gstreamer/gst/valve/gstvalve.c

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/* GStreamer
* Copyright 2007-2009 Collabora Ltd
* @author: Olivier Crete <olivier.crete@collabora.co.uk>
* Copyright 2007-2009 Nokia Corporation
*
* 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.
*
*/
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/**
* SECTION:element-valve
*
* The valve is a simple element that drops buffers when the #GstValve::drop
* property is set to %TRUE and lets then through otherwise.
*
* Any downstream error received while the #GstValve::drop property is %FALSE
* is ignored. So downstream element can be set to %GST_STATE_NULL and removed,
* without using pad blocking.
*
* Last reviewed on 2008-02-10 (0.10.11)
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstvalve.h"
#include <string.h>
GST_DEBUG_CATEGORY (valve_debug);
#define GST_CAT_DEFAULT (valve_debug)
static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
/* Valve signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_DROP,
};
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static void gst_valve_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
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static void gst_valve_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
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static gboolean gst_valve_event (GstPad * pad, GstEvent * event);
static GstFlowReturn gst_valve_buffer_alloc (GstPad * pad, guint64 offset,
guint size, GstCaps * caps, GstBuffer ** buf);
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static GstFlowReturn gst_valve_chain (GstPad * pad, GstBuffer * buffer);
static GstCaps *gst_valve_getcaps (GstPad * pad);
#define _do_init(bla) \
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GST_DEBUG_CATEGORY_INIT (valve_debug, "valve", 0, "Valve");
GST_BOILERPLATE_FULL (GstValve, gst_valve, GstElement,
GST_TYPE_ELEMENT, _do_init);
static void
gst_valve_base_init (gpointer klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&srctemplate));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sinktemplate));
gst_element_class_set_details_simple (element_class, "Valve element",
"Filter",
"This element drops all packets when drop is TRUE",
"Olivier Crete <olivier.crete@collabora.co.uk>");
}
static void
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gst_valve_class_init (GstValveClass * klass)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass *) klass;
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_valve_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_valve_get_property);
g_object_class_install_property (gobject_class, ARG_DROP,
g_param_spec_boolean ("drop",
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"Drops all buffers if TRUE",
"If this property if TRUE, the element will drop all buffers, "
"if its FALSE, it will let them through",
FALSE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}
static void
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gst_valve_init (GstValve * valve, GstValveClass * klass)
{
valve->drop = FALSE;
valve->discont = FALSE;
valve->srcpad = gst_pad_new_from_static_template (&srctemplate, "src");
gst_pad_set_getcaps_function (valve->srcpad,
GST_DEBUG_FUNCPTR (gst_valve_getcaps));
gst_element_add_pad (GST_ELEMENT (valve), valve->srcpad);
valve->sinkpad = gst_pad_new_from_static_template (&sinktemplate, "sink");
gst_pad_set_chain_function (valve->sinkpad,
GST_DEBUG_FUNCPTR (gst_valve_chain));
gst_pad_set_event_function (valve->sinkpad,
GST_DEBUG_FUNCPTR (gst_valve_event));
gst_pad_set_bufferalloc_function (valve->sinkpad,
GST_DEBUG_FUNCPTR (gst_valve_buffer_alloc));
gst_pad_set_getcaps_function (valve->sinkpad,
GST_DEBUG_FUNCPTR (gst_valve_getcaps));
gst_element_add_pad (GST_ELEMENT (valve), valve->sinkpad);
}
static void
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gst_valve_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstValve *valve = GST_VALVE (object);
switch (prop_id) {
case ARG_DROP:
g_atomic_int_set (&valve->drop, g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
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gst_valve_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstValve *valve = GST_VALVE (object);
switch (prop_id) {
case ARG_DROP:
g_value_set_boolean (value, g_atomic_int_get (&valve->drop));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstFlowReturn
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gst_valve_chain (GstPad * pad, GstBuffer * buffer)
{
GstValve *valve = GST_VALVE (gst_pad_get_parent_element (pad));
GstFlowReturn ret = GST_FLOW_OK;
if (g_atomic_int_get (&valve->drop)) {
gst_buffer_unref (buffer);
valve->discont = TRUE;
} else {
if (valve->discont) {
buffer = gst_buffer_make_metadata_writable (buffer);
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
}
ret = gst_pad_push (valve->srcpad, buffer);
}
/* Ignore errors if "drop" was changed while the thread was blocked
* downwards
*/
if (g_atomic_int_get (&valve->drop))
ret = GST_FLOW_OK;
gst_object_unref (valve);
return ret;
}
static gboolean
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gst_valve_event (GstPad * pad, GstEvent * event)
{
GstValve *valve = GST_VALVE (gst_pad_get_parent_element (pad));
gboolean ret = TRUE;
if (g_atomic_int_get (&valve->drop))
gst_event_unref (event);
else
ret = gst_pad_push_event (valve->srcpad, event);
/* Ignore errors if "drop" was changed while the thread was blocked
* downwards.
*/
if (g_atomic_int_get (&valve->drop))
ret = TRUE;
gst_object_unref (valve);
return ret;
}
static GstFlowReturn
gst_valve_buffer_alloc (GstPad * pad, guint64 offset, guint size,
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GstCaps * caps, GstBuffer ** buf)
{
GstValve *valve = GST_VALVE (gst_pad_get_parent_element (pad));
GstFlowReturn ret = GST_FLOW_OK;
if (g_atomic_int_get (&valve->drop))
*buf = NULL;
else
ret = gst_pad_alloc_buffer (valve->srcpad, offset, size, caps, buf);
/* Ignore errors if "drop" was changed while the thread was blocked
* downwards
*/
if (g_atomic_int_get (&valve->drop))
ret = GST_FLOW_OK;
gst_object_unref (valve);
return ret;
}
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static GstCaps *
gst_valve_getcaps (GstPad * pad)
{
GstValve *valve = GST_VALVE (gst_pad_get_parent (pad));
GstCaps *caps;
if (pad == valve->sinkpad)
caps = gst_pad_peer_get_caps (valve->srcpad);
else
caps = gst_pad_peer_get_caps (valve->sinkpad);
if (caps == NULL)
caps = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
gst_object_unref (valve);
return caps;
}
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static gboolean
plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "valve",
GST_RANK_MARGINAL, GST_TYPE_VALVE);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"valve",
"Valve",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)