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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.
#ifndef EXTENSIONS_BROWSER_API_OFFSCREEN_AUDIO_LIFETIME_ENFORCER_H_
#define EXTENSIONS_BROWSER_API_OFFSCREEN_AUDIO_LIFETIME_ENFORCER_H_
#include "base/auto_reset.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "content/public/browser/web_contents_observer.h"
#include "extensions/browser/api/offscreen/offscreen_document_lifetime_enforcer.h"
namespace extensions {
// The lifetime enforcer for an offscreen document playing audio. A document
// is considered inactive if a certain amount of time has passed without playing
// audio.
class AudioLifetimeEnforcer : public OffscreenDocumentLifetimeEnforcer,
public content::WebContentsObserver {
public:
AudioLifetimeEnforcer(OffscreenDocumentHost* offscreen_document,
TerminationCallback termination_callback,
NotifyInactiveCallback notify_inactive_callback);
AudioLifetimeEnforcer(const AudioLifetimeEnforcer&) = delete;
AudioLifetimeEnforcer& operator=(const AudioLifetimeEnforcer&) = delete;
~AudioLifetimeEnforcer() override;
// Overrides the time necessary before a document is considered inactive.
static base::AutoReset<base::TimeDelta> SetTimeoutForTesting(
base::TimeDelta timeout);
// OffscreenDocumentLifetimeEnforcer:
bool IsActive() override;
private:
// content::WebContentsObserver:
void OnAudioStateChanged(bool audible) override;
// Posts the delayed task for a document being considered inactive.
void PostTimeoutTask();
// Triggered after a set amount of time of the document not playing audio, at
// which point it should be considered inactive.
void OnAudioTimeout();
// Whether the offscreen document was recently active. We start this off as
// `true` to allow the extension to load audio.
bool was_recently_active_ = true;
base::WeakPtrFactory<AudioLifetimeEnforcer> weak_factory_{this};
};
} // namespace extensions
#endif // EXTENSIONS_BROWSER_API_OFFSCREEN_AUDIO_LIFETIME_ENFORCER_H_
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