1 /* 2 * Copyright 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <unistd.h> 18 #include "FlowGraphNode.h" 19 #include "ChannelCountConverter.h" 20 21 using namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph; 22 ChannelCountConverter(int32_t inputChannelCount,int32_t outputChannelCount)23ChannelCountConverter::ChannelCountConverter( 24 int32_t inputChannelCount, 25 int32_t outputChannelCount) 26 : input(*this, inputChannelCount) 27 , output(*this, outputChannelCount) { 28 } 29 ~ChannelCountConverter()30ChannelCountConverter::~ChannelCountConverter() { } 31 onProcess(int32_t numFrames)32int32_t ChannelCountConverter::onProcess(int32_t numFrames) { 33 const float *inputBuffer = input.getBuffer(); 34 float *outputBuffer = output.getBuffer(); 35 int32_t inputChannelCount = input.getSamplesPerFrame(); 36 int32_t outputChannelCount = output.getSamplesPerFrame(); 37 for (int i = 0; i < numFrames; i++) { 38 int inputChannel = 0; 39 for (int outputChannel = 0; outputChannel < outputChannelCount; outputChannel++) { 40 // Copy input channels to output channels. 41 // Wrap if we run out of inputs. 42 // Discard if we run out of outputs. 43 outputBuffer[outputChannel] = inputBuffer[inputChannel]; 44 inputChannel = (inputChannel == inputChannelCount) 45 ? 0 : inputChannel + 1; 46 } 47 inputBuffer += inputChannelCount; 48 outputBuffer += outputChannelCount; 49 } 50 return numFrames; 51 } 52 53