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30 lines
1.1 KiB
C++
30 lines
1.1 KiB
C++
#include "stdafx.h"
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#include "StereoCombFilter.h"
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void StereoCombFilter::ApplyFilter(int16_t * stereoBuffer, size_t sampleCount, uint32_t sampleRate, int32_t delay, uint32_t strength)
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{
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size_t delaySampleCount = (int32_t)((double)delay / 1000 * sampleRate);
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if(delaySampleCount != _lastDelay) {
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_delayedSamplesLeft.clear();
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_delayedSamplesRight.clear();
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for(size_t i = 0; i < delaySampleCount; i++) {
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_delayedSamplesLeft.push_back(0);
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_delayedSamplesRight.push_back(0);
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}
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}
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_lastDelay = delaySampleCount;
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double ratio = strength == 0 ? 0 : strength / 100.0;
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for(size_t i = 0; i < sampleCount * 2; i += 2) {
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_delayedSamplesLeft.push_back(stereoBuffer[i]);
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_delayedSamplesRight.push_back(stereoBuffer[i + 1]);
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int16_t delayedSample = (_delayedSamplesRight.front() + _delayedSamplesLeft.front()) / 2;
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int16_t monoSample = (stereoBuffer[i] + stereoBuffer[i + 1]) / 2;
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stereoBuffer[i] = monoSample + (int16_t)(delayedSample * ratio);
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stereoBuffer[i + 1] = monoSample - (int16_t)(delayedSample * ratio);
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_delayedSamplesLeft.pop_front();
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_delayedSamplesRight.pop_front();
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}
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}
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