Add a summary for the amount of margin we have in reaching the output clock (ie....

diff --git a/decklink_output.cpp b/decklink_output.cpp
index d68467703103966942ce730076ab25875008ad5b..2285bb2a7ceed3b7ac1237224447f8c70ce78380 100644 (file)
--- a/decklink_output.cpp
+++ b/decklink_output.cpp
@@ -12,6 +12,7 @@
 #include "decklink_output.h"
 #include "decklink_util.h"
 #include "flags.h"
+#include "metrics.h"
 #include "print_latency.h"
 #include "timebase.h"
 #include "v210_converter.h"
@@ -45,6 +46,8 @@ atomic<int64_t> metric_decklink_output_completed_frames_unknown{0};
 
 atomic<int64_t> metric_decklink_output_scheduled_samples{0};
 
+Summary metric_decklink_output_margin_seconds;
+
 }  // namespace
 
 DeckLinkOutput::DeckLinkOutput(ResourcePool *resource_pool, QSurface *surface, unsigned width, unsigned height, unsigned card_index)
@@ -73,6 +76,9 @@ DeckLinkOutput::DeckLinkOutput(ResourcePool *resource_pool, QSurface *surface, u
                global_metrics.add("decklink_output_completed_frames", {{ "status", "unknown" }}, &metric_decklink_output_completed_frames_unknown);
 
                global_metrics.add("decklink_output_scheduled_samples", &metric_decklink_output_scheduled_samples);
+               vector<double> quantiles{0.01, 0.1, 0.25, 0.5, 0.75, 0.9, 0.99};
+               metric_decklink_output_margin_seconds.init(quantiles, 60.0);
+               global_metrics.add("decklink_output_margin_seconds", &metric_decklink_output_margin_seconds);
        });
 }
 
@@ -373,6 +379,9 @@ void DeckLinkOutput::wait_for_frame(int64_t pts, int *dropped_frames, int64_t *f
        *frame_timestamp = steady_clock::now() +
                nanoseconds((target_time - stream_frame_time) * 1000000000 / TIMEBASE);
 
+       metric_decklink_output_margin_seconds.count_event(
+               (target_time - stream_frame_time) / double(TIMEBASE));
+
        // If we're ahead of time, wait for the frame to (approximately) start.
        if (stream_frame_time < target_time) {
                should_quit.sleep_until(*frame_timestamp);