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_property (GObject *object, guint prop_id,
const GValue *value, GParamSpec *pspec);
static void gst_typefind_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec);
static void gst_typefind_chain (GstPad *pad, GstBuffer *buf);
static GstElementClass *parent_class = NULL;
static guint gst_typefind_signals[LAST_SIGNAL] = { 0 };
GType
gst_typefind_get_type (void)
{
static GType typefind_type = 0;
if (!typefind_type) {
static const GTypeInfo typefind_info = {
sizeof(GstTypeFindClass),
NULL,
NULL,
(GClassInitFunc)gst_typefind_class_init,
NULL,
NULL,
sizeof(GstTypeFind),
0,
(GInstanceInitFunc)gst_typefind_init,
NULL
};
typefind_type = g_type_register_static (GST_TYPE_ELEMENT, "GstTypeFind", &typefind_info, 0);
}
return typefind_type;
}
static void
gst_typefind_class_init (GstTypeFindClass *klass)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass*)klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_CAPS,
g_param_spec_pointer("caps", "Caps", "Found capabilities", G_PARAM_READABLE));
gst_typefind_signals[HAVE_TYPE] =
g_signal_new ("have_type", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstTypeFindClass, have_type), NULL, NULL,
g_cclosure_marshal_VOID__POINTER, G_TYPE_NONE, 1,
G_TYPE_POINTER);
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_typefind_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_typefind_get_property);
}
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_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
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 (prop_id) {
default:
break;
}
}
static void
gst_typefind_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
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 (prop_id) {
case ARG_CAPS:
g_value_set_pointer(value, 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 *factories;
type = (GstType *)type_list->data;
factories = type->factories;
while (factories) {
GstTypeFactory *factory = GST_TYPEFACTORY (factories->data);
GstTypeFindFunc typefindfunc = (GstTypeFindFunc)factory->typefindfunc;
GstCaps *caps;
GST_DEBUG (0,"try type :%d \"%s\"\n", type->id, type->mime);
if (typefindfunc && (caps = typefindfunc (buf, factory))) {
GST_DEBUG (0,"found type :%d \"%s\" \"%s\"\n", caps->id, type->mime,
gst_caps_get_name (caps));
typefind->caps = caps;
if (!gst_pad_try_set_caps (pad, caps)) {
g_warning ("typefind: found type but peer didn't accept it");
}
{
int oldstate = GST_STATE(typefind);
gst_object_ref (GST_OBJECT (typefind));
g_signal_emit (G_OBJECT (typefind), gst_typefind_signals[HAVE_TYPE], 0,
typefind->caps);
if (GST_STATE(typefind) != oldstate) {
GST_DEBUG(0, "state changed during signal, aborting\n");
gst_element_interrupt (GST_ELEMENT (typefind));
}
gst_object_unref (GST_OBJECT (typefind));
goto end;
}
}
factories = g_slist_next (factories);
}
type_list = g_list_next (type_list);
}
end:
gst_buffer_unref (buf);
}