/[amv]/amv.pl
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Annotation of /amv.pl

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Revision 4 - (hide annotations)
Thu Jul 19 20:49:06 2007 UTC (11 years, 9 months ago) by dpavlin
File MIME type: text/plain
File size: 2872 byte(s)
correctly dump whole amv file structure
1 dpavlin 3 #!/usr/bin/perl -w
2    
3     # amv.pl
4     #
5     # 07/19/07 19:21:39 CEST Dobrica Pavlinusic <dpavlin@rot13.org>
6    
7     use strict;
8    
9     use Data::Dump qw/dump/;
10     use Carp qw/confess/;
11    
12     my $path = shift @ARGV || die "usage: $0 movie.amv\n";
13    
14     open(my $fh, '<', $path) || die "can't open $path: $!";
15    
16 dpavlin 4 # offset in file
17     my $o = 0;
18    
19     # shared data hash
20     my $d;
21    
22 dpavlin 3 sub hex_dump {
23     my $bytes = shift || return;
24    
25     my $ascii = $bytes;
26     $ascii =~ s/\W/./gs;
27     my $hex = unpack('h*', $bytes);
28     $hex =~ s/(..)/$1 /g;
29     # calculate number of characters for offset
30 dpavlin 4 #my $d = length( sprintf("%x",length($bytes)) );
31     my $d = 4;
32 dpavlin 3 while ( $hex =~ s/^((?:\w\w\s){1,16})// ) {
33     printf "## %0${d}x | %-48s| %s\n", $o, $1, substr( $ascii, 0, 16 );
34     if ( length($ascii) >= 16 ) {
35     $ascii = substr( $ascii, 16 );
36 dpavlin 4 $o += 16;
37 dpavlin 3 } else {
38 dpavlin 4 $o += length($ascii);
39 dpavlin 3 last;
40     }
41     }
42     }
43    
44     sub x {
45     my ($len,$format) = @_;
46    
47     my $bytes;
48     read($fh, $bytes, $len);
49    
50     my $r_len = length($bytes);
51     confess "read $r_len bytes, expected $len" if $len != $r_len;
52    
53     hex_dump( $bytes );
54    
55 dpavlin 4 if ( $bytes eq 'AMV_END_' ) {
56     warn "## end of file marker AMV_END_\n";
57     $d->{eof}++;
58     return;
59     }
60    
61 dpavlin 3 if ( $format ) {
62     my @data = unpack($format, $bytes);
63 dpavlin 4 warn "## unpacked = ",dump(@data),"\n";
64 dpavlin 3 return @data;
65     } else {
66     return $bytes;
67     }
68     }
69    
70     sub next_part {
71     my ( $expected_part, $expected_len, $skip ) = @_;
72     my ( $part, $len ) = x(8,'A4V');
73 dpavlin 4 return unless $len;
74 dpavlin 3 confess "not $expected_part but $part" if $expected_part ne $part;
75     if ( $expected_len ) {
76     confess "expected $expected_len bytes for $part got $len" if $len != $expected_len;
77     }
78 dpavlin 4 printf ">>> %s | %d 0x%x bytes\n", $part, $len, $len;
79 dpavlin 3 x($len) if $skip;
80     return $len;
81     }
82    
83     my ( $riff, $amv ) = x(12, 'Z8Z4');
84     die "not RIFF but $riff" if $riff ne 'RIFF';
85     die "not AMV but $amv" if $amv ne 'AMV ';
86    
87 dpavlin 4 while ( ! defined($d->{eof}) ) {
88 dpavlin 3 my ( $list, $name ) = x(12,'A4x4A4');
89     die "not LIST but $list" if $list ne 'LIST';
90     print "> $list .. $name\n";
91    
92     if ( $name eq 'hdrl' ) {
93    
94     my $len = next_part( 'amvh', hex(38) );
95    
96     my @names = ( qw/ms_per_frame width height fps ss mm hh/ );
97     my $h;
98     map {
99     my $v = $_;
100     my $n = shift @names || die "no more names?";
101     $h->{$n} = $v;
102     } x($len, 'Vx28VVVx8CCv');
103    
104     printf "## %s %d*%d %s fps (%d ms/frame) %02d:%02d:%02d\n",
105     $h->{path},
106     $h->{width}, $h->{height}, $h->{fps}, $h->{ms_per_frame},
107     $h->{hh}, $h->{mm}, $h->{ss};
108    
109     $d->{amvh} = $h;
110    
111     } elsif ( $name eq 'strl' ) {
112    
113     next_part( 'strh', 0, 1 );
114     next_part( 'strf', 0, 1 );
115    
116 dpavlin 4 } elsif ( $name eq 'movi' ) {
117    
118     while (1) {
119     my $frame = $d->{movi}++;
120    
121     my $len = next_part( '00dc', 0, 1 );
122     last unless $len;
123     printf ">> %s 00dc - frame %d jpeg %d 0x%x bytes\n", $name, $frame, $len, $len;
124    
125     my $len = next_part( '01wb', 0, 1 );
126     printf ">> %s 01wb - frame %d audio %d 0x%x bytes\n", $name, $frame, $len, $len;
127     };
128    
129 dpavlin 3 } else {
130     die "unknown $list $name";
131     }
132     }

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