System: Switch to new capture file on video FPS change

src/core/gpu.cpp

@@ -2150,7 +2150,7 @@ bool GPU::RenderDisplay(GPUTexture* target, const GSVector4i display_rect, const
 bool GPU::SendDisplayToMediaCapture(MediaCapture* cap)
 {
   GPUTexture* target = cap->GetRenderTexture();
-  if (!target)
+  if (!target) [[unlikely]]
     return false;
 
   const bool apply_aspect_ratio =
@@ -2163,11 +2163,9 @@ bool GPU::SendDisplayToMediaCapture(MediaCapture* cap)
   // Not cleared by RenderDisplay().
   g_gpu_device->ClearRenderTarget(target, GPUDevice::DEFAULT_CLEAR_COLOR);
 
-  if (!RenderDisplay(target, display_rect, draw_rect, postfx))
+  if (!RenderDisplay(target, display_rect, draw_rect, postfx)) [[unlikely]]
     return false;
 
-  // TODO: Check for frame rate change
-
   return cap->DeliverVideoFrame(target);
 }
 

src/core/system.cpp

@@ -2023,10 +2023,26 @@ void System::FrameDone()
 
   // Kick off media capture early, might take a while.
   if (s_media_capture && s_media_capture->IsCapturingVideo()) [[unlikely]]
+  {
+    if (s_media_capture->GetVideoFPS() != GetThrottleFrequency()) [[unlikely]]
+    {
+      const std::string next_capture_path = s_media_capture->GetNextCapturePath();
+      INFO_LOG("Video frame rate changed, switching to new capture file {}", Path::GetFileName(next_capture_path));
+
+      const bool was_capturing_audio = s_media_capture->IsCapturingAudio();
+      StopMediaCapture();
+      if (StartMediaCapture(std::move(next_capture_path), true, was_capturing_audio) &&
+          !g_gpu->SendDisplayToMediaCapture(s_media_capture.get())) [[unlikely]]
+      {
+        StopMediaCapture();
+      }
+    }
+    else
     {
       if (!g_gpu->SendDisplayToMediaCapture(s_media_capture.get())) [[unlikely]]
         StopMediaCapture();
     }
+  }
 
   Common::Timer::Value current_time = Common::Timer::GetCurrentValue();
 
@@ -4991,7 +5007,7 @@ bool System::StartMediaCapture(std::string path, bool capture_video, bool captur
   u32 capture_height = g_settings.media_capture_video_height;
   const GPUTexture::Format capture_format =
     g_gpu_device->HasSurface() ? g_gpu_device->GetWindowFormat() : GPUTexture::Format::RGBA8;
-  const float fps = g_gpu->ComputeVerticalFrequency();
+  const float fps = System::GetThrottleFrequency();
   if (capture_video)
   {
     // TODO: This will be a mess with GPU thread.

src/util/media_capture.cpp

@@ -89,21 +89,23 @@ public:
   bool BeginCapture(float fps, float aspect, u32 width, u32 height, GPUTexture::Format texture_format, u32 sample_rate,
                     std::string path, bool capture_video, std::string_view video_codec, u32 video_bitrate,
                     std::string_view video_codec_args, bool capture_audio, std::string_view audio_codec,
-                    u32 audio_bitrate, std::string_view audio_codec_args, Error* error) override;
+                    u32 audio_bitrate, std::string_view audio_codec_args, Error* error) override final;
 
-  const std::string& GetPath() const override;
-  u32 GetVideoWidth() const override;
-  u32 GetVideoHeight() const override;
+  const std::string& GetPath() const override final;
+  std::string GetNextCapturePath() const override final;
+  u32 GetVideoWidth() const override final;
+  u32 GetVideoHeight() const override final;
+  float GetVideoFPS() const override final;
 
-  float GetCaptureThreadUsage() const override;
-  float GetCaptureThreadTime() const override;
-  void UpdateCaptureThreadUsage(double pct_divider, double time_divider) override;
+  float GetCaptureThreadUsage() const override final;
+  float GetCaptureThreadTime() const override final;
+  void UpdateCaptureThreadUsage(double pct_divider, double time_divider) override final;
 
-  GPUTexture* GetRenderTexture() override;
-  bool DeliverVideoFrame(GPUTexture* stex) override;
-  bool DeliverAudioFrames(const s16* frames, u32 num_frames) override;
-  bool EndCapture(Error* error) override;
-  void Flush() override;
+  GPUTexture* GetRenderTexture() override final;
+  bool DeliverVideoFrame(GPUTexture* stex) override final;
+  bool DeliverAudioFrames(const s16* frames, u32 num_frames) override final;
+  bool EndCapture(Error* error) override final;
+  void Flush() override final;
 
 protected:
   struct PendingFrame
@@ -147,9 +149,10 @@ protected:
   std::atomic_bool m_capturing{false};
   std::atomic_bool m_encoding_error{false};
 
+  GPUTexture::Format m_video_render_texture_format = GPUTexture::Format::Unknown;
   u32 m_video_width = 0;
   u32 m_video_height = 0;
-  GPUTexture::Format m_video_render_texture_format = GPUTexture::Format::Unknown;
+  float m_video_fps = 0;
   s64 m_next_video_pts = 0;
   std::unique_ptr<GPUTexture> m_render_texture;
 
@@ -185,17 +188,19 @@ bool MediaCaptureBase::BeginCapture(float fps, float aspect, u32 width, u32 heig
                                     std::string_view audio_codec, u32 audio_bitrate, std::string_view audio_codec_args,
                                     Error* error)
 {
+  m_video_render_texture_format = texture_format;
   m_video_width = width;
   m_video_height = height;
-  m_video_render_texture_format = texture_format;
+  m_video_fps = fps;
 
   if (path.empty())
   {
     Error::SetStringView(error, "No path specified.");
     return false;
   }
-  else if (fps == 0.0f || m_video_width == 0 || !Common::IsAlignedPow2(m_video_width, VIDEO_WIDTH_ALIGNMENT) ||
-           m_video_height == 0 || !Common::IsAlignedPow2(m_video_height, VIDEO_HEIGHT_ALIGNMENT))
+  else if (capture_video &&
+           (fps == 0.0f || m_video_width == 0 || !Common::IsAlignedPow2(m_video_width, VIDEO_WIDTH_ALIGNMENT) ||
+            m_video_height == 0 || !Common::IsAlignedPow2(m_video_height, VIDEO_HEIGHT_ALIGNMENT)))
   {
     Error::SetStringView(error, "Invalid video dimensions/rate.");
     return false;
@@ -506,6 +511,34 @@ const std::string& MediaCaptureBase::GetPath() const
   return m_path;
 }
 
+std::string MediaCaptureBase::GetNextCapturePath() const
+{
+  const std::string_view ext = Path::GetExtension(m_path);
+  std::string_view name = Path::GetFileTitle(m_path);
+
+  // Should end with a number.
+  u32 partnum = 2;
+  std::string_view::size_type pos = name.rfind("_part");
+  if (pos != std::string_view::npos)
+  {
+    std::string_view::size_type cpos = pos + 5;
+    for (; cpos < name.length(); cpos++)
+    {
+      if (name[cpos] < '0' || name[cpos] > '9')
+        break;
+    }
+    if (cpos == name.length())
+    {
+      // Has existing part number, so add to it.
+      partnum = StringUtil::FromChars<u32>(name.substr(pos + 5)).value_or(1) + 1;
+      name = name.substr(0, pos);
+    }
+  }
+
+  // If we haven't started a new file previously, add "_part2".
+  return Path::BuildRelativePath(m_path, fmt::format("{}_part{:03d}.{}", name, partnum, ext));
+}
+
 u32 MediaCaptureBase::GetVideoWidth() const
 {
   return m_video_width;
@@ -516,6 +549,11 @@ u32 MediaCaptureBase::GetVideoHeight() const
   return m_video_height;
 }
 
+float MediaCaptureBase::GetVideoFPS() const
+{
+  return m_video_fps;
+}
+
 float MediaCaptureBase::GetCaptureThreadUsage() const
 {
   return m_encoder_thread_usage;

src/util/media_capture.h

@@ -56,10 +56,12 @@ public:
 
   // TODO: make non-virtual?
   virtual const std::string& GetPath() const = 0;
+  virtual std::string GetNextCapturePath() const = 0;
   virtual bool IsCapturingAudio() const = 0;
   virtual bool IsCapturingVideo() const = 0;
   virtual u32 GetVideoWidth() const = 0;
   virtual u32 GetVideoHeight() const = 0;
+  virtual float GetVideoFPS() const = 0;
 
   /// Returns the elapsed time in seconds.
   virtual time_t GetElapsedTime() const = 0;