1 | import { FADEIN, FADEOUT, createFadeIn, createFadeOut } from "fade-maker";
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2 | export default class {
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3 | constructor(ac, buffer) {
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4 | this.ac = ac;
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5 | this.gain = 1;
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6 | this.buffer = buffer;
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7 | this.destination = this.ac.destination;
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8 | this.ac.createStereoPanner = ac.createStereoPanner || ac.createPanner;
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9 | }
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10 |
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11 | applyFade(type, start, duration, shape = "logarithmic") {
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12 | if (type === FADEIN) {
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13 | createFadeIn(this.fadeGain.gain, shape, start, duration);
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14 | } else if (type === FADEOUT) {
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15 | createFadeOut(this.fadeGain.gain, shape, start, duration);
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16 | } else {
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17 | throw new Error("Unsupported fade type");
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18 | }
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19 | }
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20 |
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21 | applyFadeIn(start, duration, shape = "logarithmic") {
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22 | this.applyFade(FADEIN, start, duration, shape);
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23 | }
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24 |
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25 | applyFadeOut(start, duration, shape = "logarithmic") {
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26 | this.applyFade(FADEOUT, start, duration, shape);
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27 | }
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28 |
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29 | isPlaying() {
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30 | return this.source !== undefined;
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31 | }
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32 |
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33 | getDuration() {
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34 | return this.buffer.duration;
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35 | }
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36 |
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37 | setAudioContext(ac) {
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38 | this.ac = ac;
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39 | this.ac.createStereoPanner = ac.createStereoPanner || ac.createPanner;
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40 | this.destination = this.ac.destination;
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41 | }
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42 |
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43 | setUpSource() {
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44 | this.source = this.ac.createBufferSource();
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45 | this.source.buffer = this.buffer;
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46 | const sourcePromise = new Promise(resolve => {
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47 |
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48 | this.source.onended = () => {
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49 | this.source.disconnect();
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50 | this.fadeGain.disconnect();
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51 | this.volumeGain.disconnect();
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52 | this.shouldPlayGain.disconnect();
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53 | this.panner.disconnect();
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54 | this.masterGain.disconnect();
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55 | this.source = undefined;
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56 | this.fadeGain = undefined;
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57 | this.volumeGain = undefined;
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58 | this.shouldPlayGain = undefined;
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59 | this.panner = undefined;
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60 | this.masterGain = undefined;
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61 | resolve();
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62 | };
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63 | });
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64 | this.fadeGain = this.ac.createGain();
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65 |
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66 | this.volumeGain = this.ac.createGain();
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67 |
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68 | this.shouldPlayGain = this.ac.createGain();
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69 | this.masterGain = this.ac.createGain();
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70 | this.panner = this.ac.createStereoPanner();
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71 | this.source.connect(this.fadeGain);
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72 | this.fadeGain.connect(this.volumeGain);
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73 | this.volumeGain.connect(this.shouldPlayGain);
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74 | this.shouldPlayGain.connect(this.masterGain);
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75 | this.masterGain.connect(this.panner);
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76 | this.panner.connect(this.destination);
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77 | return sourcePromise;
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78 | }
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79 |
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80 | setVolumeGainLevel(level) {
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81 | if (this.volumeGain) {
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82 | this.volumeGain.gain.value = level;
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83 | }
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84 | }
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85 |
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86 | setShouldPlay(bool) {
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87 | if (this.shouldPlayGain) {
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88 | this.shouldPlayGain.gain.value = bool ? 1 : 0;
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89 | }
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90 | }
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91 |
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92 | setMasterGainLevel(level) {
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93 | if (this.masterGain) {
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94 | this.masterGain.gain.value = level;
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95 | }
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96 | }
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97 |
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98 | setStereoPanValue(value) {
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99 | const pan = value === undefined ? 0 : value;
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100 |
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101 | if (this.panner) {
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102 | if (this.panner.pan !== undefined) {
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103 | this.panner.pan.value = pan;
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104 | } else {
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105 | this.panner.panningModel = "equalpower";
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106 | this.panner.setPosition(pan, 0, 1 - Math.abs(pan));
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107 | }
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108 | }
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109 | }
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110 | |
111 |
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112 |
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113 |
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114 |
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115 |
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116 |
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117 |
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118 | play(when, start, duration) {
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119 | this.source.start(when, start, duration);
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120 | }
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121 |
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122 | stop(when = 0) {
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123 | if (this.source) {
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124 | this.source.stop(when);
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125 | }
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126 | }
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127 |
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128 | } |
\ | No newline at end of file |