git.sesse.net Git - nageru/blob - print_latency.cpp

   1 #include "print_latency.h"
   2 #include "flags.h"
   3
   4 #include <stdio.h>
   5 #include <chrono>
   6 #include <string>
   7
   8 using namespace std;
   9 using namespace std::chrono;
  10
  11 void print_latency(const string &header, const ReceivedTimestamps &received_ts, bool is_b_frame, int *frameno)
  12 {
  13         if (received_ts.max_ts == steady_clock::time_point::min())
  14                 return;
  15
  16         // 101 is chosen so that it's prime, which is unlikely to get the same frame type every time.
  17         if (global_flags.print_video_latency && (++*frameno % 101) == 0) {
  18                 const steady_clock::time_point now = steady_clock::now();
  19                 printf("%-60s %4.0f ms (lowest-latency input), %4.0f ms (highest-latency input)",
  20                         header.c_str(),
  21                         1e3 * std::chrono::duration<double>(now - received_ts.max_ts).count(),
  22                         1e3 * std::chrono::duration<double>(now - received_ts.min_ts).count());
  23
  24                 if (is_b_frame) {
  25                         printf("  [on B-frame; potential extra latency]\n");
  26                 } else {
  27                         printf("\n");
  28                 }
  29         }
  30 }