subtitleoverlay: Add new element for generic subtitle overlaying

This autopluggs the required elements for parsing and rendering
different subtitle formats on a video stream.

Fixes bug #600370.

gst/playback/Makefile.am

@@ -21,7 +21,8 @@ libgstplaybin_la_SOURCES = \
 	gstinputselector.c \
 	gstscreenshot.c \
 	gststreaminfo.c \
-	gststreamselector.c
+	gststreamselector.c \
+	gstsubtitleoverlay.c
 
 nodist_libgstplaybin_la_SOURCES = $(built_sources)
 libgstplaybin_la_CFLAGS = $(GST_PLUGINS_BASE_CFLAGS) $(GST_CFLAGS)
@@ -29,6 +30,7 @@ libgstplaybin_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
 libgstplaybin_la_LIBADD = \
 	$(top_builddir)/gst-libs/gst/pbutils/libgstpbutils-@GST_MAJORMINOR@.la \
 	$(top_builddir)/gst-libs/gst/interfaces/libgstinterfaces-@GST_MAJORMINOR@.la \
+	$(top_builddir)/gst-libs/gst/video/libgstvideo-@GST_MAJORMINOR@.la \
 	$(GST_LIBS)
 libgstplaybin_la_LIBTOOLFLAGS = --tag=disable-static
 
@@ -59,7 +61,8 @@ noinst_HEADERS = \
 	gstplay-enum.h \
 	gstscreenshot.h \
 	gststreamselector.h \
-	gstrawcaps.h
+	gstrawcaps.h \
+	gstsubtitleoverlay.h
 
 noinst_PROGRAMS = test decodetest test2 test3 test4 test5 test6 test7
 

gst/playback/gstplayback.c

@@ -30,6 +30,7 @@
 #include "gststreamselector.h"
 #include "gststreaminfo.h"
 #include "gstplaysink.h"
+#include "gstsubtitleoverlay.h"
 
 gboolean gst_play_bin_plugin_init (GstPlugin * plugin);
 gboolean gst_play_bin2_plugin_init (GstPlugin * plugin);
@@ -56,6 +57,7 @@ plugin_init (GstPlugin * plugin)
   res = gst_play_bin_plugin_init (plugin);
   res &= gst_play_bin2_plugin_init (plugin);
   res &= gst_play_sink_plugin_init (plugin);
+  res &= gst_subtitle_overlay_plugin_init (plugin);
 
   return res;
 }

gst/playback/gstsubtitleoverlay.h

@@ -0,0 +1,116 @@
+/* GStreamer
+ * Copyright (C) 2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
+ *
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __GST_SUBTITLE_OVERLAY_H__
+#define __GST_SUBTITLE_OVERLAY_H__
+
+#include <gst/gst.h>
+
+G_BEGIN_DECLS
+#define GST_TYPE_SUBTITLE_OVERLAY \
+  (gst_subtitle_overlay_get_type())
+#define GST_SUBTITLE_OVERLAY(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_SUBTITLE_OVERLAY, GstSubtitleOverlay))
+#define GST_SUBTITLE_OVERLAY_CAST(obj) \
+  ((GstSubtitleOverlay *) obj)
+#define GST_SUBTITLE_OVERLAY_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_SUBTITLE_OVERLAY, GstSubtitleOverlayClass))
+#define GST_IS_SUBTITLE_OVERLAY(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_SUBTITLE_OVERLAY))
+#define GST_IS_SUBTITLE_OVERLAY_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_SUBTITLE_OVERLAY))
+
+#define GST_SUBTITLE_OVERLAY_LOCK(obj) G_STMT_START {                   \
+    GST_LOG_OBJECT (obj,                                                \
+                    "locking from thread %p",                           \
+                    g_thread_self ());                                  \
+    g_mutex_lock (GST_SUBTITLE_OVERLAY_CAST(obj)->lock);                \
+    GST_LOG_OBJECT (obj,                                                \
+                    "locked from thread %p",                            \
+                    g_thread_self ());                                  \
+} G_STMT_END
+
+#define GST_SUBTITLE_OVERLAY_UNLOCK(obj) G_STMT_START {                 \
+    GST_LOG_OBJECT (obj,                                                \
+                    "unlocking from thread %p",                         \
+                    g_thread_self ());                                  \
+    g_mutex_unlock (GST_SUBTITLE_OVERLAY_CAST(obj)->lock);              \
+} G_STMT_END
+
+typedef struct _GstSubtitleOverlay GstSubtitleOverlay;
+typedef struct _GstSubtitleOverlayClass GstSubtitleOverlayClass;
+
+struct _GstSubtitleOverlay
+{
+  GstBin parent;
+
+  gchar *font_desc;
+
+  gboolean do_async;
+
+  GstPad *srcpad;
+  GstPadEventFunction src_proxy_event;
+
+  GstPad *video_sinkpad;
+  GstPad *video_block_pad;
+  GstPadEventFunction video_sink_event;
+  gboolean video_sink_blocked;
+  GstSegment video_segment;
+  gboolean video_segment_pending;
+
+  GstPad *subtitle_sinkpad;
+  GstPad *subtitle_block_pad;
+  GstPadLinkFunction subtitle_sink_link;
+  GstPadUnlinkFunction subtitle_sink_unlink;
+  GstPadEventFunction subtitle_sink_event;
+  GstPadSetCapsFunction subtitle_sink_setcaps;
+  gboolean subtitle_sink_blocked;
+  GstSegment subtitle_segment;
+  gboolean subtitle_segment_pending;
+  gboolean subtitle_flush;
+
+  GList *factories;
+  GstCaps *factory_caps;
+
+  GMutex *lock;
+  GstCaps *subcaps;
+
+  GstElement *passthrough_identity;
+
+  GstElement *pre_colorspace;
+  GstElement *post_colorspace;
+
+  GstElement *parser;
+  GstElement *overlay;
+
+  GstElement *renderer;
+};
+
+struct _GstSubtitleOverlayClass
+{
+  GstBinClass parent;
+};
+
+GType gst_subtitle_overlay_get_type (void);
+gboolean gst_subtitle_overlay_plugin_init (GstPlugin * plugin);
+
+GstCaps *gst_subtitle_overlay_create_factory_caps (void);
+
+G_END_DECLS
+#endif /* __GST_SUBTITLE_OVERLAY_H__ */