videotimecode: Init from GDateTime

Add a function to init the time code from a GDateTime

https://bugzilla.gnome.org/show_bug.cgi?id=778702

docs/libs/gst-plugins-base-libs-sections.txt

@@ -2775,6 +2775,7 @@ gst_video_time_code_new_empty
 gst_video_time_code_free
 gst_video_time_code_copy
 gst_video_time_code_init
+gst_video_time_code_init_from_date_time
 gst_video_time_code_clear
 gst_video_time_code_is_valid
 gst_video_time_code_compare
@@ -2786,6 +2787,7 @@ gst_video_time_code_to_date_time
 gst_video_time_code_to_string
 gst_video_time_code_add_interval
 gst_video_time_code_new_from_string
+gst_video_time_code_new_from_date_time
 
 <SUBSECTION>
 GstVideoTimeCodeInterval

gst-libs/gst/video/gstvideotimecode.c

@@ -190,6 +190,55 @@ gst_video_time_code_to_date_time (const GstVideoTimeCode * tc)
   return ret2;
 }
 
+/**
+ * gst_video_time_code_init_from_date_time:
+ * @tc: a #GstVideoTimeCode
+ * @fps_n: Numerator of the frame rate
+ * @fps_d: Denominator of the frame rate
+ * @dt: #GDateTime to convert
+ * @flags: #GstVideoTimeCodeFlags
+ * @field_count: Interlaced video field count
+ *
+ * The resulting config->latest_daily_jam is set to
+ * midnight, and timecode is set to the given time.
+ *
+ * Since: 1.12
+ */
+
+void
+gst_video_time_code_init_from_date_time (GstVideoTimeCode * tc,
+    guint fps_n, guint fps_d,
+    GDateTime * dt, GstVideoTimeCodeFlags flags, guint field_count)
+{
+  GDateTime *jam;
+  guint64 frames;
+
+  jam = g_date_time_new_local (g_date_time_get_year (dt),
+      g_date_time_get_month (dt), g_date_time_get_day_of_month (dt), 0, 0, 0.0);
+
+  /* Note: This might be inaccurate for 1 frame
+   * in case we have a drop frame timecode */
+  frames =
+      gst_util_uint64_scale_round (g_date_time_get_microsecond (dt) *
+      G_GINT64_CONSTANT (1000), fps_n, fps_d * GST_SECOND);
+
+  gst_video_time_code_init (tc, fps_n, fps_d, jam, flags,
+      g_date_time_get_hour (dt), g_date_time_get_minute (dt),
+      g_date_time_get_second (dt), frames, field_count);
+
+  if (tc->config.flags & GST_VIDEO_TIME_CODE_FLAGS_DROP_FRAME) {
+    guint df = (tc->config.fps_n + (tc->config.fps_d >> 1)) /
+        (15 * tc->config.fps_d);
+    if (tc->minutes % 10 && tc->seconds == 0 && tc->frames < df) {
+      tc->frames = df;
+    }
+  }
+
+  g_date_time_unref (jam);
+
+  g_return_if_fail (gst_video_time_code_is_valid (tc));
+}
+
 /**
  * gst_video_time_code_nsec_since_daily_jam:
  * @tc: a #GstVideoTimeCode
@@ -618,6 +667,31 @@ gst_video_time_code_new_from_string (const gchar * tc_str)
   }
 }
 
+/**
+ * gst_video_time_code_new_from_date_time:
+ * @fps_n: Numerator of the frame rate
+ * @fps_d: Denominator of the frame rate
+ * @dt: #GDateTime to convert
+ * @flags: #GstVideoTimeCodeFlags
+ * @field_count: Interlaced video field count
+ *
+ * The resulting config->latest_daily_jam is set to
+ * midnight, and timecode is set to the given time.
+ *
+ * Returns: the #GVideoTimeCode representation of @dt.
+ *
+ * Since: 1.12
+ */
+GstVideoTimeCode *
+gst_video_time_code_new_from_date_time (guint fps_n, guint fps_d,
+    GDateTime * dt, GstVideoTimeCodeFlags flags, guint field_count)
+{
+  GstVideoTimeCode *tc;
+  tc = gst_video_time_code_new_empty ();
+  gst_video_time_code_init_from_date_time (tc, fps_n, fps_d, dt, flags,
+      field_count);
+  return tc;
+}
 
 /**
  * gst_video_time_code_init:

gst-libs/gst/video/gstvideotimecode.h

@@ -135,6 +135,11 @@ GstVideoTimeCode * gst_video_time_code_new          (guint                    fp
                                                      guint                    field_count);
 GstVideoTimeCode * gst_video_time_code_new_empty    (void);
 GstVideoTimeCode * gst_video_time_code_new_from_string    (const gchar * tc_str);
+GstVideoTimeCode * gst_video_time_code_new_from_date_time (guint              fps_n,
+                                                     guint                    fps_d,
+                                                     GDateTime              * dt,
+                                                     GstVideoTimeCodeFlags    flags,
+                                                     guint                    field_count);
 void gst_video_time_code_free                       (GstVideoTimeCode       * tc);
 
 GstVideoTimeCode * gst_video_time_code_copy         (const GstVideoTimeCode * tc);
@@ -149,6 +154,12 @@ void gst_video_time_code_init                       (GstVideoTimeCode       * tc
                                                      guint                    seconds,
                                                      guint                    frames,
                                                      guint                    field_count);
+void gst_video_time_code_init_from_date_time        (GstVideoTimeCode       * tc,
+                                                     guint                    fps_n,
+                                                     guint                    fps_d,
+                                                     GDateTime              * dt,
+                                                     GstVideoTimeCodeFlags    flags,
+                                                     guint                    field_count);
 void gst_video_time_code_clear                      (GstVideoTimeCode       * tc);
 
 gboolean gst_video_time_code_is_valid               (const GstVideoTimeCode * tc);

tests/check/libs/videotimecode.c

@@ -584,6 +584,68 @@ GST_START_TEST (videotimecode_interval)
 
 GST_END_TEST;
 
+GST_START_TEST (videotimecode_from_date_time_1s)
+{
+  GstVideoTimeCode *tc;
+  GDateTime *dt;
+
+  dt = g_date_time_new_local (2017, 2, 16, 0, 0, 1);
+  tc = gst_video_time_code_new_from_date_time (30000, 1001, dt,
+      GST_VIDEO_TIME_CODE_FLAGS_DROP_FRAME, 0);
+
+  fail_unless_equals_int (tc->hours, 0);
+  fail_unless_equals_int (tc->minutes, 0);
+  fail_unless_equals_int (tc->seconds, 1);
+  fail_unless_equals_int (tc->frames, 0);
+
+  gst_video_time_code_free (tc);
+  g_date_time_unref (dt);
+}
+
+GST_END_TEST;
+
+GST_START_TEST (videotimecode_from_date_time_halfsecond)
+{
+  GstVideoTimeCode *tc;
+  GDateTime *dt, *dt2;
+
+  dt = g_date_time_new_local (2017, 2, 17, 14, 13, 0);
+  dt2 = g_date_time_add (dt, 500000);
+  g_date_time_unref (dt);
+  tc = gst_video_time_code_new_from_date_time (30000, 1001, dt2,
+      GST_VIDEO_TIME_CODE_FLAGS_DROP_FRAME, 0);
+
+  fail_unless_equals_int (tc->hours, 14);
+  fail_unless_equals_int (tc->minutes, 13);
+  fail_unless_equals_int (tc->seconds, 0);
+  fail_unless_equals_int (tc->frames, 15);
+
+  gst_video_time_code_free (tc);
+  g_date_time_unref (dt2);
+}
+
+GST_END_TEST;
+
+GST_START_TEST (videotimecode_from_date_time)
+{
+  GstVideoTimeCode *tc;
+  GDateTime *dt;
+
+  dt = g_date_time_new_local (2017, 2, 17, 14, 13, 30);
+  tc = gst_video_time_code_new_from_date_time (30000, 1001, dt,
+      GST_VIDEO_TIME_CODE_FLAGS_DROP_FRAME, 0);
+
+  fail_unless_equals_int (tc->hours, 14);
+  fail_unless_equals_int (tc->minutes, 13);
+  fail_unless_equals_int (tc->seconds, 30);
+  fail_unless_equals_int (tc->frames, 0);
+
+  gst_video_time_code_free (tc);
+  g_date_time_unref (dt);
+}
+
+GST_END_TEST;
+
 static Suite *
 gst_videotimecode_suite (void)
 {
@@ -617,6 +679,10 @@ gst_videotimecode_suite (void)
   tcase_add_test (tc, videotimecode_dailyjam_distance);
   tcase_add_test (tc, videotimecode_serialize_deserialize);
   tcase_add_test (tc, videotimecode_interval);
+
+  tcase_add_test (tc, videotimecode_from_date_time_1s);
+  tcase_add_test (tc, videotimecode_from_date_time_halfsecond);
+  tcase_add_test (tc, videotimecode_from_date_time);
   return s;
 }
 

win32/common/libgstvideo.def

@@ -301,6 +301,7 @@ EXPORTS
 	gst_video_time_code_get_type
 	gst_video_time_code_increment_frame
 	gst_video_time_code_init
+	gst_video_time_code_init_from_date_time
 	gst_video_time_code_interval_clear
 	gst_video_time_code_interval_copy
 	gst_video_time_code_interval_free
@@ -313,6 +314,7 @@ EXPORTS
 	gst_video_time_code_meta_get_info
 	gst_video_time_code_new
 	gst_video_time_code_new_empty
+	gst_video_time_code_new_from_date_time
 	gst_video_time_code_new_from_string
 	gst_video_time_code_nsec_since_daily_jam
 	gst_video_time_code_to_date_time