1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
/*
* WebApiConnection.cpp - implementation of WebApiConnection class
*
* Copyright (c) 2020-2025 Tobias Junghans <tobydox@veyon.io>
*
* This file is part of Veyon - https://veyon.io
*
* 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 2 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 (see COPYING); if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
*/
#include <QImageWriter>
#include <QTimer>
#include "ComputerControlInterface.h"
#include "WebApiConnection.h"
WebApiConnection::WebApiConnection( const QString& hostAddress ) :
m_controlInterface( ComputerControlInterface::Pointer::create( Computer( {}, hostAddress, hostAddress ) ) ),
m_idleTimer( new QTimer ),
m_lifetimeTimer( new QTimer )
{
}
WebApiConnection::~WebApiConnection()
{
m_framebufferEncoder.waitForFinished();
m_idleTimer->deleteLater();
m_lifetimeTimer->deleteLater();
m_controlInterface->stop();
}
QSize WebApiConnection::scaledFramebufferSize( int width, int height ) const
{
const auto framebufferSize = m_controlInterface->framebuffer().size();
QSize scaledSize{};
if( width > 0 && height > 0 )
{
scaledSize = { width, height };
}
else if( width > 0 )
{
scaledSize = framebufferSize.scaled( width, framebufferSize.height(), Qt::KeepAspectRatio );
}
else if( height > 0 )
{
scaledSize = framebufferSize.scaled( framebufferSize.width(), height, Qt::KeepAspectRatio );
}
return scaledSize;
}
QByteArray WebApiConnection::encodedFramebufferData( QSize size, const QByteArray& format, int compression, int quality )
{
if( m_lastFramebufferRequestTimer.isValid() )
{
m_lastFramebufferRequestInterval = ( m_lastFramebufferRequestInterval + m_lastFramebufferRequestTimer.restart() ) / 2;
}
else
{
m_lastFramebufferRequestTimer.start();
}
m_framebufferEncoder.waitForFinished();
if( format != m_imageFormat ||
compression != m_imageCompression ||
quality != m_imageQuality ||
size != m_imageSize ||
m_framebufferEncoder.isCanceled() ||
m_framebufferEncoder.result().expired() )
{
m_imageFormat = format;
m_imageCompression = compression;
m_imageQuality = quality;
m_imageSize = size;
runFramebufferEncoder();
m_framebufferEncoder.waitForFinished();
}
const auto result = m_framebufferEncoder.result();
m_encodingError = result.errorString;
const auto preencodeInterval = m_lastFramebufferRequestInterval -
m_framebufferEncodingTime * 125 / 100;
if( preencodeInterval >= MinimumPreencodeInterval )
{
QTimer::singleShot( preencodeInterval,
m_controlInterface.data(), [this]() {
lock();
runFramebufferEncoder();
unlock();
} );
}
else
{
m_framebufferEncoder = {};
}
return result.imageData;
}
void WebApiConnection::runFramebufferEncoder()
{
m_framebufferEncoder = QtConcurrent::run( [this]() {
QElapsedTimer encodingTimer;
encodingTimer.start();
EncodingResult result;
QBuffer dataBuffer( &result.imageData );
dataBuffer.open( QBuffer::WriteOnly );
QImageWriter imageWriter( &dataBuffer, m_imageFormat );
if( m_imageCompression > 0 )
{
static constexpr auto QtPngCompressionLevelFactor = 11;
imageWriter.setCompression( m_imageCompression * QtPngCompressionLevelFactor );
}
if( m_imageQuality > 0 )
{
imageWriter.setQuality( m_imageQuality );
}
if( m_imageSize != m_controlInterface->scaledFramebufferSize() )
{
m_controlInterface->setScaledFramebufferSize(m_imageSize);
}
const auto writeResult = imageWriter.write(
m_imageSize.isEmpty() ?
controlInterface()->framebuffer() :
controlInterface()->scaledFramebuffer() );
dataBuffer.close();
if( writeResult == false )
{
result.imageData = {};
result.errorString = imageWriter.errorString();
}
m_framebufferEncodingTime = ( m_framebufferEncodingTime + encodingTimer.elapsed() ) / 2;
return result;
} );
}
|
