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// Copyright 2022 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/platform/peerconnection/vsync_tick_provider.h"
#include <memory>
#include "base/functional/bind.h"
#include "base/sequence_checker.h"
#include "base/task/bind_post_task.h"
#include "base/task/sequenced_task_runner.h"
#include "base/trace_event/typed_macros.h"
namespace blink {
// static
scoped_refptr<VSyncTickProvider> VSyncTickProvider::Create(
VSyncProvider& provider,
scoped_refptr<base::SequencedTaskRunner> sequence,
scoped_refptr<MetronomeSource::TickProvider> default_tick_provider) {
scoped_refptr<VSyncTickProvider> tick_provider(new VSyncTickProvider(
provider, sequence, std::move(default_tick_provider)));
sequence->PostTask(FROM_HERE,
base::BindOnce(&VSyncTickProvider::Initialize,
tick_provider->weak_factory_.GetWeakPtr()));
return tick_provider;
}
VSyncTickProvider::VSyncTickProvider(
VSyncProvider& vsync_provider,
scoped_refptr<base::SequencedTaskRunner> sequence,
scoped_refptr<MetronomeSource::TickProvider> default_tick_provider)
: vsync_provider_(vsync_provider),
sequence_(std::move(sequence)),
default_tick_provider_(std::move(default_tick_provider)) {
DETACH_FROM_SEQUENCE(sequence_checker_);
}
VSyncTickProvider::~VSyncTickProvider() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
}
void VSyncTickProvider::Initialize() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
vsync_provider_->Initialize(base::BindPostTask(
sequence_,
base::BindRepeating(&VSyncTickProvider::OnTabVisibilityChange,
weak_factory_.GetWeakPtr()),
FROM_HERE));
}
void VSyncTickProvider::RequestCallOnNextTick(base::OnceClosure callback) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
tick_callbacks_.push_back(std::move(callback));
DCHECK_GT(tick_callbacks_.size(), 0u);
if (state_ == State::kDrivenByVSync) {
ScheduleVSync();
} else {
ScheduleDefaultTick();
}
}
base::TimeDelta VSyncTickProvider::TickPeriod() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (state_ != State::kDrivenByVSync) {
return default_tick_provider_->TickPeriod();
}
return kVSyncTickPeriod;
}
void VSyncTickProvider::ScheduleVSync() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
TRACE_EVENT0("webrtc", "ScheduleVSync");
DCHECK_NE(state_, State::kDrivenByDefault);
vsync_provider_->SetVSyncCallback(
base::BindPostTask(sequence_,
base::BindOnce(&VSyncTickProvider::OnVSync,
weak_tick_factory_.GetWeakPtr()),
FROM_HERE));
}
void VSyncTickProvider::ScheduleDefaultTick() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
TRACE_EVENT0("webrtc", "ScheduleDefaultTick");
default_tick_provider_->RequestCallOnNextTick(base::BindOnce(
&VSyncTickProvider::OnDefaultTick, weak_tick_factory_.GetWeakPtr()));
}
void VSyncTickProvider::OnDefaultTick() {
TRACE_EVENT0("webrtc", "OnDefaultTick");
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
MaybeCalloutToClient();
}
void VSyncTickProvider::OnVSync() {
TRACE_EVENT0("webrtc", "OnVSync");
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (state_ == State::kAwaitingVSync) {
// Cancel old timer callbacks in flight.
weak_tick_factory_.InvalidateWeakPtrs();
state_ = State::kDrivenByVSync;
}
MaybeCalloutToClient();
}
void VSyncTickProvider::MaybeCalloutToClient() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
WTF::Vector<base::OnceClosure> tick_callbacks;
tick_callbacks.swap(tick_callbacks_);
for (auto& tick_callback : tick_callbacks) {
std::move(tick_callback).Run();
}
}
void VSyncTickProvider::OnTabVisibilityChange(bool visible) {
TRACE_EVENT0("webrtc", __func__);
TRACE_EVENT_INSTANT1("webrtc", __func__, TRACE_EVENT_SCOPE_PROCESS, "visible",
visible);
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (state_ == State::kDrivenByDefault && visible) {
state_ = State::kAwaitingVSync;
ScheduleVSync();
} else if (state_ != State::kDrivenByDefault && !visible) {
// Schedule a new timer call and cancel old callbacks if driven by
// vsyncs, since we're still driving default callbacks while we're
// awaiting the first vsync.
if (state_ == State::kDrivenByVSync) {
weak_tick_factory_.InvalidateWeakPtrs();
ScheduleDefaultTick();
}
state_ = State::kDrivenByDefault;
}
}
} // namespace blink
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