gstreamer 指定有中文的 URI地址,需使用UTF8编码

gstreamer中当指定中文位置(URI地址)时,需指定UTF8编码，以filesrc为例，在src_set_location中有说明

/* we store the filename as received by the application. On Windoes this

* should be UTF8 */

src->filename = g_strdup (location);

src->uri = gst_uri_construct ("file", src->filename);

在用gst_open打开文件时，有如下代码：

static int

gst_open (const gchar * filename, int flags, int mode)

{

#ifdef G_OS_WIN32

wchar_t *wfilename = g_utf8_to_utf16 (filename, -1, NULL, NULL, NULL); //如为WINDOWS平台，从UTF8转为UTF16,因为windows平台内部编码为utf16,Linux平台默认编码为UTF8，不用转换。

int retval;

int save_errno;

if (wfilename == NULL) {

errno = EINVAL;

return -1;

}

static gboolean

gst_file_src_set_location (GstFileSrc * src, const gchar * location)

{

GstState state;

/* the element must be stopped in order to do this */

GST_OBJECT_LOCK (src);

state = GST_STATE (src);

if (state != GST_STATE_READY && state != GST_STATE_NULL)

goto wrong_state;

GST_OBJECT_UNLOCK (src);

g_free (src->filename);

g_free (src->uri);

/* clear the filename if we get a NULL (is that possible?) */

if (location == NULL) {

src->filename = NULL;

src->uri = NULL;

} else {

/* we store the filename as received by the application. On Windoes this

* should be UTF8 */

src->filename = g_strdup (location);

src->uri = gst_uri_construct ("file", src->filename);

}

g_object_notify (G_OBJECT (src), "location");

gst_uri_handler_new_uri (GST_URI_HANDLER (src), src->uri);

return TRUE;

/* ERROR */

wrong_state:

{

g_warning ("Changing the `location' property on filesrc when a file is "

"open is not supported.");

GST_OBJECT_UNLOCK (src);

return FALSE;

}

}

static int

gst_open (const gchar * filename, int flags, int mode)

{

#ifdef G_OS_WIN32

wchar_t *wfilename = g_utf8_to_utf16 (filename, -1, NULL, NULL, NULL);

int retval;

int save_errno;

if (wfilename == NULL) {

errno = EINVAL;

return -1;

}

retval = _wopen (wfilename, flags, mode);

save_errno = errno;

g_free (wfilename);

errno = save_errno;

return retval;

#else

return open (filename, flags, mode);

#endif

}