+ReceivedTimestamps find_received_timestamp(const vector<RefCountedFrame> &input_frames)
+{
+ unsigned num_cards = global_mixer->get_num_cards();
+ assert(input_frames.size() == num_cards * FRAME_HISTORY_LENGTH);
+
+ ReceivedTimestamps ts;
+ for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
+ for (unsigned frame_index = 0; frame_index < FRAME_HISTORY_LENGTH; ++frame_index) {
+ const RefCountedFrame &input_frame = input_frames[card_index * FRAME_HISTORY_LENGTH + frame_index];
+ if (input_frame == nullptr ||
+ (frame_index > 0 && input_frame.get() == input_frames[card_index * FRAME_HISTORY_LENGTH + frame_index - 1].get())) {
+ ts.ts.push_back(steady_clock::time_point::min());
+ } else {
+ ts.ts.push_back(input_frame->received_timestamp);
+ }
+ }
+ }
+ return ts;
+}
+
+void LatencyHistogram::init(const string &measuring_point)
+{
+ unsigned num_cards = global_flags.num_cards; // The mixer might not be ready yet.
+ summaries.resize(num_cards * FRAME_HISTORY_LENGTH * 2);
+ for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
+ char card_index_str[64];
+ snprintf(card_index_str, sizeof(card_index_str), "%u", card_index);
+ summaries[card_index].resize(FRAME_HISTORY_LENGTH);
+ for (unsigned frame_index = 0; frame_index < FRAME_HISTORY_LENGTH; ++frame_index) {
+ char frame_index_str[64];
+ snprintf(frame_index_str, sizeof(frame_index_str), "%u", frame_index);
+
+ vector<double> quantiles{0.01, 0.1, 0.25, 0.5, 0.75, 0.9, 0.99};
+ summaries[card_index][frame_index].reset(new Summary[3]);
+ summaries[card_index][frame_index][0].init(quantiles, 60.0);
+ summaries[card_index][frame_index][1].init(quantiles, 60.0);
+ summaries[card_index][frame_index][2].init(quantiles, 60.0);
+ global_metrics.add("latency_seconds",
+ {{ "measuring_point", measuring_point },
+ { "card", card_index_str },
+ { "frame_age", frame_index_str },
+ { "frame_type", "i/p" }},
+ &summaries[card_index][frame_index][0],
+ (frame_index == 0) ? Metrics::PRINT_ALWAYS : Metrics::PRINT_WHEN_NONEMPTY);
+ global_metrics.add("latency_seconds",
+ {{ "measuring_point", measuring_point },
+ { "card", card_index_str },
+ { "frame_age", frame_index_str },
+ { "frame_type", "b" }},
+ &summaries[card_index][frame_index][1],
+ Metrics::PRINT_WHEN_NONEMPTY);
+ global_metrics.add("latency_seconds",
+ {{ "measuring_point", measuring_point },
+ { "card", card_index_str },
+ { "frame_age", frame_index_str },
+ { "frame_type", "total" }},
+ &summaries[card_index][frame_index][2],
+ (frame_index == 0) ? Metrics::PRINT_ALWAYS : Metrics::PRINT_WHEN_NONEMPTY);
+ }
+ }
+}
+
+void print_latency(const char *header, const ReceivedTimestamps &received_ts, bool is_b_frame, int *frameno, LatencyHistogram *histogram)