1 #ifndef _PRINT_LATENCY_H
2 #define _PRINT_LATENCY_H 1
4 // A small utility function to print the latency between two end points
5 // (typically when the frame was received from the video card, and some
6 // point when the frame is ready to be output in some form).
12 #include "ref_counted_frame.h"
13 #include "shared/metrics.h"
15 // Since every output frame is based on multiple input frames, we need
16 // more than one start timestamp; one for each input.
17 // For all of these, steady_clock::time_point::min() is used for “not set”.
18 struct ReceivedTimestamps {
19 std::vector<std::chrono::steady_clock::time_point> ts;
21 struct LatencyHistogram {
22 void init(const std::string &measuring_point); // Initializes histograms and registers them in global_metrics.
24 // Indices: card number, frame history number, b-frame or not (1/0, where 2 counts both).
25 std::vector<std::vector<std::unique_ptr<Summary[]>>> summaries;
28 ReceivedTimestamps find_received_timestamp(const std::vector<RefCountedFrame> &input_frames);
30 void print_latency(const char *header, const ReceivedTimestamps &received_ts, bool is_b_frame, int *frameno, LatencyHistogram *histogram);
32 #endif // !defined(_PRINT_LATENCY_H)