text: /*
   *  Copyright (c) 2012 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 MODULES_RTP_RTCP_SOURCE_RTP_UTILITY_H_
  #define MODULES_RTP_RTCP_SOURCE_RTP_UTILITY_H_
  
  #include <stdint.h>
  
  #include <algorithm>
  
  #include "absl/strings/string_view.h"
  #include "api/rtp_headers.h"
  #include "modules/rtp_rtcp/include/rtp_header_extension_map.h"
  #include "modules/rtp_rtcp/include/rtp_rtcp_defines.h"
  
  namespace webrtc {
  
  const uint8_t kRtpMarkerBitMask = 0x80;
  
  namespace RtpUtility {
  
  // Round up to the nearest size that is a multiple of 4.
  size_t Word32Align(size_t size);
  
  class RtpHeaderParser {
   public:
    RtpHeaderParser(const uint8_t* rtpData, size_t rtpDataLength);
    ~RtpHeaderParser();
  
    bool RTCP() const;
    bool ParseRtcp(RTPHeader* header) const;
    bool Parse(RTPHeader* parsedPacket,
               const RtpHeaderExtensionMap* ptrExtensionMap = nullptr,
               bool header_only = false) const;
  
   private:
    void ParseOneByteExtensionHeader(RTPHeader* parsedPacket,
                                     const RtpHeaderExtensionMap* ptrExtensionMap,
                                     const uint8_t* ptrRTPDataExtensionEnd,
                                     const uint8_t* ptr) const;
  
    const uint8_t* const _ptrRTPDataBegin;
    const uint8_t* const _ptrRTPDataEnd;
  };
  }  // namespace RtpUtility
  }  // namespace webrtc
  
  #endif  // MODULES_RTP_RTCP_SOURCE_RTP_UTILITY_H_
  