gstreamer/plugins/elements/gsttee.c
Wim Taymans 90f82b6840 Added mthodes to request an element to create pads: gst_element_request_pad*
Original commit message from CVS:
Added mthodes to request an element to create pads: gst_element_request_pad*
This can be used to construct a tee and a muxer/mixer/aggregator element.
Moved the tee element to elements/ because it can now be handled with the
new pad request features.
The padfactory also has some changes: a pad can now be of presence REQUEST,
which means that the pad can be requested from this plugin (doh).
2001-01-18 23:46:15 +00:00

205 lines
4.8 KiB
C

/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wim.taymans@chello.be>
*
* gsttee.c: Tee element, one in N out
*
* 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 "gsttee.h"
GstElementDetails gst_tee_details = {
"Tee pipe fitting",
"Tee",
"1-to-N pipe fitting",
VERSION,
"Erik Walthinsen <omega@cse.ogi.edu>\n"
"Wim Taymans <wim.taymans@chello.be>",
"(C) 1999, 2000",
};
/* Tee signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_NUM_PADS,
/* FILL ME */
};
static GstPadFactory tee_src_factory = {
"src%d",
GST_PAD_FACTORY_SRC,
GST_PAD_FACTORY_REQUEST,
NULL, /* no caps */
NULL,
};
static void gst_tee_class_init (GstTeeClass *klass);
static void gst_tee_init (GstTee *tee);
static GstPad* gst_tee_request_new_pad (GstElement *element, GstPadTemplate *temp);
static void gst_tee_get_arg (GtkObject *object, GtkArg *arg, guint id);
static void gst_tee_chain (GstPad *pad, GstBuffer *buf);
static GstElementClass *parent_class = NULL;
//static guint gst_tee_signals[LAST_SIGNAL] = { 0 };
static GstPadTemplate *gst_tee_src_template;
GtkType
gst_tee_get_type(void) {
static GtkType tee_type = 0;
if (!tee_type) {
static const GtkTypeInfo tee_info = {
"GstTee",
sizeof(GstTee),
sizeof(GstTeeClass),
(GtkClassInitFunc)gst_tee_class_init,
(GtkObjectInitFunc)gst_tee_init,
(GtkArgSetFunc)NULL,
(GtkArgGetFunc)NULL,
(GtkClassInitFunc)NULL,
};
tee_type = gtk_type_unique (GST_TYPE_ELEMENT, &tee_info);
}
return tee_type;
}
static void
gst_tee_class_init (GstTeeClass *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 ("GstTee::num_pads", GTK_TYPE_INT,
GTK_ARG_READABLE, ARG_NUM_PADS);
gtkobject_class->get_arg = gst_tee_get_arg;
gstelement_class->request_new_pad = gst_tee_request_new_pad;
}
static void
gst_tee_init (GstTee *tee)
{
tee->sinkpad = gst_pad_new ("sink", GST_PAD_SINK);
gst_element_add_pad (GST_ELEMENT (tee), tee->sinkpad);
gst_pad_set_chain_function (tee->sinkpad, gst_tee_chain);
tee->numsrcpads = 0;
tee->srcpads = NULL;
}
static GstPad*
gst_tee_request_new_pad (GstElement *element, GstPadTemplate *templ)
{
gchar *name;
GstPad *srcpad;
GstTee *tee;
g_return_val_if_fail (GST_IS_TEE (element), NULL);
if (templ->direction != GST_PAD_SRC) {
g_warning ("gsttee: request new pad that is not a SRC pad\n");
return NULL;
}
tee = GST_TEE (element);
name = g_strdup_printf ("src%d",tee->numsrcpads);
srcpad = gst_pad_new_from_template (templ, name);
gst_element_add_pad (GST_ELEMENT (tee), srcpad);
tee->srcpads = g_slist_prepend (tee->srcpads, srcpad);
tee->numsrcpads++;
return srcpad;
}
static void
gst_tee_get_arg (GtkObject *object, GtkArg *arg, guint id)
{
GstTee *tee;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_TEE (object));
tee = GST_TEE (object);
switch(id) {
case ARG_NUM_PADS:
GTK_VALUE_INT (*arg) = tee->numsrcpads;
break;
default:
break;
}
}
/**
* gst_tee_chain:
* @pad: the pad to follow
* @buf: the buffer to pass
*
* Chain a buffer on a pad.
*/
static void
gst_tee_chain (GstPad *pad, GstBuffer *buf)
{
GstTee *tee;
GSList *srcpads;
int i;
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (buf != NULL);
tee = GST_TEE (pad->parent);
gst_trace_add_entry (NULL, 0, buf, "tee buffer");
for (i=0; i<tee->numsrcpads-1; i++)
gst_buffer_ref (buf);
srcpads = tee->srcpads;
while (srcpads) {
gst_pad_push (GST_PAD (srcpads->data), buf);
srcpads = g_slist_next (srcpads);
}
}
gboolean
gst_tee_factory_init (GstElementFactory *factory)
{
gst_tee_src_template = gst_padtemplate_new (&tee_src_factory);
gst_elementfactory_add_padtemplate (factory, gst_tee_src_template);
return TRUE;
}