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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_MEDIA_MEDIA_CAPTURE_DEVICES_DISPATCHER_H_
#define CHROME_BROWSER_MEDIA_MEDIA_CAPTURE_DEVICES_DISPATCHER_H_
#include "base/callback.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/singleton.h"
#include "base/observer_list.h"
#include "content/public/browser/media_observer.h"
#include "content/public/common/media_stream_request.h"
class AudioStreamIndicator;
class MediaStreamCaptureIndicator;
class PrefRegistrySyncable;
class Profile;
// This singleton is used to receive updates about media events from the content
// layer.
class MediaCaptureDevicesDispatcher : public content::MediaObserver {
public:
class Observer {
public:
// Handle an information update consisting of a up-to-date audio capture
// device lists. This happens when a microphone is plugged in or unplugged.
virtual void OnUpdateAudioDevices(
const content::MediaStreamDevices& devices) {}
// Handle an information update consisting of a up-to-date video capture
// device lists. This happens when a camera is plugged in or unplugged.
virtual void OnUpdateVideoDevices(
const content::MediaStreamDevices& devices) {}
// Handle an information update related to a media stream request.
virtual void OnRequestUpdate(
int render_process_id,
int render_view_id,
const content::MediaStreamDevice& device,
const content::MediaRequestState state) {}
virtual ~Observer() {}
};
static MediaCaptureDevicesDispatcher* GetInstance();
// Registers the preferences related to Media Stream default devices.
static void RegisterUserPrefs(PrefRegistrySyncable* registry);
// Methods for observers. Called on UI thread.
// Observers should add themselves on construction and remove themselves
// on destruction.
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
const content::MediaStreamDevices& GetAudioCaptureDevices();
const content::MediaStreamDevices& GetVideoCaptureDevices();
// Helper to get the default devices which can be used by the media request,
// if the return list is empty, it means there is no available device on the
// OS.
// Called on the UI thread.
void GetDefaultDevicesForProfile(Profile* profile,
bool audio,
bool video,
content::MediaStreamDevices* devices);
// Helper for picking the device that was requested for an OpenDevice request.
// If the device requested is not available it will revert to using the first
// available one instead or will return an empty list if no devices of the
// requested kind are present.
void GetRequestedDevice(const std::string& requested_device_id,
bool audio,
bool video,
content::MediaStreamDevices* devices);
// Overridden from content::MediaObserver:
virtual void OnCaptureDevicesOpened(
int render_process_id,
int render_view_id,
const content::MediaStreamDevices& devices,
const base::Closure& close_callback) OVERRIDE;
virtual void OnCaptureDevicesClosed(
int render_process_id,
int render_view_id,
const content::MediaStreamDevices& devices) OVERRIDE;
virtual void OnAudioCaptureDevicesChanged(
const content::MediaStreamDevices& devices) OVERRIDE;
virtual void OnVideoCaptureDevicesChanged(
const content::MediaStreamDevices& devices) OVERRIDE;
virtual void OnMediaRequestStateChanged(
int render_process_id,
int render_view_id,
const content::MediaStreamDevice& device,
content::MediaRequestState state) OVERRIDE;
virtual void OnAudioStreamPlayingChanged(
int render_process_id,
int render_view_id,
int stream_id,
bool playing) OVERRIDE;
scoped_refptr<MediaStreamCaptureIndicator> GetMediaStreamCaptureIndicator();
scoped_refptr<AudioStreamIndicator> GetAudioStreamIndicator();
private:
friend struct DefaultSingletonTraits<MediaCaptureDevicesDispatcher>;
MediaCaptureDevicesDispatcher();
virtual ~MediaCaptureDevicesDispatcher();
// Called by the MediaObserver() functions, executed on UI thread.
void UpdateAudioDevicesOnUIThread(const content::MediaStreamDevices& devices);
void UpdateVideoDevicesOnUIThread(const content::MediaStreamDevices& devices);
void UpdateMediaRequestStateOnUIThread(
int render_process_id,
int render_view_id,
const content::MediaStreamDevice& device,
content::MediaRequestState state);
// A list of cached audio capture devices.
content::MediaStreamDevices audio_devices_;
// A list of cached video capture devices.
content::MediaStreamDevices video_devices_;
// A list of observers for the device update notifications.
ObserverList<Observer> observers_;
// Flag to indicate if device enumeration has been done/doing.
// Only accessed on UI thread.
bool devices_enumerated_;
scoped_refptr<MediaStreamCaptureIndicator> media_stream_capture_indicator_;
scoped_refptr<AudioStreamIndicator> audio_stream_indicator_;
};
#endif // CHROME_BROWSER_MEDIA_MEDIA_CAPTURE_DEVICES_DISPATCHER_H_
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