| 1 | /** |
| 2 | * This is a reusable equalizer class that lets you get averaged |
| 3 | * bands with dB scaling and smoothing. |
| 4 | */ |
| 5 | public static class GraphicEQ { |
| 6 | |
| 7 | private final HeronLX lx; |
| 8 | |
| 9 | public final BasicParameter level = new BasicParameter("LVL", 0.5); |
| 10 | public final BasicParameter range = new BasicParameter("RNGE", 0.5); |
| 11 | public final BasicParameter slope = new BasicParameter("SLOP", 0.5); |
| 12 | public final BasicParameter attack = new BasicParameter("ATK", 0.5); |
| 13 | public final BasicParameter release = new BasicParameter("REL", 0.5); |
| 14 | |
| 15 | private final FFT fft; |
| 16 | private final int numBands; |
| 17 | |
| 18 | private final LinearEnvelope[] bandVals; |
| 19 | |
| 20 | public final static int DEFAULT_NUM_BANDS = 16; |
| 21 | |
| 22 | public GraphicEQ(HeronLX lx) { |
| 23 | this(lx, DEFAULT_NUM_BANDS); |
| 24 | } |
| 25 | |
| 26 | /** |
| 27 | * Note that the number of bands is a suggestion. Due to the FFT implementation |
| 28 | * the actual number may be slightly different. |
| 29 | */ |
| 30 | public GraphicEQ(HeronLX lx, int num) { |
| 31 | this.lx = lx; |
| 32 | fft = new FFT(lx.audioInput().bufferSize(), lx.audioInput().sampleRate()); |
| 33 | fft.window(FFT.HAMMING); |
| 34 | fft.logAverages(50, num/8); |
| 35 | numBands = this.fft.avgSize(); |
| 36 | bandVals = new LinearEnvelope[numBands]; |
| 37 | for (int i = 0; i < bandVals.length; ++i) { |
| 38 | bandVals[i] = new LinearEnvelope(0, 0, 500).trigger(); |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | final float logTen = log(10); |
| 43 | public float log10(float val) { |
| 44 | return log(val) / logTen; |
| 45 | } |
| 46 | |
| 47 | public float getLevel(int band) { |
| 48 | return bandVals[band].getValuef(); |
| 49 | } |
| 50 | |
| 51 | public float getAverageLevel(int minBand, int numBands) { |
| 52 | float avg = 0; |
| 53 | for (int i = minBand; i < minBand + numBands; ++i) { |
| 54 | avg += bandVals[i].getValuef(); |
| 55 | } |
| 56 | avg /= numBands; |
| 57 | return avg; |
| 58 | } |
| 59 | |
| 60 | public void run(int deltaMs) { |
| 61 | fft.forward(lx.audioInput().mix); |
| 62 | float zeroDBReference = pow(10, 100*(1-level.getValuef())/20.); |
| 63 | float decibelRange = 12 + range.getValuef() * 60; |
| 64 | float decibelSlope = slope.getValuef() * 60.f / numBands; |
| 65 | for (int i = 0; i < numBands; ++i) { |
| 66 | float raw = fft.getAvg(i); |
| 67 | float decibels = 20*log10(raw / zeroDBReference); |
| 68 | float positiveDecibels = decibels + decibelRange; |
| 69 | positiveDecibels += i*decibelSlope; |
| 70 | float value = constrain(positiveDecibels / decibelRange, 0, 1); |
| 71 | |
| 72 | if (value > bandVals[i].getValuef()) { |
| 73 | bandVals[i].setEndVal(value, attack.getValuef() * 20).trigger(); |
| 74 | } |
| 75 | } |
| 76 | for (LinearEnvelope band : bandVals) { |
| 77 | band.run(deltaMs); |
| 78 | if (!band.isRunning() && band.getValuef() > 0) { |
| 79 | band.setEndVal(0, release.getValuef() * 1600).trigger(); |
| 80 | } |
| 81 | } |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | |