android-cloud-H5/static/js/aac.js

(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);throw new Error("Cannot find module '"+o+"'")}var f=n[o]={exports:{}};t[o][0].call(f.exports,function(e){var n=t[o][1][e];return s(n?n:e)},f,f.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
(function (global){
var AV = (typeof window !== "undefined" ? window['AV'] : typeof global !== "undefined" ? global['AV'] : null);
var tables = require('./tables');

var ADTSDemuxer = AV.Demuxer.extend(function() {
    AV.Demuxer.register(this);
    
    this.probe = function(stream) {
    
        var offset = stream.offset;
        console.log('尝试stream.available(2)',stream)
        // 尝试查找ADTS同步字
        while (stream.available(2)) {
        	console.log('尝试查找ADTS同步字>>>',stream.available(2))
            if ((stream.readUInt16() & 0xfff6) === 0xfff0) {
				 // console.log('stream.seek',stream.seek)
                stream.seek(offset);
                return true;
            }
        }
        
        stream.seek(offset);
        return false;
    };
        
    this.prototype.init = function() {
        this.bitstream = new AV.Bitstream(this.stream);
    };
    
    // 读广告头r读取标题
    // See http://wiki.multimedia.cx/index.php?title=ADTS
    this.readHeader = function(stream) {
        if (stream.read(12) !== 0xfff){
        	throw new Error('Invalid ADTS header.');
        }else{
        	
        	var ret = {};
        stream.advance(3); //mpeg版本和层
        var protectionAbsent = !!stream.read(1);
        
        ret.profile = stream.read(2) + 1;
        ret.samplingIndex = stream.read(4);
        
        stream.advance(1); // private
        ret.chanConfig = stream.read(3);
        stream.advance(4); // original/copy, home, copywrite, and copywrite start
        
        ret.frameLength = stream.read(13);
        stream.advance(11); // fullness
        
        ret.numFrames = stream.read(2) + 1;
        
        if (!protectionAbsent)
            stream.advance(16);

        return ret;
        }
        
        

    };
    //读取区块
    this.prototype.readChunk = function() {
    	
        if (!this.sentHeader) {
        	
            var offset = this.stream.offset;
            var header = ADTSDemuxer.readHeader(this.bitstream);
            console.log('format')
            this.emit('format', {
                formatID: 'aac ',
                sampleRate: tables.SAMPLE_RATES[header.samplingIndex],
                channelsPerFrame: header.chanConfig,
                bitsPerChannel: 16
            });
            
            // 从ADTS头生成一个神奇的cookie
            var cookie = new Uint8Array(2);
            cookie[0] = (header.profile << 3) | ((header.samplingIndex >> 1) & 7);
            cookie[1] = ((header.samplingIndex & 1) << 7) | (header.chanConfig << 3);
            this.emit('cookie', new AV.Buffer(cookie));
            
            this.stream.seek(offset); 
            this.sentHeader = true;//发送的标题
        }
        
        while (this.stream.available(1)) {
     	// console.log('buffer>>>',buffer)
            var buffer = this.stream.readSingleBuffer(this.stream.remainingBytes());
            this.emit('data', buffer);
        }
    };
});

module.exports = ADTSDemuxer;

}).call(this,typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./tables":11}],2:[function(require,module,exports){
/*
 * AAC.js - Advanced Audio Coding decoder in JavaScript
 * Created by Devon Govett
 * Copyright (c) 2012, Official.fm Labs
 *
 * AAC.js is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as 
 * published by the Free Software Foundation; either version 3 of the 
 * License, or (at your option) any later version.
 *
 * AAC.js is distributed in the hope that it will be useful, but WITHOUT 
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General 
 * Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.
 * If not, see <http://www.gnu.org/licenses/>.
 */

var ICStream = require('./ics');
var Huffman = require('./huffman');
    
// 通道耦合
function CCEElement(config) {
    this.ics = new ICStream(config);
    this.channelPair = new Array(8);
    this.idSelect = new Int32Array(8);
    this.chSelect = new Int32Array(8);
    this.gain = new Array(16);
}

CCEElement.BEFORE_TNS = 0;
CCEElement.AFTER_TNS = 1;
CCEElement.AFTER_IMDCT = 2;

var CCE_SCALE = new Float32Array([
    1.09050773266525765921,
    1.18920711500272106672,
    1.4142135623730950488016887,
    2.0
]);

CCEElement.prototype = {
    decode: function(stream, config) {
        var channelPair = this.channelPair,
            idSelect = this.idSelect,
            chSelect = this.chSelect;

        this.couplingPoint = 2 * stream.read(1);
        this.coupledCount = stream.read(3);

        var gainCount = 0;
        for (var i = 0; i <= this.coupledCount; i++) {
            gainCount++;
            channelPair[i] = stream.read(1);
            idSelect[i] = stream.read(4);

            if (channelPair[i]) {
                chSelect[i] = stream.read(2);
                if (chSelect[i] === 3)
                    gainCount++;

            } else {
                chSelect[i] = 2;
            }
        }

        this.couplingPoint += stream.read(1);
        this.couplingPoint |= (this.couplingPoint >>> 1);

        var sign = stream.read(1),
            scale = CCE_SCALE[stream.read(2)];

        this.ics.decode(stream, config, false);

        var groupCount = this.ics.info.groupCount,
            maxSFB = this.ics.info.maxSFB,
            bandTypes = this.ics.bandTypes;

        for (var i = 0; i < gainCount; i++) {
            var idx = 0,
                cge = 1,
                gain = 0,
                gainCache = 1;

            if (i > 0) {
                cge = this.couplingPoint === CCEElement.AFTER_IMDCT ? 1 : stream.read(1);
                gain = cge ? Huffman.decodeScaleFactor(stream) - 60 : 0;
                gainCache = Math.pow(scale, -gain);
            }

            var gain_i = this.gain[i] = new Float32Array(120);

            if (this.couplingPoint === CCEElement.AFTER_IMDCT) {
                gain_i[0] = gainCache;
            } else {
                for (var g = 0; g < groupCount; g++) {
                    for (var sfb = 0; sfb < maxSFB; sfb++) {
                        if (bandTypes[idx] !== ICStream.ZERO_BT) {
                            if (cge === 0) {
                                var t = Huffman.decodeScaleFactor(stream) - 60;
                                if (t !== 0) {
                                    var s = 1;
                                    t = gain += t;
                                    if (!sign) {
                                        s -= 2 * (t & 0x1);
                                        t >>>= 1;
                                    }
                                    gainCache = Math.pow(scale, -t) * s;
                                }
                            }
                            gain_i[idx++] = gainCache;
                        }
                    }
                }
            }
        }
    },

    applyIndependentCoupling: function(index, data) {
        var gain = this.gain[index][0],
            iqData = this.ics.data;

        for (var i = 0; i < data.length; i++) {
            data[i] += gain * iqData[i];
        }
    },

    applyDependentCoupling: function(index, data) {
        var info = this.ics.info,
            swbOffsets = info.swbOffsets,
            groupCount = info.groupCount,
            maxSFB = info.maxSFB,
            bandTypes = this.ics.bandTypes,
            iqData = this.ics.data;

        var idx = 0,
            offset = 0,
            gains = this.gain[index];

        for (var g = 0; g < groupCount; g++) {
            var len = info.groupLength[g];

            for (var sfb = 0; sfb < maxSFB; sfb++, idx++) {
                if (bandTypes[idx] !== ICStream.ZERO_BT) {
                    var gain = gains[idx];
                    for (var group = 0; group < len; group++) {
                        for (var k = swbOffsets[sfb]; k < swbOffsets[swb + 1]; k++) {
                            data[offset + group * 128 + k] += gain * iqData[offset + group * 128 + k];
                        }
                    }
                }
            }

            offset += len * 128;
        }
    }
};

module.exports = CCEElement;

},{"./huffman":7,"./ics":8}],3:[function(require,module,exports){
/*
 * AAC.js - Advanced Audio Coding decoder in JavaScript
 * Created by Devon Govett
 * Copyright (c) 2012, Official.fm Labs
 *
 * AAC.js is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as 
 * published by the Free Software Foundation; either version 3 of the 
 * License, or (at your option) any later version.
 *
 * AAC.js is distributed in the hope that it will be useful, but WITHOUT 
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General 
 * Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.
 * If not, see <http://www.gnu.org/licenses/>.
 */

var ICStream = require('./ics');
    
// Channel Pair Element
function CPEElement(config) {
    this.ms_used = [];
    this.left = new ICStream(config);
    this.right = new ICStream(config);
}

var MAX_MS_MASK = 128;

var MASK_TYPE_ALL_0 = 0,
      MASK_TYPE_USED = 1,
      MASK_TYPE_ALL_1 = 2,
      MASK_TYPE_RESERVED = 3;

CPEElement.prototype.decode = function(stream, config) {
    var left = this.left,
        right = this.right,
        ms_used = this.ms_used;
        
    if (this.commonWindow = !!stream.read(1)) {
        left.info.decode(stream, config, true);
        right.info = left.info;

        var mask = stream.read(2);
        this.maskPresent = !!mask;
        
        switch (mask) {
            case MASK_TYPE_USED:
                var len = left.info.groupCount * left.info.maxSFB;
                for (var i = 0; i < len; i++) {
                    ms_used[i] = !!stream.read(1);
                }
                break;
            
            case MASK_TYPE_ALL_0:    
            case MASK_TYPE_ALL_1:
                var val = !!mask;
                for (var i = 0; i < MAX_MS_MASK; i++) {
                    ms_used[i] = val;
                }
                break;
                
            default:
                throw new Error("Reserved ms mask type: " + mask);
        }
    } else {
        for (var i = 0; i < MAX_MS_MASK; i++)
            ms_used[i] = false;
    }
    
    left.decode(stream, config, this.commonWindow);
    right.decode(stream, config, this.commonWindow);
};

module.exports = CPEElement;

},{"./ics":8}],4:[function(require,module,exports){
(function (global){
/*
 * AAC.js - Advanced Audio Coding decoder in JavaScript
 * Created by Devon Govett
 * Copyright (c) 2012, Official.fm Labs
 *
 * AAC.js is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as 
 * published by the Free Software Foundation; either version 3 of the 
 * License, or (at your option) any later version.
 *
 * AAC.js is distributed in the hope that it will be useful, but WITHOUT 
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General 
 * Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.
 * If not, see <http://www.gnu.org/licenses/>.
 */

var AV          = (typeof window !== "undefined" ? window['AV'] : typeof global !== "undefined" ? global['AV'] : null);
var ADTSDemuxer = require('./adts_demuxer');
var ICStream    = require('./ics');
var CPEElement  = require('./cpe');
var CCEElement  = require('./cce');
var FilterBank  = require('./filter_bank');
var tables      = require('./tables');

var AACDecoder = AV.Decoder.extend(function() {
    AV.Decoder.register('mp4a', this);
    AV.Decoder.register('aac ', this);
    
    //AAC配置文件
    var AOT_AAC_MAIN = 1, // no
          AOT_AAC_LC = 2,   // yes
          AOT_AAC_LTP = 4,  // no
          AOT_ESCAPE = 31;
          
    // Channel configurations
    var CHANNEL_CONFIG_NONE = 0,
          CHANNEL_CONFIG_MONO = 1,
          CHANNEL_CONFIG_STEREO = 2,
          CHANNEL_CONFIG_STEREO_PLUS_CENTER = 3,
          CHANNEL_CONFIG_STEREO_PLUS_CENTER_PLUS_REAR_MONO = 4,
          CHANNEL_CONFIG_FIVE = 5,
          CHANNEL_CONFIG_FIVE_PLUS_ONE = 6,
          CHANNEL_CONFIG_SEVEN_PLUS_ONE = 8;
          
    this.prototype.init = function() {
      this.format.floatingPoint = true;
    }
    
    this.prototype.setCookie = function(buffer) {
        var data = AV.Stream.fromBuffer(buffer),
            stream = new AV.Bitstream(data);
        
        this.config = {};
        
        this.config.profile = stream.read(5);
        if (this.config.profile === AOT_ESCAPE)
            this.config.profile = 32 + stream.read(6);
            
        this.config.sampleIndex = stream.read(4);
        if (this.config.sampleIndex === 0x0f) {
            this.config.sampleRate = stream.read(24);
            for (var i = 0; i < tables.SAMPLE_RATES.length; i++) {
                if (tables.SAMPLE_RATES[i] === this.config.sampleRate) {
                    this.config.sampleIndex = i;
                    break;
                }
            }
        } else {
            this.config.sampleRate = tables.SAMPLE_RATES[this.config.sampleIndex];
        }
            
        this.config.chanConfig = stream.read(4);
        this.format.channelsPerFrame = this.config.chanConfig; // 有时m4a文件编码错误
        
        switch (this.config.profile) {
            case AOT_AAC_MAIN:
            case AOT_AAC_LC:
            case AOT_AAC_LTP:
                if (stream.read(1)) // 框架长度标志
                    throw new Error('frameLengthFlag not supported');//不支持frameLengthFlag
                    
                this.config.frameLength = 1024;
                    
                if (stream.read(1)) // 依附
                    stream.advance(14); // 核心编码器延迟
                    
                if (stream.read(1)) { // 扩展标志
                    if (this.config.profile > 16) { // 容错配置文件
                        this.config.sectionDataResilience = stream.read(1);
                        this.config.scalefactorResilience = stream.read(1);
                        this.config.spectralDataResilience = stream.read(1);
                    }
                    
                    stream.advance(1);
                }
                
                if (this.config.chanConfig === CHANNEL_CONFIG_NONE) {
                    stream.advance(4) // element_instance_tag
                    throw new Error('PCE unimplemented');
                }
                
                break;
                
            default:
                throw new Error('AAC profile ' + this.config.profile + ' not supported.');
        }
        
        this.filter_bank = new FilterBank(false, this.config.chanConfig);        
    };
    
    var SCE_ELEMENT = 0,
          CPE_ELEMENT = 1,
          CCE_ELEMENT = 2,
          LFE_ELEMENT = 3,
          DSE_ELEMENT = 4,
          PCE_ELEMENT = 5,
          FIL_ELEMENT = 6,
          END_ELEMENT = 7;
    
    // 主要解码功能。
    this.prototype.readChunk = function() {
        var stream = this.bitstream;
        
        // 检查是否有ADTS标题，如果有，请阅读
        if (stream.peek(12) === 0xfff)
            ADTSDemuxer.readHeader(stream);
        
        this.cces = [];
        var elements = [],
            config = this.config,
            frameLength = config.frameLength,
            elementType = null;
         // console.log("stream.peek(12)stream.peek(12)",stream.peek(12))
     // if (stream.peek(12) == 21 || stream.peek(12) ==18 || stream.peek(12) ==19 || stream.peek(12) ==20 || stream.peek(12) ==0 || stream.peek(12) ==2262){
        // console.log("捅到里面=========>>>>>>>",(elementType = stream.read(3)) !== END_ELEMENT);
		while ((elementType = stream.read(3)) !== END_ELEMENT) {
            var id = stream.read(4);
            
            switch (elementType) {
                // 单通道和低频元件
                case SCE_ELEMENT:
                case LFE_ELEMENT:
                    var ics = new ICStream(this.config);
                    ics.id = id;
                    elements.push(ics);
                    ics.decode(stream, config, false);
                    break;
                    
                // 通道对元件
                case CPE_ELEMENT:
                    var cpe = new CPEElement(this.config);
                    cpe.id = id;
                    elements.push(cpe);
                    cpe.decode(stream, config);
                    break;
                
                // 通道耦合元件
                case CCE_ELEMENT:
                    var cce = new CCEElement(this.config);
                    this.cces.push(cce);
                    cce.decode(stream, config);
                    break;
                    
                // 数据流元素
                case DSE_ELEMENT:
                    var align = stream.read(1),
                        count = stream.read(8);
                        
                    if (count === 255)
                        count += stream.read(8);
                        
                    if (align)
                        stream.align();
                        
                    // 暂时跳过。。。
                    console.log('暂时跳过1')
                    stream.advance(count * 8);
                    break;
                    
                // 程序配置元素
                case PCE_ELEMENT:
                    throw new Error("TODO: PCE_ELEMENT")
                    break;
                    
                // 填充元件
                case FIL_ELEMENT:
                    if (id === 15)
                        id += stream.read(8) - 1;
                        
                    // 暂时跳过。。。
                    stream.advance(id * 8);
                    break;
                    
                default:
                    throw new Error('Unknown element')
            }
        }
    // }
        
        stream.align();
        this.process(elements);
        
        // Interleave channels
        var data = this.data,
            channels = data.length,
            output = new Float32Array(frameLength * channels),
            j = 0;
            
        for (var k = 0; k < frameLength; k++) {
            for (var i = 0; i < channels; i++) {
                output[j++] = data[i][k] / 32768;
            }
        }
        
        return output;
    };
    
    this.prototype.process = function(elements) {
        var channels = this.config.chanConfig;
        
        // if (channels === 1 &&  psPresent)
        // TODO: sbrPresent (2)
        var mult = 1;
        
        var len = mult * this.config.frameLength;
        var data = this.data = [];
        
        // Initialize channels
        for (var i = 0; i < channels; i++) {
            data[i] = new Float32Array(len);
        }
        
        var channel = 0;
        for (var i = 0; i < elements.length && channel < channels; i++) {
            var e = elements[i];
            
            if (e instanceof ICStream) { // SCE或LFE元件
                channel += this.processSingle(e, channel);
            } else if (e instanceof CPEElement) {
                this.processPair(e, channel);
                channel += 2;
            } else if (e instanceof CCEElement) {
                channel++;
            } else {
                throw new Error("Unknown element found.")
            }
        }
    };
    
    this.prototype.processSingle = function(element, channel) {
        var profile = this.config.profile,
            info = element.info,
            data = element.data;
            
        if (profile === AOT_AAC_MAIN)
            throw new Error("Main prediction unimplemented");
            
        if (profile === AOT_AAC_LTP)
            throw new Error("LTP prediction unimplemented");
            
        this.applyChannelCoupling(element, CCEElement.BEFORE_TNS, data, null);
        
        if (element.tnsPresent)
            element.tns.process(element, data, false);
            
        this.applyChannelCoupling(element, CCEElement.AFTER_TNS, data, null);
        
        // 滤波器
        this.filter_bank.process(info, data, this.data[channel], channel);
        
        if (profile === AOT_AAC_LTP)
            throw new Error("LTP prediction unimplemented");
        
        this.applyChannelCoupling(element, CCEElement.AFTER_IMDCT, this.data[channel], null);
        
        if (element.gainPresent)
            throw new Error("Gain control not implemented");
            
        if (this.sbrPresent)
            throw new Error("SBR not implemented");
            
        return 1;
    };
    
    this.prototype.processPair = function(element, channel) {
        var profile = this.config.profile,
            left = element.left,
            right = element.right,
            l_info = left.info,
            r_info = right.info,
            l_data = left.data,
            r_data = right.data;
            
        // 中置立体声
        if (element.commonWindow && element.maskPresent)
            this.processMS(element, l_data, r_data);
            
        if (profile === AOT_AAC_MAIN)
            throw new Error("Main prediction unimplemented");
        
        // 强度立体声  
        this.processIS(element, l_data, r_data);
            
        if (profile === AOT_AAC_LTP)
            throw new Error("LTP prediction unimplemented");
            
        this.applyChannelCoupling(element, CCEElement.BEFORE_TNS, l_data, r_data);
        
        if (left.tnsPresent)
            left.tns.process(left, l_data, false);
            
        if (right.tnsPresent)
            right.tns.process(right, r_data, false);
        
        this.applyChannelCoupling(element, CCEElement.AFTER_TNS, l_data, r_data);
        
        // filterbank
        this.filter_bank.process(l_info, l_data, this.data[channel], channel);
        this.filter_bank.process(r_info, r_data, this.data[channel + 1], channel + 1);
        
        if (profile === AOT_AAC_LTP)
            throw new Error("LTP prediction unimplemented");
        
        this.applyChannelCoupling(element, CCEElement.AFTER_IMDCT, this.data[channel], this.data[channel + 1]);
        
        if (left.gainPresent)
            throw new Error("Gain control not implemented");
            
        if (right.gainPresent)
            throw new Error("Gain control not implemented");
            
        if (this.sbrPresent)
            throw new Error("SBR not implemented");
    };
    
    // Intensity stereo
    this.prototype.processIS = function(element, left, right) {
        var ics = element.right,
            info = ics.info,
            offsets = info.swbOffsets,
            windowGroups = info.groupCount,
            maxSFB = info.maxSFB,
            bandTypes = ics.bandTypes,
            sectEnd = ics.sectEnd,
            scaleFactors = ics.scaleFactors;
        
        var idx = 0, groupOff = 0;
        for (var g = 0; g < windowGroups; g++) {
            for (var i = 0; i < maxSFB;) {
                var end = sectEnd[idx];
                
                if (bandTypes[idx] === ICStream.INTENSITY_BT || bandTypes[idx] === ICStream.INTENSITY_BT2) {
                    for (; i < end; i++, idx++) {
                        var c = bandTypes[idx] === ICStream.INTENSITY_BT ? 1 : -1;
                        if (element.maskPresent)
                            c *= element.ms_used[idx] ? -1 : 1;
                            
                        var scale = c * scaleFactors[idx];
                        for (var w = 0; w < info.groupLength[g]; w++) {
                            var off = groupOff + w * 128 + offsets[i],
                                len = offsets[i + 1] - offsets[i];
                                
                            for (var j = 0; j < len; j++) {
                                right[off + j] = left[off + j] * scale;
                            }
                        }
                    }
                } else  {
                    idx += end - i;
                    i = end;
                }
            }
            
            groupOff += info.groupLength[g] * 128;
        }
    };
    
    // Mid-side stereo
    this.prototype.processMS = function(element, left, right) {
        var ics = element.left,
            info = ics.info,
            offsets = info.swbOffsets,
            windowGroups = info.groupCount,
            maxSFB = info.maxSFB,
            sfbCBl = ics.bandTypes,
            sfbCBr = element.right.bandTypes;
            
        var groupOff = 0, idx = 0;
        for (var g = 0; g < windowGroups; g++) {
            for (var i = 0; i < maxSFB; i++, idx++) {
                if (element.ms_used[idx] && sfbCBl[idx] < ICStream.NOISE_BT && sfbCBr[idx] < ICStream.NOISE_BT) {
                    for (var w = 0; w < info.groupLength[g]; w++) {
                        var off = groupOff + w * 128 + offsets[i];
                        for (var j = 0; j < offsets[i + 1] - offsets[i]; j++) {
                            var t = left[off + j] - right[off + j];
                            left[off + j] += right[off + j];
                            right[off + j] = t;
                        }
                    }
                }
            }
            groupOff += info.groupLength[g] * 128;
        }
    };
    
    this.prototype.applyChannelCoupling = function(element, couplingPoint, data1, data2) {
        var cces = this.cces,
            isChannelPair = element instanceof CPEElement,
            applyCoupling = couplingPoint === CCEElement.AFTER_IMDCT ? 'applyIndependentCoupling' : 'applyDependentCoupling';
        
        for (var i = 0; i < cces.length; i++) {
            var cce = cces[i],
                index = 0;
                
            if (cce.couplingPoint === couplingPoint) {
                for (var c = 0; c < cce.coupledCount; c++) {
                    var chSelect = cce.chSelect[c];
                    if (cce.channelPair[c] === isChannelPair && cce.idSelect[c] === element.id) {
                        if (chSelect !== 1) {
                            cce[applyCoupling](index, data1);
                            if (chSelect) index++;
                        }
                        
                        if (chSelect !== 2)
                            cce[applyCoupling](index++, data2);
                            
                    } else {
                        index += 1 + (chSelect === 3 ? 1 : 0);
                    }
                }
            }
        }
    };
    
});

module.exports = AACDecoder;

}).call(this,typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./adts_demuxer":1,"./cce":2,"./cpe":3,"./filter_bank":6,"./ics":8,"./tables":11}],5:[function(require,module,exports){

function FFT(length) {
    this.length = length;

    switch (length) {
        case 64:
            this.roots = generateFFTTableShort(64);
            break;

        case 512:
            this.roots = generateFFTTableLong(512);
            break;

        case 60:
            this.roots = generateFFTTableShort(60);
            break;

        case 480:
            this.roots = generateFFTTableLong(480);
            break;

        default:
            throw new Error("unexpected FFT length: " + length);
    }

    // 处理缓冲区
    this.rev = new Array(length);
    for (var i = 0; i < length; i++) {
        this.rev[i] = new Float32Array(2);
    }

    this.a = new Float32Array(2);
    this.b = new Float32Array(2);
    this.c = new Float32Array(2);
    this.d = new Float32Array(2);     
    this.e1 = new Float32Array(2);
    this.e2 = new Float32Array(2);
}

function generateFFTTableShort(len) {
    var t = 2 * Math.PI / len,
        cosT = Math.cos(t),
        sinT = Math.sin(t),
        f = new Array(len);

    for (var i = 0; i < len; i++) {
        f[i] = new Float32Array(2);
    }

    f[0][0] = 1;
    f[0][1] = 0;
    var lastImag = 0;

    for (var i = 1; i < len; i++) {
        f[i][0] = f[i - 1][0] * cosT + lastImag * sinT;
        lastImag = lastImag * cosT - f[i - 1][0] * sinT;
        f[i][1] = -lastImag;
    }

    return f;
}

function generateFFTTableLong(len) {
    var t = 2 * Math.PI / len,
        cosT = Math.cos(t),
        sinT = Math.sin(t),
        f = new Array(len);

    for (var i = 0; i < len; i++) {
        f[i] = new Float32Array(3);
    }

    f[0][0] = 1;
    f[0][1] = 0;
    f[0][2] = 0;

    for (var i = 1; i < len; i++) {
        f[i][0] = f[i - 1][0] * cosT + f[i - 1][2] * sinT;
        f[i][2] = f[i - 1][2] * cosT - f[i - 1][0] * sinT;
        f[i][1] = -f[i][2];
    }

    return f;
}

FFT.prototype.process = function(input, forward) {
    var length = this.length,
        imOffset = (forward ? 2 : 1),
        scale = (forward ? length : 1),
        rev = this.rev,
        roots = this.roots;

    // 码位倒读
    var ii = 0;
    for (var i = 0; i < length; i++) {
        rev[i][0] = input[ii][0];
        rev[i][1] = input[ii][1];

        var k = length >>> 1;
        while (ii >= k && k > 0) {
            ii -= k;
            k >>= 1;
        }

        ii += k;
    }

    var a = this.a,
        b = this.b,
        c = this.c,
        d = this.d,
        e1 = this.e1,
        e2 = this.e2;

    for (var i = 0; i < length; i++) {
        input[i][0] = rev[i][0];
        input[i][1] = rev[i][1];
    }

    // 底基-4圆
    for (var i = 0; i < length; i += 4) {
        a[0] = input[i][0] + input[i + 1][0];
        a[1] = input[i][1] + input[i + 1][1];
        b[0] = input[i + 2][0] + input[i + 3][0];
        b[1] = input[i + 2][1] + input[i + 3][1];
        c[0] = input[i][0] - input[i + 1][0];
        c[1] = input[i][1] - input[i + 1][1];
        d[0] = input[i + 2][0] - input[i + 3][0];
        d[1] = input[i + 2][1] - input[i + 3][1];
        input[i][0] = a[0] + b[0];
        input[i][1] = a[1] + b[1];
        input[i + 2][0] = a[0] - b[0];
        input[i + 2][1] = a[1] - b[1];

        e1[0] = c[0] - d[1];
        e1[1] = c[1] + d[0];
        e2[0] = c[0] + d[1];
        e2[1] = c[1] - d[0];

        if (forward) {
            input[i + 1][0] = e2[0];
            input[i + 1][1] = e2[1];
            input[i + 3][0] = e1[0];
            input[i + 3][1] = e1[1];
        } else {
            input[i + 1][0] = e1[0];
            input[i + 1][1] = e1[1];
            input[i + 3][0] = e2[0];
            input[i + 3][1] = e2[1];
        }
    }

    // 自下而上的迭代
    for (var i = 4; i < length; i <<= 1) {
        var shift = i << 1,
            m = length / shift;

        for(var j = 0; j < length; j += shift) {
            for(var k = 0; k < i; k++) {
                var km = k * m,
                    rootRe = roots[km][0],
                    rootIm = roots[km][imOffset],
                    zRe = input[i + j + k][0] * rootRe - input[i + j + k][1] * rootIm,
                    zIm = input[i + j + k][0] * rootIm + input[i + j + k][1] * rootRe;

                input[i + j + k][0] = (input[j + k][0] - zRe) * scale;
                input[i + j + k][1] = (input[j + k][1] - zIm) * scale;
                input[j + k][0] = (input[j + k][0] + zRe) * scale;
                input[j + k][1] = (input[j + k][1] + zIm) * scale;
            }
        }
    }
};

module.exports = FFT;

},{}],6:[function(require,module,exports){

var ICStream = require('./ics');
var MDCT = require('./mdct');
  
function FilterBank(smallFrames, channels) {
    if (smallFrames) {
        throw new Error("WHA?? No small frames allowed.");
    }

    this.length = 1024;
    this.shortLength = 128;

    this.mid = (this.length - this.shortLength) / 2;
    this.trans = this.shortLength / 2;

    this.mdctShort = new MDCT(this.shortLength * 2);
    this.mdctLong  = new MDCT(this.length * 2);

    this.overlaps = new Array(channels);
    for (var i = 0; i < channels; i++) {
        this.overlaps[i] = new Float32Array(this.length);
    }

    this.buf = new Float32Array(2 * this.length);
}
  
function generateSineWindow(len) {
    var d = new Float32Array(len);
    for (var i = 0; i < len; i++) {
        d[i] = Math.sin((i + 0.5) * (Math.PI / (2.0 * len)))
    }
    return d;
}

function generateKBDWindow(alpha, len) {
    var PIN = Math.PI / len,
        out = new Float32Array(len),
        sum = 0,
        f = new Float32Array(len),
        alpha2 = (alpha * PIN) * (alpha * PIN);

    for (var n = 0; n < len; n++) {
        var tmp = n * (len - n) * alpha2,
            bessel = 1;

        for (var j = 50; j > 0; j--) {
            bessel = bessel * tmp / (j * j) + 1;
        }

        sum += bessel;
        f[n] = sum;
    }

    sum++;
    for (var n = 0; n < len; n++) {
        out[n] = Math.sqrt(f[n] / sum);
    }

    return out;
}

var SINE_1024 = generateSineWindow(1024),
      SINE_128  = generateSineWindow(128),
      KBD_1024  = generateKBDWindow(4, 1024),
      KBD_128   = generateKBDWindow(6, 128),
      LONG_WINDOWS = [SINE_1024, KBD_1024],
      SHORT_WINDOWS = [SINE_128, KBD_128];

FilterBank.prototype.process = function(info, input, output, channel) {
    var overlap = this.overlaps[channel],
        windowShape = info.windowShape[1],
        windowShapePrev = info.windowShape[0],
        longWindows = LONG_WINDOWS[windowShape],
        shortWindows = SHORT_WINDOWS[windowShape],
        longWindowsPrev = LONG_WINDOWS[windowShapePrev],
        shortWindowsPrev = SHORT_WINDOWS[windowShapePrev],
        length = this.length,
        shortLen = this.shortLength,
        mid = this.mid,
        trans = this.trans,
        buf = this.buf,
        mdctLong = this.mdctLong,
        mdctShort = this.mdctShort;

    switch (info.windowSequence) {
        case ICStream.ONLY_LONG_SEQUENCE:
            mdctLong.process(input, 0, buf, 0);

            // 将前一帧的后半部分输出添加到当前帧的窗口输出
            for (var i = 0; i < length; i++) {
                output[i] = overlap[i] + (buf[i] * longWindowsPrev[i]);
            }

            // 打开下半部分并保存为下一帧的重叠
            for (var i = 0; i < length; i++) {
                overlap[i] = buf[length + i] * longWindows[length - 1 - i];
            }

            break;

        case ICStream.LONG_START_SEQUENCE:
            mdctLong.process(input, 0, buf, 0);

            // 将前一帧的后半部分输出添加到当前帧的窗口输出
            for (var i = 0; i < length; i++) {
                output[i] = overlap[i] + (buf[i] * longWindowsPrev[i]);
            }

            // 打开下半部分并保存为下一帧的重叠
            for (var i = 0; i < mid; i++) {
                overlap[i] = buf[length + i];
            }

            for (var i = 0; i < shortLen; i++) {
                overlap[mid + i] = buf[length + mid + i] * shortWindows[shortLen - i - 1];
            }

            for (var i = 0; i < mid; i++) {
                overlap[mid + shortLen + i] = 0;
            }

            break;

        case ICStream.EIGHT_SHORT_SEQUENCE:
            for (var i = 0; i < 8; i++) {
                mdctShort.process(input, i * shortLen, buf, 2 * i * shortLen);
            }

            // 将前一帧的后半部分输出添加到当前帧的窗口输出
            for (var i = 0; i < mid; i++) {
                output[i] = overlap[i];
            }

            for (var i = 0; i < shortLen; i++) {
                output[mid + i] = overlap[mid + i] + buf[i] * shortWindowsPrev[i];
                output[mid + 1 * shortLen + i] = overlap[mid + shortLen * 1 + i] + (buf[shortLen * 1 + i] * shortWindows[shortLen - 1 - i]) + (buf[shortLen * 2 + i]  * shortWindows[i]);
                output[mid + 2 * shortLen + i] = overlap[mid + shortLen * 2 + i] + (buf[shortLen * 3 + i] * shortWindows[shortLen - 1 - i]) + (buf[shortLen * 4 + i] * shortWindows[i]);
                output[mid + 3 * shortLen + i] = overlap[mid + shortLen * 3 + i] + (buf[shortLen * 5 + i] * shortWindows[shortLen - 1 - i]) + (buf[shortLen * 6 + i] * shortWindows[i]);

                if (i < trans)
                    output[mid + 4 * shortLen + i] = overlap[mid + shortLen * 4 + i] + (buf[shortLen * 7 + i] * shortWindows[shortLen - 1 - i]) + (buf[shortLen * 8 + i] * shortWindows[i]);
            }

            // 开下半部分并保存为下一帧的重叠
            for (var i = 0; i < shortLen; i++) {
                if(i >= trans) 
                    overlap[mid + 4 * shortLen + i - length] = (buf[shortLen * 7 + i] * shortWindows[shortLen - 1 - i]) + (buf[shortLen * 8 + i] * shortWindows[i]);

                overlap[mid + 5 * shortLen + i - length] = (buf[shortLen * 9 + i] * shortWindows[shortLen - 1 - i]) + (buf[shortLen * 10 + i] * shortWindows[i]);
                overlap[mid + 6 * shortLen + i - length] = (buf[shortLen * 11 + i] * shortWindows[shortLen - 1 - i]) + (buf[shortLen * 12 + i]*shortWindows[i]);
                overlap[mid + 7 * shortLen + i - length] = (buf[shortLen * 13 + i] * shortWindows[shortLen - 1 - i]) + (buf[shortLen * 14 + i]*shortWindows[i]);
                overlap[mid + 8 * shortLen + i - length] = (buf[shortLen * 15 + i] * shortWindows[shortLen - 1 - i]);
            }

            for (var i = 0; i < mid; i++) {
                overlap[mid + shortLen + i] = 0;
            }

            break;

        case ICStream.LONG_STOP_SEQUENCE:
            mdctLong.process(input, 0, buf, 0);

       //将前一帧的后半部分输出添加到当前帧的窗口输出

//用1和0填充来构造前半个窗口
            for (var i = 0; i < mid; i++) {
                output[i] = overlap[i];
            }

            for (var i = 0; i < shortLen; i++) {
                output[mid + i] = overlap[mid + i] + (buf[mid + i] * shortWindowsPrev[i]);
            }

            for (var i = 0; i < mid; i++) {
                output[mid + shortLen + i] = overlap[mid + shortLen + i] + buf[mid + shortLen + i];
            }

           
            for (var i = 0; i < length; i++) {
                overlap[i] = buf[length + i] * longWindows[length - 1 - i];
            }

            break;
    }
};

module.exports = FilterBank;

},{"./ics":8,"./mdct":9}],7:[function(require,module,exports){

// [位长度、码字、值…] TDDE 请了解对应的下标值
var HCB1 = [
    [1, 0, 0, 0, 0, 0],
    [5, 16, 1, 0, 0, 0],
    [5, 17, -1, 0, 0, 0],
    [5, 18, 0, 0, 0, -1],
    [5, 19, 0, 1, 0, 0],
    [5, 20, 0, 0, 0, 1],
    [5, 21, 0, 0, -1, 0],
    [5, 22, 0, 0, 1, 0],
    [5, 23, 0, -1, 0, 0],
    [7, 96, 1, -1, 0, 0],
    [7, 97, -1, 1, 0, 0],
    [7, 98, 0, 0, -1, 1],
    [7, 99, 0, 1, -1, 0],
    [7, 100, 0, -1, 1, 0],
    [7, 101, 0, 0, 1, -1],
    [7, 102, 1, 1, 0, 0],
    [7, 103, 0, 0, -1, -1],
    [7, 104, -1, -1, 0, 0],
    [7, 105, 0, -1, -1, 0],
    [7, 106, 1, 0, -1, 0],
    [7, 107, 0, 1, 0, -1],
    [7, 108, -1, 0, 1, 0],
    [7, 109, 0, 0, 1, 1],
    [7, 110, 1, 0, 1, 0],
    [7, 111, 0, -1, 0, 1],
    [7, 112, 0, 1, 1, 0],
    [7, 113, 0, 1, 0, 1],
    [7, 114, -1, 0, -1, 0],
    [7, 115, 1, 0, 0, 1],
    [7, 116, -1, 0, 0, -1],
    [7, 117, 1, 0, 0, -1],
    [7, 118, -1, 0, 0, 1],
    [7, 119, 0, -1, 0, -1],
    [9, 480, 1, 1, -1, 0],
    [9, 481, -1, 1, -1, 0],
    [9, 482, 1, -1, 1, 0],
    [9, 483, 0, 1, 1, -1],
    [9, 484, 0, 1, -1, 1],
    [9, 485, 0, -1, 1, 1],
    [9, 486, 0, -1, 1, -1],
    [9, 487, 1, -1, -1, 0],
    [9, 488, 1, 0, -1, 1],
    [9, 489, 0, 1, -1, -1],
    [9, 490, -1, 1, 1, 0],
    [9, 491, -1, 0, 1, -1],
    [9, 492, -1, -1, 1, 0],
    [9, 493, 0, -1, -1, 1],
    [9, 494, 1, -1, 0, 1],
    [9, 495, 1, -1, 0, -1],
    [9, 496, -1, 1, 0, -1],
    [9, 497, -1, -1, -1, 0],
    [9, 498, 0, -1, -1, -1],
    [9, 499, 0, 1, 1, 1],
    [9, 500, 1, 0, 1, -1],
    [9, 501, 1, 1, 0, 1],
    [9, 502, -1, 1, 0, 1],
    [9, 503, 1, 1, 1, 0],
    [10, 1008, -1, -1, 0, 1],
    [10, 1009, -1, 0, -1, -1],
    [10, 1010, 1, 1, 0, -1],
    [10, 1011, 1, 0, -1, -1],
    [10, 1012, -1, 0, -1, 1],
    [10, 1013, -1, -1, 0, -1],
    [10, 1014, -1, 0, 1, 1],
    [10, 1015, 1, 0, 1, 1],
    [11, 2032, 1, -1, 1, -1],
    [11, 2033, -1, 1, -1, 1],
    [11, 2034, -1, 1, 1, -1],
    [11, 2035, 1, -1, -1, 1],
    [11, 2036, 1, 1, 1, 1],
    [11, 2037, -1, -1, 1, 1],
    [11, 2038, 1, 1, -1, -1],
    [11, 2039, -1, -1, 1, -1],
    [11, 2040, -1, -1, -1, -1],
    [11, 2041, 1, 1, -1, 1],
    [11, 2042, 1, -1, 1, 1],
    [11, 2043, -1, 1, 1, 1],
    [11, 2044, -1, 1, -1, -1],
    [11, 2045, -1, -1, -1, 1],
    [11, 2046, 1, -1, -1, -1],
    [11, 2047, 1, 1, 1, -1]
];

var HCB2 = [
    [3, 0, 0, 0, 0, 0],
    [4, 2, 1, 0, 0, 0],
    [5, 6, -1, 0, 0, 0],
    [5, 7, 0, 0, 0, 1],
    [5, 8, 0, 0, -1, 0],
    [5, 9, 0, 0, 0, -1],
    [5, 10, 0, -1, 0, 0],
    [5, 11, 0, 0, 1, 0],
    [5, 12, 0, 1, 0, 0],
    [6, 26, 0, -1, 1, 0],
    [6, 27, -1, 1, 0, 0],
    [6, 28, 0, 1, -1, 0],
    [6, 29, 0, 0, 1, -1],
    [6, 30, 0, 1, 0, -1],
    [6, 31, 0, 0, -1, 1],
    [6, 32, -1, 0, 0, -1],
    [6, 33, 1, -1, 0, 0],
    [6, 34, 1, 0, -1, 0],
    [6, 35, -1, -1, 0, 0],
    [6, 36, 0, 0, -1, -1],
    [6, 37, 1, 0, 1, 0],
    [6, 38, 1, 0, 0, 1],
    [6, 39, 0, -1, 0, 1],
    [6, 40, -1, 0, 1, 0],
    [6, 41, 0, 1, 0, 1],
    [6, 42, 0, -1, -1, 0],
    [6, 43, -1, 0, 0, 1],
    [6, 44, 0, -1, 0, -1],
    [6, 45, -1, 0, -1, 0],
    [6, 46, 1, 1, 0, 0],
    [6, 47, 0, 1, 1, 0],
    [6, 48, 0, 0, 1, 1],
    [6, 49, 1, 0, 0, -1],
    [7, 100, 0, 1, -1, 1],
    [7, 101, 1, 0, -1, 1],
    [7, 102, -1, 1, -1, 0],
    [7, 103, 0, -1, 1, -1],
    [7, 104, 1, -1, 1, 0],
    [7, 105, 1, 1, 0, -1],
    [7, 106, 1, 0, 1, 1],
    [7, 107, -1, 1, 1, 0],
    [7, 108, 0, -1, -1, 1],
    [7, 109, 1, 1, 1, 0],
    [7, 110, -1, 0, 1, -1],
    [7, 111, -1, -1, -1, 0],
    [7, 112, -1, 0, -1, 1],
    [7, 113, 1, -1, -1, 0],
    [7, 114, 1, 1, -1, 0],
    [8, 230, 1, -1, 0, 1],
    [8, 231, -1, 1, 0, -1],
    [8, 232, -1, -1, 1, 0],
    [8, 233, -1, 0, 1, 1],
    [8, 234, -1, -1, 0, 1],
    [8, 235, -1, -1, 0, -1],
    [8, 236, 0, -1, -1, -1],
    [8, 237, 1, 0, 1, -1],
    [8, 238, 1, 0, -1, -1],
    [8, 239, 0, 1, -1, -1],
    [8, 240, 0, 1, 1, 1],
    [8, 241, -1, 1, 0, 1],
    [8, 242, -1, 0, -1, -1],
    [8, 243, 0, 1, 1, -1],
    [8, 244, 1, -1, 0, -1],
    [8, 245, 0, -1, 1, 1],
    [8, 246, 1, 1, 0, 1],
    [8, 247, 1, -1, 1, -1],
    [8, 248, -1, 1, -1, 1],
    [9, 498, 1, -1, -1, 1],
    [9, 499, -1, -1, -1, -1],
    [9, 500, -1, 1, 1, -1],
    [9, 501, -1, 1, 1, 1],
    [9, 502, 1, 1, 1, 1],
    [9, 503, -1, -1, 1, -1],
    [9, 504, 1, -1, 1, 1],
    [9, 505, -1, 1, -1, -1],
    [9, 506, -1, -1, 1, 1],
    [9, 507, 1, 1, -1, -1],
    [9, 508, 1, -1, -1, -1],
    [9, 509, -1, -1, -1, 1],
    [9, 510, 1, 1, -1, 1],
    [9, 511, 1, 1, 1, -1]
];

var HCB3 = [
    [1, 0, 0, 0, 0, 0],
    [4, 8, 1, 0, 0, 0],
    [4, 9, 0, 0, 0, 1],
    [4, 10, 0, 1, 0, 0],
    [4, 11, 0, 0, 1, 0],
    [5, 24, 1, 1, 0, 0],
    [5, 25, 0, 0, 1, 1],
    [6, 52, 0, 1, 1, 0],
    [6, 53, 0, 1, 0, 1],
    [6, 54, 1, 0, 1, 0],
    [6, 55, 0, 1, 1, 1],
    [6, 56, 1, 0, 0, 1],
    [6, 57, 1, 1, 1, 0],
    [7, 116, 1, 1, 1, 1],
    [7, 117, 1, 0, 1, 1],
    [7, 118, 1, 1, 0, 1],
    [8, 238, 2, 0, 0, 0],
    [8, 239, 0, 0, 0, 2],
    [8, 240, 0, 0, 1, 2],
    [8, 241, 2, 1, 0, 0],
    [8, 242, 1, 2, 1, 0],
    [9, 486, 0, 0, 2, 1],
    [9, 487, 0, 1, 2, 1],
    [9, 488, 1, 2, 0, 0],
    [9, 489, 0, 1, 1, 2],
    [9, 490, 2, 1, 1, 0],
    [9, 491, 0, 0, 2, 0],
    [9, 492, 0, 2, 1, 0],
    [9, 493, 0, 1, 2, 0],
    [9, 494, 0, 2, 0, 0],
    [9, 495, 0, 1, 0, 2],
    [9, 496, 2, 0, 1, 0],
    [9, 497, 1, 2, 1, 1],
    [9, 498, 0, 2, 1, 1],
    [9, 499, 1, 1, 2, 0],
    [9, 500, 1, 1, 2, 1],
    [10, 1002, 1, 2, 0, 1],
    [10, 1003, 1, 0, 2, 0],
    [10, 1004, 1, 0, 2, 1],
    [10, 1005, 0, 2, 0, 1],
    [10, 1006, 2, 1, 1, 1],
    [10, 1007, 1, 1, 1, 2],
    [10, 1008, 2, 1, 0, 1],
    [10, 1009, 1, 0, 1, 2],
    [10, 1010, 0, 0, 2, 2],
    [10, 1011, 0, 1, 2, 2],
    [10, 1012, 2, 2, 1, 0],
    [10, 1013, 1, 2, 2, 0],
    [10, 1014, 1, 0, 0, 2],
    [10, 1015, 2, 0, 0, 1],
    [10, 1016, 0, 2, 2, 1],
    [11, 2034, 2, 2, 0, 0],
    [11, 2035, 1, 2, 2, 1],
    [11, 2036, 1, 1, 0, 2],
    [11, 2037, 2, 0, 1, 1],
    [11, 2038, 1, 1, 2, 2],
    [11, 2039, 2, 2, 1, 1],
    [11, 2040, 0, 2, 2, 0],
    [11, 2041, 0, 2, 1, 2],
    [12, 4084, 1, 0, 2, 2],
    [12, 4085, 2, 2, 0, 1],
    [12, 4086, 2, 1, 2, 0],
    [12, 4087, 2, 2, 2, 0],
    [12, 4088, 0, 2, 2, 2],
    [12, 4089, 2, 2, 2, 1],
    [12, 4090, 2, 1, 2, 1],
    [12, 4091, 1, 2, 1, 2],
    [12, 4092, 1, 2, 2, 2],
    [13, 8186, 0, 2, 0, 2],
    [13, 8187, 2, 0, 2, 0],
    [13, 8188, 1, 2, 0, 2],
    [14, 16378, 2, 0, 2, 1],
    [14, 16379, 2, 1, 1, 2],
    [14, 16380, 2, 1, 0, 2],
    [15, 32762, 2, 2, 2, 2],
    [15, 32763, 2, 2, 1, 2],
    [15, 32764, 2, 1, 2, 2],
    [15, 32765, 2, 0, 1, 2],
    [15, 32766, 2, 0, 0, 2],
    [16, 65534, 2, 2, 0, 2],
    [16, 65535, 2, 0, 2, 2]
];

var HCB4 = [
    [4, 0, 1, 1, 1, 1],
    [4, 1, 0, 1, 1, 1],
    [4, 2, 1, 1, 0, 1],
    [4, 3, 1, 1, 1, 0],
    [4, 4, 1, 0, 1, 1],
    [4, 5, 1, 0, 0, 0],
    [4, 6, 1, 1, 0, 0],
    [4, 7, 0, 0, 0, 0],
    [4, 8, 0, 0, 1, 1],
    [4, 9, 1, 0, 1, 0],
    [5, 20, 1, 0, 0, 1],
    [5, 21, 0, 1, 1, 0],
    [5, 22, 0, 0, 0, 1],
    [5, 23, 0, 1, 0, 1],
    [5, 24, 0, 0, 1, 0],
    [5, 25, 0, 1, 0, 0],
    [7, 104, 2, 1, 1, 1],
    [7, 105, 1, 1, 2, 1],
    [7, 106, 1, 2, 1, 1],
    [7, 107, 1, 1, 1, 2],
    [7, 108, 2, 1, 1, 0],
    [7, 109, 2, 1, 0, 1],
    [7, 110, 1, 2, 1, 0],
    [7, 111, 2, 0, 1, 1],
    [7, 112, 0, 1, 2, 1],
    [8, 226, 0, 1, 1, 2],
    [8, 227, 1, 1, 2, 0],
    [8, 228, 0, 2, 1, 1],
    [8, 229, 1, 0, 1, 2],
    [8, 230, 1, 2, 0, 1],
    [8, 231, 1, 1, 0, 2],
    [8, 232, 1, 0, 2, 1],
    [8, 233, 2, 1, 0, 0],
    [8, 234, 2, 0, 1, 0],
    [8, 235, 1, 2, 0, 0],
    [8, 236, 2, 0, 0, 1],
    [8, 237, 0, 1, 0, 2],
    [8, 238, 0, 2, 1, 0],
    [8, 239, 0, 0, 1, 2],
    [8, 240, 0, 1, 2, 0],
    [8, 241, 0, 2, 0, 1],
    [8, 242, 1, 0, 0, 2],
    [8, 243, 0, 0, 2, 1],
    [8, 244, 1, 0, 2, 0],
    [8, 245, 2, 0, 0, 0],
    [8, 246, 0, 0, 0, 2],
    [9, 494, 0, 2, 0, 0],
    [9, 495, 0, 0, 2, 0],
    [9, 496, 1, 2, 2, 1],
    [9, 497, 2, 2, 1, 1],
    [9, 498, 2, 1, 2, 1],
    [9, 499, 1, 1, 2, 2],
    [9, 500, 1, 2, 1, 2],
    [9, 501, 2, 1, 1, 2],
    [10, 1004, 1, 2, 2, 0],
    [10, 1005, 2, 2, 1, 0],
    [10, 1006, 2, 1, 2, 0],
    [10, 1007, 0, 2, 2, 1],
    [10, 1008, 0, 1, 2, 2],
    [10, 1009, 2, 2, 0, 1],
    [10, 1010, 0, 2, 1, 2],
    [10, 1011, 2, 0, 2, 1],
    [10, 1012, 1, 0, 2, 2],
    [10, 1013, 2, 2, 2, 1],
    [10, 1014, 1, 2, 0, 2],
    [10, 1015, 2, 0, 1, 2],
    [10, 1016, 2, 1, 0, 2],
    [10, 1017, 1, 2, 2, 2],
    [11, 2036, 2, 1, 2, 2],
    [11, 2037, 2, 2, 1, 2],
    [11, 2038, 0, 2, 2, 0],
    [11, 2039, 2, 2, 0, 0],
    [11, 2040, 0, 0, 2, 2],
    [11, 2041, 2, 0, 2, 0],
    [11, 2042, 0, 2, 0, 2],
    [11, 2043, 2, 0, 0, 2],
    [11, 2044, 2, 2, 2, 2],
    [11, 2045, 0, 2, 2, 2],
    [11, 2046, 2, 2, 2, 0],
    [12, 4094, 2, 2, 0, 2],
    [12, 4095, 2, 0, 2, 2]
];

var HCB5 = [
    [1, 0, 0, 0],
    [4, 8, -1, 0],
    [4, 9, 1, 0],
    [4, 10, 0, 1],
    [4, 11, 0, -1],
    [5, 24, 1, -1],
    [5, 25, -1, 1],
    [5, 26, -1, -1],
    [5, 27, 1, 1],
    [7, 112, -2, 0],
    [7, 113, 0, 2],
    [7, 114, 2, 0],
    [7, 115, 0, -2],
    [8, 232, -2, -1],
    [8, 233, 2, 1],
    [8, 234, -1, -2],
    [8, 235, 1, 2],
    [8, 236, -2, 1],
    [8, 237, 2, -1],
    [8, 238, -1, 2],
    [8, 239, 1, -2],
    [8, 240, -3, 0],
    [8, 241, 3, 0],
    [8, 242, 0, -3],
    [8, 243, 0, 3],
    [9, 488, -3, -1],
    [9, 489, 1, 3],
    [9, 490, 3, 1],
    [9, 491, -1, -3],
    [9, 492, -3, 1],
    [9, 493, 3, -1],
    [9, 494, 1, -3],
    [9, 495, -1, 3],
    [9, 496, -2, 2],
    [9, 497, 2, 2],
    [9, 498, -2, -2],
    [9, 499, 2, -2],
    [10, 1000, -3, -2],
    [10, 1001, 3, -2],
    [10, 1002, -2, 3],
    [10, 1003, 2, -3],
    [10, 1004, 3, 2],
    [10, 1005, 2, 3],
    [10, 1006, -3, 2],
    [10, 1007, -2, -3],
    [10, 1008, 0, -4],
    [10, 1009, -4, 0],
    [10, 1010, 4, 1],
    [10, 1011, 4, 0],
    [11, 2024, -4, -1],
    [11, 2025, 0, 4],
    [11, 2026, 4, -1],
    [11, 2027, -1, -4],
    [11, 2028, 1, 4],
    [11, 2029, -1, 4],
    [11, 2030, -4, 1],
    [11, 2031, 1, -4],
    [11, 2032, 3, -3],
    [11, 2033, -3, -3],
    [11, 2034, -3, 3],
    [11, 2035, -2, 4],
    [11, 2036, -4, -2],
    [11, 2037, 4, 2],
    [11, 2038, 2, -4],
    [11, 2039, 2, 4],
    [11, 2040, 3, 3],
    [11, 2041, -4, 2],
    [12, 4084, -2, -4],
    [12, 4085, 4, -2],
    [12, 4086, 3, -4],
    [12, 4087, -4, -3],
    [12, 4088, -4, 3],
    [12, 4089, 3, 4],
    [12, 4090, -3, 4],
    [12, 4091, 4, 3],
    [12, 4092, 4, -3],
    [12, 4093, -3, -4],
    [13, 8188, 4, -4],
    [13, 8189, -4, 4],
    [13, 8190, 4, 4],
    [13, 8191, -4, -4]
];

var HCB6 = [
    [4, 0, 0, 0],
    [4, 1, 1, 0],
    [4, 2, 0, -1],
    [4, 3, 0, 1],
    [4, 4, -1, 0],
    [4, 5, 1, 1],
    [4, 6, -1, 1],
    [4, 7, 1, -1],
    [4, 8, -1, -1],
    [6, 36, 2, -1],
    [6, 37, 2, 1],
    [6, 38, -2, 1],
    [6, 39, -2, -1],
    [6, 40, -2, 0],
    [6, 41, -1, 2],
    [6, 42, 2, 0],
    [6, 43, 1, -2],
    [6, 44, 1, 2],
    [6, 45, 0, -2],
    [6, 46, -1, -2],
    [6, 47, 0, 2],
    [6, 48, 2, -2],
    [6, 49, -2, 2],
    [6, 50, -2, -2],
    [6, 51, 2, 2],
    [7, 104, -3, 1],
    [7, 105, 3, 1],
    [7, 106, 3, -1],
    [7, 107, -1, 3],
    [7, 108, -3, -1],
    [7, 109, 1, 3],
    [7, 110, 1, -3],
    [7, 111, -1, -3],
    [7, 112, 3, 0],
    [7, 113, -3, 0],
    [7, 114, 0, -3],
    [7, 115, 0, 3],
    [7, 116, 3, 2],
    [8, 234, -3, -2],
    [8, 235, -2, 3],
    [8, 236, 2, 3],
    [8, 237, 3, -2],
    [8, 238, 2, -3],
    [8, 239, -2, -3],
    [8, 240, -3, 2],
    [8, 241, 3, 3],
    [9, 484, 3, -3],
    [9, 485, -3, -3],
    [9, 486, -3, 3],
    [9, 487, 1, -4],
    [9, 488, -1, -4],
    [9, 489, 4, 1],
    [9, 490, -4, 1],
    [9, 491, -4, -1],
    [9, 492, 1, 4],
    [9, 493, 4, -1],
    [9, 494, -1, 4],
    [9, 495, 0, -4],
    [9, 496, -4, 2],
    [9, 497, -4, -2],
    [9, 498, 2, 4],
    [9, 499, -2, -4],
    [9, 500, -4, 0],
    [9, 501, 4, 2],
    [9, 502, 4, -2],
    [9, 503, -2, 4],
    [9, 504, 4, 0],
    [9, 505, 2, -4],
    [9, 506, 0, 4],
    [10, 1014, -3, -4],
    [10, 1015, -3, 4],
    [10, 1016, 3, -4],
    [10, 1017, 4, -3],
    [10, 1018, 3, 4],
    [10, 1019, 4, 3],
    [10, 1020, -4, 3],
    [10, 1021, -4, -3],
    [11, 2044, 4, 4],
    [11, 2045, -4, 4],
    [11, 2046, -4, -4],
    [11, 2047, 4, -4]
];

var HCB7 = [
    [1, 0, 0, 0],
    [3, 4, 1, 0],
    [3, 5, 0, 1],
    [4, 12, 1, 1],
    [6, 52, 2, 1],
    [6, 53, 1, 2],
    [6, 54, 2, 0],
    [6, 55, 0, 2],
    [7, 112, 3, 1],
    [7, 113, 1, 3],
    [7, 114, 2, 2],
    [7, 115, 3, 0],
    [7, 116, 0, 3],
    [8, 234, 2, 3],
    [8, 235, 3, 2],
    [8, 236, 1, 4],
    [8, 237, 4, 1],
    [8, 238, 1, 5],
    [8, 239, 5, 1],
    [8, 240, 3, 3],
    [8, 241, 2, 4],
    [8, 242, 0, 4],
    [8, 243, 4, 0],
    [9, 488, 4, 2],
    [9, 489, 2, 5],
    [9, 490, 5, 2],
    [9, 491, 0, 5],
    [9, 492, 6, 1],
    [9, 493, 5, 0],
    [9, 494, 1, 6],
    [9, 495, 4, 3],
    [9, 496, 3, 5],
    [9, 497, 3, 4],
    [9, 498, 5, 3],
    [9, 499, 2, 6],
    [9, 500, 6, 2],
    [9, 501, 1, 7],
    [10, 1004, 3, 6],
    [10, 1005, 0, 6],
    [10, 1006, 6, 0],
    [10, 1007, 4, 4],
    [10, 1008, 7, 1],
    [10, 1009, 4, 5],
    [10, 1010, 7, 2],
    [10, 1011, 5, 4],
    [10, 1012, 6, 3],
    [10, 1013, 2, 7],
    [10, 1014, 7, 3],
    [10, 1015, 6, 4],
    [10, 1016, 5, 5],
    [10, 1017, 4, 6],
    [10, 1018, 3, 7],
    [11, 2038, 7, 0],
    [11, 2039, 0, 7],
    [11, 2040, 6, 5],
    [11, 2041, 5, 6],
    [11, 2042, 7, 4],
    [11, 2043, 4, 7],
    [11, 2044, 5, 7],
    [11, 2045, 7, 5],
    [12, 4092, 7, 6],
    [12, 4093, 6, 6],
    [12, 4094, 6, 7],
    [12, 4095, 7, 7]
];

var HCB8 = [
    [3, 0, 1, 1],
    [4, 2, 2, 1],
    [4, 3, 1, 0],
    [4, 4, 1, 2],
    [4, 5, 0, 1],
    [4, 6, 2, 2],
    [5, 14, 0, 0],
    [5, 15, 2, 0],
    [5, 16, 0, 2],
    [5, 17, 3, 1],
    [5, 18, 1, 3],
    [5, 19, 3, 2],
    [5, 20, 2, 3],
    [6, 42, 3, 3],
    [6, 43, 4, 1],
    [6, 44, 1, 4],
    [6, 45, 4, 2],
    [6, 46, 2, 4],
    [6, 47, 3, 0],
    [6, 48, 0, 3],
    [6, 49, 4, 3],
    [6, 50, 3, 4],
    [6, 51, 5, 2],
    [7, 104, 5, 1],
    [7, 105, 2, 5],
    [7, 106, 1, 5],
    [7, 107, 5, 3],
    [7, 108, 3, 5],
    [7, 109, 4, 4],
    [7, 110, 5, 4],
    [7, 111, 0, 4],
    [7, 112, 4, 5],
    [7, 113, 4, 0],
    [7, 114, 2, 6],
    [7, 115, 6, 2],
    [7, 116, 6, 1],
    [7, 117, 1, 6],
    [8, 236, 3, 6],
    [8, 237, 6, 3],
    [8, 238, 5, 5],
    [8, 239, 5, 0],
    [8, 240, 6, 4],
    [8, 241, 0, 5],
    [8, 242, 4, 6],
    [8, 243, 7, 1],
    [8, 244, 7, 2],
    [8, 245, 2, 7],
    [8, 246, 6, 5],
    [8, 247, 7, 3],
    [8, 248, 1, 7],
    [8, 249, 5, 6],
    [8, 250, 3, 7],
    [9, 502, 6, 6],
    [9, 503, 7, 4],
    [9, 504, 6, 0],
    [9, 505, 4, 7],
    [9, 506, 0, 6],
    [9, 507, 7, 5],
    [9, 508, 7, 6],
    [9, 509, 6, 7],
    [10, 1020, 5, 7],
    [10, 1021, 7, 0],
    [10, 1022, 0, 7],
    [10, 1023, 7, 7]
];

var HCB9 = [
    [1, 0, 0, 0],
    [3, 4, 1, 0],
    [3, 5, 0, 1],
    [4, 12, 1, 1],
    [6, 52, 2, 1],
    [6, 53, 1, 2],
    [6, 54, 2, 0],
    [6, 55, 0, 2],
    [7, 112, 3, 1],
    [7, 113, 2, 2],
    [7, 114, 1, 3],
    [8, 230, 3, 0],
    [8, 231, 0, 3],
    [8, 232, 2, 3],
    [8, 233, 3, 2],
    [8, 234, 1, 4],
    [8, 235, 4, 1],
    [8, 236, 2, 4],
    [8, 237, 1, 5],
    [9, 476, 4, 2],
    [9, 477, 3, 3],
    [9, 478, 0, 4],
    [9, 479, 4, 0],
    [9, 480, 5, 1],
    [9, 481, 2, 5],
    [9, 482, 1, 6],
    [9, 483, 3, 4],
    [9, 484, 5, 2],
    [9, 485, 6, 1],
    [9, 486, 4, 3],
    [10, 974, 0, 5],
    [10, 975, 2, 6],
    [10, 976, 5, 0],
    [10, 977, 1, 7],
    [10, 978, 3, 5],
    [10, 979, 1, 8],
    [10, 980, 8, 1],
    [10, 981, 4, 4],
    [10, 982, 5, 3],
    [10, 983, 6, 2],
    [10, 984, 7, 1],
    [10, 985, 0, 6],
    [10, 986, 8, 2],
    [10, 987, 2, 8],
    [10, 988, 3, 6],
    [10, 989, 2, 7],
    [10, 990, 4, 5],
    [10, 991, 9, 1],
    [10, 992, 1, 9],
    [10, 993, 7, 2],
    [11, 1988, 6, 0],
    [11, 1989, 5, 4],
    [11, 1990, 6, 3],
    [11, 1991, 8, 3],
    [11, 1992, 0, 7],
    [11, 1993, 9, 2],
    [11, 1994, 3, 8],
    [11, 1995, 4, 6],
    [11, 1996, 3, 7],
    [11, 1997, 0, 8],
    [11, 1998, 10, 1],
    [11, 1999, 6, 4],
    [11, 2000, 2, 9],
    [11, 2001, 5, 5],
    [11, 2002, 8, 0],
    [11, 2003, 7, 0],
    [11, 2004, 7, 3],
    [11, 2005, 10, 2],
    [11, 2006, 9, 3],
    [11, 2007, 8, 4],
    [11, 2008, 1, 10],
    [11, 2009, 7, 4],
    [11, 2010, 6, 5],
    [11, 2011, 5, 6],
    [11, 2012, 4, 8],
    [11, 2013, 4, 7],
    [11, 2014, 3, 9],
    [11, 2015, 11, 1],
    [11, 2016, 5, 8],
    [11, 2017, 9, 0],
    [11, 2018, 8, 5],
    [12, 4038, 10, 3],
    [12, 4039, 2, 10],
    [12, 4040, 0, 9],
    [12, 4041, 11, 2],
    [12, 4042, 9, 4],
    [12, 4043, 6, 6],
    [12, 4044, 12, 1],
    [12, 4045, 4, 9],
    [12, 4046, 8, 6],
    [12, 4047, 1, 11],
    [12, 4048, 9, 5],
    [12, 4049, 10, 4],
    [12, 4050, 5, 7],
    [12, 4051, 7, 5],
    [12, 4052, 2, 11],
    [12, 4053, 1, 12],
    [12, 4054, 12, 2],
    [12, 4055, 11, 3],
    [12, 4056, 3, 10],
    [12, 4057, 5, 9],
    [12, 4058, 6, 7],
    [12, 4059, 8, 7],
    [12, 4060, 11, 4],
    [12, 4061, 0, 10],
    [12, 4062, 7, 6],
    [12, 4063, 12, 3],
    [12, 4064, 10, 0],
    [12, 4065, 10, 5],
    [12, 4066, 4, 10],
    [12, 4067, 6, 8],
    [12, 4068, 2, 12],
    [12, 4069, 9, 6],
    [12, 4070, 9, 7],
    [12, 4071, 4, 11],
    [12, 4072, 11, 0],
    [12, 4073, 6, 9],
    [12, 4074, 3, 11],
    [12, 4075, 5, 10],
    [13, 8152, 8, 8],
    [13, 8153, 7, 8],
    [13, 8154, 12, 5],
    [13, 8155, 3, 12],
    [13, 8156, 11, 5],
    [13, 8157, 7, 7],
    [13, 8158, 12, 4],
    [13, 8159, 11, 6],
    [13, 8160, 10, 6],
    [13, 8161, 4, 12],
    [13, 8162, 7, 9],
    [13, 8163, 5, 11],
    [13, 8164, 0, 11],
    [13, 8165, 12, 6],
    [13, 8166, 6, 10],
    [13, 8167, 12, 0],
    [13, 8168, 10, 7],
    [13, 8169, 5, 12],
    [13, 8170, 7, 10],
    [13, 8171, 9, 8],
    [13, 8172, 0, 12],
    [13, 8173, 11, 7],
    [13, 8174, 8, 9],
    [13, 8175, 9, 9],
    [13, 8176, 10, 8],
    [13, 8177, 7, 11],
    [13, 8178, 12, 7],
    [13, 8179, 6, 11],
    [13, 8180, 8, 11],
    [13, 8181, 11, 8],
    [13, 8182, 7, 12],
    [13, 8183, 6, 12],
    [14, 16368, 8, 10],
    [14, 16369, 10, 9],
    [14, 16370, 8, 12],
    [14, 16371, 9, 10],
    [14, 16372, 9, 11],
    [14, 16373, 9, 12],
    [14, 16374, 10, 11],
    [14, 16375, 12, 9],
    [14, 16376, 10, 10],
    [14, 16377, 11, 9],
    [14, 16378, 12, 8],
    [14, 16379, 11, 10],
    [14, 16380, 12, 10],
    [14, 16381, 12, 11],
    [15, 32764, 10, 12],
    [15, 32765, 11, 11],
    [15, 32766, 11, 12],
    [15, 32767, 12, 12]
];

var HCB10 = [
    [4, 0, 1, 1],
    [4, 1, 1, 2],
    [4, 2, 2, 1],
    [5, 6, 2, 2],
    [5, 7, 1, 0],
    [5, 8, 0, 1],
    [5, 9, 1, 3],
    [5, 10, 3, 2],
    [5, 11, 3, 1],
    [5, 12, 2, 3],
    [5, 13, 3, 3],
    [6, 28, 2, 0],
    [6, 29, 0, 2],
    [6, 30, 2, 4],
    [6, 31, 4, 2],
    [6, 32, 1, 4],
    [6, 33, 4, 1],
    [6, 34, 0, 0],
    [6, 35, 4, 3],
    [6, 36, 3, 4],
    [6, 37, 3, 0],
    [6, 38, 0, 3],
    [6, 39, 4, 4],
    [6, 40, 2, 5],
    [6, 41, 5, 2],
    [7, 84, 1, 5],
    [7, 85, 5, 1],
    [7, 86, 5, 3],
    [7, 87, 3, 5],
    [7, 88, 5, 4],
    [7, 89, 4, 5],
    [7, 90, 6, 2],
    [7, 91, 2, 6],
    [7, 92, 6, 3],
    [7, 93, 4, 0],
    [7, 94, 6, 1],
    [7, 95, 0, 4],
    [7, 96, 1, 6],
    [7, 97, 3, 6],
    [7, 98, 5, 5],
    [7, 99, 6, 4],
    [7, 100, 4, 6],
    [8, 202, 6, 5],
    [8, 203, 7, 2],
    [8, 204, 3, 7],
    [8, 205, 2, 7],
    [8, 206, 5, 6],
    [8, 207, 8, 2],
    [8, 208, 7, 3],
    [8, 209, 5, 0],
    [8, 210, 7, 1],
    [8, 211, 0, 5],
    [8, 212, 8, 1],
    [8, 213, 1, 7],
    [8, 214, 8, 3],
    [8, 215, 7, 4],
    [8, 216, 4, 7],
    [8, 217, 2, 8],
    [8, 218, 6, 6],
    [8, 219, 7, 5],
    [8, 220, 1, 8],
    [8, 221, 3, 8],
    [8, 222, 8, 4],
    [8, 223, 4, 8],
    [8, 224, 5, 7],
    [8, 225, 8, 5],
    [8, 226, 5, 8],
    [9, 454, 7, 6],
    [9, 455, 6, 7],
    [9, 456, 9, 2],
    [9, 457, 6, 0],
    [9, 458, 6, 8],
    [9, 459, 9, 3],
    [9, 460, 3, 9],
    [9, 461, 9, 1],
    [9, 462, 2, 9],
    [9, 463, 0, 6],
    [9, 464, 8, 6],
    [9, 465, 9, 4],
    [9, 466, 4, 9],
    [9, 467, 10, 2],
    [9, 468, 1, 9],
    [9, 469, 7, 7],
    [9, 470, 8, 7],
    [9, 471, 9, 5],
    [9, 472, 7, 8],
    [9, 473, 10, 3],
    [9, 474, 5, 9],
    [9, 475, 10, 4],
    [9, 476, 2, 10],
    [9, 477, 10, 1],
    [9, 478, 3, 10],
    [9, 479, 9, 6],
    [9, 480, 6, 9],
    [9, 481, 8, 0],
    [9, 482, 4, 10],
    [9, 483, 7, 0],
    [9, 484, 11, 2],
    [10, 970, 7, 9],
    [10, 971, 11, 3],
    [10, 972, 10, 6],
    [10, 973, 1, 10],
    [10, 974, 11, 1],
    [10, 975, 9, 7],
    [10, 976, 0, 7],
    [10, 977, 8, 8],
    [10, 978, 10, 5],
    [10, 979, 3, 11],
    [10, 980, 5, 10],
    [10, 981, 8, 9],
    [10, 982, 11, 5],
    [10, 983, 0, 8],
    [10, 984, 11, 4],
    [10, 985, 2, 11],
    [10, 986, 7, 10],
    [10, 987, 6, 10],
    [10, 988, 10, 7],
    [10, 989, 4, 11],
    [10, 990, 1, 11],
    [10, 991, 12, 2],
    [10, 992, 9, 8],
    [10, 993, 12, 3],
    [10, 994, 11, 6],
    [10, 995, 5, 11],
    [10, 996, 12, 4],
    [10, 997, 11, 7],
    [10, 998, 12, 5],
    [10, 999, 3, 12],
    [10, 1000, 6, 11],
    [10, 1001, 9, 0],
    [10, 1002, 10, 8],
    [10, 1003, 10, 0],
    [10, 1004, 12, 1],
    [10, 1005, 0, 9],
    [10, 1006, 4, 12],
    [10, 1007, 9, 9],
    [10, 1008, 12, 6],
    [10, 1009, 2, 12],
    [10, 1010, 8, 10],
    [11, 2022, 9, 10],
    [11, 2023, 1, 12],
    [11, 2024, 11, 8],
    [11, 2025, 12, 7],
    [11, 2026, 7, 11],
    [11, 2027, 5, 12],
    [11, 2028, 6, 12],
    [11, 2029, 10, 9],
    [11, 2030, 8, 11],
    [11, 2031, 12, 8],
    [11, 2032, 0, 10],
    [11, 2033, 7, 12],
    [11, 2034, 11, 0],
    [11, 2035, 10, 10],
    [11, 2036, 11, 9],
    [11, 2037, 11, 10],
    [11, 2038, 0, 11],
    [11, 2039, 11, 11],
    [11, 2040, 9, 11],
    [11, 2041, 10, 11],
    [11, 2042, 12, 0],
    [11, 2043, 8, 12],
    [12, 4088, 12, 9],
    [12, 4089, 10, 12],
    [12, 4090, 9, 12],
    [12, 4091, 11, 12],
    [12, 4092, 12, 11],
    [12, 4093, 0, 12],
    [12, 4094, 12, 10],
    [12, 4095, 12, 12]
];

var HCB11 = [
    [4, 0, 0, 0],
    [4, 1, 1, 1],
    [5, 4, 16, 16],
    [5, 5, 1, 0],
    [5, 6, 0, 1],
    [5, 7, 2, 1],
    [5, 8, 1, 2],
    [5, 9, 2, 2],
    [6, 20, 1, 3],
    [6, 21, 3, 1],
    [6, 22, 3, 2],
    [6, 23, 2, 0],
    [6, 24, 2, 3],
    [6, 25, 0, 2],
    [6, 26, 3, 3],
    [7, 54, 4, 1],
    [7, 55, 1, 4],
    [7, 56, 4, 2],
    [7, 57, 2, 4],
    [7, 58, 4, 3],
    [7, 59, 3, 4],
    [7, 60, 3, 0],
    [7, 61, 0, 3],
    [7, 62, 5, 1],
    [7, 63, 5, 2],
    [7, 64, 2, 5],
    [7, 65, 4, 4],
    [7, 66, 1, 5],
    [7, 67, 5, 3],
    [7, 68, 3, 5],
    [7, 69, 5, 4],
    [8, 140, 4, 5],
    [8, 141, 6, 2],
    [8, 142, 2, 6],
    [8, 143, 6, 1],
    [8, 144, 6, 3],
    [8, 145, 3, 6],
    [8, 146, 1, 6],
    [8, 147, 4, 16],
    [8, 148, 3, 16],
    [8, 149, 16, 5],
    [8, 150, 16, 3],
    [8, 151, 16, 4],
    [8, 152, 6, 4],
    [8, 153, 16, 6],
    [8, 154, 4, 0],
    [8, 155, 4, 6],
    [8, 156, 0, 4],
    [8, 157, 2, 16],
    [8, 158, 5, 5],
    [8, 159, 5, 16],
    [8, 160, 16, 7],
    [8, 161, 16, 2],
    [8, 162, 16, 8],
    [8, 163, 2, 7],
    [8, 164, 7, 2],
    [8, 165, 3, 7],
    [8, 166, 6, 5],
    [8, 167, 5, 6],
    [8, 168, 6, 16],
    [8, 169, 16, 10],
    [8, 170, 7, 3],
    [8, 171, 7, 1],
    [8, 172, 16, 9],
    [8, 173, 7, 16],
    [8, 174, 1, 16],
    [8, 175, 1, 7],
    [8, 176, 4, 7],
    [8, 177, 16, 11],
    [8, 178, 7, 4],
    [8, 179, 16, 12],
    [8, 180, 8, 16],
    [8, 181, 16, 1],
    [8, 182, 6, 6],
    [8, 183, 9, 16],
    [8, 184, 2, 8],
    [8, 185, 5, 7],
    [8, 186, 10, 16],
    [8, 187, 16, 13],
    [8, 188, 8, 3],
    [8, 189, 8, 2],
    [8, 190, 3, 8],
    [8, 191, 5, 0],
    [8, 192, 16, 14],
    [8, 193, 11, 16],
    [8, 194, 7, 5],
    [8, 195, 4, 8],
    [8, 196, 6, 7],
    [8, 197, 7, 6],
    [8, 198, 0, 5],
    [9, 398, 8, 4],
    [9, 399, 16, 15],
    [9, 400, 12, 16],
    [9, 401, 1, 8],
    [9, 402, 8, 1],
    [9, 403, 14, 16],
    [9, 404, 5, 8],
    [9, 405, 13, 16],
    [9, 406, 3, 9],
    [9, 407, 8, 5],
    [9, 408, 7, 7],
    [9, 409, 2, 9],
    [9, 410, 8, 6],
    [9, 411, 9, 2],
    [9, 412, 9, 3],
    [9, 413, 15, 16],
    [9, 414, 4, 9],
    [9, 415, 6, 8],
    [9, 416, 6, 0],
    [9, 417, 9, 4],
    [9, 418, 5, 9],
    [9, 419, 8, 7],
    [9, 420, 7, 8],
    [9, 421, 1, 9],
    [9, 422, 10, 3],
    [9, 423, 0, 6],
    [9, 424, 10, 2],
    [9, 425, 9, 1],
    [9, 426, 9, 5],
    [9, 427, 4, 10],
    [9, 428, 2, 10],
    [9, 429, 9, 6],
    [9, 430, 3, 10],
    [9, 431, 6, 9],
    [9, 432, 10, 4],
    [9, 433, 8, 8],
    [9, 434, 10, 5],
    [9, 435, 9, 7],
    [9, 436, 11, 3],
    [9, 437, 1, 10],
    [9, 438, 7, 0],
    [9, 439, 10, 6],
    [9, 440, 7, 9],
    [9, 441, 3, 11],
    [9, 442, 5, 10],
    [9, 443, 10, 1],
    [9, 444, 4, 11],
    [9, 445, 11, 2],
    [9, 446, 13, 2],
    [9, 447, 6, 10],
    [9, 448, 13, 3],
    [9, 449, 2, 11],
    [9, 450, 16, 0],
    [9, 451, 5, 11],
    [9, 452, 11, 5],
    [10, 906, 11, 4],
    [10, 907, 9, 8],
    [10, 908, 7, 10],
    [10, 909, 8, 9],
    [10, 910, 0, 16],
    [10, 911, 4, 13],
    [10, 912, 0, 7],
    [10, 913, 3, 13],
    [10, 914, 11, 6],
    [10, 915, 13, 1],
    [10, 916, 13, 4],
    [10, 917, 12, 3],
    [10, 918, 2, 13],
    [10, 919, 13, 5],
    [10, 920, 8, 10],
    [10, 921, 6, 11],
    [10, 922, 10, 8],
    [10, 923, 10, 7],
    [10, 924, 14, 2],
    [10, 925, 12, 4],
    [10, 926, 1, 11],
    [10, 927, 4, 12],
    [10, 928, 11, 1],
    [10, 929, 3, 12],
    [10, 930, 1, 13],
    [10, 931, 12, 2],
    [10, 932, 7, 11],
    [10, 933, 3, 14],
    [10, 934, 5, 12],
    [10, 935, 5, 13],
    [10, 936, 14, 4],
    [10, 937, 4, 14],
    [10, 938, 11, 7],
    [10, 939, 14, 3],
    [10, 940, 12, 5],
    [10, 941, 13, 6],
    [10, 942, 12, 6],
    [10, 943, 8, 0],
    [10, 944, 11, 8],
    [10, 945, 2, 12],
    [10, 946, 9, 9],
    [10, 947, 14, 5],
    [10, 948, 6, 13],
    [10, 949, 10, 10],
    [10, 950, 15, 2],
    [10, 951, 8, 11],
    [10, 952, 9, 10],
    [10, 953, 14, 6],
    [10, 954, 10, 9],
    [10, 955, 5, 14],
    [10, 956, 11, 9],
    [10, 957, 14, 1],
    [10, 958, 2, 14],
    [10, 959, 6, 12],
    [10, 960, 1, 12],
    [10, 961, 13, 8],
    [10, 962, 0, 8],
    [10, 963, 13, 7],
    [10, 964, 7, 12],
    [10, 965, 12, 7],
    [10, 966, 7, 13],
    [10, 967, 15, 3],
    [10, 968, 12, 1],
    [10, 969, 6, 14],
    [10, 970, 2, 15],
    [10, 971, 15, 5],
    [10, 972, 15, 4],
    [10, 973, 1, 14],
    [10, 974, 9, 11],
    [10, 975, 4, 15],
    [10, 976, 14, 7],
    [10, 977, 8, 13],
    [10, 978, 13, 9],
    [10, 979, 8, 12],
    [10, 980, 5, 15],
    [10, 981, 3, 15],
    [10, 982, 10, 11],
    [10, 983, 11, 10],
    [10, 984, 12, 8],
    [10, 985, 15, 6],
    [10, 986, 15, 7],
    [10, 987, 8, 14],
    [10, 988, 15, 1],
    [10, 989, 7, 14],
    [10, 990, 9, 0],
    [10, 991, 0, 9],
    [10, 992, 9, 13],
    [10, 993, 9, 12],
    [10, 994, 12, 9],
    [10, 995, 14, 8],
    [10, 996, 10, 13],
    [10, 997, 14, 9],
    [10, 998, 12, 10],
    [10, 999, 6, 15],
    [10, 1000, 7, 15],
    [11, 2002, 9, 14],
    [11, 2003, 15, 8],
    [11, 2004, 11, 11],
    [11, 2005, 11, 14],
    [11, 2006, 1, 15],
    [11, 2007, 10, 12],
    [11, 2008, 10, 14],
    [11, 2009, 13, 11],
    [11, 2010, 13, 10],
    [11, 2011, 11, 13],
    [11, 2012, 11, 12],
    [11, 2013, 8, 15],
    [11, 2014, 14, 11],
    [11, 2015, 13, 12],
    [11, 2016, 12, 13],
    [11, 2017, 15, 9],
    [11, 2018, 14, 10],
    [11, 2019, 10, 0],
    [11, 2020, 12, 11],
    [11, 2021, 9, 15],
    [11, 2022, 0, 10],
    [11, 2023, 12, 12],
    [11, 2024, 11, 0],
    [11, 2025, 12, 14],
    [11, 2026, 10, 15],
    [11, 2027, 13, 13],
    [11, 2028, 0, 13],
    [11, 2029, 14, 12],
    [11, 2030, 15, 10],
    [11, 2031, 15, 11],
    [11, 2032, 11, 15],
    [11, 2033, 14, 13],
    [11, 2034, 13, 0],
    [11, 2035, 0, 11],
    [11, 2036, 13, 14],
    [11, 2037, 15, 12],
    [11, 2038, 15, 13],
    [11, 2039, 12, 15],
    [11, 2040, 14, 0],
    [11, 2041, 14, 14],
    [11, 2042, 13, 15],
    [11, 2043, 12, 0],
    [11, 2044, 14, 15],
    [12, 4090, 0, 14],
    [12, 4091, 0, 12],
    [12, 4092, 15, 14],
    [12, 4093, 15, 0],
    [12, 4094, 0, 15],
    [12, 4095, 15, 15]
];

var HCB_SF = [
    [1, 0, 60],
    [3, 4, 59],
    [4, 10, 61],
    [4, 11, 58],
    [4, 12, 62],
    [5, 26, 57],
    [5, 27, 63],
    [6, 56, 56],
    [6, 57, 64],
    [6, 58, 55],
    [6, 59, 65],
    [7, 120, 66],
    [7, 121, 54],
    [7, 122, 67],
    [8, 246, 53],
    [8, 247, 68],
    [8, 248, 52],
    [8, 249, 69],
    [8, 250, 51],
    [9, 502, 70],
    [9, 503, 50],
    [9, 504, 49],
    [9, 505, 71],
    [10, 1012, 72],
    [10, 1013, 48],
    [10, 1014, 73],
    [10, 1015, 47],
    [10, 1016, 74],
    [10, 1017, 46],
    [11, 2036, 76],
    [11, 2037, 75],
    [11, 2038, 77],
    [11, 2039, 78],
    [11, 2040, 45],
    [11, 2041, 43],
    [12, 4084, 44],
    [12, 4085, 79],
    [12, 4086, 42],
    [12, 4087, 41],
    [12, 4088, 80],
    [12, 4089, 40],
    [13, 8180, 81],
    [13, 8181, 39],
    [13, 8182, 82],
    [13, 8183, 38],
    [13, 8184, 83],
    [14, 16370, 37],
    [14, 16371, 35],
    [14, 16372, 85],
    [14, 16373, 33],
    [14, 16374, 36],
    [14, 16375, 34],
    [14, 16376, 84],
    [14, 16377, 32],
    [15, 32756, 87],
    [15, 32757, 89],
    [15, 32758, 30],
    [15, 32759, 31],
    [16, 65520, 86],
    [16, 65521, 29],
    [16, 65522, 26],
    [16, 65523, 27],
    [16, 65524, 28],
    [16, 65525, 24],
    [16, 65526, 88],
    [17, 131054, 25],
    [17, 131055, 22],
    [17, 131056, 23],
    [18, 262114, 90],
    [18, 262115, 21],
    [18, 262116, 19],
    [18, 262117, 3],
    [18, 262118, 1],
    [18, 262119, 2],
    [18, 262120, 0],
    [19, 524242, 98],
    [19, 524243, 99],
    [19, 524244, 100],
    [19, 524245, 101],
    [19, 524246, 102],
    [19, 524247, 117],
    [19, 524248, 97],
    [19, 524249, 91],
    [19, 524250, 92],
    [19, 524251, 93],
    [19, 524252, 94],
    [19, 524253, 95],
    [19, 524254, 96],
    [19, 524255, 104],
    [19, 524256, 111],
    [19, 524257, 112],
    [19, 524258, 113],
    [19, 524259, 114],
    [19, 524260, 115],
    [19, 524261, 116],
    [19, 524262, 110],
    [19, 524263, 105],
    [19, 524264, 106],
    [19, 524265, 107],
    [19, 524266, 108],
    [19, 524267, 109],
    [19, 524268, 118],
    [19, 524269, 6],
    [19, 524270, 8],
    [19, 524271, 9],
    [19, 524272, 10],
    [19, 524273, 5],
    [19, 524274, 103],
    [19, 524275, 120],
    [19, 524276, 119],
    [19, 524277, 4],
    [19, 524278, 7],
    [19, 524279, 15],
    [19, 524280, 16],
    [19, 524281, 18],
    [19, 524282, 20],
    [19, 524283, 17],
    [19, 524284, 11],
    [19, 524285, 12],
    [19, 524286, 14],
    [19, 524287, 13]
];

var CODEBOOKS = [HCB1, HCB2, HCB3, HCB4, HCB5, HCB6, HCB7, HCB8, HCB9, HCB10, HCB11];
var UNSIGNED = [false, false, true, true, false, false, true, true, true, true, true],
      QUAD_LEN = 4, 
      PAIR_LEN = 2;

var Huffman = {
    findOffset: function(stream, table) {
        var off = 0,
            len = table[off][0],
            cw = stream.read(len);
            
        while (cw !== table[off][1]) {
            var j = table[++off][0] - len;
            len = table[off][0];
            cw <<= j;
            cw |= stream.read(j);
        }
        
        return off;
    },
    
    signValues: function(stream, data, off, len) {
        for (var i = off; i < off + len; i++) {
            if (data[i] && stream.read(1))
                data[i] = -data[i];
        }
    },
    
    getEscape: function(stream, s) {
        var i = 4;
        while (stream.read(1))
            i++;
            
        var j = stream.read(i) | (1 << i);
        return s < 0 ? -j : j;
    },
    
    decodeScaleFactor: function(stream) {
        var offset = this.findOffset(stream, HCB_SF);
        return HCB_SF[offset][2];
    },
    
    decodeSpectralData: function(stream, cb, data, off) {
        var HCB = CODEBOOKS[cb - 1],
            offset = this.findOffset(stream, HCB);
            
        data[off] = HCB[offset][2];
        data[off + 1] = HCB[offset][3];
        
        if (cb < 5) {
            data[off + 2] = HCB[offset][4];
            data[off + 3] = HCB[offset][5];
        }
        
        // sign and escape
        if (cb < 11) {
            if (UNSIGNED[cb - 1])
                this.signValues(stream, data, off, cb < 5 ? QUAD_LEN : PAIR_LEN);
                
        } else if (cb === 11 || cb > 15) {
            this.signValues(stream, data, off, cb < 5 ? QUAD_LEN : PAIR_LEN);
            
            if (Math.abs(data[off]) === 16) 
                data[off] = this.getEscape(stream, data[off]);
                
            if (Math.abs(data[off + 1]) === 16)
                data[off + 1] = this.getEscape(stream, data[off + 1]);
        } else {
            throw new Error("Huffman: unknown spectral codebook: " + cb);
        }
    }
};

module.exports = Huffman;

},{}],8:[function(require,module,exports){

var tables = require('./tables');
var Huffman = require('./huffman');
var TNS = require('./tns');
    
// 单个通道流
function ICStream(config) {
    this.info = new ICSInfo();
    this.bandTypes = new Int32Array(MAX_SECTIONS);
    this.sectEnd = new Int32Array(MAX_SECTIONS);
    this.data = new Float32Array(config.frameLength);
    this.scaleFactors = new Float32Array(MAX_SECTIONS);
    this.randomState = 0x1F2E3D4C;
    this.tns = new TNS(config);
    this.specBuf = new Int32Array(4);
}
  //TDDE 请了解对应的赋值
ICStream.ZERO_BT = 0;         // 标度因子和光谱数据都是零。
ICStream.FIRST_PAIR_BT = 5;   // 这个和后面的波段类型用一个码字编码两个值（而不是四个）。
ICStream.ESC_BT = 11;         // 光谱数据用转义序列编码。
ICStream.NOISE_BT = 13;       // 光谱数据是缩放的白噪声，不在比特流中编码。
ICStream.INTENSITY_BT2 = 14;  // 缩放因子数据是强度立体位置。
ICStream.INTENSITY_BT = 15;   // 缩放因子数据是强度立体位置。

ICStream.ONLY_LONG_SEQUENCE = 0;
ICStream.LONG_START_SEQUENCE = 1;
ICStream.EIGHT_SHORT_SEQUENCE = 2;
ICStream.LONG_STOP_SEQUENCE = 3;

var MAX_SECTIONS = 120,
      MAX_WINDOW_GROUP_COUNT = 8;

var SF_DELTA = 60,
      SF_OFFSET = 200;

ICStream.prototype = {
    decode: function(stream, config, commonWindow) {
        this.globalGain = stream.read(8);
        
        if (!commonWindow)
            this.info.decode(stream, config, commonWindow);
            
        this.decodeBandTypes(stream, config);
        this.decodeScaleFactors(stream);
        
        if (this.pulsePresent = stream.read(1)) {
            if (this.info.windowSequence === ICStream.EIGHT_SHORT_SEQUENCE)
                throw new Error("Pulse tool not allowed in eight short sequence.");
                
            this.decodePulseData(stream);
        }
        
        if (this.tnsPresent = stream.read(1)) {
            this.tns.decode(stream, this.info);
        }
        
        if (this.gainPresent = stream.read(1)) {
            throw new Error("TODO: decode gain control/SSR");
        }
        
        this.decodeSpectralData(stream);
    },
    
    decodeBandTypes: function(stream, config) {
        var bits = this.info.windowSequence === ICStream.EIGHT_SHORT_SEQUENCE ? 3 : 5,
            groupCount = this.info.groupCount,
            maxSFB = this.info.maxSFB,
            bandTypes = this.bandTypes,
            sectEnd = this.sectEnd,
            idx = 0,
            escape = (1 << bits) - 1;
        
        for (var g = 0; g < groupCount; g++) {
            var k = 0;
            while (k < maxSFB) {
                var end = k,
                    bandType = stream.read(4);
                    
                if (bandType === 12)
                    throw new Error("Invalid band type: 12");
                    
                var incr;
                while ((incr = stream.read(bits)) === escape)
                    end += incr;
                    
                end += incr;
                
                if (end > maxSFB)
                    throw new Error("Too many bands (" + end + " > " + maxSFB + ")");
                    
                for (; k < end; k++) {
                    bandTypes[idx] = bandType;
                    sectEnd[idx++] = end;
                }
            }
        }
    },
    
    decodeScaleFactors: function(stream) {
        var groupCount = this.info.groupCount,
            maxSFB = this.info.maxSFB,
            offset = [this.globalGain, this.globalGain - 90, 0], // spectrum, noise, intensity
            idx = 0,
            noiseFlag = true,
            scaleFactors = this.scaleFactors,
            sectEnd = this.sectEnd,
            bandTypes = this.bandTypes;
                        
        for (var g = 0; g < groupCount; g++) {
            for (var i = 0; i < maxSFB;) {
                var runEnd = sectEnd[idx];
                
                switch (bandTypes[idx]) {
                    case ICStream.ZERO_BT:
                        for (; i < runEnd; i++, idx++) {
                            scaleFactors[idx] = 0;
                        }
                        break;
                        
                    case ICStream.INTENSITY_BT:
                    case ICStream.INTENSITY_BT2:
                        for(; i < runEnd; i++, idx++) {
                            offset[2] += Huffman.decodeScaleFactor(stream) - SF_DELTA;
                            var tmp = Math.min(Math.max(offset[2], -155), 100);
                            scaleFactors[idx] = tables.SCALEFACTOR_TABLE[-tmp + SF_OFFSET];
                        }
                        break;
                        
                    case ICStream.NOISE_BT:
                        for(; i < runEnd; i++, idx++) {
                            if (noiseFlag) {
                                offset[1] += stream.read(9) - 256;
                                noiseFlag = false;
                            } else {
                                offset[1] += Huffman.decodeScaleFactor(stream) - SF_DELTA;
                            }
                            var tmp = Math.min(Math.max(offset[1], -100), 155);
                            scaleFactors[idx] = -tables.SCALEFACTOR_TABLE[tmp + SF_OFFSET];
                        }
                        break;
                        
                    default:
                        for(; i < runEnd; i++, idx++) {
                            offset[0] += Huffman.decodeScaleFactor(stream) - SF_DELTA;
                            if(offset[0] > 255) 
                                throw new Error("Scalefactor out of range: " + offset[0]);
                                
                            scaleFactors[idx] = tables.SCALEFACTOR_TABLE[offset[0] - 100 + SF_OFFSET];
                        }
                        break;
                }
            }
        }
    },
    
    decodePulseData: function(stream) {
        var pulseCount = stream.read(2) + 1,
            pulseSWB = stream.read(6);
            
        if (pulseSWB >= this.info.swbCount)
            throw new Error("Pulse SWB out of range: " + pulseSWB);
            
        if (!this.pulseOffset || this.pulseOffset.length !== pulseCount) {
            // 仅在需要时重新分配
            this.pulseOffset = new Int32Array(pulseCount);
            this.pulseAmp = new Int32Array(pulseCount);
        }
        
        this.pulseOffset[0] = this.info.swbOffsets[pulseSWB] + stream.read(5);
        this.pulseAmp[0] = stream.read(4);
        
        if (this.pulseOffset[0] > 1023)
            throw new Error("Pulse offset out of range: " + this.pulseOffset[0]);
        
        for (var i = 1; i < pulseCount; i++) {
            this.pulseOffset[i] = stream.read(5) + this.pulseOffset[i - 1];
            if (this.pulseOffset[i] > 1023)
                throw new Error("Pulse offset out of range: " + this.pulseOffset[i]);
                
            this.pulseAmp[i] = stream.read(4);
        }
    },
    
    decodeSpectralData: function(stream) {
        var data = this.data,
            info = this.info,
            maxSFB = info.maxSFB,
            windowGroups = info.groupCount,
            offsets = info.swbOffsets,
            bandTypes = this.bandTypes,
            scaleFactors = this.scaleFactors,
            buf = this.specBuf;
            
        var groupOff = 0, idx = 0;
        for (var g = 0; g < windowGroups; g++) {
            var groupLen = info.groupLength[g];
            
            for (var sfb = 0; sfb < maxSFB; sfb++, idx++) {
                var hcb = bandTypes[idx],
                    off = groupOff + offsets[sfb],
                    width = offsets[sfb + 1] - offsets[sfb];
                    
                if (hcb === ICStream.ZERO_BT || hcb === ICStream.INTENSITY_BT || hcb === ICStream.INTENSITY_BT2) {
                    for (var group = 0; group < groupLen; group++, off += 128) {
                        for (var i = off; i < off + width; i++) {
                            data[i] = 0;
                        }
                    }
                } else if (hcb === ICStream.NOISE_BT) {
                    // fill with random values
                    for (var group = 0; group < groupLen; group++, off += 128) {
                        var energy = 0;
                        
                        for (var k = 0; k < width; k++) {
                            this.randomState = (this.randomState * (1664525 + 1013904223))|0;
                            data[off + k] = this.randomState;
                            energy += data[off + k] * data[off + k];
                        }
                        
                        var scale = scaleFactors[idx] / Math.sqrt(energy);
                        for (var k = 0; k < width; k++) {
                            data[off + k] *= scale;
                        }
                    }
                } else {
                    for (var group = 0; group < groupLen; group++, off += 128) {
                        var num = (hcb >= ICStream.FIRST_PAIR_BT) ? 2 : 4;
                        for (var k = 0; k < width; k += num) {
                            Huffman.decodeSpectralData(stream, hcb, buf, 0);
                            
                            // inverse quantization & scaling
                            for (var j = 0; j < num; j++) {
                                data[off + k + j] = (buf[j] > 0) ? tables.IQ_TABLE[buf[j]] : -tables.IQ_TABLE[-buf[j]];
                                data[off + k + j] *= scaleFactors[idx];
                            }
                        }
                    }
                }
            }
            groupOff += groupLen << 7;
        }
        
        // 添加脉冲数据（如果存在）
        if (this.pulsePresent) {
            throw new Error('TODO: add pulse data');
        }
    }
}

// 个别频道流信息
function ICSInfo() {
    this.windowShape = new Int32Array(2);
    this.windowSequence = ICStream.ONLY_LONG_SEQUENCE;
    this.groupLength = new Int32Array(MAX_WINDOW_GROUP_COUNT);
    this.ltpData1Present = false;
    this.ltpData2Present = false;
}

ICSInfo.prototype = {
    decode: function(stream, config, commonWindow) {
        stream.advance(1); // 保留
        
        this.windowSequence = stream.read(2);
        this.windowShape[0] = this.windowShape[1];
        this.windowShape[1] = stream.read(1);
        
        this.groupCount = 1;
        this.groupLength[0] = 1;
        
        if (this.windowSequence === ICStream.EIGHT_SHORT_SEQUENCE) {
            this.maxSFB = stream.read(4);
            for (var i = 0; i < 7; i++) {
                if (stream.read(1)) {
                    this.groupLength[this.groupCount - 1]++;
                } else {
                    this.groupCount++;
                    this.groupLength[this.groupCount - 1] = 1;
                }
            }
            
            this.windowCount = 8;
            this.swbOffsets = tables.SWB_OFFSET_128[config.sampleIndex];
            this.swbCount = tables.SWB_SHORT_WINDOW_COUNT[config.sampleIndex];
            this.predictorPresent = false;
        } else {
            this.maxSFB = stream.read(6);
            this.windowCount = 1;
            this.swbOffsets = tables.SWB_OFFSET_1024[config.sampleIndex];
            this.swbCount = tables.SWB_LONG_WINDOW_COUNT[config.sampleIndex];
            this.predictorPresent = !!stream.read(1);
            
            if (this.predictorPresent)
                this.decodePrediction(stream, config, commonWindow);
        }
    },
    
    decodePrediction: function(stream, config, commonWindow) {
        throw new Error('Prediction not implemented.');
        
        switch (config.profile) {
            case AOT_AAC_MAIN:
                throw new Error('Prediction not implemented.');
                break;
                
            case AOT_AAC_LTP:
                throw new Error('LTP prediction not implemented.');
                break;
                
            default:
                throw new Error('Unsupported profile for prediction ' + config.profile);
        }
    }
};

module.exports = ICStream;

},{"./huffman":7,"./tables":11,"./tns":12}],9:[function(require,module,exports){

var tables = require('./mdct_tables');
var FFT = require('./fft');

// 修正离散余弦变换   ===  不懂的，可以理解 成 画质的比例吧
function MDCT(length) {
    this.N = length;
    this.N2 = length >>> 1;
    this.N4 = length >>> 2;
    this.N8 = length >>> 3;
    
    switch (length) {
        case 2048:
            this.sincos = tables.MDCT_TABLE_2048;
            break;
            
        case 256:
            this.sincos = tables.MDCT_TABLE_256;
            break;
            
        case 1920:
            this.sincos = tables.MDCT_TABLE_1920;
            break;
            
        case 240:
            this.sincos = tables.MDCT_TABLE_240;
            break;
            
        default:
            throw new Error("unsupported MDCT length: " + length);
    }
    
    this.fft = new FFT(this.N4);
    
    this.buf = new Array(this.N4);
    for (var i = 0; i < this.N4; i++) {
        this.buf[i] = new Float32Array(2);
    }
    
    this.tmp = new Float32Array(2);
}

MDCT.prototype.process = function(input, inOffset, output, outOffset) {
    // 本地访问
    var N2 = this.N2,
        N4 = this.N4,
        N8 = this.N8,
        buf = this.buf,
        tmp = this.tmp,
        sincos = this.sincos,
        fft = this.fft;
    
    // 预IFFT复数乘法 TDDE
    for (var k = 0; k < N4; k++) {
        buf[k][1] = (input[inOffset + 2 * k] * sincos[k][0]) + (input[inOffset + N2 - 1 - 2 * k] * sincos[k][1]);
        buf[k][0] = (input[inOffset + N2 - 1 - 2 * k] * sincos[k][0]) - (input[inOffset + 2 * k] * sincos[k][1]);
    }
    
    // 复杂IFFT，非标度
    fft.process(buf, false);
    
    // 后IFFT复数乘法
    for (var k = 0; k < N4; k++) {
        tmp[0] = buf[k][0];
        tmp[1] = buf[k][1];
        buf[k][1] = (tmp[1] * sincos[k][0]) + (tmp[0] * sincos[k][1]);
        buf[k][0] = (tmp[0] * sincos[k][0]) - (tmp[1] * sincos[k][1]);
    }
    
    // 重新排序
    for (var k = 0; k < N8; k += 2) {
        output[outOffset + 2 * k] = buf[N8 + k][1];
        output[outOffset + 2 + 2 * k] = buf[N8 + 1 + k][1];

        output[outOffset + 1 + 2 * k] = -buf[N8 - 1 - k][0];
        output[outOffset + 3 + 2 * k] = -buf[N8 - 2 - k][0];

        output[outOffset + N4 + 2 * k] = buf[k][0];
        output[outOffset + N4 + 2 + 2 * k] = buf[1 + k][0];

        output[outOffset + N4 + 1 + 2 * k] = -buf[N4 - 1 - k][1];
        output[outOffset + N4 + 3 + 2 * k] = -buf[N4 - 2 - k][1];

        output[outOffset + N2 + 2 * k] = buf[N8 + k][0];
        output[outOffset + N2 + 2 + 2 * k] = buf[N8 + 1 + k][0];

        output[outOffset + N2 + 1 + 2 * k] = -buf[N8 - 1 - k][1];
        output[outOffset + N2 + 3 + 2 * k] = -buf[N8 - 2 - k][1];

        output[outOffset + N2 + N4 + 2 * k] = -buf[k][1];
        output[outOffset + N2 + N4 + 2 + 2 * k] = -buf[1 + k][1];

        output[outOffset + N2 + N4 + 1 + 2 * k] = buf[N4 - 1 - k][0];
        output[outOffset + N2 + N4 + 3 + 2 * k] = buf[N4 - 2 - k][0];
    }
};

module.exports = MDCT;

},{"./fft":5,"./mdct_tables":10}],10:[function(require,module,exports){

exports.MDCT_TABLE_2048 = [
    [0.031249997702054, 0.000011984224612],
    [0.031249813866531, 0.000107857810004],
    [0.031249335895858, 0.000203730380198],
    [0.031248563794535, 0.000299601032804],
    [0.031247497569829, 0.000395468865451],
    [0.031246137231775, 0.000491332975794],
    [0.031244482793177, 0.000587192461525],
    [0.031242534269608, 0.000683046420376],
    [0.031240291679407, 0.000778893950134],
    [0.031237755043684, 0.000874734148645],
    [0.031234924386313, 0.000970566113826],
    [0.031231799733938, 0.001066388943669],
    [0.031228381115970, 0.001162201736253],
    [0.031224668564585, 0.001258003589751],
    [0.031220662114728, 0.001353793602441],
    [0.031216361804108, 0.001449570872710],
    [0.031211767673203, 0.001545334499065],
    [0.031206879765253, 0.001641083580144],
    [0.031201698126266, 0.001736817214719],
    [0.031196222805014, 0.001832534501709],
    [0.031190453853031, 0.001928234540186],
    [0.031184391324617, 0.002023916429386],
    [0.031178035276836, 0.002119579268713],
    [0.031171385769513, 0.002215222157753],
    [0.031164442865236, 0.002310844196278],
    [0.031157206629353, 0.002406444484258],
    [0.031149677129975, 0.002502022121865],
    [0.031141854437973, 0.002597576209488],
    [0.031133738626977, 0.002693105847734],
    [0.031125329773375, 0.002788610137442],
    [0.031116627956316, 0.002884088179689],
    [0.031107633257703, 0.002979539075801],
    [0.031098345762200, 0.003074961927355],
    [0.031088765557222, 0.003170355836197],
    [0.031078892732942, 0.003265719904442],
    [0.031068727382288, 0.003361053234488],
    [0.031058269600939, 0.003456354929021],
    [0.031047519487329, 0.003551624091024],
    [0.031036477142640, 0.003646859823790],
    [0.031025142670809, 0.003742061230921],
    [0.031013516178519, 0.003837227416347],
    [0.031001597775203, 0.003932357484328],
    [0.030989387573042, 0.004027450539462],
    [0.030976885686963, 0.004122505686697],
    [0.030964092234638, 0.004217522031340],
    [0.030951007336485, 0.004312498679058],
    [0.030937631115663, 0.004407434735897],
    [0.030923963698074, 0.004502329308281],
    [0.030910005212362, 0.004597181503027],
    [0.030895755789908, 0.004691990427350],
    [0.030881215564835, 0.004786755188872],
    [0.030866384674000, 0.004881474895632],
    [0.030851263256996, 0.004976148656090],
    [0.030835851456154, 0.005070775579142],
    [0.030820149416533, 0.005165354774124],
    [0.030804157285929, 0.005259885350819],
    [0.030787875214864, 0.005354366419469],
    [0.030771303356593, 0.005448797090784],
    [0.030754441867095, 0.005543176475946],
    [0.030737290905077, 0.005637503686619],
    [0.030719850631972, 0.005731777834961],
    [0.030702121211932, 0.005825998033626],
    [0.030684102811835, 0.005920163395780],
    [0.030665795601276, 0.006014273035101],
    [0.030647199752570, 0.006108326065793],
    [0.030628315440748, 0.006202321602594],
    [0.030609142843557, 0.006296258760782],
    [0.030589682141455, 0.006390136656185],
    [0.030569933517616, 0.006483954405188],
    [0.030549897157919, 0.006577711124743],
    [0.030529573250956, 0.006671405932375],
    [0.030508961988022, 0.006765037946194],
    [0.030488063563118, 0.006858606284900],
    [0.030466878172949, 0.006952110067791],
    [0.030445406016919, 0.007045548414774],
    [0.030423647297133, 0.007138920446372],
    [0.030401602218392, 0.007232225283733],
    [0.030379270988192, 0.007325462048634],
    [0.030356653816724, 0.007418629863497],
    [0.030333750916869, 0.007511727851390],
    [0.030310562504198, 0.007604755136040],
    [0.030287088796968, 0.007697710841838],
    [0.030263330016124, 0.007790594093851],
    [0.030239286385293, 0.007883404017824],
    [0.030214958130781, 0.007976139740197],
    [0.030190345481576, 0.008068800388104],
    [0.030165448669342, 0.008161385089390],
    [0.030140267928416, 0.008253892972610],
    [0.030114803495809, 0.008346323167047],
    [0.030089055611203, 0.008438674802711],
    [0.030063024516947, 0.008530947010354],
    [0.030036710458054, 0.008623138921475],
    [0.030010113682202, 0.008715249668328],
    [0.029983234439732, 0.008807278383932],
    [0.029956072983640, 0.008899224202078],
    [0.029928629569580, 0.008991086257336],
    [0.029900904455860, 0.009082863685067],
    [0.029872897903441, 0.009174555621425],
    [0.029844610175929, 0.009266161203371],
    [0.029816041539579, 0.009357679568679],
    [0.029787192263292, 0.009449109855944],
    [0.029758062618606, 0.009540451204587],
    [0.029728652879702, 0.009631702754871],
    [0.029698963323395, 0.009722863647900],
    [0.029668994229134, 0.009813933025633],
    [0.029638745879000, 0.009904910030891],
    [0.029608218557702, 0.009995793807363],
    [0.029577412552575, 0.010086583499618],
    [0.029546328153577, 0.010177278253107],
    [0.029514965653285, 0.010267877214177],
    [0.029483325346896, 0.010358379530076],
    [0.029451407532220, 0.010448784348962],
    [0.029419212509679, 0.010539090819911],
    [0.029386740582307, 0.010629298092923],
    [0.029353992055740, 0.010719405318933],
    [0.029320967238220, 0.010809411649818],
    [0.029287666440590, 0.010899316238403],
    [0.029254089976290, 0.010989118238474],
    [0.029220238161353, 0.011078816804778],
    [0.029186111314406, 0.011168411093039],
    [0.029151709756664, 0.011257900259961],
    [0.029117033811927, 0.011347283463239],
    [0.029082083806579, 0.011436559861563],
    [0.029046860069582, 0.011525728614630],
    [0.029011362932476, 0.011614788883150],
    [0.028975592729373, 0.011703739828853],
    [0.028939549796957, 0.011792580614500],
    [0.028903234474475, 0.011881310403886],
    [0.028866647103744, 0.011969928361855],
    [0.028829788029135, 0.012058433654299],
    [0.028792657597583, 0.012146825448172],
    [0.028755256158571, 0.012235102911499],
    [0.028717584064137, 0.012323265213377],
    [0.028679641668864, 0.012411311523990],
    [0.028641429329882, 0.012499241014612],
    [0.028602947406859, 0.012587052857618],
    [0.028564196262001, 0.012674746226488],
    [0.028525176260050, 0.012762320295819],
    [0.028485887768276, 0.012849774241331],
    [0.028446331156478, 0.012937107239875],
    [0.028406506796976, 0.013024318469437],
    [0.028366415064615, 0.013111407109155],
    [0.028326056336751, 0.013198372339315],
    [0.028285430993258, 0.013285213341368],
    [0.028244539416515, 0.013371929297933],
    [0.028203381991411, 0.013458519392807],
    [0.028161959105334, 0.013544982810971],
    [0.028120271148172, 0.013631318738598],
    [0.028078318512309, 0.013717526363062],
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    [0.000083889473581, 0.031249887400697]
];

exports.MDCT_TABLE_256 = [
    [0.088387931675923, 0.000271171628935],
    [0.088354655998507, 0.002440238387037],
    [0.088268158780110, 0.004607835236780],
    [0.088128492123423, 0.006772656498875],
    [0.087935740158418, 0.008933398165942],
    [0.087690018991670, 0.011088758687994],
    [0.087391476636423, 0.013237439756448],
    [0.087040292923427, 0.015378147086172],
    [0.086636679392621, 0.017509591195118],
    [0.086180879165703, 0.019630488181053],
    [0.085673166799686, 0.021739560494940],
    [0.085113848121515, 0.023835537710479],
    [0.084503260043847, 0.025917157289369],
    [0.083841770362110, 0.027983165341813],
    [0.083129777532952, 0.030032317381813],
    [0.082367710434230, 0.032063379076803],
    [0.081556028106671, 0.034075126991164],
    [0.080695219477356, 0.036066349323177],
    [0.079785803065216, 0.038035846634965],
    [0.078828326668693, 0.039982432574992],
    [0.077823367035766, 0.041904934592675],
    [0.076771529516540, 0.043802194644686],
    [0.075673447698606, 0.045673069892513],
    [0.074529783025390, 0.047516433390863],
    [0.073341224397728, 0.049331174766491],
    [0.072108487758894, 0.051116200887052],
    [0.070832315663343, 0.052870436519557],
    [0.069513476829429, 0.054592824978055],
    [0.068152765676348, 0.056282328760143],
    [0.066751001845620, 0.057937930171918],
    [0.065309029707361, 0.059558631940996],
    [0.063827717851668, 0.061143457817234],
    [0.062307958565413, 0.062691453160784],
    [0.060750667294763, 0.064201685517134],
    [0.059156782093749, 0.065673245178784],
    [0.057527263059216, 0.067105245733220],
    [0.055863091752499, 0.068496824596852],
    [0.054165270608165, 0.069847143534609],
    [0.052434822330188, 0.071155389164853],
    [0.050672789275903, 0.072420773449336],
    [0.048880232828135, 0.073642534167879],
    [0.047058232755862, 0.074819935377512],
    [0.045207886563797, 0.075952267855771],
    [0.043330308831298, 0.077038849527912],
    [0.041426630540984, 0.078079025877766],
    [0.039497998397473, 0.079072170341994],
    [0.037545574136653, 0.080017684687506],
    [0.035570533825892, 0.080914999371817],
    [0.033574067155622, 0.081763573886112],
    [0.031557376722714, 0.082562897080836],
    [0.029521677306074, 0.083312487473584],
    [0.027468195134911, 0.084011893539132],
    [0.025398167150101, 0.084660693981419],
    [0.023312840259098, 0.085258497987320],
    [0.021213470584847, 0.085804945462053],
    [0.019101322709138, 0.086299707246093],
    [0.016977668910873, 0.086742485313442],
    [0.014843788399692, 0.087133012951149],
    [0.012700966545425, 0.087471054919968],
    [0.010550494103830, 0.087756407596056],
    [0.008393666439096, 0.087988899093631],
    [0.006231782743558, 0.088168389368510],
    [0.004066145255116, 0.088294770302461],
    [0.001898058472816, 0.088367965768336]
];                                      

exports.MDCT_TABLE_1920 = [             
    [0.032274858518097, 0.000013202404176],
    [0.032274642494505, 0.000118821372483],
    [0.032274080835421, 0.000224439068308],
    [0.032273173546860, 0.000330054360572],
    [0.032271920638538, 0.000435666118218],
    [0.032270322123873, 0.000541273210231],
    [0.032268378019984, 0.000646874505642],
    [0.032266088347691, 0.000752468873546],
    [0.032263453131514, 0.000858055183114],
    [0.032260472399674, 0.000963632303600],
    [0.032257146184092, 0.001069199104358],
    [0.032253474520390, 0.001174754454853],
    [0.032249457447888, 0.001280297224671],
    [0.032245095009606, 0.001385826283535],
    [0.032240387252262, 0.001491340501313],
    [0.032235334226272, 0.001596838748031],
    [0.032229935985750, 0.001702319893890],
    [0.032224192588507, 0.001807782809271],
    [0.032218104096050, 0.001913226364749],
    [0.032211670573582, 0.002018649431111],
    [0.032204892090000, 0.002124050879359],
    [0.032197768717898, 0.002229429580728],
    [0.032190300533560, 0.002334784406698],
    [0.032182487616965, 0.002440114229003],
    [0.032174330051782, 0.002545417919644],
    [0.032165827925374, 0.002650694350905],
    [0.032156981328790, 0.002755942395358],
    [0.032147790356771, 0.002861160925883],
    [0.032138255107744, 0.002966348815672],
    [0.032128375683825, 0.003071504938250],
    [0.032118152190814, 0.003176628167476],
    [0.032107584738196, 0.003281717377568],
    [0.032096673439141, 0.003386771443102],
    [0.032085418410500, 0.003491789239036],
    [0.032073819772804, 0.003596769640711],
    [0.032061877650267, 0.003701711523874],
    [0.032049592170778, 0.003806613764680],
    [0.032036963465906, 0.003911475239711],
    [0.032023991670893, 0.004016294825985],
    [0.032010676924657, 0.004121071400967],
    [0.031997019369789, 0.004225803842586],
    [0.031983019152549, 0.004330491029241],
    [0.031968676422869, 0.004435131839816],
    [0.031953991334348, 0.004539725153692],
    [0.031938964044252, 0.004644269850758],
    [0.031923594713510, 0.004748764811426],
    [0.031907883506716, 0.004853208916638],
    [0.031891830592124, 0.004957601047881],
    [0.031875436141648, 0.005061940087200],
    [0.031858700330859, 0.005166224917208],
    [0.031841623338985, 0.005270454421097],
    [0.031824205348907, 0.005374627482653],
    [0.031806446547156, 0.005478742986267],
    [0.031788347123916, 0.005582799816945],
    [0.031769907273017, 0.005686796860323],
    [0.031751127191935, 0.005790733002674],
    [0.031732007081789, 0.005894607130928],
    [0.031712547147340, 0.005998418132675],
    [0.031692747596989, 0.006102164896182],
    [0.031672608642773, 0.006205846310406],
    [0.031652130500364, 0.006309461265002],
    [0.031631313389067, 0.006413008650337],
    [0.031610157531816, 0.006516487357501],
    [0.031588663155172, 0.006619896278321],
    [0.031566830489325, 0.006723234305370],
    [0.031544659768083, 0.006826500331981],
    [0.031522151228878, 0.006929693252258],
    [0.031499305112758, 0.007032811961088],
    [0.031476121664387, 0.007135855354151],
    [0.031452601132040, 0.007238822327937],
    [0.031428743767604, 0.007341711779751],
    [0.031404549826572, 0.007444522607730],
    [0.031380019568042, 0.007547253710853],
    [0.031355153254712, 0.007649903988952],
    [0.031329951152882, 0.007752472342725],
    [0.031304413532445, 0.007854957673748],
    [0.031278540666888, 0.007957358884484],
    [0.031252332833290, 0.008059674878300],
    [0.031225790312316, 0.008161904559473],
    [0.031198913388214, 0.008264046833205],
    [0.031171702348814, 0.008366100605636],
    [0.031144157485525, 0.008468064783849],
    [0.031116279093331, 0.008569938275893],
    [0.031088067470786, 0.008671719990782],
    [0.031059522920014, 0.008773408838517],
    [0.031030645746705, 0.008875003730092],
    [0.031001436260110, 0.008976503577507],
    [0.030971894773039, 0.009077907293780],
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    [0.030911817066483, 0.009280421990133],
    [0.030881281490382, 0.009381530801444],
    [0.030850415200566, 0.009482539144097],
    [0.030819218527589, 0.009583445936373],
    [0.030787691805541, 0.009684250097643],
    [0.030755835372048, 0.009784950548375],
    [0.030723649568268, 0.009885546210147],
    [0.030691134738883, 0.009986036005661],
    [0.030658291232103, 0.010086418858753],
    [0.030625119399655, 0.010186693694402],
    [0.030591619596781, 0.010286859438745],
    [0.030557792182239, 0.010386915019088],
    [0.030523637518292, 0.010486859363916],
    [0.030489155970710, 0.010586691402906],
    [0.030454347908763, 0.010686410066936],
    [0.030419213705216, 0.010786014288099],
    [0.030383753736329, 0.010885502999714],
    [0.030347968381849, 0.010984875136338],
    [0.030311858025010, 0.011084129633775],
    [0.030275423052523, 0.011183265429088],
    [0.030238663854579, 0.011282281460612],
    [0.030201580824838, 0.011381176667967],
    [0.030164174360430, 0.011479949992062],
    [0.030126444861948, 0.011578600375117],
    [0.030088392733446, 0.011677126760663],
    [0.030050018382430, 0.011775528093563],
    [0.030011322219859, 0.011873803320018],
    [0.029972304660138, 0.011971951387578],
    [0.029932966121114, 0.012069971245157],
    [0.029893307024070, 0.012167861843041],
    [0.029853327793724, 0.012265622132901],
    [0.029813028858222, 0.012363251067801],
    [0.029772410649132, 0.012460747602215],
    [0.029731473601443, 0.012558110692033],
    [0.029690218153558, 0.012655339294575],
    [0.029648644747289, 0.012752432368600],
    [0.029606753827855, 0.012849388874320],
    [0.029564545843872, 0.012946207773407],
    [0.029522021247356, 0.013042888029011],
    [0.029479180493710, 0.013139428605762],
    [0.029436024041725, 0.013235828469789],
    [0.029392552353570, 0.013332086588727],
    [0.029348765894794, 0.013428201931728],
    [0.029304665134313, 0.013524173469475],
    [0.029260250544412, 0.013620000174189],
    [0.029215522600735, 0.013715681019643],
    [0.029170481782283, 0.013811214981173],
    [0.029125128571406, 0.013906601035686],
    [0.029079463453801, 0.014001838161674],
    [0.029033486918505, 0.014096925339225],
    [0.028987199457889, 0.014191861550031],
    [0.028940601567655, 0.014286645777401],
    [0.028893693746829, 0.014381277006273],
    [0.028846476497755, 0.014475754223221],
    [0.028798950326094, 0.014570076416472],
    [0.028751115740811, 0.014664242575910],
    [0.028702973254178, 0.014758251693091],
    [0.028654523381760, 0.014852102761253],
    [0.028605766642418, 0.014945794775326],
    [0.028556703558297, 0.015039326731945],
    [0.028507334654823, 0.015132697629457],
    [0.028457660460698, 0.015225906467935],
    [0.028407681507891, 0.015318952249187],
    [0.028357398331639, 0.015411833976768],
    [0.028306811470432, 0.015504550655988],
    [0.028255921466016, 0.015597101293927],
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    [0.027891249612061, 0.016240223574335],
    [0.027837954353113, 0.016331410352467],
    [0.027784360972039, 0.016422422234315],
    [0.027730470042780, 0.016513258245214],
    [0.027676282142466, 0.016603917412384],
    [0.027621797851405, 0.016694398764938],
    [0.027567017753080, 0.016784701333894],
    [0.027511942434143, 0.016874824152183],
    [0.027456572484404, 0.016964766254662],
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    [0.027344951067546, 0.017144104461307],
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    [0.027232158283994, 0.017322708271577],
    [0.027175324137651, 0.017411732385960],
    [0.027118198965418, 0.017500570034678],
    [0.027060783379060, 0.017589220266351],
    [0.027003077993454, 0.017677682131607],
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    [0.026886800299502, 0.017854036975468],
    [0.026828229236397, 0.017941928065456],
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    [0.026710225814170, 0.018117132875340],
    [0.026650794718768, 0.018204444718934],
    [0.026591078214767, 0.018291561607551],
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    [0.026470791542075, 0.018465206790142],
    [0.026410222661558, 0.018551733224515],
    [0.026349370948775, 0.018638060984730],
    [0.026288237055398, 0.018724189146286],
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    [0.026040892815028, 0.019066687390916],
    [0.025978357899296, 0.019151803766819],
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    [0.025852454118485, 0.019321420307998],
    [0.025789086601733, 0.019405918656817],
    [0.025725442904582, 0.019490209183837],
    [0.025661523708606, 0.019574290986376],
    [0.025597329698327, 0.019658163163984],
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    [0.025468119987662, 0.019825275053848],
    [0.025403105671008, 0.019908512976470],
    [0.025337819307501, 0.019991537694913],
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    [0.025007331359476, 0.020403432185395],
    [0.024940427498748, 0.020485159087650],
    [0.024873256546079, 0.020566666610309],
    [0.024805819220816, 0.020647953880491],
    [0.024738116245157, 0.020729020027676],
    [0.024670148344147, 0.020809864183709],
    [0.024601916245669, 0.020890485482816],
    [0.024533420680433, 0.020970883061607],
    [0.024464662381971, 0.021051056059087],
    [0.024395642086630, 0.021131003616670],
    [0.024326360533561, 0.021210724878181],
    [0.024256818464715, 0.021290218989868],
    [0.024187016624830, 0.021369485100415],
    [0.024116955761430, 0.021448522360944],
    [0.024046636624808, 0.021527329925030],
    [0.023976059968027, 0.021605906948708],
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    [0.023834137120014, 0.021762366011328],
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    [0.023329407263659, 0.022302587818300],
    [0.023256297426359, 0.022378813567377],
    [0.023182938532797, 0.022454799657339],
    [0.023109331368588, 0.022530545274437],
    [0.023035476722006, 0.022606049607496],
    [0.022961375383975, 0.022681311847926],
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    [0.020708774268678, 0.024755066854194],
    [0.020627652759262, 0.024822703485116],
    [0.020546310344257, 0.024890074284826],
    [0.020464747894775, 0.024957178531837],
    [0.020382966284284, 0.025024015507516],
    [0.020300966388600, 0.025090584496093],
    [0.020218749085876, 0.025156884784668],
    [0.020136315256592, 0.025222915663218],
    [0.020053665783549, 0.025288676424605],
    [0.019970801551857, 0.025354166364584],
    [0.019887723448925, 0.025419384781811],
    [0.019804432364452, 0.025484330977848],
    [0.019720929190419, 0.025549004257175],
    [0.019637214821078, 0.025613403927192],
    [0.019553290152943, 0.025677529298230],
    [0.019469156084779, 0.025741379683559],
    [0.019384813517595, 0.025804954399392],
    [0.019300263354632, 0.025868252764895],
    [0.019215506501354, 0.025931274102193],
    [0.019130543865439, 0.025994017736379],
    [0.019045376356769, 0.026056482995518],
    [0.018960004887419, 0.026118669210657],
    [0.018874430371648, 0.026180575715833],
    [0.018788653725892, 0.026242201848076],
    [0.018702675868750, 0.026303546947421],
    [0.018616497720974, 0.026364610356909],
    [0.018530120205464, 0.026425391422602],
    [0.018443544247254, 0.026485889493583],
    [0.018356770773502, 0.026546103921965],
    [0.018269800713483, 0.026606034062902],
    [0.018182634998576, 0.026665679274589],
    [0.018095274562256, 0.026725038918274],
    [0.018007720340083, 0.026784112358263],
    [0.017919973269692, 0.026842898961926],
    [0.017832034290785, 0.026901398099707],
    [0.017743904345116, 0.026959609145127],
    [0.017655584376488, 0.027017531474792],
    [0.017567075330734, 0.027075164468401],
    [0.017478378155718, 0.027132507508750],
    [0.017389493801313, 0.027189559981742],
    [0.017300423219401, 0.027246321276391],
    [0.017211167363854, 0.027302790784828],
    [0.017121727190533, 0.027358967902310],
    [0.017032103657269, 0.027414852027226],
    [0.016942297723858, 0.027470442561102],
    [0.016852310352050, 0.027525738908608],
    [0.016762142505537, 0.027580740477564],
    [0.016671795149944, 0.027635446678948],
    [0.016581269252819, 0.027689856926900],
    [0.016490565783622, 0.027743970638730],
    [0.016399685713714, 0.027797787234924],
    [0.016308630016347, 0.027851306139149],
    [0.016217399666655, 0.027904526778260],
    [0.016125995641641, 0.027957448582309],
    [0.016034418920170, 0.028010070984544],
    [0.015942670482954, 0.028062393421421],
    [0.015850751312545, 0.028114415332610],
    [0.015758662393324, 0.028166136160998],
    [0.015666404711489, 0.028217555352697],
    [0.015573979255046, 0.028268672357047],
    [0.015481387013797, 0.028319486626627],
    [0.015388628979331, 0.028369997617257],
    [0.015295706145012, 0.028420204788004],
    [0.015202619505968, 0.028470107601191],
    [0.015109370059084, 0.028519705522399],
    [0.015015958802984, 0.028568998020472],
    [0.014922386738030, 0.028617984567529],
    [0.014828654866302, 0.028666664638963],
    [0.014734764191593, 0.028715037713449],
    [0.014640715719398, 0.028763103272951],
    [0.014546510456900, 0.028810860802724],
    [0.014452149412962, 0.028858309791325],
    [0.014357633598114, 0.028905449730613],
    [0.014262964024545, 0.028952280115756],
    [0.014168141706090, 0.028998800445240],
    [0.014073167658220, 0.029045010220868],
    [0.013978042898030, 0.029090908947771],
    [0.013882768444231, 0.029136496134411],
    [0.013787345317136, 0.029181771292585],
    [0.013691774538648, 0.029226733937433],
    [0.013596057132255, 0.029271383587441],
    [0.013500194123014, 0.029315719764447],
    [0.013404186537539, 0.029359741993647],
    [0.013308035403995, 0.029403449803598],
    [0.013211741752084, 0.029446842726223],
    [0.013115306613032, 0.029489920296820],
    [0.013018731019584, 0.029532682054063],
    [0.012922016005985, 0.029575127540008],
    [0.012825162607977, 0.029617256300097],
    [0.012728171862781, 0.029659067883165],
    [0.012631044809089, 0.029700561841444],
    [0.012533782487056, 0.029741737730567],
    [0.012436385938281, 0.029782595109573],
    [0.012338856205805, 0.029823133540913],
    [0.012241194334091, 0.029863352590452],
    [0.012143401369021, 0.029903251827477],
    [0.012045478357878, 0.029942830824699],
    [0.011947426349339, 0.029982089158259],
    [0.011849246393462, 0.030021026407731],
    [0.011750939541676, 0.030059642156129],
    [0.011652506846768, 0.030097935989909],
    [0.011553949362874, 0.030135907498976],
    [0.011455268145464, 0.030173556276684],
    [0.011356464251335, 0.030210881919845],
    [0.011257538738598, 0.030247884028732],
    [0.011158492666665, 0.030284562207083],
    [0.011059327096240, 0.030320916062102],
    [0.010960043089307, 0.030356945204470],
    [0.010860641709118, 0.030392649248343],
    [0.010761124020182, 0.030428027811361],
    [0.010661491088253, 0.030463080514646],
    [0.010561743980319, 0.030497806982812],
    [0.010461883764593, 0.030532206843968],
    [0.010361911510496, 0.030566279729717],
    [0.010261828288652, 0.030600025275167],
    [0.010161635170872, 0.030633443118931],
    [0.010061333230142, 0.030666532903129],
    [0.009960923540617, 0.030699294273397],
    [0.009860407177603, 0.030731726878888],
    [0.009759785217550, 0.030763830372273],
    [0.009659058738038, 0.030795604409750],
    [0.009558228817767, 0.030827048651045],
    [0.009457296536545, 0.030858162759415],
    [0.009356262975275, 0.030888946401653],
    [0.009255129215945, 0.030919399248091],
    [0.009153896341616, 0.030949520972603],
    [0.009052565436412, 0.030979311252611],
    [0.008951137585505, 0.031008769769084],
    [0.008849613875105, 0.031037896206544],
    [0.008747995392451, 0.031066690253072],
    [0.008646283225794, 0.031095151600306],
    [0.008544478464390, 0.031123279943448],
    [0.008442582198486, 0.031151074981266],
    [0.008340595519310, 0.031178536416098],
    [0.008238519519057, 0.031205663953853],
    [0.008136355290878, 0.031232457304017],
    [0.008034103928871, 0.031258916179656],
    [0.007931766528065, 0.031285040297416],
    [0.007829344184412, 0.031310829377528],
    [0.007726837994772, 0.031336283143813],
    [0.007624249056906, 0.031361401323680],
    [0.007521578469457, 0.031386183648135],
    [0.007418827331946, 0.031410629851778],
    [0.007315996744755, 0.031434739672811],
    [0.007213087809115, 0.031458512853036],
    [0.007110101627101, 0.031481949137863],
    [0.007007039301610, 0.031505048276306],
    [0.006903901936357, 0.031527810020993],
    [0.006800690635862, 0.031550234128164],
    [0.006697406505433, 0.031572320357675],
    [0.006594050651161, 0.031594068473000],
    [0.006490624179905, 0.031615478241233],
    [0.006387128199278, 0.031636549433095],
    [0.006283563817639, 0.031657281822929],
    [0.006179932144080, 0.031677675188707],
    [0.006076234288412, 0.031697729312034],
    [0.005972471361157, 0.031717443978146],
    [0.005868644473532, 0.031736818975914],
    [0.005764754737440, 0.031755854097848],
    [0.005660803265456, 0.031774549140098],
    [0.005556791170816, 0.031792903902453],
    [0.005452719567407, 0.031810918188350],
    [0.005348589569753, 0.031828591804869],
    [0.005244402293001, 0.031845924562742],
    [0.005140158852914, 0.031862916276347],
    [0.005035860365855, 0.031879566763717],
    [0.004931507948778, 0.031895875846539],
    [0.004827102719212, 0.031911843350155],
    [0.004722645795254, 0.031927469103567],
    [0.004618138295554, 0.031942752939435],
    [0.004513581339303, 0.031957694694082],
    [0.004408976046222, 0.031972294207493],
    [0.004304323536549, 0.031986551323320],
    [0.004199624931030, 0.032000465888879],
    [0.004094881350902, 0.032014037755158],
    [0.003990093917884, 0.032027266776813],
    [0.003885263754166, 0.032040152812170],
    [0.003780391982394, 0.032052695723232],
    [0.003675479725661, 0.032064895375674],
    [0.003570528107494, 0.032076751638847],
    [0.003465538251839, 0.032088264385780],
    [0.003360511283053, 0.032099433493181],
    [0.003255448325892, 0.032110258841438],
    [0.003150350505494, 0.032120740314619],
    [0.003045218947373, 0.032130877800478],
    [0.002940054777404, 0.032140671190449],
    [0.002834859121810, 0.032150120379653],
    [0.002729633107153, 0.032159225266897],
    [0.002624377860318, 0.032167985754674],
    [0.002519094508504, 0.032176401749168],
    [0.002413784179212, 0.032184473160250],
    [0.002308448000231, 0.032192199901481],
    [0.002203087099626, 0.032199581890114],
    [0.002097702605728, 0.032206619047093],
    [0.001992295647121, 0.032213311297057],
    [0.001886867352628, 0.032219658568338],
    [0.001781418851302, 0.032225660792960],
    [0.001675951272410, 0.032231317906644],
    [0.001570465745428, 0.032236629848809],
    [0.001464963400018, 0.032241596562566],
    [0.001359445366028, 0.032246217994727],
    [0.001253912773470, 0.032250494095799],
    [0.001148366752513, 0.032254424819990],
    [0.001042808433471, 0.032258010125204],
    [0.000937238946789, 0.032261249973045],
    [0.000831659423030, 0.032264144328817],
    [0.000726070992868, 0.032266693161525],
    [0.000620474787068, 0.032268896443871],
    [0.000514871936481, 0.032270754152261],
    [0.000409263572030, 0.032272266266801],
    [0.000303650824695, 0.032273432771295],
    [0.000198034825504, 0.032274253653254],
    [0.000092416705518, 0.032274728903884]
];

exports.MDCT_TABLE_240 = [              
    [0.091286604111815, 0.000298735779793],
    [0.091247502481454, 0.002688238127538],
    [0.091145864370807, 0.005075898091152],
    [0.090981759437558, 0.007460079287760],
    [0.090755300151030, 0.009839147718664],
    [0.090466641715108, 0.012211472889198],
    [0.090115981961863, 0.014575428926191],
    [0.089703561215976, 0.016929395692256],
    [0.089229662130024, 0.019271759896156],
    [0.088694609490769, 0.021600916198470],
    [0.088098769996564, 0.023915268311810],
    [0.087442552006035, 0.026213230094844],
    [0.086726405258214, 0.028493226639351],
    [0.085950820564309, 0.030753695349588],
    [0.085116329471329, 0.032993087013213],
    [0.084223503897785, 0.035209866863042],
    [0.083272955741727, 0.037402515628894],
    [0.082265336461381, 0.039569530578832],
    [0.081201336628670, 0.041709426549053],
    [0.080081685455930, 0.043820736961749],
    [0.078907150296148, 0.045902014830227],
    [0.077678536117054, 0.047951833750597],
    [0.076396684949434, 0.049968788879362],
    [0.075062475310050, 0.051951497896226],
    [0.073676821599542, 0.053898601951466],
    [0.072240673475749, 0.055808766597225],
    [0.070755015202858, 0.057680682702068],
    [0.069220864976840, 0.059513067348201],
    [0.067639274227625, 0.061304664710718],
    [0.066011326898512, 0.063054246918278],
    [0.064338138703282, 0.064760614894630],
    [0.062620856361546, 0.066422599180399],
    [0.060860656812842, 0.068039060734572],
    [0.059058746410016, 0.069608891715145],
    [0.057216360092450, 0.071131016238378],
    [0.055334760539699, 0.072604391116154],
    [0.053415237306106, 0.074028006570930],
    [0.051459105937014, 0.075400886927784],
    [0.049467707067153, 0.076722091283096],
    [0.047442405501835, 0.077990714149396],
    [0.045384589281588, 0.079205886075941],
    [0.043295668730857, 0.080366774244592],
    [0.041177075491445, 0.081472583040586],
    [0.039030261541332, 0.082522554597810],
    [0.036856698199564, 0.083515969318206],
    [0.034657875117883, 0.084452146364948],
    [0.032435299259796, 0.085330444129049],
    [0.030190493867775, 0.086150260669096],
    [0.027924997419306, 0.086911034123781],
    [0.025640362572491, 0.087612243096981],
    [0.023338155101933, 0.088253407015092],
    [0.021019952825636, 0.088834086456390],
    [0.018687344523641, 0.089353883452193],
    [0.016341928849164, 0.089812441759604],
    [0.013985313232951, 0.090209447105664],
    [0.011619112781631, 0.090544627402740],
    [0.009244949170797, 0.090817752935000],
    [0.006864449533597, 0.091028636515846],
    [0.004479245345574, 0.091177133616206],
    [0.002090971306534, 0.091263142463585]
];                    
},{}],11:[function(require,module,exports){
/*
 * AAC.js - Advanced Audio Coding decoder in JavaScript
 * Created by Devon Govett
 * Copyright (c) 2012, Official.fm Labs
 *
 * AAC.js is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as 
 * published by the Free Software Foundation; either version 3 of the 
 * License, or (at your option) any later version.
 *
 * AAC.js is distributed in the hope that it will be useful, but WITHOUT 
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General 
 * Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.
 * If not, see <http://www.gnu.org/licenses/>.
 */

/********************************************************************************
 * Sample offset into the window indicating the beginning of a scalefactor
 * window band
 *
 * scalefactor window band - term for scalefactor bands within a window,
 * given in Table 4.110 to Table 4.128.
 *
 * scalefactor band - a set of spectral coefficients which are scaled by one
 * scalefactor. In case of EIGHT_SHORT_SEQUENCE and grouping a scalefactor band
 * may contain several scalefactor window bands of corresponding frequency. For
 * all other window_sequences scalefactor bands and scalefactor window bands are
 * identical.
 *******************************************************************************/
var SWB_OFFSET_1024_96 = new Uint16Array([
      0,   4,   8,  12,  16,  20,  24,  28,
     32,  36,  40,  44,  48,  52,  56,  64,
     72,  80,  88,  96, 108, 120, 132, 144,
    156, 172, 188, 212, 240, 276, 320, 384,
    448, 512, 576, 640, 704, 768, 832, 896,
    960, 1024
]);

var SWB_OFFSET_128_96 = new Uint16Array([
    0, 4, 8, 12, 16, 20, 24, 32, 40, 48, 64, 92, 128
]);

var SWB_OFFSET_1024_64 = new Uint16Array([
      0,   4,   8,  12,  16,  20,  24,  28,
     32,  36,  40,  44,  48,  52,  56,  64,
     72,  80,  88, 100, 112, 124, 140, 156,
    172, 192, 216, 240, 268, 304, 344, 384,
    424, 464, 504, 544, 584, 624, 664, 704,
    744, 784, 824, 864, 904, 944, 984, 1024
]);

var SWB_OFFSET_128_64 = new Uint16Array([
    0, 4, 8, 12, 16, 20, 24, 32, 40, 48, 64, 92, 128
]);

var SWB_OFFSET_1024_48 = new Uint16Array([
      0,   4,   8,  12,  16,  20,  24,  28,
     32,  36,  40,  48,  56,  64,  72,  80,
     88,  96, 108, 120, 132, 144, 160, 176,
    196, 216, 240, 264, 292, 320, 352, 384,
    416, 448, 480, 512, 544, 576, 608, 640,
    672, 704, 736, 768, 800, 832, 864, 896,
    928, 1024
]);

var SWB_OFFSET_128_48 = new Uint16Array([
     0,   4,   8,  12,  16,  20,  28,  36,
    44,  56,  68,  80,  96, 112, 128
]);

var SWB_OFFSET_1024_32 = new Uint16Array([
      0,   4,   8,  12,  16,  20,  24,  28,
     32,  36,  40,  48,  56,  64,  72,  80,
     88,  96, 108, 120, 132, 144, 160, 176,
    196, 216, 240, 264, 292, 320, 352, 384,
    416, 448, 480, 512, 544, 576, 608, 640,
    672, 704, 736, 768, 800, 832, 864, 896,
    928, 960, 992, 1024
]);

var SWB_OFFSET_1024_24 = new Uint16Array([
      0,   4,   8,  12,  16,  20,  24,  28,
     32,  36,  40,  44,  52,  60,  68,  76,
     84,  92, 100, 108, 116, 124, 136, 148,
    160, 172, 188, 204, 220, 240, 260, 284,
    308, 336, 364, 396, 432, 468, 508, 552,
    600, 652, 704, 768, 832, 896, 960, 1024
]);

var SWB_OFFSET_128_24 = new Uint16Array([
     0,   4,   8,  12,  16,  20,  24,  28,
    36,  44,  52,  64,  76,  92, 108, 128
]);

var SWB_OFFSET_1024_16 = new Uint16Array([
      0,   8,  16,  24,  32,  40,  48,  56,
     64,  72,  80,  88, 100, 112, 124, 136,
    148, 160, 172, 184, 196, 212, 228, 244,
    260, 280, 300, 320, 344, 368, 396, 424,
    456, 492, 532, 572, 616, 664, 716, 772,
    832, 896, 960, 1024
]);

var SWB_OFFSET_128_16 = new Uint16Array([
     0,   4,   8,  12,  16,  20,  24,  28,
    32,  40,  48,  60,  72,  88, 108, 128
]);

var SWB_OFFSET_1024_8 = new Uint16Array([
      0,  12,  24,  36,  48,  60,  72,  84,
     96, 108, 120, 132, 144, 156, 172, 188,
    204, 220, 236, 252, 268, 288, 308, 328,
    348, 372, 396, 420, 448, 476, 508, 544,
    580, 620, 664, 712, 764, 820, 880, 944,
    1024
]);

var SWB_OFFSET_128_8 = new Uint16Array([
     0,   4,   8,  12,  16,  20,  24,  28,
    36,  44,  52,  60,  72,  88, 108, 128
]);

exports.SWB_OFFSET_1024 = [
    SWB_OFFSET_1024_96,
    SWB_OFFSET_1024_96,
    SWB_OFFSET_1024_64,
    SWB_OFFSET_1024_48,
    SWB_OFFSET_1024_48,
    SWB_OFFSET_1024_32,
    SWB_OFFSET_1024_24,
    SWB_OFFSET_1024_24,
    SWB_OFFSET_1024_16,
    SWB_OFFSET_1024_16,
    SWB_OFFSET_1024_16,
    SWB_OFFSET_1024_8
];

exports.SWB_OFFSET_128 = [
    SWB_OFFSET_128_96,
    SWB_OFFSET_128_96,
    SWB_OFFSET_128_64,
    SWB_OFFSET_128_48,
    SWB_OFFSET_128_48,
    SWB_OFFSET_128_48,
    SWB_OFFSET_128_24,
    SWB_OFFSET_128_24,
    SWB_OFFSET_128_16,
    SWB_OFFSET_128_16,
    SWB_OFFSET_128_16,
    SWB_OFFSET_128_8
];

exports.SWB_SHORT_WINDOW_COUNT = new Uint8Array([
    12, 12, 12, 14, 14, 14, 15, 15, 15, 15, 15, 15
]);

exports.SWB_LONG_WINDOW_COUNT = new Uint8Array([
    41, 41, 47, 49, 49, 51, 47, 47, 43, 43, 43, 40
]);

/*
 * Scalefactor lookup table
 */
exports.SCALEFACTOR_TABLE = (function() {
    var table = new Float32Array(428);
    
    for (var i = 0; i < 428; i++) {
        table[i] = Math.pow(2, (i - 200) / 4);
    }
    
    return table;
})();


/**
 * Inverse quantization lookup table
 */
exports.IQ_TABLE = (function() {
    var table = new Float32Array(8191),
        four_thirds = 4/3;
        
    for (var i = 0; i < 8191; i++) {
        table[i] = Math.pow(i, four_thirds);
    }
    
    return table;
})();

exports.SAMPLE_RATES = new Int32Array([
    96000, 88200, 64000, 48000, 44100, 32000,
    24000, 22050, 16000, 12000, 11025, 8000, 7350    
]);

},{}],12:[function(require,module,exports){
/*
 * AAC.js - Advanced Audio Coding decoder in JavaScript
 * Created by Devon Govett
 * Copyright (c) 2012, Official.fm Labs
 *
 * AAC.js is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as 
 * published by the Free Software Foundation; either version 3 of the 
 * License, or (at your option) any later version.
 *
 * AAC.js is distributed in the hope that it will be useful, but WITHOUT 
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General 
 * Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.
 * If not, see <http://www.gnu.org/licenses/>.
 */
    
// Temporal Noise Shaping
function TNS(config) {
    this.maxBands = TNS_MAX_BANDS_1024[config.sampleIndex]
    this.nFilt = new Int32Array(8);
    this.length = new Array(8);
    this.direction = new Array(8);
    this.order = new Array(8);
    this.coef = new Array(8);
    
    // Probably could allocate these as needed
    for (var w = 0; w < 8; w++) {
        this.length[w] = new Int32Array(4);
        this.direction[w] = new Array(4);
        this.order[w] = new Int32Array(4);
        this.coef[w] = new Array(4);
        
        for (var filt = 0; filt < 4; filt++) {
            this.coef[w][filt] = new Float32Array(TNS_MAX_ORDER);
        }
    }
    
    this.lpc = new Float32Array(TNS_MAX_ORDER);
    this.tmp = new Float32Array(TNS_MAX_ORDER);
}

var TNS_MAX_ORDER = 20,
      SHORT_BITS = [1, 4, 3],
      LONG_BITS = [2, 6, 5];
      
var TNS_COEF_1_3 = [0.00000000, -0.43388373, 0.64278758, 0.34202015],

      TNS_COEF_0_3 = [0.00000000, -0.43388373, -0.78183150, -0.97492790,
                      0.98480773, 0.86602539, 0.64278758, 0.34202015],
                      
      TNS_COEF_1_4 = [0.00000000, -0.20791170, -0.40673664, -0.58778524,
                      0.67369562, 0.52643216, 0.36124167, 0.18374951],
                      
      TNS_COEF_0_4 = [0.00000000, -0.20791170, -0.40673664, -0.58778524,
                      -0.74314481, -0.86602539, -0.95105654, -0.99452192,
                      0.99573416, 0.96182561, 0.89516330, 0.79801720,
                      0.67369562, 0.52643216, 0.36124167, 0.18374951],
                      
      TNS_TABLES = [TNS_COEF_0_3, TNS_COEF_0_4, TNS_COEF_1_3, TNS_COEF_1_4];
      
var TNS_MAX_BANDS_1024 = [31, 31, 34, 40, 42, 51, 46, 46, 42, 42, 42, 39, 39],
      TNS_MAX_BANDS_128 = [9, 9, 10, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14];

TNS.prototype.decode = function(stream, info) {
    var windowCount = info.windowCount,
        bits = info.windowSequence === 2 ? SHORT_BITS : LONG_BITS;
    
    for (var w = 0; w < windowCount; w++) {
        if (this.nFilt[w] = stream.read(bits[0])) {
            var coefRes = stream.read(1),
                nFilt_w = this.nFilt[w],
                length_w = this.length[w],
                order_w = this.order[w],
                direction_w = this.direction[w],
                coef_w = this.coef[w];
            
            for (var filt = 0; filt < nFilt_w; filt++) {
                length_w[filt] = stream.read(bits[1]);
                
                if ((order_w[filt] = stream.read(bits[2])) > 20)
                    throw new Error("TNS filter out of range: " + order_w[filt]);
                
                if (order_w[filt]) {
                    direction_w[filt] = !!stream.read(1);
                    var coefCompress = stream.read(1),
                        coefLen = coefRes + 3 - coefCompress,
                        tmp = 2 * coefCompress + coefRes,
                        table = TNS_TABLES[tmp],
                        order_w_filt = order_w[filt],
                        coef_w_filt = coef_w[filt];
                        
                    for (var i = 0; i < order_w_filt; i++)
                        coef_w_filt[i] = table[stream.read(coefLen)];
                }
                    
            }
        }
    }
};

TNS.prototype.process = function(ics, data, decode) {
    var mmm = Math.min(this.maxBands, ics.maxSFB),
        lpc = this.lpc,
        tmp = this.tmp,
        info = ics.info,
        windowCount = info.windowCount;
        
    for (var w = 0; w < windowCount; w++) {
        var bottom = info.swbCount,
            nFilt_w = this.nFilt[w],
            length_w = this.length[w],
            order_w = this.order[w],
            coef_w = this.coef[w],
            direction_w = this.direction[w];
        
        for (var filt = 0; filt < nFilt_w; filt++) {
            var top = bottom,
                bottom = Math.max(0, tmp - length_w[filt]),
                order = order_w[filt];
                
            if (order === 0) continue;
            
            // calculate lpc coefficients
            var autoc = coef_w[filt];
            for (var i = 0; i < order; i++) {
                var r = -autoc[i];
                lpc[i] = r;

                for (var j = 0, len = (i + 1) >> 1; j < len; j++) {
                    var f = lpc[j],
                        b = lpc[i - 1 - j];

                    lpc[j] = f + r * b;
                    lpc[i - 1 - j] = b + r * f;
                }
            }
            
            var start = info.swbOffsets[Math.min(bottom, mmm)],
                end = info.swbOffsets[Math.min(top, mmm)],
                size,
                inc = 1;
                
            if ((size = end - start) <= 0) continue;
            
            if (direction_w[filt]) {
                inc = -1;
                start = end - 1;
            }
            
            start += w * 128;
            
            if (decode) {
                // ar filter
                for (var m = 0; m < size; m++, start += inc) {
                    for (var i = 1; i <= Math.min(m, order); i++) {
                        data[start] -= data[start - i * inc] * lpc[i - 1];
                    }
                }
            } else {
                // ma filter
                for (var m = 0; m < size; m++, start += inc) {
                    tmp[0] = data[start];
                    
                    for (var i = 1; i <= Math.min(m, order); i++)
                        data[start] += tmp[i] * lpc[i - 1];
                    
                    for (var i = order; i > 0; i--)
                        tmp[i] = tmp[i - 1];
                }
            }
        }
    }
};
    
module.exports = TNS;

},{}]},{},[4])


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