gstreamer/gst/elements/gstfakesrc.c
Wim Taymans 74598fdf6c Added handoff signals to fakesrc and fakesink
Original commit message from CVS:
Added handoff signals to fakesrc and fakesink
Added scheduling property to identity
Added GST_STATE_TRANSITION macro to check for state changes.
Modified gstbin and gstthread to the new state change macros
2000-12-23 03:17:52 +00:00

194 lines
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 <gstfakesrc.h>
GstElementDetails gst_fakesrc_details = {
"Fake Source",
"Source",
"Push empty (no data) buffers around",
VERSION,
"Erik Walthinsen <omega@cse.ogi.edu>",
"(C) 1999",
};
/* FakeSrc signals and args */
enum {
/* FILL ME */
SIGNAL_HANDOFF,
LAST_SIGNAL
};
enum {
ARG_0,
ARG_NUM_SOURCES,
};
static void gst_fakesrc_class_init (GstFakeSrcClass *klass);
static void gst_fakesrc_init (GstFakeSrc *fakesrc);
static void gst_fakesrc_set_arg (GtkObject *object, GtkArg *arg, guint id);
static void gst_fakesrc_get_arg (GtkObject *object, GtkArg *arg, guint id);
static GstBuffer * gst_fakesrc_get (GstPad *pad);
static GstSrcClass *parent_class = NULL;
static guint gst_fakesrc_signals[LAST_SIGNAL] = { 0 };
GtkType
gst_fakesrc_get_type (void)
{
static GtkType fakesrc_type = 0;
if (!fakesrc_type) {
static const GtkTypeInfo fakesrc_info = {
"GstFakeSrc",
sizeof(GstFakeSrc),
sizeof(GstFakeSrcClass),
(GtkClassInitFunc)gst_fakesrc_class_init,
(GtkObjectInitFunc)gst_fakesrc_init,
(GtkArgSetFunc)NULL,
(GtkArgGetFunc)NULL,
(GtkClassInitFunc)NULL,
};
fakesrc_type = gtk_type_unique (GST_TYPE_SRC, &fakesrc_info);
}
return fakesrc_type;
}
static void
gst_fakesrc_class_init (GstFakeSrcClass *klass)
{
GtkObjectClass *gtkobject_class;
GstSrcClass *gstsrc_class;
gtkobject_class = (GtkObjectClass*)klass;
gstsrc_class = (GstSrcClass*)klass;
parent_class = gtk_type_class (GST_TYPE_SRC);
gtk_object_add_arg_type ("GstFakeSrc::num_sources", GTK_TYPE_INT,
GTK_ARG_READWRITE, ARG_NUM_SOURCES);
gtkobject_class->set_arg = gst_fakesrc_set_arg;
gtkobject_class->get_arg = gst_fakesrc_get_arg;
gst_fakesrc_signals[SIGNAL_HANDOFF] =
gtk_signal_new ("handoff", GTK_RUN_LAST, gtkobject_class->type,
GTK_SIGNAL_OFFSET (GstFakeSrcClass, handoff),
gtk_marshal_NONE__NONE, GTK_TYPE_NONE, 0);
gtk_object_class_add_signals (gtkobject_class, gst_fakesrc_signals,
LAST_SIGNAL);
}
static void gst_fakesrc_init(GstFakeSrc *fakesrc) {
GstPad *pad;
// set the default number of
fakesrc->numsrcpads = 1;
// create our first output pad
pad = gst_pad_new("src",GST_PAD_SRC);
gst_pad_set_get_function(pad,gst_fakesrc_get);
gst_element_add_pad(GST_ELEMENT(fakesrc),pad);
fakesrc->srcpads = g_slist_append(NULL,pad);
// we're ready right away, since we don't have any args...
// gst_element_set_state(GST_ELEMENT(fakesrc),GST_STATE_READY);
}
static void
gst_fakesrc_set_arg (GtkObject *object, GtkArg *arg, guint id)
{
GstFakeSrc *src;
gint new_numsrcs;
GstPad *pad;
/* it's not null if we got it, but it might not be ours */
src = GST_FAKESRC (object);
switch(id) {
case ARG_NUM_SOURCES:
new_numsrcs = GTK_VALUE_INT (*arg);
if (new_numsrcs > src->numsrcpads) {
while (src->numsrcpads != new_numsrcs) {
pad = gst_pad_new(g_strdup_printf("src%d",src->numsrcpads),GST_PAD_SRC);
gst_pad_set_get_function(pad,gst_fakesrc_get);
gst_element_add_pad(GST_ELEMENT(src),pad);
src->srcpads = g_slist_append(src->srcpads,pad);
src->numsrcpads++;
}
}
break;
default:
break;
}
}
static void
gst_fakesrc_get_arg (GtkObject *object, GtkArg *arg, guint id)
{
GstFakeSrc *src;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_FAKESRC (object));
src = GST_FAKESRC (object);
switch (id) {
case ARG_NUM_SOURCES:
GTK_VALUE_INT (*arg) = src->numsrcpads;
break;
default:
arg->type = GTK_TYPE_INVALID;
break;
}
}
/**
* gst_fakesrc_get:
* @src: the faksesrc to get
*
* generate an empty buffer and push it to the next element.
*/
static GstBuffer *
gst_fakesrc_get(GstPad *pad)
{
GstFakeSrc *src;
GstBuffer *buf;
g_return_val_if_fail(pad != NULL, NULL);
src = GST_FAKESRC(gst_pad_get_parent(pad));
g_return_val_if_fail(GST_IS_FAKESRC(src), NULL);
g_print("(%s:%s)> ",GST_DEBUG_PAD_NAME(pad));
buf = gst_buffer_new();
gtk_signal_emit (GTK_OBJECT (src), gst_fakesrc_signals[SIGNAL_HANDOFF],
src);
return buf;
}