Implement WiFi Display elementary stream packetizer.

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

Index: extensions/renderer/api/display_source/wifi_display/wifi_display_elementary_stream_packetizer.h
diff --git a/extensions/renderer/api/display_source/wifi_display/wifi_display_elementary_stream_packetizer.h b/extensions/renderer/api/display_source/wifi_display/wifi_display_elementary_stream_packetizer.h
new file mode 100644
index 0000000000000000000000000000000000000000..4201a58287daf9657a594cfcb6815f2e1c659e69
--- /dev/null
+++ b/extensions/renderer/api/display_source/wifi_display/wifi_display_elementary_stream_packetizer.h
@@ -0,0 +1,72 @@
+// 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_ELEMENTARY_STREAM_PACKETIZER_H_
+#define EXTENSIONS_RENDERER_API_DISPLAY_SOURCE_WIFI_DISPLAY_WIFI_DISPLAY_ELEMENTARY_STREAM_PACKETIZER_H_
+
+#include "base/time/time.h"
+#include "extensions/renderer/api/display_source/wifi_display/wifi_display_stream_packet_part.h"
+
+namespace extensions {
+
+// WiFi Display elementary stream packet represents a Packetized Elementary
+// Stream (PES) packet containing WiFi Display elementary stream unit data.
+class WiFiDisplayElementaryStreamPacket {
+ public:
+  using HeaderBuffer = uint8_t[19];
+
+  WiFiDisplayElementaryStreamPacket(const HeaderBuffer& header_data,
+                                    size_t header_size,
+                                    const uint8_t* unit_header_data,
+                                    size_t unit_header_size,
+                                    const uint8_t* unit_data,
+                                    size_t unit_size);
+  // WiFiDisplayElementaryStreamPacketizer::EncodeElementaryStreamUnit returns
+  // WiFiDisplayElementaryStreamPacket so WiFiDisplayElementaryStreamPacket
+  // must be move constructible (as it is not copy constructible).
+  // A compiler should however use return value optimization and elide each
+  // call to this move constructor.
+  WiFiDisplayElementaryStreamPacket(WiFiDisplayElementaryStreamPacket&& other);
+
+  const WiFiDisplayStreamPacketPart& header() const { return header_; }
+  const WiFiDisplayStreamPacketPart& unit_header() const {
+    return unit_header_;
+  }
+  const WiFiDisplayStreamPacketPart& unit() const { return unit_; }
+
+ private:
+  HeaderBuffer header_buffer_;
+  WiFiDisplayStreamPacketPart header_;
+  WiFiDisplayStreamPacketPart unit_header_;
+  WiFiDisplayStreamPacketPart unit_;
+
+  DISALLOW_COPY_AND_ASSIGN(WiFiDisplayElementaryStreamPacket);
+};
+
+// The WiFi Display elementary stream packetizer packetizes unit buffers to
+// Packetized Elementary Stream (PES) packets.
+// It is used internally by a WiFi Display transport stream packetizer.
+class WiFiDisplayElementaryStreamPacketizer {
+ public:
+  enum : uint8_t {
+    kPrivateStream1Id = 0xBDu,
+    kFirstAudioStreamId = 0xC0u,
+    kLastAudioStreamId = 0xDFu,
+    kFirstVideoStreamId = 0xE0u,
+    kLastVideoStreamId = 0xEFu,
+  };
+
+  static WiFiDisplayElementaryStreamPacket EncodeElementaryStreamUnit(
+      uint8_t stream_id,
+      const uint8_t* unit_header_data,
+      size_t unit_header_size,
+      const uint8_t* unit_data,
+      size_t unit_size,
+      const base::TimeTicks& pts,
+      const base::TimeTicks& dts);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_RENDERER_API_DISPLAY_SOURCE_WIFI_DISPLAY_WIFI_DISPLAY_ELEMENTARY_STREAM_PACKETIZER_H_