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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/modules/webaudio/audio_playout_stats.h"
#include "base/numerics/safe_conversions.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_binding_for_core.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_object_builder.h"
#include "third_party/blink/renderer/core/execution_context/agent.h"
#include "third_party/blink/renderer/platform/wtf/functional.h"
namespace blink {
AudioPlayoutStats::AudioPlayoutStats(AudioContext* context)
: context_(context) {}
DOMHighResTimeStamp AudioPlayoutStats::fallbackFramesDuration(
ScriptState* script_state) {
MaybeUpdateStats(script_state);
return stats_.glitch_frames_duration().InMillisecondsF();
}
uint32_t AudioPlayoutStats::fallbackFramesEvents(ScriptState* script_state) {
MaybeUpdateStats(script_state);
return base::saturated_cast<uint32_t>(stats_.glitch_event_count());
}
DOMHighResTimeStamp AudioPlayoutStats::totalFramesDuration(
ScriptState* script_state) {
MaybeUpdateStats(script_state);
return (stats_.glitch_frames_duration() + stats_.observed_frames_duration())
.InMillisecondsF();
}
DOMHighResTimeStamp AudioPlayoutStats::averageLatency(
ScriptState* script_state) {
MaybeUpdateStats(script_state);
return stats_.average_latency().InMillisecondsF();
}
DOMHighResTimeStamp AudioPlayoutStats::minimumLatency(
ScriptState* script_state) {
MaybeUpdateStats(script_state);
return stats_.min_latency().InMillisecondsF();
}
DOMHighResTimeStamp AudioPlayoutStats::maximumLatency(
ScriptState* script_state) {
MaybeUpdateStats(script_state);
return stats_.max_latency().InMillisecondsF();
}
void AudioPlayoutStats::resetLatency(ScriptState* script_state) {
MaybeUpdateStats(script_state);
// Reset the latency stats correctly by having a temporary stats object absorb
// them.
AudioFrameStatsAccumulator temp_stats;
temp_stats.Absorb(stats_);
}
ScriptObject AudioPlayoutStats::toJSON(ScriptState* script_state) {
V8ObjectBuilder result(script_state);
result.AddNumber("fallbackFramesDuration",
fallbackFramesDuration(script_state));
result.AddNumber("fallbackFramesEvents", fallbackFramesEvents(script_state));
result.AddNumber("totalFramesDuration", totalFramesDuration(script_state));
result.AddNumber("averageLatency", averageLatency(script_state));
result.AddNumber("minimumLatency", minimumLatency(script_state));
result.AddNumber("maximumLatency", maximumLatency(script_state));
return result.ToScriptObject();
}
void AudioPlayoutStats::Trace(Visitor* visitor) const {
visitor->Trace(context_);
ScriptWrappable::Trace(visitor);
}
void AudioPlayoutStats::MaybeUpdateStats(ScriptState* script_state) {
// We cache the stats in |stats_| in order to preserve the JavaScript
// run-to-completion semantics. If the cached stats were updated in the
// current task, we should not update them again.
if (!context_ || stats_are_from_current_task_) {
return;
}
// Get the latest stats, and remember that we now have stats from the current
// task.
context_->TransferAudioFrameStatsTo(stats_);
stats_are_from_current_task_ = true;
// Queue a microtask to let us know when we are on a new task again, ensuring
// that we get fresh stats in the next task execution cycle.
ToEventLoop(script_state)
.EnqueueMicrotask(WTF::BindOnce(&AudioPlayoutStats::OnMicrotask,
WrapWeakPersistent(this)));
}
void AudioPlayoutStats::OnMicrotask() {
// Since this was queued on the older task when we got the current |stats_|,
// the stats are no longer from the current task.
stats_are_from_current_task_ = false;
}
} // namespace blink
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