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 OBOE_SINC_RESAMPLER_H 18 #define OBOE_SINC_RESAMPLER_H 19 20 #include <memory> 21 #include <sys/types.h> 22 #include <unistd.h> 23 #include "MultiChannelResampler.h" 24 25 namespace resampler { 26 27 /** 28 * Resampler that can interpolate between coefficients. 29 * This can be used to support arbitrary ratios. 30 */ 31 class SincResampler : public MultiChannelResampler { 32 public: 33 explicit SincResampler(const MultiChannelResampler::Builder &builder); 34 35 virtual ~SincResampler() = default; 36 37 void readFrame(float *frame) override; 38 39 protected: 40 41 std::vector<float> mSingleFrame2; // for interpolation 42 int32_t mNumRows = 0; 43 double mPhaseScaler = 1.0; 44 }; 45 46 } 47 #endif //OBOE_SINC_RESAMPLER_H 48