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69 lines
2.2 KiB
69 lines
2.2 KiB
/** @file */
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/* The MIT License
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*
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* Copyright (c) 2008, Naotoshi Seo <sonots(at)sonots.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef CV_WAITFPS_INCLUDED
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#define CV_WAITFPS_INCLUDED
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#include "cv.h"
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#include "cvaux.h"
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#include "cxcore.h"
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#include <time.h>
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/**
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* Wait amount of seconds per frame totally.
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*
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* If processing time exceeded the seconds per frame,
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* no wait occurs and negative waiting time is returned.
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*
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* Example)
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* @code
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* // #include <time.h>
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* clock_t start = clock();
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* fps = cvGetCaptureProperty(video, CV_CAP_PROP_FPS);
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* // process
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* cvWaitFps( fps, start );
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* @endcode
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*
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* @param fps Frame per second. fps video property
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* @param start Start time
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* @return Wait time
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*/
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clock_t cvWaitFps( double fps, clock_t start CV_DEFAULT(0) )
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{
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clock_t msec_per_frame = (clock_t)( 1.0 / (double) fps * 1000 );
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clock_t current = clock();
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clock_t wait_time;
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if( start == 0 ) {
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wait_time = msec_per_frame;
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} else {
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wait_time = msec_per_frame - (current - start);
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}
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//while( clock() - current < wait_time ) {}
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cvWaitKey( wait_time > 0 ? wait_time : 1 );
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return wait_time;
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}
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#endif
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