1*05767d91SRobert Wu /* 2*05767d91SRobert Wu * Copyright 2015 The Android Open Source Project 3*05767d91SRobert Wu * 4*05767d91SRobert Wu * Licensed under the Apache License, Version 2.0 (the "License"); 5*05767d91SRobert Wu * you may not use this file except in compliance with the License. 6*05767d91SRobert Wu * You may obtain a copy of the License at 7*05767d91SRobert Wu * 8*05767d91SRobert Wu * http://www.apache.org/licenses/LICENSE-2.0 9*05767d91SRobert Wu * 10*05767d91SRobert Wu * Unless required by applicable law or agreed to in writing, software 11*05767d91SRobert Wu * distributed under the License is distributed on an "AS IS" BASIS, 12*05767d91SRobert Wu * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13*05767d91SRobert Wu * See the License for the specific language governing permissions and 14*05767d91SRobert Wu * limitations under the License. 15*05767d91SRobert Wu */ 16*05767d91SRobert Wu 17*05767d91SRobert Wu #ifndef FLOWGRAPH_CLIP_TO_RANGE_H 18*05767d91SRobert Wu #define FLOWGRAPH_CLIP_TO_RANGE_H 19*05767d91SRobert Wu 20*05767d91SRobert Wu #include <atomic> 21*05767d91SRobert Wu #include <unistd.h> 22*05767d91SRobert Wu #include <sys/types.h> 23*05767d91SRobert Wu 24*05767d91SRobert Wu #include "FlowGraphNode.h" 25*05767d91SRobert Wu 26*05767d91SRobert Wu namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph { 27*05767d91SRobert Wu 28*05767d91SRobert Wu // This is 3 dB, (10^(3/20)), to match the maximum headroom in AudioTrack for float data. 29*05767d91SRobert Wu // It is designed to allow occasional transient peaks. 30*05767d91SRobert Wu constexpr float kDefaultMaxHeadroom = 1.41253754f; 31*05767d91SRobert Wu constexpr float kDefaultMinHeadroom = -kDefaultMaxHeadroom; 32*05767d91SRobert Wu 33*05767d91SRobert Wu class ClipToRange : public FlowGraphFilter { 34*05767d91SRobert Wu public: 35*05767d91SRobert Wu explicit ClipToRange(int32_t channelCount); 36*05767d91SRobert Wu 37*05767d91SRobert Wu virtual ~ClipToRange() = default; 38*05767d91SRobert Wu 39*05767d91SRobert Wu int32_t onProcess(int32_t numFrames) override; 40*05767d91SRobert Wu setMinimum(float min)41*05767d91SRobert Wu void setMinimum(float min) { 42*05767d91SRobert Wu mMinimum = min; 43*05767d91SRobert Wu } 44*05767d91SRobert Wu getMinimum()45*05767d91SRobert Wu float getMinimum() const { 46*05767d91SRobert Wu return mMinimum; 47*05767d91SRobert Wu } 48*05767d91SRobert Wu setMaximum(float min)49*05767d91SRobert Wu void setMaximum(float min) { 50*05767d91SRobert Wu mMaximum = min; 51*05767d91SRobert Wu } 52*05767d91SRobert Wu getMaximum()53*05767d91SRobert Wu float getMaximum() const { 54*05767d91SRobert Wu return mMaximum; 55*05767d91SRobert Wu } 56*05767d91SRobert Wu getName()57*05767d91SRobert Wu const char *getName() override { 58*05767d91SRobert Wu return "ClipToRange"; 59*05767d91SRobert Wu } 60*05767d91SRobert Wu 61*05767d91SRobert Wu private: 62*05767d91SRobert Wu float mMinimum = kDefaultMinHeadroom; 63*05767d91SRobert Wu float mMaximum = kDefaultMaxHeadroom; 64*05767d91SRobert Wu }; 65*05767d91SRobert Wu 66*05767d91SRobert Wu } /* namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph */ 67*05767d91SRobert Wu 68*05767d91SRobert Wu #endif //FLOWGRAPH_CLIP_TO_RANGE_H 69