[feat] rewrite rtp module

src/rtp/rtp_packet/rtp_header.h

@@ -7,40 +7,58 @@
 #ifndef _RTP_HEADER_H_
 #define _RTP_HEADER_H_
 
+#include <chrono>
 #include <cstddef>
 #include <cstdint>
 #include <optional>
 #include <string>
 
-#include "api/units/timestamp.h"
+static constexpr int kMaxRtpCsrcSize = 15;
+static constexpr uint8_t kRtpVersion = 2;
 
-static constexpr int kAbsSendTimeFraction = 18;
+struct RTPHeaderExtension {
+  RTPHeaderExtension();
+  RTPHeaderExtension(const RTPHeaderExtension& other);
+  RTPHeaderExtension& operator=(const RTPHeaderExtension& other);
 
-enum { kRtpCsrcSize = 15 };  // RFC 3550 page 13
+  static constexpr int kAbsSendTimeFraction = 18;
+
+  bool hasAbsoluteSendTime;
+  uint32_t absoluteSendTime;
+};
 
 struct RTPHeader {
   RTPHeader()
-      : markerBit(false),
-        payloadType(0),
-        sequenceNumber(0),
-        timestamp(0),
-        ssrc(0),
-        numCSRCs(0),
-        arrOfCSRCs(),
-        paddingLength(0),
-        headerLength(0){};
+      : version_(kRtpVersion),
+        has_padding_(false),
+        has_extension_(false),
+        csrc_count_(0),
+        marker_(false),
+        payload_type_(0),
+        sequence_number_(1),
+        timestamp_(0),
+        ssrc_(0),
+        csrcs_(),
+        padding_len(0),
+        header_len(0){};
+
   RTPHeader(const RTPHeader& other) = default;
   RTPHeader& operator=(const RTPHeader& other) = default;
 
-  bool markerBit;
-  uint8_t payloadType;
-  uint16_t sequenceNumber;
-  uint32_t timestamp;
-  uint32_t ssrc;
-  uint8_t numCSRCs;
-  uint32_t arrOfCSRCs[kRtpCsrcSize];
-  size_t paddingLength;
-  size_t headerLength;
+  uint8_t version_ = 0;
+  bool has_padding_ = false;
+  bool has_extension_ = false;
+  uint8_t csrc_count_ = 0;
+  bool marker_ = false;
+  uint8_t payload_type_ = 0;
+  uint16_t sequence_number_ = 1;
+  uint64_t timestamp_ = 0;
+  uint32_t ssrc_ = 0;
+  uint32_t csrcs_[kRtpCsrcSize];
+  size_t padding_len;
+  size_t header_len;
+
+  RTPHeaderExtension extension;
 };
 
 #endif