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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,4 +1,5 @@ | ||
| /node_modules/ | ||
| /disabled_sf2s/ | ||
| /config.json | ||
| /.idea | ||
| /.idea | ||
| /src/spessasynth_lib/synthetizer/freeverb_unused/ |
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src/spessasynth_lib/synthetizer/freeverb_unused/comb_filter.js
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| export class CombFilter | ||
| { | ||
| /** | ||
| * Feedback lowpass comb filter | ||
| * @param context {BaseAudioContext} | ||
| * @param delayTime {number} | ||
| */ | ||
| constructor(context, delayTime) { | ||
| //const context = inputNode.context; | ||
| this.delayLine = new DelayNode(context, { | ||
| delayTime: delayTime | ||
| }); | ||
| this.lowPassFilter = new BiquadFilterNode(context, { | ||
| type: "lowpass", | ||
| frequency: 440 | ||
| }); | ||
| this.reasonanceGain = new GainNode(context, { | ||
| gain: 0.5 | ||
| }); | ||
|
|
||
| /* +---------------+ | ||
| |reasonance gain| | ||
| +---------------+ | ||
| | /|\ | ||
| \|/ | | ||
| +-----+ +---------+ +-------+ +------+ | ||
| |input|-->|delayLine|-->|lowpass|-->|output| | ||
| +-----+ +---------+ +-------+ +------+ | ||
| | /|\ | ||
| +------------------------------------+ | ||
| */ | ||
| this.delayLine.connect(this.lowPassFilter); | ||
| this.lowPassFilter.connect(this.reasonanceGain); | ||
| this.reasonanceGain.connect(this.delayLine); | ||
| } | ||
|
|
||
| get input() | ||
| { | ||
| return this.delayLine; | ||
| } | ||
|
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| get output() | ||
| { | ||
| return this.delayLine//this.lowPassFilter; | ||
| } | ||
|
|
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| /** | ||
| * @param value {number} | ||
| */ | ||
| set dampening(value) | ||
| { | ||
| this.lowPassFilter.frequency.value = value; | ||
| } | ||
|
|
||
| /** | ||
| * @param value {number} | ||
| */ | ||
| set delayTime(value) | ||
| { | ||
| this.delayLine.delayTime.value = value; | ||
| } | ||
|
|
||
| /** | ||
| * @param value {number} | ||
| */ | ||
| set reasonance(value) | ||
| { | ||
| this.reasonanceGain.gain.value = value; | ||
| } | ||
| } |
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src/spessasynth_lib/synthetizer/freeverb_unused/freeverb.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| // Based on Freeverb, a public domain reverb implementation by Jezar at Dreampoint | ||
|
|
||
| import { CombFilter } from './comb_filter.js' | ||
|
|
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| const COMB_FILTER_TUNINGS_LEFT = [1557, 1617, 1491, 1422]; | ||
| const COMB_FILTER_TUNINGS_RIGHT = [1277, 1356, 1188, 1116]; | ||
| const ALLPASS_FREQS = [225, 556, 441, 341]; | ||
|
|
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| const ROOM_SIZE_DEFAULT = 0.5; | ||
| const DAMPERING_DEFAULT = 3000; | ||
| export class Freeverb | ||
| { | ||
| /** | ||
| * Creates a new Freeverb instance | ||
| * @param context {BaseAudioContext} | ||
| * @param defaultLevel {number} 0-127 | ||
| */ | ||
| constructor(context, defaultLevel) { | ||
| /* | ||
| * +-------------+ | ||
| * +->|comb filter 1|------+ | ||
| * | +-------------+ | | ||
| * left | \|/ | ||
| * +--------+ 6 more +------+ +---------+ +---------+ +---------+ +---------+ +------+ | ||
| * |input|->|splitter| filters here |merger|-> |allpass 1|->|allpass 2|->|allpass 3|->|allpass 4|->|output| | ||
| * +--------+ +------+ +---------+ +---------+ +---------+ +---------+ +------+ | ||
| * right | /|\ | ||
| * | +-------------+ | | ||
| * +->|comb filter 8|------+ | ||
| * +-------------+ | ||
| * | ||
| * | ||
| * i think thats how it works | ||
| * | ||
| */ | ||
| // merger and splitter | ||
| this.splitter = new ChannelSplitterNode(context, { | ||
| numberOfOutputs: 2 | ||
| }); | ||
| this.merger = new ChannelMergerNode(context, { | ||
| numberOfInputs: 2 | ||
| }); | ||
| // reverb level controllers | ||
| this.wetGain = new GainNode(context, { | ||
| gain: defaultLevel / 127 | ||
| }); | ||
| this.dryGain = new GainNode(context, { | ||
| gain: (127 - defaultLevel) / 127 | ||
| }); | ||
|
|
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| this.wetGain.connect(this.splitter); | ||
|
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| // comb filters left | ||
| this.combFiltersLeft = COMB_FILTER_TUNINGS_LEFT.map(tuning => { | ||
| const comb = new CombFilter(context, tuning / context.sampleRate); | ||
| comb.reasonance = ROOM_SIZE_DEFAULT; | ||
| comb.dampening = DAMPERING_DEFAULT; | ||
|
|
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| this.splitter.connect(comb.input, 0); | ||
| comb.output.connect(this.merger, 0, 0); | ||
| return comb; | ||
| }); | ||
|
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| // comb filters right | ||
| this.combFiltersRight = COMB_FILTER_TUNINGS_RIGHT.map(tuning => { | ||
| const comb = new CombFilter(context, tuning / context.sampleRate); | ||
| comb.reasonance = ROOM_SIZE_DEFAULT; | ||
| comb.dampening = DAMPERING_DEFAULT; | ||
|
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| this.splitter.connect(comb.input, 1); | ||
| comb.output.connect(this.merger, 0, 1); | ||
| return comb; | ||
| }); | ||
| this.splitter.connect(this.merger, 1, 1); | ||
| this.splitter.connect(this.merger, 0, 0); | ||
|
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| /** | ||
| * allpass filters | ||
| * @type {BiquadFilterNode[]} | ||
| */ | ||
| this.allpassFilters = []; | ||
| ALLPASS_FREQS.forEach((frequency, index) => { | ||
| const allpass = new BiquadFilterNode(context, { | ||
| type: 'allpass', | ||
| frequency: frequency | ||
| }); | ||
|
|
||
| if(this.allpassFilters[index - 1]) | ||
| { | ||
| this.allpassFilters[index - 1].connect(allpass); | ||
| } | ||
| this.allpassFilters.push(allpass); | ||
| }); | ||
|
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| this.merger.connect(this.allpassFilters[0]); | ||
| } | ||
|
|
||
| /** | ||
| * @returns {{connect: function(AudioNode)}} | ||
| */ | ||
| get input() | ||
| { | ||
| return { | ||
| connect: node => { | ||
| node.connect(this.dryGain); | ||
| node.connect(this.wetGain); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * @param output {AudioNode} | ||
| */ | ||
| connectOutput(output) | ||
| { | ||
| this.dryGain.connect(output); | ||
| this.allpassFilters[this.allpassFilters.length - 1].connect(output); | ||
| } | ||
|
|
||
| /** | ||
| * @param level {number} 0-127 | ||
| */ | ||
| setLevel(level) | ||
| { | ||
| this.wetGain.gain.value = level / 127; | ||
| this.dryGain.gain.value = (127 - level) / 127; | ||
| } | ||
| } |
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