gstreamer/gst/gsttypefind.c

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gsttypefind.c:
*
* 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 "gst_private.h"
#include "gsttype.h"
#include "gsttypefind.h"
//#define GST_DEBUG_ENABLED
GstElementDetails gst_typefind_details = {
"TypeFind",
"TypeFind",
"Finds the media type",
VERSION,
"Erik Walthinsen <omega@cse.ogi.edu>"
"Wim Taymans <wim.taymans@chello.be>",
"(C) 1999",
};
/* TypeFind signals and args */
enum {
HAVE_TYPE,
LAST_SIGNAL
};
enum {
ARG_0,
ARG_CAPS,
};
static void gst_typefind_class_init (GstTypeFindClass *klass);
static void gst_typefind_init (GstTypeFind *typefind);
static void gst_typefind_set_arg (GtkObject *object, GtkArg *arg, guint id);
static void gst_typefind_get_arg (GtkObject *object, GtkArg *arg, guint id);
static void gst_typefind_chain (GstPad *pad, GstBuffer *buf);
static GstElementClass *parent_class = NULL;
static guint gst_typefind_signals[LAST_SIGNAL] = { 0 };
GtkType
gst_typefind_get_type(void) {
static GtkType typefind_type = 0;
if (!typefind_type) {
static const GtkTypeInfo typefind_info = {
"GstTypeFind",
sizeof(GstTypeFind),
sizeof(GstTypeFindClass),
(GtkClassInitFunc)gst_typefind_class_init,
(GtkObjectInitFunc)gst_typefind_init,
(GtkArgSetFunc)gst_typefind_set_arg,
(GtkArgGetFunc)gst_typefind_get_arg,
(GtkClassInitFunc)NULL,
};
typefind_type = gtk_type_unique(GST_TYPE_ELEMENT,&typefind_info);
}
return typefind_type;
}
static void
gst_typefind_class_init (GstTypeFindClass *klass)
{
GtkObjectClass *gtkobject_class;
gtkobject_class = (GtkObjectClass*)klass;
parent_class = gtk_type_class (GST_TYPE_ELEMENT);
gtk_object_add_arg_type("GstTypeFind::caps", GTK_TYPE_POINTER,
GTK_ARG_READABLE, ARG_CAPS);
gst_typefind_signals[HAVE_TYPE] =
gtk_signal_new ("have_type", GTK_RUN_LAST, gtkobject_class->type,
GTK_SIGNAL_OFFSET (GstTypeFindClass, have_type),
gtk_marshal_NONE__INT, GTK_TYPE_NONE, 1, GTK_TYPE_POINTER);
gtk_object_class_add_signals (gtkobject_class, gst_typefind_signals,
LAST_SIGNAL);
gtkobject_class->set_arg = gst_typefind_set_arg;
gtkobject_class->get_arg = gst_typefind_get_arg;
}
static void
gst_typefind_init (GstTypeFind *typefind)
{
typefind->sinkpad = gst_pad_new ("sink", GST_PAD_SINK);
gst_element_add_pad (GST_ELEMENT (typefind), typefind->sinkpad);
gst_pad_set_chain_function (typefind->sinkpad, gst_typefind_chain);
}
static void
gst_typefind_set_arg (GtkObject *object, GtkArg *arg, guint id)
{
GstTypeFind *typefind;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_TYPEFIND (object));
typefind = GST_TYPEFIND (object);
switch(id) {
default:
break;
}
}
static void
gst_typefind_get_arg (GtkObject *object, GtkArg *arg, guint id)
{
GstTypeFind *typefind;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_TYPEFIND (object));
typefind = GST_TYPEFIND (object);
switch(id) {
case ARG_CAPS:
GTK_VALUE_POINTER (*arg) = typefind->caps;
break;
default:
break;
}
}
static void
gst_typefind_chain (GstPad *pad, GstBuffer *buf)
{
GstTypeFind *typefind;
GList *type_list;
GstType *type;
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (buf != NULL);
typefind = GST_TYPEFIND (GST_OBJECT_PARENT (pad));
GST_DEBUG (0,"got buffer of %d bytes in '%s'\n",
GST_BUFFER_SIZE (buf), GST_OBJECT_NAME (typefind));
type_list = gst_type_get_list ();
while (type_list) {
GSList *funcs;
type = (GstType *)type_list->data;
funcs = type->typefindfuncs;
while (funcs) {
GstTypeFindFunc typefindfunc = (GstTypeFindFunc)funcs->data;
GstCaps *caps;
GST_DEBUG (0,"try type :%d \"%s\"\n", type->id, type->mime);
if (typefindfunc && (caps = typefindfunc (buf, type))) {
GST_DEBUG (0,"found type :%d \"%s\"\n", caps->id, type->mime);
typefind->caps = caps;
gtk_signal_emit (GTK_OBJECT (typefind), gst_typefind_signals[HAVE_TYPE],
typefind->caps);
goto end;
}
funcs = g_slist_next (funcs);
}
type_list = g_list_next (type_list);
}
end:
gst_buffer_unref (buf);
}