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#!/usr/bin/perl -w |
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|
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# amv.pl |
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# |
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# 07/19/07 19:21:39 CEST Dobrica Pavlinusic <dpavlin@rot13.org> |
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# |
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# Various useful links used to produce this: |
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# http://www.moviecodec.com/topics/15431p1.html |
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# http://en.wikipedia.org/wiki/RIFF_(File_format) |
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|
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use strict; |
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|
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use Data::Dump qw/dump/; |
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use Carp qw/confess/; |
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|
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my $path = shift @ARGV || die "usage: $0 movie.amv\n"; |
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|
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open(my $fh, '<', $path) || die "can't open $path: $!"; |
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|
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# offset in file |
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my $o = 0; |
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|
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# shared data hash |
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my $d; |
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|
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sub hex_dump { |
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my $bytes = shift || return; |
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|
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my $ascii = $bytes; |
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$ascii =~ s/\W/./gs; |
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my $hex = unpack('h*', $bytes); |
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$hex =~ s/(..)/$1 /g; |
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# calculate number of characters for offset |
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#my $d = length( sprintf("%x",length($bytes)) ); |
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my $d = 4; |
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my $prefix = '#.'; |
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while ( $hex =~ s/^((?:\w\w\s){1,16})// ) { |
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printf "$prefix %0${d}x | %-48s| %s\n", $o, $1, substr( $ascii, 0, 16 ); |
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$prefix = '##'; |
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if ( length($ascii) >= 16 ) { |
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$ascii = substr( $ascii, 16 ); |
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$o += 16; |
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} else { |
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$o += length($ascii); |
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last; |
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} |
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} |
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} |
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|
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sub x { |
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my ($len,$format) = @_; |
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|
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my $bytes; |
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read($fh, $bytes, $len); |
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|
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my $r_len = length($bytes); |
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confess "read $r_len bytes, expected $len" if $len != $r_len; |
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|
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hex_dump( $bytes ); |
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|
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if ( $bytes eq 'AMV_END_' ) { |
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warn "> end of file marker AMV_END_\n"; |
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$d->{eof}++; |
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return; |
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} |
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|
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if ( $format ) { |
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my @data = unpack($format, $bytes); |
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warn "## unpacked = ",dump(@data),"\n"; |
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return @data; |
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} else { |
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return $bytes; |
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} |
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} |
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|
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sub next_part { |
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my ( $expected_part, $expected_len, $skip ) = @_; |
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my ( $part, $len ) = x(8,'A4V'); |
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return unless $len; |
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confess "not $expected_part but $part" if $expected_part ne $part; |
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if ( $expected_len ) { |
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confess "expected $expected_len bytes for $part got $len" if $len != $expected_len; |
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} |
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printf ">> %s - %d 0x%x bytes\n", $part, $len, $len; |
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x($len) if $skip; |
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return $len; |
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} |
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|
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my ( $riff, $amv ) = x(12, 'Z8Z4'); |
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die "not RIFF but $riff" if $riff ne 'RIFF'; |
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die "not AMV but $amv" if $amv ne 'AMV '; |
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|
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while ( ! defined($d->{eof}) ) { |
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my ( $list, $name ) = x(12,'A4x4A4'); |
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die "not LIST but $list" if $list ne 'LIST'; |
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print "> $list .. $name\n"; |
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|
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if ( $name eq 'hdrl' ) { |
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|
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my $len = next_part( 'amvh', hex(38) ); |
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|
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my @names = ( qw/ms_per_frame width height fps ss mm hh/ ); |
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my $h; |
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map { |
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my $v = $_; |
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my $n = shift @names || die "no more names?"; |
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$h->{$n} = $v; |
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} x($len, 'Vx28VVVx8CCv'); |
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|
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printf "## %s %d*%d %s fps (%d ms/frame) %02d:%02d:%02d\n", |
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$h->{path}, |
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$h->{width}, $h->{height}, $h->{fps}, $h->{ms_per_frame}, |
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$h->{hh}, $h->{mm}, $h->{ss}; |
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|
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$d->{amvh} = $h; |
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|
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} elsif ( $name eq 'strl' ) { |
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|
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next_part( 'strh', 0, 1 ); |
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next_part( 'strf', 0, 1 ); |
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|
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} elsif ( $name eq 'movi' ) { |
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|
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while (1) { |
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my $frame = $d->{movi}++; |
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|
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my $len = next_part( '00dc', 0, 1 ); |
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last unless $len; |
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printf ">> %s 00dc - frame %d jpeg %d 0x%x bytes\n", $name, $frame, $len, $len; |
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|
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my $len = next_part( '01wb', 0, 1 ); |
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printf ">> %s 01wb - frame %d audio %d 0x%x bytes\n", $name, $frame, $len, $len; |
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}; |
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|
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} else { |
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die "unknown $list $name"; |
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} |
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} |
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