From 92afe79be011c182e697a195fd4e92f8b3a6b65b Mon Sep 17 00:00:00 2001
From: Seungha Yang <seungha@centricular.com>
Date: Mon, 5 Apr 2021 00:34:21 +0900
Subject: clockoverlay: Fix broken string formatting by strftime() on Windows

Like other foobarA variant APIs on Windows, formatted string
by strftime() is ANSI string, not unicode encoded one.
It would be problematic for non-english locale systems.
We should use unicode version API (wcsftime in this case)
whenever it's possible on Windows.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/1107>
---
 ext/pango/gstclockoverlay.c | 29 +++++++++++++++++++++++++++++
 ext/pango/gstclockoverlay.h |  4 ++++
 2 files changed, 33 insertions(+)

diff --git a/ext/pango/gstclockoverlay.c b/ext/pango/gstclockoverlay.c
index ba8e625e6..ea2645b45 100644
--- a/ext/pango/gstclockoverlay.c
+++ b/ext/pango/gstclockoverlay.c
@@ -80,7 +80,11 @@ gst_clock_overlay_render_time (GstClockOverlay * overlay)
 #endif
   struct tm *t;
   time_t now;
+#ifdef G_OS_WIN32
+  gunichar2 buf[256];
+#else
   gchar buf[256];
+#endif
 
   now = time (NULL);
 
@@ -97,9 +101,17 @@ gst_clock_overlay_render_time (GstClockOverlay * overlay)
   if (t == NULL)
     return g_strdup ("--:--:--");
 
+#ifdef G_OS_WIN32
+  if (wcsftime (buf, sizeof (buf), (wchar_t *) overlay->wformat, t) == 0)
+    return g_strdup ("");
+
+  return g_utf16_to_utf8 (buf, -1, NULL, NULL, NULL);
+#else
   if (strftime (buf, sizeof (buf), overlay->format, t) == 0)
     return g_strdup ("");
+
   return g_strdup (buf);
+#endif
 }
 
 /* Called with lock held */
@@ -112,7 +124,10 @@ gst_clock_overlay_get_text (GstBaseTextOverlay * overlay,
 
   txt = g_strdup (overlay->default_text);
 
+  GST_OBJECT_LOCK (overlay);
   time_str = gst_clock_overlay_render_time (clock_overlay);
+  GST_OBJECT_UNLOCK (overlay);
+
   if (txt != NULL && *txt != '\0') {
     ret = g_strdup_printf ("%s %s", txt, time_str);
   } else {
@@ -170,6 +185,8 @@ gst_clock_overlay_finalize (GObject * object)
   g_free (overlay->text);
   overlay->format = NULL;
 
+  g_free (overlay->wformat);
+
   G_OBJECT_CLASS (parent_class)->finalize (object);
 }
 
@@ -188,6 +205,11 @@ gst_clock_overlay_init (GstClockOverlay * overlay)
 
   overlay->format = g_strdup (DEFAULT_PROP_TIMEFORMAT);
 
+#ifdef G_OS_WIN32
+  overlay->wformat =
+      g_utf8_to_utf16 (DEFAULT_PROP_TIMEFORMAT, -1, NULL, NULL, NULL);
+#endif
+
   context = textoverlay->pango_context;
 
   pango_context_set_language (context, pango_language_from_string ("en_US"));
@@ -215,6 +237,13 @@ gst_clock_overlay_set_property (GObject * object, guint prop_id,
     case PROP_TIMEFORMAT:
       g_free (overlay->format);
       overlay->format = g_value_dup_string (value);
+      if (!overlay->format)
+        overlay->format = g_strdup (DEFAULT_PROP_TIMEFORMAT);
+#ifdef G_OS_WIN32
+      g_free (overlay->wformat);
+      overlay->wformat =
+          g_utf8_to_utf16 (overlay->format, -1, NULL, NULL, NULL);
+#endif
       break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
diff --git a/ext/pango/gstclockoverlay.h b/ext/pango/gstclockoverlay.h
index b3f4a43ee..3a52c35ac 100644
--- a/ext/pango/gstclockoverlay.h
+++ b/ext/pango/gstclockoverlay.h
@@ -48,6 +48,10 @@ typedef struct _GstClockOverlayClass GstClockOverlayClass;
 struct _GstClockOverlay {
   GstBaseTextOverlay textoverlay;
   gchar         *format; /* as in strftime () */
+
+  /* for wcsftime */
+  gunichar2     *wformat;
+
   gchar         *text;
 };
 
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