text: /*
   * Copyright 2015 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #include <unistd.h>
  #include "oboe_flowgraph_FlowGraphNode_android.h"
  #include "oboe_flowgraph_MultiToMonoConverter_android.h"
  
  using namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph;
  
  MultiToMonoConverter::MultiToMonoConverter(int32_t inputChannelCount)
          : input(*this, inputChannelCount)
          , output(*this, 1) {
  }
  
  MultiToMonoConverter::~MultiToMonoConverter() { }
  
  int32_t MultiToMonoConverter::onProcess(int32_t numFrames) {
      const float *inputBuffer = input.getBuffer();
      float *outputBuffer = output.getBuffer();
      int32_t channelCount = input.getSamplesPerFrame();
      for (int i = 0; i < numFrames; i++) {
          // read first channel of multi stream, write many
          *outputBuffer++ = *inputBuffer;
          inputBuffer += channelCount;
      }
      return numFrames;
  }
  
  