for #299, srs http server support dash, flash request range in range or bytes.

@@ -134,6 +134,14 @@ http_server {
 }
 
 #############################################################################################
+# Streamer sections
+#############################################################################################
+# the streamer cast stream from other protocol to SRS over RTMP.
+# @see https://github.com/winlinvip/simple-rtmp-server/tree/develop#stream-architecture
+streamer {
+}
+
+#############################################################################################
 # RTMP/HTTP VHOST sections
 #############################################################################################
 # vhost list, the __defaultVhost__ is the default vhost

@@ -317,6 +317,40 @@ int SrsGoHttpFileServer::serve_http(ISrsGoHttpResponseWriter* w, SrsHttpMessage*
         }
         
         return serve_flv_stream(w, r, fullpath, offset);
+    } else if (srs_string_ends_with(fullpath, ".mp4")) {
+        // for flash to request mp4 range in query string.
+        // for example, http://digitalprimates.net/dash/DashTest.html?url=http://dashdemo.edgesuite.net/digitalprimates/nexus/oops-20120802-manifest.mpd
+        std::string range = r->query_get("range");
+        // or, use bytes to request range,
+        // for example, http://dashas.castlabs.com/demo/try.html
+        if (range.empty()) {
+            range = r->query_get("bytes");
+        }
+
+        // rollback to serve whole file.
+        size_t pos = string::npos;
+        if (range.empty() || (pos = range.find("-")) == string::npos) {
+            return serve_file(w, r, fullpath);
+        }
+
+        // parse the start in query string
+        int start = 0;
+        if (pos > 0) {
+            start = ::atoi(range.substr(0, pos).c_str());
+        }
+
+        // parse end in query string.
+        int end = -1;
+        if (pos < range.length() - 1) {
+            end = ::atoi(range.substr(pos + 1).c_str());
+        }
+
+        // invalid param, serve as whole mp4 file.
+        if (start < 0 || (end != -1 && start > end)) {
+            return serve_file(w, r, fullpath);
+        }
+        
+        return serve_mp4_range(w, r, fullpath, start, end);
     }
 
     // serve common static file.
@@ -377,7 +411,7 @@ int SrsGoHttpFileServer::serve_file(ISrsGoHttpResponseWriter* w, SrsHttpMessage*
         }
         
         if (_mime.find(ext) == _mime.end()) {
-            w->header()->set_content_type("text/html;charset=utf-8");
+            w->header()->set_content_type("application/octet-stream");
         } else {
             w->header()->set_content_type(_mime[ext]);
         }
@@ -398,6 +432,11 @@ int SrsGoHttpFileServer::serve_flv_stream(ISrsGoHttpResponseWriter* w, SrsHttpMe
     return serve_file(w, r, fullpath);
 }
 
+int SrsGoHttpFileServer::serve_mp4_range(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r, string fullpath, int start, int end)
+{
+    return serve_file(w, r, fullpath);
+}
+
 int SrsGoHttpFileServer::copy(ISrsGoHttpResponseWriter* w, SrsFileReader* fs, SrsHttpMessage* r, int size)
 {
     int ret = ERROR_SUCCESS;
@@ -407,7 +446,8 @@ int SrsGoHttpFileServer::copy(ISrsGoHttpResponseWriter* w, SrsFileReader* fs, Sr
     
     while (left > 0) {
         ssize_t nread = -1;
-        if ((ret = fs->read(buf, __SRS_HTTP_TS_SEND_BUFFER_SIZE, &nread)) != ERROR_SUCCESS) {
+        int max_read = srs_min(left, __SRS_HTTP_TS_SEND_BUFFER_SIZE);
+        if ((ret = fs->read(buf, max_read, &nread)) != ERROR_SUCCESS) {
             break;
         }
         

@@ -213,13 +213,20 @@ public:
     virtual int serve_http(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r);
 protected:
     /**
-    * serve the file by specified path.
+    * serve the file by specified path
     */
     virtual int serve_file(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r, std::string fullpath);
     /**
-    * when access flv file with start=xxx.
+    * when access flv file with x.flv?start=xxx
     */
     virtual int serve_flv_stream(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r, std::string fullpath, int offset);
+    /**
+    * when access mp4 file with x.mp4?range=start-end
+    * @param start the start offset in bytes.
+    * @param end the end offset in bytes. -1 to end of file.
+    * @remark response data in [start, end].
+    */
+    virtual int serve_mp4_range(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r, std::string fullpath, int start, int end);
 protected:
     /**
     * copy the fs to response writer in size bytes.

@@ -141,6 +141,59 @@ int SrsVodStream::serve_flv_stream(ISrsGoHttpResponseWriter* w, SrsHttpMessage*
     return ret;
 }
 
+int SrsVodStream::serve_mp4_range(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r, string fullpath, int start, int end)
+{
+    int ret = ERROR_SUCCESS;
+
+    srs_assert(start >= 0);
+    srs_assert(end == -1 || end >= 0);
+    
+    SrsFileReader fs;
+    
+    // open flv file
+    if ((ret = fs.open(fullpath)) != ERROR_SUCCESS) {
+        return ret;
+    }
+
+    // parse -1 to whole file.
+    if (end == -1) {
+        end = fs.filesize();
+    }
+    
+    if (end > fs.filesize() || start > end) {
+        ret = ERROR_HTTP_REMUX_OFFSET_OVERFLOW;
+        srs_warn("http mp4 streaming %s overflow. size=%"PRId64", offset=%d, ret=%d", 
+            fullpath.c_str(), fs.filesize(), start, ret);
+        return ret;
+    }
+
+    // seek to data offset, [start, end] for range.
+    int64_t left = end - start + 1;
+
+    // write http header for ts.
+    w->header()->set_content_length(left);
+    w->header()->set_content_type("video/mp4");
+
+    // status code 206 to make dash.as happy.
+    w->write_header(SRS_CONSTS_HTTP_PartialContent);
+
+    // response the content range header.
+    std::stringstream content_range;
+    content_range << "bytes " << start << "-" << end << "/" << fs.filesize();
+    w->header()->set("Content-Range", content_range.str());
+    
+    // write body.
+    fs.lseek(start);
+    
+    // send data
+    if ((ret = copy(w, &fs, r, left)) != ERROR_SUCCESS) {
+        srs_warn("read mp4=%s size=%d failed, ret=%d", fullpath.c_str(), left, ret);
+        return ret;
+    }
+    
+    return ret;
+}
+
 SrsStreamCache::SrsStreamCache(SrsSource* s, SrsRequest* r)
 {
     req = r->copy();

@@ -66,6 +66,7 @@ public:
     virtual ~SrsVodStream();
 protected:
     virtual int serve_flv_stream(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r, std::string fullpath, int offset);
+    virtual int serve_mp4_range(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r, std::string fullpath, int start, int end);
 };
 
 /**