152 lines
4.9 KiB
C
152 lines
4.9 KiB
C
|
/*
|
||
|
|
*
|
||
|
|
* @APPLE_LICENSE_HEADER_START@
|
||
|
|
*
|
||
|
|
* Copyright (c) 1999-2008 Apple Inc. All Rights Reserved.
|
||
|
|
*
|
||
|
|
* This file contains Original Code and/or Modifications of Original Code
|
||
|
|
* as defined in and that are subject to the Apple Public Source License
|
||
|
|
* Version 2.0 (the 'License'). You may not use this file except in
|
||
|
|
* compliance with the License. Please obtain a copy of the License at
|
||
|
|
* http://www.opensource.apple.com/apsl/ and read it before using this
|
||
|
|
* file.
|
||
|
|
*
|
||
|
|
* The Original Code and all software distributed under the License are
|
||
|
|
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
|
||
|
|
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
|
||
|
|
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
|
||
|
|
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
|
||
|
|
* Please see the License for the specific language governing rights and
|
||
|
|
* limitations under the License.
|
||
|
|
*
|
||
|
|
* @APPLE_LICENSE_HEADER_END@
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
/*
|
||
|
|
File: RTCPAckPacket.h
|
||
|
|
|
||
|
|
Contains: RTCPAckPacket de-packetizing class
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef _RTCPACKPACKET_H_
|
||
|
|
#define _RTCPACKPACKET_H_
|
||
|
|
|
||
|
|
#include "OSHeaders.h"
|
||
|
|
#include "RTCPAPPPacket.h"
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include "SafeStdLib.h"
|
||
|
|
#ifndef __Win32__
|
||
|
|
#include <netinet/in.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
class RTCPAckPacket : public RTCPAPPPacket
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
|
||
|
|
/*
|
||
|
|
|
||
|
|
RTCP app ACK packet
|
||
|
|
|
||
|
|
# bytes description
|
||
|
|
------- -----------
|
||
|
|
4 rtcp header
|
||
|
|
4 SSRC of receiver
|
||
|
|
4 app type ('qtak')
|
||
|
|
2 reserved (set to 0)
|
||
|
|
2 seqNum
|
||
|
|
|
||
|
|
*/
|
||
|
|
|
||
|
|
//
|
||
|
|
// This class is not derived from RTCPPacket as a performance optimization.
|
||
|
|
// Instead, it is assumed that the RTCP packet validation has already been
|
||
|
|
// done.
|
||
|
|
RTCPAckPacket() : fRTCPAckBuffer(NULL), fAckMaskSize(0) {}
|
||
|
|
virtual ~RTCPAckPacket() {}
|
||
|
|
|
||
|
|
// Call to parse if you don't know what kind of packet this is
|
||
|
|
// Returns true if this is an Ack packet, false otherwise.
|
||
|
|
// Assumes that inPacketBuffer is a pointer to a valid RTCP packet header.
|
||
|
|
Bool16 ParseAckPacket(UInt8* inPacketBuffer, UInt32 inPacketLength);
|
||
|
|
|
||
|
|
virtual Bool16 ParseAPPData(UInt8* inPacketBuffer, UInt32 inPacketLength);
|
||
|
|
|
||
|
|
inline UInt16 GetAckSeqNum();
|
||
|
|
inline UInt32 GetAckMaskSizeInBits() { return fAckMaskSize * 8; }
|
||
|
|
inline Bool16 IsNthBitEnabled(UInt32 inBitNumber);
|
||
|
|
inline UInt16 GetPacketLength();
|
||
|
|
void Dump();
|
||
|
|
static void GetTestPacket(StrPtrLen* resultPtr) {} //todo
|
||
|
|
|
||
|
|
enum
|
||
|
|
{
|
||
|
|
kAckPacketName = FOUR_CHARS_TO_INT('q', 't', 'a', 'k'), // 'qtak' documented Apple reliable UDP packet type
|
||
|
|
kAckPacketAlternateName = FOUR_CHARS_TO_INT('a', 'c', 'k', ' '), // 'ack ' required by QT 5 and earlier
|
||
|
|
};
|
||
|
|
private:
|
||
|
|
|
||
|
|
UInt8* fRTCPAckBuffer;
|
||
|
|
UInt32 fAckMaskSize;
|
||
|
|
|
||
|
|
Bool16 IsAckPacketType();
|
||
|
|
|
||
|
|
enum
|
||
|
|
{
|
||
|
|
kAppPacketTypeOffset = 8,
|
||
|
|
kAckSeqNumOffset = 16,
|
||
|
|
kAckMaskOffset = 20,
|
||
|
|
kPacketLengthMask = 0x0000FFFFUL,
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
inline Bool16 IsAckType(UInt32 theAppType) { return ( (theAppType == kAckPacketAlternateName) || (theAppType == kAckPacketName) );}
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
Bool16 RTCPAckPacket::IsNthBitEnabled(UInt32 inBitNumber)
|
||
|
|
{
|
||
|
|
// Don't need to do endian conversion because we're dealing with 8-bit numbers
|
||
|
|
UInt8 bitMask = 128;
|
||
|
|
return *(fRTCPAckBuffer + kAckMaskOffset + (inBitNumber >> 3)) & (bitMask >>= inBitNumber & 7);
|
||
|
|
}
|
||
|
|
|
||
|
|
UInt16 RTCPAckPacket::GetAckSeqNum()
|
||
|
|
{
|
||
|
|
return (UInt16) (ntohl(*(UInt32*)&fRTCPAckBuffer[kAckSeqNumOffset]));
|
||
|
|
}
|
||
|
|
|
||
|
|
inline UInt16 RTCPAckPacket::GetPacketLength()
|
||
|
|
{
|
||
|
|
return (UInt16) ( ntohl(*(UInt32*)fRTCPAckBuffer) & kPacketLengthMask);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
6.6 Ack Packet format
|
||
|
|
|
||
|
|
0 1 2 3
|
||
|
|
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|
||
|
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
|
|
|V=2|P| subtype | PT=APP=204 | length |
|
||
|
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
|
|
| SSRC/CSRC |
|
||
|
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
|
|
| name (ASCII) = 'qtak' |
|
||
|
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
|
|
| SSRC/CSRC |
|
||
|
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
|
|
| Reserved | Seq num |
|
||
|
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
|
|
| Mask... |
|
||
|
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
|
|
|
||
|
|
*/
|
||
|
|
|
||
|
|
#endif //_RTCPAPPPACKET_H_
|