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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.
// MediaStreamManager is used to open/enumerate media capture devices (video
// supported now). Call flow:
// 1. GenerateStream is called when a render process wants to use a capture
// device.
// 2. MediaStreamManager will ask MediaStreamDeviceSettings for permission to
// use devices and for which device to use.
// 3. MediaStreamManager will request the corresponding media device manager(s)
// to enumerate available devices. The result will be given to
// MediaStreamDeviceSettings.
// 4. MediaStreamDeviceSettings will, by using user settings, pick devices which
// devices to use and let MediaStreamManager know the result.
// 5. MediaStreamManager will call the proper media device manager to open the
// device and let the MediaStreamRequester know it has been done.
// When enumeration and open are done in separate operations,
// MediaStreamDeviceSettings is not involved as in steps.
#ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_MANAGER_H_
#define CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_MANAGER_H_
#include <map>
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/ref_counted.h"
#include "base/threading/thread.h"
#include "base/win/scoped_com_initializer.h"
#include "content/browser/renderer_host/media/media_stream_provider.h"
#include "content/browser/renderer_host/media/media_stream_settings_requester.h"
#include "content/common/media/media_stream_options.h"
#include "content/common/content_export.h"
#include "content/public/browser/browser_thread.h"
using base::win::ScopedCOMInitializer;
namespace media_stream {
class AudioInputDeviceManager;
class MediaStreamDeviceSettings;
class MediaStreamRequester;
class VideoCaptureManager;
// Thread that enters MTA on windows, and is base::Thread on linux and mac.
class DeviceThread : public base::Thread {
public:
explicit DeviceThread(const char* name)
: base::Thread(name),
com_init_(ScopedCOMInitializer::kMTA) {}
private:
ScopedCOMInitializer com_init_;
DISALLOW_COPY_AND_ASSIGN(DeviceThread);
};
// MediaStreamManager is used to generate and close new media devices, not to
// start the media flow.
// The classes requesting new media streams are answered using
// MediaStreamManager::Listener.
class CONTENT_EXPORT MediaStreamManager
: public MediaStreamProviderListener,
public SettingsRequester {
public:
// This class takes the ownerships of the |audio_input_device_manager|
// and |video_capture_manager|.
MediaStreamManager(AudioInputDeviceManager* audio_input_device_manager,
VideoCaptureManager* video_capture_manager);
virtual ~MediaStreamManager();
// Used to access VideoCaptureManager.
VideoCaptureManager* video_capture_manager();
// Used to access AudioInputDeviceManager.
AudioInputDeviceManager* audio_input_device_manager();
// GenerateStream opens new media devices according to |components|. The
// request is identified using |label|, which is pointing to an already
// created std::string.
void GenerateStream(MediaStreamRequester* requester, int render_process_id,
int render_view_id, const StreamOptions& options,
const GURL& security_origin, std::string* label);
// Cancels all non-finished GenerateStream request, i.e. request for which
// StreamGenerated hasn't been called.
void CancelRequests(MediaStreamRequester* requester);
// Cancel generate stream.
void CancelGenerateStream(const std::string& label);
// Closes generated stream.
void StopGeneratedStream(const std::string& label);
// Gets a list of devices of |type|.
// The request is identified using |label|, which is pointing to a
// std::string.
void EnumerateDevices(MediaStreamRequester* requester,
int render_process_id,
int render_view_id,
MediaStreamType type,
const GURL& security_origin,
std::string* label);
// Open a device identified by |device_id|.
// The request is identified using |label|, which is pointing to a
// std::string.
void OpenDevice(MediaStreamRequester* requester,
int render_process_id,
int render_view_id,
const std::string& device_id,
MediaStreamType type,
const GURL& security_origin,
std::string* label);
// Implements MediaStreamProviderListener.
virtual void Opened(MediaStreamType stream_type,
int capture_session_id) OVERRIDE;
virtual void Closed(MediaStreamType stream_type,
int capture_session_id) OVERRIDE;
virtual void DevicesEnumerated(MediaStreamType stream_type,
const StreamDeviceInfoArray& devices) OVERRIDE;
virtual void Error(MediaStreamType stream_type,
int capture_session_id,
MediaStreamProviderError error) OVERRIDE;
// Implements SettingsRequester.
virtual void DevicesAccepted(const std::string& label,
const StreamDeviceInfoArray& devices) OVERRIDE;
virtual void SettingsError(const std::string& label) OVERRIDE;
// Used by unit test to make sure fake devices are used instead of a real
// devices, which is needed for server based testing.
// TODO(xians): Remove this hack since we can create our own
// MediaStreamManager in our unit tests.
void UseFakeDevice();
private:
// Contains all data needed to keep track of requests.
struct DeviceRequest;
// Helpers for signaling the media observer that new capture devices are
// opened/closed.
void NotifyObserverDevicesOpened(DeviceRequest* request);
void NotifyObserverDevicesClosed(DeviceRequest* request);
void DevicesFromRequest(DeviceRequest* request,
content::MediaStreamDevices* devices);
// Helpers.
bool RequestDone(const MediaStreamManager::DeviceRequest& request) const;
MediaStreamProvider* GetDeviceManager(MediaStreamType stream_type);
void StartEnumeration(DeviceRequest* new_request,
std::string* label);
// Helper to ensure the device thread and pass the message loop to device
// managers, it also register itself as the listener to the device managers.
void EnsureDeviceThreadAndListener();
// Device thread shared by VideoCaptureManager and AudioInputDeviceManager.
scoped_ptr<base::Thread> device_thread_;
scoped_ptr<MediaStreamDeviceSettings> device_settings_;
scoped_refptr<AudioInputDeviceManager> audio_input_device_manager_;
scoped_refptr<VideoCaptureManager> video_capture_manager_;
// Keeps track of device types currently being enumerated to not enumerate
// when not necessary.
std::vector<bool> enumeration_in_progress_;
// All non-closed request.
typedef std::map<std::string, DeviceRequest> DeviceRequests;
DeviceRequests requests_;
DISALLOW_COPY_AND_ASSIGN(MediaStreamManager);
};
} // namespace media_stream
#endif // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_MANAGER_H_
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