radio/libjs/wController/file/audio.js

"use strict";

var File = require("./file");
var Vocabulary = require("../../wType/vocabulary");
var Vector = require("../../wType/vector");
var Uint64 = require("../../wType/uint64");

var Audio = File.inherit({
    className: "Audio",
    constructor: function Audio(addr) {
        File.fn.constructor.call(this, addr);
        
        this._loadedFrames = 0;
        this._totalFrames = 0;
        this._waitingForFrames = false;
        this._frames = new Vector();
        
        this.addHandler("responseFrames");
    },
    destructor: function() {
        this._frames.destructor();
        
        File.fn.destructor.call(this);
    },
    hasMore: function() {
        return this._totalFrames > this._loadedFrames;
    },
    _getAdditional: function(add) {
        var ac = File.fn._getAdditional.call(this, add);
        
        if (ac) {
            this._loadedFrames = 0;
            this._totalFrames = this._additional.at("framesAmount").valueOf();
            this._waitingForFrames = false;
        }
        
        this.initialized = true;
        return ac;
    },
    _h_responseFrames: function(ev) {
        if (this._waitingForFrames === true) {
            var data = ev.getData();
            
            var success = data.at("result").valueOf();
            if (success === 0) {
                var frames = data.at("frames");
                var amount = frames.length();
                var buffer = new ArrayBuffer(0);
                
                for (var i = 0; i < amount; ++i) {
                    var blob = frames.at(i).clone();
                    this._frames.push(blob);
                    var frame = blob.valueOf();
                    
                    var newArr = new Uint8Array(buffer.byteLength + frame.byteLength);
                    newArr.set(new Uint8Array(buffer), 0);
                    newArr.set(new Uint8Array(frame), buffer.byteLength);
                    buffer = newArr.buffer;
                }
                
                
                this._loadedFrames += amount;
                this._waitingForFrames = false;
                this.trigger("newFrames", buffer);
            }
        }
    },
    requestMore: function() {
        if (!this._waitingForFrames) {
            if (this._registered && this._subscribed) {
                var allowed = this._totalFrames - this._loadedFrames;
                
                if (allowed > 0) {
                    var vc = new Vocabulary();
                    vc.insert("index", new Uint64(this._loadedFrames));
                    vc.insert("amount", new Uint64(Math.min(framePortion, allowed)));
                    
                    this.send(vc, "requestFrames");
                    this._waitingForFrames = true;
                }
            }
        }
    }
});

var framePortion = 10;

module.exports = Audio;