[FFmpeg-cvslog] r17845 - in trunk/libavformat: timefilter.c timefilter.h
michael
subversion
Fri Mar 6 01:44:12 CET 2009
Author: michael
Date: Fri Mar 6 01:44:12 2009
New Revision: 17845
Log:
Add clock_period parameter, this should makes the code easier to use.
Modified:
trunk/libavformat/timefilter.c
trunk/libavformat/timefilter.h
Modified: trunk/libavformat/timefilter.c
==============================================================================
--- trunk/libavformat/timefilter.c Fri Mar 6 01:26:51 2009 (r17844)
+++ trunk/libavformat/timefilter.c Fri Mar 6 01:44:12 2009 (r17845)
@@ -35,10 +35,10 @@ struct TimeFilter {
int count;
};
-TimeFilter * ff_timefilter_new(double feedback2_factor, double feedback3_factor)
+TimeFilter * ff_timefilter_new(double clock_period, double feedback2_factor, double feedback3_factor)
{
TimeFilter *self = av_mallocz(sizeof(TimeFilter));
- self->integrator2_state = 1.0;
+ self->integrator2_state = clock_period;
self->feedback2_factor = feedback2_factor;
self->feedback3_factor = feedback3_factor;
return self;
@@ -98,7 +98,7 @@ main(){
for(par0= bestpar0*0.8; par0<=bestpar0*1.21; par0+=bestpar0*0.05){
for(par1= bestpar1*0.8; par1<=bestpar1*1.21; par1+=bestpar1*0.05){
double error=0;
- TimeFilter *tf= ff_timefilter_new(par0, par1);
+ TimeFilter *tf= ff_timefilter_new(1, par0, par1);
for(i=0; i<SAMPLES; i++){
double filtered;
filtered= ff_timefilter_update(tf, samples[i], 1);
Modified: trunk/libavformat/timefilter.h
==============================================================================
--- trunk/libavformat/timefilter.h Fri Mar 6 01:26:51 2009 (r17844)
+++ trunk/libavformat/timefilter.h Fri Mar 6 01:44:12 2009 (r17845)
@@ -51,18 +51,22 @@ typedef struct TimeFilter TimeFilter;
* of the jitter, but also take a longer time for the loop to settle. A good
* starting point is something between 0.3 and 3 Hz.
*
+ * @param clock_period period of the hardware clock in seconds
+ * (for example 1.0/44100)
+ *
* For more details about these parameters and background concepts please see:
* http://www.kokkinizita.net/papers/usingdll.pdf
*/
-TimeFilter * ff_timefilter_new(double feedback2_factor, double feedback3_factor);
+TimeFilter * ff_timefilter_new(double clock_period, double feedback2_factor, double feedback3_factor);
/**
* Update the filter
*
* This function must be called in real time, at each process cycle.
*
- * period is the device cycle duration in seconds. For example, at
- * 44.1Hz and a buffer size of 512 frames, period = 512 / 44100.
+ * @param period the device cycle duration in clock_periods. For example, at
+ * 44.1kHz and a buffer size of 512 frames, period = 512 when clock_period
+ * was 1.0/44100, or 512/44100 if clock_period was 1.
*
* system_time, in seconds, should be the value of the system clock time,
* at (or as close as possible to) the moment the device hardware interrupt
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