switchbin: Initial checkin

Add code from Stream Unlimited implementing a bin
which switches between different internal decoding/processing
chains based on input caps

gst/meson.build

@@ -9,7 +9,7 @@ foreach plugin : ['accurip', 'adpcmdec', 'adpcmenc', 'aiff', 'asfmux',
                   'midi', 'mpegdemux', 'mpegpsmux', 'mpegtsdemux', 'mpegtsmux',
                   'mxf', 'netsim', 'onvif', 'pcapparse', 'pnm', 'proxy',
                   'rawparse', 'removesilence', 'rist', 'rtmp2', 'rtp', 'sdp',
-                  'segmentclip', 'siren', 'smooth', 'speed', 'subenc',
+                  'segmentclip', 'siren', 'smooth', 'speed', 'subenc', 'switchbin',
                   'timecode', 'transcode', 'videofilters',
                   'videoframe_audiolevel', 'videoparsers', 'videosignal',
                   'vmnc', 'y4m', 'yadif']

gst/switchbin/gstswitchbin.h

@@ -0,0 +1,87 @@
+/* switchbin
+ * Copyright (C) 2016  Carlos Rafael Giani
+ *
+ * gstswitchbin.h: Header for GstSwitchBin object
+ *
+ * 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 GSTSWITCHBIN_H___
+#define GSTSWITCHBIN_H___
+
+#include <gst/gst.h>
+
+
+G_BEGIN_DECLS
+
+
+typedef struct _GstSwitchBin GstSwitchBin;
+typedef struct _GstSwitchBinClass GstSwitchBinClass;
+typedef struct _GstSwitchBinPath GstSwitchBinPath;
+
+
+#define GST_TYPE_SWITCH_BIN             (gst_switch_bin_get_type())
+#define GST_SWITCH_BIN(obj)             (G_TYPE_CHECK_INSTANCE_CAST((obj), GST_TYPE_SWITCH_BIN, GstSwitchBin))
+#define GST_SWITCH_BIN_CLASS(klass)     (G_TYPE_CHECK_CLASS_CAST((klass), GST_TYPE_SWITCH_BIN, GstSwitchBinClass))
+#define GST_SWITCH_BIN_CAST(obj)        ((GstSwitchBin *)(obj))
+#define GST_IS_SWITCH_BIN(obj)          (G_TYPE_CHECK_INSTANCE_TYPE((obj), GST_TYPE_SWITCH_BIN))
+#define GST_IS_SWITCH_BIN_CLASS(klass)  (G_TYPE_CHECK_CLASS_TYPE((klass), GST_TYPE_SWITCH_BIN))
+
+
+struct _GstSwitchBin
+{
+	GstBin parent;
+
+	GMutex path_mutex;
+
+	GstSwitchBinPath **paths;
+	GstSwitchBinPath *current_path;
+	guint num_paths;
+
+	GstElement *input_identity;
+	GstEvent *last_stream_start;
+	GstPad *sinkpad, *srcpad;
+	gulong blocking_probe_id, drop_probe_id;
+
+	GstCaps *last_caps;
+};
+
+
+struct _GstSwitchBinClass
+{
+	GstBinClass parent_class;
+};
+
+
+struct _GstSwitchBinPath
+{
+	GstObject parent;
+
+	GstElement *element;
+	GstCaps *caps;
+	GstSwitchBin *bin;
+};
+
+
+GType gst_switch_bin_get_type(void);
+GType gst_switch_bin_path_get_type(void);
+
+
+G_END_DECLS
+
+
+#endif

gst/switchbin/meson.build

@@ -0,0 +1,14 @@
+switchbin_sources = [
+  'gstswitchbin.c', 'plugin.c'
+]
+
+gstswitchbin = library('gstswitchbin',
+  switchbin_sources,
+  c_args : gst_plugins_bad_args,
+  include_directories : [configinc],
+  dependencies : [gst_dep],
+  install : true,
+  install_dir : plugins_install_dir,
+)
+pkgconfig.generate(gstswitchbin, install_dir : plugins_pkgconfig_install_dir)
+plugins += [gstswitchbin]

gst/switchbin/plugin.c

@@ -0,0 +1,43 @@
+/* switchbin
+ * Copyright (C) 2016  Carlos Rafael Giani
+ *
+ * gstswitchbin.c: Element for switching between paths based on input caps
+ *
+ * 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.
+ */
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "gstswitchbin.h"
+
+
+static gboolean
+plugin_init (GstPlugin * plugin)
+{
+  gboolean ret = TRUE;
+  ret = ret
+      && gst_element_register (plugin, "switchbin", GST_RANK_NONE,
+      gst_switch_bin_get_type ());
+  return ret;
+}
+
+
+GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
+    GST_VERSION_MINOR,
+    switchbin,
+    "switchbin",
+    plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)

meson_options.txt

@@ -57,6 +57,7 @@ option('siren', type : 'feature', value : 'auto')
 option('smooth', type : 'feature', value : 'auto')
 option('speed', type : 'feature', value : 'auto')
 option('subenc', type : 'feature', value : 'auto')
+option('switchbin', type : 'feature', value : 'auto')
 option('timecode', type : 'feature', value : 'auto')
 option('videofilters', type : 'feature', value : 'auto')
 option('videoframe_audiolevel', type : 'feature', value : 'auto')