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 #ifndef SAMPLES_FULLDUPLEXPASS_H 18 #define SAMPLES_FULLDUPLEXPASS_H 19 20 class FullDuplexPass : public oboe::FullDuplexStream { 21 public: 22 virtual oboe::DataCallbackResult onBothStreamsReady(const void * inputData,int numInputFrames,void * outputData,int numOutputFrames)23 onBothStreamsReady( 24 const void *inputData, 25 int numInputFrames, 26 void *outputData, 27 int numOutputFrames) { 28 // Copy the input samples to the output with a little arbitrary gain change. 29 30 // This code assumes the data format for both streams is Float. 31 const float *inputFloats = static_cast<const float *>(inputData); 32 float *outputFloats = static_cast<float *>(outputData); 33 34 // It also assumes the channel count for each stream is the same. 35 int32_t samplesPerFrame = getOutputStream()->getChannelCount(); 36 int32_t numInputSamples = numInputFrames * samplesPerFrame; 37 int32_t numOutputSamples = numOutputFrames * samplesPerFrame; 38 39 // It is possible that there may be fewer input than output samples. 40 int32_t samplesToProcess = std::min(numInputSamples, numOutputSamples); 41 for (int32_t i = 0; i < samplesToProcess; i++) { 42 *outputFloats++ = *inputFloats++ * 0.95; // do some arbitrary processing 43 } 44 45 // If there are fewer input samples then clear the rest of the buffer. 46 int32_t samplesLeft = numOutputSamples - numInputSamples; 47 for (int32_t i = 0; i < samplesLeft; i++) { 48 *outputFloats++ = 0.0; // silence 49 } 50 51 return oboe::DataCallbackResult::Continue; 52 } 53 }; 54 #endif //SAMPLES_FULLDUPLEXPASS_H 55