VideoNode.hpp

#pragma once
 
#include <Gfx/Graph/Node.hpp>
extern "C" {
#include <libavformat/avformat.h>
}
#include <ossia/detail/mutex.hpp>
 
#include <atomic>
 
namespace Video
{
struct VideoInterface;
class ExternalInput;
}
namespace score::gfx
{
class VideoNodeRenderer;
class DirectVideoNodeRenderer;
class VideoNode;
 
struct RefcountedFrame
{
  AVFrame* frame{};
  std::atomic_int use_count{};
};
 
struct VideoFrameShare
{
  VideoFrameShare();
  ~VideoFrameShare();
 
  std::shared_ptr<RefcountedFrame> currentFrame() const noexcept;
  void updateCurrentFrame(AVFrame* frame);
  void releaseFramesToFree();
  void releaseAllFrames();
 
  std::shared_ptr<Video::VideoInterface> m_decoder;
 
  mutable std::mutex m_frameLock{};
  std::shared_ptr<RefcountedFrame> m_currentFrame TS_GUARDED_BY(m_frameLock);
 
  int64_t m_currentFrameIdx{};
 
  std::vector<AVFrame*> m_framesToFree;
  std::vector<std::shared_ptr<RefcountedFrame>> m_framesInFlight;
};
 
struct VideoFrameReader : VideoFrameShare
{
  VideoFrameReader();
  ~VideoFrameReader();
 
  static AVFrame* nextFrame(
      const VideoNode& node, Video::VideoInterface& decoder,
      std::vector<AVFrame*>& framesToFree, AVFrame*& nextFrame);
 
  bool mustReadVideoFrame(const VideoNode& node);
  void readNextFrame(VideoNode& node);
 
  void pause(bool p);
 
private:
  QElapsedTimer m_timer;
  AVFrame* m_nextFrame{};
  double m_lastFrameTime{};
  double m_lastPlaybackTime{-1.};
  bool m_readFrame{};
};
 
class SCORE_PLUGIN_GFX_EXPORT VideoNodeBase : public ProcessNode
{
public:
  void setScaleMode(score::gfx::ScaleMode s);
  void setPlaybackMode(score::gfx::PlaybackMode s);
 
  friend VideoNodeRenderer;
  friend DirectVideoNodeRenderer;
 
protected:
  QString m_filter;
  score::gfx::ScaleMode m_scaleMode{};
  score::gfx::PlaybackMode m_playbackMode{};
};
 
class SCORE_PLUGIN_GFX_EXPORT VideoNode : public VideoNodeBase
{
public:
  VideoNode(
      std::shared_ptr<Video::VideoInterface> dec, std::optional<double> nativeTempo);
 
  virtual ~VideoNode();
 
  score::gfx::NodeRenderer* createRenderer(RenderList& r) const noexcept override;
 
  void seeked();
 
  void process(Message&& msg) override;
  void update() override;
 
  VideoFrameReader reader;
 
  void pause(bool);
 
private:
  friend VideoFrameReader;
  friend VideoNodeRenderer;
 
  std::optional<double> m_nativeTempo;
  Timings m_lastToken{};
  QElapsedTimer m_timer;
  std::atomic_bool m_pause{};
};
}
 
namespace score::gfx
{
class SCORE_PLUGIN_GFX_EXPORT CameraNode : public VideoNodeBase
{
public:
  explicit CameraNode(std::shared_ptr<Video::ExternalInput> dec, QString filter = {});
 
  virtual ~CameraNode();
 
  score::gfx::NodeRenderer* createRenderer(RenderList& r) const noexcept override;
 
  void process(Message&& msg) override;
  void renderedNodesChanged() override;
 
  VideoFrameShare reader;
 
  std::atomic_bool must_stop{};
 
private:
  friend VideoNodeRenderer;
};
 
}