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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_MEDIA_AUDIO_STATE_PROVIDER_H_
#define CONTENT_BROWSER_MEDIA_AUDIO_STATE_PROVIDER_H_
#include "content/common/content_export.h"
namespace content {
class WebContents;
class AudioStreamMonitor;
// This class is associated with a WebContents, and maintains the audible
// state regarding all the players in it.
// The audible state is true if at least one player is playing a sound.
// Whenever the audible state of the WebContents as a whole changes, this
// class sends a notification to it.
//
// Each WebContentsImpl owns an AudioStateProvider
class CONTENT_EXPORT AudioStateProvider {
public:
explicit AudioStateProvider(WebContents* web_contents);
virtual ~AudioStateProvider() {}
// Indicates whether this service is available on the system.
virtual bool IsAudioStateAvailable() const = 0;
// If this provider uses monitoring (i.e. measure the signal),
// return its monitor.
virtual AudioStreamMonitor* audio_stream_monitor() = 0;
// Returns true if the WebContents is playing or has recently been
// playing the sound.
virtual bool WasRecentlyAudible() const;
void set_was_recently_audible_for_testing(bool value) {
was_recently_audible_ = value;
}
protected:
// Notify WebContents that the audio state has changed.
void Notify(bool new_state);
// The WebContents instance instance to receive indicator toggle
// notifications. This pointer should be valid for the lifetime of
// AudioStreamMonitor.
WebContents* const web_contents_;
// The audio state that is being maintained
bool was_recently_audible_;
};
} // namespace content
#endif // CONTENT_BROWSER_MEDIA_AUDIO_STATE_PROVIDER_H_
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