📄 wvtpezw_tree_init_decode.cpp
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/****************************************************************************/
/* MPEG4 Visual Texture Coding (VTC) Mode Software */
/* */
/* This software was jointly developed by the following participants: */
/* */
/* Single-quant, multi-quant and flow control */
/* are provided by Sarnoff Corporation */
/* Iraj Sodagar (iraj@sarnoff.com) */
/* Hung-Ju Lee (hjlee@sarnoff.com) */
/* Paul Hatrack (hatrack@sarnoff.com) */
/* Shipeng Li (shipeng@sarnoff.com) */
/* Bing-Bing Chai (bchai@sarnoff.com) */
/* B.S. Srinivas (bsrinivas@sarnoff.com) */
/* */
/* Bi-level is provided by Texas Instruments */
/* Jie Liang (liang@ti.com) */
/* */
/* Shape Coding is provided by OKI Electric Industry Co., Ltd. */
/* Zhixiong Wu (sgo@hlabs.oki.co.jp) */
/* Yoshihiro Ueda (yueda@hlabs.oki.co.jp) */
/* Toshifumi Kanamaru (kanamaru@hlabs.oki.co.jp) */
/* */
/* OKI, Sharp, Sarnoff, TI and Microsoft contributed to bitstream */
/* exchange and bug fixing. */
/* */
/* */
/* In the course of development of the MPEG-4 standard, this software */
/* module is an implementation of a part of one or more MPEG-4 tools as */
/* specified by the MPEG-4 standard. */
/* */
/* The copyright of this software belongs to ISO/IEC. ISO/IEC gives use */
/* of the MPEG-4 standard free license to use this software module or */
/* modifications thereof for hardware or software products claiming */
/* conformance to the MPEG-4 standard. */
/* */
/* Those intending to use this software module in hardware or software */
/* products are advised that use may infringe existing patents. The */
/* original developers of this software module and their companies, the */
/* subsequent editors and their companies, and ISO/IEC have no liability */
/* and ISO/IEC have no liability for use of this software module or */
/* modification thereof in an implementation. */
/* */
/* Permission is granted to MPEG members to use, copy, modify, */
/* and distribute the software modules ( or portions thereof ) */
/* for standardization activity within ISO/IEC JTC1/SC29/WG11. */
/* */
/* Copyright 1995, 1996, 1997, 1998 ISO/IEC */
/****************************************************************************/
/****************************************************************************/
/* Texas Instruments Predictive Embedded Zerotree (PEZW) Image Codec */
/* Developed by Jie Liang (liang@ti.com) */
/* */
/* Copyright 1996, 1997, 1998 Texas Instruments */
/****************************************************************************/
/****************************************************************************
File name: wvtpezw_tree_init_decode.c
Author: Jie Liang (liang@ti.com)
Functions: functions for initialization and closing of the
PEZW coder.
Revisions: v1.0 (10/04/98)
*****************************************************************************/
#include <time.h>
#include <stdlib.h>
#include <math.h>
#include "wvtPEZW.hpp"
#include "PEZW_zerotree.hpp"
#include "wvtpezw_tree_codec.hpp"
#include "PEZW_functions.hpp"
/* initialize the global datastructure set up
in wvtpezw_tree_codec.h */
void PEZW_decode_init (Int levels, Int Imgwidth, Int Imgheight)
{
int len;
int i,j;
int x,y;
int adapt=ADAPTATION_MODE;
int contexts;
int pos, bpos;
int hpos_start, hpos_end;
int vpos_start, vpos_end;
int hsize, vsize;
int band;
int npix;
int start,end;
int IsStream=1;
int Mbplane=0;
int NumTree=0;
int nsym, *freq;
#ifdef DEBUG_FILE
fp_debug = fopen("zerotree_debug_decode.txt","w");
if(DEBUG_SYMBOL)
fprintf(fp_debug,"\n\n\n********Decoder*********\n");
#endif
hsize = Imgwidth;
vsize = Imgheight;
/* define the global variables defined in
wvtpezw_tree_codec.h */
tree_depth = levels;
MaxValue=0;
/* positions of each depth within the tree */
len_tree_struct = 0;
level_pos = (short *)calloc(tree_depth,sizeof(short));
level_pos[0]=0;
for (i=1;i<levels;i++){
len_tree_struct += 1<<(2*(i-1));
level_pos[i] = len_tree_struct;
}
len_tree_struct += 1<<(2*(levels-1));
/* mask */
snr_weight = (int *)calloc(tree_depth,sizeof(int));
bitplane = (unsigned char *)calloc(tree_depth,sizeof(char));
/* data structure for the wavelet coefficients */
the_wvt_tree = (WINT *)calloc(len_tree_struct,sizeof(WINT));
abs_wvt_tree = (WINT *)calloc(len_tree_struct,sizeof(WINT));
maskbit=(unsigned int *) calloc(tree_depth,sizeof(int));
sign_bit = (char *) calloc(tree_depth,sizeof(int));
/* data structure for the maximum abs value of the coeffs. */
wvt_tree_maxval = (WINT *)calloc(len_tree_struct - (1<<(2*(levels-1))),
sizeof(WINT));
/* location map for reading wavelet coefficients */
hloc_map=(int *)calloc(len_tree_struct,sizeof(int));
vloc_map=(int *)calloc(len_tree_struct,sizeof(int));
hloc_map[0]=0;
vloc_map[0]=0;
for(i=1;i<tree_depth;i++){
npix=1<<(2*(i-1));
pos=level_pos[i];
start=level_pos[i-1];
end=level_pos[i];
for(j=start;j<end;j++)
{
hpos_start=2*hloc_map[j];
vpos_start=2*vloc_map[j];
hpos_end=hpos_start+2;
vpos_end=vpos_start+2;
for(y=vpos_start;y<vpos_end;y++)
for(x=hpos_start;x<hpos_end;x++){
hloc_map[pos]=x;
vloc_map[pos]=y;
pos++;
}
} /* end of j */
} /* end of i */
/* scan trees */
len=2*(len_tree_struct-(1<<(2*(levels-1))));
ScanTrees = (short *)calloc(len,sizeof(short));
next_ScanTrees = (short *)calloc(len,sizeof(short));
/* significant coefficents */
sig_pos = (short *)calloc(len_tree_struct,sizeof(short));
sig_layer = (char *)calloc(len_tree_struct,sizeof(char));
/* total number of significant coefficients */
num_Sig = 0;
/* sign bit buffer */
sign_bit = (char *)calloc(len_tree_struct,sizeof(char));
/* previous zerotree status */
prev_label = (unsigned char*)calloc(len_tree_struct,sizeof(char));
/* arithmetic encoder structure */
Decoder = (Ac_decoder **)calloc(tree_depth,sizeof(Ac_decoder *));
for(i=0;i<tree_depth;i++)
Decoder[i]=(Ac_decoder *)calloc(Max_Bitplane, sizeof(Ac_decoder));
/* set the bitstream buffer for encoder */
/* arithmetic encoder structure */
Decoder = (Ac_decoder **)calloc(tree_depth,sizeof(Ac_decoder *));
for(i=0;i<tree_depth;i++)
Decoder[i]=(Ac_decoder *)calloc(Max_Bitplane, sizeof(Ac_decoder));
/* context models */
context_model = (Ac_model *)calloc(Max_Bitplane*levels*NumContexts,sizeof(Ac_model));
for(bpos=Max_Bitplane-1;bpos>=0;bpos--)
for(i=0;i<tree_depth;i++)
for(j=0;j<NumContext_per_pixel;j++)
for (band=0;band<NumBands;band++)
{
nsym = 4;
contexts=bpos*tree_depth*NumContexts+i*NumContexts+j*NumBands+band;
if ((i==tree_depth-1)||(j==IZER))
freq = freq_dom2_IZER;
else
freq = freq_dom_ZTRZ;
Ac_model_init (&context_model[contexts], nsym, freq,
Max_frequency_TI, adapt);
}
model_sub = (Ac_model *)calloc(tree_depth*MAX_BITPLANE,sizeof(Ac_model));
model_sign = (Ac_model *)calloc(tree_depth*MAX_BITPLANE,sizeof(Ac_model));
for(i=0;i<tree_depth*MAX_BITPLANE;i++){
Ac_model_init (&model_sub[i],nsym,freq_dom2_IZER, Max_frequency_TI, adapt);
Ac_model_init (&model_sign[i],nsym,freq_dom2_IZER, Max_frequency_TI, adapt);
}
return;
}
/* end of coding processing (for each layer):
flush the arithmetic coder
output the pointer to the bitstream and
the lenght of the bitstream
bitstream and Init_Bufsize are the
return parameters (global variables ) */
void PEZW_decode_done ()
{
Int i,j;
Int bpos, band, contexts;
/* free memory */
free(hloc_map);
free(vloc_map);
free(level_pos);
free(snr_weight);
free(bitplane);
free(the_wvt_tree);
free(sign_bit);
free(ScanTrees);
free(next_ScanTrees);
free(sig_pos);
free(sig_layer);
free(prev_label);
for(i=0;i<tree_depth;i++)
for(bpos=Max_Bitplane-1;bpos>=0;bpos--)
{
bits_to_go_inBuffer[i][bpos] = AC_decoder_buffer_adjust(&Decoder[i][bpos]);
decoded_bytes[i][bpos] = Decoder[i][bpos].stream-PEZW_bitstream[i][bpos];
}
for(i=0;i<tree_depth;i++)
free(Decoder[i]);
free(Decoder);
for(bpos=Max_Bitplane-1;bpos>=0;bpos--)
for(i=0;i<tree_depth;i++)
for(j=0;j<NumContext_per_pixel;j++)
for (band=0;band<NumBands;band++)
{
contexts=bpos*tree_depth*NumContexts+i*NumContexts+j*NumBands+band;
AC_free_model(&context_model[contexts]);
}
for(i=0;i<tree_depth*MAX_BITPLANE;i++){
AC_free_model(&model_sign[i]);
AC_free_model(&model_sub[i]);
}
free(model_sign);
free(model_sub);
free(context_model);
#ifdef DEBUG_FILE
fp_debug = fclose(fp_debug);
#endif
return;
}
void setbuffer_PEZW_decode ()
{
Int bpos, i;
UChar adapt=1;
/* set the bitstream buffer for decoder */
for(bpos=Max_Bitplane-1;bpos>=Min_Bitplane;bpos--)
for (i=0; i<tree_depth-spatial_leveloff; i++){
Ac_decoder_open (&Decoder[i][bpos],PEZW_bitstream[i][bpos],1);
Ac_decoder_init (&Decoder[i][bpos],PEZW_bitstream[i][bpos]);
}
}
void reset_PEZW_decode ()
{
Int bpos;
Int i,j, band;
Int contexts;
Int nsym;
Int adapt=1;
int *freq;
unsigned char *spbuffer;
/* AC context models */
for(bpos=Max_Bitplane-1;bpos>=0;bpos--)
for(i=0;i<tree_depth;i++)
for(j=0;j<NumContext_per_pixel;j++)
for (band=0;band<NumBands;band++)
{
nsym = 4;
contexts=bpos*tree_depth*NumContexts+i*NumContexts+j*NumBands+band;
if ((i==tree_depth-1)||(j==IZER))
freq = freq_dom2_IZER;
else
freq = freq_dom_ZTRZ;
AC_free_model(&context_model[contexts]);
Ac_model_init (&context_model[contexts], nsym, freq,
Max_frequency_TI, adapt);
}
for(i=0;i<tree_depth*MAX_BITPLANE;i++){
AC_free_model(&model_sub[i]);
AC_free_model(&model_sign[i]);
Ac_model_init (&model_sub[i],nsym,freq_dom2_IZER, Max_frequency_TI, adapt);
Ac_model_init (&model_sign[i],nsym,freq_dom2_IZER, Max_frequency_TI, adapt);
}
/* reset AC decoder buffer */
for(bpos=Max_Bitplane-1;bpos>=0;bpos--)
for(i=0;i<tree_depth;i++)
{
/* adjust buffer position */
AC_decoder_buffer_adjust(&Decoder[i][bpos]);
spbuffer = Decoder[i][bpos].stream;
/* initizlize AC coder */
Ac_decoder_open (&Decoder[i][bpos],spbuffer,1);
Ac_decoder_init (&Decoder[i][bpos],spbuffer);
}
return;
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