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signpr_mean.c
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signpr_mean.c
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/* Simple Mean Filter
* Copyright (C) 1998 J.A. Bezemer
*
* Licensed under the terms of the GNU General Public License.
* ABSOLUTELY NO WARRANTY.
* See the file `COPYING' in this directory.
*/
#include "signpr_mean.h"
#include "signpr_general.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
void
simple_mean_param_defaults (parampointer_t parampointer)
{
parampointer->postlength1 = 1;
parampointer->prelength1 = 1;
}
void
init_simple_mean_filter (int filterno, parampointer_t parampointer)
{
parampointer->buffer = init_buffer (parampointer->postlength1,
parampointer->prelength1);
parampointer->filterno = filterno;
}
void
delete_simple_mean_filter (parampointer_t parampointer)
{
delete_buffer (¶mpointer->buffer);
}
sample_t
simple_mean_filter (parampointer_t parampointer)
{
longsample_t sum;
sample_t sample;
long i;
advance_current_pos (¶mpointer->buffer, parampointer->filterno);
sum.left = 0;
sum.right = 0;
for (i = 0; i <= parampointer->postlength1 + parampointer->prelength1;
i++)
{
sample = get_from_buffer (¶mpointer->buffer,
i - parampointer->postlength1);
sum.left += sample.left;
sum.right += sample.right;
}
sample.left = sum.left / (parampointer->postlength1 +
parampointer->prelength1 + 1);
sample.right = sum.right / (parampointer->postlength1 +
parampointer->prelength1 + 1);
return sample;
}