зеркало из https://github.com/mozilla/gecko-dev.git
86 строки
2.6 KiB
C++
86 строки
2.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "AudioNotificationReceiver.h"
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#include "mozilla/Logging.h" // for LazyLogModule
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#include "mozilla/StaticMutex.h" // for StaticMutex
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#include "mozilla/StaticPtr.h" // for StaticAutoPtr
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#include "nsAppRunner.h" // for XRE_IsContentProcess
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#include "nsTArray.h" // for nsTArray
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static mozilla::LazyLogModule sLogger("AudioNotificationReceiver");
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#undef ANR_LOG
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#define ANR_LOG(...) MOZ_LOG(sLogger, mozilla::LogLevel::Debug, (__VA_ARGS__))
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#undef ANR_LOGW
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#define ANR_LOGW(...) \
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MOZ_LOG(sLogger, mozilla::LogLevel::Warning, (__VA_ARGS__))
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namespace mozilla {
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namespace audio {
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/*
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* A list containing all clients subscribering the device-changed notifications.
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*/
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static StaticAutoPtr<nsTArray<DeviceChangeListener*>> sSubscribers;
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static StaticMutex sMutex;
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/*
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* AudioNotificationReceiver Implementation
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*/
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/* static */ void AudioNotificationReceiver::Register(
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DeviceChangeListener* aDeviceChangeListener) {
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MOZ_ASSERT(XRE_IsContentProcess());
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StaticMutexAutoLock lock(sMutex);
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if (!sSubscribers) {
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sSubscribers = new nsTArray<DeviceChangeListener*>();
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}
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sSubscribers->AppendElement(aDeviceChangeListener);
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ANR_LOG("The DeviceChangeListener: %p is registered successfully.",
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aDeviceChangeListener);
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}
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/* static */ void AudioNotificationReceiver::Unregister(
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DeviceChangeListener* aDeviceChangeListener) {
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MOZ_ASSERT(XRE_IsContentProcess());
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StaticMutexAutoLock lock(sMutex);
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MOZ_ASSERT(!sSubscribers->IsEmpty(), "No subscriber.");
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sSubscribers->RemoveElement(aDeviceChangeListener);
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if (sSubscribers->IsEmpty()) {
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// Clear the static pointer here to prevent memory leak.
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sSubscribers = nullptr;
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}
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ANR_LOG("The DeviceChangeListener: %p is unregistered successfully.",
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aDeviceChangeListener);
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}
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/* static */ void AudioNotificationReceiver::NotifyDefaultDeviceChanged() {
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MOZ_ASSERT(XRE_IsContentProcess());
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StaticMutexAutoLock lock(sMutex);
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// Do nothing when there is no DeviceChangeListener.
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if (!sSubscribers) {
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return;
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}
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for (DeviceChangeListener* stream : *sSubscribers) {
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ANR_LOG(
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"Notify the DeviceChangeListener: %p "
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"that the default device has been changed.",
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stream);
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stream->ResetDefaultDevice();
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}
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}
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} // namespace audio
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} // namespace mozilla
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