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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qwindowsimagecapture_p.h"
#include "qwindowsmediadevicesession_p.h"
#include "qwindowsmediacapture_p.h"
#include <private/qmediastoragelocation_p.h>
#include <QtConcurrent/qtconcurrentrun.h>
#include <QtGui/qimagewriter.h>
QT_BEGIN_NAMESPACE
QWindowsImageCapture::QWindowsImageCapture(QImageCapture *parent)
: QPlatformImageCapture(parent)
{
}
QWindowsImageCapture::~QWindowsImageCapture() = default;
bool QWindowsImageCapture::isReadyForCapture() const
{
if (!m_mediaDeviceSession)
return false;
return !m_capturing && m_mediaDeviceSession->isActive() && !m_mediaDeviceSession->activeCamera().isNull();
}
int QWindowsImageCapture::capture(const QString &fileName)
{
auto ext = writerFormat(m_settings.format());
auto path = QMediaStorageLocation::generateFileName(fileName, QStandardPaths::PicturesLocation, ext);
return doCapture(path);
}
int QWindowsImageCapture::captureToBuffer()
{
return doCapture(QString());
}
int QWindowsImageCapture::doCapture(const QString &fileName)
{
if (!isReadyForCapture())
return -1;
m_fileName = fileName;
m_capturing = true;
return m_captureId;
}
QImageEncoderSettings QWindowsImageCapture::imageSettings() const
{
return m_settings;
}
void QWindowsImageCapture::setImageSettings(const QImageEncoderSettings &settings)
{
m_settings = settings;
}
void QWindowsImageCapture::setCaptureSession(QPlatformMediaCaptureSession *session)
{
QWindowsMediaCaptureService *captureService = static_cast<QWindowsMediaCaptureService *>(session);
if (m_captureService == captureService)
return;
auto readyForCapture = isReadyForCapture();
if (m_mediaDeviceSession)
disconnect(m_mediaDeviceSession, nullptr, this, nullptr);
m_captureService = captureService;
if (!m_captureService) {
if (readyForCapture)
emit readyForCaptureChanged(false);
m_mediaDeviceSession = nullptr;
return;
}
m_mediaDeviceSession = m_captureService->session();
Q_ASSERT(m_mediaDeviceSession);
if (isReadyForCapture() != readyForCapture)
emit readyForCaptureChanged(isReadyForCapture());
connect(m_mediaDeviceSession, &QWindowsMediaDeviceSession::readyForCaptureChanged,
this, &QWindowsImageCapture::readyForCaptureChanged);
connect(m_mediaDeviceSession, &QWindowsMediaDeviceSession::videoFrameChanged,
this, &QWindowsImageCapture::handleVideoFrameChanged);
}
void QWindowsImageCapture::handleVideoFrameChanged(const QVideoFrame &frame)
{
if (m_capturing) {
QImage image = frame.toImage();
QSize size = m_settings.resolution();
if (size.isValid() && image.size() != size) {
image = image.scaled(size, Qt::KeepAspectRatioByExpanding);
if (image.size() != size) {
int xoff = (image.size().width() - size.width()) / 2;
int yoff = (image.size().height() - size.height()) / 2;
image = image.copy(xoff, yoff, size.width(), size.height());
}
}
emit imageExposed(m_captureId);
emit imageAvailable(m_captureId, frame);
emit imageCaptured(m_captureId, image);
QMediaMetaData metaData = this->metaData();
metaData.insert(QMediaMetaData::Date, QDateTime::currentDateTime());
metaData.insert(QMediaMetaData::Resolution, size);
emit imageMetadataAvailable(m_captureId, metaData);
if (!m_fileName.isEmpty()) {
(void)QtConcurrent::run(&QWindowsImageCapture::saveImage, this,
m_captureId, m_fileName, image, metaData, m_settings);
}
++m_captureId;
m_capturing = false;
}
}
void QWindowsImageCapture::saveImage(int captureId, const QString &fileName,
const QImage &image, const QMediaMetaData &metaData,
const QImageEncoderSettings &settings)
{
QImageWriter imageWriter;
imageWriter.setFileName(fileName);
QString format = writerFormat(settings.format());
imageWriter.setFormat(format.toUtf8());
int quality = writerQuality(format, settings.quality());
if (quality > -1)
imageWriter.setQuality(quality);
for (auto key : metaData.keys())
imageWriter.setText(QMediaMetaData::metaDataKeyToString(key),
metaData.stringValue(key));
imageWriter.write(image);
QMetaObject::invokeMethod(this, "imageSaved", Qt::QueuedConnection,
Q_ARG(int, captureId), Q_ARG(QString, fileName));
}
QString QWindowsImageCapture::writerFormat(QImageCapture::FileFormat reqFormat)
{
QString format;
switch (reqFormat) {
case QImageCapture::FileFormat::JPEG:
format = QLatin1String("jpg");
break;
case QImageCapture::FileFormat::PNG:
format = QLatin1String("png");
break;
case QImageCapture::FileFormat::WebP:
format = QLatin1String("webp");
break;
case QImageCapture::FileFormat::Tiff:
format = QLatin1String("tiff");
break;
default:
format = QLatin1String("jpg");
}
auto supported = QImageWriter::supportedImageFormats();
for (const auto &f : supported)
if (format.compare(QString::fromUtf8(f), Qt::CaseInsensitive) == 0)
return format;
return QLatin1String("jpg");
}
int QWindowsImageCapture::writerQuality(const QString &writerFormat,
QImageCapture::Quality quality)
{
if (writerFormat.compare(QLatin1String("jpg"), Qt::CaseInsensitive) == 0 ||
writerFormat.compare(QLatin1String("jpeg"), Qt::CaseInsensitive) == 0) {
switch (quality) {
case QImageCapture::Quality::VeryLowQuality:
return 10;
case QImageCapture::Quality::LowQuality:
return 30;
case QImageCapture::Quality::NormalQuality:
return 75;
case QImageCapture::Quality::HighQuality:
return 90;
case QImageCapture::Quality::VeryHighQuality:
return 98;
default:
return 75;
}
}
return -1;
}
QT_END_NAMESPACE
#include "moc_qwindowsimagecapture_p.cpp"
|
