www.pudn.com > XvidQP.rar > DubSource.cpp

//	VirtualDub - Video processing and capture application 
//	Copyright (C) 1998-2001 Avery Lee 
// 
//	This program is free software; you can redistribute it and/or modify 
//	it under the terms of the GNU General Public License as published by 
//	the Free Software Foundation; either version 2 of the License, or 
//	(at your option) any later version. 
// 
//	This program is distributed in the hope that it will be useful, 
//	but WITHOUT ANY WARRANTY; without even the implied warranty of 
//	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
//	GNU General Public License for more details. 
// 
//	You should have received a copy of the GNU General Public License 
//	along with this program; if not, write to the Free Software 
//	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 
 
#include "DubSource.h" 
 
DubSource::DubSource() { 
	format = NULL; 
} 
 
DubSource::~DubSource() { 
	if (format) delete format; 
} 
 
BOOL DubSource::init() { 
	return TRUE; 
} 
 
void *DubSource::allocFormat(int format_len) { 
	if (format) delete format; 
 
	return format = (void *)new char[this->format_len = format_len]; 
} 
 
bool DubSource::isStreaming() { 
	return false; 
} 
 
int DubSource::read(LONG lStart, LONG lCount, LPVOID lpBuffer, LONG cbBuffer, LONG *lBytesRead, LONG *lSamplesRead) { 
	if (lStart < lSampleFirst) return AVIERR_BADPARAM; 
	if (lStart >= lSampleLast) { 
		if (lSamplesRead) 
			*lSamplesRead = 0; 
		if (lBytesRead) 
			*lBytesRead = 0; 
		return 0; 
	} 
 
	if (lCount>0 && lCount > lSampleLast - lStart) lCount = lSampleLast - lStart; 
 
	return _read(lStart, lCount, lpBuffer, cbBuffer, lBytesRead, lSamplesRead); 
} 
 
BOOL DubSource::isKey(LONG lSample) { 
	if (lSample=lSampleLast) return TRUE; 
 
	return _isKey(lSample); 
} 
 
BOOL DubSource::_isKey(LONG lSample) { 
	return TRUE; 
} 
 
LONG DubSource::nearestKey(LONG lSample) { 
	return lSample; 
} 
 
LONG DubSource::prevKey(LONG lSample) { 
	return lSample <= lSampleFirst ? -1 : lSample-1; 
} 
 
LONG DubSource::nextKey(LONG lSample) { 
	return lSample+1 >= lSampleFirst ? -1 : lSample+1; 
} 
 
void DubSource::streamBegin(bool fRealTime) { 
} 
 
void DubSource::streamEnd() { 
}