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39
40#include "camerabinzoom.h"
41#include "camerabinsession.h"
42
43#define ZOOM_PROPERTY "zoom"
44#define MAX_ZOOM_PROPERTY "max-zoom"
45
46QT_BEGIN_NAMESPACE
47
48CameraBinZoom::CameraBinZoom(CameraBinSession *session)
49 : QCameraZoomControl(session)
50 , m_session(session)
51 , m_requestedOpticalZoom(1.0)
52 , m_requestedDigitalZoom(1.0)
53{
54 GstElement *camerabin = m_session->cameraBin();
55 g_signal_connect(G_OBJECT(camerabin), "notify::zoom", G_CALLBACK(updateZoom), this);
56 g_signal_connect(G_OBJECT(camerabin), "notify::max-zoom", G_CALLBACK(updateMaxZoom), this);
57}
58
59CameraBinZoom::~CameraBinZoom()
60{
61}
62
63qreal CameraBinZoom::maximumOpticalZoom() const
64{
65 return 1.0;
66}
67
68qreal CameraBinZoom::maximumDigitalZoom() const
69{
70 gfloat zoomFactor = 1.0;
71 g_object_get(GST_BIN(m_session->cameraBin()), MAX_ZOOM_PROPERTY, &zoomFactor, NULL);
72 return zoomFactor;
73}
74
75qreal CameraBinZoom::requestedDigitalZoom() const
76{
77 return m_requestedDigitalZoom;
78}
79
80qreal CameraBinZoom::requestedOpticalZoom() const
81{
82 return m_requestedOpticalZoom;
83}
84
85qreal CameraBinZoom::currentOpticalZoom() const
86{
87 return 1.0;
88}
89
90qreal CameraBinZoom::currentDigitalZoom() const
91{
92 gfloat zoomFactor = 1.0;
93 g_object_get(GST_BIN(m_session->cameraBin()), ZOOM_PROPERTY, &zoomFactor, NULL);
94 return zoomFactor;
95}
96
97void CameraBinZoom::zoomTo(qreal optical, qreal digital)
98{
99 qreal oldDigitalZoom = currentDigitalZoom();
100
101 if (m_requestedDigitalZoom != digital) {
102 m_requestedDigitalZoom = digital;
103 emit requestedDigitalZoomChanged(digitalZoom: digital);
104 }
105
106 if (m_requestedOpticalZoom != optical) {
107 m_requestedOpticalZoom = optical;
108 emit requestedOpticalZoomChanged(opticalZoom: optical);
109 }
110
111 digital = qBound(min: qreal(1.0), val: digital, max: maximumDigitalZoom());
112 g_object_set(GST_BIN(m_session->cameraBin()), ZOOM_PROPERTY, digital, NULL);
113
114 qreal newDigitalZoom = currentDigitalZoom();
115 if (!qFuzzyCompare(p1: oldDigitalZoom, p2: newDigitalZoom))
116 emit currentDigitalZoomChanged(digitalZoom: digital);
117}
118
119void CameraBinZoom::updateZoom(GObject *o, GParamSpec *p, gpointer d)
120{
121 Q_UNUSED(p);
122
123 gfloat zoomFactor = 1.0;
124 g_object_get(object: o, ZOOM_PROPERTY, &zoomFactor, NULL);
125
126 CameraBinZoom *zoom = reinterpret_cast<CameraBinZoom *>(d);
127
128 QMetaObject::invokeMethod(obj: zoom, member: "currentDigitalZoomChanged",
129 type: Qt::QueuedConnection,
130 Q_ARG(qreal, zoomFactor));
131}
132
133void CameraBinZoom::updateMaxZoom(GObject *o, GParamSpec *p, gpointer d)
134{
135 Q_UNUSED(p);
136
137 gfloat zoomFactor = 1.0;
138 g_object_get(object: o, MAX_ZOOM_PROPERTY, &zoomFactor, NULL);
139
140 CameraBinZoom *zoom = reinterpret_cast<CameraBinZoom *>(d);
141
142 QMetaObject::invokeMethod(obj: zoom, member: "maximumDigitalZoomChanged",
143 type: Qt::QueuedConnection,
144 Q_ARG(qreal, zoomFactor));
145}
146
147QT_END_NAMESPACE
148

source code of qtmultimedia/src/plugins/gstreamer/camerabin/camerabinzoom.cpp