80 lines
2.5 KiB
C++
80 lines
2.5 KiB
C++
/*******************************************************************************
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* Copyright 2009-2025 Jörg Müller
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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******************************************************************************/
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#include "fx/EchoReader.h"
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#include <cstring>
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#include "IReader.h"
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#include "util/Buffer.h"
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AUD_NAMESPACE_BEGIN
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EchoReader::EchoReader(std::shared_ptr<IReader> reader, float delay, float feedback, float mix, bool resetBuffer) :
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EffectReader(reader), m_delay(delay), m_feedback(feedback), m_mix(mix), m_resetBuffer(resetBuffer)
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{
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}
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void EchoReader::read(int& length, bool& eos, sample_t* buffer)
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{
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auto specs = m_reader->getSpecs();
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auto delaySamples = static_cast<int>(m_delay * specs.rate);
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m_inBuffer.assureSize(length * AUD_SAMPLE_SIZE(specs));
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// Note: should this ever do something another time than in the beginning,
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// it will likely cause an audible glitch, as samples are not reordered
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m_delayBuffer.assureSize(delaySamples * AUD_SAMPLE_SIZE(specs));
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m_reader->read(length, eos, m_inBuffer.getBuffer());
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sample_t* delayBuffer = m_delayBuffer.getBuffer();
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for(int i = 0; i < length; i++)
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{
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for(int channel = 0; channel < specs.channels; channel++)
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{
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int delayPosition = ((m_writePosition + i) % delaySamples) * specs.channels + channel;
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sample_t inSample = m_inBuffer.getBuffer()[i * specs.channels + channel];
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sample_t delayedSample = delayPosition < m_samplesAvailable * specs.channels ? delayBuffer[delayPosition] : 0;
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sample_t outSample = inSample + delayedSample * m_feedback;
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buffer[i * specs.channels + channel] = inSample * (1.0f - m_mix) + outSample * m_mix;
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// Update delay buffer with feedback
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delayBuffer[delayPosition] = outSample;
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}
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}
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m_writePosition = (m_writePosition + length) % delaySamples;
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m_samplesAvailable = std::min(delaySamples, m_samplesAvailable + length);
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}
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void EchoReader::seek(int position)
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{
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m_reader->seek(position);
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if(m_resetBuffer)
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{
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m_samplesAvailable = 0;
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m_writePosition = 0;
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}
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}
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AUD_NAMESPACE_END
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