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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.
#include "extensions/browser/api/audio/audio_device_id_calculator.h"
#include "base/strings/string_number_conversions.h"
#include "components/prefs/pref_service.h"
#include "components/prefs/scoped_user_pref_update.h"
#include "extensions/browser/api/audio/pref_names.h"
#include "extensions/browser/extensions_browser_client.h"
namespace extensions {
AudioDeviceIdCalculator::AudioDeviceIdCalculator(
content::BrowserContext* context)
: context_(context) {}
AudioDeviceIdCalculator::~AudioDeviceIdCalculator() = default;
std::string AudioDeviceIdCalculator::GetStableDeviceId(
uint64_t audio_service_stable_id) {
if (!stable_id_map_loaded_) {
LoadStableIdMap();
}
std::string audio_service_stable_id_str =
base::NumberToString(audio_service_stable_id);
const auto& it = stable_id_map_.find(audio_service_stable_id_str);
if (it != stable_id_map_.end()) {
return it->second;
}
return GenerateNewStableDeviceId(audio_service_stable_id_str);
}
void AudioDeviceIdCalculator::LoadStableIdMap() {
DCHECK(!stable_id_map_loaded_);
PrefService* pref_service =
ExtensionsBrowserClient::Get()->GetPrefServiceForContext(context_);
const base::Value::List& audio_service_stable_ids =
pref_service->GetList(kAudioApiStableDeviceIds);
const base::Value::List& ids_list = audio_service_stable_ids;
for (size_t i = 0; i < ids_list.size(); ++i) {
const std::string* audio_service_stable_id = ids_list[i].GetIfString();
if (!audio_service_stable_id) {
NOTREACHED() << "Non string stable device ID.";
}
stable_id_map_[*audio_service_stable_id] = base::NumberToString(i);
}
stable_id_map_loaded_ = true;
}
std::string AudioDeviceIdCalculator::GenerateNewStableDeviceId(
const std::string& audio_service_stable_id) {
DCHECK(stable_id_map_loaded_);
DCHECK_EQ(0u, stable_id_map_.count(audio_service_stable_id));
ScopedListPrefUpdate update(
ExtensionsBrowserClient::Get()->GetPrefServiceForContext(context_),
kAudioApiStableDeviceIds);
std::string api_stable_id = base::NumberToString(update->size());
stable_id_map_[audio_service_stable_id] = api_stable_id;
update->Append(audio_service_stable_id);
return api_stable_id;
}
} // namespace extensions
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