1 /* 2 * Copyright 2018 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 19 #include "ManyToMultiConverter.h" 20 21 using namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph; 22 ManyToMultiConverter(int32_t channelCount)23ManyToMultiConverter::ManyToMultiConverter(int32_t channelCount) 24 : inputs(channelCount) 25 , output(*this, channelCount) { 26 for (int i = 0; i < channelCount; i++) { 27 inputs[i] = std::make_unique<FlowGraphPortFloatInput>(*this, 1); 28 } 29 } 30 onProcess(int32_t numFrames)31int32_t ManyToMultiConverter::onProcess(int32_t numFrames) { 32 int32_t channelCount = output.getSamplesPerFrame(); 33 34 for (int ch = 0; ch < channelCount; ch++) { 35 const float *inputBuffer = inputs[ch]->getBuffer(); 36 float *outputBuffer = output.getBuffer() + ch; 37 38 for (int i = 0; i < numFrames; i++) { 39 // read one, write into the proper interleaved output channel 40 float sample = *inputBuffer++; 41 *outputBuffer = sample; 42 outputBuffer += channelCount; // advance to next multichannel frame 43 } 44 } 45 return numFrames; 46 } 47 48