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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#include "sci/sfx/sfx_time.h"
#include "sci/tools.h"
namespace Sci {
sfx_timestamp_t sfx_new_timestamp(const uint32 msecs, const int frame_rate) {
sfx_timestamp_t r;
r.msecs = msecs;
r.frame_rate = frame_rate;
r.frame_offset = 0;
return r;
}
sfx_timestamp_t sfx_timestamp_add(sfx_timestamp_t timestamp, int frames) {
timestamp.frame_offset += frames;
if (timestamp.frame_offset < 0) {
int secsub = 1 + (-timestamp.frame_offset / timestamp.frame_rate);
timestamp.frame_offset += timestamp.frame_rate * secsub;
timestamp.msecs -= secsub * 1000;
}
timestamp.msecs += (timestamp.frame_offset / timestamp.frame_rate) * 1000;
timestamp.frame_offset %= timestamp.frame_rate;
return timestamp;
}
int sfx_timestamp_frame_diff(sfx_timestamp_t a, sfx_timestamp_t b) {
int msecdelta = 0;
if (a.frame_rate != b.frame_rate) {
fprintf(stderr, "Fatal: The semantics of subtracting two timestamps with a different base from each other is not defined!\n");
BREAKPOINT();
}
if (a.msecs != b.msecs)
msecdelta = (long(a.msecs) - long(b.msecs)) * a.frame_rate / 1000;
return msecdelta + a.frame_offset - b.frame_offset;
}
int sfx_timestamp_msecs_diff(sfx_timestamp_t t1, sfx_timestamp_t t2) {
uint32 msecs1, msecs2;
sfx_timestamp_gettime(&t1, &msecs1);
sfx_timestamp_gettime(&t2, &msecs2);
return long(msecs1) - long(msecs2);
}
sfx_timestamp_t sfx_timestamp_renormalise(sfx_timestamp_t timestamp, int new_freq) {
sfx_timestamp_t r;
sfx_timestamp_gettime(×tamp, &r.msecs);
r.frame_rate = new_freq;
r.frame_offset = 0;
return r;
}
void sfx_timestamp_gettime(sfx_timestamp_t *timestamp, uint32 *msecs) {
*msecs = timestamp->msecs +
timestamp->frame_offset * 1000l / timestamp->frame_rate;
}
} // End of namespace Sci
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