refine dvr, append file when dvr file exists. 2.0.122.

trunk/src/kernel/srs_kernel_file.cpp

@@ -69,6 +69,30 @@ int SrsFileWriter::open(string file)
     return ret;
 }
 
+int SrsFileWriter::open_append(string file)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if (fd > 0) {
+        ret = ERROR_SYSTEM_FILE_ALREADY_OPENED;
+        srs_error("file %s already opened. ret=%d", _file.c_str(), ret);
+        return ret;
+    }
+    
+    int flags = O_APPEND|O_WRONLY;
+    mode_t mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH;
+
+    if ((fd = ::open(file.c_str(), flags, mode)) < 0) {
+        ret = ERROR_SYSTEM_FILE_OPENE;
+        srs_error("open file %s failed. ret=%d", file.c_str(), ret);
+        return ret;
+    }
+    
+    _file = file;
+    
+    return ret;
+}
+
 void SrsFileWriter::close()
 {
     int ret = ERROR_SUCCESS;

trunk/src/kernel/srs_kernel_file.hpp

@@ -47,6 +47,10 @@ public:
     * open file writer, can open then close then open...
     */
     virtual int open(std::string file);
+    /**
+    * open file writer in append mode.
+    */
+    virtual int open_append(std::string file);
     virtual void close();
 public:
     virtual bool is_open();

trunk/src/kernel/srs_kernel_utility.cpp

@@ -230,10 +230,8 @@ int __srs_create_dir_recursively(string dir)
 {
     int ret = ERROR_SUCCESS;
     
-    struct stat st;
-    
     // stat current dir, if exists, return error.
-    if (stat(dir.c_str(), &st) == 0) {
+    if (srs_path_exists(dir)) {
         return ERROR_SYSTEM_DIR_EXISTS;
     }
     
@@ -279,6 +277,18 @@ int srs_create_dir_recursively(string dir)
     return ret;
 }
 
+bool srs_path_exists(std::string path)
+{
+    struct stat st;
+    
+    // stat current dir, if exists, return error.
+    if (stat(path.c_str(), &st) == 0) {
+        return true;
+    }
+
+    return false;
+}
+
 bool srs_avc_startswith_annexb(SrsStream* stream, int* pnb_start_code)
 {
     char* bytes = stream->data() + stream->pos();

trunk/src/kernel/srs_kernel_utility.hpp

@@ -64,6 +64,9 @@ extern bool srs_string_ends_with(std::string str, std::string flag);
 // create dir recursively
 extern int srs_create_dir_recursively(std::string dir);
 
+// whether path exists.
+extern bool srs_path_exists(std::string path);
+
 /**
 * whether stream starts with the avc NALU in "AnnexB" 
 * from H.264-AVC-ISO_IEC_14496-10.pdf, page 211.