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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_WEBRTC_MEDIA_STREAM_DEVICE_ENUMERATOR_H_
#define COMPONENTS_WEBRTC_MEDIA_STREAM_DEVICE_ENUMERATOR_H_
#include <optional>
#include <string>
#include "third_party/blink/public/common/mediastream/media_stream_request.h"
#include "third_party/blink/public/mojom/mediastream/media_stream.mojom-forward.h"
namespace content {
class BrowserContext;
}
namespace webrtc {
// Enumerates system devices for MediaStreamDevicesController.
class MediaStreamDeviceEnumerator {
public:
// Helper to get the default devices which can be used by the media request.
// Uses the first available devices if the default devices are not available.
// If the return list is empty, it means there is no available device on the
// OS.
virtual const blink::MediaStreamDevices& GetAudioCaptureDevices() const = 0;
virtual const blink::MediaStreamDevices& GetVideoCaptureDevices() const = 0;
// Helpers for picking particular requested devices, identified by raw id.
// If the device requested is not available it will return std::nullopt.
// If `eligible_*_device_ids` is empty, return the most preferred
// device without filtering.
virtual const std::optional<blink::MediaStreamDevice>
GetPreferredAudioDeviceForBrowserContext(
content::BrowserContext* context,
const std::vector<std::string>& eligible_audio_device_ids) const = 0;
virtual const std::optional<blink::MediaStreamDevice>
GetPreferredVideoDeviceForBrowserContext(
content::BrowserContext* context,
const std::vector<std::string>& eligible_video_device_ids) const = 0;
protected:
virtual ~MediaStreamDeviceEnumerator() = default;
};
} // namespace webrtc
#endif // COMPONENTS_WEBRTC_MEDIA_STREAM_DEVICE_ENUMERATOR_H_
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