//    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 "stdafx.h"

#include "DubSource.h"

BOOL DubSource::init() {
    return TRUE;
}

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<lSampleFirst || 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() {
}

