diff --git a/trunk/research/players/img/tooltip.png b/trunk/research/players/img/tooltip.png
new file mode 100644
index 000000000..eaee2aebc
Binary files /dev/null and b/trunk/research/players/img/tooltip.png differ
diff --git a/trunk/research/players/js/srs.js b/trunk/research/players/js/srs.js
index 47b9bcf7c..13b3acc0e 100755
--- a/trunk/research/players/js/srs.js
+++ b/trunk/research/players/js/srs.js
@@ -1,3 +1,6 @@
+/**
+* update the navigator, add same query string.
+*/
 function update_nav() {
     $("#nav_srs_player").attr("href", "srs_player.html" + window.location.search);
     $("#nav_srs_publisher").attr("href", "srs_publisher.html" + window.location.search);
@@ -7,6 +10,9 @@ function update_nav() {
     $("#nav_vlc").attr("href", "vlc.html" + window.location.search);
 }
 
+/**
+* parse the query string to object.
+*/
 function parse_query_string(){
     var query_string = String(window.location.search).replace(" ", "").split("?")[1];
     if(query_string == undefined){
@@ -60,6 +66,11 @@ function build_default_hls_url() {
     return "http://" + vhost + ":" + port + "/" + app + "/" + stream + ".m3u8";
 }
 
+/**
+* initialize the page.
+* @param rtmp_url the rtmp stream url to play
+* @param hls_url the hls stream url to play
+*/
 function srs_init(rtmp_url, hls_url) {
     update_nav();
     
@@ -70,3 +81,146 @@ function srs_init(rtmp_url, hls_url) {
         $(hls_url).val(build_default_hls_url());
     }
 }
+
+//////////////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////////////
+/**
+* the SrsPlayer object.
+*/
+function SrsPlayer(container, stream_url, width, height, buffer_time) {
+    if (!SrsPlayer.__id) {
+        SrsPlayer.__id = 100;
+    }
+    if (!SrsPlayer.__players) {
+        SrsPlayer.__players = [];
+    }
+    
+    SrsPlayer.__players.push(this);
+    
+    this.container = container;
+    this.stream_url = stream_url;
+    this.width = width;
+    this.height = height;
+    this.buffer_time = buffer_time;
+    this.id = SrsPlayer.__id++;
+    this.callbackObj = null;
+    
+    // callback set the following values.
+    this.meatadata = {}; // for on_player_metadata
+}
+/**
+* user can set some callback, then start the player.
+* callbacks:
+*      on_player_ready():int, when srs player ready, user can play.
+*      on_player_metadata(metadata:Object):int, when srs player get metadata.
+*/
+SrsPlayer.prototype.start = function() {
+    // embed the flash.
+    var flashvars = {};
+    flashvars.id = this.id;
+    flashvars.on_player_ready = "__srs_on_player_ready";
+    flashvars.on_player_metadata = "__srs_on_player_metadata";
+    
+    var params = {};
+    params.wmode = "opaque";
+    params.allowFullScreen = "true";
+    params.allowScriptAccess = "always";
+    
+    var attributes = {};
+    
+    var self = this;
+    
+    swfobject.embedSWF(
+        "srs_player/release/srs_player.swf", this.container,
+        this.width, this.height,
+        "11.1", "js/AdobeFlashPlayerInstall.swf",
+        flashvars, params, attributes,
+        function(callbackObj){
+            self.callbackObj = callbackObj;
+        }
+    );
+    
+    return this;
+}
+SrsPlayer.prototype.play = function() {
+    return this.callbackObj.ref.__play(this.stream_url, this.width, this.height, this.buffer_time);
+}
+SrsPlayer.prototype.stop = function() {
+    for (var i = 0; i < SrsPlayer.__players.length; i++) {
+        var player = SrsPlayer.__players[i];
+        
+        if (player.id != this.id) {
+            continue;
+        }
+        
+        SrsPlayer.__players.splice(i, 1);
+        break;
+    }
+    return this.callbackObj.ref.__stop();
+}
+SrsPlayer.prototype.pause = function() {
+    return this.callbackObj.ref.__pause();
+}
+SrsPlayer.prototype.resume = function() {
+    return this.callbackObj.ref.__resume();
+}
+/**
+* to set the DAR, for example, DAR=16:9
+* @param num, for example, 9. 
+*       use metadata height if 0.
+*       use user specified height if -1.
+* @param den, for example, 16. 
+*       use metadata width if 0.
+*       use user specified width if -1.
+*/
+SrsPlayer.prototype.dar = function(num, den) {
+    return this.callbackObj.ref.__dar(num, den);
+}
+/**
+* set the fullscreen size data.
+* @refer the refer fullscreen mode. it can be:
+*       video: use video orignal size.
+*       screen: use screen size to rescale video.
+* @param percent, the rescale percent, where
+*       100 means 100%.
+*/
+SrsPlayer.prototype.set_fs = function(refer, percent) {
+    return this.callbackObj.ref.__set_fs(refer, percent);
+}
+SrsPlayer.prototype.on_player_ready = function() {
+    return this.play();
+}
+SrsPlayer.prototype.on_player_metadata = function(metadata) {
+    return 0;
+}
+function __srs_on_player_ready(id) {
+    for (var i = 0; i < SrsPlayer.__players.length; i++) {
+        var player = SrsPlayer.__players[i];
+        
+        if (player.id != id) {
+            continue;
+        }
+        
+        return player.on_player_ready();
+    }
+    
+    throw new Error("player not found. id=" + id);
+}
+function __srs_on_player_metadata(id, metadata) {
+    for (var i = 0; i < SrsPlayer.__players.length; i++) {
+        var player = SrsPlayer.__players[i];
+        
+        if (player.id != id) {
+            continue;
+        }
+        
+        // user may override the on_player_metadata, 
+        // so set the data before invoke it.
+        player.metadata = metadata;
+        
+        return player.on_player_metadata(metadata);
+    }
+    
+    throw new Error("player not found. id=" + id);
+}
diff --git a/trunk/research/players/srs_player.html b/trunk/research/players/srs_player.html
index 988ae3ba4..2ec9c81ed 100755
--- a/trunk/research/players/srs_player.html
+++ b/trunk/research/players/srs_player.html
@@ -14,13 +14,30 @@
         }
     </style>
     <script type="text/javascript">
-        var active_dar = null;
-        function select_dar(dar_id) {
-            if (active_dar) {
-                active_dar.removeClass("active");
+        var srs_player = null;
+        
+        var __active_dar = null;
+        function select_dar(dar_id, num, den) {
+            srs_player.dar(num, den);
+            
+            if (__active_dar) {
+                __active_dar.removeClass("active");
             }
-            active_dar = $(dar_id).parent();
-            active_dar.addClass("active");
+            
+            __active_dar = $(dar_id).parent();
+            __active_dar.addClass("active");
+        }
+        
+        var __active_size = null;
+        function select_fs_size(size_id, refer, percent) {
+            srs_player.set_fs(refer, percent);
+            
+            if (__active_size) {
+                __active_size.removeClass("active");
+            }
+            
+            __active_size = $(size_id).parent();
+            __active_size.addClass("active");
         }
         
         $(function(){
@@ -29,9 +46,15 @@
             // url set to: rtmp://demo:1935/live/livestream
             srs_init($("#txt_url"));
             
-            var srs_player = null;
-        
+            $("#fs_tips").tooltip({
+                title: "点击视频进入或退出全屏"
+            });
+            
             $("#main_modal").on("show", function(){
+                if (srs_player) {
+                    return;
+                }
+                
                 $("#div_container").remove();
                 
                 var obj = $("<div/>");
@@ -51,16 +74,22 @@
                 }
                 srs_player.on_player_metadata = function(metadata) {
                     $("#btn_dar_original").text("视频原始比例" + "(" + metadata.width + ":" + metadata.height + ")");
-                    srs_player.dar(0, 0);
-                    select_dar("#btn_dar_original");
-                    
+                    select_dar("#btn_dar_original", 0, 0);
+                    select_fs_size("#btn_fs_size_screen_100", "screen", 100);
                     return 0;
                 }
                 srs_player.start();
             });
             
             $("#main_modal").on("hide", function(){
-                srs_player.stop();
+                if ($("#main_modal").is(":visible")) {
+                    return;
+                }
+                
+                if (srs_player) {
+                    srs_player.stop();
+                    srs_player = null;
+                }
             });
             
             $("#btn_play").click(function(){
@@ -68,177 +97,54 @@
             });
             
             $("#btn_pause").click(function(){
-                if ($("#btn_pause").text() == "暂停") {
-                    $("#btn_pause").text("继续");
+                if ($("#btn_pause").text() == "暂停播放") {
+                    $("#btn_pause").text("继续播放");
                     srs_player.pause();
                 } else {
-                    $("#btn_pause").text("暂停");
+                    $("#btn_pause").text("暂停播放");
                     srs_player.resume();
                 }
             });
             
-            $("#btn_dar_original").click(function(){
-                srs_player.dar(0, 0);
-                select_dar("#btn_dar_original");
-            });
-            $("#btn_dar_21_9").click(function(){
-                srs_player.dar(9, 21);
-                select_dar("#btn_dar_21_9");
-            });
-            $("#btn_dar_16_9").click(function(){
-                srs_player.dar(9, 16);
-                select_dar("#btn_dar_16_9");
-            });
-            $("#btn_dar_4_3").click(function(){
-                srs_player.dar(3, 4);
-                select_dar("#btn_dar_4_3");
-            });
-            $("#btn_dar_fill").click(function(){
-                srs_player.dar(-1, -1);
-                select_dar("#btn_dar_fill");
-            });
-        });
-        
-        /*
-        * the SrsPlayer object.
-        */
-        function SrsPlayer(container, stream_url, width, height, buffer_time) {
-            if (!SrsPlayer.__id) {
-                SrsPlayer.__id = 100;
-            }
-            if (!SrsPlayer.__players) {
-                SrsPlayer.__players = [];
-            }
-            
-            SrsPlayer.__players.push(this);
-            
-            this.container = container;
-            this.stream_url = stream_url;
-            this.width = width;
-            this.height = height;
-            this.buffer_time = buffer_time;
-            this.id = SrsPlayer.__id++;
-            this.callbackObj = null;
-            
-            // callback set the following values.
-            this.meatadata = {}; // for on_player_metadata
-        }
-        /*
-        * user can set some callback, then start the player.
-        * callbacks:
-        *      on_player_ready():int, when srs player ready, user can play.
-        *      on_player_metadata(metadata:Object):int, when srs player get metadata.
-        */
-        SrsPlayer.prototype.start = function() {
-            // embed the flash.
-            var flashvars = {};
-            flashvars.id = this.id;
-            flashvars.on_player_ready = "__srs_on_player_ready";
-            flashvars.on_player_metadata = "__srs_on_player_metadata";
-            
-            var params = {};
-            params.wmode = "opaque";
-            params.allowFullScreen = true;
-            params.allowScriptAccess = "always";
-            
-            var attributes = {};
-            
-            var self = this;
-            
-            swfobject.embedSWF(
-                "srs_player/release/srs_player.swf", this.container,
-                this.width, this.height,
-                "11.1", "js/AdobeFlashPlayerInstall.swf",
-                flashvars, params, attributes,
-                function(callbackObj){
-                    self.callbackObj = callbackObj;
-                }
-            );
-            
-            return this;
-        }
-        SrsPlayer.prototype.play = function() {
-            return this.callbackObj.ref.__play(this.stream_url, this.width, this.height, this.buffer_time);
-        }
-        SrsPlayer.prototype.stop = function() {
-            for (var i = 0; i < SrsPlayer.__players.length; i++) {
-                var player = SrsPlayer.__players[i];
-                
-                if (player.id != this.id) {
-                    continue;
-                }
-                
-                SrsPlayer.__players.splice(i, 1);
-                break;
-            }
-            return this.callbackObj.ref.__stop();
-        }
-        SrsPlayer.prototype.pause = function() {
-            return this.callbackObj.ref.__pause();
-        }
-        SrsPlayer.prototype.resume = function() {
-            return this.callbackObj.ref.__resume();
-        }
-        /*
-        * to set the DAR, for example, DAR=16:9
-        * @param num, for example, 9. 
-        *       use metadata height if 0.
-        *       use user specified height if -1.
-        * @param den, for example, 16. 
-        *       use metadata width if 0.
-        *       use user specified width if -1.
-        */
-        SrsPlayer.prototype.dar = function(num, den) {
-            if (num == 0 && this.metadata) {
-                num = this.metadata.height;
-            } else if (num == -1) {
-                num = this.height;
+            if (true) {
+                $("#btn_dar_original").click(function(){
+                    select_dar("#btn_dar_original", 0, 0);
+                });
+                $("#btn_dar_21_9").click(function(){
+                    select_dar("#btn_dar_21_9", 9, 21);
+                });
+                $("#btn_dar_16_9").click(function(){
+                    select_dar("#btn_dar_16_9", 9, 16);
+                });
+                $("#btn_dar_4_3").click(function(){
+                    select_dar("#btn_dar_4_3", 3, 4);
+                });
+                $("#btn_dar_fill").click(function(){
+                    select_dar("#btn_dar_fill", -1, -1);
+                });
             }
             
-            if (den == 0 && this.metadata) {
-                den = this.metadata.width;
-            } else if (den == -1) {
-                den = this.width;
+            if (true) {
+                $("#btn_fs_size_video_100").click(function(){
+                    select_fs_size("#btn_fs_size_video_100", "video", 100);
+                });
+                $("#btn_fs_size_video_75").click(function(){
+                    select_fs_size("#btn_fs_size_video_75", "video", 75);
+                });
+                $("#btn_fs_size_video_50").click(function(){
+                    select_fs_size("#btn_fs_size_video_50", "video", 50);
+                });
+                $("#btn_fs_size_screen_100").click(function(){
+                    select_fs_size("#btn_fs_size_screen_100", "screen", 100);
+                });
+                $("#btn_fs_size_screen_75").click(function(){
+                    select_fs_size("#btn_fs_size_screen_75", "screen", 75);
+                });
+                $("#btn_fs_size_screen_50").click(function(){
+                    select_fs_size("#btn_fs_size_screen_50", "screen", 50);
+                });
             }
-            
-            return this.callbackObj.ref.__dar(num, den);
-        }
-        SrsPlayer.prototype.on_player_ready = function() {
-            return this.play();
-        }
-        SrsPlayer.prototype.on_player_metadata = function(metadata) {
-            return 0;
-        }
-        function __srs_on_player_ready(id) {
-            for (var i = 0; i < SrsPlayer.__players.length; i++) {
-                var player = SrsPlayer.__players[i];
-                
-                if (player.id != id) {
-                    continue;
-                }
-                
-                return player.on_player_ready();
-            }
-            
-            throw new Error("player not found. id=" + id);
-        }
-        function __srs_on_player_metadata(id, metadata) {
-            for (var i = 0; i < SrsPlayer.__players.length; i++) {
-                var player = SrsPlayer.__players[i];
-                
-                if (player.id != id) {
-                    continue;
-                }
-                
-                // user may override the on_player_metadata, 
-                // so set the data before invoke it.
-                player.metadata = metadata;
-                
-                return player.on_player_metadata(metadata);
-            }
-            
-            throw new Error("player not found. id=" + id);
-        }
+        });
     </script>
 </head>
 <body>
@@ -278,17 +184,37 @@
         </div>
         <div class="modal-footer">
             <div class="btn-group dropup">
-                <button class="btn dropdown-toggle" data-toggle="dropdown">宽高比 <span class="caret"></span></button>
+                <button class="btn dropdown-toggle" data-toggle="dropdown">
+                    <a id="fs_tips" href="#" data-toggle="tooltip" data-placement="top" title="">
+                        <img src="img/tooltip.png"/>
+                    </a>
+                    全屏大小<span class="caret"></span>
+                </button>
+                <ul class="dropdown-menu">
+                    <li><a id="btn_fs_size_screen_100" href="#">屏幕大小(100%)</a></li>
+                    <li><a id="btn_fs_size_screen_75" href="#">屏幕大小(75%)</a></li>
+                    <li><a id="btn_fs_size_screen_50" href="#">屏幕大小(50%)</a></li>
+                    <li><a id="btn_fs_size_video_100" href="#">视频大小(100%)</a></li>
+                    <li><a id="btn_fs_size_video_75" href="#">视频大小(75%)</a></li>
+                    <li><a id="btn_fs_size_video_50" href="#">视频大小(50%)</a></li>
+                </ul>
+            </div>
+            <div class="btn-group dropup">
+                <button class="btn dropdown-toggle" data-toggle="dropdown">显示比例<span class="caret"></span></button>
                 <ul class="dropdown-menu">
                     <li><a id="btn_dar_original" href="#">视频原始比例</a></li>
                     <li><a id="btn_dar_21_9" href="#">宽屏影院(21:9)</a></li>
                     <li><a id="btn_dar_16_9" href="#">宽屏电影(16:9)</a></li>
                     <li><a id="btn_dar_4_3" href="#">窄屏(4:3)</a></li>
-                    <li><a id="btn_dar_fill" href="#">填充</a></li>
+                    <li><a id="btn_dar_fill" href="#">填充(容器比例)</a></li>
                 </ul>
             </div>
-            <button id="btn_pause" class="btn">暂停</button>
-            <button class="btn btn-primary" data-dismiss="modal" aria-hidden="true">关闭</button>
+            <div class="btn-group dropup">
+                <button id="btn_pause" class="btn">暂停播放</button>
+            </div>
+            <div class="btn-group dropup">
+                <button class="btn btn-primary" data-dismiss="modal" aria-hidden="true">关闭</button>
+            </div>
         </div>
     </div>
     <hr>
diff --git a/trunk/research/players/srs_player/release/srs_player.swf b/trunk/research/players/srs_player/release/srs_player.swf
index 69e20cfb1..02f1ae84c 100755
Binary files a/trunk/research/players/srs_player/release/srs_player.swf and b/trunk/research/players/srs_player/release/srs_player.swf differ
diff --git a/trunk/research/players/srs_player/src/srs_player.as b/trunk/research/players/srs_player/src/srs_player.as
index 54ddcd651..1f4b3691a 100755
--- a/trunk/research/players/srs_player/src/srs_player.as
+++ b/trunk/research/players/srs_player/src/srs_player.as
@@ -2,13 +2,17 @@ package
 {
     import flash.display.Sprite;
     import flash.display.StageAlign;
+    import flash.display.StageDisplayState;
     import flash.display.StageScaleMode;
     import flash.events.Event;
+    import flash.events.FullScreenEvent;
+    import flash.events.MouseEvent;
     import flash.events.NetStatusEvent;
     import flash.external.ExternalInterface;
     import flash.media.Video;
     import flash.net.NetConnection;
     import flash.net.NetStream;
+    import flash.system.Security;
     import flash.ui.ContextMenu;
     import flash.ui.ContextMenuItem;
     import flash.utils.setTimeout;
@@ -23,18 +27,29 @@ package
         
         // play param url.
         private var url:String = null;
-        // play param, user set width
+        // play param, user set width and height
         private var w:int = 0;
-        // play param, user set height.
         private var h:int = 0;
+        // user set dar den:num
+        private var dar_num:int = 0;
+        private var dar_den:int = 0;
+        // user set fs(fullscreen) refer and percent.
+        private var fs_refer:String = null;
+        private var fs_percent:int = 0;
         
         private var conn:NetConnection = null;
         private var stream:NetStream = null;
         private var video:Video = null;
         private var metadata:Object = {};
         
+        // flash donot allow js to set to fullscreen,
+        // only allow user click to enter fullscreen.
+        private var fs_mask:Sprite = new Sprite();
+        
         public function srs_player()
         {
+            flash.system.Security.allowDomain("*");
+            
             if (!this.stage) {
                 this.addEventListener(Event.ADDED_TO_STAGE, this.onAddToStage);
             } else {
@@ -46,6 +61,12 @@ package
             this.stage.align = StageAlign.TOP_LEFT;
             this.stage.scaleMode = StageScaleMode.NO_SCALE;
             
+            this.stage.addEventListener(FullScreenEvent.FULL_SCREEN, this.on_stage_fullscreen);
+            
+            this.addChild(this.fs_mask);
+            this.fs_mask.buttonMode = true;
+            this.fs_mask.addEventListener(MouseEvent.CLICK, on_user_click_video);
+            
             this.contextMenu = new ContextMenu();
             this.contextMenu.hideBuiltInItems();
             
@@ -62,13 +83,21 @@ package
             this.on_player_ready = flashvars.on_player_ready;
             this.on_player_metadata = flashvars.on_player_metadata;
             
-            flash.utils.setTimeout(this.onJsReady, 0);
+            flash.utils.setTimeout(this.on_js_ready, 0);
         }
         
-        private function onJsReady():void {
+        private function on_stage_fullscreen(evt:FullScreenEvent):void {
+            if (!evt.fullScreen) {
+                execute_user_set_dar();
+            } else {
+                execute_user_enter_fullscreen();
+            }
+        }
+        
+        private function on_js_ready():void {
             if (!flash.external.ExternalInterface.available) {
                 trace("js not ready, try later.");
-                flash.utils.setTimeout(this.onJsReady, 100);
+                flash.utils.setTimeout(this.on_js_ready, 100);
                 return;
             }
             
@@ -77,6 +106,7 @@ package
             flash.external.ExternalInterface.addCallback("__pause", this.js_call_pause);
             flash.external.ExternalInterface.addCallback("__resume", this.js_call_resume);
             flash.external.ExternalInterface.addCallback("__dar", this.js_call_dar);
+            flash.external.ExternalInterface.addCallback("__set_fs", this.js_call_set_fs_size);
             
             var code:int = flash.external.ExternalInterface.call(this.on_player_ready, this.id);
             if (code != 0) {
@@ -84,14 +114,14 @@ package
             }
         }
         
-        public function js_call_pause():int {
+        private function js_call_pause():int {
             if (this.stream) {
                 this.stream.pause();
             }
             return 0;
         }
         
-        public function js_call_resume():int {
+        private function js_call_resume():int {
             if (this.stream) {
                 this.stream.resume();
             }
@@ -99,34 +129,54 @@ package
         }
         
         /**
-        * to set the DAR, for example, DAR=16:9
-        * @param num, for example, 9.
-        * @param den, for example, 16.
+         * to set the DAR, for example, DAR=16:9
+         * @param num, for example, 9. 
+         *       use metadata height if 0.
+         *       use user specified height if -1.
+         * @param den, for example, 16. 
+         *       use metadata width if 0.
+         *       use user specified width if -1.
+         */
+        private function js_call_dar(num:int, den:int):int {
+            dar_num = num;
+            dar_den = den;
+            
+            flash.utils.setTimeout(execute_user_set_dar, 0);
+            return 0;
+        }
+        
+        /**
+         * set the fullscreen size data.
+         * @refer the refer fullscreen mode. it can be:
+         *       video: use video orignal size.
+         *       screen: use screen size to rescale video.
+         * @param percent, the rescale percent, where
+         *       100 means 100%.
+         */
+        private function js_call_set_fs_size(refer:String, percent:int):int {
+            fs_refer = refer;
+            fs_percent = percent;
+            
+            return 0;
+        }
+        /**
+        * js cannot enter the fullscreen mode, user must click to.
         */
-        public function js_call_dar(num:int, den:int):int {
-            if (this.video && num > 0 && den > 0 && this.video.width > 0) {
-                // set DAR.
-                // calc the height by DAR
-                var _height:int = this.w * num / den;
-                if (_height <= this.h) {
-                    this.video.width = this.w;
-                    this.video.height = _height;
-                } else {
-                    // height overflow, calc the width by DAR
-                    var _width:int = this.h * den / num;
-                    
-                    this.video.width = _width;
-                    this.video.height = this.h;
-                }
-                
-                // align center.
-                this.video.y = (this.h - this.video.height) / 2;
-                this.video.x = (this.w - this.video.width) / 2;
+        private function on_user_click_video(evt:MouseEvent):void {
+            if (!this.stage.allowsFullScreen) {
+                trace("donot allow fullscreen.");
+                return;
+            }
+            
+            // enter fullscreen to get the fullscreen size correctly.
+            if (this.stage.displayState == StageDisplayState.FULL_SCREEN) {
+                this.stage.displayState = StageDisplayState.NORMAL;
+            } else {
+                this.stage.displayState = StageDisplayState.FULL_SCREEN;
             }
-            return 0;
         }
         
-        public function js_call_stop():int {
+        private function js_call_stop():int {
             if (this.stream) {
                 this.stream.close();
                 this.stream = null;
@@ -143,17 +193,24 @@ package
             return 0;
         }
         
-        public function js_call_play(url:String, _width:int, _height:int, _buffer_time:Number):int {
+        private function draw_black_background(_width:int, _height:int):void {
+            // draw black bg.
+            this.graphics.beginFill(0x00, 1.0);
+            this.graphics.drawRect(0, 0, _width, _height);
+            this.graphics.endFill();
+            
+            // draw the fs mask.
+            this.fs_mask.graphics.beginFill(0xff0000, 0);
+            this.fs_mask.graphics.drawRect(0, 0, _width, _height);
+            this.fs_mask.graphics.endFill();
+        }
+        
+        private function js_call_play(url:String, _width:int, _height:int, _buffer_time:Number):int {
             this.url = url;
             this.w = _width;
             this.h = _height;
             trace("start to play url: " + this.url + ", w=" + this.w + ", h=" + this.h);
             
-            // draw black bg.
-            this.graphics.beginFill(0x00, 1.0);
-            this.graphics.drawRect(0, 0, this.w, this.h);
-            this.graphics.endFill();
-            
             js_call_stop();
             
             this.conn = new NetConnection();
@@ -184,6 +241,11 @@ package
                 video.attachNetStream(stream);
                 video.smoothing = true;
                 addChild(video);
+                
+                draw_black_background(_width, _height);
+                
+                // lowest layer, for mask to cover it.
+                setChildIndex(video, 0);
             });
             this.conn.connect(this.url.substr(0, this.url.lastIndexOf("/")));
             
@@ -204,13 +266,37 @@ package
             contextMenu.customItems = customItems;
             
             // for js.
+            var obj:Object = get_video_size_object();
+            
+            obj.server = 'srs';
+            obj.contributor = 'winlin';
+            
+            if (metadata.hasOwnProperty("server")) {
+                obj.server = metadata.server;
+            }
+            if (metadata.hasOwnProperty("contributor")) {
+                obj.contributor = metadata.contributor;
+            }
+            
+            var code:int = flash.external.ExternalInterface.call(on_player_metadata, id, obj);
+            if (code != 0) {
+                throw new Error("callback on_player_metadata failed. code=" + code);
+            }
+        }
+        
+        /**
+        * get the "right" size of video,
+        * 1. initialize with the original video object size.
+        * 2. override with metadata size if specified.
+        * 3. override with codec size if specified.
+        */
+        private function get_video_size_object():Object {
             var obj:Object = {
                 width: video.width,
-                    height: video.height,
-                    server: 'srs',
-                    contributor: 'winlin'
+                height: video.height
             };
             
+            // override with metadata size.
             if (metadata.hasOwnProperty("width")) {
                 obj.width = metadata.width;
             }
@@ -218,6 +304,7 @@ package
                 obj.height = metadata.height;
             }
             
+            // override with codec size.
             if (video.videoWidth > 0) {
                 obj.width = video.videoWidth;
             }
@@ -225,17 +312,110 @@ package
                 obj.height = video.videoHeight;
             }
             
-            if (metadata.hasOwnProperty("server")) {
-                obj.server = metadata.server;
+            return obj;
+        }
+        
+        /**
+        * execute the enter fullscreen action.
+        */
+        private function execute_user_enter_fullscreen():void {
+            if (!fs_refer || fs_percent <= 0) {
+                return;
             }
-            if (metadata.hasOwnProperty("contributor")) {
-                obj.contributor = metadata.contributor;
+            
+            // change to video size if refer to video.
+            var obj:Object = get_video_size_object();
+            
+            // get the DAR
+            var num:int = dar_num;
+            var den:int = dar_den;
+            
+            if (num == 0) {
+                num = obj.height;
+            }
+            if (num == -1) {
+                num = this.stage.fullScreenHeight;
             }
             
-            var code:int = flash.external.ExternalInterface.call(on_player_metadata, id, obj);
-            if (code != 0) {
-                throw new Error("callback on_player_metadata failed. code=" + code);
+            if (den == 0) {
+                den = obj.width;
+            }
+            if (den == -1) {
+                den = this.stage.fullScreenWidth;
+            }
+                
+            // for refer is screen.
+            if (fs_refer == "screen") {
+                obj = {
+                    width: this.stage.fullScreenWidth,
+                    height: this.stage.fullScreenHeight
+                };
             }
+            
+            // rescale to fs
+            update_video_size(num, den, obj.width * fs_percent / 100, obj.height * fs_percent / 100, this.stage.fullScreenWidth, this.stage.fullScreenHeight);
+        }
+        
+        /**
+         * for user set dar, or leave fullscreen to recover the dar.
+         */
+        private function execute_user_set_dar():void {
+            // get the DAR
+            var num:int = dar_num;
+            var den:int = dar_den;
+            
+            var obj:Object = get_video_size_object();
+            
+            if (num == 0) {
+                num = obj.height;
+            }
+            if (num == -1) {
+                num = this.h;
+            }
+            
+            if (den == 0) {
+                den = obj.width;
+            }
+            if (den == -1) {
+                den = this.w;
+            }
+            
+            update_video_size(num, den, this.w, this.h, this.w, this.h);
+        }
+        
+        /**
+        * update the video width and height, 
+        * according to the specifies DAR(den:num) and max size(w:h).
+        * set the position of video(x,y) specifies by size(sw:sh),
+        * and update the bg to size(sw:sh).
+        * @param _num/_den the DAR. use to rescale the player together with paper size.
+        * @param _w/_h the video draw paper size. used to rescale the player together with DAR.
+        * @param _sw/_wh the stage size, >= paper size. used to center the player.
+        */
+        private function update_video_size(_num:int, _den:int, _w:int, _h:int, _sw:int, _sh:int):void {
+            if (!this.video || _num <= 0 || _den <= 0) {
+                return;
+            }
+            
+            // set DAR.
+            // calc the height by DAR
+            var _height:int = _w * _num / _den;
+            if (_height <= _h) {
+                this.video.width = _w;
+                this.video.height = _height;
+            } else {
+                // height overflow, calc the width by DAR
+                var _width:int = _h * _den / _num;
+                
+                this.video.width = _width;
+                this.video.height = _h;
+            }
+            
+            // align center.
+            this.video.x = (_sw - this.video.width) / 2;
+            this.video.y = (_sh - this.video.height) / 2;
+            
+            draw_black_background(_sw, _sh);
         }
     }
 }
\ No newline at end of file