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      1 /*
      2  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
      3  *
      4  *  Use of this source code is governed by a BSD-style license
      5  *  that can be found in the LICENSE file in the root of the source
      6  *  tree. An additional intellectual property rights grant can be found
      7  *  in the file PATENTS.  All contributing project authors may
      8  *  be found in the AUTHORS file in the root of the source tree.
      9  */
     10 
     11 #ifndef WEBRTC_MODULES_RTP_RTCP_SOURCE_RTP_UTILITY_H_
     12 #define WEBRTC_MODULES_RTP_RTCP_SOURCE_RTP_UTILITY_H_
     13 
     14 #include <map>
     15 
     16 #include "webrtc/base/deprecation.h"
     17 #include "webrtc/modules/rtp_rtcp/include/receive_statistics.h"
     18 #include "webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h"
     19 #include "webrtc/modules/rtp_rtcp/source/rtp_header_extension.h"
     20 #include "webrtc/modules/rtp_rtcp/source/rtp_rtcp_config.h"
     21 #include "webrtc/typedefs.h"
     22 
     23 namespace webrtc {
     24 
     25 const uint8_t kRtpMarkerBitMask = 0x80;
     26 
     27 RtpData* NullObjectRtpData();
     28 RtpFeedback* NullObjectRtpFeedback();
     29 RtpAudioFeedback* NullObjectRtpAudioFeedback();
     30 ReceiveStatistics* NullObjectReceiveStatistics();
     31 
     32 namespace RtpUtility {
     33 
     34 struct Payload {
     35   char name[RTP_PAYLOAD_NAME_SIZE];
     36   bool audio;
     37   PayloadUnion typeSpecific;
     38 };
     39 
     40 typedef std::map<int8_t, Payload*> PayloadTypeMap;
     41 
     42 bool StringCompare(const char* str1, const char* str2, const uint32_t length);
     43 
     44 // Round up to the nearest size that is a multiple of 4.
     45 size_t Word32Align(size_t size);
     46 
     47 class RtpHeaderParser {
     48  public:
     49   RtpHeaderParser(const uint8_t* rtpData, size_t rtpDataLength);
     50   ~RtpHeaderParser();
     51 
     52   bool RTCP() const;
     53   bool ParseRtcp(RTPHeader* header) const;
     54   bool Parse(RTPHeader* parsedPacket,
     55              RtpHeaderExtensionMap* ptrExtensionMap = nullptr) const;
     56   RTC_DEPRECATED bool Parse(
     57       RTPHeader& parsedPacket,  // NOLINT(runtime/references)
     58       RtpHeaderExtensionMap* ptrExtensionMap = nullptr) const {
     59     return Parse(&parsedPacket, ptrExtensionMap);
     60   }
     61 
     62  private:
     63   void ParseOneByteExtensionHeader(RTPHeader* parsedPacket,
     64                                    const RtpHeaderExtensionMap* ptrExtensionMap,
     65                                    const uint8_t* ptrRTPDataExtensionEnd,
     66                                    const uint8_t* ptr) const;
     67 
     68   uint8_t ParsePaddingBytes(const uint8_t* ptrRTPDataExtensionEnd,
     69                             const uint8_t* ptr) const;
     70 
     71   const uint8_t* const _ptrRTPDataBegin;
     72   const uint8_t* const _ptrRTPDataEnd;
     73 };
     74 }  // namespace RtpUtility
     75 }  // namespace webrtc
     76 
     77 #endif  // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTP_UTILITY_H_
     78