From a993dd40b64c8729f298dd1af055eab2d590a58b Mon Sep 17 00:00:00 2001
From: Vivia Nikolaidou <vivia@toolsonair.com>
Date: Wed, 18 May 2016 19:30:52 +0300
Subject: [PATCH] timeoverlay: Add support to display timecode

Choosing time-mode=time-code will display the time code attached to the
buffer, or 00:00:00:00 if no time code is found.

https://bugzilla.gnome.org/show_bug.cgi?id=766419
---
 ext/pango/gsttimeoverlay.c | 63 ++++++++++++++++++++++++++++------------------
 ext/pango/gsttimeoverlay.h |  3 ++-
 2 files changed, 40 insertions(+), 26 deletions(-)

diff --git a/ext/pango/gsttimeoverlay.c b/ext/pango/gsttimeoverlay.c
index 0cedd66..da943e7 100644
--- a/ext/pango/gsttimeoverlay.c
+++ b/ext/pango/gsttimeoverlay.c
@@ -74,6 +74,7 @@ gst_time_overlay_time_line_type (void)
     {GST_TIME_OVERLAY_TIME_LINE_BUFFER_TIME, "buffer-time", "buffer-time"},
     {GST_TIME_OVERLAY_TIME_LINE_STREAM_TIME, "stream-time", "stream-time"},
     {GST_TIME_OVERLAY_TIME_LINE_RUNNING_TIME, "running-time", "running-time"},
+    {GST_TIME_OVERLAY_TIME_LINE_TIME_CODE, "time-code", "time-code"},
     {0, NULL, NULL},
   };
 
@@ -105,39 +106,51 @@ gst_time_overlay_get_text (GstBaseTextOverlay * overlay,
     GstBuffer * video_frame)
 {
   GstTimeOverlayTimeLine time_line;
-  GstClockTime ts, ts_buffer;
-  GstSegment *segment = &overlay->segment;
   gchar *time_str, *txt, *ret;
 
   overlay->need_render = TRUE;
 
-  ts_buffer = GST_BUFFER_TIMESTAMP (video_frame);
-
-  if (!GST_CLOCK_TIME_IS_VALID (ts_buffer)) {
-    GST_DEBUG ("buffer without valid timestamp");
-    return g_strdup ("");
-  }
-
-  GST_DEBUG ("buffer with timestamp %" GST_TIME_FORMAT,
-      GST_TIME_ARGS (ts_buffer));
-
   time_line = g_atomic_int_get (&GST_TIME_OVERLAY_CAST (overlay)->time_line);
-  switch (time_line) {
-    case GST_TIME_OVERLAY_TIME_LINE_STREAM_TIME:
-      ts = gst_segment_to_stream_time (segment, GST_FORMAT_TIME, ts_buffer);
-      break;
-    case GST_TIME_OVERLAY_TIME_LINE_RUNNING_TIME:
-      ts = gst_segment_to_running_time (segment, GST_FORMAT_TIME, ts_buffer);
-      break;
-    case GST_TIME_OVERLAY_TIME_LINE_BUFFER_TIME:
-    default:
-      ts = ts_buffer;
-      break;
+  if (time_line == GST_TIME_OVERLAY_TIME_LINE_TIME_CODE) {
+    GstVideoTimeCodeMeta *tc_meta =
+        gst_buffer_get_video_time_code_meta (video_frame);
+    if (!tc_meta) {
+      GST_DEBUG ("buffer without valid timecode");
+      return g_strdup ("00:00:00:00");
+    }
+    time_str = gst_video_time_code_to_string (&tc_meta->tc);
+    GST_DEBUG ("buffer with timecode %s", time_str);
+  } else {
+    GstClockTime ts, ts_buffer;
+    GstSegment *segment = &overlay->segment;
+
+    ts_buffer = GST_BUFFER_TIMESTAMP (video_frame);
+
+    if (!GST_CLOCK_TIME_IS_VALID (ts_buffer)) {
+      GST_DEBUG ("buffer without valid timestamp");
+      return g_strdup ("");
+    }
+
+    GST_DEBUG ("buffer with timestamp %" GST_TIME_FORMAT,
+        GST_TIME_ARGS (ts_buffer));
+
+    switch (time_line) {
+      case GST_TIME_OVERLAY_TIME_LINE_STREAM_TIME:
+        ts = gst_segment_to_stream_time (segment, GST_FORMAT_TIME, ts_buffer);
+        break;
+      case GST_TIME_OVERLAY_TIME_LINE_RUNNING_TIME:
+        ts = gst_segment_to_running_time (segment, GST_FORMAT_TIME, ts_buffer);
+        break;
+      case GST_TIME_OVERLAY_TIME_LINE_BUFFER_TIME:
+      default:
+        ts = ts_buffer;
+        break;
+    }
+
+    time_str = gst_time_overlay_render_time (GST_TIME_OVERLAY (overlay), ts);
   }
-
   txt = g_strdup (overlay->default_text);
 
-  time_str = gst_time_overlay_render_time (GST_TIME_OVERLAY (overlay), ts);
   if (txt != NULL && *txt != '\0') {
     ret = g_strdup_printf ("%s %s", txt, time_str);
   } else {
diff --git a/ext/pango/gsttimeoverlay.h b/ext/pango/gsttimeoverlay.h
index f895200..f633a05 100644
--- a/ext/pango/gsttimeoverlay.h
+++ b/ext/pango/gsttimeoverlay.h
@@ -44,7 +44,8 @@ typedef struct _GstTimeOverlayClass GstTimeOverlayClass;
 typedef enum {
   GST_TIME_OVERLAY_TIME_LINE_BUFFER_TIME,
   GST_TIME_OVERLAY_TIME_LINE_STREAM_TIME,
-  GST_TIME_OVERLAY_TIME_LINE_RUNNING_TIME
+  GST_TIME_OVERLAY_TIME_LINE_RUNNING_TIME,
+  GST_TIME_OVERLAY_TIME_LINE_TIME_CODE
 } GstTimeOverlayTimeLine;
 
 /**
-- 
2.7.4