frc971/vision/foxglove_image_converter.h

#ifndef FRC971_VISION_FOXGLOVE_IMAGE_CONVERTER_H_
#define FRC971_VISION_FOXGLOVE_IMAGE_CONVERTER_H_
#include "external/com_github_foxglove_schemas/CompressedImage_generated.h"
#include "frc971/vision/vision_generated.h"
#include "aos/events/event_loop.h"

namespace frc971::vision {
// Empirically, from 2022 logs:
// PNG is an ~2x space savings relative to raw images.
// JPEG is an ~10x space savings relative to PNG.
// Both perform significantly better than attempting to perform in-browser
// conversion with a user-script in Foxglove Studio.
enum class ImageCompression { kJpeg, kPng };

flatbuffers::Offset<foxglove::CompressedImage> CompressImage(
    const CameraImage *raw_image, flatbuffers::FlatBufferBuilder *fbb,
    ImageCompression compression);

// This class provides a simple converter that will take an AOS CameraImage
// channel and output
class FoxgloveImageConverter {
 public:
  // Watches for frc971.vision.CameraImage messages on the input_channel and
  // sends foxglove.CompressedImage messages on the output_channel, using the
  // specified image compression algorithm.
  FoxgloveImageConverter(aos::EventLoop *event_loop,
                         std::string_view input_channel,
                         std::string_view output_channel,
                         ImageCompression compression);

 private:
  aos::EventLoop *event_loop_;
  aos::Sender<foxglove::CompressedImage> sender_;
};
}  // namespace frc971::vision
#endif  // FRC971_VISION_FOXGLOVE_IMAGE_CONVERTER_H_