64 lines
1.3 KiB
C
64 lines
1.3 KiB
C
#include <stdint.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "gate.h"
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#include <math.h>
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void gate_init(
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struct gate * gate
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) {
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gate->threshold = 0.0;
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gate->enable_calibration = false;
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gate->block_size = 1024;
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gate->cur_block_count = 0;
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gate->cur_block_sum = 0.0;
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gate->is_active = false;
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gate->cur_gain = 1.0;
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gate->attack = 1.0 / 128.0;
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gate->release = 1.0 / 8192.0;
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}
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void gate_process(
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struct gate * gate,
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size_t frame_size,
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float const * in,
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float * out
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) {
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bool act = false;
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for( size_t i = 0; i < frame_size; ++i ) {
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gate->cur_block_sum += fabs( in[i] );
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gate->cur_block_count += 1;
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if( gate->cur_block_count >= gate->block_size ) {
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//printf("new block sum %f, gain = %f\n", gate->cur_block_sum, gate->cur_gain);
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gate->last_block_sum = gate->cur_block_sum;
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gate->cur_block_sum = 0.0;
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if( gate->last_block_sum > 0.03 ) {
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act = true;
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} else {
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act = false;
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}
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}
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if( act ) {
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gate->cur_gain += gate->attack;
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if( gate->cur_gain > 1.0 ) {
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gate->cur_gain = 1.0;
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}
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} else {
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gate->cur_gain -= gate->release;
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if( gate->cur_gain < 0.0 ) {
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gate->cur_gain = 0.0;
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}
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}
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out[i] = in[i] * gate->cur_gain;
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}
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}
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