tconverter_fxp.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 ***** */
- /*****************************************************************************
- * Includes
- */
- #include "tconverter_fxp.h"
- /*****************************************************************************
- * CHXTimestampConverterFXP Class
- */
- /*****************************************************************************
- * ReInit
- * if CvtType == FACTORS, ulVal1 is HXA Factor, ulVal2 is RTP Factor
- * if CvtType == SAMPLES, ulVal1 is Sample Rate
- */
- void CHXTimestampConverterFXP::ReInit(ConversionType cvtType,
- UINT32 ulVal1,
- UINT32 ulVal2)
- {
- if (cvtType == FACTORS)
- {
- m_hxaTime.ulBase = ulVal1; // HXFactor
- m_rtpTime.ulBase = ulVal2; // RTPFactor
- }
- else
- {
- m_hxaTime.ulBase = 1000; // HXFactor = 1000 samples/sec
- m_rtpTime.ulBase = ulVal1; // RTPFactor
- }
-
- m_hxaTime.lQ = 0;
- m_hxaTime.lR = 0;
- m_hxaTime.ulRef = 0;
- m_hxaTime.ulAnchor = 0;
- m_hxaTime.ulHalfBase = m_hxaTime.ulBase / 2;
-
- m_rtpTime.lQ = 0;
- m_rtpTime.lR = 0;
- m_rtpTime.ulRef = 0;
- m_rtpTime.ulAnchor = 0;
- m_rtpTime.ulHalfBase = m_rtpTime.ulBase / 2;
- }
- /*****************************************************************************
- * timeConvert
- */
- ULONG32 CHXTimestampConverterFXP::timeConvert(ULONG32 ulT1,
- TimeCoordinate& T1,
- TimeCoordinate& T2)
- {
- LONG32 lSamples;
- LONG32 ldQ;
- LONG32 ldR;
- // Compute the change in samples (+ or -)
- lSamples = ulT1 - T1.ulRef;
- T1.ulRef = ulT1;
- // Compute the Quant in Common Base (+ or -)
- // and remainder in samples (always +)
- T1.lR += lSamples; // Could become - at this moment
-
- ldQ = ((LONG32) (T1.lR - T1.ulBase)) / ((LONG32) T1.ulBase);
- ldR = ldQ * ((LONG32) T1.ulBase);
- T1.lR -= ldR; // Always yields +
- T1.lQ += ldQ; // + or -
- // Convert the number of samples accumulate from anchor point to
- // other timebase
- return ((ULONG32) (T2.ulAnchor +
- (T1.lQ * T2.ulBase) +
- (T1.lR * T2.ulBase + T1.ulHalfBase) / T1.ulBase));
- }
- /*****************************************************************************
- * setAnchor
- */
- void CHXTimestampConverterFXP::setHXAnchor(UINT32 ulHXAnchor)
- {
- m_hxaTime.ulRef = m_hxaTime.ulAnchor = ulHXAnchor;
- m_rtpTime.ulRef = m_rtpTime.ulAnchor = timeConvertRaw(ulHXAnchor, m_hxaTime, m_rtpTime);
- m_rtpTime.lQ = m_rtpTime.lR = 0;
- m_hxaTime.lQ = m_hxaTime.lR = 0;
- }
- void CHXTimestampConverterFXP::setRTPAnchor(UINT32 ulRTPAnchor)
- {
- m_rtpTime.ulRef = m_rtpTime.ulAnchor = ulRTPAnchor;
- m_hxaTime.ulRef = m_hxaTime.ulAnchor = timeConvertRaw(ulRTPAnchor, m_rtpTime, m_hxaTime);
- m_rtpTime.lQ = m_rtpTime.lR = 0;
- m_hxaTime.lQ = m_hxaTime.lR = 0;
- }
- void CHXTimestampConverterFXP::setAnchor(UINT32 ulHXAnchor, UINT32 ulRTPAnchor)
- {
- m_hxaTime.ulRef = m_hxaTime.ulAnchor = ulHXAnchor;
- m_rtpTime.ulRef = m_rtpTime.ulAnchor = ulRTPAnchor;
- m_rtpTime.lQ = m_rtpTime.lR = 0;
- m_hxaTime.lQ = m_hxaTime.lR = 0;
- }
- /*****************************************************************************
- * assignment
- */
- CHXTimestampConverterFXP& CHXTimestampConverterFXP::operator=(const CHXTimestampConverterFXP& lhs)
- {
- m_hxaTime = lhs.m_hxaTime;
- m_rtpTime = lhs.m_rtpTime;
-
- return *this;
- }