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
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd and/or its subsidiary(-ies).
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** 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 http://www.qt.io/terms-conditions. For further
** information use the contact form at http://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 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "avfdisplaylink.h"
#include <QtCore/qcoreapplication.h>
#ifdef QT_DEBUG_AVF
#include <QtCore/qdebug.h>
#endif
#if defined(Q_OS_IOS) || defined(Q_OS_TVOS)
#import <QuartzCore/CADisplayLink.h>
#import <Foundation/NSRunLoop.h>
#define _m_displayLink static_cast<DisplayLinkObserver*>(m_displayLink)
#else
#endif
QT_USE_NAMESPACE
#if defined(Q_OS_IOS) || defined(Q_OS_TVOS)
@interface DisplayLinkObserver : NSObject
{
AVFDisplayLink *m_avfDisplayLink;
CADisplayLink *m_displayLink;
}
- (void)start;
- (void)stop;
- (void)displayLinkNotification:(CADisplayLink *)sender;
@end
@implementation DisplayLinkObserver
- (id)initWithAVFDisplayLink:(AVFDisplayLink *)link
{
self = [super init];
if (self) {
m_avfDisplayLink = link;
m_displayLink = [[CADisplayLink displayLinkWithTarget:self selector:@selector(displayLinkNotification:)] retain];
}
return self;
}
- (void) dealloc
{
if (m_displayLink) {
[m_displayLink release];
m_displayLink = NULL;
}
[super dealloc];
}
- (void)start
{
[m_displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
}
- (void)stop
{
[m_displayLink removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
}
- (void)displayLinkNotification:(CADisplayLink *)sender
{
Q_UNUSED(sender);
m_avfDisplayLink->displayLinkEvent(nullptr);
}
@end
#else
static CVReturn CVDisplayLinkCallback(CVDisplayLinkRef displayLink,
const CVTimeStamp *inNow,
const CVTimeStamp *inOutputTime,
CVOptionFlags flagsIn,
CVOptionFlags *flagsOut,
void *displayLinkContext)
{
Q_UNUSED(displayLink);
Q_UNUSED(inNow);
Q_UNUSED(flagsIn);
Q_UNUSED(flagsOut);
AVFDisplayLink *link = (AVFDisplayLink *)displayLinkContext;
link->displayLinkEvent(inOutputTime);
return kCVReturnSuccess;
}
#endif
AVFDisplayLink::AVFDisplayLink(QObject *parent)
: QObject(parent)
, m_displayLink(0)
, m_pendingDisplayLinkEvent(false)
, m_isActive(false)
{
#if defined(Q_OS_IOS) || defined(Q_OS_TVOS)
m_displayLink = [[DisplayLinkObserver alloc] initWithAVFDisplayLink:this];
#else
// create display link for the main display
CVDisplayLinkCreateWithCGDisplay(kCGDirectMainDisplay, &m_displayLink);
if (m_displayLink) {
// set the current display of a display link.
CVDisplayLinkSetCurrentCGDisplay(m_displayLink, kCGDirectMainDisplay);
// set the renderer output callback function
CVDisplayLinkSetOutputCallback(m_displayLink, &CVDisplayLinkCallback, this);
}
#endif
}
AVFDisplayLink::~AVFDisplayLink()
{
#ifdef QT_DEBUG_AVF
qDebug() << Q_FUNC_INFO;
#endif
if (m_displayLink) {
stop();
#if defined(Q_OS_IOS) || defined(Q_OS_TVOS)
[_m_displayLink release];
#else
CVDisplayLinkRelease(m_displayLink);
#endif
m_displayLink = NULL;
}
}
bool AVFDisplayLink::isValid() const
{
return m_displayLink != 0;
}
bool AVFDisplayLink::isActive() const
{
return m_isActive;
}
void AVFDisplayLink::start()
{
if (m_displayLink && !m_isActive) {
#if defined(Q_OS_IOS) || defined(Q_OS_TVOS)
[_m_displayLink start];
#else
CVDisplayLinkStart(m_displayLink);
#endif
m_isActive = true;
}
}
void AVFDisplayLink::stop()
{
if (m_displayLink && m_isActive) {
#if defined(Q_OS_IOS) || defined(Q_OS_TVOS)
[_m_displayLink stop];
#else
CVDisplayLinkStop(m_displayLink);
#endif
m_isActive = false;
}
}
void AVFDisplayLink::displayLinkEvent(const CVTimeStamp *ts)
{
// This function is called from a
// thread != gui thread. So we post the event.
// But we need to make sure that we don't post faster
// than the event loop can eat:
m_displayLinkMutex.lock();
bool pending = m_pendingDisplayLinkEvent;
m_pendingDisplayLinkEvent = true;
#if defined(Q_OS_IOS) || defined(Q_OS_TVOS)
Q_UNUSED(ts);
memset(&m_frameTimeStamp, 0, sizeof(CVTimeStamp));
#else
m_frameTimeStamp = *ts;
#endif
m_displayLinkMutex.unlock();
if (!pending)
qApp->postEvent(this, new QEvent(QEvent::User), Qt::HighEventPriority);
}
bool AVFDisplayLink::event(QEvent *event)
{
switch (event->type()){
case QEvent::User: {
m_displayLinkMutex.lock();
m_pendingDisplayLinkEvent = false;
CVTimeStamp ts = m_frameTimeStamp;
m_displayLinkMutex.unlock();
Q_EMIT tick(ts);
return false;
}
break;
default:
break;
}
return QObject::event(event);
}
|
