diff --git a/trunk/auto/auto_headers.sh b/trunk/auto/auto_headers.sh
index d3165f78a..029613dd7 100755
--- a/trunk/auto/auto_headers.sh
+++ b/trunk/auto/auto_headers.sh
@@ -79,12 +79,6 @@ fi
 echo "" >> $SRS_AUTO_HEADERS_H
 
 # auto headers in depends.
-if [ $SRS_STREAM_CASTER = YES ]; then
-    srs_define_macro "SRS_AUTO_STREAM_CASTER" $SRS_AUTO_HEADERS_H
-else
-    srs_undefine_macro "SRS_AUTO_STREAM_CASTER" $SRS_AUTO_HEADERS_H
-fi
-
 if [ $SRS_KAFKA = YES ]; then
     srs_define_macro "SRS_AUTO_KAFKA" $SRS_AUTO_HEADERS_H
 else
diff --git a/trunk/auto/options.sh b/trunk/auto/options.sh
index 36ad5c5d6..92b8bea04 100755
--- a/trunk/auto/options.sh
+++ b/trunk/auto/options.sh
@@ -18,7 +18,6 @@ help=no
 SRS_HDS=RESERVED
 SRS_NGINX=RESERVED
 SRS_FFMPEG_TOOL=RESERVED
-SRS_STREAM_CASTER=RESERVED
 SRS_KAFKA=RESERVED
 SRS_LIBRTMP=RESERVED
 SRS_RESEARCH=RESERVED
@@ -30,6 +29,7 @@ SRS_GPERF_MP=NO # Performance test: gperf memory profile
 SRS_GPERF_CP=NO # Performance test: gperf cpu profile
 SRS_GPROF=NO # Performance test: gprof
 # Always enable the bellow features.
+SRS_STREAM_CASTER=YES
 SRS_INGEST=YES
 SRS_SSL=YES
 SRS_STAT=YES
@@ -383,7 +383,6 @@ function apply_user_presets() {
         SRS_HDS=NO
         SRS_NGINX=NO
         SRS_FFMPEG_TOOL=NO
-        SRS_STREAM_CASTER=NO
         SRS_KAFKA=NO
         SRS_LIBRTMP=NO
         SRS_RESEARCH=NO
@@ -396,7 +395,6 @@ function apply_user_presets() {
         SRS_HDS=YES
         SRS_NGINX=YES
         SRS_FFMPEG_TOOL=YES
-        SRS_STREAM_CASTER=YES
         SRS_KAFKA=YES
         SRS_LIBRTMP=YES
         SRS_RESEARCH=YES
@@ -409,7 +407,6 @@ function apply_user_presets() {
         SRS_HDS=NO
         SRS_NGINX=NO
         SRS_FFMPEG_TOOL=NO
-        SRS_STREAM_CASTER=NO
         SRS_KAFKA=NO
         SRS_LIBRTMP=NO
         SRS_RESEARCH=NO
@@ -422,7 +419,6 @@ function apply_user_presets() {
         SRS_HDS=NO
         SRS_NGINX=NO
         SRS_FFMPEG_TOOL=NO
-        SRS_STREAM_CASTER=NO
         SRS_KAFKA=NO
         SRS_LIBRTMP=NO
         SRS_RESEARCH=NO
@@ -435,7 +431,6 @@ function apply_user_presets() {
         SRS_HDS=YES
         SRS_NGINX=NO
         SRS_FFMPEG_TOOL=NO
-        SRS_STREAM_CASTER=YES
         SRS_KAFKA=YES
         SRS_LIBRTMP=YES
         SRS_RESEARCH=NO
@@ -449,7 +444,6 @@ function apply_user_presets() {
         SRS_HDS=YES
         SRS_NGINX=NO
         SRS_FFMPEG_TOOL=NO
-        SRS_STREAM_CASTER=YES
         SRS_KAFKA=YES
         SRS_LIBRTMP=YES
         SRS_RESEARCH=NO
@@ -462,7 +456,6 @@ function apply_user_presets() {
         SRS_HDS=YES
         SRS_NGINX=NO
         SRS_FFMPEG_TOOL=NO
-        SRS_STREAM_CASTER=YES
         SRS_KAFKA=YES
         SRS_LIBRTMP=YES
         SRS_RESEARCH=NO
@@ -475,7 +468,6 @@ function apply_user_presets() {
         SRS_HDS=YES
         SRS_NGINX=NO
         SRS_FFMPEG_TOOL=NO
-        SRS_STREAM_CASTER=YES
         SRS_KAFKA=YES
         SRS_LIBRTMP=YES
         SRS_RESEARCH=NO
@@ -491,7 +483,6 @@ function apply_user_presets() {
         SRS_HDS=YES
         SRS_NGINX=NO
         SRS_FFMPEG_TOOL=YES
-        SRS_STREAM_CASTER=YES
         SRS_KAFKA=YES
         SRS_LIBRTMP=YES
         SRS_RESEARCH=YES
@@ -504,7 +495,6 @@ function apply_user_presets() {
         SRS_HDS=YES
         SRS_NGINX=NO
         SRS_FFMPEG_TOOL=NO
-        SRS_STREAM_CASTER=YES
         SRS_KAFKA=YES
         SRS_LIBRTMP=NO
         SRS_RESEARCH=NO
@@ -517,7 +507,6 @@ function apply_user_presets() {
         SRS_HDS=YES
         SRS_NGINX=NO
         SRS_FFMPEG_TOOL=YES
-        SRS_STREAM_CASTER=YES
         SRS_KAFKA=YES
         SRS_LIBRTMP=YES
         SRS_RESEARCH=NO
@@ -530,7 +519,6 @@ function apply_user_presets() {
         SRS_HDS=YES
         SRS_NGINX=NO
         SRS_FFMPEG_TOOL=NO
-        SRS_STREAM_CASTER=YES
         SRS_KAFKA=YES
         SRS_LIBRTMP=YES
         SRS_RESEARCH=NO
@@ -543,7 +531,6 @@ function apply_user_presets() {
         SRS_HDS=YES
         SRS_NGINX=NO
         SRS_FFMPEG_TOOL=YES
-        SRS_STREAM_CASTER=NO
         SRS_KAFKA=YES
         SRS_LIBRTMP=YES
         SRS_RESEARCH=NO
@@ -570,6 +557,7 @@ function apply_user_detail_options() {
 
     # Always enable HTTP utilies.
     if [ $SRS_HTTP_CORE = NO ]; then SRS_HTTP_CORE=YES; echo -e "${YELLOW}[WARN] Always enable HTTP utilies.${BLACK}"; fi
+    if [ $SRS_STREAM_CASTER = NO ]; then SRS_STREAM_CASTER=YES; echo -e "${YELLOW}[WARN] Always enable StreamCaster.${BLACK}"; fi
     if [ $SRS_INGEST = NO ]; then SRS_INGEST=YES; echo -e "${YELLOW}[WARN] Always enable Ingest.${BLACK}"; fi
     if [ $SRS_SSL = NO ]; then SRS_SSL=YES; echo -e "${YELLOW}[WARN] Always enable SSL.${BLACK}"; fi
     if [ $SRS_STAT = NO ]; then SRS_STAT=YES; echo -e "${YELLOW}[WARN] Always enable Statistic.${BLACK}"; fi
diff --git a/trunk/src/app/srs_app_caster_flv.cpp b/trunk/src/app/srs_app_caster_flv.cpp
index 98a7c8520..278a9ed02 100644
--- a/trunk/src/app/srs_app_caster_flv.cpp
+++ b/trunk/src/app/srs_app_caster_flv.cpp
@@ -23,8 +23,6 @@
 
 #include <srs_app_caster_flv.hpp>
 
-#ifdef SRS_AUTO_STREAM_CASTER
-
 #include <algorithm>
 using namespace std;
 
@@ -324,4 +322,3 @@ srs_error_t SrsHttpFileReader::lseek(off_t offset, int whence, off_t* seeked)
     return srs_success;
 }
 
-#endif
diff --git a/trunk/src/app/srs_app_caster_flv.hpp b/trunk/src/app/srs_app_caster_flv.hpp
index 08baa3e1e..d56b773f1 100644
--- a/trunk/src/app/srs_app_caster_flv.hpp
+++ b/trunk/src/app/srs_app_caster_flv.hpp
@@ -29,8 +29,6 @@
 #include <string>
 #include <vector>
 
-#ifdef SRS_AUTO_STREAM_CASTER
-
 class SrsConfDirective;
 class SrsHttpServeMux;
 class SrsRtmpClient;
@@ -126,4 +124,3 @@ public:
 
 #endif
 
-#endif
diff --git a/trunk/src/app/srs_app_http_api.cpp b/trunk/src/app/srs_app_http_api.cpp
index 1c2fa6a86..1739b49fb 100644
--- a/trunk/src/app/srs_app_http_api.cpp
+++ b/trunk/src/app/srs_app_http_api.cpp
@@ -612,11 +612,7 @@ srs_error_t SrsGoApiFeatures::serve_http(ISrsHttpResponseWriter* w, ISrsHttpMess
 #else
     features->set("ffmpeg", SrsJsonAny::boolean(false));
 #endif
-#ifdef SRS_AUTO_STREAM_CASTER
     features->set("caster", SrsJsonAny::boolean(true));
-#else
-    features->set("caster", SrsJsonAny::boolean(false));
-#endif
 #ifdef SRS_PERF_COMPLEX_SEND
     features->set("complex_send", SrsJsonAny::boolean(true));
 #else
diff --git a/trunk/src/app/srs_app_mpegts_udp.cpp b/trunk/src/app/srs_app_mpegts_udp.cpp
index cdc86f476..0035077d2 100644
--- a/trunk/src/app/srs_app_mpegts_udp.cpp
+++ b/trunk/src/app/srs_app_mpegts_udp.cpp
@@ -23,8 +23,6 @@
 
 #include <srs_app_mpegts_udp.hpp>
 
-#ifdef SRS_AUTO_STREAM_CASTER
-
 #include <stdlib.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
@@ -639,4 +637,3 @@ void SrsMpegtsOverUdp::close()
     srs_freep(sdk);
 }
 
-#endif
diff --git a/trunk/src/app/srs_app_mpegts_udp.hpp b/trunk/src/app/srs_app_mpegts_udp.hpp
index e51fb133c..a46e28fd2 100644
--- a/trunk/src/app/srs_app_mpegts_udp.hpp
+++ b/trunk/src/app/srs_app_mpegts_udp.hpp
@@ -26,8 +26,6 @@
 
 #include <srs_core.hpp>
 
-#ifdef SRS_AUTO_STREAM_CASTER
-
 struct sockaddr;
 #include <string>
 #include <map>
@@ -123,4 +121,3 @@ private:
 
 #endif
 
-#endif
diff --git a/trunk/src/app/srs_app_rtsp.cpp b/trunk/src/app/srs_app_rtsp.cpp
index bcbf1f916..97514660d 100644
--- a/trunk/src/app/srs_app_rtsp.cpp
+++ b/trunk/src/app/srs_app_rtsp.cpp
@@ -46,8 +46,6 @@ using namespace std;
 #include <srs_protocol_utility.hpp>
 #include <srs_protocol_format.hpp>
 
-#ifdef SRS_AUTO_STREAM_CASTER
-
 SrsRtpConn::SrsRtpConn(SrsRtspConn* r, int p, int sid)
 {
     rtsp = r;
@@ -746,5 +744,3 @@ void SrsRtspCaster::remove(SrsRtspConn* conn)
     srs_freep(conn);
 }
 
-#endif
-
diff --git a/trunk/src/app/srs_app_rtsp.hpp b/trunk/src/app/srs_app_rtsp.hpp
index 37e72fe52..11d529a1d 100644
--- a/trunk/src/app/srs_app_rtsp.hpp
+++ b/trunk/src/app/srs_app_rtsp.hpp
@@ -34,8 +34,6 @@
 #include <srs_app_thread.hpp>
 #include <srs_app_listener.hpp>
 
-#ifdef SRS_AUTO_STREAM_CASTER
-
 class SrsStSocket;
 class SrsRtspConn;
 class SrsRtspStack;
@@ -214,4 +212,3 @@ public:
 
 #endif
 
-#endif
diff --git a/trunk/src/app/srs_app_server.cpp b/trunk/src/app/srs_app_server.cpp
index 36cb3e055..ab86a86e3 100644
--- a/trunk/src/app/srs_app_server.cpp
+++ b/trunk/src/app/srs_app_server.cpp
@@ -171,7 +171,6 @@ srs_error_t SrsBufferListener::on_tcp_client(srs_netfd_t stfd)
     return srs_success;
 }
 
-#ifdef SRS_AUTO_STREAM_CASTER
 SrsRtspListener::SrsRtspListener(SrsServer* svr, SrsListenerType t, SrsConfDirective* c) : SrsListener(svr, t)
 {
     listener = NULL;
@@ -281,7 +280,6 @@ srs_error_t SrsHttpFlvListener::on_tcp_client(srs_netfd_t stfd)
     
     return err;
 }
-#endif
 
 SrsUdpStreamListener::SrsUdpStreamListener(SrsServer* svr, SrsListenerType t, ISrsUdpHandler* c) : SrsListener(svr, t)
 {
@@ -323,7 +321,6 @@ srs_error_t SrsUdpStreamListener::listen(string i, int p)
     return err;
 }
 
-#ifdef SRS_AUTO_STREAM_CASTER
 SrsUdpCasterListener::SrsUdpCasterListener(SrsServer* svr, SrsListenerType t, SrsConfDirective* c) : SrsUdpStreamListener(svr, t, NULL)
 {
     // the caller already ensure the type is ok,
@@ -338,7 +335,6 @@ SrsUdpCasterListener::~SrsUdpCasterListener()
 {
     srs_freep(caster);
 }
-#endif
 
 SrsSignalManager* SrsSignalManager::instance = NULL;
 
@@ -1096,7 +1092,6 @@ srs_error_t SrsServer::listen_stream_caster()
 {
     srs_error_t err = srs_success;
     
-#ifdef SRS_AUTO_STREAM_CASTER
     close_listeners(SrsListenerMpegTsOverUdp);
     
     std::vector<SrsConfDirective*>::iterator it;
@@ -1134,7 +1129,6 @@ srs_error_t SrsServer::listen_stream_caster()
             return srs_error_wrap(err, "listen at %d", port);
         }
     }
-#endif
     
     return err;
 }
diff --git a/trunk/src/app/srs_app_server.hpp b/trunk/src/app/srs_app_server.hpp
index 283a3ad1c..4b3a74bff 100644
--- a/trunk/src/app/srs_app_server.hpp
+++ b/trunk/src/app/srs_app_server.hpp
@@ -49,9 +49,7 @@ class ISrsTcpHandler;
 class ISrsUdpHandler;
 class SrsUdpListener;
 class SrsTcpListener;
-#ifdef SRS_AUTO_STREAM_CASTER
 class SrsAppCasterFlv;
-#endif
 #ifdef SRS_AUTO_KAFKA
 class SrsKafkaProducer;
 #endif
@@ -111,7 +109,6 @@ public:
     virtual srs_error_t on_tcp_client(srs_netfd_t stfd);
 };
 
-#ifdef SRS_AUTO_STREAM_CASTER
 /**
  * the tcp listener, for rtsp server.
  */
@@ -147,7 +144,6 @@ public:
 public:
     virtual srs_error_t on_tcp_client(srs_netfd_t stfd);
 };
-#endif
 
 /**
  * the udp listener, for udp server.
@@ -167,14 +163,12 @@ public:
 /**
  * the udp listener, for udp stream caster server.
  */
-#ifdef SRS_AUTO_STREAM_CASTER
 class SrsUdpCasterListener : public SrsUdpStreamListener
 {
 public:
     SrsUdpCasterListener(SrsServer* svr, SrsListenerType t, SrsConfDirective* c);
     virtual ~SrsUdpCasterListener();
 };
-#endif
 
 /**
  * convert signal to io,
diff --git a/trunk/src/main/srs_main_server.cpp b/trunk/src/main/srs_main_server.cpp
index a6570f188..aeb867f0f 100644
--- a/trunk/src/main/srs_main_server.cpp
+++ b/trunk/src/main/srs_main_server.cpp
@@ -235,7 +235,7 @@ void show_macro_features()
         // ff(ffmpeg)
         ss << ", ff:" << srs_bool2switch(SRS_AUTO_FFMPEG_TOOL_BOOL);
         // sc(stream-caster)
-        ss << ", sc:" << srs_bool2switch(SRS_AUTO_STREAM_CASTER_BOOL);
+        ss << ", sc:" << srs_bool2switch(true);
         srs_trace(ss.str().c_str());
     }
     
diff --git a/trunk/src/protocol/srs_rtsp_stack.cpp b/trunk/src/protocol/srs_rtsp_stack.cpp
index ac0083d82..42354c26a 100644
--- a/trunk/src/protocol/srs_rtsp_stack.cpp
+++ b/trunk/src/protocol/srs_rtsp_stack.cpp
@@ -39,8 +39,6 @@ using namespace std;
 #include <srs_kernel_buffer.hpp>
 #include <srs_kernel_codec.hpp>
 
-#ifdef SRS_AUTO_STREAM_CASTER
-
 #define SRS_RTSP_BUFFER 4096
 
 // get the status text of code.
@@ -1104,5 +1102,3 @@ srs_error_t SrsRtspStack::recv_token(std::string& token, SrsRtspTokenState& stat
 
 #endif
 
-#endif
-
diff --git a/trunk/src/protocol/srs_rtsp_stack.hpp b/trunk/src/protocol/srs_rtsp_stack.hpp
index 4e785a988..50c2a99a5 100644
--- a/trunk/src/protocol/srs_rtsp_stack.hpp
+++ b/trunk/src/protocol/srs_rtsp_stack.hpp
@@ -33,8 +33,6 @@
 
 #include <srs_kernel_consts.hpp>
 
-#ifdef SRS_AUTO_STREAM_CASTER
-
 class SrsBuffer;
 class SrsSimpleStream;
 class SrsAudioFrame;
@@ -712,5 +710,3 @@ private:
 
 #endif
 
-#endif
-