diff --git a/trunk/src/app/srs_app_dash.cpp b/trunk/src/app/srs_app_dash.cpp
index 06c0b1f89..40e79b107 100644
--- a/trunk/src/app/srs_app_dash.cpp
+++ b/trunk/src/app/srs_app_dash.cpp
@@ -28,19 +28,45 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <srs_app_config.hpp>
 #include <srs_rtmp_stack.hpp>
 
-SrsMpegDash::SrsMpegDash()
+SrsFragmentedMp4::SrsFragmentedMp4()
+{
+}
+
+SrsFragmentedMp4::~SrsFragmentedMp4()
+{
+}
+
+SrsMpdWriter::SrsMpdWriter()
+{
+}
+
+SrsMpdWriter::~SrsMpdWriter()
+{
+}
+
+SrsDashController::SrsDashController()
+{
+}
+
+SrsDashController::~SrsDashController()
+{
+}
+
+SrsDash::SrsDash()
 {
     hub = NULL;
     req = NULL;
+    controller = new SrsDashController();
     
     enabled = false;
 }
 
-SrsMpegDash::~SrsMpegDash()
+SrsDash::~SrsDash()
 {
+    srs_freep(controller);
 }
 
-int SrsMpegDash::initialize(SrsOriginHub* h, SrsRequest* r)
+int SrsDash::initialize(SrsOriginHub* h, SrsRequest* r)
 {
     int ret = ERROR_SUCCESS;
     
@@ -50,7 +76,7 @@ int SrsMpegDash::initialize(SrsOriginHub* h, SrsRequest* r)
     return ret;
 }
 
-int SrsMpegDash::on_publish()
+int SrsDash::on_publish()
 {
     int ret = ERROR_SUCCESS;
     
@@ -68,7 +94,7 @@ int SrsMpegDash::on_publish()
     return ret;
 }
 
-int SrsMpegDash::on_audio(SrsSharedPtrMessage* shared_audio, SrsFormat* format)
+int SrsDash::on_audio(SrsSharedPtrMessage* shared_audio, SrsFormat* format)
 {
     int ret = ERROR_SUCCESS;
     
@@ -79,7 +105,7 @@ int SrsMpegDash::on_audio(SrsSharedPtrMessage* shared_audio, SrsFormat* format)
     return ret;
 }
 
-int SrsMpegDash::on_video(SrsSharedPtrMessage* shared_video, SrsFormat* format)
+int SrsDash::on_video(SrsSharedPtrMessage* shared_video, SrsFormat* format)
 {
     int ret = ERROR_SUCCESS;
     
@@ -90,7 +116,7 @@ int SrsMpegDash::on_video(SrsSharedPtrMessage* shared_video, SrsFormat* format)
     return ret;
 }
 
-void SrsMpegDash::on_unpublish()
+void SrsDash::on_unpublish()
 {
     // Prevent duplicated unpublish.
     if (!enabled) {
diff --git a/trunk/src/app/srs_app_dash.hpp b/trunk/src/app/srs_app_dash.hpp
index 7fc18b9fc..9b1456e90 100644
--- a/trunk/src/app/srs_app_dash.hpp
+++ b/trunk/src/app/srs_app_dash.hpp
@@ -35,25 +35,49 @@ class SrsSharedPtrMessage;
 class SrsFormat;
 
 /**
+ * The FMP4(Fragmented MP4) for DASH streaming.
  */
 class SrsFragmentedMp4
 {
 public:
+    SrsFragmentedMp4();
+    virtual ~SrsFragmentedMp4();
+};
+
+/**
+ * The writer to write MPD for DASH.
+ */
+class SrsMpdWriter
+{
+public:
+    SrsMpdWriter();
+    virtual ~SrsMpdWriter();
+};
+
+/**
+ * The controller for DASH, control the MPD and FMP4 generating system.
+ */
+class SrsDashController
+{
+public:
+    SrsDashController();
+    virtual ~SrsDashController();
 };
 
 /**
  * The MPEG-DASH encoder, transmux RTMP to DASH.
  */
-class SrsMpegDash
+class SrsDash
 {
 private:
     bool enabled;
 private:
     SrsRequest* req;
     SrsOriginHub* hub;
+    SrsDashController* controller;
 public:
-    SrsMpegDash();
-    virtual ~SrsMpegDash();
+    SrsDash();
+    virtual ~SrsDash();
 public:
     // Initalize the encoder.
     virtual int initialize(SrsOriginHub* h, SrsRequest* r);
@@ -68,3 +92,4 @@ public:
 };
 
 #endif
+
diff --git a/trunk/src/app/srs_app_source.cpp b/trunk/src/app/srs_app_source.cpp
index 672c72b70..b28b9f2e0 100755
--- a/trunk/src/app/srs_app_source.cpp
+++ b/trunk/src/app/srs_app_source.cpp
@@ -845,7 +845,7 @@ SrsOriginHub::SrsOriginHub()
     is_active = false;
     
     hls = new SrsHls();
-    dash = new SrsMpegDash();
+    dash = new SrsDash();
     dvr = new SrsDvr();
 #ifdef SRS_AUTO_TRANSCODE
     encoder = new SrsEncoder();
diff --git a/trunk/src/app/srs_app_source.hpp b/trunk/src/app/srs_app_source.hpp
index 4786337b2..b4d5ad3c1 100644
--- a/trunk/src/app/srs_app_source.hpp
+++ b/trunk/src/app/srs_app_source.hpp
@@ -57,7 +57,7 @@ class SrsConnection;
 class SrsMessageHeader;
 class SrsHls;
 class SrsDvr;
-class SrsMpegDash;
+class SrsDash;
 #ifdef SRS_AUTO_TRANSCODE
 class SrsEncoder;
 #endif
@@ -427,7 +427,7 @@ private:
     // hls handler.
     SrsHls* hls;
     // The DASH encoder.
-    SrsMpegDash* dash;
+    SrsDash* dash;
     // dvr handler.
     SrsDvr* dvr;
     // transcoding handler.