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mp3 test

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minjaesong
2023-01-13 22:56:59 +09:00
parent ac684fed71
commit 1c9e99bb66
12 changed files with 2627 additions and 0 deletions
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assets/disk0/tvdos/include/js-mp3/imdct.js Normal file
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var imdctWinData = [new Float32Array(36), new Float32Array(36), new Float32Array(36), new Float32Array(36)];
var cosN12 = [];
for (var i = 0; i < 6; i++) {
cosN12.push(new Float32Array(12));
}
var cosN36 = [];
for (var i = 0; i < 18; i++) {
cosN36.push(new Float32Array(36));
}
var init = function () {
for (var i = 0; i < 36; i++) {
imdctWinData[0][i] = Math.sin(Math.PI / 36 * (i + 0.5));
}
for (var i = 0; i < 18; i++) {
imdctWinData[1][i] = Math.sin(Math.PI / 36 * (i + 0.5));
}
for (var i = 18; i < 24; i++) {
imdctWinData[1][i] = 1.0;
}
for (var i = 24; i < 30; i++) {
imdctWinData[1][i] = Math.sin(Math.PI / 12 * (i + 0.5 - 18.0));
}
for (var i = 30; i < 36; i++) {
imdctWinData[1][i] = 0.0;
}
for (var i = 0; i < 12; i++) {
imdctWinData[2][i] = Math.sin(Math.PI / 12 * (i + 0.5));
}
for (var i = 12; i < 36; i++) {
imdctWinData[2][i] = 0.0;
}
for (var i = 0; i < 6; i++) {
imdctWinData[3][i] = 0.0;
}
for (var i = 6; i < 12; i++) {
imdctWinData[3][i] = Math.sin(Math.PI / 12 * (i + 0.5 - 6.0));
}
for (var i = 12; i < 18; i++) {
imdctWinData[3][i] = 1.0;
}
for (var i = 18; i < 36; i++) {
imdctWinData[3][i] = Math.sin(Math.PI / 36 * (i + 0.5));
}
const cosN12_N = 12
for (var i = 0; i < 6; i++) {
for (var j = 0; j < 12; j++) {
cosN12[i][j] = Math.cos(Math.PI / (2 * cosN12_N) * (2*j + 1 + cosN12_N/2) * (2*i + 1));
}
}
const cosN36_N = 36;
for (var i = 0; i < 18; i++) {
for (var j = 0; j < 36; j++) {
cosN36[i][j] = Math.cos(Math.PI / (2 * cosN36_N) * (2*j + 1 + cosN36_N/2) * (2*i + 1));
}
}
};
init();
var Imdct = {
Win: function (inData, blockType) {
var out = new Float32Array(36);
if (blockType === 2) {
var iwd = imdctWinData[blockType];
const N = 12;
for (var i = 0; i < 3; i++) {
for (var p = 0; p < N; p++) {
var sum = 0.0;
for (var m = 0; m < N/2; m++) {
sum += inData[i+3*m] * cosN12[m][p];
}
out[6*i+p+6] += sum * iwd[p];
}
}
return out;
}
const N = 36;
var iwd = imdctWinData[blockType];
for (var p = 0; p < N; p++) {
var sum = 0.0;
for (var m = 0; m < N/2; m++) {
sum += inData[m] * cosN36[m][p];
}
out[p] = sum * iwd[p];
}
return out;
}
};
exports = Imdct;