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76 lines
2.1 KiB
C++
76 lines
2.1 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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#include "sound/timestamp.h"
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namespace Audio {
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Timestamp::Timestamp() :
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_msecs(0), _frameRate(0), _frameOffset(0) {
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}
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Timestamp::Timestamp(uint32 m, int frameRate) :
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_msecs(m), _frameRate(frameRate), _frameOffset(0) {
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}
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Timestamp Timestamp::addFrames(int frames) const {
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Timestamp timestamp(*this);
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timestamp._frameOffset += frames;
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if (timestamp._frameOffset < 0) {
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int secsub = 1 + (-timestamp._frameOffset / timestamp._frameRate);
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timestamp._frameOffset += timestamp._frameRate * secsub;
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timestamp._msecs -= secsub * 1000;
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}
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timestamp._msecs += (timestamp._frameOffset / timestamp._frameRate) * 1000;
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timestamp._frameOffset %= timestamp._frameRate;
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return timestamp;
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}
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int Timestamp::frameDiff(const Timestamp &b) const {
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assert(_frameRate == b._frameRate);
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int msecdelta = 0;
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if (_msecs != b._msecs)
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msecdelta = (long(_msecs) - long(b._msecs)) * _frameRate / 1000;
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return msecdelta + _frameOffset - b._frameOffset;
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}
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int Timestamp::msecsDiff(const Timestamp &b) const {
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return long(msecs()) - long(b.msecs());
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}
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uint32 Timestamp::msecs() const {
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return _msecs + _frameOffset * 1000L / _frameRate;
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}
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} // End of namespace Audio
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