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 /** 25 * Monophonic delay line. 26 */ 27 class InterpolatingDelayLine { 28 public: 29 explicit InterpolatingDelayLine(int32_t delaySize); 30 31 /** 32 * @param input sample to be written to the delay line 33 * @param delay number of samples to delay the output 34 * @return delayed value 35 */ 36 float process(float delay, float input); 37 38 private: 39 std::unique_ptr<float[]> mDelayLine; 40 int32_t mCursor = 0; 41 int32_t mDelaySize = 0; 42 }; 43 44 45 #endif //OBOETESTER_INTERPOLATING_DELAY_LINE_H 46