/*! *************************************************************************** * * \file rtp.h * * \brief *    Definition of structures and functions to handle RTP headers.  For a *    description of RTP see RFC1889 on http://www.ietf.org * * \date *    30 September 2001 * * \author *    Stephan Wenger   stewe@cs.tu-berlin.de **************************************************************************/#ifndef _RTP_H_#define _RTP_H_#include <stdio.h>#include "global.h"#include "nalu.h"#define MAXRTPPAYLOADLEN  (65536 - 40)    //!< Maximum payload size of an RTP packet#define MAXRTPPACKETSIZE  (65536 - 28)    //!< Maximum size of an RTP packet incl. header#define H26LPAYLOADTYPE 105               //!< RTP paylaod type fixed here for simplicity#define H26LSSRC 0x12345678               //!< SSRC, chosen to simplify debugging#define RTP_TR_TIMESTAMP_MULT 1000        //!< should be something like 27 Mhz / 29.97 Hztypedef struct {  unsigned int v;          //!< Version, 2 bits, MUST be 0x2  unsigned int p;          //!< Padding bit, Padding MUST NOT be used  unsigned int x;          //!< Extension, MUST be zero */  unsigned int cc;         /*!< CSRC count, normally 0 in the absence                                 of RTP mixers */  unsigned int m;          //!< Marker bit  unsigned int pt;         //!< 7 bits, Payload Type, dynamically established  unsigned int seq;        /*!< RTP sequence number, incremented by one for                                 each sent packet */  unsigned int timestamp;  //!< timestamp, 27 MHz for H.26L  unsigned int ssrc;       //!< Synchronization Source, chosen randomly  byte *       payload;    //!< the payload including payload headers  unsigned int paylen;     //!< length of payload in bytes  byte *       packet;     //!< complete packet including header and payload  unsigned int packlen;    //!< length of packet, typically paylen+12} RTPpacket_t;#if 0int  ComposeRTPPacket (RTPpacket_t *p);int  DecomposeRTPpacket (RTPpacket_t *p);int  WriteRTPPacket (RTPpacket_t *p, FILE *f);void DumpRTPHeader (RTPpacket_t *p);void RTPUpdateTimestamp (int tr);int  RTPWriteBits (int Marker, int PacketType, void * bitstream,                    int BitStreamLenInByte, FILE *out);Boolean isAggregationPacket();int aggregationRTPWriteBits (int Marker, int PacketType, int subPacketType, void * bitstream, int BitStreamLenInByte, FILE *out);void begin_sub_sequence_rtp();void end_sub_sequence_rtp();#endifvoid RTPUpdateTimestamp (int tr);void OpenRTPFile (char *Filename);void CloseRTPFile ();int WriteRTPNALU (NALU_t *n);#endif