103 lines
1.9 KiB
C
103 lines
1.9 KiB
C
/*
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* @brief SMA buffer.
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*
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* Contributor(s):
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*
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* Eric des Courtis <eric.des.courtis@benbria.com>
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* Piotr Gregor <piotrgregor@rsyncme.org>
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*/
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#ifndef __AVMD_SMA_BUFFER_H__
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#define __AVMD_SMA_BUFFER_H__
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#include <stdio.h>
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#include <stdlib.h>
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#ifndef _MSC_VER
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#include <stdint.h>
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#endif
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#include <string.h>
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#include <assert.h>
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#include "avmd_buffer.h"
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typedef struct {
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size_t len;
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BUFF_TYPE *data;
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BUFF_TYPE sma;
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size_t pos;
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size_t lpos;
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} sma_buffer_t;
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#define INIT_SMA_BUFFER(b, l, s) \
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{ \
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(void)memset((b), 0, sizeof(sma_buffer_t)); \
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(b)->len = (l); \
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(b)->data = (BUFF_TYPE *)switch_core_session_alloc((s), sizeof(BUFF_TYPE) * (l)); \
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(b)->sma = 0.0; \
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(b)->pos = 0; \
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(b)->lpos = 0; \
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}
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#define GET_SMA_SAMPLE(b, p) ((b)->data[(p) % (b)->len])
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#define SET_SMA_SAMPLE(b, p, v) ((b)->data[(p) % (b)->len] = (v))
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#define GET_CURRENT_SMA_POS(b) ((b)->pos)
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#define GET_CURRENT_SMA_LPOS(b) ((b)->lpos)
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#define INC_SMA_POS(b) \
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{ \
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((b)->lpos + 1 < 2 * (b)->len) ? ((b)->lpos++) : ((b)->lpos = (b)->len); \
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(b)->pos = (b)->lpos % (b)->len; \
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}
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#define APPEND_SMA_VAL(b, v) \
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{ \
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(b)->sma -= ((b)->data[(b)->pos] / (BUFF_TYPE)(b)->len); \
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(b)->data[(b)->pos] = (v); \
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(((b)->lpos) >= ((b)->len)) ? ((b)->sma += ((b)->data[(b)->pos] / (BUFF_TYPE)(b)->len)) : \
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((b)->sma = ((((b)->sma)*((b)->pos)) + ((b)->data[(b)->pos])) / ((BUFF_TYPE)(((b)->pos) + 1))) ; \
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INC_SMA_POS(b); \
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}
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#define RESET_SMA_BUFFER(b) \
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{ \
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(b)->sma = 0.0; \
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(void)memset((b)->data, 0, sizeof(BUFF_TYPE) * (b)->len); \
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(b)->pos = 0; \
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(b)->lpos = 0; \
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}
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/*
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#define DESTROY_SMA_BUFFER(b) \
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do{ \
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free((b)->data); \
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}while(0);
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*/
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#endif /* __AVMD_SMA_BUFFER_H__ */
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/*
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int main(void)
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{
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int i;
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sma_buffer_t b;
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INIT_SMA_BUFFER(&b, 100);
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for(i = 0; i < 20; i++){
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APPEND_SMA_VAL(&b, 100.0);
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printf("SMA = %lf\n", b.sma);
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}
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DESTROY_SMA_BUFFER(&b);
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return EXIT_SUCCESS;
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}
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*/
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