for #340, refine ts prefix code.

@@ -526,6 +526,13 @@ vhost with-hls.srs.com {
         # in a word, the hls_path is for vhost.
         # default: ./objs/nginx/html
         hls_path        ./objs/nginx/html;
+        # the hls entry prefix, which is base url of ts url.
+        # if specified, the ts path in m3u8 will be like:
+        #         http://your-server/live/livestream-0.ts
+        #         http://your-server/live/livestream-1.ts
+        #         ...
+        # optional, default to empty string.
+        hls_entry_prefix http://your-server/;
         # the hls mount for hls_storage ram,
         # which use srs embeded http server to delivery HLS,
         # where the mount specifies the HTTP url to mount.

@@ -9,7 +9,7 @@ vhost __defaultVhost__ {
         enabled         on;
         hls_fragment    10;
         hls_window      60;
-#        hls_entry_prefix http://127.0.0.1/;
+        # hls_entry_prefix http://127.0.0.1/;
         hls_path        ./objs/nginx/html;
     }
 }

@@ -3152,7 +3152,17 @@ string SrsConfig::get_hls_entry_prefix(string vhost)
         return "";
     }
 
-    return conf->arg0();
+    std::string hls_entry_prefix = conf->arg0();
+    if (hls_entry_prefix.empty()) {
+        return "";
+    }
+
+    char last_char = hls_entry_prefix[hls_entry_prefix.length() - 1];
+    if (last_char != '/') {
+        hls_entry_prefix.append("/");
+    }
+
+    return hls_entry_prefix;
 }
 
 string SrsConfig::get_hls_path(string vhost)

@@ -203,14 +203,14 @@ int SrsHlsMuxer::sequence_no()
     return _sequence_no;
 }
 
-int SrsHlsMuxer::update_config(SrsRequest* r, string _entry_prefix, string path, int fragment, int window) 
+int SrsHlsMuxer::update_config(SrsRequest* r, string hls_entry_prefix, string path, int fragment, int window) 
 {
     int ret = ERROR_SUCCESS;
     
     srs_freep(req);
     req = r->copy();
 
-    entry_prefix = _entry_prefix;
+    entry_prefix = hls_entry_prefix;
     hls_path = path;
     hls_fragment = fragment;
     hls_window = window;

@@ -208,7 +208,7 @@ public:
     /**
     * when publish, update the config for muxer.
     */
-    virtual int update_config(SrsRequest* r, std::string _entry_prefix, std::string path, int fragment, int window);
+    virtual int update_config(SrsRequest* r, std::string hls_entry_prefix, std::string path, int fragment, int window);
     /**
     * open a new segment(a new ts file),
     * @param segment_start_dts use to calc the segment duration,