for bug #277, support flv stream.

@@ -38,6 +38,8 @@ using namespace std;
 #include <srs_kernel_utility.hpp>
 #include <srs_protocol_buffer.hpp>
 #include <srs_kernel_file.hpp>
+#include <srs_kernel_flv.hpp>
+#include <srs_core_autofree.hpp>
 
 #define SRS_DEFAULT_HTTP_PORT 80
 
@@ -284,6 +286,29 @@ int SrsGoHttpFileServer::serve_http(ISrsGoHttpResponseWriter* w, SrsHttpMessage*
 
     string fullpath = dir + "/" + upath;
     
+    if (srs_string_ends_with(fullpath, ".flv") || srs_string_ends_with(fullpath, ".fhv")) {
+        std::string start = r->query_get("start");
+        if (start.empty()) {
+            return serve_file(fullpath, w, r);
+        }
+
+        int offset = ::atoi(start.c_str());
+        if (offset <= 0) {
+            return serve_file(fullpath, w, r);
+        }
+        
+        return serve_flv_stream(fullpath, w, r, offset);
+    } else {
+        return serve_file(fullpath, w, r);
+    }
+    
+    return ret;
+}
+
+int SrsGoHttpFileServer::serve_file(string fullpath, ISrsGoHttpResponseWriter* w, SrsHttpMessage* r)
+{
+    int ret = ERROR_SUCCESS;
+    
     // open the target file.
     SrsFileReader fs;
     
@@ -338,6 +363,98 @@ int SrsGoHttpFileServer::serve_http(ISrsGoHttpResponseWriter* w, SrsHttpMessage*
     return ret;
 }
 
+int SrsGoHttpFileServer::serve_flv_stream(string fullpath, ISrsGoHttpResponseWriter* w, SrsHttpMessage* r, int offset)
+{
+    int ret = ERROR_SUCCESS;
+    
+    SrsFileReader fs;
+    
+    // open flv file
+    if ((ret = fs.open(fullpath)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    if (offset > fs.filesize()) {
+        ret = ERROR_HTTP_FLV_OFFSET_OVERFLOW;
+        srs_warn("http flv streaming %s overflow. size=%"PRId64", offset=%d, ret=%d", 
+            fullpath.c_str(), fs.filesize(), offset, ret);
+        return ret;
+    }
+    
+    SrsFlvVodStreamDecoder ffd;
+    
+    // open fast decoder
+    if ((ret = ffd.initialize(&fs)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    // save header, send later.
+    char flv_header[13];
+    
+    // send flv header
+    if ((ret = ffd.read_header_ext(flv_header)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    // save sequence header, send later
+    char* sh_data = NULL;
+    int sh_size = 0;
+    
+    if (true) {
+        // send sequence header
+        int64_t start = 0;
+        if ((ret = ffd.read_sequence_header_summary(&start, &sh_size)) != ERROR_SUCCESS) {
+            return ret;
+        }
+        if (sh_size <= 0) {
+            ret = ERROR_HTTP_FLV_SEQUENCE_HEADER;
+            srs_warn("http flv streaming no sequence header. size=%d, ret=%d", sh_size, ret);
+            return ret;
+        }
+    }
+    sh_data = new char[sh_size];
+    SrsAutoFree(char, sh_data);
+    if ((ret = fs.read(sh_data, sh_size, NULL)) != ERROR_SUCCESS) {
+        return ret;
+    }
+
+    // seek to data offset
+    int64_t left = fs.filesize() - offset;
+
+    // write http header for ts.
+    w->header()->set_content_length((int)(sizeof(flv_header) + sh_size + left));
+    w->header()->set_content_type("video/x-flv");
+    
+    // write flv header and sequence header.
+    if ((ret = w->write(flv_header, sizeof(flv_header))) != ERROR_SUCCESS) {
+        return ret;
+    }
+    if (sh_size > 0 && (ret = w->write(sh_data, sh_size)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    // write body.
+    char* buf = r->http_ts_send_buffer();
+    if ((ret = ffd.lseek(offset)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    // send data
+    while (left > 0) {
+        ssize_t nread = -1;
+        if ((ret = fs.read(buf, __SRS_HTTP_TS_SEND_BUFFER_SIZE, &nread)) != ERROR_SUCCESS) {
+            return ret;
+        }
+        
+        left -= nread;
+        if ((ret = w->write(buf, nread)) != ERROR_SUCCESS) {
+            return ret;
+        }
+    }
+    
+    return ret;
+}
+
 SrsGoHttpMuxEntry::SrsGoHttpMuxEntry()
 {
     explicit_match = false;

@@ -204,6 +204,9 @@ public:
     virtual ~SrsGoHttpFileServer();
 public:
     virtual int serve_http(ISrsGoHttpResponseWriter* w, SrsHttpMessage* r);
+private:
+    virtual int serve_file(std::string fullpath, ISrsGoHttpResponseWriter* w, SrsHttpMessage* r);
+    virtual int serve_flv_stream(std::string fullpath, ISrsGoHttpResponseWriter* w, SrsHttpMessage* r, int offset);
 };
 
 // the mux entry for server mux.

@@ -38,7 +38,6 @@ using namespace std;
 #include <srs_app_st_socket.hpp>
 #include <srs_core_autofree.hpp>
 #include <srs_app_config.hpp>
-#include <srs_kernel_flv.hpp>
 #include <srs_kernel_utility.hpp>
 
 SrsHttpServer::SrsHttpServer()