cache: use render job times to synchronize cache

Ensure old inaccurate jobs are never prioritized over current jobs.

app/task/cache/cache.cpp

@@ -65,14 +65,14 @@ QFuture<void> CacheTask::DownloadFrame(FramePtr frame, const QByteArray &hash)
 void CacheTask::FrameDownloaded(const QByteArray &hash, const std::list<rational> &times)
 {
   foreach (const rational& t, times) {
-    viewer()->video_frame_cache()->SetHash(t, hash);
+    viewer()->video_frame_cache()->SetHash(t, hash, job_time());
   }
 }
 
 void CacheTask::AudioDownloaded(const TimeRange &range, SampleBufferPtr samples)
 {
   if (samples) {
-    viewer()->audio_playback_cache()->WritePCM(range, samples);
+    viewer()->audio_playback_cache()->WritePCM(range, samples, job_time());
   } else {
     viewer()->audio_playback_cache()->WriteSilence(range);
   }

app/task/export/export.cpp

@@ -177,7 +177,7 @@ void ExportTask::AudioDownloaded(const TimeRange &range, SampleBufferPtr samples
     adjusted_range -= params_.custom_range().in();
   }
 
-  audio_data_.WritePCM(adjusted_range, samples);
+  audio_data_.WritePCM(adjusted_range, samples, job_time());
 }
 
 OLIVE_NAMESPACE_EXIT

app/task/render/render.cpp

@@ -29,6 +29,8 @@ RenderTask::RenderTask(ViewerOutput* viewer, const VideoRenderingParams &vparams
   video_params_(vparams),
   audio_params_(aparams)
 {
+  job_time_ = QDateTime::currentMSecsSinceEpoch();
+
   // FIXME: This makes a full copy of the node graph every time it starts, there must be a better
   //        way.
   backend_.SetViewerNode(viewer_);

app/task/render/render.h

@@ -63,6 +63,11 @@ protected:
 
   void SetAnchorPoint(const rational& r);
 
+  const qint64& job_time() const
+  {
+    return job_time_;
+  }
+
 private:
   ViewerOutput* viewer_;
 
@@ -74,6 +79,8 @@ private:
 
   OpenGLBackend backend_;
 
+  qint64 job_time_;
+
 };
 
 OLIVE_NAMESPACE_EXIT