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Reorder operations, 20% improved performance, 1 variable less.

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Originally committed as revision 17839 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2009-03-05 23:57:42 +00:00
parent f982c6d87a
commit 28e947e458
1 changed files with 4 additions and 5 deletions
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9
libavformat/timefilter.c
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@ -29,7 +29,6 @@ struct TimeFilter {
/// Delay Locked Loop data. These variables refer to mathematical
/// concepts described in: http://www.kokkinizita.net/papers/usingdll.pdf
double cycle_time;
double next_cycle_time;
double feedback2_factor;
double feedback3_factor;
double integrator2_state;
@ -59,14 +58,14 @@ void ff_timefilter_update(TimeFilter *self, double system_time)
if (!self->cycle_time) {
/// init loop
self->cycle_time = system_time;
self->next_cycle_time = self->cycle_time + self->integrator2_state;
} else {
double loop_error;
self->cycle_time+= self->integrator2_state;
/// calculate loop error
double loop_error = system_time - self->next_cycle_time;
loop_error = system_time - self->cycle_time;
/// update loop
self->cycle_time = self->next_cycle_time;
self->next_cycle_time += self->feedback2_factor * loop_error + self->integrator2_state;
self->cycle_time += self->feedback2_factor * loop_error;
self->integrator2_state += self->feedback3_factor * loop_error;
}
}