Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 | 89x 89x 89x 89x 89x 89x 89x 89x 89x 89x 89x 116x 32x 32x 32x 32x 32x 40x 40x 39x 39x 39x 10x 9x 10x 29x 29x 29x 29x 29x 29x 23x 6x 6x 6x 6x 6x 6x 6x 6x 29x 50x 50x 50x 50x 50x 50x 11x 11x 10x 10x 10x 9x 9x 15x 13x 8x 9x 9x 39x 5x 5x 5x 5x 7x 4x 2x 1x | import { SamplePlayer } from "./sample-player.js";
const Idle = 0;
const SpinUp = 1;
const Spinning = 2;
const Volume = 0.25;
/**
* Each seekNNin/seekNNout.wav is a real 40-track drive taking 35 steps at NN ms a step, inward
* (to higher tracks) or outward, recorded with a Greaseweazle stepping it. Step k's click
* follows its cut point, RunLeadSeconds + k * NN ms, in the quiet before it (at 6 ms the steps
* run together and there is none), and the head's settle follows the last. A lone step is
* stepin/stepout.wav, the same drive taking one step from rest, a little louder than its share
* of a run so that it carries on its own.
*/
const RunRatesMs = [6, 12, 20, 24, 30];
const RunSteps = 35;
const RunLeadSeconds = 0.005;
/**
* A run's first few steps start it from rest, so only the opening of a seek longer than a run
* plays them; the steps it repeats to fill out the rest come from this one on.
*/
const RunFillFirstStep = 5;
/** Pieces of a run cross-fade over this long, ending at a step's cut point. */
const JoinFadeSeconds = 0.002;
const runName = (rateMs, inward) => `seek${String(rateMs).padStart(2, "0")}${inward ? "in" : "out"}`;
/** The recorded rate nearest the controller's; near enough beats a run of mismatched clicks. */
const nearestRunRate = (stepMs) =>
RunRatesMs.reduce((best, rate) => (Math.abs(rate - stepMs) < Math.abs(best - stepMs) ? rate : best));
export class DdNoise extends SamplePlayer {
constructor(context, destination) {
super(context, destination, Volume);
this.state = Idle;
this.motor = null;
this.run = null;
this.clickEnds = 0;
}
async initialise() {
const runs = {};
for (const rate of RunRatesMs) {
for (const inward of [true, false]) {
const name = runName(rate, inward);
runs[name] = `sounds/disc525/${name}.wav`;
}
}
await this.loadSounds({
motorOn: "sounds/disc525/motoron.wav",
motorOff: "sounds/disc525/motoroff.wav",
motor: "sounds/disc525/motor.wav",
stepIn: "sounds/disc525/stepin.wav",
stepOut: "sounds/disc525/stepout.wav",
...runs,
});
}
spinUp() {
if (this.state === Spinning || this.state === SpinUp) return;
this.state = SpinUp;
this.play(this.sounds.motorOn).then(
() => {
// Handle race: we may have had spinDown() called on us before the
// spinUp() initial sound finished playing.
if (this.state === Idle) return;
this.play(this.sounds.motor, true).then((source) => {
this.motor = source;
this.state = Spinning;
});
},
() => {},
);
}
spinDown() {
if (this.state === Idle) return;
this.state = Idle;
if (this.motor) {
this.motor.stop();
this.motor = null;
this.oneShot(this.sounds.motorOff);
}
}
/**
* The head is about to take `steps` steps (positive inward), one every `stepMs`: the last
* that many steps of the recorded run nearest that rate, through to its settle. A seek
* longer than the recording starts with its opening steps, repeats steps from past them as
* many times as it takes, and ends with its last steps and settle.
* A single step is a lone step, held off while the last one still sounds.
*/
seekStart(steps, stepMs) {
const count = Math.abs(steps);
if (count === 0) return;
this.cancelRun();
const now = this.context.currentTime;
if (count === 1) {
if (now >= this.clickEnds)
this.clickEnds = now + this.oneShot(steps > 0 ? this.sounds.stepIn : this.sounds.stepOut);
return;
}
const rateMs = nearestRunRate(stepMs);
const stepSeconds = rateMs / 1000;
const sound = this.sounds[runName(rateMs, steps > 0)];
const start = now + JoinFadeSeconds;
const parts = [];
if (count <= RunSteps) {
parts.push(this.playSteps(sound, start, RunSteps - count, null, stepSeconds));
} else {
const fill = RunSteps - RunFillFirstStep;
let done = Math.min(RunSteps, count - fill);
parts.push(this.playSteps(sound, start, 0, done, stepSeconds));
while (count - done > fill) {
const take = Math.min(fill, count - done - fill);
parts.push(this.playSteps(sound, start + done * stepSeconds, RunFillFirstStep, take, stepSeconds));
done += take;
}
parts.push(this.playSteps(sound, start + done * stepSeconds, RunFillFirstStep, null, stepSeconds));
}
this.run = { sound, parts, start, stepSeconds, steps: count };
}
/**
* Plays `take` of the recording's steps from step `first`, its cut point landing at
* `cutAt`; a null `take` plays everything from `first` on, settle and all.
*/
playSteps(sound, cutAt, first, take, stepSeconds) {
const offset = RunLeadSeconds + first * stepSeconds - JoinFadeSeconds;
const duration = take === null ? sound.duration - offset : take * stepSeconds + JoinFadeSeconds;
const stepping = take === null ? RunSteps - first : take;
const at = cutAt - JoinFadeSeconds;
const source = this.startSound(sound, { when: at, offset, duration, fadeSeconds: JoinFadeSeconds });
return { source, at, cutAt, stepsEnd: cutAt + stepping * stepSeconds };
}
/**
* The head has stopped after `steps` steps. Fewer than announced fades the run out where
* the next step would have sounded, or from now if that has passed, and lets the recording's
* settle ring from there. Told once every step has sounded, it leaves the run's own settle
* ringing. The run stays until a new movement, so that a settle still to come can give way.
*/
seekEnd(steps) {
const run = this.run;
if (!run || steps >= run.steps) return;
const now = this.context.currentTime;
run.steps = steps;
if (now >= run.parts.at(-1).stepsEnd) return;
const stopAt = run.start + steps * run.stepSeconds;
for (const { source, at, cutAt, stepsEnd } of run.parts) {
if (!source || (cutAt < stopAt && stepsEnd <= stopAt)) continue;
if (cutAt >= stopAt && now < at + JoinFadeSeconds) source.stop();
else this.stopSound(source, stopAt, JoinFadeSeconds);
}
const settleAt = Math.max(stopAt, now + JoinFadeSeconds);
run.parts.push(this.playSteps(run.sound, settleAt, RunSteps, null, run.stepSeconds));
}
/**
* Stops the parts of a run with steps still to sound, fading out any already sounding; a
* part still fading in has not been heard, and stops outright, since fading it out from there
* would first jump it to full level. A settle already ringing rings on.
*/
cancelRun() {
if (!this.run) return;
const { parts } = this.run;
this.run = null;
const now = this.context.currentTime;
for (const { source, at, stepsEnd } of parts) {
if (!source || now >= stepsEnd) continue;
if (now < at + JoinFadeSeconds) source.stop();
else this.stopSound(source, now + JoinFadeSeconds, JoinFadeSeconds);
}
}
}
export class FakeDdNoise {
seekStart() {}
seekEnd() {}
initialise() {
return Promise.resolve();
}
spinUp() {}
spinDown() {}
mute() {}
unmute() {}
}
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