Move everything into a separate futatabi/ subdir, for the upcoming merge with Futatabi.

[nageru] / nageru / print_latency.h

diff --git a/nageru/print_latency.h b/nageru/print_latency.h
new file mode 100644 (file)
index 0000000..d80ac88
--- /dev/null
+++ b/nageru/print_latency.h
@@ -0,0 +1,32 @@
+#ifndef _PRINT_LATENCY_H
+#define _PRINT_LATENCY_H 1
+
+// A small utility function to print the latency between two end points
+// (typically when the frame was received from the video card, and some
+// point when the frame is ready to be output in some form).
+
+#include <chrono>
+#include <string>
+#include <vector>
+
+#include "ref_counted_frame.h"
+#include "metrics.h"
+
+// Since every output frame is based on multiple input frames, we need
+// more than one start timestamp; one for each input.
+// For all of these, steady_clock::time_point::min() is used for “not set”.
+struct ReceivedTimestamps {
+       std::vector<std::chrono::steady_clock::time_point> ts;
+};
+struct LatencyHistogram {
+       void init(const std::string &measuring_point);  // Initializes histograms and registers them in global_metrics.
+
+       // Indices: card number, frame history number, b-frame or not (1/0, where 2 counts both).
+       std::vector<std::vector<std::unique_ptr<Summary[]>>> summaries;
+};
+
+ReceivedTimestamps find_received_timestamp(const std::vector<RefCountedFrame> &input_frames);
+
+void print_latency(const char *header, const ReceivedTimestamps &received_ts, bool is_b_frame, int *frameno, LatencyHistogram *histogram);
+
+#endif  // !defined(_PRINT_LATENCY_H)