crossbrowdy/CrossBrowdy/CrossBase/audiovisual/audio/timbre.js/extras/pico-binder.js

A Multimedia JavaScript framework to create real cross-platform and hybrid game engines, games, emulators, multimedia libraries and apps.

(function(T) {
    "use strict";

    var fn = T.fn;

    function PicoBinder(_args) {
        T.Object.call(this, 2, _args);
    }
    fn.extend(PicoBinder, T.Object);

    var $ = PicoBinder.prototype;

    Object.defineProperties($, {
        gen: {
            set: function(value) {
                if (typeof value === "object" && value.process) {
                    this._.gen = value;
                }
            },
            get: function() {
                return this._.gen;
            }
        }
    });

    $.process = function(tickID) {
        var _ = this._;
        if (this.tickID !== tickID) {
            this.tickID = tickID;
            if (_.gen) {
                this._.gen.process(this.cells[1], this.cells[2]);
                fn.outputSignalAR(this);
            }
        }
        return this;
    };

    var DelayNode = (function() {
        function DelayNode(opts) {
            var bits = Math.ceil(Math.log(T.samplerate * 1.5) * Math.LOG2E);

            this.cell = new T.fn.SignalArray(T.cellsize);

            this.time = 125;
            this.feedback  = 0.25;

            this.buffer = new T.fn.SignalArray(1 << bits);
            this.mask   = (1 << bits) - 1;
            this.wet    = 0.45;

            this.readIndex  = 0;
            this.writeIndex = (this.time / 1000 * T.samplerate)|0;

            if (opts) {
                this.setParams(opts);
            }
        }

        var $ = DelayNode.prototype;

        $.setParams = function(opts) {
            if (opts.time) {
                this.time = opts.time;
                this.writeIndex = this.readIndex + ((this.time * 0.001 * T.samplerate)|0);
            }
            if (opts.feedback) {
                this.feedback = opts.feedback;
            }
            if (opts.wet) {
                this.wet = opts.wet;
            }
            return this;
        };

        $.process = function(_cell, overwrite) {
            var cell;
            var buffer, writeIndex, readIndex, feedback;
            var value, wet, dry;
            var i, imax;

            cell   = this.cell;
            buffer = this.buffer;
            writeIndex = this.writeIndex;
            readIndex  = this.readIndex;
            feedback   = this.feedback;
            wet = this.wet;
            dry = 1 - this.wet;

            for (i = 0, imax = cell.length; i < imax; ++i) {
                value = buffer[readIndex];
                buffer[writeIndex] = _cell[i] - (value * feedback);
                cell[i] = (_cell[i] * dry) + (value * wet);
                writeIndex += 1;
                readIndex  += 1;
            }

            if (overwrite) {
                for (i = 0; i < imax; ++i) {
                    _cell[i] = cell[i];
                }
            }

            this.writeIndex = writeIndex & this.mask;
            this.readIndex  = readIndex  & this.mask;

            return cell;
        };

        return DelayNode;
    })();

    var pico;
    if (T.envtype === "browser") {
        if (!window.pico) {
            window.pico = {};
        }
        pico = window.pico;
    } else if(T.envtype === "node") {
        if (!global.pico) {
            global.pico = {};
        }
        pico = global.pico;
    }

    if (pico) {
        Object.defineProperties(pico, {
            env: {
                get: function() {
                    return T.env;
                }
            },
            samplerate: {
                get: function() {
                    return T.samplerate;
                }
            },
            channels: {
                get: function() {
                    return T.channels;
                }
            },
            cellsize: {
                get: function() {
                    return T.cellsize;
                }
            },
            isPlaying: {
                get: function() {
                    return T.isPlaying;
                }
            },
            DelayNode: {
                value: DelayNode
            }
        });

        fn.register("pico.js", PicoBinder);
    }
})(timbre);