зеркало из https://github.com/mozilla/gecko-dev.git
90 строки
3.5 KiB
C++
90 строки
3.5 KiB
C++
/* 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef CUBEBDEVICEENUMERATOR_H_
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#define CUBEBDEVICEENUMERATOR_H_
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#include "AudioDeviceInfo.h"
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#include "CubebUtils.h"
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#include "cubeb/cubeb.h"
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#include "MediaEventSource.h"
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#include "mozilla/Mutex.h"
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#include "nsTArray.h"
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namespace mozilla {
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// This class implements a cache for accessing the audio device list.
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// It can be accessed on any thread.
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class CubebDeviceEnumerator final {
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public:
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(CubebDeviceEnumerator)
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static CubebDeviceEnumerator* GetInstance();
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static void Shutdown();
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// This method returns a list of all the input audio devices
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// (sources) available on this machine.
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// This method is safe to call from all threads.
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void EnumerateAudioInputDevices(
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nsTArray<RefPtr<AudioDeviceInfo>>& aOutDevices);
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// Similar for the audio audio devices (sinks). Also thread safe.
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void EnumerateAudioOutputDevices(
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nsTArray<RefPtr<AudioDeviceInfo>>& aOutDevices);
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// From a cubeb device id, return the info for this device, if it's still a
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// valid id, or nullptr otherwise.
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// This method is safe to call from any thread.
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already_AddRefed<AudioDeviceInfo> DeviceInfoFromID(
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CubebUtils::AudioDeviceID aID);
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// From a device name, return the info for this device, if it's a valid name,
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// or nullptr otherwise.
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// This method is safe to call from any thread.
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already_AddRefed<AudioDeviceInfo> DeviceInfoFromName(const nsString& aName);
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enum class Side {
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INPUT,
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OUTPUT,
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};
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already_AddRefed<AudioDeviceInfo> DeviceInfoFromName(const nsString& aName,
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Side aSide);
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// Event source to listen for changes to the audio input device list on.
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MediaEventSource<void>& OnAudioInputDeviceListChange() {
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return mOnInputDeviceListChange;
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}
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// Event source to listen for changes to the audio output device list on.
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MediaEventSource<void>& OnAudioOutputDeviceListChange() {
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return mOnOutputDeviceListChange;
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}
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// Return the default device for a particular side.
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RefPtr<AudioDeviceInfo> DefaultDevice(Side aSide);
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private:
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CubebDeviceEnumerator();
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~CubebDeviceEnumerator();
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// Static functions called by cubeb when the audio device list changes
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// (i.e. when a new device is made available, or non-available). This
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// simply calls `AudioDeviceListChanged` below.
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static void InputAudioDeviceListChanged_s(cubeb* aContext, void* aUser);
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static void OutputAudioDeviceListChanged_s(cubeb* aContext, void* aUser);
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// Invalidates the cached audio input device list, can be called on any
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// thread.
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void AudioDeviceListChanged(Side aSide);
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void EnumerateAudioDevices(Side aSide);
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// Synchronize access to mInputDevices and mOutputDevices;
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Mutex mMutex;
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nsTArray<RefPtr<AudioDeviceInfo>> mInputDevices;
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nsTArray<RefPtr<AudioDeviceInfo>> mOutputDevices;
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// If mManual*Invalidation is true, then it is necessary to query the device
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// list each time instead of relying on automatic invalidation of the cache by
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// cubeb itself. Set in the constructor and then can be access on any thread.
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bool mManualInputInvalidation;
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bool mManualOutputInvalidation;
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MediaEventProducer<void> mOnInputDeviceListChange;
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MediaEventProducer<void> mOnOutputDeviceListChange;
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};
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typedef CubebDeviceEnumerator Enumerator;
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typedef CubebDeviceEnumerator::Side EnumeratorSide;
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} // namespace mozilla
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#endif // CUBEBDEVICEENUMERATOR_H_
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