rtpdump is a format used by rtptools to record and replay rtp data from network capture.
This page hosts a formal specification of Rtpdump (rtptools) using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.
All parsing code for C++98/STL generated by Kaitai Struct depends on the C++/STL runtime library. You have to install it before you can parse data.
For C++, the easiest way is to clone the runtime library sources and build them along with your project.
Using Kaitai Struct in C++/STL usually consists of 3 steps.
std::istream). One can open local file for that, or use existing std::string or char* buffer.
#include <fstream>
std::ifstream is("path/to/local/file.rtp", std::ifstream::binary);
#include <sstream>
std::istringstream is(str);
#include <sstream>
const char buf[] = { ... };
std::string str(buf, sizeof buf);
std::istringstream is(str);
#include "kaitai/kaitaistream.h"
kaitai::kstream ks(&is);
rtpdump_t data(&ks);
After that, one can get various attributes from the structure by invoking getter methods like:
data.file_header() // => get file header
#ifndef RTPDUMP_H_
#define RTPDUMP_H_
// This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
#include "kaitai/kaitaistruct.h"
#include <stdint.h>
#include "rtp_packet.h"
#include <vector>
#if KAITAI_STRUCT_VERSION < 9000L
#error "Incompatible Kaitai Struct C++/STL API: version 0.9 or later is required"
#endif
class rtp_packet_t;
/**
* rtpdump is a format used by rtptools to record and replay
* rtp data from network capture.
* \sa https://chromium.googlesource.com/external/webrtc/stable/talk/+/master/media/base/rtpdump.h Source
*/
class rtpdump_t : public kaitai::kstruct {
public:
class header_t_t;
class packet_t_t;
rtpdump_t(kaitai::kstream* p__io, kaitai::kstruct* p__parent = 0, rtpdump_t* p__root = 0);
private:
void _read();
void _clean_up();
public:
~rtpdump_t();
class header_t_t : public kaitai::kstruct {
public:
header_t_t(kaitai::kstream* p__io, rtpdump_t* p__parent = 0, rtpdump_t* p__root = 0);
private:
void _read();
void _clean_up();
public:
~header_t_t();
private:
std::string m_shebang;
std::string m_space;
std::string m_ip;
std::string m_port;
uint32_t m_start_sec;
uint32_t m_start_usec;
uint32_t m_ip2;
uint16_t m_port2;
uint16_t m_padding;
rtpdump_t* m__root;
rtpdump_t* m__parent;
public:
std::string shebang() const { return m_shebang; }
std::string space() const { return m_space; }
std::string ip() const { return m_ip; }
std::string port() const { return m_port; }
/**
* start of recording, the seconds part.
*/
uint32_t start_sec() const { return m_start_sec; }
/**
* start of recording, the microseconds part.
*/
uint32_t start_usec() const { return m_start_usec; }
/**
* network source.
*/
uint32_t ip2() const { return m_ip2; }
/**
* port.
*/
uint16_t port2() const { return m_port2; }
/**
* 2 bytes padding.
*/
uint16_t padding() const { return m_padding; }
rtpdump_t* _root() const { return m__root; }
rtpdump_t* _parent() const { return m__parent; }
};
class packet_t_t : public kaitai::kstruct {
public:
packet_t_t(kaitai::kstream* p__io, rtpdump_t* p__parent = 0, rtpdump_t* p__root = 0);
private:
void _read();
void _clean_up();
public:
~packet_t_t();
private:
uint16_t m_length;
uint16_t m_len_body;
uint32_t m_packet_usec;
rtp_packet_t* m_body;
rtpdump_t* m__root;
rtpdump_t* m__parent;
std::string m__raw_body;
kaitai::kstream* m__io__raw_body;
public:
/**
* packet length (including this header).
*/
uint16_t length() const { return m_length; }
/**
* payload length.
*/
uint16_t len_body() const { return m_len_body; }
/**
* timestamp of packet since the start.
*/
uint32_t packet_usec() const { return m_packet_usec; }
rtp_packet_t* body() const { return m_body; }
rtpdump_t* _root() const { return m__root; }
rtpdump_t* _parent() const { return m__parent; }
std::string _raw_body() const { return m__raw_body; }
kaitai::kstream* _io__raw_body() const { return m__io__raw_body; }
};
private:
header_t_t* m_file_header;
std::vector<packet_t_t*>* m_packets;
rtpdump_t* m__root;
kaitai::kstruct* m__parent;
public:
header_t_t* file_header() const { return m_file_header; }
std::vector<packet_t_t*>* packets() const { return m_packets; }
rtpdump_t* _root() const { return m__root; }
kaitai::kstruct* _parent() const { return m__parent; }
};
#endif // RTPDUMP_H_
// This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
#include "rtpdump.h"
#include "kaitai/exceptions.h"
rtpdump_t::rtpdump_t(kaitai::kstream* p__io, kaitai::kstruct* p__parent, rtpdump_t* p__root) : kaitai::kstruct(p__io) {
m__parent = p__parent;
m__root = this;
m_file_header = 0;
m_packets = 0;
try {
_read();
} catch(...) {
_clean_up();
throw;
}
}
void rtpdump_t::_read() {
m_file_header = new header_t_t(m__io, this, m__root);
m_packets = new std::vector<packet_t_t*>();
{
int i = 0;
while (!m__io->is_eof()) {
m_packets->push_back(new packet_t_t(m__io, this, m__root));
i++;
}
}
}
rtpdump_t::~rtpdump_t() {
_clean_up();
}
void rtpdump_t::_clean_up() {
if (m_file_header) {
delete m_file_header; m_file_header = 0;
}
if (m_packets) {
for (std::vector<packet_t_t*>::iterator it = m_packets->begin(); it != m_packets->end(); ++it) {
delete *it;
}
delete m_packets; m_packets = 0;
}
}
rtpdump_t::header_t_t::header_t_t(kaitai::kstream* p__io, rtpdump_t* p__parent, rtpdump_t* p__root) : kaitai::kstruct(p__io) {
m__parent = p__parent;
m__root = p__root;
try {
_read();
} catch(...) {
_clean_up();
throw;
}
}
void rtpdump_t::header_t_t::_read() {
m_shebang = m__io->read_bytes(12);
if (!(shebang() == std::string("\x23\x21\x72\x74\x70\x70\x6C\x61\x79\x31\x2E\x30", 12))) {
throw kaitai::validation_not_equal_error<std::string>(std::string("\x23\x21\x72\x74\x70\x70\x6C\x61\x79\x31\x2E\x30", 12), shebang(), _io(), std::string("/types/header_t/seq/0"));
}
m_space = m__io->read_bytes(1);
if (!(space() == std::string("\x20", 1))) {
throw kaitai::validation_not_equal_error<std::string>(std::string("\x20", 1), space(), _io(), std::string("/types/header_t/seq/1"));
}
m_ip = kaitai::kstream::bytes_to_str(m__io->read_bytes_term(47, false, true, true), std::string("ascii"));
m_port = kaitai::kstream::bytes_to_str(m__io->read_bytes_term(10, false, true, true), std::string("ascii"));
m_start_sec = m__io->read_u4be();
m_start_usec = m__io->read_u4be();
m_ip2 = m__io->read_u4be();
m_port2 = m__io->read_u2be();
m_padding = m__io->read_u2be();
}
rtpdump_t::header_t_t::~header_t_t() {
_clean_up();
}
void rtpdump_t::header_t_t::_clean_up() {
}
rtpdump_t::packet_t_t::packet_t_t(kaitai::kstream* p__io, rtpdump_t* p__parent, rtpdump_t* p__root) : kaitai::kstruct(p__io) {
m__parent = p__parent;
m__root = p__root;
m_body = 0;
m__io__raw_body = 0;
try {
_read();
} catch(...) {
_clean_up();
throw;
}
}
void rtpdump_t::packet_t_t::_read() {
m_length = m__io->read_u2be();
m_len_body = m__io->read_u2be();
m_packet_usec = m__io->read_u4be();
m__raw_body = m__io->read_bytes(len_body());
m__io__raw_body = new kaitai::kstream(m__raw_body);
m_body = new rtp_packet_t(m__io__raw_body);
}
rtpdump_t::packet_t_t::~packet_t_t() {
_clean_up();
}
void rtpdump_t::packet_t_t::_clean_up() {
if (m__io__raw_body) {
delete m__io__raw_body; m__io__raw_body = 0;
}
if (m_body) {
delete m_body; m_body = 0;
}
}