content/renderer/media/video_source_handler.h

   1 // Copyright (c) 2013 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_VIDEO_SOURCE_HANDLER_H_
   6 #define CONTENT_RENDERER_MEDIA_VIDEO_SOURCE_HANDLER_H_
   7
   8 #include <map>
   9 #include <string>
  10
  11 #include "base/compiler_specific.h"
  12 #include "base/gtest_prod_util.h"
  13 #include "base/memory/ref_counted.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/threading/thread_checker.h"
  16 #include "content/common/content_export.h"
  17 #include "media/base/video_frame.h"
  18 #include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
  19
  20 namespace content {
  21
  22 class MediaStreamRegistryInterface;
  23 class MediaStreamVideoSink;
  24 class PpFrameReceiver;
  25
  26 // Interface used by the effects pepper plugin to get captured frame
  27 // from the video track.
  28 class CONTENT_EXPORT FrameReaderInterface {
  29  public:
  30   // Got a new captured frame.
  31   virtual void GotFrame(const scoped_refptr<media::VideoFrame>& frame) = 0;
  32
  33  protected:
  34   virtual ~FrameReaderInterface() {}
  35 };
  36
  37 // VideoSourceHandler is a glue class between MediaStreamVideoTrack and
  38 // the effects pepper plugin host.
  39 class CONTENT_EXPORT VideoSourceHandler {
  40  public:
  41   // |registry| is used to look up the media stream by url. If a NULL |registry|
  42   // is given, the global blink::WebMediaStreamRegistry will be used.
  43   explicit VideoSourceHandler(MediaStreamRegistryInterface* registry);
  44   virtual ~VideoSourceHandler();
  45   // Connects to the first video track in the MediaStream specified by |url| and
  46   // the received frames will be delivered via |reader|.
  47   // Returns true on success and false on failure.
  48   bool Open(const std::string& url, FrameReaderInterface* reader);
  49   // Closes |reader|'s connection with the video track, i.e. stops receiving
  50   // frames from the video track.
  51   // Returns true on success and false on failure.
  52   bool Close(FrameReaderInterface* reader);
  53
  54  private:
  55   FRIEND_TEST_ALL_PREFIXES(VideoSourceHandlerTest, OpenClose);
  56
  57   struct SourceInfo {
  58     SourceInfo(const blink::WebMediaStreamTrack& blink_track,
  59                FrameReaderInterface* reader);
  60     ~SourceInfo();
  61
  62     scoped_ptr<PpFrameReceiver> receiver_;
  63   };
  64
  65   typedef std::map<FrameReaderInterface*, SourceInfo*> SourceInfoMap;
  66
  67   // Deliver VideoFrame to the MediaStreamVideoSink associated with
  68   // |reader|. For testing only.
  69   void DeliverFrameForTesting(FrameReaderInterface* reader,
  70                               const scoped_refptr<media::VideoFrame>& frame);
  71
  72   blink::WebMediaStreamTrack GetFirstVideoTrack(const std::string& url);
  73
  74   MediaStreamRegistryInterface* registry_;
  75   SourceInfoMap reader_to_receiver_;
  76
  77   base::ThreadChecker thread_checker_;
  78
  79   DISALLOW_COPY_AND_ASSIGN(VideoSourceHandler);
  80 };
  81
  82 }  // namespace content
  83
  84 #endif  // CONTENT_RENDERER_MEDIA_VIDEO_SOURCE_HANDLER_H_