Implement WiFi Display media packetizer.

extensions/renderer/api/display_source/wifi_display/wifi_display_media_packetizer.h

+// Copyright 2016 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 EXTENSIONS_RENDERER_API_DISPLAY_SOURCE_WIFI_DISPLAY_WIFI_DISPLAY_MEDIA_PACKETIZER_H_
+#define EXTENSIONS_RENDERER_API_DISPLAY_SOURCE_WIFI_DISPLAY_WIFI_DISPLAY_MEDIA_PACKETIZER_H_
+
+#include <vector>
+
+#include "base/callback.h"
+#include "base/move.h"
+#include "extensions/renderer/api/display_source/wifi_display/wifi_display_transport_stream_packetizer.h"
+
+namespace extensions {
+
+// This class represents an RTP datagram packet containing MPEG Transport
+// Stream (MPEG-TS) packets as a payload.
+class WiFiDisplayMediaDatagramPacket : public std::vector<uint8_t> {
+ public:
+  WiFiDisplayMediaDatagramPacket();
+  WiFiDisplayMediaDatagramPacket(WiFiDisplayMediaDatagramPacket&&);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN_WITH_MOVE_FOR_BIND(WiFiDisplayMediaDatagramPacket);
+};
+
+// The WiFi Display media packetizer packetizes unit buffers to media datagram
+// packets containing MPEG Transport Stream (MPEG-TS) packets containing either
+// meta information or Packetized Elementary Stream (PES) packets  containing
+// unit data.
+//
+// Whenever a media datagram packet is fully created and thus ready for further
+// processing, a callback is called.
+class WiFiDisplayMediaPacketizer : public WiFiDisplayTransportStreamPacketizer {
+ public:
+  using PacketizedCallback =
+      base::Callback<bool(WiFiDisplayMediaDatagramPacket)>;
+
+  WiFiDisplayMediaPacketizer(
+      const base::TimeDelta& delay_for_unit_time_stamps,
+      std::vector<WiFiDisplayElementaryStreamInfo> stream_infos,
+      const PacketizedCallback& on_packetized);
+  ~WiFiDisplayMediaPacketizer() override;
+
+ protected:
+  bool OnPacketizedTransportStreamPacket(
+      const WiFiDisplayTransportStreamPacket& transport_stream_packet,
+      bool flush) override;
+
+ private:
+  using SourceIdentifier = uint8_t[4];
+
+  WiFiDisplayMediaDatagramPacket media_datagram_packet_;
+  PacketizedCallback on_packetized_media_datagram_packet_;
+  uint16_t sequence_number_;
+  SourceIdentifier synchronization_source_identifier_;
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_RENDERER_API_DISPLAY_SOURCE_WIFI_DISPLAY_WIFI_DISPLAY_MEDIA_PACKETIZER_H_