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_INTERPOLATING_DELAY_LINE_H 18 #define OBOETESTER_INTERPOLATING_DELAY_LINE_H 19 20 #include <memory> 21 #include <unistd.h> 22 #include <sys/types.h> 23 24 #include "oboe/Oboe.h" 25 #include "FullDuplexStream.h" 26 27 /** 28 * Monophonic delay line. 29 */ 30 class InterpolatingDelayLine { 31 public: 32 explicit InterpolatingDelayLine(int32_t delaySize); 33 34 /** 35 * @param input sample to be written to the delay line 36 * @param delay number of samples to delay the output 37 * @return delayed value 38 */ 39 float process(float delay, float input); 40 41 private: 42 std::unique_ptr<float[]> mDelayLine; 43 int32_t mCursor = 0; 44 int32_t mDelaySize = 0; 45 }; 46 47 48 #endif //OBOETESTER_INTERPOLATING_DELAY_LINE_H 49