content/renderer/media/webrtc/video_destination_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_WEBRTC_VIDEO_DESTINATION_HANDLER_H_
   6 #define CONTENT_RENDERER_MEDIA_WEBRTC_VIDEO_DESTINATION_HANDLER_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "base/compiler_specific.h"
  12 #include "base/memory/weak_ptr.h"
  13 #include "content/common/content_export.h"
  14 #include "content/renderer/media/media_stream_video_source.h"
  15 #include "media/base/video_frame_pool.h"
  16
  17 namespace content {
  18
  19 class MediaStreamRegistryInterface;
  20 class PPB_ImageData_Impl;
  21
  22 // VideoDestinationHandler is a glue class between the content MediaStream and
  23 // the effects pepper plugin host.
  24 class CONTENT_EXPORT VideoDestinationHandler {
  25  public:
  26   // FrameWriterCallback is used to forward frames from the pepper host.
  27   // It must be invoked on the main render thread.
  28   typedef base::Callback<
  29       void(const scoped_refptr<PPB_ImageData_Impl>& frame,
  30            int64 time_stamp_ns)> FrameWriterCallback;
  31
  32   // Instantiates and adds a new video track to the MediaStream specified by
  33   // |url|. Returns a handler for delivering frames to the new video track as
  34   // |frame_writer|.
  35   // If |registry| is NULL the global blink::WebMediaStreamRegistry will be
  36   // used to look up the media stream.
  37   // Returns true on success and false on failure.
  38   static bool Open(MediaStreamRegistryInterface* registry,
  39                    const std::string& url,
  40                    FrameWriterCallback* frame_writer);
  41
  42  private:
  43   DISALLOW_COPY_AND_ASSIGN(VideoDestinationHandler);
  44 };
  45
  46 // PpFrameWriter implements MediaStreamVideoSource and can therefore provide
  47 // video frames to MediaStreamVideoTracks.
  48 class CONTENT_EXPORT PpFrameWriter
  49     : NON_EXPORTED_BASE(public MediaStreamVideoSource) {
  50  public:
  51   PpFrameWriter();
  52   virtual ~PpFrameWriter();
  53
  54   // Returns a callback that can be used for delivering frames to this
  55   // MediaStreamSource implementation.
  56   VideoDestinationHandler::FrameWriterCallback GetFrameWriterCallback();
  57
  58  protected:
  59   // MediaStreamVideoSource implementation.
  60   void GetCurrentSupportedFormats(
  61       int max_requested_width,
  62       int max_requested_height,
  63       double max_requested_frame_rate,
  64       const VideoCaptureDeviceFormatsCB& callback) override;
  65   void StartSourceImpl(
  66       const media::VideoCaptureFormat& format,
  67       const VideoCaptureDeliverFrameCB& frame_callback) override;
  68   void StopSourceImpl() override;
  69
  70  private:
  71   class FrameWriterDelegate;
  72   scoped_refptr<FrameWriterDelegate> delegate_;
  73
  74   DISALLOW_COPY_AND_ASSIGN(PpFrameWriter);
  75 };
  76
  77 }  // namespace content
  78
  79 #endif  // CONTENT_RENDERER_MEDIA_WEBRTC_VIDEO_DESTINATION_HANDLER_H_