47 lines
1.4 KiB
C++
Vendored
47 lines
1.4 KiB
C++
Vendored
/*
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* Copyright 2021 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 <unistd.h>
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#include "oboe_flowgraph_MonoBlend_android.h"
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using namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph;
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MonoBlend::MonoBlend(int32_t channelCount)
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: FlowGraphFilter(channelCount)
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, mInvChannelCount(1. / channelCount)
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{
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}
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int32_t MonoBlend::onProcess(int32_t numFrames) {
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int32_t channelCount = output.getSamplesPerFrame();
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const float *inputBuffer = input.getBuffer();
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float *outputBuffer = output.getBuffer();
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for (size_t i = 0; i < numFrames; ++i) {
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float accum = 0;
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for (size_t j = 0; j < channelCount; ++j) {
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accum += *inputBuffer++;
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}
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accum *= mInvChannelCount;
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for (size_t j = 0; j < channelCount; ++j) {
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*outputBuffer++ = accum;
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}
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}
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return numFrames;
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}
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