--- amv.pl	2007/07/19 20:53:33	5
+++ amv.pl	2007/07/20 16:07:46	11
@@ -3,14 +3,28 @@
 # amv.pl
 #
 # 07/19/07 19:21:39 CEST Dobrica Pavlinusic <dpavlin@rot13.org>
+#
+# Various useful links used to produce this:
+# http://www.moviecodec.com/topics/15431p1.html
+# http://en.wikipedia.org/wiki/RIFF_(File_format)
+# http://www.obrador.com/essentialjpeg/HeaderInfo.htm
+# http://lists.helixcommunity.org/pipermail/datatype-dev/2005-January/001886.html
 
 use strict;
 
 use Data::Dump qw/dump/;
 use Carp qw/confess/;
+use File::Path;
+
+my $dump = 0;
+my $debug = 0;
 
 my $path = shift @ARGV || die "usage: $0 movie.amv\n";
 
+my $dump_dir = '/tmp/dump/';
+rmtree $dump_dir if -e $dump_dir;
+mkpath $dump_dir || die "can't create $dump_dir: $!";
+
 open(my $fh, '<', $path) || die "can't open $path: $!";
 
 # offset in file
@@ -20,17 +34,28 @@
 my $d;
 
 sub hex_dump {
-	my $bytes = shift || return;
+	return unless $dump;
+
+	my ( $bytes, $offset ) = @_;
+	return unless $bytes;
+
+	my $old_o;
+	if (defined($offset)) {
+		$old_o = $o;
+		$o = $offset;
+	}
 
 	my $ascii = $bytes;
 	$ascii =~ s/\W/./gs;
-	my $hex = unpack('h*', $bytes);
+	my $hex = uc( unpack('h*', $bytes) );
 	$hex =~ s/(..)/$1 /g;
 	# calculate number of characters for offset
 	#my $d = length( sprintf("%x",length($bytes)) );
 	my $d = 4;
+	my $prefix = '#.';
 	while ( $hex =~ s/^((?:\w\w\s){1,16})// ) {
-		printf "## %0${d}x | %-48s| %s\n", $o, $1, substr( $ascii, 0, 16 );
+		printf "$prefix %0${d}x | %-48s| %s\n", $o, $1, substr( $ascii, 0, 16 );
+		$prefix = '##';
 		if ( length($ascii) >= 16 ) {
 			$ascii = substr( $ascii, 16 );
 			$o += 16;
@@ -39,6 +64,8 @@
 			last;
 		}
 	}
+
+	$o = $old_o if $old_o;
 }
 
 sub x {
@@ -60,7 +87,7 @@
 
 	if ( $format ) {
 		my @data = unpack($format, $bytes);
-		warn "## unpacked = ",dump(@data),"\n";
+		warn "## unpacked = ",dump(@data),"\n" if $debug;
 		return @data;
 	} else {
 		return $bytes;
@@ -75,19 +102,247 @@
 	if ( $expected_len ) {
 		confess "expected $expected_len bytes for $part got $len" if $len != $expected_len;
 	}
-	printf ">> %s - %d 0x%x bytes\n", $part, $len, $len;
+	printf "<< %s - %d 0x%x bytes\n", $part, $len, $len;
 	x($len) if $skip;
 	return $len;
 }
 
-my ( $riff, $amv ) = x(12, 'Z8Z4');
-die "not RIFF but $riff" if $riff ne 'RIFF';
-die "not AMV but $amv" if $amv ne 'AMV ';
+sub huffman {
+
+# JPEG DHT Segment for YCrCb omitted from MJPG data
+return
+"\xFF\xC4\x01\xA2" .
+"\x00\x00\x01\x05\x01\x01\x01\x01\x01\x01\x00\x00\x00\x00\x00" .
+"\x00\x00\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0A\x0B\x01" .
+"\x00\x03\x01\x01\x01\x01\x01\x01\x01\x01\x01\x00\x00\x00\x00" .
+"\x00\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0A\x0B\x10\x00" .
+"\x02\x01\x03\x03\x02\x04\x03\x05\x05\x04\x04\x00\x00\x01\x7D" .
+"\x01\x02\x03\x00\x04\x11\x05\x12\x21\x31\x41\x06\x13\x51\x61" .
+"\x07\x22\x71\x14\x32\x81\x91\xA1\x08\x23\x42\xB1\xC1\x15\x52" .
+"\xD1\xF0\x24\x33\x62\x72\x82\x09\x0A\x16\x17\x18\x19\x1A\x25" .
+"\x26\x27\x28\x29\x2A\x34\x35\x36\x37\x38\x39\x3A\x43\x44\x45" .
+"\x46\x47\x48\x49\x4A\x53\x54\x55\x56\x57\x58\x59\x5A\x63\x64" .
+"\x65\x66\x67\x68\x69\x6A\x73\x74\x75\x76\x77\x78\x79\x7A\x83" .
+"\x84\x85\x86\x87\x88\x89\x8A\x92\x93\x94\x95\x96\x97\x98\x99" .
+"\x9A\xA2\xA3\xA4\xA5\xA6\xA7\xA8\xA9\xAA\xB2\xB3\xB4\xB5\xB6" .
+"\xB7\xB8\xB9\xBA\xC2\xC3\xC4\xC5\xC6\xC7\xC8\xC9\xCA\xD2\xD3" .
+"\xD4\xD5\xD6\xD7\xD8\xD9\xDA\xE1\xE2\xE3\xE4\xE5\xE6\xE7\xE8" .
+"\xE9\xEA\xF1\xF2\xF3\xF4\xF5\xF6\xF7\xF8\xF9\xFA\x11\x00\x02" .
+"\x01\x02\x04\x04\x03\x04\x07\x05\x04\x04\x00\x01\x02\x77\x00" .
+"\x01\x02\x03\x11\x04\x05\x21\x31\x06\x12\x41\x51\x07\x61\x71" .
+"\x13\x22\x32\x81\x08\x14\x42\x91\xA1\xB1\xC1\x09\x23\x33\x52" .
+"\xF0\x15\x62\x72\xD1\x0A\x16\x24\x34\xE1\x25\xF1\x17\x18\x19" .
+"\x1A\x26\x27\x28\x29\x2A\x35\x36\x37\x38\x39\x3A\x43\x44\x45" .
+"\x46\x47\x48\x49\x4A\x53\x54\x55\x56\x57\x58\x59\x5A\x63\x64" .
+"\x65\x66\x67\x68\x69\x6A\x73\x74\x75\x76\x77\x78\x79\x7A\x82" .
+"\x83\x84\x85\x86\x87\x88\x89\x8A\x92\x93\x94\x95\x96\x97\x98" .
+"\x99\x9A\xA2\xA3\xA4\xA5\xA6\xA7\xA8\xA9\xAA\xB2\xB3\xB4\xB5" .
+"\xB6\xB7\xB8\xB9\xBA\xC2\xC3\xC4\xC5\xC6\xC7\xC8\xC9\xCA\xD2" .
+"\xD3\xD4\xD5\xD6\xD7\xD8\xD9\xDA\xE2\xE3\xE4\xE5\xE6\xE7\xE8" .
+"\xE9\xEA\xF2\xF3\xF4\xF5\xF6\xF7\xF8\xF9\xFA";
+
+}
+
+sub mkjpg {
+	my ($path,$data) = @_;
+	open(my $fh, '>', $path) || die "can't create $path: $!";
+
+	confess "no SOI marker in data" if substr($data,0,2) ne "\xFF\xD8";
+	$data = substr($data,2);
+
+	my $header = 
+		"\xFF\xD8".	# Start of Image (SOI) marker
+#------------------------------------------------------------------
+		"\xFF\xE0".	# JFIF marker
+	pack("nZ5CCCnnCC",
+		16,			# length
+		'JFIF',		# identifier
+		1,1,		# version
+		0,			# units (none)
+		1,1,		# X,Y density
+		0,0,		# X,Y thumbnail
+	).
+#------------------------------------------------------------------
+	"\xFF\xC0".	# Start of frame
+	pack("ncnncc9",
+		17,			# len
+		8,			# sample precision in bits
+		120,160,	# X,Y size
+		3,			# number of components
+		1,0x21,0,	# Component ID, H+V sampling factors, Quantization table number
+		2,0x11,1,
+		3,0x11,1,
+	).
+#------------------------------------------------------------------
+	"\xFF\xDB".		# Define Quantization table marker
+	"\x00\x84".		# len
+	"\x00".			# 8 bit values, (byte) table 0
+	"\x10\x0B\x0C\x0E\x0C".
+	"\x0A\x10\x0E\x0D\x0E".
+	"\x12\x11\x10\x13\x18".
+	"\x28\x1A\x18\x16\x16".
+	"\x18\x31\x23\x25\x1D".
+	"\x28\x3A\x33\x3D\x3C".
+	"\x39\x33\x38\x37\x40".
+	"\x48\x5C\x4E\x40\x44".
+	"\x57\x45\x37\x38\x50".
+	"\x6D\x51\x57\x5F\x62".
+	"\x67\x68\x67\x3E\x4D".
+	"\x71\x79\x70\x64\x78".
+	"\x5C\x65\x67\x63".
+	"\x01".		# 8 bit values, (byte) table 1
+	"\x11\x12\x12\x18\x15".
+	"\x18\x2F\x1A\x1A\x2F".
+	"\x63\x42\x38\x42\x63".
+	"\x63\x63\x63\x63\x63".
+	"\x63\x63\x63\x63\x63".
+	"\x63\x63\x63\x63\x63".
+	"\x63\x63\x63\x63\x63".
+	"\x63\x63\x63\x63\x63".
+	"\x63\x63\x63\x63\x63".
+	"\x63\x63\x63\x63\x63".
+	"\x63\x63\x63\x63\x63".
+	"\x63\x63\x63\x63\x63".
+	"\x63\x63\x63\x63".
+#------------------------------------------------------------------
+#	huffman("\x00").	# 0 DC
+#	huffman("\x01").	# 1 DC
+#	huffman("\x10").	# 0 AC
+#	huffman("\x11").	# 1 AC
+#------------------------------------------------------------------
+	# Define huffman table (section B.2.4.1)
+	"\xFF\xC4".		# Marker
+	"\x00\x1F".		# Length (31 bytes)
+	"\x00".			# DC, (byte) table 0
+	"\x00\x01\x05\x01\x01".
+	"\x01\x01\x01\x01\x00".
+	"\x00\x00\x00\x00\x00".
+	"\x00\x00\x01\x02\x03".
+	"\x04\x05\x06\x07\x08".
+	"\x09\x0A\x0B".
+	# Define huffman table (section B.2.4.1)
+	"\xFF\xC4".		# Marker
+	"\x00\xB5".		# Length (181 bytes)
+	"\x10".			# AC, (byte) table 0
+	"\x00\x02\x01\x03\x03".
+	"\x02\x04\x03\x05\x05".
+	"\x04\x04\x00\x00\x01".
+	"\x7D\x01\x02\x03\x00".
+	"\x04\x11\x05\x12\x21".
+	"\x31\x41\x06\x13\x51".
+	"\x61\x07\x22\x71\x14".
+	"\x32\x81\x91\xA1\x08".
+	"\x23\x42\xB1\xC1\x15".
+	"\x52\xD1\xF0\x24\x33".
+	"\x62\x72\x82\x09\x0A".
+	"\x16\x17\x18\x19\x1A".
+	"\x25\x26\x27\x28\x29".
+	"\x2A\x34\x35\x36\x37".
+	"\x38\x39\x3A\x43\x44".
+	"\x45\x46\x47\x48\x49".
+	"\x4A\x53\x54\x55\x56".
+	"\x57\x58\x59\x5A\x63".
+	"\x64\x65\x66\x67\x68".
+	"\x69\x6A\x73\x74\x75".
+	"\x76\x77\x78\x79\x7A".
+	"\x83\x84\x85\x86\x87".
+	"\x88\x89\x8A\x92\x93".
+	"\x94\x95\x96\x97\x98".
+	"\x99\x9A\xA2\xA3\xA4".
+	"\xA5\xA6\xA7\xA8\xA9".
+	"\xAA\xB2\xB3\xB4\xB5".
+	"\xB6\xB7\xB8\xB9\xBA".
+	"\xC2\xC3\xC4\xC5\xC6".
+	"\xC7\xC8\xC9\xCA\xD2".
+	"\xD3\xD4\xD5\xD6\xD7".
+	"\xD8\xD9\xDA\xE1\xE2".
+	"\xE3\xE4\xE5\xE6\xE7".
+	"\xE8\xE9\xEA\xF1\xF2".
+	"\xF3\xF4\xF5\xF6\xF7".
+	"\xF8\xF9\xFA".
+	# Define huffman table (section B.2.4.1)
+	"\xFF\xC4".		# Marker
+	"\x00\x1F".		# Length (31 bytes)
+	"\x01".			# DC, (byte) table 1
+	"\x00\x03\x01\x01\x01".
+	"\x01\x01\x01\x01\x01".
+	"\x01\x00\x00\x00\x00".
+	"\x00\x00\x01\x02\x03".
+	"\x04\x05\x06\x07\x08".
+	"\x09\x0A\x0B".
+	# Define huffman table (section B.2.4.1)
+	"\xFF\xC4".		# Marker
+	"\x00\xB5".		# Length (181 bytes)
+	"\x11".			# AC, (byte) table 1
+	"\x00\x02\x01\x02\x04".
+	"\x04\x03\x04\x07\x05".
+	"\x04\x04\x00\x01\x02".
+	"\x77\x00\x01\x02\x03".
+	"\x11\x04\x05\x21\x31".
+	"\x06\x12\x41\x51\x07".
+	"\x61\x71\x13\x22\x32".
+	"\x81\x08\x14\x42\x91".
+	"\xA1\xB1\xC1\x09\x23".
+	"\x33\x52\xF0\x15\x62".
+	"\x72\xD1\x0A\x16\x24".
+	"\x34\xE1\x25\xF1\x17".
+	"\x18\x19\x1A\x26\x27".
+	"\x28\x29\x2A\x35\x36".
+	"\x37\x38\x39\x3A\x43".
+	"\x44\x45\x46\x47\x48".
+	"\x49\x4A\x53\x54\x55".
+	"\x56\x57\x58\x59\x5A".
+	"\x63\x64\x65\x66\x67".
+	"\x68\x69\x6A\x73\x74".
+	"\x75\x76\x77\x78\x79".
+	"\x7A\x82\x83\x84\x85".
+	"\x86\x87\x88\x89\x8A".
+	"\x92\x93\x94\x95\x96".
+	"\x97\x98\x99\x9A\xA2".
+	"\xA3\xA4\xA5\xA6\xA7".
+	"\xA8\xA9\xAA\xB2\xB3".
+	"\xB4\xB5\xB6\xB7\xB8".
+	"\xB9\xBA\xC2\xC3\xC4".
+	"\xC5\xC6\xC7\xC8\xC9".
+	"\xCA\xD2\xD3\xD4\xD5".
+	"\xD6\xD7\xD8\xD9\xDA".
+	"\xE2\xE3\xE4\xE5\xE6".
+	"\xE7\xE8\xE9\xEA\xF2".
+	"\xF3\xF4\xF5\xF6\xF7".
+	"\xF8\xF9\xFA".
+#------------------------------------------------------------------
+		"\xFF\xDA".	# Start of Scan marker
+	pack("nC11",
+		12,			# length
+		3,			# number of components
+		1,0x00,		# Scan 1: use DC/AC huff tables 0/0
+		2,0x11,		# Scan 2: use DC/AC huff tables 1/1
+		3,0x11,		# Scan 3: use DC/AC huff tables 1/1
+		0,0x3f,		# Ss, Se
+		0,			# Ah, Ai (not used)
+	);
+#------------------------------------------------------------------
+
+
+	if ( $dump ) {
+		warn "## created JPEG header...\n";
+		hex_dump( $header, 0 );
+	}
+
+	print $fh $header || die "can't write header into $path: $!";
+	print $fh $data || die "can't write frame into $path: $!";
+	close $fh || die "can't close $path: $!";
+	print ">> created $path ", -s $path, " bytes\n";
+}
+
+my ( $riff, $amv ) = x(12, 'Z4x4Z4');
+die "$path not RIFF but $riff" if $riff ne 'RIFF';
+die "$path not AMV but $amv" if $amv ne 'AMV ';
 
 while ( ! defined($d->{eof}) ) {
 	my ( $list, $name ) = x(12,'A4x4A4');
 	die "not LIST but $list" if $list ne 'LIST';
-	print "> $list .. $name\n";
+	print "< $list * $name\n";
 
 	if ( $name eq 'hdrl' ) {
 
@@ -102,7 +357,7 @@
 		} x($len, 'Vx28VVVx8CCv');
 
 		printf "## %s %d*%d %s fps (%d ms/frame) %02d:%02d:%02d\n",
-			$h->{path},
+			$path,
 			$h->{width}, $h->{height}, $h->{fps}, $h->{ms_per_frame},
 			$h->{hh}, $h->{mm}, $h->{ss};
 
@@ -118,12 +373,13 @@
 		while (1) {
 			my $frame = $d->{movi}++;
 		
-			my $len = next_part( '00dc', 0, 1 );
+			my $len = next_part( '00dc' );
 			last unless $len;
-			printf ">> %s 00dc - frame %d jpeg %d 0x%x bytes\n", $name, $frame, $len, $len;
+			printf "<< %s 00dc - frame %d jpeg %d 0x%x bytes\n", $name, $frame, $len, $len;
+			mkjpg( sprintf("$dump_dir/%03d.jpg", $frame ), x($len) );
 
-			my $len = next_part( '01wb', 0, 1 );
-			printf ">> %s 01wb - frame %d audio %d 0x%x bytes\n", $name, $frame, $len, $len;
+			$len = next_part( '01wb', 0, 1 );
+			printf "<< %s 01wb - frame %d audio %d 0x%x bytes\n", $name, $frame, $len, $len;
 		};
 
 	} else {