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| |
| #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 |
| |
| - (void)start; |
| - (void)stop; |
| - (void)displayLinkNotification:(CADisplayLink *)sender; |
| |
| @end |
| |
| @implementation DisplayLinkObserver |
| { |
| AVFDisplayLink *m_avfDisplayLink; |
| CADisplayLink *m_displayLink; |
| } |
| |
| - (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 = nullptr; |
| } |
| |
| [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(nullptr) |
| , 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 = nullptr; |
| } |
| } |
| |
| bool AVFDisplayLink::isValid() const |
| { |
| return m_displayLink != nullptr; |
| } |
| |
| 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); |
| } |