VideoCommon: Don't round the refresh rate

We now provide a double to the FPS counter and exact values
to FIFO recording and frame dumping.

Source/Core/Core/FifoPlayer/FifoPlayer.cpp

@@ -242,7 +242,9 @@ FifoPlayer& FifoPlayer::GetInstance()
 void FifoPlayer::WriteFrame(const FifoFrameInfo& frame, const AnalyzedFrameInfo& info)
 {
   // Core timing information
-  m_CyclesPerFrame = SystemTimers::GetTicksPerSecond() / VideoInterface::GetTargetRefreshRate();
+  m_CyclesPerFrame = static_cast<u64>(SystemTimers::GetTicksPerSecond()) *
+                     VideoInterface::GetTargetRefreshRateDenominator() /
+                     VideoInterface::GetTargetRefreshRateNumerator();
   m_ElapsedCycles = 0;
   m_FrameFifoSize = static_cast<u32>(frame.fifoData.size());
 

Source/Core/Core/HW/VideoInterface.cpp

@@ -60,7 +60,9 @@ static UVIBorderBlankRegister m_BorderHBlank;
 // 0xcc002076 - 0xcc00207f is full of 0x00FF: unknown
 // 0xcc002080 - 0xcc002100 even more unknown
 
-static u32 s_target_refresh_rate = 0;
+static double s_target_refresh_rate = 0;
+static u32 s_target_refresh_rate_numerator = 0;
+static u32 s_target_refresh_rate_denominator = 1;
 
 static constexpr std::array<u32, 2> s_clock_freqs{{
     27000000,
@@ -102,14 +104,11 @@ void DoState(PointerWrap& p)
   p.Do(m_DTVStatus);
   p.Do(m_FBWidth);
   p.Do(m_BorderHBlank);
-  p.Do(s_target_refresh_rate);
   p.Do(s_ticks_last_line_start);
   p.Do(s_half_line_count);
   p.Do(s_half_line_of_next_si_poll);
-  p.Do(s_even_field_first_hl);
-  p.Do(s_odd_field_first_hl);
-  p.Do(s_even_field_last_hl);
-  p.Do(s_odd_field_last_hl);
+
+  UpdateParameters();
 }
 
 // Executed after Init, before game boot
@@ -698,15 +697,27 @@ void UpdateParameters()
   s_even_field_first_hl = equ_hl + m_VBlankTimingEven.PRB + GetHalfLinesPerOddField();
   s_even_field_last_hl = s_even_field_first_hl + acv_hl - 1;
 
-  s_target_refresh_rate = lround(2.0 * SystemTimers::GetTicksPerSecond() /
-                                 (GetTicksPerEvenField() + GetTicksPerOddField()));
+  s_target_refresh_rate_numerator = SystemTimers::GetTicksPerSecond() * 2;
+  s_target_refresh_rate_denominator = GetTicksPerEvenField() + GetTicksPerOddField();
+  s_target_refresh_rate =
+      static_cast<double>(s_target_refresh_rate_numerator) / s_target_refresh_rate_denominator;
 }
 
-u32 GetTargetRefreshRate()
+double GetTargetRefreshRate()
 {
   return s_target_refresh_rate;
 }
 
+u32 GetTargetRefreshRateNumerator()
+{
+  return s_target_refresh_rate_numerator;
+}
+
+u32 GetTargetRefreshRateDenominator()
+{
+  return s_target_refresh_rate_denominator;
+}
+
 u32 GetTicksPerSample()
 {
   return 2 * SystemTimers::GetTicksPerSecond() / s_clock_freqs[m_Clock];

Source/Core/Core/HW/VideoInterface.h

@@ -363,7 +363,10 @@ void UpdateInterrupts();
 // Change values pertaining to video mode
 void UpdateParameters();
 
-u32 GetTargetRefreshRate();
+double GetTargetRefreshRate();
+u32 GetTargetRefreshRateNumerator();
+u32 GetTargetRefreshRateDenominator();
+
 u32 GetTicksPerSample();
 u32 GetTicksPerHalfLine();
 u32 GetTicksPerField();

Source/Core/Core/State.cpp

@@ -74,7 +74,7 @@ static Common::Event g_compressAndDumpStateSyncEvent;
 static std::thread g_save_thread;
 
 // Don't forget to increase this after doing changes on the savestate system
-constexpr u32 STATE_VERSION = 120;  // Last changed in PR 8904
+constexpr u32 STATE_VERSION = 121;  // Last changed in PR 8988
 
 // Maps savestate versions to Dolphin versions.
 // Versions after 42 don't need to be added to this list,

Source/Core/VideoCommon/FrameDump.cpp

@@ -186,11 +186,11 @@ bool FrameDump::CreateVideoFile()
     s_codec_context->codec_tag = MKTAG('X', 'V', 'I', 'D');
 
   s_codec_context->codec_type = AVMEDIA_TYPE_VIDEO;
-  s_codec_context->bit_rate = g_Config.iBitrateKbps * 1000;
+  s_codec_context->bit_rate = static_cast<int64_t>(g_Config.iBitrateKbps) * 1000;
   s_codec_context->width = s_width;
   s_codec_context->height = s_height;
-  s_codec_context->time_base.num = 1;
-  s_codec_context->time_base.den = VideoInterface::GetTargetRefreshRate();
+  s_codec_context->time_base.num = VideoInterface::GetTargetRefreshRateDenominator();
+  s_codec_context->time_base.den = VideoInterface::GetTargetRefreshRateNumerator();
   s_codec_context->gop_size = 1;
   s_codec_context->level = 1;
   s_codec_context->pix_fmt = g_Config.bUseFFV1 ? AV_PIX_FMT_BGR0 : AV_PIX_FMT_YUV420P;