/usr/include/ccrtp/rtppkt.h is in libccrtp-dev 2.0.9-2.2.
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//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
//
// This exception applies only to the code released under the name GNU
// ccRTP. If you copy code from other releases into a copy of GNU
// ccRTP, as the General Public License permits, the exception does
// not apply to the code that you add in this way. To avoid misleading
// anyone as to the status of such modified files, you must delete
// this exception notice from them.
//
// If you write modifications of your own for GNU ccRTP, it is your choice
// whether to permit this exception to apply to your modifications.
// If you do not wish that, delete this exception notice.
//
#ifndef CCXX_RTP_RTPPKT_H_
#define CCXX_RTP_RTPPKT_H_
#include <ccrtp/base.h>
#include <ccrtp/formats.h>
#include <ccrtp/CryptoContext.h>
NAMESPACE_COMMONCPP
/**
* @file rtppkt.h
*
* @short RTP packets handling.
**/
/**
* @defgroup rtppacket RTP data packets manipulation.
* @{
**/
/**
* @class RTPPacket
* @short A base class for both IncomingRTPPkt and OutgoingRTPPkt.
*
* Provides common low level header structures and related
* methods. This class provides an interface that allows for partial
* and generic manipulation of RTP data packets. Values are returned
* in host order, except raw structures, which are returned as they
* are sent through the network.
*
* @author David Sugar <dyfet@ostel.com>
**/
class CryptoContext;
class __EXPORT RTPPacket
{
private:
struct RTPFixedHeader;
struct RTPHeaderExt;
public:
/**
* Constructor, construct a packet object given the memory
* zone its content (header and payload) is stored. Commonly
* used to build RTPPacket objects from incoming data.
*
* @param block whole packet
* @param len total length (header + payload + padding) of the
* packet
* @param duplicate whether to memcopy the packet. At present,
* this feature is not used.
* @note used in IncomingRTPPkt.
**/
RTPPacket(const unsigned char* const block, size_t len,
bool duplicate = false);
/**
* Construct a packet object without specifying its real
* content yet. Commonly used for outgoing packets. Header
* fields and payload must be filled in by another methods or
* by a derived constructor.
*
* @param hdrlen length of the header (including CSRC and extension).
* @param plen payload length.
* @param paddinglen pad packet to a multiple of paddinglen
* @note used in OutgoingRTPPkt.
*/
RTPPacket(size_t hdrlen, size_t plen, uint8 paddinglen, CryptoContext* pcc= NULL);
/**
* Get the length of the header, including contributing
* sources identifiers and header extension, if present.
*
* @return number of octets.
**/
inline uint32
getHeaderSize() const
{ return hdrSize; }
/**
* @return pointer to the payload section of the packet.
**/
inline const uint8* const
getPayload() const
{ return (uint8*)(buffer + getHeaderSize()); }
/**
* @return length of the payload section, in octets.
**/
inline uint32
getPayloadSize() const
{ return payloadSize; }
/**
* @return value of the PT header field.
**/
inline PayloadType
getPayloadType() const
{ return static_cast<PayloadType>(getHeader()->payload); }
/**
* @return value of the sequence number header field, in host order.
**/
inline uint16
getSeqNum() const
{ return cachedSeqNum; }
/**
* @return packet timestamp in host order.
**/
inline uint32
getTimestamp() const
{ return cachedTimestamp; }
/**
* @return RTP protocol version of packet.
**/
inline uint8
getProtocolVersion() const
{ return getHeader()->version; }
/**
* Ask whether the packet contains padding bytes at the end
* @return true if the header padding bit is 1.
**/
inline bool
isPadded() const
{ return getHeader()->padding; }
/**
* Get the number of octets padding the end of the payload
* section.
*
* @return Padding length in octets.
**/
inline uint8
getPaddingSize() const
{ return buffer[total - 1]; }
/**
* Ask whether the packet is marked (for isntance, is a new
* talk spurt in some audio profiles).
*
* @return true is the header marker bit is 1.
**/
inline bool
isMarked() const
{ return getHeader()->marker; }
/**
* Ask whether the packet contains header extensions.
*
* @return true if the header extension bit is 1.
**/
inline bool
isExtended() const
{ return getHeader()->extension; }
/**
* Get the number of contributing sources specified in the
* packet header.
**/
inline uint16
getCSRCsCount() const
{ return getHeader()->cc; }
/**
* Get the 32-bit identifiers of the contributing sources for
* the packet as an array, of length getCSRCsCount().
*
* @return An array of CSRC identifiers as they are in the
* packet (in network order).
**/
inline const uint32*
getCSRCs() const
{ return static_cast<const uint32*>(&(getHeader()->sources[1])); }
/**
* Get the first 16 bits (in network order) of the header of
* the RTP header extension. Its meaning is undefined at this
* level.
*
* @return 0 if the packet has no header extension, otherwise
* the first 16 bits of the header extension, in
* network order.
*
* @note 0 could be a valid value for the first 16 bits, in
* that case RTPPacket::isExtended() should be use.
**/
inline uint16
getHdrExtUndefined() const
{ return (isExtended()? getHeaderExt()->undefined : 0); }
/**
* Get the length (in octets) of the data contained in the
* header extension. Note that this length does not include
* the four octets at the beginning of the header extension.
*
* @return 0 if the packet has no header extension, otherwise
* the length.
*
* @note 0 is a valid value for this field, so
* RTPPacket::isExtended() should be used.
**/
inline uint32
getHdrExtSize() const
{ return (isExtended()?
(static_cast<uint32>(ntohs(getHeaderExt()->length)) << 2) :
0); }
/**
* Get the content of the header extension.
*
* @return NULL if the packet has no header extension, otherwise
* a pointer to the packet header extension content.
**/
inline const unsigned char*
getHdrExtContent() const
{ return (isExtended() ?
(reinterpret_cast<const unsigned char*>(getHeaderExt()) +
sizeof(RTPHeaderExt)) :
NULL); }
/**
* Get the raw packet as it will be sent through the network.
*
* @return memory zone where the raw packet structure is
* stored in.
**/
inline const unsigned char* const
getRawPacket() const
{ return buffer; }
/**
* Get the raw packet length, including header, extension,
* payload and padding.
*
* @return size of the raw packet structure.
**/
inline uint32
getRawPacketSize() const
{ return total; }
inline uint32
getRawPacketSizeSrtp() const
{ return total + srtpLength; }
inline size_t
getSizeOfFixedHeader() const
{ return sizeof(RTPFixedHeader); }
/**
* Re-compute payload length.
*
* This recomputation may be necessary in case of SRTP. We need to decrypt
* the packet before we can handle padding. See @c takeInDataPacket in
* @c incqueue.cpp
*
* @param padding
* If true then set padding flag in RTP header and re-compute
* payloadSize.
*/
void reComputePayLength(bool padding);
protected:
/**
* Destructor, free the buffer provided in the constructor.
**/
inline virtual ~RTPPacket()
{ endPacket(); }
/**
* Free memory allocated for the packet.
**/
void
endPacket();
/**
* Return low level structure for the header of the packet.
*
* @return RTPFixedHeader pointer to the header of the packet.
**/
inline RTPFixedHeader*
getHeader() const
{ return reinterpret_cast<RTPFixedHeader*>(buffer); }
inline void
setExtension(bool e)
{ getHeader()->extension = e; }
/**
* Get a pointer to RTPHeaderExt pointing after the RTP header
* (fixed part plus contributing sources). No check for
* for the X bit is done.
*
* @return header extension if present, garbage if not.
**/
inline const RTPHeaderExt*
getHeaderExt() const
{
uint32 fixsize = sizeof(RTPFixedHeader) + (getHeader()->cc << 2);
return (reinterpret_cast<RTPHeaderExt*>(buffer + fixsize));
}
/**
* Obtain the absolute timestamp carried in the packet header.
*
* @return 32-bit timestamp in host order.
**/
inline uint32
getRawTimestamp() const
{ return ntohl(getHeader()->timestamp); }
inline void
setbuffer(const void* src, size_t len, size_t pos)
{ memcpy(buffer + pos,src,len); }
/// Packet sequence number in host order.
uint16 cachedSeqNum;
/// Packet timestamp in host order (includes initial shift).
uint32 cachedTimestamp;
/**
* Offset into packet memory pointing to area for SRTP data.
*
* This offset points to the memory where the SRTP protect will
* store the authentication and MKI data.
*/
uint32 srtpDataOffset;
/**
* Lebgth of additional SRTP data.
*
* Covers the SRTP authentication and MKI data.
*/
int32 srtpLength;
/// total length, including header, payload and padding
uint32 total;
/// note: payload (not full packet) size.
uint32 payloadSize;
private:
/// packet in memory
unsigned char* buffer;
/// size of the header, including contributing sources and extensions
uint32 hdrSize;
/// whether the object was contructed with duplicated = true
bool duplicated;
#ifdef CCXX_PACKED
#pragma pack(1)
#endif
/**
* @struct RTPFixedHeader
* @short RTP fixed header as it is send through the network.
*
* A low-level representation for generic RTP packet header as
* defined in RFC 1889. A packet consists of the fixed RTP
* header, a possibly empty list of contributing sources and
* the payload. Header contents are kept in network (big
* endian) order.
**/
struct RTPFixedHeader
{
#if __BYTE_ORDER == __BIG_ENDIAN
/// For big endian boxes
unsigned char version:2; ///< Version, currently 2
unsigned char padding:1; ///< Padding bit
unsigned char extension:1; ///< Extension bit
unsigned char cc:4; ///< CSRC count
unsigned char marker:1; ///< Marker bit
unsigned char payload:7; ///< Payload type
#else
/// For little endian boxes
unsigned char cc:4; ///< CSRC count
unsigned char extension:1; ///< Extension bit
unsigned char padding:1; ///< Padding bit
unsigned char version:2; ///< Version, currently 2
unsigned char payload:7; ///< Payload type
unsigned char marker:1; ///< Marker bit
#endif
uint16 sequence; ///< sequence number
uint32 timestamp; ///< timestamp
uint32 sources[1]; ///< contributing sources
};
/**
* @struct RFC2833Payload
* @short a structure defining RFC2833 Telephony events.
*
* structure to define RFC2833 telephony events in RTP. You can
* use this by recasing the pointer returned by getPayload().
*/
public:
struct RFC2833Payload
{
#if __BYTE_ORDER == __BIG_ENDIAN
uint8 event : 8;
bool ebit : 1;
bool rbit : 1;
uint8 vol : 6;
uint16 duration : 16;
#else
uint8 event : 8;
uint8 vol : 6;
bool rbit : 1;
bool ebit : 1;
uint16 duration : 16;
#endif
};
private:
/**
* @struct RTPHeaderExt
*
* Fixed component of the variable-length header extension,
* appended to the fixed header, after the CSRC list, when X
* == 1.
**/
struct RTPHeaderExt
{
uint16 undefined; ///< to be defined
uint16 length; ///< number of 32-bit words in the extension
};
#ifdef CCXX_PACKED
#pragma pack()
#endif
/* definitions for access to most common 2833 fields... */
public:
/**
* Fetch a raw 2833 packet.
*
* @return low level 2833 data structure.
*/
inline struct RFC2833Payload *getRaw2833Payload(void)
{return (struct RFC2833Payload *)getPayload();}
/**
* Fetch 2833 duration field.
*
* @return 2833 duration in native host machine byte order.
*/
inline uint16 get2833Duration(void)
{return ntohs(getRaw2833Payload()->duration);}
/**
* Set 2833 duration field.
*
* @param timestamp to use, native host machine byte order.
*/
inline void set2833Duration(uint16 timestamp)
{getRaw2833Payload()->duration = htons(timestamp);}
};
/**
* @class OutgoingRTPPkt
* @short RTP packets being sent.
*
* This class is intented to construct packet objects just before they
* are inserted into the sending queue, so that they are processed in
* a understandable and format independent manner inside the stack.
*
* @author Federico Montesino Pouzols <fedemp@altern.org>
**/
class __EXPORT OutgoingRTPPkt : public RTPPacket
{
public:
/**
* Construct a new packet to be sent, containing several
* contributing source identifiers, header extensions and
* payload.
*
* A new copy in memory (holding all this components
* along with the fixed header) is created. If the pointer
* to the SRTP CryptoContext is not NULL and holds a CryptoContext
* for the SSRC take the SSRC data into account when computing
* the required memory buffer.
*
* @param csrcs array of countributing source 32-bit
* identifiers, in host order.
* @param numcsrc number of CSRC identifiers in the array.
* @param hdrext whole header extension.
* @param hdrextlen size of whole header extension, in octets.
* @param data payload.
* @param datalen payload length, in octets.
* @param paddinglen pad packet to a multiple of paddinglen.
* @param pcc Pointer to the SRTP CryptoContext, defaults to NULL
* if not specified.
*
* @note For efficiency purposes, since this constructor is
* valid for all packets but is too complex for the common
* case, two simpler others are provided.
**/
OutgoingRTPPkt(const uint32* const csrcs, uint16 numcsrc,
const unsigned char* const hdrext, uint32 hdrextlen,
const unsigned char* const data, size_t datalen,
uint8 paddinglen= 0, CryptoContext* pcc= NULL);
/**
* Construct a new packet to be sent, containing several
* contributing source identifiers and payload.
*
* A new copy in
* memory (holding all this components along with the fixed
* header) is created. If the pointer
* to the SRTP CryptoContext is not NULL and holds a CryptoContext
* for the SSRC take the SSRC data into account when computing
* the required memory buffer.
*
* @param csrcs array of countributing source 32-bit
* identifiers, in host order.
* @param numcsrc number of CSRC identifiers in the array.
* @param data payload.
* @param datalen payload length, in octets.
* @param paddinglen pad packet to a multiple of paddinglen.
* @param pcc Pointer to the SRTP CryptoContext, defaults to NULL
* if not specified.
**/
OutgoingRTPPkt(const uint32* const csrcs, uint16 numcsrc,
const unsigned char* const data, size_t datalen,
uint8 paddinglen= 0, CryptoContext* pcc= NULL);
/**
* Construct a new packet (fast variant, with no contributing
* sources and no header extension) to be sent.
*
* A new copy in
* memory (holding the whole packet) is created. If the pointer
* to the SRTP CryptoContext is not NULL and holds a CryptoContext
* for the SSRC take the SSRC data into account when computing
* the required memory buffer.
*
* @param data payload.
* @param datalen payload length, in octets.
* @param paddinglen pad packet to a multiple of paddinglen.
* @param pcc Pointer to the SRTP CryptoContext, defaults to NULL
* if not specified.
**/
OutgoingRTPPkt(const unsigned char* const data, size_t datalen,
uint8 paddinglen= 0, CryptoContext* pcc= NULL);
~OutgoingRTPPkt()
{ }
/**
* @param pt Packet payload type.
**/
inline void
setPayloadType(PayloadType pt)
{ getHeader()->payload = pt; }
/**
* Sets the sequence number in the header.
*
* @param seq Packet sequence number, in host order.
**/
inline void
setSeqNum(uint16 seq)
{
cachedSeqNum = seq;
getHeader()->sequence = htons(seq);
}
/**
* @param pts Packet timestamp, in host order.
**/
inline void
setTimestamp(uint32 pts)
{
cachedTimestamp = pts;
getHeader()->timestamp = htonl(pts);
}
/**
* Set synchronization source numeric identifier.
*
* @param ssrc 32-bit Synchronization SouRCe numeric
* identifier, in host order.
**/
inline void
setSSRC(uint32 ssrc) const
{ getHeader()->sources[0] = htonl(ssrc); }
/**
* Set synchronization source numeric identifier. Special
* version to save endianness conversion.
*
* @param ssrc 32-bit Synchronization SouRCe numeric
* identifier, in network order.
**/
inline void
setSSRCNetwork(uint32 ssrc) const
{ getHeader()->sources[0] = ssrc; }
/**
* Specify the value of the marker bit. By default, the marker
* bit of outgoing packets is false/0. This method allows one to
* explicity specify and change that value.
*
* @param mark value for the market bit.
*/
inline void
setMarker(bool mark)
{ getHeader()->marker = mark; }
/**
* Called packet is setup.
*
* This private method computes the SRTP data and stores it in the
* packet. Then encrypt the payload data (ex padding).
*/
void protect(uint32 ssrc, CryptoContext* pcc);
/**
* Outgoing packets are equal if their sequence numbers match.
**/
inline bool
operator==(const OutgoingRTPPkt &p) const
{ return ( this->getSeqNum() == p.getSeqNum() ); }
/**
* Outgoing packets are not equal if their sequence numbers differ.
**/
inline bool
operator!=(const OutgoingRTPPkt &p) const
{ return ( this->getSeqNum() != p.getSeqNum() ); }
private:
/**
* Copy constructor from objects of its same kind, declared
* private to avoid its use.
**/
OutgoingRTPPkt(const OutgoingRTPPkt &o);
/**
* Assignment operator from objects of its same kind, declared
* private to avoid its use.
**/
OutgoingRTPPkt&
operator=(const OutgoingRTPPkt &o);
/**
* Set the list of CSRC identifiers in an RTP packet,
* switching host to network order.
*/
void setCSRCArray(const uint32* const csrcs, uint16 numcsrc);
};
/**
* @class IncomingRTPPkt
*
* @short RTP packets received from other participants.
*
* This class is intented to construct a packet object just after
* every packet is received by the scheduled queue, so that they are
* processed in an understandable and format independent manner inside
* the stack.
*
* @author Federico Montesino Pouzols <fedemp@altern.org>
*/
class __EXPORT IncomingRTPPkt : public RTPPacket
{
public:
/**
* Build an RTP packet object from a data buffer. This
* constructor first performs a generic RTP data packet header
* check, whose result can be checked via isHeaderValid().
*
* @param block pointer to the buffer the whole packet is stored in.
* @param len length of the whole packet, expressed in octets.
*
* @note If check fails, the packet object is
* incomplete. checking isHeaderValid() is recommended before
* using a new RTPPacket object.
**/
IncomingRTPPkt(const unsigned char* block, size_t len);
~IncomingRTPPkt()
{ }
/**
* Get validity of this packet
* @return whether the header check performed at construction
* time ended successfully.
**/
inline bool
isHeaderValid()
{ return headerValid; }
/**
* Get synchronization source numeric identifier.
*
* @return 32-bits Synchronization SouRCe numeric identifier,
* in host order.
**/
inline uint32
getSSRC() const
{ return cachedSSRC; }
/**
* Unprotect a received packet.
*
* Perform SRTP processing on this packet.
*
* @param pcc Pointer to SRTP CryptoContext.
* @return
* one if no errors, -1 if authentication failed, -2 if
* replay check failed
*/
int32
unprotect(CryptoContext* pcc);
/**
* Two incoming packets are equal if they come from sources
* with the same SSRC and have the same sequence number.
**/
inline bool
operator==(const IncomingRTPPkt &p) const
{ return ( (this->getSeqNum() == p.getSeqNum()) &&
(this->getSSRC() == p.getSSRC()) ); }
/**
* Two incoming packets are not equal if they come from
* different sources or have different sequence numbers.
**/
inline bool
operator!=(const IncomingRTPPkt &p) const
{ return !( *this == p ); }
private:
/**
* Copy constructor from objects of its same kind, declared
* private to avoid its use.
**/
IncomingRTPPkt(const IncomingRTPPkt &ip);
/**
* Assignment operator from objects of its same kind, declared
* private to avoid its use.
*/
IncomingRTPPkt&
operator=(const IncomingRTPPkt &ip);
/// Header validity, checked at construction time.
bool headerValid;
/// SSRC 32-bit identifier in host order.
uint32 cachedSSRC;
// Masks for RTP header validation: types matching RTCP SR or
// RR must be rejected to avoid accepting misaddressed RTCP
// packets.
static const uint16 RTP_INVALID_PT_MASK;
static const uint16 RTP_INVALID_PT_VALUE;
};
/** @}*/ // rtppacket
END_NAMESPACE
#endif // ndef CCXX_RTP_RTPPKT_H_
/** EMACS **
* Local variables:
* mode: c++
* c-basic-offset: 8
* End:
*/
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