1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef MEDIA_CAST_RTCP_RTCP_UTILITY_H_ 6 #define MEDIA_CAST_RTCP_RTCP_UTILITY_H_ 7 8 #include "base/big_endian.h" 9 #include "media/cast/cast_config.h" 10 #include "media/cast/cast_defines.h" 11 #include "media/cast/logging/logging_defines.h" 12 #include "media/cast/net/rtcp/rtcp_defines.h" 13 14 namespace media { 15 namespace cast { 16 17 // RFC 3550 page 44, including end null. 18 static const size_t kRtcpCnameSize = 256; 19 20 static const uint32 kCast = ('C' << 24) + ('A' << 16) + ('S' << 8) + 'T'; 21 22 static const uint8 kReceiverLogSubtype = 2; 23 24 static const size_t kRtcpMaxReceiverLogMessages = 256; 25 static const size_t kRtcpMaxCastLossFields = 100; 26 27 struct RtcpCommonHeader { 28 uint8 V; // Version. 29 bool P; // Padding. 30 uint8 IC; // Item count / subtype. 31 uint8 PT; // Packet Type. 32 size_t length_in_octets; 33 }; 34 35 class RtcpParser { 36 public: 37 RtcpParser(uint32 local_ssrc, uint32 remote_ssrc); 38 ~RtcpParser(); 39 40 bool Parse(base::BigEndianReader* reader); 41 has_sender_report()42 bool has_sender_report() const { return has_sender_report_; } sender_report()43 const RtcpSenderInfo& sender_report() const { 44 return sender_report_; 45 } 46 has_last_report()47 bool has_last_report() const { return has_last_report_; } last_report()48 uint32 last_report() const { return last_report_; } delay_since_last_report()49 uint32 delay_since_last_report() const { return delay_since_last_report_; } 50 has_receiver_log()51 bool has_receiver_log() const { return !receiver_log_.empty(); } receiver_log()52 const RtcpReceiverLogMessage& receiver_log() const { return receiver_log_; } mutable_receiver_log()53 RtcpReceiverLogMessage* mutable_receiver_log() { return & receiver_log_; } 54 has_cast_message()55 bool has_cast_message() const { return has_cast_message_; } cast_message()56 const RtcpCastMessage& cast_message() const { return cast_message_; } mutable_cast_message()57 RtcpCastMessage* mutable_cast_message() { return &cast_message_; } 58 has_receiver_reference_time_report()59 bool has_receiver_reference_time_report() const { 60 return has_receiver_reference_time_report_; 61 } 62 const RtcpReceiverReferenceTimeReport& receiver_reference_time_report()63 receiver_reference_time_report() const { 64 return receiver_reference_time_report_; 65 } 66 67 private: 68 bool ParseCommonHeader(base::BigEndianReader* reader, 69 RtcpCommonHeader* parsed_header); 70 bool ParseSR(base::BigEndianReader* reader, 71 const RtcpCommonHeader& header); 72 bool ParseRR(base::BigEndianReader* reader, 73 const RtcpCommonHeader& header); 74 bool ParseReportBlock(base::BigEndianReader* reader); 75 bool ParseApplicationDefined(base::BigEndianReader* reader, 76 const RtcpCommonHeader& header); 77 bool ParseCastReceiverLogFrameItem(base::BigEndianReader* reader); 78 bool ParseFeedbackCommon(base::BigEndianReader* reader, 79 const RtcpCommonHeader& header); 80 bool ParseExtendedReport(base::BigEndianReader* reader, 81 const RtcpCommonHeader& header); 82 bool ParseExtendedReportReceiverReferenceTimeReport( 83 base::BigEndianReader* reader, 84 uint32 remote_ssrc); 85 bool ParseExtendedReportDelaySinceLastReceiverReport( 86 base::BigEndianReader* reader); 87 88 uint32 local_ssrc_; 89 uint32 remote_ssrc_; 90 91 bool has_sender_report_; 92 RtcpSenderInfo sender_report_; 93 94 uint32 last_report_; 95 uint32 delay_since_last_report_; 96 bool has_last_report_; 97 98 // |receiver_log_| is a vector vector, no need for has_*. 99 RtcpReceiverLogMessage receiver_log_; 100 101 bool has_cast_message_; 102 RtcpCastMessage cast_message_; 103 104 bool has_receiver_reference_time_report_; 105 RtcpReceiverReferenceTimeReport receiver_reference_time_report_; 106 107 DISALLOW_COPY_AND_ASSIGN(RtcpParser); 108 }; 109 110 // Converts a log event type to an integer value. 111 // NOTE: We have only allocated 4 bits to represent the type of event over the 112 // wire. Therefore, this function can only return values from 0 to 15. 113 uint8 ConvertEventTypeToWireFormat(CastLoggingEvent event); 114 115 // The inverse of |ConvertEventTypeToWireFormat()|. 116 CastLoggingEvent TranslateToLogEventFromWireFormat(uint8 event); 117 118 } // namespace cast 119 } // namespace media 120 121 #endif // MEDIA_CAST_RTCP_RTCP_UTILITY_H_ 122