[rtp_rtcp] rtcp::Sdes cleaned and got Parse function

webrtc/modules/rtp_rtcp/source/rtcp_packet/sdes.h

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
- *
  */
 
 #ifndef WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_SDES_H_
 #define WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_SDES_H_
 
 #include <string>
 #include <vector>
 
 #include "webrtc/base/basictypes.h"
 #include "webrtc/modules/rtp_rtcp/source/rtcp_packet.h"
 #include "webrtc/modules/rtp_rtcp/source/rtcp_utility.h"
 
 namespace webrtc {
 namespace rtcp {
 // Source Description (SDES) (RFC 3550).
 class Sdes : public RtcpPacket {
  public:
-  Sdes() : RtcpPacket() {}
+  struct Chunk {
+    uint32_t ssrc;
+    std::string cname;
+  };
+  static const uint8_t kPacketType = 202;
 
-  virtual ~Sdes() {}
+  Sdes();
+  ~Sdes() override;
+
+  // Parse assumes header is already parsed and validated.
+  bool Parse(const RTCPUtility::RtcpCommonHeader& header,
+             const uint8_t* payload);  // Size of the payload is in the header.
 
   bool WithCName(uint32_t ssrc, const std::string& cname);
 
-  struct Chunk {
-    uint32_t ssrc;
-    std::string name;
-    int null_octets;
-  };
+  const std::vector<Chunk>& chunks() const { return chunks_; }
+
+  size_t BlockLength() const override { return block_length_; }
 
  protected:
   bool Create(uint8_t* packet,
               size_t* index,
               size_t max_length,
               RtcpPacket::PacketReadyCallback* callback) const override;
 
  private:
-  static const int kMaxNumberOfChunks = 0x1f;
-
-  size_t BlockLength() const;
+  static const size_t kMaxNumberOfChunks = 0x1f;
 
   std::vector<Chunk> chunks_;
+  size_t block_length_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(Sdes);
 };
 }  // namespace rtcp
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_SDES_H_