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// Copyright 2016 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_RENDERER_PEPPER_PEPPER_AUDIO_CONTROLLER_H_
#define CONTENT_RENDERER_PEPPER_PEPPER_AUDIO_CONTROLLER_H_
#include <set>
#include "base/macros.h"
namespace content {
class PepperAudioOutputHost;
class PepperPluginInstanceImpl;
class PPB_Audio_Impl;
/**
* This class controls all the active audio instances of a Pepper instance.
* This class can only be a non-shareable member of PepperPluginInstanceImpl.
*/
class PepperAudioController {
public:
explicit PepperAudioController(PepperPluginInstanceImpl* instance);
virtual ~PepperAudioController();
// Adds an audio instance to the controller.
void AddInstance(PPB_Audio_Impl* audio);
void AddInstance(PepperAudioOutputHost* audio_output);
// Removes an audio instance from the controller.
void RemoveInstance(PPB_Audio_Impl* audio);
void RemoveInstance(PepperAudioOutputHost* audio_output);
// Sets the volume of all audio instances.
void SetVolume(double volume);
// The pepper instance has been deleted. This method can only be called
// once. The controller will be invalidated after this call, and then all
// other methods will be no-op.
void OnPepperInstanceDeleted();
private:
// Notifies the RenderFrame that the playback has stopped. This method should
// only be called when |ppb_audios_| turns from non-empty to empty.
void NotifyPlaybackStopsOnEmpty();
// Helper functions to deal with the first and last audio instance.
void StartPlaybackIfFirstInstance();
void StopPlaybackIfLastInstance();
// All active audio instances that are using the old
// PPB_Audio interface.
std::set<PPB_Audio_Impl*> ppb_audios_;
// All active audio output instances that are using the new
// PPB_AudioOutput interface.
std::set<PepperAudioOutputHost*> audio_output_hosts_;
// The Pepper instance which this controller is for. Will be null after
// OnPepperInstanceDeleted() is called.
PepperPluginInstanceImpl* instance_;
DISALLOW_COPY_AND_ASSIGN(PepperAudioController);
};
} // namespace content
#endif // CONTENT_RENDERER_PEPPER_PEPPER_AUDIO_CONTROLLER_H_
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