static void decode_p_block(FourXContext *f, uint16_t *dst, uint16_t *src, int log2w, int log2h, int stride){ const int index= size2index[log2h][log2w]; const int h= 1<<log2h; int code= get_vlc2(&f->gb, block_type_vlc[1-(f->version>1)][index].table, BLOCK_TYPE_VLC_BITS, 1); uint16_t *start= (uint16_t*)f->last_picture.data[0]; uint16_t *end= start + stride*(f->avctx->height-h+1) - (1<<log2w); assert(code>=0 && code<=6); if(code == 0){ src += f->mv[ *f->bytestream++ ]; if(start > src || src > end){ av_log(f->avctx, AV_LOG_ERROR, "mv out of pic\n"); return; } mcdc(dst, src, log2w, h, stride, 1, 0); }else if(code == 1){ log2h--; decode_p_block(f, dst , src , log2w, log2h, stride); decode_p_block(f, dst + (stride<<log2h), src + (stride<<log2h), log2w, log2h, stride); }else if(code == 2){ log2w--; decode_p_block(f, dst , src , log2w, log2h, stride); decode_p_block(f, dst + (1<<log2w), src + (1<<log2w), log2w, log2h, stride); }else if(code == 3 && f->version<2){ mcdc(dst, src, log2w, h, stride, 1, 0); }else if(code == 4){ src += f->mv[ *f->bytestream++ ]; if(start > src || src > end){ av_log(f->avctx, AV_LOG_ERROR, "mv out of pic\n"); return; } mcdc(dst, src, log2w, h, stride, 1, av_le2ne16(*f->wordstream++)); }else if(code == 5){ mcdc(dst, src, log2w, h, stride, 0, av_le2ne16(*f->wordstream++)); }else if(code == 6){ if(log2w){ dst[0] = av_le2ne16(*f->wordstream++); dst[1] = av_le2ne16(*f->wordstream++); }else{ dst[0 ] = av_le2ne16(*f->wordstream++); dst[stride] = av_le2ne16(*f->wordstream++); } } }