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New fns calculating domain and inverse.
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This is to allow for inputting values in the correct domain such as 440Hz and have them translated back into UI slider values.
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@chr15m
chr15m committed Dec 12, 2022
1 parent ca47b7b commit a05a32f
Showing 1 changed file with 123 additions and 3 deletions.
126 changes: 123 additions & 3 deletions sfxr.js
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Original file line number Diff line number Diff line change
Expand Up @@ -876,14 +876,16 @@ var _sfxr_getAudioFn = function(wave) {
};
};

/*** conversions from slider value and to units ***/
/*** conversions from slider values, internal, and units ***/

// convert from slider values to internal representation

var sliders = {
p_env_attack: function (v) { return v * v * 100000.0 },
p_env_sustain: function (v) { return v * v * 100000.0 },
p_env_punch: function (v) { return v },
p_env_decay: function (v) { return v * v * 100000.0 },

p_base_freq: function (v) { return 8 * 44100 * (v * v + 0.001) / 100 },
p_freq_limit: function (v) { return 8 * 44100 * (v * v + 0.001) / 100 },
p_freq_ramp: function (v) { return 1.0 - Math.pow(v, 3.0) * 0.01 },
Expand All @@ -895,7 +897,7 @@ var sliders = {
p_arp_mod: function (v) {
return v >= 0 ? 1.0 - Math.pow(v, 2) * 0.9 : 1.0 + Math.pow(v, 2) * 10; },
p_arp_speed: function (v) { return (v === 1.0) ? 0 :
Math.floor(Math.pow(1.0 - v, 2.0) * 20000 +32)},
Math.floor(Math.pow(1.0 - v, 2.0) * 20000 + 32)},

p_duty: function (v) { return 0.5 - v * 0.5; },
p_duty_ramp: function (v) { return -v * 0.00005 },
Expand All @@ -916,6 +918,117 @@ var sliders = {
sound_vol: function (v) { return Math.exp(v) - 1; }
};

var sliders_inverse = {
p_env_attack: function (v) { return Math.sqrt(v / 100000.0); },
p_env_sustain: function (v) { return Math.sqrt(v / 100000.0); },
p_env_punch: function (v) { return v; },
p_env_decay: function (v) { return Math.sqrt(v / 100000.0); },

p_base_freq: function (v) { return Math.sqrt(v * 100 / 8 / 44100 - 0.001); },
p_freq_limit: function (v) { return Math.sqrt(v * 100 / 8 / 44100 - 0.001); },
p_freq_ramp: function (v) { return Math.cbrt((1.0 - v) / 0.01); },
p_freq_dramp: function (v) { return Math.cbrt(v / -0.000001); },

p_vib_speed: function (v) { return Math.sqrt(v / 0.01); },
p_vib_strength: function (v) { return v / 0.5; },

p_arp_mod: function (v) {
return v < 1 ? Math.sqrt((1.0 - v) / 0.9) : -Math.sqrt((v - 1.0) / 10.0);
},
p_arp_speed: function (v) { return (v === 0) ? 1.0 :
( (1.0 - Math.sqrt((v - (v < 100 ? 30 : 32)) / 20000)))},

p_duty: function (v) { return (v - 0.5) / -0.5; },
p_duty_ramp: function (v) { return v / -0.00005 },

p_repeat_speed: function (v) { return v === 0 ? 0 : -(Math.sqrt((v - 32) / 20000) - 1.0) },

p_pha_offset: function (v) { return (v < 0 ? -1 : 1) * Math.sqrt(Math.abs(v) / 1020) },
p_pha_ramp: function (v) { return (v < 0 ? -1 : 1) * Math.sqrt(Math.abs(v)) },

p_lpf_freq: function (v) { return Math.cbrt(v / 0.1); },
p_lpf_ramp: function (v) { return (v - 1.0) / 0.0001; },
p_lpf_resonance: function (v) { return Math.sqrt((1.0 / (v / 5.0) - 1) / 20) },

p_hpf_freq: function (v) { return Math.sqrt(v / 0.1); },
p_hpf_ramp: function (v) { return (v - 1.0) / 0.0003; },
sound_vol: function (v) { return Math.log(v + 1);; }
}

// convert from internal representation to domain value without units

var domain = {
p_env_attack: function (v) { return (v / 44100); },
p_env_sustain: function (v) { return (v / 44100); },
p_env_punch: function (v) { return (v * 100); },
p_env_decay: function (v) { return (v / 44100); },

p_base_freq: function (v) { return v; },
p_freq_limit: function (v) { return v; },
p_freq_ramp: function (v) { return (44100*Math.log(v)/Math.log(0.5)); },
p_freq_dramp: function (v) { return (v*44100 / Math.pow(2, -44101./44100)); },

p_vib_speed: function (v) { return (441000/64. * v); },
p_vib_strength: function (v) { return (v*100); },

p_arp_mod: function (v) { return (1./v); },
p_arp_speed: function (v) { return (v / 44100); },

p_duty: function (v) { return (100 * v); },
p_duty_ramp: function (v) { return (8 * 44100 * v); },

p_repeat_speed: function (v) { return v === 0 ? 0 : (44100./v); },

p_pha_offset: function (v) { return (1000*v/44100); },
p_pha_ramp: function (v) { return (1000*v); },

p_lpf_freq: function (v) { return (v === .1) ? 0 : 8 * 44100 * v / (1-v); },
p_lpf_ramp: function (v) { return Math.pow(v, 44100); },
p_lpf_resonance: function (v) { return (100*(1-v*.11));},

p_hpf_freq: function (v) { return 8 * 44100 * v / (1-v); },
p_hpf_ramp: function (v) { return Math.pow(v, 44100); },

sound_vol: function (v) { return 10 * Math.log(v*v) / Math.log(10); }
}

var domain_inverse = {
p_env_attack: function (v) { return (v * 44100); },
p_env_sustain: function (v) { return (v * 44100); },
p_env_punch: function (v) { return (v / 100); },
p_env_decay: function (v) { return (v * 44100); },

p_base_freq: function (v) { return v; },
p_freq_limit: function (v) { return v; },
p_freq_ramp: function (v) { return Math.exp(Math.log(0.5) * v / 44100); },
p_freq_dramp: function (v) { return v * Math.pow(2, -44101./44100) / 44100; },

p_vib_speed: function (v) { return (64. / 441000) * v; },
p_vib_strength: function (v) { return (v / 100); },

p_arp_mod: function (v) { return (1. / v); },
p_arp_speed: function (v) { return (v * 44100); },

p_duty: function (v) { return (v / 100); },
p_duty_ramp: function (v) { return (v / (8 * 44100)); },

p_repeat_speed: function (v) { return v <= 0 ? 0 : v > 1378 ? 32 : (44100 / v); },

p_pha_offset: function (v) { return (v / 1000) * 44100; },
p_pha_ramp: function (v) { return (v / 1000); },

p_lpf_freq: function (v) { return (v / (v + 8 * 44100)); },
p_lpf_ramp: function (v) { return Math.pow(v, 1 / 44100); },
p_lpf_resonance: function (v) { return (1 - v / 100) / .11; },

p_hpf_freq: function (v) { return (v / (v + 8 * 44100)); },
p_hpf_ramp: function (v) { return Math.pow(v, 1 / 44100); },

sound_vol: function (v) { return Math.sqrt(Math.pow(10, v / 10)); }
}

// convert from internal representation to printable units

var units = {
p_env_attack: function (v) { return (v / 44100).toPrecision(4) + ' sec' },
p_env_sustain: function (v) { return (v / 44100).toPrecision(4) + ' sec' },
Expand Down Expand Up @@ -996,8 +1109,15 @@ var units = {
"sfxr": sfxr,
"convert": {
"sliders": sliders,
"domain": domain,
"sliders_inverse": sliders_inverse,
"domain_inverse": domain_inverse,
"units": units,
},
"parameters": {
"order": params_order,
"signed": params_signed,
},
"Params": Params,
"SoundEffect": SoundEffect,
"waveforms": {
Expand Down

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