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/**
* Oshi (https://github.com/oshi/oshi)
*
* Copyright (c) 2010 - 2018 The Oshi Project Team
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Maintainers:
* dblock[at]dblock[dot]org
* widdis[at]gmail[dot]com
* enrico.bianchi[at]gmail[dot]com
*
* Contributors:
* https://github.com/oshi/oshi/graphs/contributors
*/
package oshi.util;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.Arrays;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* EDID parsing utility.
*
* @author widdis[at]gmail[dot]com
*/
public class EdidUtil {
private static final Logger LOG = LoggerFactory.getLogger(EdidUtil.class);
private EdidUtil() {
}
/**
* Gets the Manufacturer ID from (up to) 3 5-bit characters in bytes 8 and 9
*
* @param edid
* The EDID byte array
* @return The manufacturer ID
*/
public static String getManufacturerID(byte[] edid) {
// Bytes 8-9 are manufacturer ID in 3 5-bit characters.
String temp = String
.format("%8s%8s", Integer.toBinaryString(edid[8] & 0xFF), Integer.toBinaryString(edid[9] & 0xFF))
.replace(' ', '0');
LOG.debug("Manufacurer ID: {}", temp);
return String.format("%s%s%s", (char) (64 + Integer.parseInt(temp.substring(1, 6), 2)),
(char) (64 + Integer.parseInt(temp.substring(7, 11), 2)),
(char) (64 + Integer.parseInt(temp.substring(12, 16), 2))).replace("@", "");
}
/**
* Gets the Product ID, bytes 10 and 11
*
* @param edid
* The EDID byte array
* @return The product ID
*/
public static String getProductID(byte[] edid) {
// Bytes 10-11 are product ID expressed in hex characters
return Integer.toHexString(
ByteBuffer.wrap(Arrays.copyOfRange(edid, 10, 12)).order(ByteOrder.LITTLE_ENDIAN).getShort() & 0xffff);
}
/**
* Gets the Serial number, bytes 12-15
*
* @param edid
* The EDID byte array
* @return If all 4 bytes represent alphanumeric characters, a 4-character
* string, otherwise a hex string.
*/
public static String getSerialNo(byte[] edid) {
// Bytes 12-15 are Serial number (last 4 characters)
if (LOG.isDebugEnabled()) {
LOG.debug("Serial number: {}", Arrays.toString(Arrays.copyOfRange(edid, 12, 16)));
}
return String.format("%s%s%s%s", getAlphaNumericOrHex(edid[15]), getAlphaNumericOrHex(edid[14]),
getAlphaNumericOrHex(edid[13]), getAlphaNumericOrHex(edid[12]));
}
private static String getAlphaNumericOrHex(byte b) {
return Character.isLetterOrDigit((char) b) ? String.format("%s", (char) b) : String.format("%02X", b);
}
/**
* Return the week of year of manufacture
*
* @param edid
* The EDID byte array
* @return The week of year
*/
public static byte getWeek(byte[] edid) {
// Byte 16 is manufacture week
return edid[16];
}
/**
* Return the year of manufacture
*
* @param edid
* The EDID byte array
* @return The year of manufacture
*/
public static int getYear(byte[] edid) {
// Byte 17 is manufacture year-1990
byte temp = edid[17];
LOG.debug("Year-1990: {}", temp);
return temp + 1990;
}
/**
* Return the EDID version
*
* @param edid
* The EDID byte array
* @return The EDID version
*/
public static String getVersion(byte[] edid) {
// Bytes 18-19 are EDID version
return edid[18] + "." + edid[19];
}
/**
* Test if this EDID is a digital monitor based on byte 20
*
* @param edid
* The EDID byte array
* @return True if the EDID represents a digital monitor, false otherwise
*/
public static boolean isDigital(byte[] edid) {
// Byte 20 is Video input params
return 1 == (edid[20] & 0xff) >> 7;
}
/**
* Get monitor width in cm
*
* @param edid
* The EDID byte array
* @return Monitor width in cm
*/
public static int getHcm(byte[] edid) {
// Byte 21 is horizontal size in cm
return edid[21];
}
/**
* Get monitor height in cm
*
* @param edid
* The EDID byte array
* @return Monitor height in cm
*/
public static int getVcm(byte[] edid) {
// Byte 22 is vertical size in cm
return edid[22];
}
/**
* Get the VESA descriptors
*
* @param edid
* The EDID byte array
* @return A 2D array with four 18-byte elements representing VESA
* descriptors
*/
public static byte[][] getDescriptors(byte[] edid) {
byte[][] desc = new byte[4][18];
for (int i = 0; i < desc.length; i++) {
System.arraycopy(edid, 54 + 18 * i, desc[i], 0, 18);
}
return desc;
}
/**
* Get the VESA descriptor type
*
* @param desc
* An 18-byte VESA descriptor
* @return An integer representing the first four bytes of the VESA
* descriptor
*/
public static int getDescriptorType(byte[] desc) {
return ByteBuffer.wrap(Arrays.copyOfRange(desc, 0, 4)).getInt();
}
/**
* Parse a detailed timing descriptor
*
* @param desc
* An 18-byte VESA descriptor
* @return A string describing part of the detailed timing descriptor
*/
public static String getTimingDescriptor(byte[] desc) {
int clock = ByteBuffer.wrap(Arrays.copyOfRange(desc, 0, 2)).order(ByteOrder.LITTLE_ENDIAN).getShort() / 100;
int hActive = (desc[2] & 0xff) + ((desc[4] & 0xf0) << 4);
int vActive = (desc[5] & 0xff) + ((desc[7] & 0xf0) << 4);
return String.format("Clock %dMHz, Active Pixels %dx%d ", clock, hActive, vActive);
}
/**
* Parse descriptor range limits
*
* @param desc
* An 18-byte VESA descriptor
* @return A string describing some of the range limits
*/
public static String getDescriptorRangeLimits(byte[] desc) {
return String.format("Field Rate %d-%d Hz vertical, %d-%d Hz horizontal, Max clock: %d MHz", desc[5], desc[6],
desc[7], desc[8], desc[9] * 10);
}
/**
* Parse descriptor text
*
* @param desc
* An 18-byte VESA descriptor
* @return Plain text starting at the 4th byte
*/
public static String getDescriptorText(byte[] desc) {
return new String(Arrays.copyOfRange(desc, 4, 18)).trim();
}
/**
* Parse an EDID byte array into user-readable information
*
* @param edid
* An EDID byte array
* @return User-readable text represented by the EDID
*/
public static String toString(byte[] edid) {
StringBuilder sb = new StringBuilder();
sb.append(" Manuf. ID=").append(EdidUtil.getManufacturerID(edid)).append(", Product ID=")
.append(EdidUtil.getProductID(edid)).append(", ")
.append(EdidUtil.isDigital(edid) ? "Digital" : "Analog").append(", Serial=")
.append(EdidUtil.getSerialNo(edid)).append(", ManufDate=")
.append(EdidUtil.getWeek(edid) * 12 / 52 + 1 + "/").append(EdidUtil.getYear(edid)).append(", EDID v")
.append(EdidUtil.getVersion(edid));
int hSize = EdidUtil.getHcm(edid);
int vSize = EdidUtil.getVcm(edid);
sb.append(String.format("%n %d x %d cm (%.1f x %.1f in)", hSize, vSize, hSize / 2.54, vSize / 2.54));
byte[][] desc = EdidUtil.getDescriptors(edid);
for (byte[] b : desc) {
switch (EdidUtil.getDescriptorType(b)) {
case 0xff:
sb.append("\n Serial Number: ").append(EdidUtil.getDescriptorText(b));
break;
case 0xfe:
sb.append("\n Unspecified Text: ").append(EdidUtil.getDescriptorText(b));
break;
case 0xfd:
sb.append("\n Range Limits: ").append(EdidUtil.getDescriptorRangeLimits(b));
break;
case 0xfc:
sb.append("\n Monitor Name: ").append(EdidUtil.getDescriptorText(b));
break;
case 0xfb:
sb.append("\n White Point Data: ").append(ParseUtil.byteArrayToHexString(b));
break;
case 0xfa:
sb.append("\n Standard Timing ID: ").append(ParseUtil.byteArrayToHexString(b));
break;
default:
if (EdidUtil.getDescriptorType(b) <= 0x0f && EdidUtil.getDescriptorType(b) >= 0x00) {
sb.append("\n Manufacturer Data: ").append(ParseUtil.byteArrayToHexString(b));
} else {
sb.append("\n Preferred Timing: ").append(EdidUtil.getTimingDescriptor(b));
}
break;
}
}
return sb.toString();
}
}
