layui_back/back/assets/EZUIKit/js/worker.js

(function () {
    'use strict';

    var samplesMono;

    var floatTo16BitPCM = function (input, output) {
        for (var i = 0; i < input.length; i++) {
            var s = Math.max(-1, Math.min(1, input[i]));
            output[i] = (s < 0 ? s * 0x8000 : s * 0x7FFF);
        }
    };

    var convertBuffer = function (arrayBuffer) {
        var data = new Float32Array(arrayBuffer);
        var out = new Int16Array(arrayBuffer.length);
        floatTo16BitPCM(data, out);
        return out;
    };

    var encode = function (arrayBuffer) {
        samplesMono = convertBuffer(arrayBuffer);
        self.postMessage({
            cmd: 'pcm',
            buf: samplesMono
        });
    };

    self.onmessage = function (e) {
        switch (e.data.cmd) {
            case 'encode':
                encode(e.data.buf);
                break;
        }
    };
})();