gstreamer/gst/debug/negotiation.c

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/*
* GStreamer
* Copyright (C) 1999-2001 Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) 2002 David A. Schleef <ds@schleef.org>
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#define GST_TYPE_NEGOTIATION \
(gst_gst_negotiation_get_type())
#define GST_NEGOTIATION(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_NEGOTIATION,GstNegotiation))
#define GST_NEGOTIATION_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_NEGOTIATION,GstNegotiation))
#define GST_IS_NEGOTIATION(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_NEGOTIATION))
#define GST_IS_NEGOTIATION_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_NEGOTIATION))
typedef struct _GstNegotiation GstNegotiation;
typedef struct _GstNegotiationClass GstNegotiationClass;
struct _GstNegotiation
{
GstElement element;
GstPad *sinkpad, *srcpad;
GstCaps *caps;
};
struct _GstNegotiationClass
{
GstElementClass parent_class;
};
GType gst_gst_negotiation_get_type (void);
static GstElementDetails plugin_details = {
"Negotiation",
"Testing",
"This element acts like identity, except that one can control how "
"negotiation works",
"David A. Schleef <ds@schleef.org>",
};
/* Filter signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_ALLOWED_CAPS
};
static GstStaticPadTemplate gst_negotiation_sink_factory =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate gst_negotiation_src_factory =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static void gst_negotiation_base_init (gpointer g_class);
static void gst_negotiation_class_init (GstNegotiationClass * klass);
static void gst_negotiation_init (GstNegotiation * filter);
static GstCaps *gst_negotiation_getcaps (GstPad * pad);
static GstPadLinkReturn gst_negotiation_pad_link (GstPad * pad,
const GstCaps * caps);
static void gst_negotiation_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_negotiation_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_negotiation_update_caps (GstNegotiation * negotiation);
static void gst_negotiation_chain (GstPad * pad, GstData * _data);
static GstElementClass *parent_class = NULL;
typedef struct _GstFencedBuffer GstFencedBuffer;
struct _GstFencedBuffer
{
GstBuffer buffer;
void *region;
unsigned int length;
};
GType
gst_gst_negotiation_get_type (void)
{
static GType plugin_type = 0;
if (!plugin_type) {
static const GTypeInfo plugin_info = {
sizeof (GstNegotiationClass),
gst_negotiation_base_init,
NULL,
(GClassInitFunc) gst_negotiation_class_init,
NULL,
NULL,
sizeof (GstNegotiation),
0,
(GInstanceInitFunc) gst_negotiation_init,
};
plugin_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstNegotiation", &plugin_info, 0);
}
return plugin_type;
}
static void
gst_negotiation_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_negotiation_sink_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_negotiation_src_factory));
gst_element_class_set_details (element_class, &plugin_details);
}
static void
gst_negotiation_class_init (GstNegotiationClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
gobject_class->set_property = gst_negotiation_set_property;
gobject_class->get_property = gst_negotiation_get_property;
g_object_class_install_property (gobject_class, ARG_ALLOWED_CAPS,
g_param_spec_boxed ("allowed-caps", "Caps",
"The range of formats allowed by " "this element's peers",
GST_TYPE_CAPS, G_PARAM_READABLE));
}
static void
gst_negotiation_init (GstNegotiation * filter)
{
filter->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&gst_negotiation_sink_factory), "sink");
gst_pad_set_getcaps_function (filter->sinkpad, gst_negotiation_getcaps);
gst_pad_set_link_function (filter->sinkpad, gst_negotiation_pad_link);
filter->srcpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&gst_negotiation_src_factory), "src");
gst_pad_set_getcaps_function (filter->srcpad, gst_negotiation_getcaps);
gst_pad_set_link_function (filter->srcpad, gst_negotiation_pad_link);
gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
gst_pad_set_chain_function (filter->sinkpad, gst_negotiation_chain);
}
static GstCaps *
gst_negotiation_getcaps (GstPad * pad)
{
GstNegotiation *negotiation = GST_NEGOTIATION (gst_pad_get_parent (pad));
GstPad *otherpad;
GstCaps *caps;
otherpad = (pad == negotiation->sinkpad) ? negotiation->srcpad :
negotiation->sinkpad;
caps = gst_pad_get_allowed_caps (otherpad);
GST_ERROR ("getcaps called on %" GST_PTR_FORMAT ", returning %"
GST_PTR_FORMAT, pad, caps);
gst_negotiation_update_caps (negotiation);
return caps;
}
static GstPadLinkReturn
gst_negotiation_pad_link (GstPad * pad, const GstCaps * caps)
{
GstNegotiation *negotiation = GST_NEGOTIATION (gst_pad_get_parent (pad));
GstPad *otherpad;
GstPadLinkReturn ret;
otherpad = (pad == negotiation->sinkpad) ? negotiation->srcpad :
negotiation->sinkpad;
ret = gst_pad_try_set_caps (otherpad, caps);
GST_ERROR ("pad_link called on %" GST_PTR_FORMAT " with caps %"
GST_PTR_FORMAT ", returning %d", pad, caps, ret);
return ret;
}
static void
gst_negotiation_update_caps (GstNegotiation * negotiation)
{
GstCaps *srccaps;
GstCaps *sinkcaps;
GstCaps *icaps;
srccaps = gst_pad_get_allowed_caps (negotiation->srcpad);
sinkcaps = gst_pad_get_allowed_caps (negotiation->sinkpad);
icaps = gst_caps_intersect (srccaps, sinkcaps);
gst_caps_free (srccaps);
gst_caps_free (sinkcaps);
gst_caps_replace (&negotiation->caps, icaps);
g_object_notify (G_OBJECT (negotiation), "allowed-caps");
g_print ("notify %s", gst_caps_to_string (icaps));
}
static void
gst_negotiation_chain (GstPad * pad, GstData * _data)
{
GstNegotiation *negotiation = GST_NEGOTIATION (gst_pad_get_parent (pad));
gst_pad_push (negotiation->srcpad, _data);
}
static void
gst_negotiation_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstNegotiation *filter;
g_return_if_fail (GST_IS_NEGOTIATION (object));
filter = GST_NEGOTIATION (object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_negotiation_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstNegotiation *filter;
g_return_if_fail (GST_IS_NEGOTIATION (object));
filter = GST_NEGOTIATION (object);
switch (prop_id) {
case ARG_ALLOWED_CAPS:
g_value_set_boxed (value, filter->caps);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
gboolean
gst_negotiation_plugin_init (GstPlugin * plugin)
{
if (!gst_element_register (plugin, "negotiation", GST_RANK_NONE,
GST_TYPE_NEGOTIATION))
return FALSE;
return TRUE;
}