/[amv]/amv.pl
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Contents of /amv.pl

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Revision 7 - (show annotations)
Thu Jul 19 21:16:30 2007 UTC (11 years, 9 months ago) by dpavlin
File MIME type: text/plain
File size: 3058 byte(s)
added reference links on the web
1 #!/usr/bin/perl -w
2
3 # amv.pl
4 #
5 # 07/19/07 19:21:39 CEST Dobrica Pavlinusic <dpavlin@rot13.org>
6 #
7 # Various useful links used to produce this:
8 # http://www.moviecodec.com/topics/15431p1.html
9 # http://en.wikipedia.org/wiki/RIFF_(File_format)
10
11 use strict;
12
13 use Data::Dump qw/dump/;
14 use Carp qw/confess/;
15
16 my $path = shift @ARGV || die "usage: $0 movie.amv\n";
17
18 open(my $fh, '<', $path) || die "can't open $path: $!";
19
20 # offset in file
21 my $o = 0;
22
23 # shared data hash
24 my $d;
25
26 sub hex_dump {
27 my $bytes = shift || return;
28
29 my $ascii = $bytes;
30 $ascii =~ s/\W/./gs;
31 my $hex = unpack('h*', $bytes);
32 $hex =~ s/(..)/$1 /g;
33 # calculate number of characters for offset
34 #my $d = length( sprintf("%x",length($bytes)) );
35 my $d = 4;
36 my $prefix = '#.';
37 while ( $hex =~ s/^((?:\w\w\s){1,16})// ) {
38 printf "$prefix %0${d}x | %-48s| %s\n", $o, $1, substr( $ascii, 0, 16 );
39 $prefix = '##';
40 if ( length($ascii) >= 16 ) {
41 $ascii = substr( $ascii, 16 );
42 $o += 16;
43 } else {
44 $o += length($ascii);
45 last;
46 }
47 }
48 }
49
50 sub x {
51 my ($len,$format) = @_;
52
53 my $bytes;
54 read($fh, $bytes, $len);
55
56 my $r_len = length($bytes);
57 confess "read $r_len bytes, expected $len" if $len != $r_len;
58
59 hex_dump( $bytes );
60
61 if ( $bytes eq 'AMV_END_' ) {
62 warn "> end of file marker AMV_END_\n";
63 $d->{eof}++;
64 return;
65 }
66
67 if ( $format ) {
68 my @data = unpack($format, $bytes);
69 warn "## unpacked = ",dump(@data),"\n";
70 return @data;
71 } else {
72 return $bytes;
73 }
74 }
75
76 sub next_part {
77 my ( $expected_part, $expected_len, $skip ) = @_;
78 my ( $part, $len ) = x(8,'A4V');
79 return unless $len;
80 confess "not $expected_part but $part" if $expected_part ne $part;
81 if ( $expected_len ) {
82 confess "expected $expected_len bytes for $part got $len" if $len != $expected_len;
83 }
84 printf ">> %s - %d 0x%x bytes\n", $part, $len, $len;
85 x($len) if $skip;
86 return $len;
87 }
88
89 my ( $riff, $amv ) = x(12, 'Z8Z4');
90 die "not RIFF but $riff" if $riff ne 'RIFF';
91 die "not AMV but $amv" if $amv ne 'AMV ';
92
93 while ( ! defined($d->{eof}) ) {
94 my ( $list, $name ) = x(12,'A4x4A4');
95 die "not LIST but $list" if $list ne 'LIST';
96 print "> $list .. $name\n";
97
98 if ( $name eq 'hdrl' ) {
99
100 my $len = next_part( 'amvh', hex(38) );
101
102 my @names = ( qw/ms_per_frame width height fps ss mm hh/ );
103 my $h;
104 map {
105 my $v = $_;
106 my $n = shift @names || die "no more names?";
107 $h->{$n} = $v;
108 } x($len, 'Vx28VVVx8CCv');
109
110 printf "## %s %d*%d %s fps (%d ms/frame) %02d:%02d:%02d\n",
111 $h->{path},
112 $h->{width}, $h->{height}, $h->{fps}, $h->{ms_per_frame},
113 $h->{hh}, $h->{mm}, $h->{ss};
114
115 $d->{amvh} = $h;
116
117 } elsif ( $name eq 'strl' ) {
118
119 next_part( 'strh', 0, 1 );
120 next_part( 'strf', 0, 1 );
121
122 } elsif ( $name eq 'movi' ) {
123
124 while (1) {
125 my $frame = $d->{movi}++;
126
127 my $len = next_part( '00dc', 0, 1 );
128 last unless $len;
129 printf ">> %s 00dc - frame %d jpeg %d 0x%x bytes\n", $name, $frame, $len, $len;
130
131 my $len = next_part( '01wb', 0, 1 );
132 printf ">> %s 01wb - frame %d audio %d 0x%x bytes\n", $name, $frame, $len, $len;
133 };
134
135 } else {
136 die "unknown $list $name";
137 }
138 }

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