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predict.js
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predict.js
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import {
GestureRecognizer,
DrawingUtils,
PoseLandmarker
} from '@mediapipe/tasks-vision';
import * as Tone from 'tone';
import * as teoria from 'teoria';
import * as core from '@magenta/music/esm/core';
import { getNotes } from './theory';
const notes = ["C4", "D4", "E4", "F4", "G4", "A4", "B4"];
let lastVideoTime = -1;
const canvas = document.querySelector("#video-container canvas");
const humans = {};
Tone.start()
let prevLeftGesture = null;
let prevRightGesture = null;
let prevLeftPos = null;
let prevRightPos = null;
let prevLeftRot = 0;
let prevRightRot = 0;
let chordPlaying = null;
let chordReverb = new Tone.Freeverb().toDestination();
let chordFilter = new Tone.Filter(20000, "lowpass").connect(chordReverb);
let pitchShift = new Tone.PitchShift().connect(chordFilter);
let chordSynth = [0, 0, 0, 0, 0].map(() => new Tone.Synth().connect(pitchShift));
chordSynth.forEach(a => a.set({ volume: -1000 }));
console.log(chordSynth);
// recorders
const recorder = new Tone.Recorder();
const synth = new Tone.Synth().connect(recorder);
let recording;
let slideToggle = false;
document.getElementById("slideToggle").addEventListener("click", () => {
slideToggle = !slideToggle;
})
let soundOn = false;
document.getElementById("toggleActivation").addEventListener("click", () => {
soundOn = !soundOn;
chordSynth.map(a => a.triggerRelease());
chordPlaying = null;
});
let record = false;
document.getElementById("toggleRecord").addEventListener("click", () => {
record = !record;
if (record) {
recorder.start();
console.log("recording audio");
} else {
recorder.stop((buffer) => {
recording = new Blob([buffer], { type: "audio/webm" });
console.log("stopping recording audio");
});
}
})
document.getElementById("videoDownload").addEventListener("click", () => {
if (recording) {
console.log('downloading audio');
const anchor = document.createElement("a");
if (recording instanceof Blob) {
const dorl = URL.createObjectURL(recording);
anchor.download = "recording.webm";
anchor.href = dorl;
anchor.click();
} else {
console.error("Invalid recording format");
}
} else {
console.error("No recording available");
}
})
export async function predictWebcam(video, gestureRecognizer, ctx) {
let nowInMs = Date.now();
let handResults;
const scale = video.videoWidth / video.offsetWidth;
if (video.currentTime !== lastVideoTime) {
lastVideoTime = video.currentTime;
handResults = gestureRecognizer.recognizeForVideo(video, nowInMs);
}
if (handResults?.landmarks) {
ctx.save();
ctx.clearRect(0, 0, video.offsetWidth, video.offsetHeight);
const drawingUtils = new DrawingUtils(ctx);
canvas.width = video.offsetWidth;
canvas.height = video.offsetHeight;
let leftHand = null;
let rightHand = null;
for (let [index, landmarks] of handResults.landmarks.entries()) {
if (!handResults.handedness[index]?.[0]) continue;
if (handResults.handedness[index][0].categoryName === "Left") {
rightHand = {
x: landmarks[0].x,
y: landmarks[0].y,
z: landmarks[0].z,
rot: Math.atan2((landmarks[9].y - landmarks[0].y), (landmarks[9].x - landmarks[0].x)) * 180 / Math.PI,
gesture: handResults.gestures[index][0].categoryName
};
} else if (handResults.handedness[index][0].categoryName === "Right") {
leftHand = {
x: landmarks[0].x,
y: landmarks[0].y,
z: landmarks[0].z,
rot: Math.atan2(-(landmarks[9].y - landmarks[0].y), (landmarks[9].x - landmarks[0].x)) * 180 / Math.PI,
gesture: handResults.gestures[index][0].categoryName
};
}
drawingUtils.drawConnectors(
landmarks,
GestureRecognizer.HAND_CONNECTIONS,
{
color: "#FF0000",
lineWidth: 5
}
);
drawingUtils.drawLandmarks(landmarks, {
color: "#00FF00",
lineWidth: 2
});
}
if (leftHand) {
if (leftHand.gesture === "Open_Palm") {
if (soundOn) {
if (!chordPlaying) {
const now = Tone.now();
chordSynth.map(a => { a.triggerRelease(); a.set({ volume: -1000 }) });
const [root, freqs, adj] = getNotes(leftHand.x, leftHand.y);
for (let [i, freq] of freqs.entries()) {
chordSynth[i].set({ volume: -20 });
chordSynth[i].triggerAttack(freq, now);
}
chordPlaying = root;
prevLeftRot = leftHand.rot;
} else {
if (slideToggle) {
const [root, freqs, adj] = getNotes(leftHand.x, leftHand.y);
for (let [i, synth] of chordSynth.entries()) {
if (!freqs[i]) {
chordSynth[i].triggerRelease();
chordSynth[i].set({ volume: -1000 });
synth.oscillator.frequency.set(0);
} else if (synth.volume.value === -1000) {
const now = Tone.now();
chordSynth[i].set({ volume: -20 });
chordSynth[i].triggerAttack(freqs[i], now);
} else {
chordSynth[i].oscillator.frequency.rampTo(freqs[i], 0.1);
}
}
}
// pitchShift.pitch = teoria.interval(root, chordPlaying).semitones() + (adj);
}
}
} else if (prevLeftGesture !== "Closed_Fist") {
const now = Tone.now();
chordSynth.map(a => { a.triggerRelease(); a.set({ volume: -1000 }) });
chordPlaying = null;
}
// if (slideToggle) {
// const normal = Math.min(1, Math.max(-1, (leftHand.rot - prevLeftRot) / 60));
// console.log(leftHand.rot);
// if (Math.abs(normal) >= 0.05) {
// pitchShift.pitch = ((normal) * 2);
// }
// }
prevLeftGesture = leftHand.gesture;
}
ctx.restore();
}
window.requestAnimationFrame(() => predictWebcam(video, gestureRecognizer, ctx));
}