identity-light: add simple identity element

gst/identity-light/gstidentity-light.c

+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "gstidentity-light.h"
+
+GST_DEBUG_CATEGORY_STATIC (gst_identity_light_debug);
+#define GST_CAT_DEFAULT gst_identity_light_debug
+
+#define _do_init \
+    GST_DEBUG_CATEGORY_INIT (gst_identity_light_debug, "identity-light", 0, "identity element");
+
+#define gst_identity_light_parent_class parent_class
+G_DEFINE_TYPE_WITH_CODE (GstIdentityLight, gst_identity_light, GST_TYPE_ELEMENT,
+    _do_init);
+
+static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
+    GST_PAD_SINK,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS_ANY);
+
+static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS_ANY);
+
+static void
+gst_identity_light_class_init (GstIdentityLightClass * klass)
+{
+  GstElementClass *gstelement_class;
+
+  gstelement_class = GST_ELEMENT_CLASS (klass);
+
+  gst_element_class_set_static_metadata (gstelement_class,
+      "Identity",
+      "Generic",
+      "Does nothing with the data",
+      "Guillaume Desmottes <guillaume.desmottes@collabora.com>");
+  gst_element_class_add_static_pad_template (gstelement_class, &srctemplate);
+  gst_element_class_add_static_pad_template (gstelement_class, &sinktemplate);
+}
+
+static GstFlowReturn
+identity_sink_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
+{
+  GstIdentityLight *self = GST_IDENTITY_LIGHT (parent);
+  GST_LOG_OBJECT (pad, "Handling buffer %" GST_PTR_FORMAT, buffer);
+  return gst_pad_push (self->srcpad, buffer);
+}
+
+static gboolean
+identity_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
+{
+  GstIdentityLight *self = GST_IDENTITY_LIGHT (parent);
+  GST_LOG_OBJECT (pad, "Handling event %" GST_PTR_FORMAT, event);
+  return gst_pad_push_event (self->srcpad, event);
+}
+
+static gboolean
+identity_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
+{
+  GstIdentityLight *self = GST_IDENTITY_LIGHT (parent);
+  GST_LOG_OBJECT (pad, "Handling query %" GST_PTR_FORMAT, query);
+  return gst_pad_peer_query (self->srcpad, query);
+}
+
+static gboolean
+identity_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
+{
+  GstIdentityLight *self = GST_IDENTITY_LIGHT (parent);
+  GST_LOG_OBJECT (pad, "Handling event %" GST_PTR_FORMAT, event);
+  return gst_pad_push_event (self->sinkpad, event);
+}
+
+static gboolean
+identity_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
+{
+  GstIdentityLight *self = GST_IDENTITY_LIGHT (parent);
+  GST_LOG_OBJECT (pad, "Handling query %" GST_PTR_FORMAT, query);
+  return gst_pad_peer_query (self->sinkpad, query);
+}
+
+static void
+gst_identity_light_init (GstIdentityLight * self)
+{
+  self->srcpad = gst_pad_new_from_static_template (&srctemplate, "src");
+  self->sinkpad = gst_pad_new_from_static_template (&sinktemplate, "sink");
+
+  gst_pad_set_chain_function (self->sinkpad, identity_sink_chain);
+  gst_pad_set_event_function (self->sinkpad, identity_sink_event);
+  gst_pad_set_query_function (self->sinkpad, identity_sink_query);
+
+  gst_pad_set_event_function (self->srcpad, identity_src_event);
+  gst_pad_set_query_function (self->srcpad, identity_src_query);
+
+  gst_element_add_pad (GST_ELEMENT_CAST (self), self->srcpad);
+  gst_element_add_pad (GST_ELEMENT_CAST (self), self->sinkpad);
+}
+
+static gboolean
+plugin_init (GstPlugin * plugin)
+{
+  return gst_element_register (plugin, "identity_light", GST_RANK_NONE,
+      GST_TYPE_IDENTITY_LIGHT);
+}
+
+GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
+    GST_VERSION_MINOR,
+    identitylight,
+    "light identity",
+    plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)

gst/identity-light/gstidentity-light.h

+#ifndef __GST_IDENTITY_H__
+#define __GST_IDENTITY_H__
+
+#include <gst/gst.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_IDENTITY_LIGHT (gst_identity_light_get_type ())
+
+G_DECLARE_FINAL_TYPE (GstIdentityLight, gst_identity_light, GST, IDENTITY_LIGHT, GstElement)
+
+struct _GstIdentityLight
+{
+  GstElement parent;
+
+  GstPad *srcpad;
+  GstPad *sinkpad;
+};
+
+G_END_DECLS
+
+#endif

gst/identity-light/meson.build

+gstidentity_light = library('gstidentitylight',
+  'gstidentity-light.c',
+  c_args : gst_plugins_good_args,
+  include_directories : [configinc, libsinc],
+  dependencies : [gst_dep],
+  install : true,
+  install_dir : plugins_install_dir,
+)
+pkgconfig.generate(gstidentity_light, install_dir : plugins_pkgconfig_install_dir)
+plugins += [gstidentity_light]

gst/meson.build

@@ -11,3 +11,4 @@ foreach plugin : ['alpha', 'apetag', 'audiofx', 'audioparsers', 'auparse',
     subdir(plugin)
   endif
 endforeach
+subdir('identity-light')