GstCaps * download_request_get_caps (DownloadRequest * request);
-gboolean download_request_add_buffer (DownloadRequest *request, GstBuffer *buffer);
+void download_request_add_buffer (DownloadRequest *request, GstBuffer *buffer);
GstBuffer * download_request_take_buffer (DownloadRequest *request);
DownloadRequest * download_request_new (void);