content/renderer/pepper/pepper_media_stream_video_track_host.h

// Copyright 2014 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 CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_VIDEO_TRACK_HOST_H_
#define CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_VIDEO_TRACK_HOST_H_

#include <stdint.h>

#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "content/public/common/media_stream_request.h"
#include "content/public/renderer/media_stream_video_sink.h"
#include "content/renderer/pepper/pepper_media_stream_track_host_base.h"
#include "media/base/video_frame.h"
#include "ppapi/c/ppb_video_frame.h"
#include "ppapi/shared_impl/media_stream_video_track_shared.h"
#include "third_party/blink/public/platform/web_media_stream_track.h"
#include "ui/gfx/geometry/size.h"

namespace content {

class MediaStreamSource;

class PepperMediaStreamVideoTrackHost : public PepperMediaStreamTrackHostBase,
                                        public MediaStreamVideoSink {
 public:
  // Input mode constructor.
  // In input mode, this class passes video frames from |track| to the
  // associated pepper plugin.
  PepperMediaStreamVideoTrackHost(RendererPpapiHost* host,
                                  PP_Instance instance,
                                  PP_Resource resource,
                                  const blink::WebMediaStreamTrack& track);

  // Output mode constructor.
  // In output mode, this class passes video frames from the associated
  // pepper plugin to a newly created blink::WebMediaStreamTrack.
  PepperMediaStreamVideoTrackHost(RendererPpapiHost* host,
                                  PP_Instance instance,
                                  PP_Resource resource);

  ~PepperMediaStreamVideoTrackHost() override;

  bool IsMediaStreamVideoTrackHost() override;

  blink::WebMediaStreamTrack track() { return track_; }

 private:
  // Implements a MediaStreamVideoSource that drives this host (output mode
  // only). VideoSource holds a weak reference to the host, and sets/clears
  // |frame_deliverer_|.
  class VideoSource;

  void InitBuffers();

  // PepperMediaStreamTrackHostBase overrides:
  void OnClose() override;
  int32_t OnHostMsgEnqueueBuffer(ppapi::host::HostMessageContext* context,
                                 int32_t index) override;

  // Sends frame with |index| to |track_|.
  int32_t SendFrameToTrack(int32_t index);

  void OnVideoFrame(const scoped_refptr<media::VideoFrame>& frame,
                    base::TimeTicks estimated_capture_time);

  // ResourceHost overrides:
  void DidConnectPendingHostToResource() override;

  // ResourceMessageHandler overrides:
  int32_t OnResourceMessageReceived(
      const IPC::Message& msg,
      ppapi::host::HostMessageContext* context) override;

  // Message handlers:
  int32_t OnHostMsgConfigure(
      ppapi::host::HostMessageContext* context,
      const ppapi::MediaStreamVideoTrackShared::Attributes& attributes);

  void InitBlinkTrack();
  void OnTrackStarted(MediaStreamSource* source,
                      MediaStreamRequestResult result,
                      const blink::WebString& result_name);

  blink::WebMediaStreamTrack track_;

  // Number of buffers.
  int32_t number_of_buffers_;

  // Size of frames which are received from MediaStreamVideoSink.
  gfx::Size source_frame_size_;

  // Plugin specified frame size.
  gfx::Size plugin_frame_size_;

  // Format of frames which are received from MediaStreamVideoSink.
  PP_VideoFrame_Format source_frame_format_;

  // Plugin specified frame format.
  PP_VideoFrame_Format plugin_frame_format_;

  // The size of frame pixels in bytes.
  uint32_t frame_data_size_;

  // TODO(ronghuawu): Remove |type_| and split PepperMediaStreamVideoTrackHost
  // into 2 classes for read and write.
  TrackType type_;

  // Internal class used for delivering video frames on the IO-thread to
  // the MediaStreamVideoSource implementation.
  class FrameDeliverer;
  scoped_refptr<FrameDeliverer> frame_deliverer_;

  base::WeakPtrFactory<PepperMediaStreamVideoTrackHost> weak_factory_;

  DISALLOW_COPY_AND_ASSIGN(PepperMediaStreamVideoTrackHost);
};

}  // namespace content

#endif  // CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_VIDEO_TRACK_HOST_H_