43 lines
1.6 KiB
C++
Vendored
43 lines
1.6 KiB
C++
Vendored
/*
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* Copyright 2019 The Android Open Source Project
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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 "oboe_flowgraph_resampler_LinearResampler_android.h"
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using namespace RESAMPLER_OUTER_NAMESPACE::resampler;
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LinearResampler::LinearResampler(const MultiChannelResampler::Builder &builder)
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: MultiChannelResampler(builder) {
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mPreviousFrame = std::make_unique<float[]>(getChannelCount());
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mCurrentFrame = std::make_unique<float[]>(getChannelCount());
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}
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void LinearResampler::writeFrame(const float *frame) {
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memcpy(mPreviousFrame.get(), mCurrentFrame.get(), sizeof(float) * getChannelCount());
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memcpy(mCurrentFrame.get(), frame, sizeof(float) * getChannelCount());
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}
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void LinearResampler::readFrame(float *frame) {
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float *previous = mPreviousFrame.get();
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float *current = mCurrentFrame.get();
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float phase = (float) getIntegerPhase() / mDenominator;
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// iterate across samples in the frame
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for (int channel = 0; channel < getChannelCount(); channel++) {
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float f0 = *previous++;
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float f1 = *current++;
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*frame++ = f0 + (phase * (f1 - f0));
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}
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}
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