114 lines
4.2 KiB
C
114 lines
4.2 KiB
C
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/*
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*
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* @APPLE_LICENSE_HEADER_START@
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*
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* Copyright (c) 1999-2008 Apple Inc. All Rights Reserved.
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this
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* file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_LICENSE_HEADER_END@
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*
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*/
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/*
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File: RTPPacket.h
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Some useful things for parsing RTPPackets.
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*/
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#ifndef _RTPPACKET_H_
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#define _RTPPACKET_H_
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#include "arpa/inet.h"
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#include "OSHeaders.h"
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#include "StrPtrLen.h"
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class RTPPacket
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{
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public:
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enum {
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RTP_VERSION = 2,
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RTCP_SR = 200,
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RTCP_RR = 201,
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RTCP_SDES = 202,
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RTCP_BYE = 203,
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RTCP_APP = 204
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};
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/*
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* RTP data header
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*/
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struct RTPHeader {
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#if 0
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//rtp header
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unsigned int version:2; /* protocol version */
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unsigned int p:1; /* padding flag */
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unsigned int x:1; /* header extension flag */
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unsigned int cc:4; /* CSRC count */
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unsigned int m:1; /* marker bit */
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unsigned int pt:7; /* payload type */
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#endif
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UInt16 rtpheader;
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UInt16 seq; /* sequence number */
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UInt32 ts; /* timestamp */
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UInt32 ssrc; /* synchronization source */
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//UInt32 csrc[1]; /* optional CSRC list */
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};
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RTPPacket(StrPtrLen inPacket)
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: fPacket(reinterpret_cast<RTPHeader *>(inPacket.Ptr)), fLen(inPacket.Len)
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{}
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RTPPacket(char *inPacket = NULL, UInt32 inLen = NULL)
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: fPacket(reinterpret_cast<RTPHeader *>(inPacket)), fLen(inLen)
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{}
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UInt8 GetPayloadType() const { return ntohs(fPacket->rtpheader) & 0x007F; }
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UInt8 GetCSRCCount() const { return (ntohs(fPacket->rtpheader) & 0x0F00 ) >> 8; }
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//The following get functions will convert from network byte order to host byte order.
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//Conversely the set functions will convert from host byte order to network byte order.
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UInt16 GetSeqNum() const { return ntohs(fPacket->seq); }
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void SetSeqNum(UInt16 seqNum) { fPacket->seq = htons(seqNum); }
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UInt32 GetTimeStamp() const { return ntohl(fPacket->ts); }
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void SetTimeStamp(UInt32 timeStamp) { fPacket->ts = htonl(timeStamp); }
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UInt32 GetSSRC() const { return ntohl(fPacket->ssrc); }
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void SetSSRC(UInt32 SSRC) { fPacket->ssrc = htonl(SSRC); }
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//Includes the variable CSRC portion
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UInt32 GetHeaderLen() const { return sizeof(RTPHeader) + GetCSRCCount() * 4; }
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StrPtrLen GetBody() const { return StrPtrLen(reinterpret_cast<char *>(fPacket) + GetHeaderLen(), fLen - GetHeaderLen()); }
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//Returns true if the header is not bad; do some very basic checking
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Bool16 HeaderIsValid() const
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{
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Assert(sizeof(RTPHeader) == 12);
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if (fLen < sizeof(RTPHeader))
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return false;
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if ( ( ntohs(fPacket->rtpheader) >> 14) != RTP_VERSION )
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return false;
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if (GetHeaderLen() > fLen)
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return false;
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return true;
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}
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RTPHeader * fPacket;
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UInt32 fLen; //total length of the packet, including the header
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};
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#endif
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