source: trunk/as3/com/jeroenwijering/models/SmoothModel.as @ 355

/**
* Model that smoothly plays back a video segmented in smaller chunks.
**/
package com.jeroenwijering.models {


import com.jeroenwijering.events.*;
import com.jeroenwijering.models.AbstractModel;
import com.jeroenwijering.parsers.SmoothParser;
import com.jeroenwijering.player.Model;

import flash.display.Sprite;
import flash.events.*;
import flash.media.*;
import flash.net.*;
import flash.utils.*;


public class SmoothModel extends AbstractModel {


        /** Currently playing chunk. **/
        private var chunk:Number;
        /** Chunk that is up next. **/
        private var next:Number;
        /** All available video chunks. **/
        private var chunks:Array;
        /** Container that switches the two video objects. **/
        private var container:Sprite;
        /** Index metadata of the stream. **/
        private var index:Object;
        /** ID for the position interval. **/
        private var interval:Number;
        /** Currently active level. **/
        private var level:Number = 0;
        /** All available quality levels. **/
        private var levels:Array;
        /** Loader that loads the manifest XML file. **/
        private var loader:URLLoader;
        /** Soundtransform object. **/
        private var transform:SoundTransform;


        /** Constructor; sets up the connection and display. **/
        public function SmoothModel(mod:Model):void {
                super(mod);
                container = new Sprite();
                container.graphics.drawRect(0,0,320,240);
                loader = new URLLoader();
                loader.addEventListener(Event.COMPLETE, loaderHandler);
                loader.addEventListener(SecurityErrorEvent.SECURITY_ERROR,errorHandler);
                loader.addEventListener(IOErrorEvent.IO_ERROR,errorHandler);
                transform = new SoundTransform();
        };


        /** Catch playback errors. **/
        private function errorHandler(evt:ErrorEvent):void {
                stop();
                model.sendEvent(ModelEvent.ERROR,{message:evt.text});
        };


        /** Load content. **/
        override public function load(itm:Object):void {
                item = itm;
                level = 0;
                chunk = 0;
                position = item['start'];
                if(model.config['mute']) {
                         transform.volume = 0;
                } else { 
                         transform.volume = model.config['volume']/100;
                }
                loader.load(new URLRequest(item['file']));
                model.mediaHandler(container);
                model.sendEvent(ModelEvent.BUFFER,{percentage:0});
                model.sendEvent(ModelEvent.STATE,{newstate:ModelStates.BUFFERING});
        };


        /** Load a chunk for playback. **/
        private function loadChunk(chk:Number):void {
                //var url:String = item['file'].substr(0,item['file'].length-3)+'mp4';
                var url:String = 'http://h264.code-shop.com:8080/ccc.mp4';
                url += '?start='+chunks[chk]['start'];
                url += '&end='+chunks[chk]['end'];
                chunks[chk].connection = new NetConnection();
                chunks[chk].connection.connect(null);
                chunks[chk].netstream = new NetStream(chunks[chk].connection);
                chunks[chk].netstream.client = new Object();
                chunks[chk].netstream.soundTransform = transform;
                chunks[chk].netstream.play(url);
                chunks[chk].netstream.pause();
                chunks[chk].video = new Video(320,240);
                chunks[chk].video.smoothing = model.config['smoothing'];
                chunks[chk].video.visible = false;
                chunks[chk].video.attachNetStream(chunks[chk].netstream);
                container.addChild(chunks[chk].video);
                next = chk;
        };


        /** Start playing a chunk. **/
        private function playChunk(chk:Number=0):void {
                chunks[chk].netstream.resume();
                chunks[chk].video.visible = true;
                chunk = chk;
        };


        /** Remove the current chunk. **/
        private function killChunk(chk:Number):void {
                if(chunks[chk] && chunks[chk].netstream) {
                        chunks[chk].netstream.close();
                }
        };


        /** Get the metadata, levels and chunks from the manifest. **/
        private function loaderHandler(evt:Event):void {
                var xml:XML = XML(evt.target.data);
                index = SmoothParser.parseIndex(xml);
                model.sendEvent(ModelEvent.META,index);
                levels = SmoothParser.parseLevels(xml);
                chunks = SmoothParser.parseChunks(xml);
                if(levels.length == 0 || chunks.length == 0) {
                        errorHandler(new ErrorEvent(ErrorEvent.ERROR,false,false,
                                "SmoothStreaming manifest contains no quality levels or chunks."))
                } else {
                        setLevel();
                        seek(item['start']);
                }
        };


        /** Pause playback. **/
        override public function pause():void {
                chunks[chunk].netstream.pause();
                clearInterval(interval);
                model.sendEvent(ModelEvent.STATE,{newstate:ModelStates.PAUSED});
        };


        /** Resume playing. **/
        override public function play():void {
                chunks[chunk].netstream.resume();
                interval = setInterval(positionInterval,40);
                model.sendEvent(ModelEvent.STATE,{newstate:ModelStates.PLAYING});
        };


        /** Interval for the position progress **/
        private function positionInterval():void {
                var chk:Number = chunk;
                var obj:Object = chunks[chunk];
                var pos:Number = obj['start']+obj.netstream.time;
                if(model.config['state'] != ModelStates.PLAYING) {
                        model.sendEvent(ModelEvent.STATE,{newstate:ModelStates.PLAYING});
                }
                if(pos > obj['end']-0.15) {
                        setTimeout(killChunk,2000,chk);
                        playChunk(chk+1);
                        setTimeout(loadChunk,1000,chk+2);
                }
                if(pos < item['duration']) {
                        pos = Math.round(pos*10)/10;
                        if(pos != position) {
                                position = pos;
                                model.sendEvent(ModelEvent.TIME,{position:pos,duration:item['duration'],chunk:chk});
                        }
                } else if (item['duration'] > 0) {
                        obj.netstream.pause();
                        clearInterval(interval);
                        model.sendEvent(ModelEvent.STATE,{newstate:ModelStates.COMPLETED});
                }
        };


        /** Seek to a new position. **/
        override public function seek(pos:Number):void {
                position = pos;
                clearInterval(interval);
                killChunk(chunk);
                killChunk(next);
                for (var i:Number=0; i<chunks.length; i++) {
                        if(chunks[i]['end'] > pos && chunks[i]['start'] <= pos) {
                                loadChunk(i);
                                playChunk(i);
                                setTimeout(loadChunk,1000,i+1);
                                break;
                        }
                }
                interval = setInterval(positionInterval,40);
                model.sendEvent(ModelEvent.STATE,{newstate:ModelStates.BUFFERING});
        };


        /** Set a specific stream level. **/
        private function setLevel():void {
                level = 0;
                model.sendEvent(ModelEvent.META,levels[level]);
        };


        /** Destroy the video. **/
        override public function stop():void {
                killChunk(chunk);
                killChunk(next);
                clearInterval(interval);
                position = item['start'];
                model.sendEvent(ModelEvent.STATE,{newstate:ModelStates.IDLE});
        };


        /** Set the volume level. **/
        override public function volume(vol:Number):void {
                transform.volume = vol/100;
                chunks[chunk].netstream.soundTransform = transform;
        };


};


}