EDID parser library
Add a support library to parse EDID that will be used by platform plugins. In order to tell the screen manufacturer from the identifier, the parsers reads /usr/share/hwdata/pnp.ids or, if it's missing, uses a lookup table previously generated from that file with a Python script. Change-Id: Ie021eb68be91f06dc0da54445f88e3533f78d23e Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
This commit is contained in:
Pier Luigi Fiorini
parent
06713ded60
commit
5f7ab88055
13
src/platformsupport/edid/edid.pro
Normal file
13
src/platformsupport/edid/edid.pro
Normal file
@ -0,0 +1,13 @@
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TARGET = QtEdidSupport
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MODULE = edid_support
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QT = core-private
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CONFIG += static internal_module
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DEFINES += QT_NO_CAST_FROM_ASCII
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PRECOMPILED_HEADER = ../../corelib/global/qt_pch.h
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HEADERS += qedidparser_p.h
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SOURCES += qedidparser.cpp
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load(qt_module)
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177
src/platformsupport/edid/qedidparser.cpp
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177
src/platformsupport/edid/qedidparser.cpp
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@ -0,0 +1,177 @@
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/****************************************************************************
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**
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** Copyright (C) 2017 Pier Luigi Fiorini <pierluigi.fiorini@gmail.com>
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the plugins of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QtCore/QFile>
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#include "qedidparser_p.h"
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#include "qedidvendortable_p.h"
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#define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
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#define EDID_DESCRIPTOR_ALPHANUMERIC_STRING 0xfe
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#define EDID_DESCRIPTOR_PRODUCT_NAME 0xfc
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#define EDID_DESCRIPTOR_SERIAL_NUMBER 0xff
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#define EDID_OFFSET_DATA_BLOCKS 0x36
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#define EDID_OFFSET_LAST_BLOCK 0x6c
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#define EDID_OFFSET_PNP_ID 0x08
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#define EDID_OFFSET_SERIAL 0x0c
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#define EDID_PHYSICAL_WIDTH 0x15
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#define EDID_OFFSET_PHYSICAL_HEIGHT 0x16
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QT_BEGIN_NAMESPACE
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QEdidParser::QEdidParser()
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{
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// Cache vendors list from pnp.ids
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const QString fileName = QLatin1String("/usr/share/hwdata/pnp.ids");
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if (QFile::exists(fileName)) {
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QFile file(fileName);
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if (file.open(QFile::ReadOnly)) {
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while (!file.atEnd()) {
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QString line = QString::fromUtf8(file.readLine()).trimmed();
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if (line.startsWith(QLatin1Char('#')))
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continue;
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QStringList parts = line.split(QLatin1Char('\t'));
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if (parts.count() > 1) {
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QString pnpId = parts.at(0);
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parts.removeFirst();
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m_vendorCache[pnpId] = parts.join(QLatin1Char(' '));
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}
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}
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file.close();
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}
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}
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}
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bool QEdidParser::parse(const QByteArray &blob)
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{
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const quint8 *data = reinterpret_cast<const quint8 *>(blob.constData());
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const size_t length = blob.length();
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// Verify header
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if (length < 128)
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return false;
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if (data[0] != 0x00 || data[1] != 0xff)
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return false;
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/* Decode the PNP ID from three 5 bit words packed into 2 bytes
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* /--08--\/--09--\
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* 7654321076543210
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* |\---/\---/\---/
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* R C1 C2 C3 */
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char id[3];
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id[0] = 'A' + ((data[EDID_OFFSET_PNP_ID] & 0x7c) / 4) - 1;
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id[1] = 'A' + ((data[EDID_OFFSET_PNP_ID] & 0x3) * 8) + ((data[EDID_OFFSET_PNP_ID + 1] & 0xe0) / 32) - 1;
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id[2] = 'A' + (data[EDID_OFFSET_PNP_ID + 1] & 0x1f) - 1;
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identifier = QString::fromLatin1(id, 3);
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// Clear manufacturer
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manufacturer = QString();
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// Serial number, will be overwritten by an ASCII descriptor
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// when and if it will be found
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quint32 serial = data[EDID_OFFSET_SERIAL]
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+ (data[EDID_OFFSET_SERIAL + 1] << 8)
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+ (data[EDID_OFFSET_SERIAL + 2] << 16)
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+ (data[EDID_OFFSET_SERIAL + 3] << 24);
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if (serial > 0)
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serialNumber = QString::number(serial);
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else
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serialNumber = QString();
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// Parse EDID data
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for (int i = 0; i < 5; ++i) {
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const uint offset = EDID_OFFSET_DATA_BLOCKS + i * 18;
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if (data[offset] != 0 || data[offset + 1] != 0 || data[offset + 2] != 0)
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continue;
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if (data[offset + 3] == EDID_DESCRIPTOR_PRODUCT_NAME)
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model = parseEdidString(&data[offset + 5]);
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else if (data[offset + 3] == EDID_DESCRIPTOR_ALPHANUMERIC_STRING)
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identifier = parseEdidString(&data[offset + 5]);
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else if (data[offset + 3] == EDID_DESCRIPTOR_SERIAL_NUMBER)
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serialNumber = parseEdidString(&data[offset + 5]);
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}
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// Try to use cache first because it is potentially more updated
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if (m_vendorCache.contains(identifier)) {
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manufacturer = m_vendorCache[identifier];
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} else {
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// Find the manufacturer from the vendor lookup table
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for (size_t i = 0; i < ARRAY_LENGTH(q_edidVendorTable); i++) {
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if (strcmp(q_edidVendorTable[i].id, identifier.toLatin1().constData()) == 0) {
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manufacturer = QString::fromUtf8(q_edidVendorTable[i].name);
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break;
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}
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}
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}
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// If we don't know the manufacturer, fallback to PNP ID
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if (manufacturer.isEmpty())
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manufacturer = identifier;
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// Physical size
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physicalSize = QSizeF(data[EDID_PHYSICAL_WIDTH], data[EDID_OFFSET_PHYSICAL_HEIGHT]) * 10;
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return true;
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}
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QString QEdidParser::parseEdidString(const quint8 *data)
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{
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QByteArray buffer(reinterpret_cast<const char *>(data), 12);
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// Erase carriage return and line feed
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buffer = buffer.replace('\r', '\0').replace('\n', '\0');
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// Replace non-printable characters with dash
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for (int i = 0; i < buffer.count(); ++i) {
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if (buffer[i] < '\040' && buffer[i] > '\176')
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buffer[i] = '-';
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}
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return QString::fromLatin1(buffer.trimmed());
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}
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QT_END_NAMESPACE
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78
src/platformsupport/edid/qedidparser_p.h
Normal file
78
src/platformsupport/edid/qedidparser_p.h
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@ -0,0 +1,78 @@
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/****************************************************************************
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**
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** Copyright (C) 2017 Pier Luigi Fiorini <pierluigi.fiorini@gmail.com>
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the plugins of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef QEDIDPARSER_P_H
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#define QEDIDPARSER_P_H
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#include <QtCore/QSize>
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#include <QtCore/QMap>
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//
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// W A R N I N G
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// -------------
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//
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// This file is not part of the Qt API. It exists purely as an
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// implementation detail. This header file may change from version to
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// version without notice, or even be removed.
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//
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QT_BEGIN_NAMESPACE
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class QEdidParser
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{
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public:
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QEdidParser();
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bool parse(const QByteArray &blob);
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QString identifier;
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QString manufacturer;
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QString model;
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QString serialNumber;
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QSizeF physicalSize;
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private:
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QMap<QString, QString> m_vendorCache;
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QString parseEdidString(const quint8 *data);
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};
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QT_END_NAMESPACE
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#endif // QEDIDPARSER_P_H
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2296
src/platformsupport/edid/qedidvendortable_p.h
Normal file
2296
src/platformsupport/edid/qedidvendortable_p.h
Normal file
File diff suppressed because it is too large
Load Diff
@ -2,6 +2,7 @@ TEMPLATE = subdirs
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QT_FOR_CONFIG += gui-private
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SUBDIRS = \
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edid \
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eventdispatchers \
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devicediscovery \
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fbconvenience \
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@ -26,6 +26,7 @@
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"QtFbSupport" => "$basedir/src/platformsupport/fbconvenience",
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"QtGlxSupport" => "$basedir/src/platformsupport/glxconvenience",
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"QtKmsSupport" => "$basedir/src/platformsupport/kmsconvenience",
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"QtEdidSupport" => "$basedir/src/platformsupport/edid",
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"QtVulkanSupport" => "$basedir/src/platformsupport/vkconvenience",
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"QtPlatformHeaders" => "$basedir/src/platformheaders",
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"QtANGLE/KHR" => "!$basedir/src/3rdparty/angle/include/KHR",
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123
util/edid/qedidvendortable.py
Executable file
123
util/edid/qedidvendortable.py
Executable file
@ -0,0 +1,123 @@
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#!/usr/bin/env python3
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#############################################################################
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##
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## Copyright (C) 2017 Pier Luigi Fiorini <pierluigi.fiorini@gmail.com>
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## Contact: https://www.qt.io/licensing/
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##
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## This file is part of the plugins of the Qt Toolkit.
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##
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## $QT_BEGIN_LICENSE:GPL-EXCEPT$
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## Commercial License Usage
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## Licensees holding valid commercial Qt licenses may use this file in
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## accordance with the commercial license agreement provided with the
|
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## Software or, alternatively, in accordance with the terms contained in
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## a written agreement between you and The Qt Company. For licensing terms
|
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## and conditions see https://www.qt.io/terms-conditions. For further
|
||||
## information use the contact form at https://www.qt.io/contact-us.
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##
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## GNU General Public License Usage
|
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## Alternatively, this file may be used under the terms of the GNU
|
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## General Public License version 3 as published by the Free Software
|
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## Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
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## included in the packaging of this file. Please review the following
|
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## information to ensure the GNU General Public License requirements will
|
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## be met: https://www.gnu.org/licenses/gpl-3.0.html.
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##
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## $QT_END_LICENSE$
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##
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#############################################################################
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import urllib.request
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url = 'https://git.fedorahosted.org/cgit/hwdata.git/plain/pnp.ids'
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copyright = """/****************************************************************************
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**
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** Copyright (C) 2017 Pier Luigi Fiorini <pierluigi.fiorini@gmail.com>
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the plugins of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
|
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** Licensees holding valid commercial Qt licenses may use this file in
|
||||
** accordance with the commercial license agreement provided with the
|
||||
** Software or, alternatively, in accordance with the terms contained in
|
||||
** a written agreement between you and The Qt Company. For licensing terms
|
||||
** and conditions see https://www.qt.io/terms-conditions. For further
|
||||
** information use the contact form at https://www.qt.io/contact-us.
|
||||
**
|
||||
** GNU Lesser General Public License Usage
|
||||
** Alternatively, this file may be used under the terms of the GNU Lesser
|
||||
** General Public License version 3 as published by the Free Software
|
||||
** Foundation and appearing in the file LICENSE.LGPL3 included in the
|
||||
** packaging of this file. Please review the following information to
|
||||
** ensure the GNU Lesser General Public License version 3 requirements
|
||||
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
|
||||
**
|
||||
** GNU General Public License Usage
|
||||
** Alternatively, this file may be used under the terms of the GNU
|
||||
** General Public License version 2.0 or (at your option) the GNU General
|
||||
** Public license version 3 or any later version approved by the KDE Free
|
||||
** Qt Foundation. The licenses are as published by the Free Software
|
||||
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
|
||||
** included in the packaging of this file. Please review the following
|
||||
** information to ensure the GNU General Public License requirements will
|
||||
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
|
||||
** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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"""
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notice = """/*
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* This lookup table was generated from {}
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*
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* Do not change directly this file, instead edit the
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* qtbase/util/edid/qedidvendortable.py script and regenerate this file.
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*/""".format(url)
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header = """
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#ifndef QEDIDVENDORTABLE_P_H
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#define QEDIDVENDORTABLE_P_H
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QT_BEGIN_NAMESPACE
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typedef struct VendorTable {
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const char id[4];
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const char name[%d];
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} VendorTable;
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static const struct VendorTable q_edidVendorTable[] = {"""
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footer = """};
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QT_END_NAMESPACE
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#endif // QEDIDVENDORTABLE_P_H"""
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vendors = {}
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max_vendor_length = 0
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response = urllib.request.urlopen(url)
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data = response.read().decode('utf-8')
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for line in data.split('\n'):
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l = line.split()
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if line.startswith('#'):
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continue
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elif len(l) == 0:
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continue
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else:
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pnp_id = l[0].upper()
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vendors[pnp_id] = ' '.join(l[1:])
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if len(vendors[pnp_id]) > max_vendor_length:
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max_vendor_length = len(vendors[pnp_id])
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print(copyright)
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print(notice)
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print(header % (max_vendor_length + 1))
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for pnp_id in vendors.keys():
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print(' { "%s", "%s" },' % (pnp_id, vendors[pnp_id]))
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print(footer)
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