gstreamer/ext/sctp/gstsctpdec.c
Doug Nazar 5663db236f sctp: Fix race of pad removal during reset/stop
Both reset & stop remove existing pads. Can result in warning from
gst_element_remove_pad().

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2256>
2021-05-19 05:49:48 +00:00

735 lines
22 KiB
C

/*
* Copyright (c) 2015, Collabora Ltd.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this
* list of conditions and the following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstsctpdec.h"
#include <gst/sctp/sctpreceivemeta.h>
#include <gst/base/gstdataqueue.h>
#include <stdio.h>
#include <stdlib.h>
GST_DEBUG_CATEGORY_STATIC (gst_sctp_dec_debug_category);
#define GST_CAT_DEFAULT gst_sctp_dec_debug_category
#define gst_sctp_dec_parent_class parent_class
G_DEFINE_TYPE (GstSctpDec, gst_sctp_dec, GST_TYPE_ELEMENT);
GST_ELEMENT_REGISTER_DEFINE (sctpdec, "sctpdec", GST_RANK_NONE,
GST_TYPE_SCTP_DEC);
static GstStaticPadTemplate sink_template =
GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK,
GST_PAD_ALWAYS, GST_STATIC_CAPS ("application/x-sctp"));
static GstStaticPadTemplate src_template =
GST_STATIC_PAD_TEMPLATE ("src_%u", GST_PAD_SRC,
GST_PAD_SOMETIMES, GST_STATIC_CAPS_ANY);
enum
{
SIGNAL_RESET_STREAM,
NUM_SIGNALS
};
static guint signals[NUM_SIGNALS];
enum
{
PROP_0,
PROP_GST_SCTP_ASSOCIATION_ID,
PROP_LOCAL_SCTP_PORT,
NUM_PROPERTIES
};
static GParamSpec *properties[NUM_PROPERTIES];
#define DEFAULT_GST_SCTP_ASSOCIATION_ID 1
#define DEFAULT_LOCAL_SCTP_PORT 0
#define MAX_SCTP_PORT 65535
#define MAX_GST_SCTP_ASSOCIATION_ID 65535
#define MAX_STREAM_ID 65535
GType gst_sctp_dec_pad_get_type (void);
#define GST_TYPE_SCTP_DEC_PAD (gst_sctp_dec_pad_get_type())
#define GST_SCTP_DEC_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj), GST_TYPE_SCTP_DEC_PAD, GstSctpDecPad))
#define GST_SCTP_DEC_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass), GST_TYPE_SCTP_DEC_PAD, GstSctpDecPadClass))
#define GST_IS_SCTP_DEC_PAD(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj), GST_TYPE_SCTP_DEC_PAD))
#define GST_IS_SCTP_DEC_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass), GST_TYPE_SCTP_DEC_PAD))
typedef struct _GstSctpDecPad GstSctpDecPad;
typedef GstPadClass GstSctpDecPadClass;
struct _GstSctpDecPad
{
GstPad parent;
GstDataQueue *packet_queue;
};
G_DEFINE_TYPE (GstSctpDecPad, gst_sctp_dec_pad, GST_TYPE_PAD);
static void
gst_sctp_dec_pad_finalize (GObject * object)
{
GstSctpDecPad *self = GST_SCTP_DEC_PAD (object);
gst_object_unref (self->packet_queue);
G_OBJECT_CLASS (gst_sctp_dec_pad_parent_class)->finalize (object);
}
static gboolean
data_queue_check_full_cb (GstDataQueue * queue, guint visible, guint bytes,
guint64 time, gpointer user_data)
{
/* FIXME: Are we full at some point and block? */
return FALSE;
}
static void
data_queue_empty_cb (GstDataQueue * queue, gpointer user_data)
{
}
static void
data_queue_full_cb (GstDataQueue * queue, gpointer user_data)
{
}
static void
gst_sctp_dec_pad_class_init (GstSctpDecPadClass * klass)
{
GObjectClass *gobject_class;
gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = gst_sctp_dec_pad_finalize;
}
static void
gst_sctp_dec_pad_init (GstSctpDecPad * self)
{
self->packet_queue = gst_data_queue_new (data_queue_check_full_cb,
data_queue_full_cb, data_queue_empty_cb, NULL);
}
static void gst_sctp_dec_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_sctp_dec_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_sctp_dec_finalize (GObject * object);
static GstStateChangeReturn gst_sctp_dec_change_state (GstElement * element,
GstStateChange transition);
static GstFlowReturn gst_sctp_dec_packet_chain (GstPad * pad, GstSctpDec * self,
GstBuffer * buf);
static gboolean gst_sctp_dec_packet_event (GstPad * pad, GstSctpDec * self,
GstEvent * event);
static void gst_sctp_data_srcpad_loop (GstPad * pad);
static gboolean configure_association (GstSctpDec * self);
static void on_gst_sctp_association_stream_reset (GstSctpAssociation *
gst_sctp_association, guint16 stream_id, GstSctpDec * self);
static void on_receive (GstSctpAssociation * gst_sctp_association,
guint8 * buf, gsize length, guint16 stream_id, guint ppid,
gpointer user_data);
static void stop_srcpad_task (GstPad * pad);
static void stop_all_srcpad_tasks (GstSctpDec * self);
static void sctpdec_cleanup (GstSctpDec * self);
static GstPad *get_pad_for_stream_id (GstSctpDec * self, guint16 stream_id);
static void remove_pad (GstSctpDec * self, GstPad * pad);
static void on_reset_stream (GstSctpDec * self, guint stream_id);
static void
gst_sctp_dec_class_init (GstSctpDecClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
gobject_class = G_OBJECT_CLASS (klass);
element_class = GST_ELEMENT_CLASS (klass);
GST_DEBUG_CATEGORY_INIT (gst_sctp_dec_debug_category,
"sctpdec", 0, "debug category for sctpdec element");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_template));
gobject_class->set_property = gst_sctp_dec_set_property;
gobject_class->get_property = gst_sctp_dec_get_property;
gobject_class->finalize = gst_sctp_dec_finalize;
element_class->change_state = GST_DEBUG_FUNCPTR (gst_sctp_dec_change_state);
klass->on_reset_stream = on_reset_stream;
properties[PROP_GST_SCTP_ASSOCIATION_ID] =
g_param_spec_uint ("sctp-association-id",
"SCTP Association ID",
"Every encoder/decoder pair should have the same, unique, sctp-association-id. "
"This value must be set before any pads are requested.",
0, MAX_GST_SCTP_ASSOCIATION_ID, DEFAULT_GST_SCTP_ASSOCIATION_ID,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
properties[PROP_LOCAL_SCTP_PORT] =
g_param_spec_uint ("local-sctp-port",
"Local SCTP port",
"Local sctp port for the sctp association. The remote port is configured via the "
"GstSctpEnc element.",
0, MAX_SCTP_PORT, DEFAULT_LOCAL_SCTP_PORT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
g_object_class_install_properties (gobject_class, NUM_PROPERTIES, properties);
signals[SIGNAL_RESET_STREAM] = g_signal_new ("reset-stream",
G_TYPE_FROM_CLASS (gobject_class), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (GstSctpDecClass, on_reset_stream), NULL, NULL,
NULL, G_TYPE_NONE, 1, G_TYPE_UINT);
gst_element_class_set_static_metadata (element_class,
"SCTP Decoder",
"Decoder/Network/SCTP",
"Decodes packets with SCTP",
"George Kiagiadakis <george.kiagiadakis@collabora.com>");
}
static void
gst_sctp_dec_init (GstSctpDec * self)
{
self->sctp_association_id = DEFAULT_GST_SCTP_ASSOCIATION_ID;
self->local_sctp_port = DEFAULT_LOCAL_SCTP_PORT;
self->flow_combiner = gst_flow_combiner_new ();
self->sink_pad = gst_pad_new_from_static_template (&sink_template, "sink");
gst_pad_set_chain_function (self->sink_pad,
GST_DEBUG_FUNCPTR ((GstPadChainFunction) gst_sctp_dec_packet_chain));
gst_pad_set_event_function (self->sink_pad,
GST_DEBUG_FUNCPTR ((GstPadEventFunction) gst_sctp_dec_packet_event));
gst_element_add_pad (GST_ELEMENT (self), self->sink_pad);
}
static void
gst_sctp_dec_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstSctpDec *self = GST_SCTP_DEC (object);
switch (prop_id) {
case PROP_GST_SCTP_ASSOCIATION_ID:
self->sctp_association_id = g_value_get_uint (value);
break;
case PROP_LOCAL_SCTP_PORT:
self->local_sctp_port = g_value_get_uint (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (self, prop_id, pspec);
break;
}
}
static void
gst_sctp_dec_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstSctpDec *self = GST_SCTP_DEC (object);
switch (prop_id) {
case PROP_GST_SCTP_ASSOCIATION_ID:
g_value_set_uint (value, self->sctp_association_id);
break;
case PROP_LOCAL_SCTP_PORT:
g_value_set_uint (value, self->local_sctp_port);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (self, prop_id, pspec);
break;
}
}
static void
gst_sctp_dec_finalize (GObject * object)
{
GstSctpDec *self = GST_SCTP_DEC (object);
gst_flow_combiner_free (self->flow_combiner);
self->flow_combiner = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GstStateChangeReturn
gst_sctp_dec_change_state (GstElement * element, GstStateChange transition)
{
GstSctpDec *self = GST_SCTP_DEC (element);
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_flow_combiner_reset (self->flow_combiner);
if (!configure_association (self))
ret = GST_STATE_CHANGE_FAILURE;
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
stop_all_srcpad_tasks (self);
break;
default:
break;
}
if (ret != GST_STATE_CHANGE_FAILURE)
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
sctpdec_cleanup (self);
gst_flow_combiner_reset (self->flow_combiner);
break;
default:
break;
}
return ret;
}
static GstFlowReturn
gst_sctp_dec_packet_chain (GstPad * pad, GstSctpDec * self, GstBuffer * buf)
{
GstFlowReturn flow_ret;
GstMapInfo map;
GST_DEBUG_OBJECT (self, "Processing received buffer %" GST_PTR_FORMAT, buf);
if (!gst_buffer_map (buf, &map, GST_MAP_READ)) {
GST_ERROR_OBJECT (self, "Could not map GstBuffer");
gst_buffer_unref (buf);
return GST_FLOW_ERROR;
}
gst_sctp_association_incoming_packet (self->sctp_association,
(const guint8 *) map.data, (guint32) map.size);
gst_buffer_unmap (buf, &map);
gst_buffer_unref (buf);
GST_OBJECT_LOCK (self);
/* This gets the last combined flow return from all source pads */
flow_ret = gst_flow_combiner_update_flow (self->flow_combiner, GST_FLOW_OK);
GST_OBJECT_UNLOCK (self);
if (flow_ret != GST_FLOW_OK) {
GST_DEBUG_OBJECT (self, "Returning %s", gst_flow_get_name (flow_ret));
}
return flow_ret;
}
static void
flush_srcpad (const GValue * item, gpointer user_data)
{
GstSctpDecPad *sctpdec_pad = g_value_get_object (item);
gboolean flush = GPOINTER_TO_INT (user_data);
if (flush) {
gst_data_queue_set_flushing (sctpdec_pad->packet_queue, TRUE);
gst_data_queue_flush (sctpdec_pad->packet_queue);
} else {
gst_data_queue_set_flushing (sctpdec_pad->packet_queue, FALSE);
gst_pad_start_task (GST_PAD (sctpdec_pad),
(GstTaskFunction) gst_sctp_data_srcpad_loop, sctpdec_pad, NULL);
}
}
static gboolean
gst_sctp_dec_packet_event (GstPad * pad, GstSctpDec * self, GstEvent * event)
{
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_STREAM_START:
case GST_EVENT_CAPS:
/* We create our own stream-start events and the caps event does not
* make sense */
gst_event_unref (event);
return TRUE;
case GST_EVENT_EOS:
/* Drop this, we're never EOS until shut down */
gst_event_unref (event);
return TRUE;
case GST_EVENT_FLUSH_START:{
GstIterator *it;
it = gst_element_iterate_src_pads (GST_ELEMENT (self));
while (gst_iterator_foreach (it, flush_srcpad,
GINT_TO_POINTER (TRUE)) == GST_ITERATOR_RESYNC)
gst_iterator_resync (it);
gst_iterator_free (it);
return gst_pad_event_default (pad, GST_OBJECT (self), event);
}
case GST_EVENT_FLUSH_STOP:{
GstIterator *it;
it = gst_element_iterate_src_pads (GST_ELEMENT (self));
while (gst_iterator_foreach (it, flush_srcpad,
GINT_TO_POINTER (FALSE)) == GST_ITERATOR_RESYNC)
gst_iterator_resync (it);
gst_iterator_free (it);
return gst_pad_event_default (pad, GST_OBJECT (self), event);
}
default:
return gst_pad_event_default (pad, GST_OBJECT (self), event);
}
}
static void
gst_sctp_data_srcpad_loop (GstPad * pad)
{
GstSctpDec *self;
GstSctpDecPad *sctpdec_pad = GST_SCTP_DEC_PAD (pad);
GstDataQueueItem *item;
self = GST_SCTP_DEC (gst_pad_get_parent (pad));
if (gst_data_queue_pop (sctpdec_pad->packet_queue, &item)) {
GstBuffer *buffer;
GstFlowReturn flow_ret;
buffer = GST_BUFFER (item->object);
GST_DEBUG_OBJECT (pad, "Forwarding buffer %" GST_PTR_FORMAT, buffer);
flow_ret = gst_pad_push (pad, buffer);
item->object = NULL;
GST_OBJECT_LOCK (self);
gst_flow_combiner_update_pad_flow (self->flow_combiner, pad, flow_ret);
GST_OBJECT_UNLOCK (self);
if (G_UNLIKELY (flow_ret == GST_FLOW_FLUSHING
|| flow_ret == GST_FLOW_NOT_LINKED) || flow_ret == GST_FLOW_EOS) {
GST_DEBUG_OBJECT (pad, "Push failed on packet source pad. Error: %s",
gst_flow_get_name (flow_ret));
} else if (G_UNLIKELY (flow_ret != GST_FLOW_OK)) {
GST_ERROR_OBJECT (pad, "Push failed on packet source pad. Error: %s",
gst_flow_get_name (flow_ret));
}
if (G_UNLIKELY (flow_ret != GST_FLOW_OK)) {
GST_DEBUG_OBJECT (pad, "Pausing task because of an error");
gst_data_queue_set_flushing (sctpdec_pad->packet_queue, TRUE);
gst_data_queue_flush (sctpdec_pad->packet_queue);
gst_pad_pause_task (pad);
}
item->destroy (item);
} else {
GST_OBJECT_LOCK (self);
gst_flow_combiner_update_pad_flow (self->flow_combiner, pad,
GST_FLOW_FLUSHING);
GST_OBJECT_UNLOCK (self);
GST_DEBUG_OBJECT (pad, "Pausing task because we're flushing");
gst_pad_pause_task (pad);
}
gst_object_unref (self);
}
static gboolean
configure_association (GstSctpDec * self)
{
gint state;
self->sctp_association = gst_sctp_association_get (self->sctp_association_id);
g_object_get (self->sctp_association, "state", &state, NULL);
if (state != GST_SCTP_ASSOCIATION_STATE_NEW) {
GST_WARNING_OBJECT (self,
"Could not configure SCTP association. Association already in use!");
g_object_unref (self->sctp_association);
self->sctp_association = NULL;
goto error;
}
self->signal_handler_stream_reset =
g_signal_connect_object (self->sctp_association, "stream-reset",
G_CALLBACK (on_gst_sctp_association_stream_reset), self, 0);
g_object_bind_property (self, "local-sctp-port", self->sctp_association,
"local-port", G_BINDING_SYNC_CREATE);
gst_sctp_association_set_on_packet_received (self->sctp_association,
on_receive, gst_object_ref (self), gst_object_unref);
return TRUE;
error:
return FALSE;
}
static gboolean
gst_sctp_dec_src_event (GstPad * pad, GstSctpDec * self, GstEvent * event)
{
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_RECONFIGURE:
case GST_EVENT_FLUSH_STOP:{
GstSctpDecPad *sctpdec_pad = GST_SCTP_DEC_PAD (pad);
/* Unflush and start task again */
gst_data_queue_set_flushing (sctpdec_pad->packet_queue, FALSE);
gst_pad_start_task (pad, (GstTaskFunction) gst_sctp_data_srcpad_loop, pad,
NULL);
return gst_pad_event_default (pad, GST_OBJECT (self), event);
}
case GST_EVENT_FLUSH_START:{
GstSctpDecPad *sctpdec_pad = GST_SCTP_DEC_PAD (pad);
gst_data_queue_set_flushing (sctpdec_pad->packet_queue, TRUE);
gst_data_queue_flush (sctpdec_pad->packet_queue);
return gst_pad_event_default (pad, GST_OBJECT (self), event);
}
default:
return gst_pad_event_default (pad, GST_OBJECT (self), event);
}
}
static gboolean
copy_sticky_events (GstPad * pad, GstEvent ** event, gpointer user_data)
{
GstPad *new_pad = user_data;
if (GST_EVENT_TYPE (*event) != GST_EVENT_CAPS
&& GST_EVENT_TYPE (*event) != GST_EVENT_STREAM_START)
gst_pad_store_sticky_event (new_pad, *event);
return TRUE;
}
static GstPad *
get_pad_for_stream_id (GstSctpDec * self, guint16 stream_id)
{
GstPad *new_pad = NULL;
gint state;
gchar *pad_name, *pad_stream_id;
GstPadTemplate *template;
pad_name = g_strdup_printf ("src_%hu", stream_id);
new_pad = gst_element_get_static_pad (GST_ELEMENT (self), pad_name);
if (new_pad) {
g_free (pad_name);
return new_pad;
}
g_object_get (self->sctp_association, "state", &state, NULL);
if (state != GST_SCTP_ASSOCIATION_STATE_CONNECTED) {
GST_ERROR_OBJECT (self,
"The SCTP association must be established before a new stream can be created");
return NULL;
}
GST_DEBUG_OBJECT (self, "Creating new pad for stream id %u", stream_id);
if (stream_id > MAX_STREAM_ID)
return NULL;
template = gst_static_pad_template_get (&src_template);
new_pad = g_object_new (GST_TYPE_SCTP_DEC_PAD, "name", pad_name,
"direction", template->direction, "template", template, NULL);
g_free (pad_name);
gst_clear_object (&template);
gst_pad_set_event_function (new_pad,
GST_DEBUG_FUNCPTR ((GstPadEventFunction) gst_sctp_dec_src_event));
if (!gst_pad_set_active (new_pad, TRUE))
goto error_cleanup;
pad_stream_id =
gst_pad_create_stream_id_printf (new_pad, GST_ELEMENT (self), "%hu",
stream_id);
gst_pad_push_event (new_pad, gst_event_new_stream_start (pad_stream_id));
g_free (pad_stream_id);
gst_pad_sticky_events_foreach (self->sink_pad, copy_sticky_events, new_pad);
if (!gst_element_add_pad (GST_ELEMENT (self), new_pad))
goto error_add;
GST_OBJECT_LOCK (self);
gst_flow_combiner_add_pad (self->flow_combiner, new_pad);
GST_OBJECT_UNLOCK (self);
gst_pad_start_task (new_pad, (GstTaskFunction) gst_sctp_data_srcpad_loop,
new_pad, NULL);
gst_object_ref (new_pad);
return new_pad;
error_add:
gst_pad_set_active (new_pad, FALSE);
error_cleanup:
gst_object_unref (new_pad);
return NULL;
}
static void
remove_pad (GstSctpDec * self, GstPad * pad)
{
stop_srcpad_task (pad);
GST_PAD_STREAM_LOCK (pad);
gst_pad_set_active (pad, FALSE);
if (gst_object_has_as_parent (GST_OBJECT (pad), GST_OBJECT (self)))
gst_element_remove_pad (GST_ELEMENT (self), pad);
GST_PAD_STREAM_UNLOCK (pad);
GST_OBJECT_LOCK (self);
gst_flow_combiner_remove_pad (self->flow_combiner, pad);
GST_OBJECT_UNLOCK (self);
}
static void
on_gst_sctp_association_stream_reset (GstSctpAssociation * gst_sctp_association,
guint16 stream_id, GstSctpDec * self)
{
gchar *pad_name;
GstPad *srcpad;
GST_DEBUG_OBJECT (self, "Stream %u reset", stream_id);
pad_name = g_strdup_printf ("src_%hu", stream_id);
srcpad = gst_element_get_static_pad (GST_ELEMENT (self), pad_name);
g_free (pad_name);
if (!srcpad) {
GST_WARNING_OBJECT (self, "Reset called on stream without a srcpad");
return;
}
remove_pad (self, srcpad);
gst_object_unref (srcpad);
}
static void
data_queue_item_free (GstDataQueueItem * item)
{
if (item->object)
gst_mini_object_unref (item->object);
g_free (item);
}
static void
on_receive (GstSctpAssociation * sctp_association, guint8 * buf,
gsize length, guint16 stream_id, guint ppid, gpointer user_data)
{
GstSctpDec *self = user_data;
GstSctpDecPad *sctpdec_pad;
GstPad *src_pad;
GstDataQueueItem *item;
GstBuffer *gstbuf;
src_pad = get_pad_for_stream_id (self, stream_id);
g_assert (src_pad);
GST_DEBUG_OBJECT (src_pad,
"Received incoming packet of size %" G_GSIZE_FORMAT
" with stream id %u ppid %u", length, stream_id, ppid);
sctpdec_pad = GST_SCTP_DEC_PAD (src_pad);
gstbuf =
gst_buffer_new_wrapped_full (0, buf, length, 0, length, buf,
(GDestroyNotify) usrsctp_freedumpbuffer);
gst_sctp_buffer_add_receive_meta (gstbuf, ppid);
item = g_new0 (GstDataQueueItem, 1);
item->object = GST_MINI_OBJECT (gstbuf);
item->size = length;
item->visible = TRUE;
item->destroy = (GDestroyNotify) data_queue_item_free;
if (!gst_data_queue_push (sctpdec_pad->packet_queue, item)) {
item->destroy (item);
GST_DEBUG_OBJECT (src_pad, "Failed to push item because we're flushing");
}
gst_object_unref (src_pad);
}
static void
stop_srcpad_task (GstPad * pad)
{
GstSctpDecPad *sctpdec_pad = GST_SCTP_DEC_PAD (pad);
gst_data_queue_set_flushing (sctpdec_pad->packet_queue, TRUE);
gst_data_queue_flush (sctpdec_pad->packet_queue);
gst_pad_stop_task (pad);
}
static void
remove_pad_it (const GValue * item, gpointer user_data)
{
GstPad *pad = g_value_get_object (item);
GstSctpDec *self = user_data;
remove_pad (self, pad);
}
static void
stop_all_srcpad_tasks (GstSctpDec * self)
{
GstIterator *it;
it = gst_element_iterate_src_pads (GST_ELEMENT (self));
while (gst_iterator_foreach (it, remove_pad_it, self) == GST_ITERATOR_RESYNC)
gst_iterator_resync (it);
gst_iterator_free (it);
}
static void
sctpdec_cleanup (GstSctpDec * self)
{
if (self->sctp_association) {
gst_sctp_association_set_on_packet_received (self->sctp_association, NULL,
NULL, NULL);
g_signal_handler_disconnect (self->sctp_association,
self->signal_handler_stream_reset);
gst_sctp_association_force_close (self->sctp_association);
g_object_unref (self->sctp_association);
self->sctp_association = NULL;
}
}
static void
on_reset_stream (GstSctpDec * self, guint stream_id)
{
if (self->sctp_association) {
gst_sctp_association_reset_stream (self->sctp_association, stream_id);
on_gst_sctp_association_stream_reset (self->sctp_association, stream_id,
self);
}
}