Add live packet plotting and packet rate stats

capture_file_writer.h

@@ -0,0 +1,49 @@
+#pragma once
+
+#include <cstddef>
+#include <string>
+#include <vector>
+
+struct CapturePacket {
+    std::size_t packet_index = 0;
+    std::vector<double> ch1;
+    std::vector<double> ch2;
+};
+
+class CaptureFileWriter {
+public:
+    CaptureFileWriter(std::string csv_path,
+                      std::string svg_path,
+                      std::string live_html_path,
+                      std::string live_json_path);
+
+    void write(const std::vector<CapturePacket>& packets,
+               double frame_freq_hz,
+               double nominal_range_v) const;
+
+    void initialize_live_plot() const;
+
+    void update_live_plot(const CapturePacket& packet,
+                          std::size_t packets_seen,
+                          double packets_per_second,
+                          double frame_freq_hz,
+                          const std::string& close_reason,
+                          std::size_t zeroed_samples,
+                          std::size_t stored_samples) const;
+
+    const std::string& live_html_path() const;
+    const std::string& live_json_path() const;
+
+private:
+    void write_csv(const std::vector<CapturePacket>& packets,
+                   double frame_freq_hz) const;
+
+    void write_svg(const std::vector<CapturePacket>& packets,
+                   double frame_freq_hz,
+                   double nominal_range_v) const;
+
+    std::string csv_path_;
+    std::string svg_path_;
+    std::string live_html_path_;
+    std::string live_json_path_;
+};