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php-edid-decode.php
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<?php
/*
* Copyright 2006-2009 Red Hat, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* on the rights to use, copy, modify, merge, publish, distribute, sub
* license, and/or sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/* Author: Adam Jackson <ajax@nwnk.net> */
/* PHP-port by: Ben Claar <ben.claar@gmail.com> */
class EdidDecode {
public $_output = true; // Whether to output anything
public $_debug = false; // Whether to output additional debug information
public $_hideserial = false; // Whether to output the serial number (allows tests to succeed)
public $result_str = ''; // A saved copy of the output
public $result = array(); // The decoded EDID
private $_detailed_block_index = 0;
private $_detailed_block_name; // Replaces the static vars in c version -- we need
private $_result_add_timing_detailed_index = 0; // this variable to be "static" per class instance
public $claims_one_point_oh = 0;
public $claims_one_point_two = 0;
public $claims_one_point_three = 0;
public $claims_one_point_four = 0;
public $nonconformant_digital_display = 0;
public $nonconformant_extension = 0;
public $did_detailed_timing = 0;
public $has_name_descriptor = 0;
public $name_descriptor_terminated = 0;
public $has_range_descriptor = 0;
public $has_preferred_timing = 0;
public $has_valid_checksum = 1;
public $has_valid_cvt = 1;
public $has_valid_dummy_block = 1;
public $has_valid_week = 0;
public $has_valid_year = 0;
public $has_valid_detailed_blocks = 0;
public $has_valid_extension_count = 0;
public $has_valid_descriptor_ordering = 1;
public $has_valid_descriptor_pad = 1;
public $has_valid_range_descriptor = 1;
public $has_valid_max_dotclock = 1;
public $manufacturer_name_well_formed = 0;
public $seen_non_detailed_descriptor = 0;
public $warning_excessive_dotclock_correction = 0;
public $warning_zero_preferred_refresh = 0;
public $conformant = 1;
public function manufacturer_name($x)
{
$name = chr(((ord($x[0]) & 0x7C) >> 2) + ord('@'));
$name .= chr(((ord($x[0]) & 0x03) << 3) + ((ord($x[1]) & 0xE0) >> 5) + ord('@'));
$name .= chr((ord($x[1]) & 0x1F) + ord('@'));
if ($this->isupper($name))
$this->manufacturer_name_well_formed = 1;
return $name;
}
public function detailed_cvt_descriptor($x, $first)
{
$empty = "\x00\x00\x00";
$names = array( "50", "60", "75", "85" );
$valid = 1;
$fifty = 0; $sixty = 0; $seventyfive = 0; $eightyfive = 0; $reduced = 0;
if (!$first && !$this->memcmp($x, $empty, 3))
return $valid;
$height = ord($x[0]);
$height |= (ord($x[1]) & 0xf0) << 4;
$height++;
$height *= 2;
switch (ord($x[1]) & 0x0c) {
case 0x00:
$width = ($height * 4) / 3; break;
case 0x04:
$width = ($height * 16) / 9; break;
case 0x08:
$width = ($height * 16) / 10; break;
case 0x0c:
$width = ($height * 15) / 9; break;
}
if (ord($x[1]) & 0x03) $valid = 0;
if (ord($x[2]) & 0x80) $valid = 0;
if (!(ord($x[2]) & 0x1f)) $valid = 0;
$fifty = (ord($x[2]) & 0x10);
$sixty = (ord($x[2]) & 0x08);
$seventyfive = (ord($x[2]) & 0x04);
$eightyfive = (ord($x[2]) & 0x02);
$reduced = (ord($x[2]) & 0x01);
if (!$valid) {
$this->myprintf(" (broken)\n");
} else {
$this->myprintf(" %dx%d @ ( %s%s%s%s%s) Hz (%s%s preferred)\n", $width, $height,
$fifty ? "50 " : "",
$sixty ? "60 " : "",
$seventyfive ? "75 " : "",
$eightyfive ? "85 " : "",
$reduced ? "60RB " : "",
$names[(ord($x[2]) & 0x60) >> 5],
(((ord($x[2]) & 0x60) == 0x20) && $reduced) ? "RB" : "");
}
return $valid;
}
/* 1 means valid data */
public function detailed_block($x, $in_extension)
{
$result = &$this->result; // Convenience var
$name = &$this->detailed_block_name; // Convenience var
$index = &$this->detailed_block_index; // Convenience var
if ($this->_debug) {
$this->myprintf("Hex of detail: ");
for ($i = 0; $i < 18; $i++) $this->myprintf("%02x", ord($x[$i]));
$this->myprintf("\n");
}
if (ord($x[0]) == 0 && ord($x[1]) == 0) {
/* Monitor descriptor block, not detailed timing descriptor. */
if (ord($x[2]) != 0) {
/* 1.3, 3.10.3 */
$this->myprintf("Monitor descriptor block has byte 2 nonzero (0x%02x)\n",
ord($x[2]));
$this->has_valid_descriptor_pad = 0;
}
if (ord($x[3]) != 0xfd && ord($x[4]) != 0x00) {
/* 1.3, 3.10.3 */
$this->myprintf("Monitor descriptor block has byte 4 nonzero (0x%02x)\n",
ord($x[4]));
$this->has_valid_descriptor_pad = 0;
}
$this->seen_non_detailed_descriptor = 1;
if (ord($x[3]) <= 0xF) {
/*
* in principle we can decode these, if we know what they are.
* 0x0f seems to be common in laptop panels.
* 0x0e is used by EPI: http://www.epi-standard.org/
*/
$this->myprintf("Manufacturer-specified data, tag %d\n", ord($x[3]));
return 1;
}
switch (ord($x[3])) {
case 0x10:
$this->myprintf("Dummy block\n");
for ($i = 5; $i < 18; $i++)
if (ord($x[$i]) != 0x00)
$this->has_valid_dummy_block = 0;
return 1;
case 0xF7:
/* TODO */
$this->myprintf("Established timings III\n");
return 1;
case 0xF8:
{
$valid_cvt = 1; /* just this block */
$this->myprintf("CVT 3-byte code descriptor:\n");
if (ord($x[5]) != 0x01) {
$this->has_valid_cvt = 0;
return 0;
}
for ($i = 0; $i < 4; $i++)
$valid_cvt &= $this->detailed_cvt_descriptor($x + 6 + (i * 3), ($i == 0));
$this->has_valid_cvt &= $valid_cvt;
return $valid_cvt;
}
case 0xF9:
/* TODO */
$this->myprintf("Color management data\n");
return 1;
case 0xFA:
/* TODO */
$this->myprintf("More standard timings\n");
return 1;
case 0xFB:
/* TODO */
$this->myprintf("Color point\n");
return 1;
case 0xFC:
/* XXX should check for spaces after the \n */
/* XXX check: terminated with 0x0A (\n), padded with 0x20 (space) */
$this->has_name_descriptor = 1;
if (strchr($name, "\n")) return 1;
$name = substr($x,5,13);
if (strpos($name,"\x0")!==false) {
$name = substr($name,0,strpos($name,"\x0"));
}
$this->result['name'] = rtrim($name);
if (strchr($name, "\n")) {
$this->name_descriptor_terminated = 1;
$this->myprintf("Monitor name: %s", $name);
}
return 1;
case 0xFD:
{
$h_max_offset = 0;
$h_min_offset = 0;
$v_max_offset = 0;
$v_min_offset = 0;
$is_cvt = 0;
$this->has_range_descriptor = 1;
/*
* XXX todo: implement feature flags, vtd blocks
* XXX check: ranges are well-formed; block termination if no vtd
*/
if ($this->claims_one_point_four) {
if (ord($x[4]) & 0x02) {
$v_max_offset = 255;
if (ord($x[4]) & 0x01) {
$v_min_offset = 255;
}
}
if (ord($x[4]) & 0x04) {
$h_max_offset = 255;
if (ord($x[4]) & 0x03) {
$h_min_offset = 255;
}
}
} else if (ord($x[4])) {
$this->has_valid_range_descriptor = 0;
}
/*
* despite the values, this is not a bitfield.
* XXX only 0x00 and 0x02 are legal for pre-1.4
*/
switch (ord($x[10])) {
case 0x00: /* default gtf */
break;
case 0x01: /* range limits only */
break;
case 0x02: /* secondary gtf curve */
break;
case 0x04: /* cvt */
$is_cvt = 1;
break;
default: /* invalid */
break;
}
if (ord($x[5]) + $v_min_offset > ord($x[6]) + $v_max_offset)
$this->has_valid_range_descriptor = 0;
if (ord($x[7]) + $h_min_offset > ord($x[8]) + $h_max_offset)
$this->has_valid_range_descriptor = 0;
$result['vertical-range'] = (ord($x[5]) + $v_min_offset) . '-' . (ord($x[6]) + $v_max_offset) . 'HZ';
$result['horizontal-range'] = (ord($x[7]) + $h_min_offset) . '-' . (ord($x[8]) + $h_max_offset) . 'kHz';
$this->myprintf("Monitor ranges: %s vertical, %s horizontal",
$result['vertical-range'], $result['horizontal-range']);
if (ord($x[9])) {
$result['max-dotclock'] = (ord($x[9]) * 10) . 'MHz';
$this->myprintf(", max dotclock %s\n", $result['max-dotclock']);
}
else {
if ($this->claims_one_point_four)
$this->has_valid_max_dotclock = 0;
$this->myprintf("\n");
}
if ($is_cvt) {
$max_h_pixels = 0;
$this->myprintf("CVT version %d.%d\n", ord($x[11]) & 0xf0 >> 4, ord($x[11]) & 0x0f);
if (ord($x[12]) & 0xfc) {
$raw_offset = (ord($x[12]) & 0xfc) >> 2;
$result['max-dotclock'] = (ord($x[9]) * 10) - ($raw_offset * 0.25);
$this->myprintf("Real max dotclock: %.2fMHz\n",
$result['max-dotclock']);
$result['max-dotclock'] .= 'MHz';
if ($raw_offset >= 40)
$this->warning_excessive_dotclock_correction = 1;
}
$max_h_pixels = ord($x[12]) & 0x03;
$max_h_pixels <<= 8;
$max_h_pixels |= ord($x[13]);
$max_h_pixels *= 8;
if ($max_h_pixels) {
$result['max-h-pixels'] = $max_h_pixels;
$this->myprintf("Max active pixels per line: %d\n", $max_h_pixels);
}
$result['supported-aspect-ratios'] = trim(
(ord($x[14]) & 0x80 ? " 4:3" : "") .
(ord($x[14]) & 0x40 ? " 16:9" : "") .
(ord($x[14]) & 0x20 ? " 16:10": "") .
(ord($x[14]) & 0x10 ? " 5:4" : "") .
(ord($x[14]) & 0x08 ? " 15:9" : ""));
$this->myprintf("Supported aspect ratios: %s\n", $result['supported-aspect-ratios']);
if (ord($x[14]) & 0x07)
$this->has_valid_range_descriptor = 0;
switch((ord($x[15]) & 0xe0) >> 5) {
case 0x00: $result['preferred-aspect-ratio'] = "4:3"; break;
case 0x01: $result['preferred-aspect-ratio'] = "16:9"; break;
case 0x02: $result['preferred-aspect-ratio'] = "16:10"; break;
case 0x03: $result['preferred-aspect-ratio'] = "5:4"; break;
case 0x04: $result['preferred-aspect-ratio'] = "15:9"; break;
default: $result['preferred-aspect-ratio'] = "(broken)"; break;
}
$this->myprintf("Preferred aspect ratio: %s\n", $result['preferred-aspect-ratio']);
if (ord($x[15]) & 0x04)
$this->myprintf("Supports CVT standard blanking\n");
if (ord($x[15]) & 0x10)
$this->myprintf("Supports CVT reduced blanking\n");
if (ord($x[15]) & 0x07)
$this->has_valid_range_descriptor = 0;
if (ord($x[16]) & 0xf0) {
$this->myprintf("Supported display scaling:\n");
if (ord($x[16]) & 0x80)
$this->myprintf(" Horizontal shrink\n");
if (ord($x[16]) & 0x40)
$this->myprintf(" Horizontal stretch\n");
if (ord($x[16]) & 0x20)
$this->myprintf(" Vertical shrink\n");
if (ord($x[16]) & 0x10)
$this->myprintf(" Vertical stretch\n");
}
if (ord($x[16]) & 0x0f)
$this->has_valid_range_descriptor = 0;
if (ord($x[17]))
$this->myprintf("Preferred vertical refresh: %d Hz\n", ord($x[17]));
else
$this->warning_zero_preferred_refresh = 1;
}
/*
* Slightly weird to return a global, but I've never seen any
* EDID block wth two range descriptors, so it's harmless.
*/
return $this->has_valid_range_descriptor;
}
case 0xFE:
/*
* TODO: Two of these in a row, in the third and fouth slots,
* seems to be specified by SPWG: http://www.spwg.org/
*/
/* XXX check: terminated with 0x0A (which is \n), padded with 0x20 (a space)*/
$x = substr($x,5);
$this->myprintf("ASCII string: %s", preg_replace("#^(.*?)\s.*#s",'$1',$x));
return 1;
case 0xFF:
/* XXX check: terminated with 0x0A (which is \n), padded with 0x20 (a space) */
$x = substr($x,5);
$result['serial_number'] = preg_replace("#^(.*?)\s.*#s",'$1',$x);
if (!$this->_hideserial) { // C code has a bug which shows garbage after serial, making our tests fail
$this->myprintf("Serial number: %s\n", $result['serial_number']);
}
return 1;
default:
$this->myprintf("Unknown monitor description type %d\n", ord($x[3]));
return 0;
}
}
if ($this->seen_non_detailed_descriptor && !$in_extension) {
$this->has_valid_descriptor_ordering = 0;
}
$this->did_detailed_timing = 1;
$ha = (ord($x[2]) + ((ord($x[4]) & 0xF0) << 4)); // Horizontal Addressable Video
$hbl = (ord($x[3]) + ((ord($x[4]) & 0x0F) << 8)); // Hor blanking
$hso = (ord($x[8]) + ((ord($x[11]) & 0xC0) << 2)); // Hor front porch
$hspw = (ord($x[9]) + ((ord($x[11]) & 0x30) << 4)); // Hor pulse width
$hborder = ord($x[15]);
$va = (ord($x[5]) + ((ord($x[7]) & 0xF0) << 4));
$vbl = (ord($x[6]) + ((ord($x[7]) & 0x0F) << 8));
$vso = ((ord($x[10]) >> 4) + ((ord($x[11]) & 0x0C) << 2));
$vspw = ((ord($x[10]) & 0x0F) + ((ord($x[11]) & 0x03) << 4));
$vborder = ord($x[16]);
switch ((ord($x[17]) & 0x18) >> 3) {
case 0x00:
$syncmethod = " analog composite";
break;
case 0x01:
$syncmethod = " bipolar analog composite";
break;
case 0x02:
$syncmethod = " digital composite";
break;
case 0x03:
$syncmethod = "";
break;
}
$pvsync = (ord($x[17]) & (1 << 2)) ? '+' : '-';
$phsync = (ord($x[17]) & (1 << 1)) ? '+' : '-';
$refresh = (ord($x[0]) + (ord($x[1]) << 8)) / 100.0;
$timing = $this->result_add_timing($ha,$va,$refresh,true);
$result['detailed-timings'][$timing] = array();
$thisTiming = &$result['detailed-timings'][$timing];
$thisTiming['sync_method'] = $syncmethod;
$thisTiming['x'] = $ha;
$thisTiming['y'] = $va;
$thisTiming['refresh'] = $refresh;
$thisTiming['image-size'] = (ord($x[12]) + ((ord($x[14]) & 0xF0) << 4)) . " mm x " .
(ord($x[13]) + ((ord($x[14]) & 0x0F) << 8)) . " mm";
$this->myprintf("Detailed mode: Clock %.3f MHz, %s\n" .
" %4d %4d %4d %4d hborder %d\n" .
" %4d %4d %4d %4d vborder %d\n" .
" %shsync %svsync%s%s\n",
$thisTiming['refresh'],
$thisTiming['image-size'],
$ha, $ha + $hso, $ha + $hso + $hspw, $ha + $hbl, $hborder,
$va, $va + $vso, $va + $vso + $vspw, $va + $vbl, $vborder,
$phsync, $pvsync, $syncmethod, (ord($x[17]) & 0x80) ? " interlaced" : ""
);
/* XXX flag decode */
$index++;
return 1;
}
public function do_checksum($x)
{
$this->myprintf("Checksum: 0x%x", ord($x[0x7f]));
{
$sum = 0;
for ($i = 0; $i < 128; $i++) {
$sum += ord($x[$i]);
if ($sum > 255) $sum -= 256; // emulate unsigned char $sum -- range is 0 to 255
// $this->myprintf("%03d: x[i]: %04d, sum: %04d\n",$i,ord($x[$i]),$sum);
}
if ($sum) {
$this->myprintf(" (should be 0x%x)", (ord($x[0x7f]) - $sum));
$this->has_valid_checksum = 0;
}
}
$this->myprintf("\n");
}
/* CEA extension */
public function cea_video_block($x)
{
$length = ord($x[0]) & 0x1f;
for ($i = 1; $i < $length; $i++)
$this->myprintf(" VIC %02d %s\n", ord($x[$i]) & 0x7f, ord($x[$i]) & 0x80 ? "(native)" : "");
}
public function cea_hdmi_block($x)
{
$length = ord($x[0]) & 0x1f;
$this->myprintf(" (HDMI)\n");
$this->myprintf(" Source physical address %d.%d.%d.%d\n", ord($x[4]) >> 4, ord($x[4]) & 0x0f,
ord($x[5]) >> 4, ord($x[5]) & 0x0f);
if ($length > 5) {
if (ord($x[6]) & 0x80)
$this->myprintf(" Supports_AI\n");
if (ord($x[6]) & 0x40)
$this->myprintf(" DC_48bit\n");
if (ord($x[6]) & 0x20)
$this->myprintf(" DC_36bit\n");
if (ord($x[6]) & 0x10)
$this->myprintf(" DC_30bit\n");
if (ord($x[6]) & 0x08)
$this->myprintf(" DC_Y444\n");
/* two reserved */
if (ord($x[6]) & 0x01)
$this->myprintf(" DVI_Dual\n");
}
if ($length > 6)
$this->myprintf(" Maximum TMDS clock: %dMHz\n", ord($x[7]) * 5);
/* latency info */
}
public function cea_block($x)
{
$oui;
switch ((ord($x[0]) & 0xe0) >> 5) {
case 0x01:
$this->myprintf(" Audio data block\n");
break;
case 0x02:
$this->myprintf(" Video data block\n");
$this->cea_video_block($x);
break;
case 0x03:
/* yes really, endianness lols */
$oui = (ord($x[3]) << 16) + (ord($x[2]) << 8) + ord($x[1]);
$this->myprintf(" Vendor-specific data block, OUI %06x", $oui);
if ($oui == 0x000c03)
$this->cea_hdmi_block($x);
else
$this->myprintf("\n");
break;
case 0x04:
$this->myprintf(" Speaker allocation data block\n");
break;
case 0x05:
$this->myprintf(" VESA DTC data block\n");
break;
case 0x07:
$this->myprintf(" Extended tag: ");
switch (ord($x[1])) {
case 0x00:
$this->myprintf("video capability data block\n");
break;
case 0x01:
$this->myprintf("vendor-specific video data block\n");
break;
case 0x02:
$this->myprintf("VESA video display device information data block\n");
break;
case 0x03:
$this->myprintf("VESA video data block\n");
break;
case 0x04:
$this->myprintf("HDMI video data block\n");
break;
case 0x05:
$this->myprintf("Colorimetry data block\n");
break;
case 0x10:
$this->myprintf("CEA miscellaneous audio fields\n");
break;
case 0x11:
$this->myprintf("Vendor-specific audio data block\n");
break;
case 0x12:
$this->myprintf("HDMI audio data block\n");
break;
default:
if (ord($x[1]) >= 6 && ord($x[1]) <= 15)
$this->myprintf("Reserved video block (%02x)\n", ord($x[1]));
else if (ord($x[1]) >= 19 && ord($x[1]) <= 31)
$this->myprintf("Reserved audio block (%02x)\n", ord($x[1]));
else
$this->myprintf("Unknown (%02x)\n", ord($x[1]));
break;
}
break;
default:
{
$tag = ($x & 0xe0) >> 5;
$length = $x & 0x1f;
$this->myprintf(" Unknown tag %d, length %d (raw %02x)\n", $tag, $length, $x);
break;
}
}
}
public function parse_cea($x)
{
$ret = 0;
$version = ord($x[1]);
$offset = ord($x[2]);
if ($version >= 1) do {
if ($version == 1 && ord($x[3]) != 0)
$ret = 1;
if ($offset < 4)
break;
if ($version < 3) {
$this->myprintf("%d 8-byte timing descriptors\n", ($offset - 4) / 8);
if ($offset - 4 > 0)
/* do stuff */ ;
} else if ($version == 3) {
$this->myprintf("%d bytes of CEA data\n", $offset - 4);
for ($i = 4; $i < $offset; $i += (ord($x[$i]) & 0x1f) + 1) {
$this->cea_block(substr($x,$i));
}
}
if ($version >= 2) {
if (ord($x[3]) & 0x80)
$this->myprintf("Underscans PC formats by default\n");
if (ord($x[3]) & 0x40)
$this->myprintf("Basic audio support\n");
if (ord($x[3]) & 0x20)
$this->myprintf("Supports YCbCr 4:4:4\n");
if (ord($x[3]) & 0x10)
$this->myprintf("Supports YCbCr 4:2:2\n");
$this->myprintf("%d native detailed modes\n", ord($x[3]) & 0x0f);
}
for ($i = $offset; $i + 18 < 127; $i += 18)
if (ord($x[$i]))
$this->detailed_block(substr($x,$i), 1);
} while (0);
$this->do_checksum($x);
return $ret;
}
/* generic extension code */
public function extension_version($x)
{
$this->myprintf("Extension version: %d\n", ord($x[1]));
}
public function parse_extension($x)
{
$conformant_extension = 0;
$this->myprintf("\n");
switch(ord($x[0])) {
case 0x02:
$this->myprintf("CEA extension block\n");
$this->extension_version($x);
$conformant_extension = $this->parse_cea($x);
break;
case 0x10: $this->myprintf("VTB extension block\n"); break;
case 0x40: $this->myprintf("DI extension block\n"); break;
case 0x50: $this->myprintf("LS extension block\n"); break;
case 0x60: $this->myprintf("DPVL extension block\n"); break;
case 0xF0: $this->myprintf("Block map\n"); break;
case 0xFF: $this->myprintf("Manufacturer-specific extension block\n");
default:
$this->myprintf("Unknown extension block\n");
break;
}
$this->myprintf("\n");
return $conformant_extension;
}
public $edid_lines = 0;
public function extract_edid($fd)
{
$state = 0;
$lines = 0;
$out_index = 0;
$ret = file_get_contents($fd);
return $ret; // good enough for now.
$start = strstr($ret, "EDID_DATA:");
if ($start === FALSE) {
$start = strstr($ret, "EDID:");
}
/* Look for xrandr --verbose output (8 lines of 16 hex bytes) */
if ($start !== FALSE) {
$indentation1 = " ";
$indentation2 = "\t\t";
for ($i = 0; $i < 8; $i++) {
/* Get the next start of the line of EDID hex. */
$s = strstr($start, $indentation = $indentation1);
if (!$s)
$s = strstr($start, $indentation = $indentation2);
if ($s == NULL) {
return NULL;
}
$start = $s + strlen($indentation);
$c = $start;
for ($j = 0; $j < 16; $j++) {
$buf;
/* Read a %02x from the log */
if (!isxdigit($c[0]) || !isxdigit($c[1])) {
return NULL;
}
$buf[0] = $c[0];
$buf[1] = $c[1];
$buf[2] = 0;
$out[$out_index++] = strtol($buf, NULL, 16);
$c += 2;
}
}
return $out;
}
/* wait, is this a log file? */
for ($i = 0; $i < 8; $i++) {
if (!isascii($ret[$i])) {
$this->edid_lines = $len / 16;
return $ret;
}
}
/* i think it is, let's go scanning */
if (!($start = strstr($ret, "EDID (in hex):")))
return $ret;
if (!($start = strstr($start, "(II)")))
return $ret;
for ($c = $start; $c; $c++) {
if ($state == 0) {
/* skip ahead to the : */
if (!($c = strstr($c, ": \t")))
break;
/* and find the first number */
while (!isxdigit($c[1]))
$c++;
$state = 1;
$lines++;
} else if ($state == 1) {
$buf = array();
/* Read a %02x from the log */
if (!isxdigit($c)) {
$state = 0;
continue;
}
$buf[0] = $c[0];
$buf[1] = $c[1];
$buf[2] = 0;
$out[$out_index++] = strtol($buf, NULL, 16);
$c++;
}
}
$this->edid_lines = $lines;
return $out;
}
public $established_timings = array(
/* 0x23 bit 7 - 0 */
array(720, 400, 70), // x, y, refresh;
array(720, 400, 88),
array(640, 480, 60),
array(640, 480, 67),
array(640, 480, 72),
array(640, 480, 75),
array(800, 600, 56),
array(800, 600, 60),
/* 0x24 bit 7 - 0 */
array(800, 600, 72),
array(800, 600, 75),
array(832, 624, 75),
array(1280, 768, 87),
array(1024, 768, 60),
array(1024, 768, 70),
array(1024, 768, 75),
array(1280, 1024, 75),
/* 0x25 bit 7 */
array(1152, 870, 75),
);
public function print_subsection($name, $edid, $start, $end)
{
$i;
$this->myprintf("%s:", $name);
for ($i = strlen($name); $i < 15; $i++)
$this->myprintf(" ");
for ($i = $start; $i <= $end; $i++)
$this->myprintf(" %02x", ord($edid[$i]));
$this->myprintf("\n");
}
public function dump_breakdown($edid)
{
$this->myprintf("Extracted contents:\n");
$this->print_subsection("header", $edid, 0, 7);
$this->print_subsection("serial number", $edid, 8, 17);
$this->print_subsection("version", $edid,18, 19);
$this->print_subsection("basic params", $edid, 20, 24);
$this->print_subsection("chroma info", $edid, 25, 34);
$this->print_subsection("established", $edid, 35, 37);
$this->print_subsection("standard", $edid, 38, 53);
$this->print_subsection("descriptor 1", $edid, 54, 71);
$this->print_subsection("descriptor 2", $edid, 72, 89);
$this->print_subsection("descriptor 3", $edid, 90, 107);
$this->print_subsection("descriptor 4", $edid, 108, 125);
$this->print_subsection("extensions", $edid, 126, 126);
$this->print_subsection("checksum", $edid, 127, 127);
$this->myprintf("\n");
}
public function main($input,$inputIsBinaryEDID=false)
{
$result = &$this->result; // Convenience var
if ($inputIsBinaryEDID) {
$edid = $input;
} else {
$edid = $this->extract_edid($input);
if (empty($edid)) {
$fh = fopen('php://stderr','w');
fwrite($fh,"edid extract failed\n");
fclose($fh);
return 1;
}
}
$this->dump_breakdown($edid);
if (empty($edid) || !$this->memcmp($edid, "\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00", 8)) {
$this->myprintf("No header found\n");
return false;
}
$result['manufacturer_name'] = $this->manufacturer_name(substr($edid,0x08));
$result['product_code'] = (ord($edid[0x0A]) + (ord($edid[0x0B]) << 8));
$result['serial_number_int'] = (ord($edid[0x0C]) + (ord($edid[0x0D]) << 8) +
(ord($edid[0x0E]) << 16) + (ord($edid[0x0F]) << 24));
$this->myprintf("Manufacturer: %s Model %x Serial Number %u\n",
$result['manufacturer_name'], $result['product_code'], $result['serial_number_int']);
/* XXX need manufacturer ID table */
$ptm = localtime(time(),true);
if (ord($edid[0x10]) < 55 || ord($edid[0x10]) == 0xff) {
$this->has_valid_week = 1;
if (ord($edid[0x11]) > 0x0f) {
if (ord($edid[0x10]) == 0xff) {
$this->has_valid_year = 1;
$result['manufacture_week'] = ord($edid[0x10]);
$result['manufacture_year'] = ord($edid[0x11]);
$result['manufacture_date'] = mktime(0,0,0,1, ord($edid[0x10])*7,ord($edid[0x11]));
$this->myprintf("Made week %d of model year %d\n",
$result['manufacture_week'], $result['manufacture_year']);
} else if (ord($edid[0x11]) + 90 <= $ptm['tm_year']) {
$this->has_valid_year = 1;
$result['manufacture_week'] = ord($edid[0x10]);
$result['manufacture_year'] = ord($edid[0x11]) + 1990;
$result['manufacture_date'] = mktime(0,0,0,1, ord($edid[0x10])*7,ord($edid[0x11]) + 1990);
$this->myprintf("Made week %d of %d\n",
$result['manufacture_week'], $result['manufacture_year']);
}
}
}
$result['version'] = ord($edid[0x12]) . '.' . ord($edid[0x13]);
$this->myprintf("EDID version: %s\n", $result['version']);
if (ord($edid[0x12]) == 1) {
if (ord($edid[0x13]) > 4) {
$this->myprintf("Claims > 1.4, assuming 1.4 conformance\n");
#ord($edid[0x13]) = 4;
}
switch (ord($edid[0x13])) {
case 4:
$this->claims_one_point_four = 1;
case 3:
$this->claims_one_point_three = 1;
case 2:
$this->claims_one_point_two = 1;
default:
break;
}
$this->claims_one_point_oh = 1;
}
/* display section */
if (ord($edid[0x14]) & 0x80) {
$result['analog'] = false;
$analog = 0;
$this->myprintf("Digital display\n");
if ($this->claims_one_point_four) {
$conformance_mask = 0;
if ((ord($edid[0x14]) & 0x70) == 0x00)
$this->myprintf("Color depth is undefined\n");
else if ((ord($edid[0x14]) & 0x70) == 0x70)
$this->nonconformant_digital_display = 1;
else {
$result['color-bit-depth'] = ((ord($edid[0x14]) & 0x70) >> 3) + 4;
$this->myprintf("%d bits per primary color channel\n",
$result['color-bit-depth']);
}
switch (ord($edid[0x14]) & 0x0f) {
case 0x00: $this->myprintf("Digital interface is not defined\n"); break;
case 0x01: $result['digital-interface'] = 'DVI'; break;
case 0x02: $result['digital-interface'] = 'HDMI-a'; break;
case 0x03: $result['digital-interface'] = 'HDMI-b'; break;
case 0x04: $result['digital-interface'] = 'MDDI'; break;
case 0x05: $result['digital-interface'] = 'DisplayPort'; break;
default: $this->nonconformant_digital_display = 1;
}
if (!empty($result['digital-interface']))
$this->myprintf($result['digital-interface'] . " interface\n");
} else if ($this->claims_one_point_two) {
$conformance_mask = 0x7E;
if (ord($edid[0x14]) & 0x01) {
$this->myprintf("DFP 1.x compatible TMDS\n");
}
} else $conformance_mask = 0x7F;
if (!$this->nonconformant_digital_display)
$this->nonconformant_digital_display = ord($edid[0x14]) & $conformance_mask;
} else {
$result['analog'] = true;
$analog = 1;
$voltage = (ord($edid[0x14]) & 0x60) >> 5;
$sync = (ord($edid[0x14]) & 0x0F);
$result['input-voltage-level'] =
$voltage == 3 ? "0.7/0.7" :
($voltage == 2 ? "1.0/0.4" :
($voltage == 1 ? "0.714/0.286" : "0.7/0.3"));
$this->myprintf("Analog display, Input voltage level: %s V\n",
$result['input-voltage-level']);
if ($this->claims_one_point_four) {
$result['video-setup'] = (ord($edid[0x14]) & 0x10) ?
'Blank-to-black setup/pedestal' : 'Blank level equals black level';
$this->myprintf($result['video-setup'] . "\n");
} else if (ord($edid[0x14]) & 0x10) {
/*
* XXX this is just the $x text. 1.3 says "if set, display expects
* a blank-to-black setup or pedestal per appropriate Signal
* Level Standard". Whatever _that_ means.
*/
$this->myprintf("Configurable signal levels\n");
}
$result['sync'] =
($sync & 0x08 ? "Separate " : "") .
($sync & 0x04 ? "Composite " : "") .
($sync & 0x02 ? "SyncOnGreen " : "") .
($sync & 0x01 ? "Serration " : "");
$this->myprintf("Sync: %s\n", $result['sync']);
}
if (ord($edid[0x15]) && ord($edid[0x16])) {
$result['max-image-size'] = ord($edid[0x15]) . ' cm x ' . ord($edid[0x16]) . ' cm';
$this->myprintf("Maximum image size: %s\n", $result['max-image-size']);
}
else if ($this->claims_one_point_four && (ord($edid[0x15]) || ord($edid[0x16]))) {
$result['aspect-orientation'] = ord($edid[0x15]) ? 'landscape' : 'portrait';
$result['aspect-ratio'] = ord($edid[0x15]) ?
100.0/(ord($edid[0x16]) + 99) : 100.0/(ord($edid[0x15]) + 99);
$this->myprintf("Aspect ratio is %f (%s)\n",
$result['aspect-ratio'],$result['aspect-orientation']);
} else {
/* Either or both can be zero for 1.3 and before */
$this->myprintf("Image size is variable\n");
}
if (ord($edid[0x17]) == 0xff) {
if ($this->claims_one_point_four)
$this->myprintf("Gamma is defined in an extension block\n");
else {
/* XXX Technically 1.3 doesn't say this... */
$result['gamma'] = 1.0;
$this->myprintf("Gamma: 1.0\n");
}
} else {
$result['gamma'] = ((ord($edid[0x17]) + 100.0) / 100.0);
$this->myprintf("Gamma: %.2f\n", $result['gamma']);
}
if (ord($edid[0x18]) & 0xE0) {
$result['dpms'] = ltrim(
(ord($edid[0x18]) & 0x80 ? " Standby" : '') .
(ord($edid[0x18]) & 0x40 ? " Suspend" : '') .
(ord($edid[0x18]) & 0x20 ? " Off" : ''));
$this->myprintf("DPMS levels: %s\n",$result['dpms']);
}
/* FIXME: this is from 1.4 spec, check earlier */
if ($analog) {
switch (ord($edid[0x18]) & 0x18) {
case 0x00: $result['color-type'] = "Monochrome or grayscale display"; break;
case 0x08: $result['color-type'] = "RGB color display"; break;
case 0x10: $result['color-type'] = "Non-RGB color display"; break;
case 0x18: $result['color-type'] = "Undefined display color type"; break;
}
if (!empty($result['color-type']))
$this->myprintf($result['color-type'] . "\n");