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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd and/or its subsidiary(-ies).
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 https://www.qt.io/terms-conditions. For further
** information use the contact form at https://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 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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);
}
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