Qt 6.x
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avfdisplaylink.mm
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1// Copyright (C) 2016 The Qt Company Ltd and/or its subsidiary(-ies).
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
3
4#include "avfdisplaylink_p.h"
5#include <QtCore/qcoreapplication.h>
6
7#ifdef QT_DEBUG_AVF
8#include <QtCore/qdebug.h>
9#endif
10
11#if defined(Q_OS_IOS) || defined(Q_OS_TVOS)
12#import <QuartzCore/CADisplayLink.h>
13#import <Foundation/NSRunLoop.h>
14#define _m_displayLink static_cast<DisplayLinkObserver*>(m_displayLink)
15#else
16#endif
17
18QT_USE_NAMESPACE
19
20#if defined(Q_OS_IOS) || defined(Q_OS_TVOS)
21@interface DisplayLinkObserver : NSObject
22
23- (void)start;
24- (void)stop;
25- (void)displayLinkNotification:(CADisplayLink *)sender;
26
27@end
28
29@implementation DisplayLinkObserver
30{
31 AVFDisplayLink *m_avfDisplayLink;
32 CADisplayLink *m_displayLink;
33}
34
35- (id)initWithAVFDisplayLink:(AVFDisplayLink *)link
36{
37 self = [super init];
38
39 if (self) {
40 m_avfDisplayLink = link;
41 m_displayLink = [[CADisplayLink displayLinkWithTarget:self selector:@selector(displayLinkNotification:)] retain];
42 }
43
44 return self;
45}
46
47- (void) dealloc
48{
49 if (m_displayLink) {
50 [m_displayLink release];
51 m_displayLink = nullptr;
52 }
53
54 [super dealloc];
55}
56
57- (void)start
58{
59 [m_displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
60}
61
62- (void)stop
63{
64 [m_displayLink removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
65}
66
67- (void)displayLinkNotification:(CADisplayLink *)sender
68{
69 Q_UNUSED(sender);
70 m_avfDisplayLink->displayLinkEvent(nullptr);
71}
72
73@end
74#else
75static CVReturn CVDisplayLinkCallback(CVDisplayLinkRef displayLink,
76 const CVTimeStamp *inNow,
77 const CVTimeStamp *inOutputTime,
78 CVOptionFlags flagsIn,
79 CVOptionFlags *flagsOut,
80 void *displayLinkContext)
81{
82 Q_UNUSED(displayLink);
83 Q_UNUSED(inNow);
84 Q_UNUSED(flagsIn);
85 Q_UNUSED(flagsOut);
86
87 AVFDisplayLink *link = (AVFDisplayLink *)displayLinkContext;
88
89 link->displayLinkEvent(inOutputTime);
90 return kCVReturnSuccess;
91}
92#endif
93
94AVFDisplayLink::AVFDisplayLink(QObject *parent)
95 : QObject(parent)
96 , m_displayLink(nullptr)
97 , m_pendingDisplayLinkEvent(false)
98 , m_isActive(false)
99{
100#if defined(Q_OS_IOS) || defined(Q_OS_TVOS)
101 m_displayLink = [[DisplayLinkObserver alloc] initWithAVFDisplayLink:this];
102#else
103 // create display link for the main display
104 CVDisplayLinkCreateWithCGDisplay(kCGDirectMainDisplay, &m_displayLink);
105 if (m_displayLink) {
106 // set the current display of a display link.
107 CVDisplayLinkSetCurrentCGDisplay(m_displayLink, kCGDirectMainDisplay);
108
109 // set the renderer output callback function
110 CVDisplayLinkSetOutputCallback(m_displayLink, &CVDisplayLinkCallback, this);
111 }
112#endif
113}
114
115AVFDisplayLink::~AVFDisplayLink()
116{
117#ifdef QT_DEBUG_AVF
118 qDebug() << Q_FUNC_INFO;
119#endif
120
121 if (m_displayLink) {
122 stop();
123#if defined(Q_OS_IOS) || defined(Q_OS_TVOS)
124 [_m_displayLink release];
125#else
126 CVDisplayLinkRelease(m_displayLink);
127#endif
128 m_displayLink = nullptr;
129 }
130}
131
132bool AVFDisplayLink::isValid() const
133{
134 return m_displayLink != nullptr;
135}
136
137bool AVFDisplayLink::isActive() const
138{
139 return m_isActive;
140}
141
142void AVFDisplayLink::start()
143{
144 if (m_displayLink && !m_isActive) {
145#if defined(Q_OS_IOS) || defined(Q_OS_TVOS)
146 [_m_displayLink start];
147#else
148 CVDisplayLinkStart(m_displayLink);
149#endif
150 m_isActive = true;
151 }
152}
153
154void AVFDisplayLink::stop()
155{
156 if (m_displayLink && m_isActive) {
157#if defined(Q_OS_IOS) || defined(Q_OS_TVOS)
158 [_m_displayLink stop];
159#else
160 CVDisplayLinkStop(m_displayLink);
161#endif
162 m_isActive = false;
163 }
164}
165
166void AVFDisplayLink::displayLinkEvent(const CVTimeStamp *ts)
167{
168 // This function is called from a
169 // thread != gui thread. So we post the event.
170 // But we need to make sure that we don't post faster
171 // than the event loop can eat:
172 m_displayLinkMutex.lock();
173 bool pending = m_pendingDisplayLinkEvent;
174 m_pendingDisplayLinkEvent = true;
175#if defined(Q_OS_IOS) || defined(Q_OS_TVOS)
176 Q_UNUSED(ts);
177 memset(&m_frameTimeStamp, 0, sizeof(CVTimeStamp));
178#else
179 m_frameTimeStamp = *ts;
180#endif
181 m_displayLinkMutex.unlock();
182
183 if (!pending)
184 qApp->postEvent(this, new QEvent(QEvent::User), Qt::HighEventPriority);
185}
186
187bool AVFDisplayLink::event(QEvent *event)
188{
189 switch (event->type()){
190 case QEvent::User: {
191 m_displayLinkMutex.lock();
192 m_pendingDisplayLinkEvent = false;
193 CVTimeStamp ts = m_frameTimeStamp;
194 m_displayLinkMutex.unlock();
195
196 Q_EMIT tick(ts);
197
198 return false;
199 }
200 break;
201 default:
202 break;
203 }
204 return QObject::event(event);
205}
206
207#include "moc_avfdisplaylink_p.cpp"
avfdisplaylink_p.h
QEvent
\inmodule QtCore
Definition qcoreevent.h:45
QMutex::unlock
void unlock() noexcept
Unlocks the mutex.
Definition qmutex.h:293
QMutex::lock
void lock() noexcept
Locks the mutex.
Definition qmutex.h:290
QObject
\inmodule QtCore
Definition qobject.h:90
QObject::event
virtual bool event(QEvent *event)
This virtual function receives events to an object and should return true if the event e was recogniz...
Definition qobject.cpp:1363
QT_USE_NAMESPACE
Definition avfmediaassetwriter.mm:18
Qt::HighEventPriority
@ HighEventPriority
Definition qnamespace.h:1558
language::self
QString self
Definition language.cpp:57
Q_FUNC_INFO
#define Q_FUNC_INFO
Definition qcompilerdetection.h:1060
qApp
#define qApp
Definition qcoreapplication.h:42
void
DBusConnection const char DBusError DBusBusType DBusError return DBusConnection DBusHandleMessageFunction void DBusFreeFunction return DBusConnection return DBusConnection return const char DBusError return DBusConnection DBusMessage dbus_uint32_t return DBusConnection dbus_bool_t DBusConnection DBusAddWatchFunction DBusRemoveWatchFunction DBusWatchToggledFunction void DBusFreeFunction return DBusConnection DBusDispatchStatusFunction void DBusFreeFunction DBusTimeout return DBusTimeout return DBusWatch return DBusWatch unsigned int return DBusError const DBusError return const DBusMessage return DBusMessage return DBusMessage return DBusMessage return DBusMessage return DBusMessage return DBusMessageIter int const void return DBusMessageIter DBusMessageIter return DBusMessageIter void DBusMessageIter void int return DBusMessage DBusMessageIter return DBusMessageIter return DBusMessageIter DBusMessageIter const char const char const char const char return DBusMessage return DBusMessage const char return DBusMessage dbus_bool_t return DBusMessage dbus_uint32_t return DBusMessage void
Definition qdbus_symbols_p.h:401
pending
DBusConnection const char DBusError DBusBusType DBusError return DBusConnection DBusHandleMessageFunction void DBusFreeFunction return DBusConnection return DBusConnection return const char DBusError return DBusConnection DBusMessage dbus_uint32_t return DBusConnection dbus_bool_t DBusConnection DBusAddWatchFunction DBusRemoveWatchFunction DBusWatchToggledFunction void DBusFreeFunction return DBusConnection DBusDispatchStatusFunction void DBusFreeFunction DBusTimeout return DBusTimeout return DBusWatch return DBusWatch unsigned int return DBusError const DBusError return const DBusMessage return DBusMessage return DBusMessage return DBusMessage return DBusMessage return DBusMessage return DBusMessageIter int const void return DBusMessageIter DBusMessageIter return DBusMessageIter void DBusMessageIter void int return DBusMessage DBusMessageIter return DBusMessageIter return DBusMessageIter DBusMessageIter const char const char const char const char return DBusMessage return DBusMessage const char return DBusMessage dbus_bool_t return DBusMessage dbus_uint32_t return DBusMessage return DBusPendingCall * pending
Definition qdbus_symbols_p.h:414
qDebug
#define qDebug
[1]
Definition qlogging.h:160
id
GLenum GLuint id
[7]
Definition qopengles2ext.h:151
start
GLuint start
Definition qopengles2ext.h:354
event
struct _cl_event * event
Definition qopenglext.h:2998
Q_EMIT
#define Q_EMIT
Definition qtmetamacros.h:47
Q_UNUSED
#define Q_UNUSED(x)
Definition qtpreprocessorsupport.h:20
nullptr
QObject::connect nullptr
Definition src_corelib_kernel_qobject.cpp:255
false
return false
Definition src_corelib_thread_qatomic.cpp:23
parent
IUIAutomationTreeWalker __RPC__deref_out_opt IUIAutomationElement ** parent
Definition uiaclientinterfaces_p.h:209