yading@10: /*
yading@10:  * Copyright (C) 2004 Michael Niedermayer <michaelni@gmx.at>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "libavutil/intmath.h"
yading@10: #include "libavutil/log.h"
yading@10: #include "libavutil/opt.h"
yading@10: #include "avcodec.h"
yading@10: #include "dsputil.h"
yading@10: #include "snow_dwt.h"
yading@10: #include "internal.h"
yading@10: #include "snow.h"
yading@10: 
yading@10: #include "rangecoder.h"
yading@10: #include "mathops.h"
yading@10: 
yading@10: #include "mpegvideo.h"
yading@10: #include "h263.h"
yading@10: 
yading@10: #undef NDEBUG
yading@10: #include <assert.h>
yading@10: 
yading@10: static av_always_inline void predict_slice_buffered(SnowContext *s, slice_buffer * sb, IDWTELEM * old_buffer, int plane_index, int add, int mb_y){
yading@10:     Plane *p= &s->plane[plane_index];
yading@10:     const int mb_w= s->b_width  << s->block_max_depth;
yading@10:     const int mb_h= s->b_height << s->block_max_depth;
yading@10:     int x, y, mb_x;
yading@10:     int block_size = MB_SIZE >> s->block_max_depth;
yading@10:     int block_w    = plane_index ? block_size>>s->chroma_h_shift : block_size;
yading@10:     int block_h    = plane_index ? block_size>>s->chroma_v_shift : block_size;
yading@10:     const uint8_t *obmc  = plane_index ? ff_obmc_tab[s->block_max_depth+s->chroma_h_shift] : ff_obmc_tab[s->block_max_depth];
yading@10:     int obmc_stride= plane_index ? (2*block_size)>>s->chroma_h_shift : 2*block_size;
yading@10:     int ref_stride= s->current_picture.linesize[plane_index];
yading@10:     uint8_t *dst8= s->current_picture.data[plane_index];
yading@10:     int w= p->width;
yading@10:     int h= p->height;
yading@10: 
yading@10:     if(s->keyframe || (s->avctx->debug&512)){
yading@10:         if(mb_y==mb_h)
yading@10:             return;
yading@10: 
yading@10:         if(add){
yading@10:             for(y=block_h*mb_y; y<FFMIN(h,block_h*(mb_y+1)); y++){
yading@10: //                DWTELEM * line = slice_buffer_get_line(sb, y);
yading@10:                 IDWTELEM * line = sb->line[y];
yading@10:                 for(x=0; x<w; x++){
yading@10: //                    int v= buf[x + y*w] + (128<<FRAC_BITS) + (1<<(FRAC_BITS-1));
yading@10:                     int v= line[x] + (128<<FRAC_BITS) + (1<<(FRAC_BITS-1));
yading@10:                     v >>= FRAC_BITS;
yading@10:                     if(v&(~255)) v= ~(v>>31);
yading@10:                     dst8[x + y*ref_stride]= v;
yading@10:                 }
yading@10:             }
yading@10:         }else{
yading@10:             for(y=block_h*mb_y; y<FFMIN(h,block_h*(mb_y+1)); y++){
yading@10: //                DWTELEM * line = slice_buffer_get_line(sb, y);
yading@10:                 IDWTELEM * line = sb->line[y];
yading@10:                 for(x=0; x<w; x++){
yading@10:                     line[x] -= 128 << FRAC_BITS;
yading@10: //                    buf[x + y*w]-= 128<<FRAC_BITS;
yading@10:                 }
yading@10:             }
yading@10:         }
yading@10: 
yading@10:         return;
yading@10:     }
yading@10: 
yading@10:     for(mb_x=0; mb_x<=mb_w; mb_x++){
yading@10:         add_yblock(s, 1, sb, old_buffer, dst8, obmc,
yading@10:                    block_w*mb_x - block_w/2,
yading@10:                    block_h*mb_y - block_h/2,
yading@10:                    block_w, block_h,
yading@10:                    w, h,
yading@10:                    w, ref_stride, obmc_stride,
yading@10:                    mb_x - 1, mb_y - 1,
yading@10:                    add, 0, plane_index);
yading@10:     }
yading@10: }
yading@10: 
yading@10: static inline void decode_subband_slice_buffered(SnowContext *s, SubBand *b, slice_buffer * sb, int start_y, int h, int save_state[1]){
yading@10:     const int w= b->width;
yading@10:     int y;
yading@10:     const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
yading@10:     int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
yading@10:     int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
yading@10:     int new_index = 0;
yading@10: 
yading@10:     if(b->ibuf == s->spatial_idwt_buffer || s->qlog == LOSSLESS_QLOG){
yading@10:         qadd= 0;
yading@10:         qmul= 1<<QEXPSHIFT;
yading@10:     }
yading@10: 
yading@10:     /* If we are on the second or later slice, restore our index. */
yading@10:     if (start_y != 0)
yading@10:         new_index = save_state[0];
yading@10: 
yading@10: 
yading@10:     for(y=start_y; y<h; y++){
yading@10:         int x = 0;
yading@10:         int v;
yading@10:         IDWTELEM * line = slice_buffer_get_line(sb, y * b->stride_line + b->buf_y_offset) + b->buf_x_offset;
yading@10:         memset(line, 0, b->width*sizeof(IDWTELEM));
yading@10:         v = b->x_coeff[new_index].coeff;
yading@10:         x = b->x_coeff[new_index++].x;
yading@10:         while(x < w){
yading@10:             register int t= ( (v>>1)*qmul + qadd)>>QEXPSHIFT;
yading@10:             register int u= -(v&1);
yading@10:             line[x] = (t^u) - u;
yading@10: 
yading@10:             v = b->x_coeff[new_index].coeff;
yading@10:             x = b->x_coeff[new_index++].x;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     /* Save our variables for the next slice. */
yading@10:     save_state[0] = new_index;
yading@10: 
yading@10:     return;
yading@10: }
yading@10: 
yading@10: static int decode_q_branch(SnowContext *s, int level, int x, int y){
yading@10:     const int w= s->b_width << s->block_max_depth;
yading@10:     const int rem_depth= s->block_max_depth - level;
yading@10:     const int index= (x + y*w) << rem_depth;
yading@10:     int trx= (x+1)<<rem_depth;
yading@10:     const BlockNode *left  = x ? &s->block[index-1] : &null_block;
yading@10:     const BlockNode *top   = y ? &s->block[index-w] : &null_block;
yading@10:     const BlockNode *tl    = y && x ? &s->block[index-w-1] : left;
yading@10:     const BlockNode *tr    = y && trx<w && ((x&1)==0 || level==0) ? &s->block[index-w+(1<<rem_depth)] : tl; //FIXME use lt
yading@10:     int s_context= 2*left->level + 2*top->level + tl->level + tr->level;
yading@10:     int res;
yading@10: 
yading@10:     if(s->keyframe){
yading@10:         set_blocks(s, level, x, y, null_block.color[0], null_block.color[1], null_block.color[2], null_block.mx, null_block.my, null_block.ref, BLOCK_INTRA);
yading@10:         return 0;
yading@10:     }
yading@10: 
yading@10:     if(level==s->block_max_depth || get_rac(&s->c, &s->block_state[4 + s_context])){
yading@10:         int type, mx, my;
yading@10:         int l = left->color[0];
yading@10:         int cb= left->color[1];
yading@10:         int cr= left->color[2];
yading@10:         int ref = 0;
yading@10:         int ref_context= av_log2(2*left->ref) + av_log2(2*top->ref);
yading@10:         int mx_context= av_log2(2*FFABS(left->mx - top->mx)) + 0*av_log2(2*FFABS(tr->mx - top->mx));
yading@10:         int my_context= av_log2(2*FFABS(left->my - top->my)) + 0*av_log2(2*FFABS(tr->my - top->my));
yading@10: 
yading@10:         type= get_rac(&s->c, &s->block_state[1 + left->type + top->type]) ? BLOCK_INTRA : 0;
yading@10: 
yading@10:         if(type){
yading@10:             pred_mv(s, &mx, &my, 0, left, top, tr);
yading@10:             l += get_symbol(&s->c, &s->block_state[32], 1);
yading@10:             cb+= get_symbol(&s->c, &s->block_state[64], 1);
yading@10:             cr+= get_symbol(&s->c, &s->block_state[96], 1);
yading@10:         }else{
yading@10:             if(s->ref_frames > 1)
yading@10:                 ref= get_symbol(&s->c, &s->block_state[128 + 1024 + 32*ref_context], 0);
yading@10:             if (ref >= s->ref_frames) {
yading@10:                 av_log(s->avctx, AV_LOG_ERROR, "Invalid ref\n");
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             }
yading@10:             pred_mv(s, &mx, &my, ref, left, top, tr);
yading@10:             mx+= get_symbol(&s->c, &s->block_state[128 + 32*(mx_context + 16*!!ref)], 1);
yading@10:             my+= get_symbol(&s->c, &s->block_state[128 + 32*(my_context + 16*!!ref)], 1);
yading@10:         }
yading@10:         set_blocks(s, level, x, y, l, cb, cr, mx, my, ref, type);
yading@10:     }else{
yading@10:         if ((res = decode_q_branch(s, level+1, 2*x+0, 2*y+0)) < 0 ||
yading@10:             (res = decode_q_branch(s, level+1, 2*x+1, 2*y+0)) < 0 ||
yading@10:             (res = decode_q_branch(s, level+1, 2*x+0, 2*y+1)) < 0 ||
yading@10:             (res = decode_q_branch(s, level+1, 2*x+1, 2*y+1)) < 0)
yading@10:             return res;
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static void dequantize_slice_buffered(SnowContext *s, slice_buffer * sb, SubBand *b, IDWTELEM *src, int stride, int start_y, int end_y){
yading@10:     const int w= b->width;
yading@10:     const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
yading@10:     const int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
yading@10:     const int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
yading@10:     int x,y;
yading@10: 
yading@10:     if(s->qlog == LOSSLESS_QLOG) return;
yading@10: 
yading@10:     for(y=start_y; y<end_y; y++){
yading@10: //        DWTELEM * line = slice_buffer_get_line_from_address(sb, src + (y * stride));
yading@10:         IDWTELEM * line = slice_buffer_get_line(sb, (y * b->stride_line) + b->buf_y_offset) + b->buf_x_offset;
yading@10:         for(x=0; x<w; x++){
yading@10:             int i= line[x];
yading@10:             if(i<0){
yading@10:                 line[x]= -((-i*qmul + qadd)>>(QEXPSHIFT)); //FIXME try different bias
yading@10:             }else if(i>0){
yading@10:                 line[x]=  (( i*qmul + qadd)>>(QEXPSHIFT));
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void correlate_slice_buffered(SnowContext *s, slice_buffer * sb, SubBand *b, IDWTELEM *src, int stride, int inverse, int use_median, int start_y, int end_y){
yading@10:     const int w= b->width;
yading@10:     int x,y;
yading@10: 
yading@10:     IDWTELEM * line=0; // silence silly "could be used without having been initialized" warning
yading@10:     IDWTELEM * prev;
yading@10: 
yading@10:     if (start_y != 0)
yading@10:         line = slice_buffer_get_line(sb, ((start_y - 1) * b->stride_line) + b->buf_y_offset) + b->buf_x_offset;
yading@10: 
yading@10:     for(y=start_y; y<end_y; y++){
yading@10:         prev = line;
yading@10: //        line = slice_buffer_get_line_from_address(sb, src + (y * stride));
yading@10:         line = slice_buffer_get_line(sb, (y * b->stride_line) + b->buf_y_offset) + b->buf_x_offset;
yading@10:         for(x=0; x<w; x++){
yading@10:             if(x){
yading@10:                 if(use_median){
yading@10:                     if(y && x+1<w) line[x] += mid_pred(line[x - 1], prev[x], prev[x + 1]);
yading@10:                     else  line[x] += line[x - 1];
yading@10:                 }else{
yading@10:                     if(y) line[x] += mid_pred(line[x - 1], prev[x], line[x - 1] + prev[x] - prev[x - 1]);
yading@10:                     else  line[x] += line[x - 1];
yading@10:                 }
yading@10:             }else{
yading@10:                 if(y) line[x] += prev[x];
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void decode_qlogs(SnowContext *s){
yading@10:     int plane_index, level, orientation;
yading@10: 
yading@10:     for(plane_index=0; plane_index<3; plane_index++){
yading@10:         for(level=0; level<s->spatial_decomposition_count; level++){
yading@10:             for(orientation=level ? 1:0; orientation<4; orientation++){
yading@10:                 int q;
yading@10:                 if     (plane_index==2) q= s->plane[1].band[level][orientation].qlog;
yading@10:                 else if(orientation==2) q= s->plane[plane_index].band[level][1].qlog;
yading@10:                 else                    q= get_symbol(&s->c, s->header_state, 1);
yading@10:                 s->plane[plane_index].band[level][orientation].qlog= q;
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: #define GET_S(dst, check) \
yading@10:     tmp= get_symbol(&s->c, s->header_state, 0);\
yading@10:     if(!(check)){\
yading@10:         av_log(s->avctx, AV_LOG_ERROR, "Error " #dst " is %d\n", tmp);\
yading@10:         return -1;\
yading@10:     }\
yading@10:     dst= tmp;
yading@10: 
yading@10: static int decode_header(SnowContext *s){
yading@10:     int plane_index, tmp;
yading@10:     uint8_t kstate[32];
yading@10: 
yading@10:     memset(kstate, MID_STATE, sizeof(kstate));
yading@10: 
yading@10:     s->keyframe= get_rac(&s->c, kstate);
yading@10:     if(s->keyframe || s->always_reset){
yading@10:         ff_snow_reset_contexts(s);
yading@10:         s->spatial_decomposition_type=
yading@10:         s->qlog=
yading@10:         s->qbias=
yading@10:         s->mv_scale=
yading@10:         s->block_max_depth= 0;
yading@10:     }
yading@10:     if(s->keyframe){
yading@10:         GET_S(s->version, tmp <= 0U)
yading@10:         s->always_reset= get_rac(&s->c, s->header_state);
yading@10:         s->temporal_decomposition_type= get_symbol(&s->c, s->header_state, 0);
yading@10:         s->temporal_decomposition_count= get_symbol(&s->c, s->header_state, 0);
yading@10:         GET_S(s->spatial_decomposition_count, 0 < tmp && tmp <= MAX_DECOMPOSITIONS)
yading@10:         s->colorspace_type= get_symbol(&s->c, s->header_state, 0);
yading@10:         s->chroma_h_shift= get_symbol(&s->c, s->header_state, 0);
yading@10:         s->chroma_v_shift= get_symbol(&s->c, s->header_state, 0);
yading@10: 
yading@10:         if(s->chroma_h_shift == 1 && s->chroma_v_shift==1){
yading@10:             s->avctx->pix_fmt= AV_PIX_FMT_YUV420P;
yading@10:         }else if(s->chroma_h_shift == 0 && s->chroma_v_shift==0){
yading@10:             s->avctx->pix_fmt= AV_PIX_FMT_YUV444P;
yading@10:         }else if(s->chroma_h_shift == 2 && s->chroma_v_shift==2){
yading@10:             s->avctx->pix_fmt= AV_PIX_FMT_YUV410P;
yading@10:         } else {
yading@10:             av_log(s, AV_LOG_ERROR, "unsupported color subsample mode %d %d\n", s->chroma_h_shift, s->chroma_v_shift);
yading@10:             s->chroma_h_shift = s->chroma_v_shift = 1;
yading@10:             s->avctx->pix_fmt= AV_PIX_FMT_YUV420P;
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10: 
yading@10:         s->spatial_scalability= get_rac(&s->c, s->header_state);
yading@10: //        s->rate_scalability= get_rac(&s->c, s->header_state);
yading@10:         GET_S(s->max_ref_frames, tmp < (unsigned)MAX_REF_FRAMES)
yading@10:         s->max_ref_frames++;
yading@10: 
yading@10:         decode_qlogs(s);
yading@10:     }
yading@10: 
yading@10:     if(!s->keyframe){
yading@10:         if(get_rac(&s->c, s->header_state)){
yading@10:             for(plane_index=0; plane_index<2; plane_index++){
yading@10:                 int htaps, i, sum=0;
yading@10:                 Plane *p= &s->plane[plane_index];
yading@10:                 p->diag_mc= get_rac(&s->c, s->header_state);
yading@10:                 htaps= get_symbol(&s->c, s->header_state, 0)*2 + 2;
yading@10:                 if((unsigned)htaps > HTAPS_MAX || htaps==0)
yading@10:                     return -1;
yading@10:                 p->htaps= htaps;
yading@10:                 for(i= htaps/2; i; i--){
yading@10:                     p->hcoeff[i]= get_symbol(&s->c, s->header_state, 0) * (1-2*(i&1));
yading@10:                     sum += p->hcoeff[i];
yading@10:                 }
yading@10:                 p->hcoeff[0]= 32-sum;
yading@10:             }
yading@10:             s->plane[2].diag_mc= s->plane[1].diag_mc;
yading@10:             s->plane[2].htaps  = s->plane[1].htaps;
yading@10:             memcpy(s->plane[2].hcoeff, s->plane[1].hcoeff, sizeof(s->plane[1].hcoeff));
yading@10:         }
yading@10:         if(get_rac(&s->c, s->header_state)){
yading@10:             GET_S(s->spatial_decomposition_count, 0 < tmp && tmp <= MAX_DECOMPOSITIONS)
yading@10:             decode_qlogs(s);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     s->spatial_decomposition_type+= get_symbol(&s->c, s->header_state, 1);
yading@10:     if(s->spatial_decomposition_type > 1U){
yading@10:         av_log(s->avctx, AV_LOG_ERROR, "spatial_decomposition_type %d not supported\n", s->spatial_decomposition_type);
yading@10:         return -1;
yading@10:     }
yading@10:     if(FFMIN(s->avctx-> width>>s->chroma_h_shift,
yading@10:              s->avctx->height>>s->chroma_v_shift) >> (s->spatial_decomposition_count-1) <= 1){
yading@10:         av_log(s->avctx, AV_LOG_ERROR, "spatial_decomposition_count %d too large for size\n", s->spatial_decomposition_count);
yading@10:         return -1;
yading@10:     }
yading@10: 
yading@10: 
yading@10:     s->qlog           += get_symbol(&s->c, s->header_state, 1);
yading@10:     s->mv_scale       += get_symbol(&s->c, s->header_state, 1);
yading@10:     s->qbias          += get_symbol(&s->c, s->header_state, 1);
yading@10:     s->block_max_depth+= get_symbol(&s->c, s->header_state, 1);
yading@10:     if(s->block_max_depth > 1 || s->block_max_depth < 0){
yading@10:         av_log(s->avctx, AV_LOG_ERROR, "block_max_depth= %d is too large\n", s->block_max_depth);
yading@10:         s->block_max_depth= 0;
yading@10:         return -1;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     int ret;
yading@10: 
yading@10:     if ((ret = ff_snow_common_init(avctx)) < 0) {
yading@10:         ff_snow_common_end(avctx->priv_data);
yading@10:         return ret;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int decode_blocks(SnowContext *s){
yading@10:     int x, y;
yading@10:     int w= s->b_width;
yading@10:     int h= s->b_height;
yading@10:     int res;
yading@10: 
yading@10:     for(y=0; y<h; y++){
yading@10:         for(x=0; x<w; x++){
yading@10:             if ((res = decode_q_branch(s, 0, x, y)) < 0)
yading@10:                 return res;
yading@10:         }
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
yading@10:                         AVPacket *avpkt)
yading@10: {
yading@10:     const uint8_t *buf = avpkt->data;
yading@10:     int buf_size = avpkt->size;
yading@10:     SnowContext *s = avctx->priv_data;
yading@10:     RangeCoder * const c= &s->c;
yading@10:     int bytes_read;
yading@10:     AVFrame *picture = data;
yading@10:     int level, orientation, plane_index;
yading@10:     int res;
yading@10: 
yading@10:     ff_init_range_decoder(c, buf, buf_size);
yading@10:     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);
yading@10: 
yading@10:     s->current_picture.pict_type= AV_PICTURE_TYPE_I; //FIXME I vs. P
yading@10:     if(decode_header(s)<0)
yading@10:         return -1;
yading@10:     if ((res=ff_snow_common_init_after_header(avctx)) < 0)
yading@10:         return res;
yading@10: 
yading@10:     // realloc slice buffer for the case that spatial_decomposition_count changed
yading@10:     ff_slice_buffer_destroy(&s->sb);
yading@10:     if ((res = ff_slice_buffer_init(&s->sb, s->plane[0].height,
yading@10:                                     (MB_SIZE >> s->block_max_depth) +
yading@10:                                     s->spatial_decomposition_count * 11 + 1,
yading@10:                                     s->plane[0].width,
yading@10:                                     s->spatial_idwt_buffer)) < 0)
yading@10:         return res;
yading@10: 
yading@10:     for(plane_index=0; plane_index<3; plane_index++){
yading@10:         Plane *p= &s->plane[plane_index];
yading@10:         p->fast_mc= p->diag_mc && p->htaps==6 && p->hcoeff[0]==40
yading@10:                                               && p->hcoeff[1]==-10
yading@10:                                               && p->hcoeff[2]==2;
yading@10:     }
yading@10: 
yading@10:     ff_snow_alloc_blocks(s);
yading@10: 
yading@10:     if(ff_snow_frame_start(s) < 0)
yading@10:         return -1;
yading@10:     //keyframe flag duplication mess FIXME
yading@10:     if(avctx->debug&FF_DEBUG_PICT_INFO)
yading@10:         av_log(avctx, AV_LOG_ERROR, "keyframe:%d qlog:%d\n", s->keyframe, s->qlog);
yading@10: 
yading@10:     if ((res = decode_blocks(s)) < 0)
yading@10:         return res;
yading@10: 
yading@10:     for(plane_index=0; plane_index<3; plane_index++){
yading@10:         Plane *p= &s->plane[plane_index];
yading@10:         int w= p->width;
yading@10:         int h= p->height;
yading@10:         int x, y;
yading@10:         int decode_state[MAX_DECOMPOSITIONS][4][1]; /* Stored state info for unpack_coeffs. 1 variable per instance. */
yading@10: 
yading@10:         if(s->avctx->debug&2048){
yading@10:             memset(s->spatial_dwt_buffer, 0, sizeof(DWTELEM)*w*h);
yading@10:             predict_plane(s, s->spatial_idwt_buffer, plane_index, 1);
yading@10: 
yading@10:             for(y=0; y<h; y++){
yading@10:                 for(x=0; x<w; x++){
yading@10:                     int v= s->current_picture.data[plane_index][y*s->current_picture.linesize[plane_index] + x];
yading@10:                     s->mconly_picture.data[plane_index][y*s->mconly_picture.linesize[plane_index] + x]= v;
yading@10:                 }
yading@10:             }
yading@10:         }
yading@10: 
yading@10:         {
yading@10:         for(level=0; level<s->spatial_decomposition_count; level++){
yading@10:             for(orientation=level ? 1 : 0; orientation<4; orientation++){
yading@10:                 SubBand *b= &p->band[level][orientation];
yading@10:                 unpack_coeffs(s, b, b->parent, orientation);
yading@10:             }
yading@10:         }
yading@10:         }
yading@10: 
yading@10:         {
yading@10:         const int mb_h= s->b_height << s->block_max_depth;
yading@10:         const int block_size = MB_SIZE >> s->block_max_depth;
yading@10:         const int block_h    = plane_index ? block_size>>s->chroma_v_shift : block_size;
yading@10:         int mb_y;
yading@10:         DWTCompose cs[MAX_DECOMPOSITIONS];
yading@10:         int yd=0, yq=0;
yading@10:         int y;
yading@10:         int end_y;
yading@10: 
yading@10:         ff_spatial_idwt_buffered_init(cs, &s->sb, w, h, 1, s->spatial_decomposition_type, s->spatial_decomposition_count);
yading@10:         for(mb_y=0; mb_y<=mb_h; mb_y++){
yading@10: 
yading@10:             int slice_starty = block_h*mb_y;
yading@10:             int slice_h = block_h*(mb_y+1);
yading@10: 
yading@10:             if (!(s->keyframe || s->avctx->debug&512)){
yading@10:                 slice_starty = FFMAX(0, slice_starty - (block_h >> 1));
yading@10:                 slice_h -= (block_h >> 1);
yading@10:             }
yading@10: 
yading@10:             for(level=0; level<s->spatial_decomposition_count; level++){
yading@10:                 for(orientation=level ? 1 : 0; orientation<4; orientation++){
yading@10:                     SubBand *b= &p->band[level][orientation];
yading@10:                     int start_y;
yading@10:                     int end_y;
yading@10:                     int our_mb_start = mb_y;
yading@10:                     int our_mb_end = (mb_y + 1);
yading@10:                     const int extra= 3;
yading@10:                     start_y = (mb_y ? ((block_h * our_mb_start) >> (s->spatial_decomposition_count - level)) + s->spatial_decomposition_count - level + extra: 0);
yading@10:                     end_y = (((block_h * our_mb_end) >> (s->spatial_decomposition_count - level)) + s->spatial_decomposition_count - level + extra);
yading@10:                     if (!(s->keyframe || s->avctx->debug&512)){
yading@10:                         start_y = FFMAX(0, start_y - (block_h >> (1+s->spatial_decomposition_count - level)));
yading@10:                         end_y = FFMAX(0, end_y - (block_h >> (1+s->spatial_decomposition_count - level)));
yading@10:                     }
yading@10:                     start_y = FFMIN(b->height, start_y);
yading@10:                     end_y = FFMIN(b->height, end_y);
yading@10: 
yading@10:                     if (start_y != end_y){
yading@10:                         if (orientation == 0){
yading@10:                             SubBand * correlate_band = &p->band[0][0];
yading@10:                             int correlate_end_y = FFMIN(b->height, end_y + 1);
yading@10:                             int correlate_start_y = FFMIN(b->height, (start_y ? start_y + 1 : 0));
yading@10:                             decode_subband_slice_buffered(s, correlate_band, &s->sb, correlate_start_y, correlate_end_y, decode_state[0][0]);
yading@10:                             correlate_slice_buffered(s, &s->sb, correlate_band, correlate_band->ibuf, correlate_band->stride, 1, 0, correlate_start_y, correlate_end_y);
yading@10:                             dequantize_slice_buffered(s, &s->sb, correlate_band, correlate_band->ibuf, correlate_band->stride, start_y, end_y);
yading@10:                         }
yading@10:                         else
yading@10:                             decode_subband_slice_buffered(s, b, &s->sb, start_y, end_y, decode_state[level][orientation]);
yading@10:                     }
yading@10:                 }
yading@10:             }
yading@10: 
yading@10:             for(; yd<slice_h; yd+=4){
yading@10:                 ff_spatial_idwt_buffered_slice(&s->dwt, cs, &s->sb, s->temp_idwt_buffer, w, h, 1, s->spatial_decomposition_type, s->spatial_decomposition_count, yd);
yading@10:             }
yading@10: 
yading@10:             if(s->qlog == LOSSLESS_QLOG){
yading@10:                 for(; yq<slice_h && yq<h; yq++){
yading@10:                     IDWTELEM * line = slice_buffer_get_line(&s->sb, yq);
yading@10:                     for(x=0; x<w; x++){
yading@10:                         line[x] <<= FRAC_BITS;
yading@10:                     }
yading@10:                 }
yading@10:             }
yading@10: 
yading@10:             predict_slice_buffered(s, &s->sb, s->spatial_idwt_buffer, plane_index, 1, mb_y);
yading@10: 
yading@10:             y = FFMIN(p->height, slice_starty);
yading@10:             end_y = FFMIN(p->height, slice_h);
yading@10:             while(y < end_y)
yading@10:                 ff_slice_buffer_release(&s->sb, y++);
yading@10:         }
yading@10: 
yading@10:         ff_slice_buffer_flush(&s->sb);
yading@10:         }
yading@10: 
yading@10:     }
yading@10: 
yading@10:     emms_c();
yading@10: 
yading@10:     ff_snow_release_buffer(avctx);
yading@10: 
yading@10:     if(!(s->avctx->debug&2048))
yading@10:         av_frame_ref(picture, &s->current_picture);
yading@10:     else
yading@10:         av_frame_ref(picture, &s->mconly_picture);
yading@10: 
yading@10:     *got_frame = 1;
yading@10: 
yading@10:     bytes_read= c->bytestream - c->bytestream_start;
yading@10:     if(bytes_read ==0) av_log(s->avctx, AV_LOG_ERROR, "error at end of frame\n"); //FIXME
yading@10: 
yading@10:     return bytes_read;
yading@10: }
yading@10: 
yading@10: static av_cold int decode_end(AVCodecContext *avctx)
yading@10: {
yading@10:     SnowContext *s = avctx->priv_data;
yading@10: 
yading@10:     ff_slice_buffer_destroy(&s->sb);
yading@10: 
yading@10:     ff_snow_common_end(s);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: AVCodec ff_snow_decoder = {
yading@10:     .name           = "snow",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_SNOW,
yading@10:     .priv_data_size = sizeof(SnowContext),
yading@10:     .init           = decode_init,
yading@10:     .close          = decode_end,
yading@10:     .decode         = decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Snow"),
yading@10: };