gstreamer/examples/plugins/example.c
Richard Boulton c12e795dec Move plugin example code to new location, and put it into build system.
Original commit message from CVS:
Move plugin example code to new location, and put it into build system.
Add work on firstplugin chapter of pwg.
Fix typo in quotes.
Add @'s before commands in manuals.mak
2001-01-08 23:55:27 +00:00

216 lines
5.5 KiB
C

/* Gnome-Streamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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.
*/
#include "example.h"
/* elementfactory information */
static GstElementDetails example_details = {
"An example plugin",
"Example",
"Shows the basic structure of a plugin",
VERSION,
"your name <your.name@your.isp>",
"(C) 2000",
};
/* Example signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_ACTIVE
};
static GstPadFactory sink_factory = {
"sink", /* the name of the pads */
GST_PAD_FACTORY_SINK, /* type of the pad */
GST_PAD_FACTORY_ALWAYS, /* ALWAYS/SOMETIMES */
GST_PAD_FACTORY_CAPS(
"example_sink", /* the name of the caps */
"unknown/unknown", /* the mime type of the caps */
"something", GST_PROPS_INT (1), /* a property */
"foo", GST_PROPS_BOOLEAN (TRUE) /* another property */
),
NULL
};
static GstPadFactory src_factory = {
"src",
GST_PAD_FACTORY_SRC,
GST_PAD_FACTORY_ALWAYS,
GST_PAD_FACTORY_CAPS(
"example_src",
"unknown/unknown"
),
NULL
};
static void gst_example_class_init (GstExampleClass *klass);
static void gst_example_init (GstExample *example);
static void gst_example_chain (GstPad *pad, GstBuffer *buf);
static void gst_example_set_arg (GtkObject *object,GtkArg *arg,guint id);
static void gst_example_get_arg (GtkObject *object,GtkArg *arg,guint id);
GstPadTemplate *src_template, *sink_template;
static GstElementClass *parent_class = NULL;
static guint gst_example_signals[LAST_SIGNAL] = { 0 };
GtkType
gst_example_get_type(void)
{
static GtkType example_type = 0;
if (!example_type) {
static const GtkTypeInfo example_info = {
"GstExample",
sizeof(GstExample),
sizeof(GstExampleClass),
(GtkClassInitFunc)gst_example_class_init,
(GtkObjectInitFunc)gst_example_init,
(GtkArgSetFunc)gst_example_set_arg,
(GtkArgGetFunc)gst_example_get_arg,
(GtkClassInitFunc)NULL,
};
example_type = gtk_type_unique(GST_TYPE_ELEMENT,&example_info);
}
return example_type;
}
static void
gst_example_class_init (GstExampleClass *klass)
{
GtkObjectClass *gtkobject_class;
GstElementClass *gstelement_class;
gtkobject_class = (GtkObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = gtk_type_class(GST_TYPE_ELEMENT);
gtk_object_add_arg_type("GstExample::active", GTK_TYPE_INT,
GTK_ARG_READWRITE, ARG_ACTIVE);
gtkobject_class->set_arg = gst_example_set_arg;
gtkobject_class->get_arg = gst_example_get_arg;
}
static void
gst_example_init(GstExample *example)
{
example->sinkpad = gst_pad_new_from_template (sink_template, "sink");
gst_element_add_pad(GST_ELEMENT(example),example->sinkpad);
gst_pad_set_chain_function(example->sinkpad,gst_example_chain);
example->srcpad = gst_pad_new_from_template (src_template, "src");
gst_element_add_pad(GST_ELEMENT(example),example->srcpad);
example->active = FALSE;
}
static void
gst_example_chain (GstPad *pad, GstBuffer *buf)
{
GstExample *example;
guchar *data;
gint i;
g_return_if_fail(pad != NULL);
g_return_if_fail(GST_IS_PAD(pad));
g_return_if_fail(buf != NULL);
//g_return_if_fail(GST_IS_BUFFER(buf));
example = GST_EXAMPLE(pad->parent);
g_return_if_fail(example != NULL);
g_return_if_fail(GST_IS_EXAMPLE(example));
if (example->active) {
/* DO STUFF */
}
gst_pad_push(example->srcpad,buf);
}
static void
gst_example_set_arg (GtkObject *object,GtkArg *arg,guint id)
{
GstExample *example;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail(GST_IS_EXAMPLE(object));
example = GST_EXAMPLE(object);
switch(id) {
case ARG_ACTIVE:
example->active = GTK_VALUE_INT(*arg);
g_print("example: set active to %d\n",example->active);
break;
default:
break;
}
}
static void
gst_example_get_arg (GtkObject *object,GtkArg *arg,guint id)
{
GstExample *example;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail(GST_IS_EXAMPLE(object));
example = GST_EXAMPLE(object);
switch (id) {
case ARG_ACTIVE:
GTK_VALUE_INT(*arg) = example->active;
break;
default:
arg->type = GTK_TYPE_INVALID;
break;
}
}
GstPlugin*
plugin_init (GModule *module)
{
GstPlugin *plugin;
GstElementFactory *factory;
plugin = gst_plugin_new("example");
g_return_if_fail(plugin != NULL);
factory = gst_elementfactory_new("example", GST_TYPE_EXAMPLE, &example_details);
g_return_if_fail(factory != NULL);
sink_template = gst_padtemplate_new (&sink_factory);
gst_elementfactory_add_padtemplate (factory, sink_template);
src_template = gst_padtemplate_new (&src_factory);
gst_elementfactory_add_padtemplate (factory, src_template);
gst_plugin_add_factory (plugin, factory);
return plugin;
}