ExampleTransformer.h

#include "api/frame_transformer_interface.h"

namespace webrtc {

class ExampleTransformer : public webrtc::FrameTransformerInterface {
 public:
  virtual void RegisterTransformedFrameSinkCallback(
      rtc::scoped_refptr<webrtc::TransformedFrameCallback>,
      uint32_t ssrc) override;
  virtual void UnregisterTransformedFrameSinkCallback(uint32_t ssrc) override;
  virtual void Transform(
      std::unique_ptr<webrtc::TransformableFrameInterface> frame) override;

 private:
  mutable webrtc::Mutex mutex_;
  rtc::scoped_refptr<webrtc::TransformedFrameCallback> sink_callback_;
}

}  // namespace webrtc