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// Copyright (c) 2013 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 EXTENSIONS_BROWSER_API_AUDIO_AUDIO_SERVICE_H_
#define EXTENSIONS_BROWSER_API_AUDIO_AUDIO_SERVICE_H_
#include <string>
#include <vector>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/linked_ptr.h"
#include "extensions/common/api/audio.h"
namespace extensions {
using OutputInfo = std::vector<linked_ptr<core_api::audio::OutputDeviceInfo>>;
using InputInfo = std::vector<linked_ptr<core_api::audio::InputDeviceInfo>>;
using DeviceIdList = std::vector<std::string>;
using DeviceInfoList =
std::vector<linked_ptr<core_api::audio::AudioDeviceInfo>>;
class AudioService {
public:
class Observer {
public:
// Called when anything changes to the audio device configuration.
virtual void OnDeviceChanged() = 0;
// Called when the sound level of an active audio device changes.
virtual void OnLevelChanged(const std::string& id, int level) = 0;
// Called when the mute state of audio input/output changes.
virtual void OnMuteChanged(bool is_input, bool is_muted) = 0;
// Called when the audio devices change, either new devices being added, or
// existing devices being removed.
virtual void OnDevicesChanged(const DeviceInfoList&) = 0;
protected:
virtual ~Observer() {}
};
// Callback type for completing to get audio device information.
typedef base::Callback<void(const OutputInfo&, const InputInfo&, bool)>
GetInfoCallback;
// Creates a platform-specific AudioService instance.
static AudioService* CreateInstance();
virtual ~AudioService() {}
// Called by listeners to this service to add/remove themselves as observers.
virtual void AddObserver(Observer* observer) = 0;
virtual void RemoveObserver(Observer* observer) = 0;
// Start to query audio device information. Should be called on UI thread.
// The |callback| will be invoked once the query is completed.
virtual void StartGetInfo(const GetInfoCallback& callback) = 0;
// Sets the active devices to the devices specified by |device_list|.
// It can pass in the "complete" active device list of either input
// devices, or output devices, or both. If only input devices are passed in,
// it will only change the input devices' active status, output devices will
// NOT be changed; similarly for the case if only output devices are passed.
// If the devices specified in |new_active_ids| are already active, they will
// remain active. Otherwise, the old active devices will be de-activated
// before we activate the new devices with the same type(input/output).
virtual void SetActiveDevices(const DeviceIdList& device_list) = 0;
// Set the muted and volume/gain properties of a device.
virtual bool SetDeviceProperties(const std::string& device_id,
bool muted,
int volume,
int gain) = 0;
protected:
AudioService() {}
private:
DISALLOW_COPY_AND_ASSIGN(AudioService);
};
} // namespace extensions
#endif // EXTENSIONS_BROWSER_API_AUDIO_AUDIO_SERVICE_H_
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