closedcaption: Add ccconverter element that can convert between different types of Closed Caption formats

ext/closedcaption/Makefile.am

@@ -20,15 +20,11 @@ libgstclosedcaption_la_SOURCES = \
 	$(zvbi_sources) \
 	$(zvbi_headers) \
 	gstcccombiner.c \
-	gstcccombiner.h \
 	gstccextractor.c \
-	gstccextractor.h \
+	gstccconverter.c \
 	gstcea708decoder.c \
-	gstcea708decoder.h \
 	gstceaccoverlay.c \
-	gstceaccoverlay.h \
 	gstline21dec.c \
-	gstline21dec.h \
 	gstclosedcaption.c
 
 libgstclosedcaption_la_CFLAGS = \
@@ -48,5 +44,8 @@ libgstclosedcaption_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
 noinst_HEADERS = \
 	gstccextractor.h \
 	gstcccombiner.h \
+	gstccconverter.h \
+	gstcea708decoder.h \
+	gstceaccoverlay.h \
 	gstline21dec.h \
 	$(zvbi_headers)

ext/closedcaption/gstccconverter.h

@@ -0,0 +1,64 @@
+/*
+ * GStreamer
+ * Copyright (C) 2018 Sebastian Dröge <sebastian@centricular.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __GST_CCCONVERTER_H__
+#define __GST_CCCONVERTER_H__
+
+#include <gst/gst.h>
+#include <gst/base/base.h>
+#include <gst/video/video.h>
+
+G_BEGIN_DECLS
+#define GST_TYPE_CCCONVERTER \
+  (gst_cc_converter_get_type())
+#define GST_CCCONVERTER(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_CCCONVERTER,GstCCConverter))
+#define GST_CCCONVERTER_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_CCCONVERTER,GstCCConverterClass))
+#define GST_IS_CCCONVERTER(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_CCCONVERTER))
+#define GST_IS_CCCONVERTER_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_CCCONVERTER))
+
+typedef struct _GstCCConverter GstCCConverter;
+typedef struct _GstCCConverterClass GstCCConverterClass;
+
+struct _GstCCConverter
+{
+  GstBaseTransform parent;
+
+  GstVideoCaptionType input_caption_type;
+  GstVideoCaptionType output_caption_type;
+
+  /* CDP sequence numbers when outputting CDP */
+  guint16 cdp_hdr_sequence_cntr;
+
+  gint fps_n, fps_d;
+};
+
+struct _GstCCConverterClass
+{
+  GstBaseTransformClass parent_class;
+};
+
+GType gst_cc_converter_get_type (void);
+
+G_END_DECLS
+#endif /* __GST_CCCONVERTER_H__ */

ext/closedcaption/gstclosedcaption.c

@@ -26,6 +26,7 @@
 #include <gst/gst.h>
 
 #include "gstcccombiner.h"
+#include "gstccconverter.h"
 #include "gstccextractor.h"
 #include "gstline21dec.h"
 #include "gstceaccoverlay.h"
@@ -38,6 +39,9 @@ closedcaption_init (GstPlugin * plugin)
   ret = gst_element_register (plugin, "cccombiner", GST_RANK_NONE,
       GST_TYPE_CCCOMBINER);
 
+  ret &= gst_element_register (plugin, "ccconverter", GST_RANK_NONE,
+      GST_TYPE_CCCONVERTER);
+
   ret &= gst_element_register (plugin, "ccextractor", GST_RANK_NONE,
       GST_TYPE_CCEXTRACTOR);
 

ext/closedcaption/meson.build

@@ -10,8 +10,8 @@ zvbi_sources = [
 
 if pangocairo_dep.found()
   gstclosedcaption = library('gstclosedcaption',
-    'gstcccombiner.c', 'gstccextractor.c', 'gstclosedcaption.c', 'gstline21dec.c',
+    'gstcccombiner.c', 'gstccextractor.c', 'gstccconverter.c', 'gstclosedcaption.c',
-    'gstcea708decoder.c', 'gstceaccoverlay.c', zvbi_sources,
+    'gstline21dec.c', 'gstcea708decoder.c', 'gstceaccoverlay.c', zvbi_sources,
     c_args : gst_plugins_bad_args,
     link_args : noseh_link_args,
     include_directories : [configinc],