gstreamer/plugins/elements/gstfunnel.c
Srimanta Panda 6d05df01b0 funnel: Fix for racy EOS event handling
When eos events are forwarded simultaneouly from two sinkpads on
funnel, it doesnot forward the eos to sourcepad. The reason is
sticky events are stored after the event callbacks are returned.
Therefore while one is about to store the sticky events on the its
sinkpad, other sinkpad starts checking for the eos events on all other
sinkpads and assumes eos is not present yet.

https://bugzilla.gnome.org/show_bug.cgi?id=732851
2014-07-21 09:33:54 +02:00

375 lines
10 KiB
C

/*
* 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
GType gst_funnel_pad_get_type (void);
#define GST_TYPE_FUNNEL_PAD \
(gst_funnel_pad_get_type())
#define GST_FUNNEL_PAD(obj) \
(G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_FUNNEL_PAD, GstFunnelPad))
#define GST_FUNNEL_PAD_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_FUNNEL_PAD, GstFunnelPadClass))
#define GST_IS_FUNNEL_PAD(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_FUNNEL_PAD))
#define GST_IS_FUNNEL_PAD_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_FUNNEL_PAD))
#define GST_FUNNEL_PAD_CAST(obj) \
((GstFunnelPad *)(obj))
typedef struct _GstFunnelPad GstFunnelPad;
typedef struct _GstFunnelPadClass GstFunnelPadClass;
struct _GstFunnelPad
{
GstPad parent;
gboolean got_eos;
};
struct _GstFunnelPadClass
{
GstPadClass parent;
};
G_DEFINE_TYPE (GstFunnelPad, gst_funnel_pad, GST_TYPE_PAD);
static void
gst_funnel_pad_class_init (GstFunnelPadClass * klass)
{
}
static void
gst_funnel_pad_init (GstFunnelPad * pad)
{
pad->got_eos = FALSE;
}
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 GstStateChangeReturn gst_funnel_change_state (GstElement * element,
GstStateChange transition);
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);
gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_funnel_change_state);
}
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_CAST (g_object_new (GST_TYPE_FUNNEL_PAD,
"name", name, "direction", templ->direction, "template", templ,
NULL));
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_OBJECT_FLAG_SET (sinkpad, GST_PAD_FLAG_PROXY_CAPS);
GST_OBJECT_FLAG_SET (sinkpad, GST_PAD_FLAG_PROXY_ALLOCATION);
gst_pad_set_active (sinkpad, TRUE);
gst_element_add_pad (element, sinkpad);
return sinkpad;
}
static gboolean
gst_funnel_all_sinkpads_eos_unlocked (GstFunnel * funnel, GstPad * pad)
{
GstElement *element = GST_ELEMENT_CAST (funnel);
GList *item;
gboolean all_eos = FALSE;
if (element->numsinkpads == 0)
goto done;
for (item = element->sinkpads; item != NULL; item = g_list_next (item)) {
GstFunnelPad *sinkpad = GST_FUNNEL_PAD_CAST (item->data);
if (sinkpad->got_eos == FALSE) {
return FALSE;
}
}
all_eos = TRUE;
done:
return all_eos;
}
static void
gst_funnel_release_pad (GstElement * element, GstPad * pad)
{
GstFunnel *funnel = GST_FUNNEL (element);
GstFunnelPad *fpad = GST_FUNNEL_PAD_CAST (pad);
gboolean got_eos;
gboolean send_eos = FALSE;
GST_DEBUG_OBJECT (funnel, "releasing pad");
gst_pad_set_active (pad, FALSE);
got_eos = fpad->got_eos;
gst_element_remove_pad (GST_ELEMENT_CAST (funnel), pad);
GST_OBJECT_LOCK (funnel);
if (!got_eos && gst_funnel_all_sinkpads_eos_unlocked (funnel, NULL)) {
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);
GstFunnelPad *fpad = GST_FUNNEL_PAD_CAST (pad);
gboolean forward = TRUE;
gboolean res = TRUE;
gboolean unlock = FALSE;
if (GST_EVENT_IS_STICKY (event)) {
unlock = TRUE;
GST_PAD_STREAM_LOCK (funnel->srcpad);
if (GST_EVENT_TYPE (event) == GST_EVENT_EOS) {
GST_OBJECT_LOCK (funnel);
fpad->got_eos = TRUE;
if (!gst_funnel_all_sinkpads_eos_unlocked (funnel, pad)) {
forward = FALSE;
} else {
forward = TRUE;
}
GST_OBJECT_UNLOCK (funnel);
} else if (pad != funnel->last_sinkpad) {
forward = FALSE;
}
} else if (GST_EVENT_TYPE (event) == GST_EVENT_FLUSH_STOP) {
unlock = TRUE;
GST_PAD_STREAM_LOCK (funnel->srcpad);
GST_OBJECT_LOCK (funnel);
fpad->got_eos = FALSE;
GST_OBJECT_UNLOCK (funnel);
}
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;
}
static void
reset_pad (const GValue * data, gpointer user_data)
{
GstPad *pad = g_value_get_object (data);
GstFunnelPad *fpad = GST_FUNNEL_PAD_CAST (pad);
GST_OBJECT_LOCK (pad);
fpad->got_eos = FALSE;
GST_OBJECT_UNLOCK (pad);
}
static GstStateChangeReturn
gst_funnel_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret;
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
{
GstIterator *iter = gst_element_iterate_sink_pads (element);
GstIteratorResult res;
do {
res = gst_iterator_foreach (iter, reset_pad, NULL);
} while (res == GST_ITERATOR_RESYNC);
gst_iterator_free (iter);
if (res == GST_ITERATOR_ERROR)
return GST_STATE_CHANGE_FAILURE;
}
break;
default:
break;
}
return ret;
}