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audio-eq: flatten frequency response

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ed
2021-06-15 21:06:00 +02:00
parent cd52dea488
commit cf2d6650ac
4 changed files with 199 additions and 19 deletions
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60
copyparty/web/browser.js
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@@ -512,26 +512,35 @@ var audio_eq = (function () {
var r = {
"en": false,
"bands": [31.25, 62.5, 125, 250, 500, 1000, 2000, 4000, 8000, 16000],
"gains": [0, -1, -2, -3, -4, -4, -3, -2, -1, 0],
"gains": [4, 3, 2, 1, 0, 0, 1, 2, 3, 4],
"filters": [],
"last_au": null
};
var cfg = [ // hz, q, g
[31.25 * 0.88, 0, 1.4], // shelf
[31.25 * 1.04, 0.7, 0.96], // peak
[62.5, 0.7, 1],
[125, 0.8, 1],
[250, 0.9, 1.03],
[500, 0.9, 1.1],
[1000, 0.9, 1.1],
[2000, 0.9, 1.105],
[4000, 0.88, 1.05],
[8000 * 1.006, 0.73, 1.24],
[16000 * 0.89, 0.7, 1.26], // peak
[16000 * 1.13, 0.82, 1.09], // peak
[16000 * 1.205, 0, 1.9] // shelf
];
try {
r.gains = jread('au_eq_gain', r.gains);
var gains = jread('au_eq_gain', r.gains);
if (r.gains.length == gains.length)
r.gains = gains;
}
catch (ex) { }
r.draw = function () {
var max = 0;
for (var a = 0; a < r.gains.length; a++)
if (max < r.gains[a])
max = r.gains[a];
if (max > 0)
for (var a = 0; a < r.gains.length; a++)
r.gains[a] -= max;
jwrite('au_eq_gain', r.gains);
var txt = QSA('input.eq_gain');
@@ -568,21 +577,36 @@ var audio_eq = (function () {
mp.acs = mp.ac.createMediaElementSource(mp.au);
}
r.filters = [];
if (!r.en) {
mp.acs.connect(mp.ac.destination);
return;
}
r.filters = [];
for (var a = 0; a < r.bands.length; a++) {
var max = 0;
for (var a = 0; a < r.gains.length; a++)
if (max < r.gains[a])
max = r.gains[a];
var gains = []
for (var a = 0; a < r.gains.length; a++)
gains.push(r.gains[a] - max);
var t = gains[gains.length - 1];
gains.push(t);
gains.push(t);
gains.unshift(gains[0]);
for (var a = 0; a < cfg.length; a++) {
var fi = mp.ac.createBiquadFilter();
fi.frequency.value = r.bands[a];
fi.gain.value = r.gains[a];
fi.Q.value = a == 0 ? 0 : 1;
fi.type = a == 0 ? 'lowshelf' : a == r.bands.length - 1 ? 'highshelf' : 'peaking';
fi.frequency.value = cfg[a][0];
fi.gain.value = cfg[a][2] * gains[a];
fi.Q.value = cfg[a][1];
fi.type = a == 0 ? 'lowshelf' : a == cfg.length - 1 ? 'highshelf' : 'peaking';
r.filters.push(fi);
}
for (var a = r.bands.length - 1; a >= 0; a--) {
for (var a = r.filters.length - 1; a >= 0; a--) {
r.filters[a].connect(a > 0 ? r.filters[a - 1] : mp.ac.destination);
}
mp.acs.connect(r.filters[r.filters.length - 1]);

61
copyparty/web/dbg-audio.js Normal file
View File

@@ -0,0 +1,61 @@
var ofun = audio_eq.apply.bind(audio_eq);
audio_eq.apply = function () {
var ac1 = mp.ac;
ofun();
var ac = mp.ac,
w = 2048,
h = 256;
if (!audio_eq.filters.length) {
audio_eq.ana = null;
return;
}
var can = ebi('fft_can');
if (!can) {
can = mknod('canvas');
can.setAttribute('id', 'fft_can');
can.style.cssText = 'position:absolute;left:0;bottom:5em;width:' + w + 'px;height:' + h + 'px;z-index:9001';
document.body.appendChild(can);
can.width = w;
can.height = h;
}
var cc = can.getContext('2d');
if (!ac)
return;
var ana = ac.createAnalyser();
ana.smoothingTimeConstant = 0;
ana.fftSize = 8192;
audio_eq.filters[0].connect(ana);
audio_eq.ana = ana;
var buf = new Uint8Array(ana.frequencyBinCount),
colw = can.width / buf.length;
cc.fillStyle = '#fc0';
function draw() {
if (ana == audio_eq.ana)
requestAnimationFrame(draw);
ana.getByteFrequencyData(buf);
cc.clearRect(0, 0, can.width, can.height);
/*var x = 0, w = 1;
for (var a = 0; a < buf.length; a++) {
cc.fillRect(x, h - buf[a], w, h);
x += w;
}*/
var mul = Math.pow(w, 4) / buf.length;
for (var x = 0; x < w; x++) {
var a = Math.floor(Math.pow(x, 4) / mul),
v = buf[a];
cc.fillRect(x, h - v, 1, v);
}
}
draw();
};
audio_eq.apply();