1 /* 2 * Copyright 2015 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 FLOWGRAPH_CLIP_TO_RANGE_H 18 #define FLOWGRAPH_CLIP_TO_RANGE_H 19 20 #include <atomic> 21 #include <unistd.h> 22 #include <sys/types.h> 23 24 #include "AudioProcessorBase.h" 25 26 namespace flowgraph { 27 28 // This is 3 dB, (10^(3/20)), to match the maximum headroom in AudioTrack for float data. 29 // It is designed to allow occasional transient peaks. 30 constexpr float kDefaultMaxHeadroom = 1.41253754f; 31 constexpr float kDefaultMinHeadroom = -kDefaultMaxHeadroom; 32 33 class ClipToRange : public AudioProcessorBase { 34 public: 35 explicit ClipToRange(int32_t channelCount); 36 37 virtual ~ClipToRange() = default; 38 39 int32_t onProcess(int64_t framePosition, int32_t numFrames) override; 40 setMinimum(float min)41 void setMinimum(float min) { 42 mMinimum = min; 43 } 44 getMinimum()45 float getMinimum() const { 46 return mMinimum; 47 } 48 setMaximum(float min)49 void setMaximum(float min) { 50 mMaximum = min; 51 } 52 getMaximum()53 float getMaximum() const { 54 return mMaximum; 55 } 56 57 AudioFloatInputPort input; 58 AudioFloatOutputPort output; 59 60 private: 61 float mMinimum = kDefaultMinHeadroom; 62 float mMaximum = kDefaultMaxHeadroom; 63 }; 64 65 } /* namespace flowgraph */ 66 67 #endif //FLOWGRAPH_CLIP_TO_RANGE_H 68