53 lines
1.9 KiB
C++
Vendored
53 lines
1.9 KiB
C++
Vendored
/*
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* Copyright 2015 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_FlowGraphNode_android.h"
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#include "oboe_flowgraph_ChannelCountConverter_android.h"
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using namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph;
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ChannelCountConverter::ChannelCountConverter(
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int32_t inputChannelCount,
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int32_t outputChannelCount)
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: input(*this, inputChannelCount)
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, output(*this, outputChannelCount) {
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}
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ChannelCountConverter::~ChannelCountConverter() = default;
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int32_t ChannelCountConverter::onProcess(int32_t numFrames) {
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const float *inputBuffer = input.getBuffer();
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float *outputBuffer = output.getBuffer();
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int32_t inputChannelCount = input.getSamplesPerFrame();
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int32_t outputChannelCount = output.getSamplesPerFrame();
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for (int i = 0; i < numFrames; i++) {
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int inputChannel = 0;
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for (int outputChannel = 0; outputChannel < outputChannelCount; outputChannel++) {
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// Copy input channels to output channels.
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// Wrap if we run out of inputs.
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// Discard if we run out of outputs.
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outputBuffer[outputChannel] = inputBuffer[inputChannel];
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inputChannel = (inputChannel == inputChannelCount)
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? 0 : inputChannel + 1;
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}
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inputBuffer += inputChannelCount;
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outputBuffer += outputChannelCount;
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}
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return numFrames;
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}
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