/usr/share/perl5/Parse/EDID.pm is in libparse-edid-perl 1.0.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Pascal Rigaux
# Anssi Hannula
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
package Parse::EDID;
use strict;
use warnings;
use base 'Exporter';
our $VERSION = '1.0.6';
our @EXPORT = qw(
parse_edid
check_parsed_edid
find_edid_in_string
);
my @CVT_ratios = qw(5/4 4/3 3/2 16/10 15/9 16/9);
my @known_ratios = @CVT_ratios;
my @edid_info = _group_by2(
a8 => '_header',
a2 => 'manufacturer_name',
v => 'product_code',
V => 'serial_number',
C => 'week',
C => 'year',
C => 'edid_version',
C => 'edid_revision',
a => 'video_input_definition',
C => 'max_size_horizontal', # in cm, 0 on projectors
C => 'max_size_vertical', # in cm, 0 on projectors
C => 'gamma',
a => 'feature_support',
a10 => '_color_characteristics',
a3 => 'established_timings',
a16 => 'standard_timings',
a72 => 'monitor_details',
C => 'extension_flag',
C => 'checksum',
);
my %subfields = (
manufacturer_name => [ _group_by2(
1 => '',
5 => '1',
5 => '2',
5 => '3',
) ],
video_input_definition => [ _group_by2(
1 => 'digital',
1 => 'separate_sync',
1 => 'composite_sync',
1 => 'sync_on_green',
2 => '',
2 => 'voltage_level',
) ],
feature_support => [ _group_by2(
1 => 'DPMS_standby',
1 => 'DPMS_suspend',
1 => 'DPMS_active_off',
1 => 'rgb',
1 => '',
1 => 'sRGB_compliance',
1 => 'has_preferred_timing',
1 => 'GTF_compliance',
) ],
established_timings => [ _group_by2(
1 => '720x400_70',
1 => '720x400_88',
1 => '640x480_60',
1 => '640x480_67',
1 => '640x480_72',
1 => '640x480_75',
1 => '800x600_56',
1 => '800x600_60',
1 => '800x600_72',
1 => '800x600_75',
1 => '832x624_75',
1 => '1024x768_87i',
1 => '1024x768_60',
1 => '1024x768_70',
1 => '1024x768_75',
1 => '1280x1024_75',
) ],
detailed_timing => [ _group_by2(
8 => 'horizontal_active',
8 => 'horizontal_blanking',
4 => 'horizontal_active_hi',
4 => 'horizontal_blanking_hi',
8 => 'vertical_active',
8 => 'vertical_blanking',
4 => 'vertical_active_hi',
4 => 'vertical_blanking_hi',
8 => 'horizontal_sync_offset',
8 => 'horizontal_sync_pulse_width',
4 => 'vertical_sync_offset',
4 => 'vertical_sync_pulse_width',
2 => 'horizontal_sync_offset_hi',
2 => 'horizontal_sync_pulse_width_hi',
2 => 'vertical_sync_offset_hi',
2 => 'vertical_sync_pulse_width_hi',
8 => 'horizontal_image_size', # in mm
8 => 'vertical_image_size', # in mm
4 => 'horizontal_image_size_hi',
4 => 'vertical_image_size_hi',
8 => 'horizontal_border',
8 => 'vertical_border',
1 => 'interlaced',
2 => 'stereo',
2 => 'digital_composite',
1 => 'horizontal_sync_positive',
1 => 'vertical_sync_positive',
1 => '',
) ],
standard_timing => [ _group_by2(
8 => 'X',
2 => 'aspect',
6 => 'vfreq',
) ],
monitor_range => [ _group_by2(
8 => 'vertical_min',
8 => 'vertical_max',
8 => 'horizontal_min',
8 => 'horizontal_max',
8 => 'pixel_clock_max',
) ],
manufacturer_specified_range_timing => [ _group_by2(
# http://www.spwg.org/salisbury_march_19_2002.pdf
# for the glossary: http://www.vesa.org/Public/PSWG/PSWG15v1.pdf
8 => 'horizontal_sync_pulse_width_min', # HSPW (Horizontal Sync Pulse Width)
8 => 'horizontal_sync_pulse_width_max',
8 => 'horizontal_back_porch_min', # t_hbp
8 => 'horizontal_back_porch_max',
8 => 'vertical_sync_pulse_width_min', # VSPW (Vertical Sync Pulse Width)
8 => 'vertical_sync_pulse_width_max',
8 => 'vertical_back_porch_min', # t_vbp (Vertical Back Porch)
8 => 'vertical_back_porch_max',
8 => 'horizontal_blanking_min', # t_hp (Horizontal Period)
8 => 'horizontal_blanking_max',
8 => 'vertical_blanking_min', # t_vp
8 => 'vertical_blanking_max',
8 => 'module_revision',
) ],
cea_data_block_collection => [ _group_by2(
3 => 'type',
5 => 'size',
) ],
cea_video_data_block => [ _group_by2(
1 => 'native',
7 => 'mode',
) ],
);
my @cea_video_mode_to_detailed_timing = (
'pixel_clock',
'horizontal_active',
'vertical_active',
'aspect',
'horizontal_blanking',
'horizontal_sync_offset',
'horizontal_sync_pulse_width',
'vertical_blanking',
'vertical_sync_offset',
'vertical_sync_pulse_width',
'horizontal_sync_positive',
'vertical_sync_positive',
'interlaced'
);
my @cea_video_modes = (
# [0] pixel clock, [1] X, [2] Y, [3] aspect, [4] Hblank, [5] Hsync_offset, [6] Hsync_pulse_width,
# [7] Vblank, [8] Vsync_offset, [9] Vsync_pulse_width, [10] Hsync+, [11] Vsync+, [12] interlaced
# 59.94/29.97 and similar modes also have a 60.00/30.00 counterpart by raising the pixel clock
[ 25.175, 640, 480, "4/3", 160, 16, 96, 45, 10, 2, 0, 0, 0 ], # 1: 640x 480@59.94
[ 27.000, 720, 480, "4/3", 138, 16, 62, 45, 9, 6, 0, 0, 0 ], # 2: 720x 480@59.94
[ 27.000, 720, 480, "16/9", 138, 16, 62, 45, 9, 6, 0, 0, 0 ], # 3: 720x 480@59.94
[ 74.250, 1280, 720, "16/9", 370, 110, 40, 30, 5, 5, 1, 1, 0 ], # 4: 1280x 720@60.00
[ 74.250, 1920, 1080, "16/9", 280, 88, 44, 45, 4, 10, 1, 1, 1 ], # 5: 1920x1080@30.00
[ 27.000, 1440, 480, "4/3", 276, 38, 124, 45, 8, 6, 0, 0, 1 ], # 6: 1440x 480@29.97
[ 27.000, 1440, 480, "16/9", 276, 38, 124, 45, 8, 6, 0, 0, 1 ], # 7: 1440x 480@29.97
[ 27.000, 1440, 240, "4/3", 276, 38, 124, 22, 4, 3, 0, 0, 0 ], # 8: 1440x 240@60.05
[ 27.000, 1440, 240, "16/9", 276, 38, 124, 22, 4, 3, 0, 0, 0 ], # 9: 1440x 240@60.05
[ 54.000, 2880, 480, "4/3", 552, 76, 248, 45, 8, 6, 0, 0, 1 ], # 10: 2880x 480@29.97
[ 54.000, 2880, 480, "16/9", 552, 76, 248, 45, 8, 6, 0, 0, 1 ], # 11: 2880x 480@29.97
[ 54.000, 2880, 240, "4/3", 552, 76, 248, 22, 4, 3, 0, 0, 0 ], # 12: 2880x 240@60.05
[ 54.000, 2880, 240, "16/9", 552, 76, 248, 22, 4, 3, 0, 0, 0 ], # 13: 2880x 240@60.05
[ 54.000, 1440, 480, "4/3", 276, 32, 124, 45, 9, 6, 0, 0, 0 ], # 14: 1440x 480@59.94
[ 54.000, 1440, 480, "16/9", 276, 32, 124, 45, 9, 6, 0, 0, 0 ], # 15: 1440x 480@59.94
[ 148.500, 1920, 1080, "16/9", 280, 88, 44, 45, 4, 5, 1, 1, 0 ], # 16: 1920x1080@60.00
[ 27.000, 720, 576, "4/3", 144, 12, 64, 49, 5, 5, 0, 0, 0 ], # 17: 720x 576@50.00
[ 27.000, 720, 576, "16/9", 144, 12, 64, 49, 5, 5, 0, 0, 0 ], # 18: 720x 576@50.00
[ 74.250, 1280, 720, "16/9", 700, 440, 40, 30, 5, 5, 1, 1, 0 ], # 19: 1280x 720@50.00
[ 74.250, 1920, 1080, "16/9", 720, 528, 44, 45, 4, 10, 1, 1, 1 ], # 20: 1920x1080@25.00
[ 27.000, 1440, 576, "4/3", 288, 24, 126, 49, 4, 6, 0, 0, 1 ], # 21: 1440x 576@25.00
[ 27.000, 1440, 576, "16/9", 288, 24, 126, 49, 4, 6, 0, 0, 1 ], # 22: 1440x 576@25.00
[ 27.000, 1440, 288, "4/3", 288, 24, 126, 24, 2, 3, 0, 0, 0 ], # 23: 1440x 288@50.08
[ 27.000, 1440, 288, "16/9", 288, 24, 126, 24, 2, 3, 0, 0, 0 ], # 24: 1440x 288@50.08
[ 54.000, 2880, 576, "4/3", 576, 48, 252, 49, 4, 6, 0, 0, 1 ], # 25: 2880x 576@25.00
[ 54.000, 2880, 576, "16/9", 576, 48, 252, 49, 4, 6, 0, 0, 1 ], # 26: 2880x 576@25.00
[ 54.000, 2880, 288, "4/3", 576, 48, 252, 24, 2, 3, 0, 0, 0 ], # 27: 2880x 288@50.08
[ 54.000, 2880, 288, "16/9", 576, 48, 252, 24, 2, 3, 0, 0, 0 ], # 28: 2880x 288@50.08
[ 54.000, 1440, 576, "4/3", 288, 24, 128, 49, 5, 5, 0, 0, 0 ], # 29: 1440x 576@50.00
[ 54.000, 1440, 576, "16/9", 288, 24, 128, 49, 5, 5, 0, 0, 0 ], # 30: 1440x 576@50.00
[ 148.500, 1920, 1080, "16/9", 720, 528, 44, 45, 4, 5, 1, 1, 0 ], # 31: 1920x1080@50.00
[ 74.250, 1920, 1080, "16/9", 830, 638, 44, 45, 4, 5, 1, 1, 0 ], # 32: 1920x1080@24.00
[ 74.250, 1920, 1080, "16/9", 720, 528, 44, 45, 4, 5, 1, 1, 0 ], # 33: 1920x1080@25.00
[ 74.250, 1920, 1080, "16/9", 280, 88, 44, 45, 4, 5, 1, 1, 0 ], # 34: 1920x1080@30.00
[ 108.000, 2880, 480, "4/3", 552, 64, 248, 45, 9, 6, 0, 0, 0 ], # 35: 2880x 480@59.94
[ 108.000, 2880, 480, "16/9", 552, 64, 248, 45, 9, 6, 0, 0, 0 ], # 36: 2880x 480@59.94
[ 108.000, 2880, 576, "4/3", 576, 48, 256, 49, 5, 5, 0, 0, 0 ], # 37: 2880x 576@50.00
[ 108.000, 2880, 576, "16/9", 576, 48, 256, 49, 5, 5, 0, 0, 0 ], # 38: 2880x 576@50.00
[ 72.000, 1920, 1080, "16/9", 384, 32, 168, 170, 46, 10, 1, 0, 1 ], # 39: 1920x1080@25.00
[ 148.500, 1920, 1080, "16/9", 720, 528, 44, 45, 4, 10, 1, 1, 1 ], # 40: 1920x1080@50.00
[ 148.500, 1280, 720, "16/9", 700, 440, 40, 30, 5, 5, 1, 1, 0 ], # 41: 1280x 720@100.00
[ 54.000, 720, 576, "4/3", 144, 12, 64, 49, 5, 5, 0, 0, 0 ], # 42: 720x 576@100.00
[ 54.000, 720, 576, "16/9", 144, 12, 64, 49, 5, 5, 0, 0, 0 ], # 43: 720x 576@100.00
[ 54.000, 1440, 576, "4/3", 288, 24, 126, 49, 4, 6, 0, 0, 0 ], # 44: 1440x 576@50.00
[ 54.000, 1440, 576, "16/9", 288, 24, 126, 49, 4, 6, 0, 0, 0 ], # 45: 1440x 576@50.00
[ 148.500, 1920, 1080, "16/9", 280, 88, 44, 45, 4, 10, 1, 1, 1 ], # 46: 1920x1080@60.00
[ 148.500, 1280, 720, "16/9", 370, 110, 40, 30, 5, 5, 1, 1, 0 ], # 47: 1280x 720@120.00
[ 54.000, 720, 480, "4/3", 138, 16, 62, 45, 9, 6, 0, 0, 0 ], # 48: 720x 480@119.88
[ 54.000, 720, 480, "16/9", 138, 16, 62, 45, 9, 6, 0, 0, 0 ], # 49: 720x 480@119.88
[ 54.000, 1440, 480, "4/3", 276, 38, 124, 45, 8, 6, 0, 0, 1 ], # 50: 1440x 480@59.94
[ 54.000, 1440, 480, "16/9", 276, 38, 124, 45, 8, 6, 0, 0, 1 ], # 51: 1440x 480@59.94
[ 108.000, 720, 576, "4/3", 144, 12, 64, 49, 5, 5, 0, 0, 0 ], # 52: 720x 576@200.00
[ 108.000, 720, 576, "16/9", 144, 12, 64, 49, 5, 5, 0, 0, 0 ], # 53: 720x 576@200.00
[ 108.000, 1440, 576, "4/3", 288, 24, 126, 49, 4, 6, 0, 0, 1 ], # 54: 1440x 576@100.00
[ 108.000, 1440, 576, "16/9", 288, 24, 126, 49, 4, 6, 0, 0, 1 ], # 55: 1440x 576@100.00
[ 108.000, 720, 480, "4/3", 138, 16, 62, 45, 9, 6, 0, 0, 0 ], # 56: 720x 480@239.76
[ 108.000, 720, 480, "16/9", 138, 16, 62, 45, 9, 6, 0, 0, 0 ], # 57: 720x 480@239.76
[ 108.000, 1440, 480, "4/3", 276, 38, 124, 45, 8, 6, 0, 0, 1 ], # 58: 1440x 480@119.88
[ 108.000, 1440, 480, "16/9", 276, 38, 124, 45, 8, 6, 0, 0, 1 ], # 59: 1440x 480@119.88
[ 59.400, 1280, 720, "16/9", 2020, 1760, 40, 30, 5, 5, 1, 1, 0 ], # 60: 1280x 720@24.00
[ 74.250, 1280, 720, "16/9", 2680, 2420, 40, 30, 5, 5, 1, 1, 0 ], # 61: 1280x 720@25.00
[ 74.250, 1280, 720, "16/9", 2020, 1760, 40, 30, 5, 5, 1, 1, 0 ], # 62: 1280x 720@30.00
[ 297.000, 1920, 1080, "16/9", 280, 88, 44, 45, 4, 5, 1, 1, 0 ], # 63: 1920x1080@120.00
[ 297.000, 1920, 1080, "16/9", 720, 528, 44, 45, 4, 10, 1, 1, 0 ], # 64: 1920x1080@100.00
);
sub _within_limit {
my ($value, $type, $limit) = @_;
$type eq 'min' ? $value >= $limit : $value <= $limit;
}
sub _get_many_bits {
my ($s, $field_name) = @_;
my @bits = split('', unpack('B*', $s));
my %h;
foreach (@{$subfields{$field_name}}) {
my ($size, $field) = @$_;
my @l = ('0' x (8 - $size), splice(@bits, 0, $size));
$h{$field} = unpack("C", pack('B*', join('', @l))) if $field && $field !~ /^_/;
}
\%h;
}
sub check_parsed_edid {
my ($edid) = @_;
$edid->{edid_version} >= 1 && $edid->{edid_version} <= 2 or return 'bad edid_version';
$edid->{edid_revision} != 0xff or return 'bad edid_revision';
if ($edid->{monitor_range}) {
$edid->{monitor_range}{horizontal_min} &&
$edid->{monitor_range}{horizontal_min} <= $edid->{monitor_range}{horizontal_max}
or return 'bad HorizSync';
$edid->{monitor_range}{vertical_min} &&
$edid->{monitor_range}{vertical_min} <= $edid->{monitor_range}{vertical_max}
or return 'bad VertRefresh';
}
'';
}
sub _build_detailed_timing {
my ($pixel_clock, $vv) = @_;
my $h = _get_many_bits($vv, 'detailed_timing');
$h->{pixel_clock} = $pixel_clock / 100; # to have it in MHz
my %detailed_timing_field_size = map { $_->[1], $_->[0] } @{$subfields{detailed_timing}};
foreach my $field (keys %detailed_timing_field_size) {
$field =~ s/_hi$// or next;
my $hi = delete($h->{$field . '_hi'});
$h->{$field} += $hi << $detailed_timing_field_size{$field};
}
$h;
}
sub _add_standard_timing_modes {
my ($edid, $v) = @_;
my @aspect2ratio = (
$edid->{edid_version} > 1 || $edid->{edid_revision} > 2 ? '16/10' : '1/1',
'4/3', '5/4', '16/9',
);
$v = [ map {
my $h = _get_many_bits($_, 'standard_timing');
$h->{X} = ($h->{X} + 31) * 8;
if ($_ ne "\x20\x20" && $h->{X} > 256) { # cf VALID_TIMING in Xorg edid.h
$h->{vfreq} += 60;
if ($h->{ratio} = $aspect2ratio[$h->{aspect}]) {
delete $h->{aspect};
$h->{Y} = $h->{X} / eval($h->{ratio});
}
$h;
} else { () }
} unpack('a2' x (length($v) / 2), $v) ];
$v;
}
sub parse_edid {
my ($raw_edid, $verbose) = @_;
my %edid;
my ($main_edid, @eedid_blocks) = unpack("a128" x (length($raw_edid) / 128), $raw_edid);
my @vals = unpack(join('', map { $_->[0] } @edid_info), $main_edid);
my $i;
foreach (@edid_info) {
my ($field, $v) = ($_->[1], $vals[$i++]);
if ($field eq 'year') {
$v += 1990;
} elsif ($field eq 'manufacturer_name') {
my $h = _get_many_bits($v, 'manufacturer_name');
$v = join('', map { chr(ord('A') + $h->{$_} - 1) } 1 .. 3);
$v = "" if $v eq "@@@";
} elsif ($field eq 'video_input_definition') {
$v = _get_many_bits($v, 'video_input_definition');
} elsif ($field eq 'feature_support') {
$v = _get_many_bits($v, 'feature_support');
} elsif ($field eq 'established_timings') {
my $h = _get_many_bits($v, 'established_timings');
$v = [
sort { $a->{X} <=> $b->{X} || $a->{vfreq} <=> $b->{vfreq} }
map { /(\d+)x(\d+)_(\d+)(i?)/ ? { X => $1, Y => $2, vfreq => $3, $4 ? (interlace => 1) : () } : () }
grep { $h->{$_} } keys %$h ];
} elsif ($field eq 'standard_timings') {
$v = _add_standard_timing_modes(\%edid, $v);
} elsif ($field eq 'monitor_details') {
while ($v) {
(my $pixel_clock, my $vv, $v) = unpack("v a16 a*", $v);
if ($pixel_clock) {
# detailed timing
my $h = _build_detailed_timing($pixel_clock, $vv);
push @{$edid{detailed_timings}}, $h
if $h->{horizontal_active} > 1 && $h->{vertical_active} > 1;
} else {
(my $flag, $vv) = unpack("n x a*", $vv);
if ($flag == 0xfd) {
# range
$edid{monitor_range} = _get_many_bits($vv, 'monitor_range');
if ($edid{monitor_range}{pixel_clock_max} == 0xff) {
delete $edid{monitor_range}{pixel_clock_max};
} else {
$edid{monitor_range}{pixel_clock_max} *= 10; #- to have it in MHz
}
} elsif ($flag == 0xf) {
my $range = _get_many_bits($vv, 'manufacturer_specified_range_timing');
my $e = $edid{detailed_timings}[0];
my $valid = 1;
foreach my $m ('min', 'max') {
my %total;
foreach my $dir ('horizontal', 'vertical') {
$range->{$dir . '_sync_pulse_width_' . $m} *= 2;
$range->{$dir . '_back_porch_' . $m} *= 2;
$range->{$dir . '_blanking_' . $m} *= 2;
if ($e && $e->{$dir . '_active'}
&& _within_limit($e->{$dir . '_blanking'}, $m, $range->{$dir . '_blanking_' . $m})
&& _within_limit($e->{$dir . '_sync_pulse_width'}, $m, $range->{$dir . '_sync_pulse_width_' . $m})
&& _within_limit($e->{$dir . '_blanking'} - $e->{$dir . '_sync_offset'} - $e->{$dir . '_sync_pulse_width'},
$m, $range->{$dir . '_back_porch_' . $m})) {
$total{$dir} = $e->{$dir . '_active'} + $range->{$dir . '_blanking_' . $m};
}
}
if ($total{horizontal} && $total{vertical}) {
my $hfreq = $e->{pixel_clock} * 1000 / $total{horizontal};
my $vfreq = $hfreq * 1000 / $total{vertical};
$range->{'horizontal_' . ($m eq 'min' ? 'max' : 'min')} = _round($hfreq);
$range->{'vertical_' . ($m eq 'min' ? 'max' : 'min')} = _round($vfreq);
} else {
$valid = 0;
}
}
$edid{$valid ? 'monitor_range' : 'manufacturer_specified_range_timing'} = $range;
} elsif ($flag == 0xfa) {
push @{$edid{standard_timings}}, _add_standard_timing_modes(\%edid, unpack('a12', $vv));
} elsif ($flag == 0xfc) {
my $prev = $edid{monitor_name};
$edid{monitor_name} = ($prev ? "$prev " : '') . unpack('A13', $vv);
} elsif ($flag == 0xfe) {
push @{$edid{monitor_text}}, unpack('A13', $vv);
} elsif ($flag == 0xff) {
push @{$edid{serial_number2}}, unpack('A13', $vv);
} else {
$verbose && $vv ne "\0" x 13 && $vv ne " " x 13 and
warn "parse_edid: unknown flag $flag\n";
}
}
}
}
$edid{$field} = $v if $field && $field !~ /^_/;
}
foreach (@eedid_blocks) {
my ($tag, $v) = unpack("C a*", $_);
if ($tag == 0x02) { # CEA EDID
my $dtd_offset;
($dtd_offset, $v) = unpack("x C x a*", $v);
next if $dtd_offset < 4;
$dtd_offset -= 4;
while ($dtd_offset > 0) {
my $h = _get_many_bits($v, 'cea_data_block_collection');
$dtd_offset -= $h->{size} + 1;
my $vv;
($vv, $v) = unpack("x a$h->{size} a*", $v);
if ($h->{type} == 0x02) { # Video Data Block
my @vmodes = unpack("a" x $h->{size}, $vv);
foreach my $vmode (@vmodes) {
$h = _get_many_bits($vmode, 'cea_video_data_block');
my $cea_mode = $cea_video_modes[$h->{mode} - 1];
if (!$cea_mode) {
warn "parse_edid: unhandled CEA mode $h->{mode}\n" if $verbose;
next;
}
my %det_mode = (source => 'cea_vdb');
@det_mode{@cea_video_mode_to_detailed_timing} = @$cea_mode;
push @{$edid{detailed_timings}}, \%det_mode;
}
}
}
while (length($v) >= 18) {
(my $pixel_clock, my $vv, $v) = unpack("v a16 a*", $v);
last if !$pixel_clock;
my $h = _build_detailed_timing($pixel_clock, $vv);
push @{$edid{detailed_timings}}, $h
if $h->{horizontal_active} > 1 && $h->{vertical_active} > 1;
}
} else {
$verbose && warn "parse_edid: unknown tag $tag\n";
}
}
$edid{max_size_precision} = 'cm';
$edid{EISA_ID} = $edid{manufacturer_name} . sprintf('%04x', $edid{product_code}) if $edid{product_code} && $edid{manufacturer_name};
if ($edid{monitor_range}) {
$edid{HorizSync} = $edid{monitor_range}{horizontal_min} . '-' . $edid{monitor_range}{horizontal_max};
$edid{VertRefresh} = $edid{monitor_range}{vertical_min} . '-' . $edid{monitor_range}{vertical_max};
}
if ($edid{max_size_vertical}) {
$edid{ratio} = $edid{max_size_horizontal} / $edid{max_size_vertical};
$edid{ratio_name} = _ratio_name($edid{max_size_horizontal}, $edid{max_size_vertical}, 'cm');
$edid{ratio_precision} = 'cm';
}
if ($edid{feature_support}{has_preferred_timing} && $edid{detailed_timings}[0]) {
$edid{detailed_timings}[0]{preferred} = 1;
}
foreach my $h (@{$edid{detailed_timings}}) {
# EDID standard is ambiguous on how interlaced modes should be
# specified; workaround clearly broken modes:
if ($h->{interlaced}) {
foreach ("720x480", "1440x480", "2880x480", "720x576", "1440x576", "2880x576", "1920x1080") {
if ($_ eq $h->{horizontal_active} . 'x' . $h->{vertical_active} * 2) {
$h->{vertical_active} *= 2;
$h->{vertical_blanking} *= 2;
$h->{vertical_sync_offset} *= 2;
$h->{vertical_sync_pulse_width} *= 2;
$h->{vertical_blanking} |= 1;
}
}
}
# if the mm size given in the detailed_timing is not far from the cm size
# put it as a more precise cm size
my %in_cm = (
horizontal => _define($h->{horizontal_image_size}) / 10,
vertical => _define($h->{vertical_image_size}) / 10,
);
my ($error) = sort { $b <=> $a } map { abs($edid{'max_size_' . $_} - $in_cm{$_}) } keys %in_cm;
if ($error <= 0.5) {
$edid{'max_size_' . $_} = $in_cm{$_} foreach keys %in_cm;
$edid{max_size_precision} = 'mm';
}
if ($error < 1 && $in_cm{vertical}) {
# using it for the ratio
$edid{ratio} = $in_cm{horizontal} / $in_cm{vertical};
$edid{ratio_name} = _ratio_name($in_cm{horizontal}, $in_cm{vertical}, 'mm');
$edid{ratio_precision} = 'mm';
}
$h->{bad_ratio} = 1 if abs($edid{ratio} - $h->{horizontal_active} / $h->{vertical_active}) > ($edid{ratio_precision} eq 'mm' ? 0.02 : 0.2);
if ($edid{max_size_vertical}) {
$h->{vertical_dpi} = $h->{vertical_active} / $edid{max_size_vertical} * 2.54;
}
if ($edid{max_size_horizontal}) {
$h->{horizontal_dpi} = $h->{horizontal_active} / $edid{max_size_horizontal} * 2.54;
}
my $dpi_string = '';
if ($h->{vertical_dpi} && $h->{horizontal_dpi}) {
$dpi_string =
abs($h->{vertical_dpi} / $h->{horizontal_dpi} - 1) < 0.05 ?
sprintf("%d dpi", $h->{horizontal_dpi}) :
sprintf("%dx%d dpi", $h->{horizontal_dpi}, $h->{vertical_dpi});
}
my $horizontal_total = $h->{horizontal_active} + $h->{horizontal_blanking};
my $vertical_total = $h->{vertical_active} + $h->{vertical_blanking};
no warnings 'uninitialized';
$h->{ModeLine_comment} = sprintf qq(# Monitor %s%s modeline (%.1f Hz vsync, %.1f kHz hsync, %sratio %s%s)),
$h->{preferred} ? "preferred" : "supported",
$h->{source} eq 'cea_vdb' ? " CEA" : '',
$h->{pixel_clock} / $horizontal_total / $vertical_total * 1000 * 1000 * ($h->{interlaced} ? 2 : 1),
$h->{pixel_clock} / $horizontal_total * 1000,
$h->{interlaced} ? "interlaced, " : '',
_nearest_ratio($h->{horizontal_active} / $h->{vertical_active}, 0.01) || sprintf("%.2f", $h->{horizontal_active} / $h->{vertical_active}),
$dpi_string ? ", $dpi_string" : '';
$h->{ModeLine} = sprintf qq("%dx%d" $h->{pixel_clock} %d %d %d %d %d %d %d %d %shsync %svsync%s),
$h->{horizontal_active}, $h->{vertical_active},
$h->{horizontal_active},
$h->{horizontal_active} + $h->{horizontal_sync_offset},
$h->{horizontal_active} + $h->{horizontal_sync_offset} + $h->{horizontal_sync_pulse_width},
$horizontal_total,
$h->{vertical_active},
$h->{vertical_active} + $h->{vertical_sync_offset},
$h->{vertical_active} + $h->{vertical_sync_offset} + $h->{vertical_sync_pulse_width},
$vertical_total,
$h->{horizontal_sync_positive} ? '+' : '-',
$h->{vertical_sync_positive} ? '+' : '-',
$h->{interlaced} ? ' Interlace' : '';
}
$edid{diagonal_size} = sqrt(_sqr($edid{max_size_horizontal}) +
_sqr($edid{max_size_vertical})) / 2.54;
\%edid;
}
sub _nearest_ratio {
my ($ratio, $max_error) = @_;
my @sorted =
sort { $a->[1] <=> $b->[1] }
map {
my $error = abs($ratio - eval($_));
$error > $max_error ? () : [ $_, $error ];
} @known_ratios;
$sorted[0][0];
}
sub _ratio_name {
my ($horizontal, $vertical, $precision) = @_;
if ($precision eq 'mm') {
_nearest_ratio($horizontal / $vertical, 0.1);
} else {
my $error = 0.5;
my $ratio1 = _nearest_ratio(($horizontal + $error) / ($vertical - $error), 0.2);
my $ratio2 = _nearest_ratio(($horizontal - $error) / ($vertical + $error), 0.2);
$ratio1 && $ratio2 or return;
if ($ratio1 eq $ratio2) {
$ratio1;
} else {
my $ratio = _nearest_ratio($horizontal / $vertical, 0.2);
join(' or ', $ratio, $ratio eq $ratio1 ? $ratio2 : $ratio1);
}
}
}
sub _edid_from_lines {
my (@l) = @_;
my $edid_str = join('', map { /\s+([0-9a-f]{32})$/ && $1 } @l);
if (length($edid_str) % (2 * 128) != 0 || length($edid_str) == 0) {
return ();
}
pack("C*", map { hex($_) } $edid_str =~ /(..)/g);
}
sub find_edid_in_string {
my ($input) = @_;
my @edids;
while ($input =~ /(?:EDID_DATA|: EDID \(in hex\)|EDID):\n((.*\n){8})/g) {
push @edids, _edid_from_lines(split '\n', $1);
}
if (!@edids) {
@edids = _edid_from_lines(split '\n', $input);
}
@edids;
}
sub _define { defined $_[0] ? $_[0] : 0 }
sub _sqr { $_[0] * $_[0] }
sub _round { int($_[0] + 0.5) }
sub _group_by2 {
my @l;
for (my $i = 0; $i < @_; $i += 2) {
push @l, [ $_[$i], $_[$i+1] ];
}
@l;
}
1;
__END__
=head1 NAME
Parse::EDID - Extended display identification data (EDID) parser
=head1 DESCRIPTION
This module provides some function to parse Extended Display Identification
Data binary data structures.
=head1 FUNCTIONS
=head2 parse_edid($raw_edid)
Parse the raw binary edid data, as a string, and return a corresponding data
structure, as an hashref.
=head2 check_parsed_edid($edid)
Check the data structure, and return an error message if anything is wrong, an
empty string otherwise.
=head2 find_edid_in_string($string)
Extract raw binary edid data from another tool text output, such as xrandr
--prop.
=head1 LICENSE
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
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