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#
# Copyright (c) 1993 The Regents of the University of California.
# All rights reserved.
#
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose, without fee, and without written agreement is
# hereby granted, provided that the above copyright notice and the following
# two paragraphs appear in all copies of this software.
#
# IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
# DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
# OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
# CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
# INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
# ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
# PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
#
#
# $Header: /n/picasso/users/dwallach/vid2/mpeg_encode/RCS/parse_huff.pl,v 1.3 1993/01/18 10:56:03 dwallach Exp $
# $Log: parse_huff.pl,v $
# Revision 1.3 1993/01/18 10:56:03 dwallach
# got RCS headers in huff.c and huff.h working
#
# Revision 1.3 1993/01/18 10:56:03 dwallach
# got RCS headers in huff.c and huff.h working
#
# Revision 1.2 1993/01/18 10:17:29 dwallach
# RCS headers installed, code indented uniformly
#
# Revision 1.2 1993/01/18 10:17:29 dwallach
# RCS headers installed, code indented uniformly
#
#
# this program's purpose in life is to parse the Huffman tables
# and output C code which is awfully useful for translation
# typical usage:
# perl parse_huff.pl huffman.table
# ---> generates huff.c and huff.h
# source format: # is a comment character
# Otherwise, there are three tab-separated fields in a line:
# Run, Level, and VLC Code
# Run and Level are integers, corresponding to the RLE coding.
# The VLC code is what bits to generate, and is expected to be
# composed of 1, 0, space, and 's'. Spaces are ignored, and
# s corresponds to the sign bit. In the output of this program,
# We'll completely right-shift the data, with a 0 for the sign
# bit. The encoder will make appropriate changes before outputing.
open(HUFFC, "> huff.c") || die "Can't write huff.c: $!\n";
open(HUFFH, "> huff.h") || die "Can't write huff.h: $!\n";
sub encode {
local($run, $level, $vlc) = @_;
local($result) = 0;
local($tmp);
$vlc =~ s/\s//g; # remove whitespace
local($bits) = length($vlc);
foreach (split(//, $vlc)) {
$_ = 0 if $_ eq 's';
$result = ($result << 1) + $_;
}
$tmp = sprintf("0x%x", $result);
eval "\$vlc$run[$level] = \$tmp";
eval "\$bits$run[$level] = \$bits";
}
while(<>) {
chop;
s/\s*#.*$//; # remove comments
next if /^\s*$/; # continue if the line is purely whitespace
($run, $level, $vlc) = split(/\t/);
&encode($run, $level, $vlc);
#
# we have the +1's to insure the sizes of C arrays are correct
#
$maxlevel[$run] = $level+1 if $level >= $maxlevel[$run];
$maxlevel = $level+1 if $level >= $maxlevel;
$maxrun = $run+1 if $run >= $maxrun;
}
#
# fix the entries that aren't defined
#
for($run = 0; $run < $maxrun; $run++) {
eval "\$vlc$run[0] = '0x0' if \$vlc$run[0] eq ''";
eval "\$bits$run[0] = '0' if \$bits$run[0] eq ''";
}
#
# now, output some C code
#
printf HUFFC <<'EOF', $maxrun, join(", ", @maxlevel);
/*
* Copyright (c) 1993 The Regents of the University of California.
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose, without fee, and without written agreement is
* hereby granted, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
* CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
/*
* $Header: /n/picasso/users/dwallach/vid2/mpeg_encode/RCS/parse_huff.pl,v 1.3 1993/01/18 10:56:03 dwallach Exp $
*/
/*
* THIS FILE IS MACHINE GENERATED! DO NOT EDIT!
*/
#include "mtypes.h"
#include "huff.h"
int huff_maxlevel[%s] = { %s };
EOF
for($run = 0; $run < $maxrun; $run++) {
printf HUFFC <<EOF, eval "join(', ', \@vlc$run)", eval "join(', ', \@bits$run)";
uint32 huff_table$run[$maxlevel[$run]] = { %s };
int huff_bits$run[$maxlevel[$run]] = { %s };
EOF
}
printf HUFFC "uint32 *huff_table[$maxrun] = { ";
for($run = 0; $run < $maxrun; $run++) {
printf HUFFC "%shuff_table$run", ($run)?", ":"";
}
printf HUFFC " };\n";
printf HUFFC "int *huff_bits[$maxrun] = { ";
for($run = 0; $run < $maxrun; $run++) {
printf HUFFC "%shuff_bits$run", ($run)?", ":"";
}
printf HUFFC " };\n";
close HUFFC;
printf HUFFH <<'EOF', $maxrun, $maxlevel;
/*
* Copyright (c) 1993 The Regents of the University of California.
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose, without fee, and without written agreement is
* hereby granted, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
* CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
/*
* $Header: /n/picasso/users/dwallach/vid2/mpeg_encode/RCS/parse_huff.pl,v 1.3 1993/01/18 10:56:03 dwallach Exp $
*/
/*
* THIS FILE IS MACHINE GENERATED! DO NOT EDIT!
*/
#define HUFF_MAXRUN %s
#define HUFF_MAXLEVEL %s
extern int huff_maxlevel[];
extern uint32 *huff_table[];
extern int *huff_bits[];
EOF
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