1 /* 2 * Copyright 2019 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 OBOETESTER_FULL_DUPLEX_ECHO_H 18 #define OBOETESTER_FULL_DUPLEX_ECHO_H 19 20 #include <unistd.h> 21 #include <sys/types.h> 22 23 #include "oboe/Oboe.h" 24 #include "FullDuplexStream.h" 25 #include "InterpolatingDelayLine.h" 26 27 class FullDuplexEcho : public FullDuplexStream { 28 public: FullDuplexEcho()29 FullDuplexEcho() { 30 setMNumInputBurstsCushion(0); 31 } 32 33 /** 34 * Called when data is available on both streams. 35 * Caller should override this method. 36 */ 37 oboe::DataCallbackResult onBothStreamsReady( 38 const void *inputData, 39 int numInputFrames, 40 void *outputData, 41 int numOutputFrames 42 ) override; 43 44 oboe::Result start() override; 45 setDelayTime(double delayTimeSeconds)46 void setDelayTime(double delayTimeSeconds) { 47 mDelayTimeSeconds = delayTimeSeconds; 48 } 49 50 private: 51 std::unique_ptr<InterpolatingDelayLine> mDelayLine; 52 static constexpr double kMaxDelayTimeSeconds = 4.0; 53 double mDelayTimeSeconds = kMaxDelayTimeSeconds; 54 }; 55 56 57 #endif //OBOETESTER_FULL_DUPLEX_ECHO_H 58