l] | needs[r];
-    if(p && !p->diag_mc)
-        b= 15;
-
-    if(b&5){
-        for(y=0; y < b_h+HTAPS_MAX-1; y++){
-            for(x=0; x < b_w; x++){
-                int a_1=src[x + HTAPS_MAX/2-4];
-                int a0= src[x + HTAPS_MAX/2-3];
-                int a1= src[x + HTAPS_MAX/2-2];
-                int a2= src[x + HTAPS_MAX/2-1];
-                int a3= src[x + HTAPS_MAX/2+0];
-                int a4= src[x + HTAPS_MAX/2+1];
-                int a5= src[x + HTAPS_MAX/2+2];
-                int a6= src[x + HTAPS_MAX/2+3];
-                int am=0;
-                if(!p || p->fast_mc){
-                    am= 20*(a2+a3) - 5*(a1+a4) + (a0+a5);
-                    tmpI[x]= am;
-                    am= (am+16)>>5;
-                }else{
-                    am= p->hcoeff[0]*(a2+a3) + p->hcoeff[1]*(a1+a4) + p->hcoeff[2]*(a0+a5) + p->hcoeff[3]*(a_1+a6);
-                    tmpI[x]= am;
-                    am= (am+32)>>6;
-                }
-
-                if(am&(~255)) am= ~(am>>31);
-                tmp2[x]= am;
-            }
-            tmpI+= 64;
-            tmp2+= 64;
-            src += stride;
-        }
-        src -= stride*y;
-    }
-    src += HTAPS_MAX/2 - 1;
-    tmp2= tmp2t[1];
-
-    if(b&2){
-        for(y=0; y < b_h; y++){
-            for(x=0; x < b_w+1; x++){
-                int a_1=src[x + (HTAPS_MAX/2-4)*stride];
-                int a0= src[x + (HTAPS_MAX/2-3)*stride];
-                int a1= src[x + (HTAPS_MAX/2-2)*stride];
-                int a2= src[x + (HTAPS_MAX/2-1)*stride];
-                int a3= src[x + (HTAPS_MAX/2+0)*stride];
-                int a4= src[x + (HTAPS_MAX/2+1)*stride];
-                int a5= src[x + (HTAPS_MAX/2+2)*stride];
-                int a6= src[x + (HTAPS_MAX/2+3)*stride];
-                int am=0;
-                if(!p || p->fast_mc)
-                    am= (20*(a2+a3) - 5*(a1+a4) + (a0+a5) + 16)>>5;
-                else
-                    am= (p->hcoeff[0]*(a2+a3) + p->hcoeff[1]*(a1+a4) + p->hcoeff[2]*(a0+a5) + p->hcoeff[3]*(a_1+a6) + 32)>>6;
-
-                if(am&(~255)) am= ~(am>>31);
-                tmp2[x]= am;
-            }
-            src += stride;
-            tmp2+= 64;
-        }
-        src -= stride*y;
-    }
-    src += stride*(HTAPS_MAX/2 - 1);
-    tmp2= tmp2t[2];
-    tmpI= tmpIt;
-    if(b&4){
-        for(y=0; y < b_h; y++){
-            for(x=0; x < b_w; x++){
-                int a_1=tmpI[x + (HTAPS_MAX/2-4)*64];
-                int a0= tmpI[x + (HTAPS_MAX/2-3)*64];
-                int a1= tmpI[x + (HTAPS_MAX/2-2)*64];
-                int a2= tmpI[x + (HTAPS_MAX/2-1)*64];
-                int a3= tmpI[x + (HTAPS_MAX/2+0)*64];
-                int a4= tmpI[x + (HTAPS_MAX/2+1)*64];
-                int a5= tmpI[x + (HTAPS_MAX/2+2)*64];
-                int a6= tmpI[x + (HTAPS_MAX/2+3)*64];
-                int am=0;
-                if(!p || p->fast_mc)
-                    am= (20*(a2+a3) - 5*(a1+a4) + (a0+a5) + 512)>>10;
-                else
-                    am= (p->hcoeff[0]*(a2+a3) + p->hcoeff[1]*(a1+a4) + p->hcoeff[2]*(a0+a5) + p->hcoeff[3]*(a_1+a6) + 2048)>>12;
-                if(am&(~255)) am= ~(am>>31);
-                tmp2[x]= am;
-            }
-            tmpI+= 64;
-            tmp2+= 64;
-        }
-    }
-
-    hpel[ 0]= src;
-    hpel[ 1]= tmp2t[0] + 64*(HTAPS_MAX/2-1);
-    hpel[ 2]= src + 1;
-
-    hpel[ 4]= tmp2t[1];
-    hpel[ 5]= tmp2t[2];
-    hpel[ 6]= tmp2t[1] + 1;
-
-    hpel[ 8]= src + stride;
-    hpel[ 9]= hpel[1] + 64;
-    hpel[10]= hpel[8] + 1;
-
-#define MC_STRIDE(x) (needs[x] ? 64 : stride)
-
-    if(b==15){
-        int dxy = dx / 8 + dy / 8 * 4;
-        const uint8_t *src1 = hpel[dxy    ];
-        const uint8_t *src2 = hpel[dxy + 1];
-        const uint8_t *src3 = hpel[dxy + 4];
-        const uint8_t *src4 = hpel[dxy + 5];
-        int stride1 = MC_STRIDE(dxy);
-        int stride2 = MC_STRIDE(dxy + 1);
-        int stride3 = MC_STRIDE(dxy + 4);
-        int stride4 = MC_STRIDE(dxy + 5);
-        dx&=7;
-        dy&=7;
-        for(y=0; y < b_h; y++){
-            for(x=0; x < b_w; x++){
-                dst[x]= ((8-dx)*(8-dy)*src1[x] + dx*(8-dy)*src2[x]+
-                         (8-dx)*   dy *src3[x] + dx*   dy *src4[x]+32)>>6;
-            }
-            src1+=stride1;
-            src2+=stride2;
-            src3+=stride3;
-            src4+=stride4;
-            dst +=stride;
-        }
-    }else{
-        const uint8_t *src1= hpel[l];
-        const uint8_t *src2= hpel[r];
-        int stride1 = MC_STRIDE(l);
-        int stride2 = MC_STRIDE(r);
-        int a= weight[((dx&7) + (8*(dy&7)))];
-        int b= 8-a;
-        for(y=0; y < b_h; y++){
-            for(x=0; x < b_w; x++){
-                dst[x]= (a*src1[x] + b*src2[x] + 4)>>3;
-            }
-            src1+=stride1;
-            src2+=stride2;
-            dst +=stride;
-        }
-    }
-}
-
-void ff_snow_pred_block(SnowContext *s, uint8_t *dst, uint8_t *tmp, int stride, int sx, int sy, int b_w, int b_h, BlockNode *block, int plane_index, int w, int h){
-    if(block->type & BLOCK_INTRA){
-        int x, y;
-        const unsigned color  = block->color[plane_index];
-        const unsigned color4 = color*0x01010101;
-        if(b_w==32){
-            for(y=0; y < b_h; y++){
-                *(uint32_t*)&dst[0 + y*stride]= color4;
-                *(uint32_t*)&dst[4 + y*stride]= color4;
-                *(uint32_t*)&dst[8 + y*stride]= color4;
-                *(uint32_t*)&dst[12+ y*stride]= color4;
-                *(uint32_t*)&dst[16+ y*stride]= color4;
-                *(uint32_t*)&dst[20+ y*stride]= color4;
-                *(uint32_t*)&dst[24+ y*stride]= color4;
-                *(uint32_t*)&dst[28+ y*stride]= color4;
-            }
-        }else if(b_w==16){
-            for(y=0; y < b_h; y++){
-                *(uint32_t*)&dst[0 + y*stride]= color4;
-                *(uint32_t*)&dst[4 + y*stride]= color4;
-                *(uint32_t*)&dst[8 + y*stride]= color4;
-                *(uint32_t*)&dst[12+ y*stride]= color4;
-            }
-        }else if(b_w==8){
-            for(y=0; y < b_h; y++){
-                *(uint32_t*)&dst[0 + y*stride]= color4;
-                *(uint32_t*)&dst[4 + y*stride]= color4;
-            }
-        }else if(b_w==4){
-            for(y=0; y < b_h; y++){
-                *(uint32_t*)&dst[0 + y*stride]= color4;
-            }
-        }else{
-            for(y=0; y < b_h; y++){
-                for(x=0; x < b_w; x++){
-                    dst[x + y*stride]= color;
-                }
-            }
-        }
-    }else{
-        uint8_t *src= s->last_picture[block->ref].data[plane_index];
-        const int scale= plane_index ?  s->mv_scale : 2*s->mv_scale;
-        int mx= block->mx*scale;
-        int my= block->my*scale;
-        const int dx= mx&15;
-        const int dy= my&15;
-        const int tab_index= 3 - (b_w>>2) + (b_w>>4);
-        sx += (mx>>4) - (HTAPS_MAX/2-1);
-        sy += (my>>4) - (HTAPS_MAX/2-1);
-        src += sx + sy*stride;
-        if(   (unsigned)sx >= w - b_w - (HTAPS_MAX-2)
-           || (unsigned)sy >= h - b_h - (HTAPS_MAX-2)){
-            s->vdsp.emulated_edge_mc(tmp + MB_SIZE, src, stride, b_w+HTAPS_MAX-1, b_h+HTAPS_MAX-1, sx, sy, w, h);
-            src= tmp + MB_SIZE;
-        }
-//        assert(b_w == b_h || 2*b_w == b_h || b_w == 2*b_h);
-//        assert(!(b_w&(b_w-1)));
-        assert(b_w>1 && b_h>1);
-        assert((tab_index>=0 && tab_index<4) || b_w==32);
-        if((dx&3) || (dy&3) || !(b_w == b_h || 2*b_w == b_h || b_w == 2*b_h) || (b_w&(b_w-1)) || !s->plane[plane_index].fast_mc )
-            mc_block(&s->plane[plane_index], dst, src, stride, b_w, b_h, dx, dy);
-        else if(b_w==32){
-            int y;
-            for(y=0; y<b_h; y+=16){
-                s->dsp.put_h264_qpel_pixels_tab[0][dy+(dx>>2)](dst + y*stride, src + 3 + (y+3)*stride,stride);
-                s->dsp.put_h264_qpel_pixels_tab[0][dy+(dx>>2)](dst + 16 + y*stride, src + 19 + (y+3)*stride,stride);
-            }
-        }else if(b_w==b_h)
-            s->dsp.put_h264_qpel_pixels_tab[tab_index  ][dy+(dx>>2)](dst,src + 3 + 3*stride,stride);
-        else if(b_w==2*b_h){
-            s->dsp.put_h264_qpel_pixels_tab[tab_index+1][dy+(dx>>2)](dst    ,src + 3       + 3*stride,stride);
-            s->dsp.put_h264_qpel_pixels_tab[tab_index+1][dy+(dx>>2)](dst+b_h,src + 3 + b_h + 3*stride,stride);
-        }else{
-            assert(2*b_w==b_h);
-            s->dsp.put_h264_qpel_pixels_tab[tab_index  ][dy+(dx>>2)](dst           ,src + 3 + 3*stride           ,stride);
-            s->dsp.put_h264_qpel_pixels_tab[tab_index  ][dy+(dx>>2)](dst+b_w*stride,src + 3 + 3*stride+b_w*stride,stride);
-        }
-    }
-}
-
-#define mca(dx,dy,b_w)\
-static void mc_block_hpel ## dx ## dy ## b_w(uint8_t *dst, const uint8_t *src, int stride, int h){\
-    assert(h==b_w);\
-    mc_block(NULL, dst, src-(HTAPS_MAX/2-1)-(HTAPS_MAX/2-1)*stride, stride, b_w, b_w, dx, dy);\
-}
-
-mca( 0, 0,16)
-mca( 8, 0,16)
-mca( 0, 8,16)
-mca( 8, 8,16)
-mca( 0, 0,8)
-mca( 8, 0,8)
-mca( 0, 8,8)
-mca( 8, 8,8)
-
-av_cold int ff_snow_common_init(AVCodecContext *avctx){
-    SnowContext *s = avctx->priv_data;
-    int width, height;
-    int i, j, ret;
-    int emu_buf_size;
-
-    s->avctx= avctx;
-    s->max_ref_frames=1; //just make sure its not an invalid value in case of no initial keyframe
-
-    ff_dsputil_init(&s->dsp, avctx);
-    ff_videodsp_init(&s->vdsp, 8);
-    ff_dwt_init(&s->dwt);
-
-#define mcf(dx,dy)\
-    s->dsp.put_qpel_pixels_tab       [0][dy+dx/4]=\
-    s->dsp.put_no_rnd_qpel_pixels_tab[0][dy+dx/4]=\
-        s->dsp.put_h264_qpel_pixels_tab[0][dy+dx/4];\
-    s->dsp.put_qpel_pixels_tab       [1][dy+dx/4]=\
-    s->dsp.put_no_rnd_qpel_pixels_tab[1][dy+dx/4]=\
-        s->dsp.put_h264_qpel_pixels_tab[1][dy+dx/4];
-
-    mcf( 0, 0)
-    mcf( 4, 0)
-    mcf( 8, 0)
-    mcf(12, 0)
-    mcf( 0, 4)
-    mcf( 4, 4)
-    mcf( 8, 4)
-    mcf(12, 4)
-    mcf( 0, 8)
-    mcf( 4, 8)
-    mcf( 8, 8)
-    mcf(12, 8)
-    mcf( 0,12)
-    mcf( 4,12)
-    mcf( 8,12)
-    mcf(12,12)
-
-#define mcfh(dx,dy)\
-    s->dsp.put_pixels_tab       [0][dy/4+dx/8]=\
-    s->dsp.put_no_rnd_pixels_tab[0][dy/4+dx/8]=\
-        mc_block_hpel ## dx ## dy ## 16;\
-    s->dsp.put_pixels_tab       [1][dy/4+dx/8]=\
-    s->dsp.put_no_rnd_pixels_tab[1][dy/4+dx/8]=\
-        mc_block_hpel ## dx ## dy ## 8;
-
-    mcfh(0, 0)
-    mcfh(8, 0)
-    mcfh(0, 8)
-    mcfh(8, 8)
-
-    init_qexp();
-
-//    dec += FFMAX(s->chroma_h_shift, s->chroma_v_shift);
-
-    width= s->avctx->width;
-    height= s->avctx->height;
-
-    FF_ALLOCZ_OR_GOTO(avctx, s->spatial_idwt_buffer, width * height * sizeof(IDWTELEM), fail);
-    FF_ALLOCZ_OR_GOTO(avctx, s->spatial_dwt_buffer,  width * height * sizeof(DWTELEM),  fail); //FIXME this does not belong here
-    FF_ALLOCZ_OR_GOTO(avctx, s->temp_dwt_buffer,     width * sizeof(DWTELEM),  fail);
-    FF_ALLOCZ_OR_GOTO(avctx, s->temp_idwt_buffer,    width * sizeof(IDWTELEM), fail);
-    FF_ALLOC_OR_GOTO(avctx,  s->run_buffer,          ((width + 1) >> 1) * ((height + 1) >> 1) * sizeof(*s->run_buffer), fail);
-
-    for(i=0; i<MAX_REF_FRAMES; i++)
-        for(j=0; j<MAX_REF_FRAMES; j++)
-            ff_scale_mv_ref[i][j] = 256*(i+1)/(j+1);
-
-    if ((ret = ff_get_buffer(s->avctx, &s->mconly_picture)) < 0) {
-        av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
-        return ret;
-    }
-    FF_ALLOC_OR_GOTO(avctx, s->scratchbuf, s->mconly_picture.linesize[0]*7*MB_SIZE, fail);
-    emu_buf_size = s->mconly_picture.linesize[0] * (2 * MB_SIZE + HTAPS_MAX - 1);
-    FF_ALLOC_OR_GOTO(avctx, s->emu_edge_buffer, emu_buf_size, fail);
-
-    return 0;
-fail:
-    return AVERROR(ENOMEM);
-}
-
-int ff_snow_common_init_after_header(AVCodecContext *avctx) {
-    SnowContext *s = avctx->priv_data;
-    int plane_index, level, orientation;
-
-    for(plane_index=0; plane_index<3; plane_index++){
-        int w= s->avctx->width;
-        int h= s->avctx->height;
-
-        if(plane_index){
-            w>>= s->chroma_h_shift;
-            h>>= s->chroma_v_shift;
-        }
-        s->plane[plane_index].width = w;
-        s->plane[plane_index].height= h;
-
-        for(level=s->spatial_decomposition_count-1; level>=0; level--){
-            for(orientation=level ? 1 : 0; orientation<4; orientation++){
-                SubBand *b= &s->plane[plane_index].band[level][orientation];
-
-                b->buf= s->spatial_dwt_buffer;
-                b->level= level;
-                b->stride= s->plane[plane_index].width << (s->spatial_decomposition_count - level);
-                b->width = (w + !(orientation&1))>>1;
-                b->height= (h + !(orientation>1))>>1;
-
-                b->stride_line = 1 << (s->spatial_decomposition_count - level);
-                b->buf_x_offset = 0;
-                b->buf_y_offset = 0;
-
-                if(orientation&1){
-                    b->buf += (w+1)>>1;
-                    b->buf_x_offset = (w+1)>>1;
-                }
-                if(orientation>1){
-                    b->buf += b->stride>>1;
-                    b->buf_y_offset = b->stride_line >> 1;
-                }
-                b->ibuf= s->spatial_idwt_buffer + (b->buf - s->spatial_dwt_buffer);
-
-                if(level)
-                    b->parent= &s->plane[plane_index].band[level-1][orientation];
-                //FIXME avoid this realloc
-                av_freep(&b->x_coeff);
-                b->x_coeff=av_mallocz(((b->width+1) * b->height+1)*sizeof(x_and_coeff));
-            }
-            w= (w+1)>>1;
-            h= (h+1)>>1;
-        }
-    }
-
-    return 0;
-}
-
-#define USE_HALFPEL_PLANE 0
-
-static void halfpel_interpol(SnowContext *s, uint8_t *halfpel[4][4], AVFrame *frame){
-    int p,x,y;
-
-    for(p=0; p<3; p++){
-        int is_chroma= !!p;
-        int w= s->avctx->width  >>is_chroma;
-        int h= s->avctx->height >>is_chroma;
-        int ls= frame->linesize[p];
-        uint8_t *src= frame->data[p];
-
-        halfpel[1][p] = (uint8_t*) av_malloc(ls * (h + 2 * EDGE_WIDTH)) + EDGE_WIDTH * (1 + ls);
-        halfpel[2][p] = (uint8_t*) av_malloc(ls * (h + 2 * EDGE_WIDTH)) + EDGE_WIDTH * (1 + ls);
-        halfpel[3][p] = (uint8_t*) av_malloc(ls * (h + 2 * EDGE_WIDTH)) + EDGE_WIDTH * (1 + ls);
-
-        halfpel[0][p]= src;
-        for(y=0; y<h; y++){
-            for(x=0; x<w; x++){
-                int i= y*ls + x;
-
-                halfpel[1][p][i]= (20*(src[i] + src[i+1]) - 5*(src[i-1] + src[i+2]) + (src[i-2] + src[i+3]) + 16 )>>5;
-            }
-        }
-        for(y=0; y<h; y++){
-            for(x=0; x<w; x++){
-                int i= y*ls + x;
-
-                halfpel[2][p][i]= (20*(src[i] + src[i+ls]) - 5*(src[i-ls] + src[i+2*ls]) + (src[i-2*ls] + src[i+3*ls]) + 16 )>>5;
-            }
-        }
-        src= halfpel[1][p];
-        for(y=0; y<h; y++){
-            for(x=0; x<w; x++){
-                int i= y*ls + x;
-
-                halfpel[3][p][i]= (20*(src[i] + src[i+ls]) - 5*(src[i-ls] + src[i+2*ls]) + (src[i-2*ls] + src[i+3*ls]) + 16 )>>5;
-            }
-        }
-
-//FIXME border!
-    }
-}
-
-void ff_snow_release_buffer(AVCodecContext *avctx)
-{
-    SnowContext *s = avctx->priv_data;
-    int i;
-
-    if(s->last_picture[s->max_ref_frames-1].data[0]){
-        avctx->release_buffer(avctx, &s->last_picture[s->max_ref_frames-1]);
-        for(i=0; i<9; i++)
-            if(s->halfpel_plane[s->max_ref_frames-1][1+i/3][i%3])
-                av_free(s->halfpel_plane[s->max_ref_frames-1][1+i/3][i%3] - EDGE_WIDTH*(1+s->current_picture.linesize[i%3]));
-    }
-}
-
-int ff_snow_frame_start(SnowContext *s){
-   AVFrame tmp;
-   int w= s->avctx->width; //FIXME round up to x16 ?
-   int h= s->avctx->height;
-
-    if (s->current_picture.data[0] && !(s->avctx->flags&CODEC_FLAG_EMU_EDGE)) {
-        s->dsp.draw_edges(s->current_picture.data[0],
-                          s->current_picture.linesize[0], w   , h   ,
-                          EDGE_WIDTH  , EDGE_WIDTH  , EDGE_TOP | EDGE_BOTTOM);
-        s->dsp.draw_edges(s->current_picture.data[1],
-                          s->current_picture.linesize[1], w>>1, h>>1,
-                          EDGE_WIDTH/2, EDGE_WIDTH/2, EDGE_TOP | EDGE_BOTTOM);
-        s->dsp.draw_edges(s->current_picture.data[2],
-                          s->current_picture.linesize[2], w>>1, h>>1,
-                          EDGE_WIDTH/2, EDGE_WIDTH/2, EDGE_TOP | EDGE_BOTTOM);
-    }
-
-    ff_snow_release_buffer(s->avctx);
-
-    tmp= s->last_picture[s->max_ref_frames-1];
-    memmove(s->last_picture+1, s->last_picture, (s->max_ref_frames-1)*sizeof(AVFrame));
-    memmove(s->halfpel_plane+1, s->halfpel_plane, (s->max_ref_frames-1)*sizeof(void*)*4*4);
-    if(USE_HALFPEL_PLANE && s->current_picture.data[0])
-        halfpel_interpol(s, s->halfpel_plane[0], &s->current_picture);
-    s->last_picture[0]= s->current_picture;
-    s->current_picture= tmp;
-
-    if(s->keyframe){
-        s->ref_frames= 0;
-    }else{
-        int i;
-        for(i=0; i<s->max_ref_frames && s->last_picture[i].data[0]; i++)
-            if(i && s->last_picture[i-1].key_frame)
-                break;
-        s->ref_frames= i;
-        if(s->ref_frames==0){
-            av_log(s->avctx,AV_LOG_ERROR, "No reference frames\n");
-            return -1;
-        }
-    }
-
-    s->current_picture.reference= 1;
-    if(ff_get_buffer(s->avctx, &s->current_picture) < 0){
-        av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
-        return -1;
-    }
-
-    s->current_picture.key_frame= s->keyframe;
-
-    return 0;
-}
-
-av_cold void ff_snow_common_end(SnowContext *s)
-{
-    int plane_index, level, orientation, i;
-
-    av_freep(&s->spatial_dwt_buffer);
-    av_freep(&s->temp_dwt_buffer);
-    av_freep(&s->spatial_idwt_buffer);
-    av_freep(&s->temp_idwt_buffer);
-    av_freep(&s->run_buffer);
-
-    s->m.me.temp= NULL;
-    av_freep(&s->m.me.scratchpad);
-    av_freep(&s->m.me.map);
-    av_freep(&s->m.me.score_map);
-    av_freep(&s->m.obmc_scratchpad);
-
-    av_freep(&s->block);
-    av_freep(&s->scratchbuf);
-    av_freep(&s->emu_edge_buffer);
-
-    for(i=0; i<MAX_REF_FRAMES; i++){
-        av_freep(&s->ref_mvs[i]);
-        av_freep(&s->ref_scores[i]);
-        if(s->last_picture[i].data[0])
-            s->avctx->release_buffer(s->avctx, &s->last_picture[i]);
-    }
-
-    for(plane_index=0; plane_index<3; plane_index++){
-        for(level=s->spatial_decomposition_count-1; level>=0; level--){
-            for(orientation=level ? 1 : 0; orientation<4; orientation++){
-                SubBand *b= &s->plane[plane_index].band[level][orientation];
-
-                av_freep(&b->x_coeff);
-            }
-        }
-    }
-    if (s->mconly_picture.data[0])
-        s->avctx->release_buffer(s->avctx, &s->mconly_picture);
-    if (s->current_picture.data[0])
-        s->avctx->release_buffer(s->avctx, &s->current_picture);
-}