1 /* 2 * Copyright (C) 2018 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 18 #ifndef DPFREQUENCY_H_ 19 #define DPFREQUENCY_H_ 20 21 #include <Eigen/Dense> 22 #include <unsupported/Eigen/FFT> 23 24 #include "RDsp.h" 25 #include "SHCircularBuffer.h" 26 27 #include "DPBase.h" 28 29 30 namespace dp_fx { 31 32 using FXBuffer = SHCircularBuffer<float>; 33 34 class ChannelBuffer { 35 public: 36 FXBuffer cBInput; // Circular Buffer input 37 FXBuffer cBOutput; // Circular Buffer output 38 FloatVec input; // time domain temp vector for input 39 FloatVec output; // time domain temp vector for output 40 FloatVec outTail; // time domain temp vector for output tail (for overlap-add method) 41 42 Eigen::VectorXcf complexTemp; // complex temp vector for frequency domain operations 43 44 //Current parameters 45 float inputGainDb; 46 float outputGainDb; 47 struct BandParams { 48 bool enabled; 49 float freqCutoffHz; 50 size_t binStart; 51 size_t binStop; 52 }; 53 struct EqBandParams : public BandParams { 54 float gainDb; 55 }; 56 struct MbcBandParams : public BandParams { 57 float gainPreDb; 58 float gainPostDb; 59 float attackTimeMs; 60 float releaseTimeMs; 61 float ratio; 62 float thresholdDb; 63 float kneeWidthDb; 64 float noiseGateThresholdDb; 65 float expanderRatio; 66 67 //Historic values 68 float previousEnvelope; 69 }; 70 struct LimiterParams { 71 int32_t linkGroup; 72 float attackTimeMs; 73 float releaseTimeMs; 74 float ratio; 75 float thresholdDb; 76 float postGainDb; 77 78 //Historic values 79 float previousEnvelope; 80 float newFactor; 81 float linkFactor; 82 }; 83 84 bool mPreEqInUse; 85 bool mPreEqEnabled; 86 std::vector<EqBandParams> mPreEqBands; 87 88 bool mMbcInUse; 89 bool mMbcEnabled; 90 std::vector<MbcBandParams> mMbcBands; 91 92 bool mPostEqInUse; 93 bool mPostEqEnabled; 94 std::vector<EqBandParams> mPostEqBands; 95 96 bool mLimiterInUse; 97 bool mLimiterEnabled; 98 LimiterParams mLimiterParams; 99 FloatVec mPreEqFactorVector; // temp pre-computed vector to shape spectrum at preEQ stage 100 FloatVec mPostEqFactorVector; // temp pre-computed vector to shape spectrum at postEQ stage 101 102 void initBuffers(unsigned int blockSize, unsigned int overlapSize, unsigned int halfFftSize, 103 unsigned int samplingRate, DPBase &dpBase); 104 void computeBinStartStop(BandParams &bp, size_t binStart); 105 private: 106 unsigned int mSamplingRate; 107 unsigned int mBlockSize; 108 109 }; 110 111 using CBufferVector = std::vector<ChannelBuffer>; 112 113 using GroupsMap = std::map<int32_t, IntVec>; 114 115 class LinkedLimiters { 116 public: 117 void reset(); 118 void update(int32_t group, int index); 119 void remove(int index); 120 GroupsMap mGroupsMap; 121 }; 122 123 class DPFrequency : public DPBase { 124 public: 125 virtual size_t processSamples(const float *in, float *out, size_t samples); 126 virtual void reset(); 127 void configure(size_t blockSize, size_t overlapSize, size_t samplingRate); 128 static size_t getMinBockSize(); 129 static size_t getMaxBockSize(); 130 131 private: 132 void updateParameters(ChannelBuffer &cb, int channelIndex); 133 size_t processMono(ChannelBuffer &cb); 134 size_t processOneVector(FloatVec &output, FloatVec &input, ChannelBuffer &cb); 135 136 size_t processChannelBuffers(CBufferVector &channelBuffers); 137 size_t processFirstStages(ChannelBuffer &cb); 138 size_t processLastStages(ChannelBuffer &cb); 139 void processLinkedLimiters(CBufferVector &channelBuffers); 140 141 size_t mBlockSize; 142 size_t mHalfFFTSize; 143 size_t mOverlapSize; 144 size_t mSamplingRate; 145 146 float mBlocksPerSecond; 147 148 CBufferVector mChannelBuffers; 149 150 LinkedLimiters mLinkedLimiters; 151 152 //dsp 153 FloatVec mVWindow; //window class. 154 float mWindowRms; 155 Eigen::FFT<float> mFftServer; 156 }; 157 158 } //namespace dp_fx 159 160 #endif // DPFREQUENCY_H_ 161