xbmc/windowing/ios/VideoSyncIos.cpp

   1 /*
   2  *  Copyright (C) 2015-2018 Team Kodi
   3  *  This file is part of Kodi - https://kodi.tv
   4  *
   5  *  SPDX-License-Identifier: GPL-2.0-or-later
   6  *  See LICENSES/README.md for more information.
   7  */
   8
   9 #include "VideoSyncIos.h"
  10
  11 #include "cores/VideoPlayer/VideoReferenceClock.h"
  12 #include "utils/MathUtils.h"
  13 #include "utils/TimeUtils.h"
  14 #include "utils/log.h"
  15 #include "windowing/GraphicContext.h"
  16 #include "windowing/ios/WinSystemIOS.h"
  17
  18 bool CVideoSyncIos::Setup()
  19 {
  20   CLog::Log(LOGDEBUG, "CVideoSyncIos::{} setting up OSX", __FUNCTION__);
  21
  22   //init the vblank timestamp
  23   m_LastVBlankTime = CurrentHostCounter();
  24   m_abortEvent.Reset();
  25
  26   bool setupOk = InitDisplayLink();
  27   if (setupOk)
  28   {
  29     m_winSystem.Register(this);
  30   }
  31
  32   return setupOk;
  33 }
  34
  35 void CVideoSyncIos::Run(CEvent& stopEvent)
  36 {
  37   //because cocoa has a vblank callback, we just keep sleeping until we're asked to stop the thread
  38   XbmcThreads::CEventGroup waitGroup{&stopEvent, &m_abortEvent};
  39   waitGroup.wait();
  40 }
  41
  42 void CVideoSyncIos::Cleanup()
  43 {
  44   CLog::Log(LOGDEBUG, "CVideoSyncIos::{} cleaning up OSX", __FUNCTION__);
  45   DeinitDisplayLink();
  46   m_winSystem.Unregister(this);
  47 }
  48
  49 float CVideoSyncIos::GetFps()
  50 {
  51   m_fps = CServiceBroker::GetWinSystem()->GetGfxContext().GetFPS();
  52   CLog::Log(LOGDEBUG, "CVideoSyncIos::{} Detected refreshrate: {:f} hertz", __FUNCTION__, m_fps);
  53   return m_fps;
  54 }
  55
  56 void CVideoSyncIos::OnResetDisplay()
  57 {
  58   m_abortEvent.Set();
  59 }
  60
  61 void CVideoSyncIos::IosVblankHandler()
  62 {
  63   int           NrVBlanks;
  64   double        VBlankTime;
  65   int64_t       nowtime = CurrentHostCounter();
  66
  67   //calculate how many vblanks happened
  68   VBlankTime = (double)(nowtime - m_LastVBlankTime) / (double)CurrentHostFrequency();
  69   NrVBlanks = MathUtils::round_int(VBlankTime * static_cast<double>(m_fps));
  70
  71   //save the timestamp of this vblank so we can calculate how many happened next time
  72   m_LastVBlankTime = nowtime;
  73
  74   //update the vblank timestamp, update the clock and send a signal that we got a vblank
  75   m_refClock->UpdateClock(NrVBlanks, nowtime);
  76 }
  77
  78 bool CVideoSyncIos::InitDisplayLink()
  79 {
  80   bool ret = true;
  81   CLog::Log(LOGDEBUG, "CVideoSyncIos: setting up displaylink");
  82   if (!m_winSystem.InitDisplayLink(this))
  83   {
  84     CLog::Log(LOGDEBUG, "CVideoSyncIos: InitDisplayLink failed");
  85     ret = false;
  86   }
  87   return ret;
  88 }
  89
  90 void CVideoSyncIos::DeinitDisplayLink()
  91 {
  92   m_winSystem.DeinitDisplayLink();
  93 }
  94