Cast: IPC glue between cast library transport and encoders.

chrome/renderer/media/cast_transport_sender_ipc.h

+// Copyright (c) 2013 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 CHROME_RENDERER_MEDIA_CAST_TRANSPORT_SENDER_IPC_H_
+#define CHROME_RENDERER_MEDIA_CAST_TRANSPORT_SENDER_IPC_H_
+
+#include "base/callback.h"
+#include "base/id_map.h"
+#include "content/common/cast_messages.h"
+#include "ipc/ipc_channel_proxy.h"
+#include "media/cast/cast_sender.h"
+#include "media/cast/transport/cast_transport_sender.h"
+
+namespace cast {
+
+class CastIPCDispatcher;
+
+// This implementation of the CastTransportSender interface
+// communicates with the browser process over IPC and relays
+// all calls to/from the transport sender to the browser process.
+// The primary reason for this arrangement is to give the
+// renderer less direct control over the UDP sockets.
+class CastTransportSenderIPC
+    : public media::cast::transport::CastTransportSender {
+ public:
+  CastTransportSenderIPC(
+      const media::cast::transport::CastTransportConfig& config,
+      const media::cast::transport::CastTransportStatusCallback& status_cb);
+  virtual ~CastTransportSenderIPC();
+
+  // media::cast::transport::CastTransportSender implementation
+  virtual void SetPacketReceiver(
+      const media::cast::transport::PacketReceiverCallback& packet_callback)
+      OVERRIDE;
+  virtual void InsertCodedAudioFrame(
+      const media::cast::transport::EncodedAudioFrame* audio_frame,
+      const base::TimeTicks& recorded_time) OVERRIDE;
+  virtual void InsertCodedVideoFrame(
+      const media::cast::transport::EncodedVideoFrame* video_frame,
+      const base::TimeTicks& capture_time) OVERRIDE;
+
+  virtual void SendRtcpFromRtpSender(
+      uint32 packet_type_flags,
+      const media::cast::transport::RtcpSenderInfo& sender_info,
+      const media::cast::transport::RtcpDlrrReportBlock& dlrr,
+      const media::cast::transport::RtcpSenderLogMessage& sender_log,
+      uint32 sending_ssrc,
+      const std::string& c_name) OVERRIDE;
+
+  // Retransmission request.
+  virtual void ResendPackets(
+      bool is_audio,
+      const media::cast::MissingFramesAndPacketsMap& missing_packets) OVERRIDE;
+
+  // Retrieves audio RTP statistics.
+  virtual void RtpAudioStatistics(
+      const base::TimeTicks& now,
+      media::cast::transport::RtcpSenderInfo* sender_info) OVERRIDE;
+
+  // Retrieves video RTP statistics.
+  virtual void RtpVideoStatistics(
+      const base::TimeTicks& now,
+      media::cast::transport::RtcpSenderInfo* sender_info) OVERRIDE;
+
+ private:
+  bool Send(IPC::Message *message);
+
+  friend class CastIPCDispatcher;
+  int32 channel_id_;
+  media::cast::transport::PacketReceiverCallback packet_callback_;
+  media::cast::transport::CastTransportStatusCallback status_callback_;
+  DISALLOW_COPY_AND_ASSIGN(CastTransportSenderIPC);
+};
+
+// This dispatcher listens to incoming IPC messages and sends
+// the call to the correct CastTransportSenderIPC instance.
+class CastIPCDispatcher : public IPC::ChannelProxy::MessageFilter {
+ public:
+  explicit CastIPCDispatcher(
+      const scoped_refptr<base::MessageLoopProxy>& io_message_loop);
+
+  // IPC::ChannelProxy::MessageFilter implementation
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+  virtual void OnFilterAdded(IPC::Channel* channel) OVERRIDE;
+  virtual void OnFilterRemoved() OVERRIDE;
+  virtual void OnChannelClosing() OVERRIDE;
+
+ protected:
+  virtual ~CastIPCDispatcher();
+
+ private:
+  void OnReceivedPacket(int32 channel_id, const media::cast::Packet& packet);
+  void OnNotifyStatusChange(
+      int32 channel_id,
+      media::cast::transport::CastTransportStatus status);
+
+  friend CastTransportSenderIPC;
+  static CastIPCDispatcher* global_instance_;
+
+  // IPC channel for Send(); must only be accesed on |io_message_loop_|.
+  IPC::Channel* channel_;
+
+  // Message loop on which IPC calls are driven.
+  const scoped_refptr<base::MessageLoopProxy> io_message_loop_;
+
+  // A map of stream ids to delegates; must only be accessed on
+  // |io_message_loop_|.
+  IDMap<CastTransportSenderIPC> id_map_;
+  DISALLOW_COPY_AND_ASSIGN(CastIPCDispatcher);
+};
+
+}  // namespace cast
+
+#endif  // CHROME_RENDERER_MEDIA_CAST_TRANSPORT_SENDER_IPC_H_