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Adds support for tracking OnFrame PostTask delta times

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Does not change any functionality but improves the ability to look
for (using Perfetto) possible latency issues where a posted task might
be prevented from running.

Bug: webrtc:15456
Change-Id: I522599c646c8de2183074628df9cab337b1cb85d
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/322121
Reviewed-by: Markus Handell <handellm@webrtc.org>
Commit-Queue: Henrik Andreassson <henrika@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#40854}
This commit is contained in:
henrika 2023-10-02 11:59:26 +02:00 committed by WebRTC LUCI CQ
parent 4d2d215b73
commit bce7ce7ba0
1 changed files with 17 additions and 3 deletions
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20
video/frame_cadence_adapter.cc
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@ -373,13 +373,21 @@ void ZeroHertzAdapterMode::OnFrame(Timestamp post_time,
// Store the frame in the queue and schedule deferred processing.
queued_frames_.push_back(frame);
int frame_id = current_frame_id_;
current_frame_id_++;
scheduled_repeat_ = absl::nullopt;
TimeDelta time_spent_since_post = clock_->CurrentTime() - post_time;
Timestamp task_post_time = clock_->CurrentTime();
TimeDelta time_spent_since_post = task_post_time - post_time;
TRACE_EVENT_ASYNC_BEGIN0(TRACE_DISABLED_BY_DEFAULT("webrtc"), "FrameToQueue2",
frame_id);
queue_->PostDelayedHighPrecisionTask(
SafeTask(safety_.flag(),
[this] {
[this, frame_id, task_post_time] {
RTC_DCHECK_RUN_ON(&sequence_checker_);
TRACE_EVENT_ASYNC_END1(
TRACE_DISABLED_BY_DEFAULT("webrtc"), "FrameToQueue2",
frame_id, "delay_us",
(clock_->CurrentTime() - task_post_time).us());
ProcessOnDelayedCadence();
}),
std::max(frame_delay_ - time_spent_since_post, TimeDelta::Zero()));
@ -647,11 +655,17 @@ void FrameCadenceAdapterImpl::OnFrame(const VideoFrame& frame) {
// Local time in webrtc time base.
Timestamp post_time = clock_->CurrentTime();
frames_scheduled_for_processing_.fetch_add(1, std::memory_order_relaxed);
TRACE_EVENT_ASYNC_BEGIN0(TRACE_DISABLED_BY_DEFAULT("webrtc"), "FrameToQueue1",
frame.id());
queue_->PostTask(SafeTask(safety_.flag(), [this, post_time, frame] {
RTC_DCHECK_RUN_ON(queue_);
Timestamp current_time = clock_->CurrentTime();
TRACE_EVENT_ASYNC_END1(TRACE_DISABLED_BY_DEFAULT("webrtc"), "FrameToQueue1",
frame.id(), "delay_us",
(current_time - post_time).us());
if (zero_hertz_adapter_created_timestamp_.has_value()) {
TimeDelta time_until_first_frame =
clock_->CurrentTime() - *zero_hertz_adapter_created_timestamp_;
current_time - *zero_hertz_adapter_created_timestamp_;
zero_hertz_adapter_created_timestamp_ = absl::nullopt;
RTC_HISTOGRAM_COUNTS_10000(
"WebRTC.Screenshare.ZeroHz.TimeUntilFirstFrameMs",