128 lines
5.0 KiB
C++
128 lines
5.0 KiB
C++
// Copyright (c) 2012 The Chromium Authors. 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 CEF_LIBCEF_BROWSER_MEDIA_CAPTURE_DEVICES_DISPATCHER_H_
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#define CEF_LIBCEF_BROWSER_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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class PrefRegistrySimple;
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class PrefService;
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// This singleton is used to receive updates about media events from the content
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// layer. Based on chrome/browser/media/media_capture_devices_dispatcher.[h|cc].
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class CefMediaCaptureDevicesDispatcher : public content::MediaObserver {
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public:
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class Observer {
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public:
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// Handle an information update consisting of a up-to-date audio capture
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// device lists. This happens when a microphone is plugged in or unplugged.
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virtual void OnUpdateAudioDevices(
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const content::MediaStreamDevices& devices) {}
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// Handle an information update consisting of a up-to-date video capture
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// device lists. This happens when a camera is plugged in or unplugged.
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virtual void OnUpdateVideoDevices(
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const content::MediaStreamDevices& devices) {}
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// Handle an information update related to a media stream request.
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virtual void OnRequestUpdate(
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int render_process_id,
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int render_view_id,
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int page_request_id,
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const content::MediaStreamDevice& device,
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const content::MediaRequestState state) {}
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virtual ~Observer() {}
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};
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static CefMediaCaptureDevicesDispatcher* GetInstance();
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// Registers the preferences related to Media Stream default devices.
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static void RegisterPrefs(PrefRegistrySimple* registry);
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// Methods for observers. Called on UI thread.
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// Observers should add themselves on construction and remove themselves
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// on destruction.
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void AddObserver(Observer* observer);
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void RemoveObserver(Observer* observer);
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const content::MediaStreamDevices& GetAudioCaptureDevices();
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const content::MediaStreamDevices& GetVideoCaptureDevices();
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// Helper to get the default devices which can be used by the media request,
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// if the return list is empty, it means there is no available device on the
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// OS.
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// Called on the UI thread.
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void GetDefaultDevices(PrefService* prefs,
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bool audio,
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bool video,
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content::MediaStreamDevices* devices);
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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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// 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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int page_request_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 is_playing,
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float power_dbfs,
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bool clipped) OVERRIDE;
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virtual void OnCreatingAudioStream(int render_process_id,
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int render_view_id) OVERRIDE;
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private:
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friend struct DefaultSingletonTraits<CefMediaCaptureDevicesDispatcher>;
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CefMediaCaptureDevicesDispatcher();
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virtual ~CefMediaCaptureDevicesDispatcher();
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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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int page_request_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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// A list of observers for the device update notifications.
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ObserverList<Observer> observers_;
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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 // CEF_LIBCEF_BROWSER_MEDIA_CAPTURE_DEVICES_DISPATCHER_H_
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