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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef CUBEBDEVICEENUMERATOR_H_
+#define CUBEBDEVICEENUMERATOR_H_
+
+#include "AudioDeviceInfo.h"
+#include "cubeb/cubeb.h"
+#include "MediaEventSource.h"
+#include "mozilla/Mutex.h"
+#include "nsTArray.h"
+
+namespace mozilla {
+
+namespace media {
+template <typename T>
+class Refcountable;
+}
+
+// This class implements a cache for accessing the audio device list.
+// It can be accessed on any thread.
+class CubebDeviceEnumerator final {
+ public:
+ NS_INLINE_DECL_THREADSAFE_REFCOUNTING(CubebDeviceEnumerator)
+
+ static CubebDeviceEnumerator* GetInstance();
+ static void Shutdown();
+ using AudioDeviceSet = media::Refcountable<nsTArray<RefPtr<AudioDeviceInfo>>>;
+ // This method returns a list of all the input audio devices
+ // (sources) available on this machine.
+ // This method is safe to call from all threads.
+ RefPtr<const AudioDeviceSet> EnumerateAudioInputDevices();
+ // Similar for the audio audio devices (sinks). Also thread safe.
+ RefPtr<const AudioDeviceSet> EnumerateAudioOutputDevices();
+ // From a device name, return the info for this device, if it's a valid name,
+ // or nullptr otherwise.
+ // This method is safe to call from any thread.
+ enum class Side {
+ INPUT,
+ OUTPUT,
+ };
+ already_AddRefed<AudioDeviceInfo> DeviceInfoFromName(const nsString& aName,
+ Side aSide);
+ // Event source to listen for changes to the audio input device list on.
+ MediaEventSource<void>& OnAudioInputDeviceListChange() {
+ return mOnInputDeviceListChange;
+ }
+
+ // Event source to listen for changes to the audio output device list on.
+ MediaEventSource<void>& OnAudioOutputDeviceListChange() {
+ return mOnOutputDeviceListChange;
+ }
+
+ // Return the default device for a particular side.
+ RefPtr<AudioDeviceInfo> DefaultDevice(Side aSide);
+
+ private:
+ CubebDeviceEnumerator();
+ ~CubebDeviceEnumerator();
+ // Static functions called by cubeb when the audio device list changes
+ // (i.e. when a new device is made available, or non-available). This
+ // simply calls `AudioDeviceListChanged` below.
+ static void InputAudioDeviceListChanged_s(cubeb* aContext, void* aUser);
+ static void OutputAudioDeviceListChanged_s(cubeb* aContext, void* aUser);
+ // Invalidates the cached audio input device list, can be called on any
+ // thread.
+ void AudioDeviceListChanged(Side aSide);
+ RefPtr<const AudioDeviceSet> EnumerateAudioDevices(Side aSide);
+ // Synchronize access to mInputDevices and mOutputDevices;
+ Mutex mMutex MOZ_UNANNOTATED;
+ RefPtr<const AudioDeviceSet> mInputDevices;
+ RefPtr<const AudioDeviceSet> mOutputDevices;
+ // If mManual*Invalidation is true, then it is necessary to query the device
+ // list each time instead of relying on automatic invalidation of the cache by
+ // cubeb itself. Set in the constructor and then can be access on any thread.
+ bool mManualInputInvalidation;
+ bool mManualOutputInvalidation;
+ MediaEventProducer<void> mOnInputDeviceListChange;
+ MediaEventProducer<void> mOnOutputDeviceListChange;
+};
+
+typedef CubebDeviceEnumerator Enumerator;
+typedef CubebDeviceEnumerator::Side EnumeratorSide;
+} // namespace mozilla
+
+#endif // CUBEBDEVICEENUMERATOR_H_