20 lines
535 B
C
20 lines
535 B
C
#include "iir_filter.h"
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typedef struct samplerate {
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double factor;
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struct {
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iir_filter_t lp;
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sample_t last_sample;
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double in_index;
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} down;
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struct {
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iir_filter_t lp;
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sample_t last_sample;
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double in_index;
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} up;
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} samplerate_t;
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int init_samplerate(samplerate_t *state, double low_samplerate, double high_samplerate, double filter_cutoff);
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int samplerate_downsample(samplerate_t *state, sample_t *samples, int input_num);
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int samplerate_upsample(samplerate_t *state, sample_t *input, int input_num, sample_t *output);
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