75 lines
2 KiB
C
75 lines
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: SequenceNumberMap.h
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Contains: Data structure for keeping track of duplicate sequence numbers.
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Useful for removing duplicate packets from an RTP stream.
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*/
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#ifndef _SEQUENCE_NUMBER_MAP_H_
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#define _SEQUENCE_NUMBER_MAP_H_
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#include "OSHeaders.h"
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#define SEQUENCENUMBERMAPTESTING 1
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class SequenceNumberMap
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{
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public:
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enum
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{
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kDefaultSlidingWindowSize = 256
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};
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SequenceNumberMap(UInt32 inSlidingWindowSize = kDefaultSlidingWindowSize);
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~SequenceNumberMap() { delete [] fSlidingWindow; }
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// Returns whether this sequence number was already added or not.
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Bool16 AddSequenceNumber(UInt16 inSeqNumber);
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#if SEQUENCENUMBERMAPTESTING
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static void Test();
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#endif
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private:
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Bool16* fSlidingWindow;
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const SInt32 fWindowSize;
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const SInt32 fNegativeWindowSize;
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UInt16 fHighestSeqIndex;
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UInt16 fHighestSeqNumber;
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};
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#endif
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