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// Copyright 2017 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_AUDIO_AUDIO_DEVICE_ID_CALCULATOR_H_
#define EXTENSIONS_BROWSER_API_AUDIO_AUDIO_DEVICE_ID_CALCULATOR_H_
#include <map>
#include <string>
#include "base/memory/raw_ptr.h"
namespace content {
class BrowserContext;
}
namespace extensions {
// Helper class used to translate stable device IDs provided by audio service
// to stable ID values exposable to apps using chrome.audio API.
// Problem with stable device IDs provided by audio service is that they can be
// globally unique for audio devices and thus can be used by apps to identify a
// particular device. `AudioDeviceCalculator` provides stable mapping (saved in
// user prefs) from potentially globally unique ID to an ordinal ID (devices are
// assigned IDs incrementally, as they are added to the mapping) scoped to a
// browser context.
class AudioDeviceIdCalculator {
public:
explicit AudioDeviceIdCalculator(content::BrowserContext* context);
AudioDeviceIdCalculator(const AudioDeviceIdCalculator&) = delete;
AudioDeviceIdCalculator& operator=(const AudioDeviceIdCalculator&) = delete;
virtual ~AudioDeviceIdCalculator();
// Gets audio API stable device ID for the audio device whose stable device ID
// equals `audio_service_stable_id`.
std::string GetStableDeviceId(uint64_t audio_service_stable_id);
private:
// Loads stable ID mapping saved in user prefs.
// Stable device ID map is saved in prefs as list of stable IDs provided by
// audio service - stable ID at index i in the list is mapped to the ID "i".
void LoadStableIdMap();
// Generates and persists audio API stable device ID for the device whose
// audio service stable device ID equals `audio_service_stable_id`.
// Returns the generated ID.
std::string GenerateNewStableDeviceId(
const std::string& audio_service_stable_id);
raw_ptr<content::BrowserContext, DanglingUntriaged> context_;
// Maps a stable device ID as exposed by audio service to the associated
// stable device ID that should be exposed to apps via chrome.audio API.
std::map<std::string, std::string> stable_id_map_;
bool stable_id_map_loaded_ = false;
};
} // namespace extensions
#endif // EXTENSIONS_BROWSER_API_AUDIO_AUDIO_DEVICE_ID_CALCULATOR_H_
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