79 lines
3 KiB
C
79 lines
3 KiB
C
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// Copyright (c) 2013 GitHub, Inc. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef CHROME_BROWSER_MEDIA_MEDIA_CAPTURE_DEVICES_DISPATCHER_H_
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#define CHROME_BROWSER_MEDIA_MEDIA_CAPTURE_DEVICES_DISPATCHER_H_
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#include "base/callback.h"
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#include "base/memory/scoped_ptr.h"
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#include "base/memory/singleton.h"
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#include "base/observer_list.h"
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#include "content/public/browser/media_observer.h"
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#include "content/public/common/media_stream_request.h"
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// This singleton is used to receive updates about media events from the content
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// layer.
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class MediaCaptureDevicesDispatcher : public content::MediaObserver {
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public:
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static MediaCaptureDevicesDispatcher* GetInstance();
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// Helper for picking the device that was requested for an OpenDevice request.
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// If the device requested is not available it will revert to using the first
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// available one instead or will return an empty list if no devices of the
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// requested kind are present.
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void GetRequestedDevice(const std::string& requested_device_id,
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bool audio,
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bool video,
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content::MediaStreamDevices* devices);
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void GetDefaultDevices(bool audio,
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bool video,
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content::MediaStreamDevices* devices);
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const content::MediaStreamDevices& GetAudioCaptureDevices();
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const content::MediaStreamDevices& GetVideoCaptureDevices();
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// Overridden from content::MediaObserver:
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virtual void OnAudioCaptureDevicesChanged(
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const content::MediaStreamDevices& devices) OVERRIDE;
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virtual void OnVideoCaptureDevicesChanged(
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const content::MediaStreamDevices& devices) OVERRIDE;
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virtual void OnMediaRequestStateChanged(
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int render_process_id,
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int render_view_id,
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const content::MediaStreamDevice& device,
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content::MediaRequestState state) OVERRIDE;
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virtual void OnAudioStreamPlayingChanged(
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int render_process_id,
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int render_view_id,
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int stream_id,
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bool playing) OVERRIDE {}
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private:
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friend struct DefaultSingletonTraits<MediaCaptureDevicesDispatcher>;
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MediaCaptureDevicesDispatcher();
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virtual ~MediaCaptureDevicesDispatcher();
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// Called by the MediaObserver() functions, executed on UI thread.
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void UpdateAudioDevicesOnUIThread(const content::MediaStreamDevices& devices);
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void UpdateVideoDevicesOnUIThread(const content::MediaStreamDevices& devices);
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void UpdateMediaRequestStateOnUIThread(
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int render_process_id,
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int render_view_id,
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const content::MediaStreamDevice& device,
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content::MediaRequestState state);
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// A list of cached audio capture devices.
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content::MediaStreamDevices audio_devices_;
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// A list of cached video capture devices.
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content::MediaStreamDevices video_devices_;
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// Flag to indicate if device enumeration has been done/doing.
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// Only accessed on UI thread.
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bool devices_enumerated_;
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};
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#endif // CHROME_BROWSER_MEDIA_MEDIA_CAPTURE_DEVICES_DISPATCHER_H_
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