started new cache

app/render/previewautocacher.cpp

@@ -887,4 +887,31 @@ void PreviewAutoCacher::SetViewerNode(ViewerOutput *viewer_node)
   }
 }
 
+PreviewAutoCacher::PlaybackDevice::PlaybackDevice(PreviewAutoCacher *cacher, QObject *parent) :
+  cacher_(cacher),
+  current_time_(0)
+{
+  audio_params_ = viewer()->GetAudioParams();
+}
+
+bool PreviewAutoCacher::PlaybackDevice::seek(qint64 pos)
+{
+  // Call super function
+  if (QIODevice::seek(pos)) {
+    // Convert bytes to time
+    current_time_ = audio_params_.bytes_to_time(pos);
+
+    return true;
+  }
+
+  return false;
+}
+
+qint64 PreviewAutoCacher::PlaybackDevice::size() const
+{
+  rational audio_length = cacher_->copied_viewer_node_->GetAudioLength();
+
+  return audio_params_.time_to_bytes(audio_length);
+}
+
 }

app/render/previewautocacher.h

@@ -9,6 +9,7 @@
 #include "node/node.h"
 #include "node/output/viewer/viewer.h"
 #include "node/project/project.h"
+#include "render/audioparams.h"
 #include "render/renderjobtracker.h"
 #include "threading/threadticketwatcher.h"
 
@@ -71,6 +72,37 @@ public:
   void CancelVideoTasks(bool and_wait_for_them_to_finish = false);
   void CancelAudioTasks(bool and_wait_for_them_to_finish = false);
 
+  class PlaybackDevice : public QIODevice
+  {
+  public:
+    PlaybackDevice(PreviewAutoCacher *cacher, QObject *parent = nullptr);
+
+    virtual ~PlaybackDevice() override;
+
+    virtual bool isSequential() const override;
+
+    virtual bool seek(qint64 pos) override;
+
+    virtual qint64 size() const override;
+
+    virtual qint64 readData(char *data, qint64 maxSize) override;
+
+    virtual qint64 writeData(const char *, qint64) override;
+
+    ViewerOutput *viewer() const
+    {
+      return cacher_->copied_viewer_node_;
+    }
+
+  private:
+    PreviewAutoCacher *cacher_;
+
+    rational current_time_;
+
+    AudioParams audio_params_;
+
+  };
+
 private:
   void TryRender();