move the ts buffer to http message

@@ -515,6 +515,7 @@ SrsHttpMessage::SrsHttpMessage()
     _uri = new SrsHttpUri();
     _match = NULL;
     _requires_crossdomain = false;
+    _http_ts_send_buffer = new char[HTTP_TS_SEND_BUFFER_SIZE];
 }
 
 SrsHttpMessage::~SrsHttpMessage()
@@ -522,6 +523,12 @@ SrsHttpMessage::~SrsHttpMessage()
     srs_freep(_body);
     srs_freep(_uri);
     srs_freep(_match);
+    srs_freepa(_http_ts_send_buffer);
+}
+
+char* SrsHttpMessage::http_ts_send_buffer()
+{
+    return _http_ts_send_buffer;
 }
 
 void SrsHttpMessage::reset()

@@ -145,6 +145,9 @@ class SrsHttpHandler;
 #define HTTP_GatewayTimeout_str                     "Gateway Timeout"
 #define HTTP_HTTPVersionNotSupported_str            "HTTP Version Not Supported"
 
+// @see SrsHttpMessage._http_ts_send_buffer
+#define HTTP_TS_SEND_BUFFER_SIZE 4096
+
 // linux path seprator
 #define __PATH_SEP '/'
 // query string seprator
@@ -310,10 +313,15 @@ private:
     * whether the message requires crossdomain.
     */
     bool _requires_crossdomain;
+    /**
+    * use a buffer to read and send ts file.
+    */
+    char* _http_ts_send_buffer;
 public:
     SrsHttpMessage();
     virtual ~SrsHttpMessage();
 public:
+    virtual char* http_ts_send_buffer();
     virtual void reset();
     virtual int parse_uri();
 public:

@@ -195,14 +195,12 @@ int SrsHttpVhost::do_process_request(SrsSocket* skt, SrsHttpMessage* req)
         
         // write body.
         int64_t left = length;
-        const static int HTTP_PKT_SIZE = 4096;
-        char* buf = new char[HTTP_PKT_SIZE];
-        SrsAutoFree(char, buf, true);
+        char* buf = req->http_ts_send_buffer();
         
         while (left > 0) {
             ssize_t nread = -1;
             // TODO: FIXME: use st_read.
-            if ((nread = ::read(fd, buf, HTTP_PKT_SIZE)) < 0) {
+            if ((nread = ::read(fd, buf, HTTP_TS_SEND_BUFFER_SIZE)) < 0) {
                 ::close(fd);
                 ret = ERROR_HTTP_READ_FILE;
                 srs_warn("read file %s failed, ret=%d", fullpath.c_str(), ret);