gstreamer/plugins/elements/gstfunnel.c

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/*
* GStreamer Funnel element
*
* Copyright 2007 Collabora Ltd.
* @author: Olivier Crete <olivier.crete@collabora.co.uk>
* Copyright 2007 Nokia Corp.
*
* gstfunnel.c: Simple Funnel element
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* SECTION:element-funnel
*
* Takes packets from various input sinks into one output source.
*
* funnel always outputs a single, open ended segment from
* 0 with in %GST_FORMAT_TIME and outputs the buffers of the
* different sinkpads with timestamps that are set to the
* running time for that stream. funnel does not synchronize
* the different input streams but simply forwards all buffers
* immediately when they arrive.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstfunnel.h"
GST_DEBUG_CATEGORY_STATIC (gst_funnel_debug);
#define GST_CAT_DEFAULT gst_funnel_debug
static GstStaticPadTemplate funnel_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink_%u",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate funnel_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
#define _do_init \
GST_DEBUG_CATEGORY_INIT (gst_funnel_debug, "funnel", 0, "funnel element");
#define gst_funnel_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstFunnel, gst_funnel, GST_TYPE_ELEMENT, _do_init);
static GstPad *gst_funnel_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * name, const GstCaps * caps);
static void gst_funnel_release_pad (GstElement * element, GstPad * pad);
static GstFlowReturn gst_funnel_sink_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer);
static gboolean gst_funnel_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static void
gst_funnel_dispose (GObject * object)
{
GstFunnel *funnel = GST_FUNNEL (object);
GList *item;
gst_object_replace ((GstObject **) & funnel->last_sinkpad, NULL);
restart:
for (item = GST_ELEMENT_PADS (object); item; item = g_list_next (item)) {
GstPad *pad = GST_PAD (item->data);
if (GST_PAD_IS_SINK (pad)) {
gst_element_release_request_pad (GST_ELEMENT (object), pad);
goto restart;
}
}
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_funnel_class_init (GstFunnelClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_funnel_dispose);
gst_element_class_set_static_metadata (gstelement_class,
"Funnel pipe fitting", "Generic", "N-to-1 pipe fitting",
"Olivier Crete <olivier.crete@collabora.co.uk>");
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&funnel_sink_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&funnel_src_template));
gstelement_class->request_new_pad =
GST_DEBUG_FUNCPTR (gst_funnel_request_new_pad);
gstelement_class->release_pad = GST_DEBUG_FUNCPTR (gst_funnel_release_pad);
}
static void
gst_funnel_init (GstFunnel * funnel)
{
funnel->srcpad = gst_pad_new_from_static_template (&funnel_src_template,
"src");
gst_pad_use_fixed_caps (funnel->srcpad);
gst_element_add_pad (GST_ELEMENT (funnel), funnel->srcpad);
}
static GstPad *
gst_funnel_request_new_pad (GstElement * element, GstPadTemplate * templ,
const gchar * name, const GstCaps * caps)
{
GstPad *sinkpad;
GST_DEBUG_OBJECT (element, "requesting pad");
sinkpad = gst_pad_new_from_static_template (&funnel_sink_template, name);
2011-03-29 09:07:48 +00:00
gst_pad_set_chain_function (sinkpad,
GST_DEBUG_FUNCPTR (gst_funnel_sink_chain));
gst_pad_set_event_function (sinkpad,
GST_DEBUG_FUNCPTR (gst_funnel_sink_event));
gst_pad_set_active (sinkpad, TRUE);
gst_element_add_pad (element, sinkpad);
return sinkpad;
}
static gboolean
gst_funnel_all_sinkpads_eos_unlocked (GstFunnel * funnel)
{
GstElement *element = GST_ELEMENT_CAST (funnel);
GList *item;
if (element->numsinkpads == 0)
return FALSE;
for (item = element->sinkpads; item != NULL; item = g_list_next (item)) {
GstPad *sinkpad = item->data;
GstEvent *eos;
eos = gst_pad_get_sticky_event (sinkpad, GST_EVENT_EOS, 0);
if (eos)
gst_event_unref (eos);
if (eos == NULL)
return FALSE;
}
return TRUE;
}
static void
gst_funnel_release_pad (GstElement * element, GstPad * pad)
{
GstFunnel *funnel = GST_FUNNEL (element);
GstEvent *eos;
gboolean send_eos = FALSE;
GST_DEBUG_OBJECT (funnel, "releasing pad");
gst_pad_set_active (pad, FALSE);
eos = gst_pad_get_sticky_event (pad, GST_EVENT_EOS, 0);
if (eos)
gst_event_unref (eos);
gst_element_remove_pad (GST_ELEMENT_CAST (funnel), pad);
GST_OBJECT_LOCK (funnel);
if (eos == NULL && gst_funnel_all_sinkpads_eos_unlocked (funnel)) {
GST_DEBUG_OBJECT (funnel, "Pad removed. All others are EOS. Sending EOS");
send_eos = TRUE;
}
GST_OBJECT_UNLOCK (funnel);
if (send_eos)
if (!gst_pad_push_event (funnel->srcpad, gst_event_new_eos ()))
GST_WARNING_OBJECT (funnel, "Failure pushing EOS");
}
static gboolean
forward_events (GstPad * pad, GstEvent ** event, gpointer user_data)
{
GstPad *srcpad = user_data;
if (GST_EVENT_TYPE (*event) != GST_EVENT_EOS)
gst_pad_push_event (srcpad, gst_event_ref (*event));
return TRUE;
}
static GstFlowReturn
gst_funnel_sink_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
{
GstFlowReturn res;
GstFunnel *funnel = GST_FUNNEL (parent);
GST_DEBUG_OBJECT (funnel, "received buffer %p", buffer);
GST_PAD_STREAM_LOCK (funnel->srcpad);
if (funnel->last_sinkpad != pad) {
gst_object_replace ((GstObject **) & funnel->last_sinkpad,
GST_OBJECT (pad));
gst_pad_sticky_events_foreach (pad, forward_events, funnel->srcpad);
}
res = gst_pad_push (funnel->srcpad, buffer);
GST_PAD_STREAM_UNLOCK (funnel->srcpad);
GST_LOG_OBJECT (funnel, "handled buffer %s", gst_flow_get_name (res));
return res;
}
static gboolean
gst_funnel_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstFunnel *funnel = GST_FUNNEL (parent);
gboolean forward = TRUE;
gboolean res = TRUE;
gboolean unlock = FALSE;
if (GST_EVENT_IS_STICKY (event)) {
unlock = TRUE;
GST_PAD_STREAM_LOCK (funnel->srcpad);
if (pad != funnel->last_sinkpad)
forward = FALSE;
}
if (forward)
res = gst_pad_push_event (funnel->srcpad, event);
else
gst_event_unref (event);
if (unlock)
GST_PAD_STREAM_UNLOCK (funnel->srcpad);
return res;
}