rfc2429hlpr.cpp
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上传日期:2007-06-06
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- /* ***** BEGIN LICENSE BLOCK *****
- * Version: RCSL 1.0/RPSL 1.0
- *
- * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved.
- *
- * The contents of this file, and the files included with this file, are
- * subject to the current version of the RealNetworks Public Source License
- * Version 1.0 (the "RPSL") available at
- * http://www.helixcommunity.org/content/rpsl unless you have licensed
- * the file under the RealNetworks Community Source License Version 1.0
- * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl,
- * in which case the RCSL will apply. You may also obtain the license terms
- * directly from RealNetworks. You may not use this file except in
- * compliance with the RPSL or, if you have a valid RCSL with RealNetworks
- * applicable to this file, the RCSL. Please see the applicable RPSL or
- * RCSL for the rights, obligations and limitations governing use of the
- * contents of the file.
- *
- * This file is part of the Helix DNA Technology. RealNetworks is the
- * developer of the Original Code and owns the copyrights in the portions
- * it created.
- *
- * This file, and the files included with this file, is distributed and made
- * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- *
- * Technology Compatibility Kit Test Suite(s) Location:
- * http://www.helixcommunity.org/content/tck
- *
- * Contributor(s):
- *
- * ***** END LICENSE BLOCK ***** */
- #include "./rfc2429hlpr.h"
- #include "bitpack.h"
- CRFC2429Helper::CRFC2429Helper() :
- m_bPictureStart(FALSE),
- m_ulPayloadSize(0),
- m_bP(FALSE),
- m_pPayload(0)
- {}
- CRFC2429Helper::~CRFC2429Helper()
- {}
- HX_RESULT CRFC2429Helper::OnPacket(const UINT8* pBuf, ULONG32 ulBufSize)
- {
- HX_RESULT res = HXR_UNEXPECTED;
-
- const UINT8* pData = pBuf;
- m_bPictureStart = FALSE;
- m_ulPayloadSize = 0;
- m_bP = FALSE;
- m_pPayload = 0;
- // RFC 2429 Section 4.1
- // 0 1
- // 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- // | RR |P|V| PLEN |PEBIT|
- // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- if ((ulBufSize >= 3) && // Make sure the buffer is large enough
- ((pData[0] & 0xf8) == 0x00)) // Make sure RR field is 0
- {
- m_bP = ((pData[0] & 0x04) == 0x04);
- BOOL bV = ((pData[0] & 0x02) == 0x02);
- UINT8 uPLEN = ((pData[0] & 0x1) << 6) | ((pData[1] >> 3) & 0x1f);
- UINT8 uPEBIT = (pData[1] & 0x7);
-
- pData += 2;
- // Make sure the packet is large enough
- if (ulBufSize >= (ULONG32)(2 + ((bV) ? 1 : 0) + uPLEN + 1))
- {
- if (bV)
- {
- // Skip the VRC(Section 4.2) since we don't really
- // care about it's contents
- pData++;
- }
- if (uPLEN > 0)
- {
- // Skip the extra picture header (Section 5.1.1) since
- // we don't really care about it's contents
- pData += uPLEN;
- }
-
- m_pPayload = pData;
- m_ulPayloadSize = (ulBufSize - (m_pPayload - pBuf)) * 8;
-
- if (m_bP && (m_pPayload[0] & 0xfc) == 0x80)
- m_bPictureStart = TRUE;
- res = HXR_OK;
- }
- }
- return res;
- }
- BOOL CRFC2429Helper::IsPictureStart() const
- {
- return m_bPictureStart;
- }
- ULONG32 CRFC2429Helper::DataSize() const // in bits
- {
- ULONG32 ret = m_ulPayloadSize;
- if (m_bP)
- ret += 16;
- return ret;
- }
- HX_RESULT CRFC2429Helper::CopyPayload(BitPacker& bp)
- {
- if (m_bP)
- bp.PackBits(0,16);
-
- bp.PackBits(m_pPayload, m_ulPayloadSize, 0);
- return HXR_OK;
- }