src/content/renderer/media/media_stream_impl.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_RENDERER_MEDIA_MEDIA_STREAM_IMPL_H_
   6 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_IMPL_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "base/basictypes.h"
  12 #include "base/compiler_specific.h"
  13 #include "base/memory/ref_counted.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/memory/scoped_vector.h"
  16 #include "base/memory/weak_ptr.h"
  17 #include "base/threading/non_thread_safe.h"
  18 #include "content/common/content_export.h"
  19 #include "content/public/renderer/render_frame_observer.h"
  20 #include "content/renderer/media/media_stream_dispatcher_eventhandler.h"
  21 #include "content/renderer/media/media_stream_source.h"
  22 #include "third_party/WebKit/public/platform/WebMediaStream.h"
  23 #include "third_party/WebKit/public/platform/WebMediaStreamSource.h"
  24 #include "third_party/WebKit/public/platform/WebVector.h"
  25 #include "third_party/WebKit/public/web/WebMediaDevicesRequest.h"
  26 #include "third_party/WebKit/public/web/WebUserMediaClient.h"
  27 #include "third_party/WebKit/public/web/WebUserMediaRequest.h"
  28 #include "third_party/libjingle/source/talk/app/webrtc/mediastreaminterface.h"
  29
  30 namespace content {
  31 class PeerConnectionDependencyFactory;
  32 class MediaStreamDispatcher;
  33 class MediaStreamVideoSource;
  34 class VideoCapturerDelegate;
  35
  36 // MediaStreamImpl is a delegate for the Media Stream GetUserMedia API.
  37 // It ties together WebKit and MediaStreamManager
  38 // (via MediaStreamDispatcher and MediaStreamDispatcherHost)
  39 // in the browser process. It must be created, called and destroyed on the
  40 // render thread.
  41 class CONTENT_EXPORT MediaStreamImpl
  42     : public RenderFrameObserver,
  43       NON_EXPORTED_BASE(public blink::WebUserMediaClient),
  44       public MediaStreamDispatcherEventHandler,
  45       NON_EXPORTED_BASE(public base::NonThreadSafe) {
  46  public:
  47   // |render_frame| and |dependency_factory| must outlive this instance.
  48   MediaStreamImpl(
  49       RenderFrame* render_frame,
  50       PeerConnectionDependencyFactory* dependency_factory,
  51       scoped_ptr<MediaStreamDispatcher> media_stream_dispatcher);
  52   virtual ~MediaStreamImpl();
  53
  54   MediaStreamDispatcher* media_stream_dispatcher() const {
  55     return media_stream_dispatcher_.get();
  56   }
  57
  58   // blink::WebUserMediaClient implementation
  59   virtual void requestUserMedia(
  60       const blink::WebUserMediaRequest& user_media_request);
  61   virtual void cancelUserMediaRequest(
  62       const blink::WebUserMediaRequest& user_media_request);
  63   virtual void requestMediaDevices(
  64       const blink::WebMediaDevicesRequest& media_devices_request) OVERRIDE;
  65   virtual void cancelMediaDevicesRequest(
  66       const blink::WebMediaDevicesRequest& media_devices_request) OVERRIDE;
  67
  68   // MediaStreamDispatcherEventHandler implementation.
  69   virtual void OnStreamGenerated(
  70       int request_id,
  71       const std::string& label,
  72       const StreamDeviceInfoArray& audio_array,
  73       const StreamDeviceInfoArray& video_array) OVERRIDE;
  74   virtual void OnStreamGenerationFailed(
  75       int request_id,
  76       MediaStreamRequestResult result) OVERRIDE;
  77   virtual void OnDeviceStopped(const std::string& label,
  78                                const StreamDeviceInfo& device_info) OVERRIDE;
  79   virtual void OnDevicesEnumerated(
  80       int request_id,
  81       const StreamDeviceInfoArray& device_array) OVERRIDE;
  82   virtual void OnDeviceOpened(
  83       int request_id,
  84       const std::string& label,
  85       const StreamDeviceInfo& device_info) OVERRIDE;
  86   virtual void OnDeviceOpenFailed(int request_id) OVERRIDE;
  87
  88   // RenderFrameObserver OVERRIDE
  89   virtual void FrameWillClose() OVERRIDE;
  90
  91  protected:
  92   // Called when |source| has been stopped from JavaScript.
  93   void OnLocalSourceStopped(const blink::WebMediaStreamSource& source);
  94
  95   // These methods are virtual for test purposes. A test can override them to
  96   // test requesting local media streams. The function notifies WebKit that the
  97   // |request| have completed.
  98   virtual void GetUserMediaRequestSucceeded(
  99        const blink::WebMediaStream& stream,
 100        blink::WebUserMediaRequest* request_info);
 101   virtual void GetUserMediaRequestFailed(
 102       blink::WebUserMediaRequest* request_info,
 103       MediaStreamRequestResult result);
 104   virtual void GetUserMediaRequestTrackStartedFailed(
 105       blink::WebUserMediaRequest* request_info,
 106       MediaStreamRequestResult result,
 107       const blink::WebString& result_name);
 108   virtual void EnumerateDevicesSucceded(
 109       blink::WebMediaDevicesRequest* request,
 110       blink::WebVector<blink::WebMediaDeviceInfo>& devices);
 111   // Creates a MediaStreamVideoSource object.
 112   // This is virtual for test purposes.
 113   virtual MediaStreamVideoSource* CreateVideoSource(
 114       const StreamDeviceInfo& device,
 115       const MediaStreamSource::SourceStoppedCallback& stop_callback);
 116
 117  private:
 118   // Class for storing information about a WebKit request to create a
 119   // MediaStream.
 120   class UserMediaRequestInfo
 121       : public base::SupportsWeakPtr<UserMediaRequestInfo> {
 122    public:
 123     typedef base::Callback<void(UserMediaRequestInfo* request_info,
 124                                 MediaStreamRequestResult result,
 125                                 const blink::WebString& result_name)>
 126       ResourcesReady;
 127
 128     UserMediaRequestInfo(int request_id,
 129                          const blink::WebUserMediaRequest& request,
 130                          bool enable_automatic_output_device_selection);
 131     ~UserMediaRequestInfo();
 132     int request_id;
 133     // True if MediaStreamDispatcher has generated the stream, see
 134     // OnStreamGenerated.
 135     bool generated;
 136     const bool enable_automatic_output_device_selection;
 137     blink::WebMediaStream web_stream;
 138     blink::WebUserMediaRequest request;
 139
 140     void StartAudioTrack(const blink::WebMediaStreamTrack& track,
 141                          const blink::WebMediaConstraints& constraints);
 142
 143     blink::WebMediaStreamTrack CreateAndStartVideoTrack(
 144         const blink::WebMediaStreamSource& source,
 145         const blink::WebMediaConstraints& constraints);
 146
 147     // Triggers |callback| when all sources used in this request have either
 148     // successfully started, or a source has failed to start.
 149     void CallbackOnTracksStarted(const ResourcesReady& callback);
 150
 151     bool IsSourceUsed(const blink::WebMediaStreamSource& source) const;
 152     void RemoveSource(const blink::WebMediaStreamSource& source);
 153
 154     bool HasPendingSources() const;
 155
 156    private:
 157     void OnTrackStarted(
 158         MediaStreamSource* source,
 159         MediaStreamRequestResult result,
 160         const blink::WebString& result_name);
 161     void CheckAllTracksStarted();
 162
 163     ResourcesReady ready_callback_;
 164     MediaStreamRequestResult request_result_;
 165     blink::WebString request_result_name_;
 166     // Sources used in this request.
 167     std::vector<blink::WebMediaStreamSource> sources_;
 168     std::vector<MediaStreamSource*> sources_waiting_for_callback_;
 169   };
 170   typedef ScopedVector<UserMediaRequestInfo> UserMediaRequests;
 171
 172   typedef std::vector<blink::WebMediaStreamSource> LocalStreamSources;
 173
 174   struct MediaDevicesRequestInfo;
 175   typedef ScopedVector<MediaDevicesRequestInfo> MediaDevicesRequests;
 176
 177   // Creates a WebKit representation of stream sources based on
 178   // |devices| from the MediaStreamDispatcher.
 179   void InitializeSourceObject(
 180       const StreamDeviceInfo& device,
 181       blink::WebMediaStreamSource::Type type,
 182       const blink::WebMediaConstraints& constraints,
 183       blink::WebMediaStreamSource* webkit_source);
 184
 185   void CreateVideoTracks(
 186       const StreamDeviceInfoArray& devices,
 187       const blink::WebMediaConstraints& constraints,
 188       blink::WebVector<blink::WebMediaStreamTrack>* webkit_tracks,
 189       UserMediaRequestInfo* request);
 190
 191   void CreateAudioTracks(
 192       const StreamDeviceInfoArray& devices,
 193       const blink::WebMediaConstraints& constraints,
 194       blink::WebVector<blink::WebMediaStreamTrack>* webkit_tracks,
 195       UserMediaRequestInfo* request);
 196
 197   // Callback function triggered when all native versions of the
 198   // underlying media sources and tracks have been created and started.
 199   void OnCreateNativeTracksCompleted(
 200       UserMediaRequestInfo* request,
 201       MediaStreamRequestResult result,
 202       const blink::WebString& result_name);
 203
 204   void OnStreamGeneratedForCancelledRequest(
 205       const StreamDeviceInfoArray& audio_array,
 206       const StreamDeviceInfoArray& video_array);
 207
 208   UserMediaRequestInfo* FindUserMediaRequestInfo(int request_id);
 209   UserMediaRequestInfo* FindUserMediaRequestInfo(
 210       const blink::WebUserMediaRequest& request);
 211   void DeleteUserMediaRequestInfo(UserMediaRequestInfo* request);
 212   void DeleteAllUserMediaRequests();
 213
 214   MediaDevicesRequestInfo* FindMediaDevicesRequestInfo(int request_id);
 215   MediaDevicesRequestInfo* FindMediaDevicesRequestInfo(
 216       const blink::WebMediaDevicesRequest& request);
 217   void CancelAndDeleteMediaDevicesRequest(MediaDevicesRequestInfo* request);
 218
 219   // Returns the source that use a device with |device.session_id|
 220   // and |device.device.id|. NULL if such source doesn't exist.
 221   const blink::WebMediaStreamSource* FindLocalSource(
 222       const StreamDeviceInfo& device) const;
 223
 224   void StopLocalSource(const blink::WebMediaStreamSource& source,
 225                        bool notify_dispatcher);
 226
 227   // Weak ref to a PeerConnectionDependencyFactory, owned by the RenderThread.
 228   // It's valid for the lifetime of RenderThread.
 229   // TODO(xians): Remove this dependency once audio do not need it for local
 230   // audio.
 231   PeerConnectionDependencyFactory* const dependency_factory_;
 232
 233   // MediaStreamImpl owns MediaStreamDispatcher instead of RenderFrameImpl
 234   // (or RenderFrameObserver) to ensure tear-down occurs in the right order.
 235   const scoped_ptr<MediaStreamDispatcher> media_stream_dispatcher_;
 236
 237   LocalStreamSources local_sources_;
 238
 239   UserMediaRequests user_media_requests_;
 240
 241   // Requests to enumerate media devices.
 242   MediaDevicesRequests media_devices_requests_;
 243
 244   // Note: This member must be the last to ensure all outstanding weak pointers
 245   // are invalidated first.
 246   base::WeakPtrFactory<MediaStreamImpl> weak_factory_;
 247
 248   DISALLOW_COPY_AND_ASSIGN(MediaStreamImpl);
 249 };
 250
 251 }  // namespace content
 252
 253 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_IMPL_H_