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76 lines
2.2 KiB
C++
76 lines
2.2 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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#ifndef SOUND_TIMESTAMP_H
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#define SOUND_TIMESTAMP_H
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#include "common/scummsys.h"
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namespace Audio {
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/**
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* Timestamps allow measuring times with a sub-millisecond granularity,
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* and without rounding losses. This is achieved by measuring frames
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* instead of milliseconds: Specify an initial time in milliseconds
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* plus framerate (in frames per second).
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*/
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class Timestamp {
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protected:
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uint32 _msecs;
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int _frameRate;
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int _frameOffset;
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/* Total time: msecs + frame_offset/frame_rate */
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public:
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Timestamp();
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/**
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* Set up a timestamp with a given time and framerate.
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* @param msecs staring time in milliseconds
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* @param frameRate number of frames per second
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*/
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Timestamp(uint32 msecs, int frameRate);
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/** Adds a number of frames to a timestamp. */
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Timestamp addFrames(int frames) const;
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/** Adds a number of milliseconds to a timestamp. */
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Timestamp addMsecs(int ms) const;
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/** Computes the difference (# of frames) between this timestamp and b. */
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int frameDiff(const Timestamp &b) const;
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/** Computes the difference (# of milliseconds) between this timestamp and b. */
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int msecsDiff(const Timestamp &b) const;
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/** Determines the time in milliseconds described by this timestamp. */
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uint32 msecs() const;
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};
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} // End of namespace Audio
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#endif
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