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gstreamer/gst/tcp/gstmultifdsink.c
Thomas Vander Stichele 6141dbe95f fix debug levels 
Original commit message from CVS:
fix debug levels
2004-08-16 15:48:27 +00:00

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) <2004> Thomas Vander Stichele <thomas at apestaart dot 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-i18n-plugin.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#ifdef HAVE_FIONREAD_IN_SYS_FILIO
#include <sys/filio.h>
#endif
#include "gstmultifdsink.h"
#include "gsttcp-marshal.h"
#define NOT_IMPLEMENTED 0
/* the select call is also performed on the control sockets, that way
* we can send special commands to unblock or restart the select call */
#define CONTROL_RESTART 'R' /* restart the select call */
#define CONTROL_STOP 'S' /* stop the select call */
#define CONTROL_SOCKETS(sink) sink->control_sock
#define WRITE_SOCKET(sink) sink->control_sock[1]
#define READ_SOCKET(sink) sink->control_sock[0]
#define SEND_COMMAND(sink, command) \
G_STMT_START { \
unsigned char c; c = command; \
write (WRITE_SOCKET(sink).fd, &c, 1); \
} G_STMT_END
#define READ_COMMAND(sink, command, res) \
G_STMT_START { \
res = read(READ_SOCKET(sink).fd, &command, 1); \
} G_STMT_END
/* elementfactory information */
static GstElementDetails gst_multifdsink_details =
GST_ELEMENT_DETAILS ("MultiFd sink",
"Sink/Network",
"Send data to multiple filedescriptors",
"Thomas Vander Stichele <thomas at apestaart dot org>, "
"Wim Taymans <wim@fluendo.com>");
GST_DEBUG_CATEGORY (multifdsink_debug);
#define GST_CAT_DEFAULT (multifdsink_debug)
/* MultiFdSink signals and args */
enum
{
/* methods */
SIGNAL_ADD,
SIGNAL_REMOVE,
SIGNAL_CLEAR,
SIGNAL_GET_STATS,
/* signals */
SIGNAL_CLIENT_ADDED,
SIGNAL_CLIENT_REMOVED,
LAST_SIGNAL
};
/* this is really arbitrary choosen */
#define DEFAULT_PROTOCOL GST_TCP_PROTOCOL_TYPE_NONE
#define DEFAULT_MODE GST_FDSET_MODE_POLL
#define DEFAULT_BUFFERS_MAX -1
#define DEFAULT_BUFFERS_SOFT_MAX -1
#define DEFAULT_UNIT_TYPE GST_UNIT_TYPE_BUFFERS
#define DEFAULT_UNITS_MAX -1
#define DEFAULT_UNITS_SOFT_MAX -1
#define DEFAULT_RECOVER_POLICY GST_RECOVER_POLICY_NONE
#define DEFAULT_TIMEOUT 0
enum
{
ARG_0,
ARG_PROTOCOL,
ARG_MODE,
ARG_BUFFERS_QUEUED,
ARG_BYTES_QUEUED,
ARG_TIME_QUEUED,
ARG_UNIT_TYPE,
ARG_UNITS_MAX,
ARG_UNITS_SOFT_MAX,
ARG_BUFFERS_MAX,
ARG_BUFFERS_SOFT_MAX,
ARG_RECOVER_POLICY,
ARG_TIMEOUT,
ARG_BYTES_TO_SERVE,
ARG_BYTES_SERVED,
};
#define GST_TYPE_RECOVER_POLICY (gst_recover_policy_get_type())
static GType
gst_recover_policy_get_type (void)
{
static GType recover_policy_type = 0;
static GEnumValue recover_policy[] = {
{GST_RECOVER_POLICY_NONE, "GST_RECOVER_POLICY_NONE",
"Do not try to recover"},
{GST_RECOVER_POLICY_RESYNC_START, "GST_RECOVER_POLICY_RESYNC_START",
"Resync client to most recent buffer"},
{GST_RECOVER_POLICY_RESYNC_SOFT, "GST_RECOVER_POLICY_RESYNC_SOFT",
"Resync client to soft limit"},
{GST_RECOVER_POLICY_RESYNC_KEYFRAME, "GST_RECOVER_POLICY_RESYNC_KEYFRAME",
"Resync client to most recent keyframe"},
{0, NULL, NULL},
};
if (!recover_policy_type) {
recover_policy_type =
g_enum_register_static ("GstTCPRecoverPolicy", recover_policy);
}
return recover_policy_type;
}
#if NOT_IMPLEMENTED
#define GST_TYPE_UNIT_TYPE (gst_unit_type_get_type())
static GType
gst_unit_type_get_type (void)
{
static GType unit_type_type = 0;
static GEnumValue unit_type[] = {
{GST_UNIT_TYPE_BUFFERS, "GST_UNIT_TYPE_BUFFERS", "Buffers"},
{GST_UNIT_TYPE_BYTES, "GST_UNIT_TYPE_BYTES", "Bytes"},
{GST_UNIT_TYPE_TIME, "GST_UNIT_TYPE_TIME", "Time"},
{0, NULL, NULL},
};
if (!unit_type_type) {
unit_type_type = g_enum_register_static ("GstTCPUnitType", unit_type);
}
return unit_type_type;
}
#endif
#define GST_TYPE_CLIENT_STATUS (gst_client_status_get_type())
static GType
gst_client_status_get_type (void)
{
static GType client_status_type = 0;
static GEnumValue client_status[] = {
{GST_CLIENT_STATUS_OK, "GST_CLIENT_STATUS_OK", "OK"},
{GST_CLIENT_STATUS_CLOSED, "GST_CLIENT_STATUS_CLOSED", "Closed"},
{GST_CLIENT_STATUS_REMOVED, "GST_CLIENT_STATUS_REMOVED", "Removed"},
{GST_CLIENT_STATUS_SLOW, "GST_CLIENT_STATUS_SLOW", "Too slow"},
{GST_CLIENT_STATUS_ERROR, "GST_CLIENT_STATUS_ERROR", "Error"},
{0, NULL, NULL},
};
if (!client_status_type) {
client_status_type =
g_enum_register_static ("GstTCPClientStatus", client_status);
}
return client_status_type;
}
static void gst_multifdsink_base_init (gpointer g_class);
static void gst_multifdsink_class_init (GstMultiFdSinkClass * klass);
static void gst_multifdsink_init (GstMultiFdSink * multifdsink);
static void gst_multifdsink_remove_client_link (GstMultiFdSink * sink,
GList * link);
static void gst_multifdsink_chain (GstPad * pad, GstData * _data);
static GstElementStateReturn gst_multifdsink_change_state (GstElement *
element);
static void gst_multifdsink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_multifdsink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstElementClass *parent_class = NULL;
static guint gst_multifdsink_signals[LAST_SIGNAL] = { 0 };
GType
gst_multifdsink_get_type (void)
{
static GType multifdsink_type = 0;
if (!multifdsink_type) {
static const GTypeInfo multifdsink_info = {
sizeof (GstMultiFdSinkClass),
gst_multifdsink_base_init,
NULL,
(GClassInitFunc) gst_multifdsink_class_init,
NULL,
NULL,
sizeof (GstMultiFdSink),
0,
(GInstanceInitFunc) gst_multifdsink_init,
NULL
};
multifdsink_type =
g_type_register_static (GST_TYPE_ELEMENT, "GstMultiFdSink",
&multifdsink_info, 0);
}
return multifdsink_type;
}
static void
gst_multifdsink_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (element_class, &gst_multifdsink_details);
}
static void
gst_multifdsink_class_init (GstMultiFdSinkClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
g_object_class_install_property (gobject_class, ARG_PROTOCOL,
g_param_spec_enum ("protocol", "Protocol", "The protocol to wrap data in",
GST_TYPE_TCP_PROTOCOL_TYPE, DEFAULT_PROTOCOL, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, ARG_MODE,
g_param_spec_enum ("mode", "Mode",
"The mode for selecting activity on the fds", GST_TYPE_FDSET_MODE,
DEFAULT_MODE, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BUFFERS_MAX,
g_param_spec_int ("buffers-max", "Buffers max",
"max number of buffers to queue (-1 = no limit)", -1, G_MAXINT,
DEFAULT_BUFFERS_MAX, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BUFFERS_SOFT_MAX,
g_param_spec_int ("buffers-soft-max", "Buffers soft max",
"Recover client when going over this limit (-1 = no limit)", -1,
G_MAXINT, DEFAULT_BUFFERS_SOFT_MAX, G_PARAM_READWRITE));
#if NOT_IMPLEMENTED
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_UNIT_TYPE,
g_param_spec_enum ("unit-type", "Units type",
"The unit to measure the max/soft-max/queued properties",
GST_TYPE_UNIT_TYPE, DEFAULT_UNIT_TYPE, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_UNITS_MAX,
g_param_spec_int ("units-max", "Units max",
"max number of units to queue (-1 = no limit)", -1, G_MAXINT,
DEFAULT_UNITS_MAX, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_UNITS_SOFT_MAX,
g_param_spec_int ("units-soft-max", "Units soft max",
"Recover client when going over this limit (-1 = no limit)", -1,
G_MAXINT, DEFAULT_UNITS_SOFT_MAX, G_PARAM_READWRITE));
#endif
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BUFFERS_QUEUED,
g_param_spec_uint ("buffers-queued", "Buffers queued",
"Number of buffers currently queued", 0, G_MAXUINT, 0,
G_PARAM_READABLE));
#if NOT_IMPLEMENTED
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BYTES_QUEUED,
g_param_spec_uint ("bytes-queued", "Bytes queued",
"Number of bytes currently queued", 0, G_MAXUINT, 0,
G_PARAM_READABLE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_TIME_QUEUED,
g_param_spec_uint64 ("time-queued", "Time queued",
"Number of time currently queued", 0, G_MAXUINT64, 0,
G_PARAM_READABLE));
#endif
g_object_class_install_property (gobject_class, ARG_RECOVER_POLICY,
g_param_spec_enum ("recover-policy", "Recover Policy",
"How to recover when client reaches the soft max",
GST_TYPE_RECOVER_POLICY, DEFAULT_RECOVER_POLICY, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_TIMEOUT,
g_param_spec_uint64 ("timeout", "Timeout",
"Maximum inactivity timeout in nanoseconds for a client (0 = no limit)",
0, G_MAXUINT64, DEFAULT_TIMEOUT, G_PARAM_READABLE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BYTES_TO_SERVE,
g_param_spec_uint64 ("bytes-to-serve", "Bytes to serve",
"Number of bytes received to serve to clients", 0, G_MAXUINT64, 0,
G_PARAM_READABLE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BYTES_SERVED,
g_param_spec_uint64 ("bytes-served", "Bytes served",
"Total number of bytes send to all clients", 0, G_MAXUINT64, 0,
G_PARAM_READABLE));
gst_multifdsink_signals[SIGNAL_ADD] =
g_signal_new ("add", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstMultiFdSinkClass, add),
NULL, NULL, g_cclosure_marshal_VOID__INT, G_TYPE_NONE, 1, G_TYPE_INT);
gst_multifdsink_signals[SIGNAL_REMOVE] =
g_signal_new ("remove", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstMultiFdSinkClass, remove),
NULL, NULL, gst_tcp_marshal_VOID__INT, G_TYPE_NONE, 1, G_TYPE_INT);
gst_multifdsink_signals[SIGNAL_CLEAR] =
g_signal_new ("clear", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstMultiFdSinkClass, clear),
NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
gst_multifdsink_signals[SIGNAL_GET_STATS] =
g_signal_new ("get-stats", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstMultiFdSinkClass, get_stats),
NULL, NULL, gst_tcp_marshal_BOXED__INT, G_TYPE_VALUE_ARRAY, 1,
G_TYPE_INT);
gst_multifdsink_signals[SIGNAL_CLIENT_ADDED] =
g_signal_new ("client-added", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstMultiFdSinkClass, client_added),
NULL, NULL, gst_tcp_marshal_VOID__INT, G_TYPE_NONE, 1, G_TYPE_INT);
gst_multifdsink_signals[SIGNAL_CLIENT_REMOVED] =
g_signal_new ("client-removed", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstMultiFdSinkClass,
client_removed), NULL, NULL, gst_tcp_marshal_VOID__INT_BOXED,
G_TYPE_NONE, 2, G_TYPE_INT, GST_TYPE_CLIENT_STATUS);
gobject_class->set_property = gst_multifdsink_set_property;
gobject_class->get_property = gst_multifdsink_get_property;
gstelement_class->change_state = gst_multifdsink_change_state;
klass->add = gst_multifdsink_add;
klass->remove = gst_multifdsink_remove;
klass->clear = gst_multifdsink_clear;
klass->get_stats = gst_multifdsink_get_stats;
GST_DEBUG_CATEGORY_INIT (multifdsink_debug, "multifdsink", 0, "FD sink");
}
static void
gst_multifdsink_init (GstMultiFdSink * this)
{
/* create the sink pad */
this->sinkpad = gst_pad_new ("sink", GST_PAD_SINK);
gst_element_add_pad (GST_ELEMENT (this), this->sinkpad);
gst_pad_set_chain_function (this->sinkpad, gst_multifdsink_chain);
GST_FLAG_UNSET (this, GST_MULTIFDSINK_OPEN);
this->protocol = DEFAULT_PROTOCOL;
this->mode = DEFAULT_MODE;
this->clientslock = g_mutex_new ();
this->clients = NULL;
this->bufqueue = g_array_new (FALSE, TRUE, sizeof (GstBuffer *));
this->unit_type = DEFAULT_UNIT_TYPE;
this->units_max = DEFAULT_UNITS_MAX;
this->units_soft_max = DEFAULT_UNITS_SOFT_MAX;
this->recover_policy = DEFAULT_RECOVER_POLICY;
this->timeout = DEFAULT_TIMEOUT;
}
void
gst_multifdsink_add (GstMultiFdSink * sink, int fd)
{
GstTCPClient *client;
GTimeVal now;
GST_DEBUG_OBJECT (sink, "adding client on fd %d", fd);
/* create client datastructure */
client = g_new0 (GstTCPClient, 1);
client->fd.fd = fd;
client->status = GST_CLIENT_STATUS_OK;
client->bufpos = -1;
client->bufoffset = 0;
client->sending = NULL;
client->bytes_sent = 0;
client->dropped_buffers = 0;
client->avg_queue_size = 0;
/* update start time */
g_get_current_time (&now);
client->connect_time = GST_TIMEVAL_TO_TIME (now);
client->disconnect_time = 0;
/* send last activity time to connect time */
client->last_activity_time = GST_TIMEVAL_TO_TIME (now);
g_mutex_lock (sink->clientslock);
sink->clients = g_list_prepend (sink->clients, client);
/* set the socket to non blocking */
fcntl (fd, F_SETFL, O_NONBLOCK);
/* we always read from a client */
gst_fdset_add_fd (sink->fdset, &client->fd);
gst_fdset_fd_ctl_read (sink->fdset, &client->fd, TRUE);
SEND_COMMAND (sink, CONTROL_RESTART);
g_mutex_unlock (sink->clientslock);
g_signal_emit (G_OBJECT (sink),
gst_multifdsink_signals[SIGNAL_CLIENT_ADDED], 0, fd);
}
void
gst_multifdsink_remove (GstMultiFdSink * sink, int fd)
{
GList *clients, *next;
GST_DEBUG_OBJECT (sink, "removing client on fd %d", fd);
g_mutex_lock (sink->clientslock);
/* loop over the clients to find the one with the fd */
for (clients = sink->clients; clients; clients = next) {
GstTCPClient *client;
client = (GstTCPClient *) clients->data;
next = g_list_next (clients);
if (client->fd.fd == fd) {
client->status = GST_CLIENT_STATUS_REMOVED;
gst_multifdsink_remove_client_link (sink, clients);
SEND_COMMAND (sink, CONTROL_RESTART);
break;
}
}
g_mutex_unlock (sink->clientslock);
}
void
gst_multifdsink_clear (GstMultiFdSink * sink)
{
GList *clients, *next;
GST_DEBUG_OBJECT (sink, "clearing all clients");
g_mutex_lock (sink->clientslock);
for (clients = sink->clients; clients; clients = next) {
GstTCPClient *client;
client = (GstTCPClient *) clients->data;
next = g_list_next (clients);
client->status = GST_CLIENT_STATUS_REMOVED;
gst_multifdsink_remove_client_link (sink, clients);
}
SEND_COMMAND (sink, CONTROL_RESTART);
g_mutex_unlock (sink->clientslock);
}
GValueArray *
gst_multifdsink_get_stats (GstMultiFdSink * sink, int fd)
{
GList *clients;
GValueArray *result = NULL;
g_mutex_lock (sink->clientslock);
/* loop over the clients to find the one with the fd */
for (clients = sink->clients; clients; clients = g_list_next (clients)) {
GstTCPClient *client;
client = (GstTCPClient *) clients->data;
if (client->fd.fd == fd) {
GValue value = { 0 };
guint64 interval;
result = g_value_array_new (4);
g_value_init (&value, G_TYPE_UINT64);
g_value_set_uint64 (&value, client->bytes_sent);
result = g_value_array_append (result, &value);
g_value_unset (&value);
g_value_init (&value, G_TYPE_UINT64);
g_value_set_uint64 (&value, client->connect_time);
result = g_value_array_append (result, &value);
g_value_unset (&value);
if (client->disconnect_time == 0) {
GTimeVal nowtv;
g_get_current_time (&nowtv);
interval = GST_TIMEVAL_TO_TIME (nowtv) - client->connect_time;
} else {
interval = client->disconnect_time - client->connect_time;
}
g_value_init (&value, G_TYPE_UINT64);
g_value_set_uint64 (&value, client->disconnect_time);
result = g_value_array_append (result, &value);
g_value_unset (&value);
g_value_init (&value, G_TYPE_UINT64);
g_value_set_uint64 (&value, interval);
result = g_value_array_append (result, &value);
g_value_unset (&value);
g_value_init (&value, G_TYPE_UINT64);
g_value_set_uint64 (&value, client->last_activity_time);
result = g_value_array_append (result, &value);
break;
}
}
g_mutex_unlock (sink->clientslock);
/* python doesn't like a NULL pointer yet */
if (result == NULL) {
result = g_value_array_new (0);
}
return result;
}
/* should be called with the clientslock held */
static void
gst_multifdsink_remove_client_link (GstMultiFdSink * sink, GList * link)
{
int fd;
GTimeVal now;
GstTCPClient *client = (GstTCPClient *) link->data;
fd = client->fd.fd;
/* FIXME: if we keep track of ip we can log it here and signal */
switch (client->status) {
case GST_CLIENT_STATUS_OK:
GST_WARNING_OBJECT (sink, "removing client %p with fd %d for no reason",
client, fd);
break;
case GST_CLIENT_STATUS_CLOSED:
GST_DEBUG_OBJECT (sink, "removing client %p with fd %d because of close",
client, fd);
break;
case GST_CLIENT_STATUS_REMOVED:
GST_DEBUG_OBJECT (sink,
"removing client %p with fd %d because the app removed it", client,
fd);
break;
case GST_CLIENT_STATUS_SLOW:
GST_INFO_OBJECT (sink,
"removing client %p with fd %d because it was too slow", client, fd);
break;
case GST_CLIENT_STATUS_ERROR:
GST_WARNING_OBJECT (sink,
"removing client %p with fd %d because of error", client, fd);
break;
default:
GST_WARNING_OBJECT (sink,
"removing client %p with fd %d with invalid reason", client, fd);
break;
}
gst_fdset_remove_fd (sink->fdset, &client->fd);
if (close (fd) != 0) {
/* this is not really an error */
GST_DEBUG_OBJECT (sink, "error closing fd %d: %s", fd, g_strerror (errno));
}
g_get_current_time (&now);
client->disconnect_time = GST_TIMEVAL_TO_TIME (now);
/* unlock the mutex before signaling because the signal handler
* might query some properties */
g_mutex_unlock (sink->clientslock);
g_signal_emit (G_OBJECT (sink),
gst_multifdsink_signals[SIGNAL_CLIENT_REMOVED], 0, fd, client->status);
/* lock again before we remove the client completely */
g_mutex_lock (sink->clientslock);
sink->clients = g_list_delete_link (sink->clients, link);
g_free (client);
}
/* handle a read on a client fd,
* which either indicates a close or should be ignored
* returns FALSE if some error occured or the client closed. */
static gboolean
gst_multifdsink_handle_client_read (GstMultiFdSink * sink,
GstTCPClient * client)
{
int avail, fd;
gboolean ret;
fd = client->fd.fd;
if (ioctl (fd, FIONREAD, &avail) < 0) {
GST_WARNING_OBJECT (sink, "ioctl failed for fd %d: %s",
fd, g_strerror (errno));
client->status = GST_CLIENT_STATUS_ERROR;
ret = FALSE;
return ret;
}
GST_DEBUG_OBJECT (sink, "select reports client read on fd %d of %d bytes",
fd, avail);
ret = TRUE;
if (avail == 0) {
/* client sent close, so remove it */
GST_DEBUG_OBJECT (sink, "client asked for close, removing on fd %d", fd);
client->status = GST_CLIENT_STATUS_CLOSED;
ret = FALSE;
} else if (avail < 0) {
GST_WARNING_OBJECT (sink, "avail < 0, removing on fd %d", fd);
client->status = GST_CLIENT_STATUS_ERROR;
ret = FALSE;
} else {
guint8 dummy[512];
gint nread;
/* just Read 'n' Drop, could also just drop the client as it's not supposed
* to write to us except for closing the socket, I guess it's because we
* like to listen to our customers. */
do {
/* this is the maximum we can read */
gint to_read = MIN (avail, 512);
GST_DEBUG_OBJECT (sink, "client on fd %d wants us to read %d bytes",
fd, to_read);
nread = read (fd, dummy, to_read);
if (nread < -1) {
GST_WARNING_OBJECT (sink, "could not read bytes from fd %d: %s",
fd, g_strerror (errno));
client->status = GST_CLIENT_STATUS_ERROR;
ret = FALSE;
break;
} else if (nread == 0) {
GST_WARNING_OBJECT (sink, "fd %d: gave 0 bytes in read, removing", fd);
client->status = GST_CLIENT_STATUS_ERROR;
ret = FALSE;
break;
}
avail -= nread;
}
while (avail > 0);
}
return ret;
}
static gboolean
gst_multifdsink_client_queue_data (GstMultiFdSink * sink, GstTCPClient * client,
gchar * data, gint len)
{
GstBuffer *buf;
buf = gst_buffer_new ();
GST_BUFFER_DATA (buf) = data;
GST_BUFFER_SIZE (buf) = len;
GST_LOG_OBJECT (sink, "Queueing data of length %d for fd %d",
len, client->fd.fd);
client->sending = g_slist_append (client->sending, buf);
return TRUE;
}
static gboolean
gst_multifdsink_client_queue_caps (GstMultiFdSink * sink, GstTCPClient * client,
const GstCaps * caps)
{
guint8 *header;
guint8 *payload;
guint length;
gchar *string;
string = gst_caps_to_string (caps);
GST_DEBUG_OBJECT (sink, "Queueing caps %s for fd %d through GDP", string,
client->fd.fd);
g_free (string);
if (!gst_dp_packet_from_caps (caps, 0, &length, &header, &payload)) {
GST_DEBUG_OBJECT (sink, "Could not create GDP packet from caps");
return FALSE;
}
gst_multifdsink_client_queue_data (sink, client, header, length);
length = gst_dp_header_payload_length (header);
gst_multifdsink_client_queue_data (sink, client, payload, length);
return TRUE;
}
static gboolean
gst_multifdsink_client_queue_buffer (GstMultiFdSink * sink,
GstTCPClient * client, GstBuffer * buffer)
{
if (sink->protocol == GST_TCP_PROTOCOL_TYPE_GDP) {
guint8 *header;
guint len;
if (!gst_dp_header_from_buffer (buffer, 0, &len, &header)) {
GST_DEBUG_OBJECT (sink,
"could not create header, removing client on fd %d", client->fd.fd);
return FALSE;
}
gst_multifdsink_client_queue_data (sink, client, header, len);
}
gst_buffer_ref (buffer);
client->sending = g_slist_append (client->sending, buffer);
return TRUE;
}
/* handle a write on a client,
* which indicates a read request from a client.
*
* The strategy is as follows, for each client we maintain a queue of GstBuffers
* that contain the raw bytes we need to send to the client. In the case of the
* GDP protocol, we create buffers out of the header bytes so that we can only focus
* on sending buffers.
*
* We first check to see if we need to send caps (in GDP) and streamheaders. If so,
* we queue them.
*
* Then we run into the main loop that tries to send as many buffers as possible. It
* will first exhaust the client->sending queue and if the queue is empty, it will
* pick a buffer from the global queue.
*
* Sending the Buffers from the client->sending queue is basically writing the bytes
* to the socket and maintaining a count of the bytes that were sent. When the buffer
* is completely sent, it is removed from the client->sending queue and we try to pick
* a new buffer for sending.
*
* When the sending returns a partial buffer we stop sending more data as the next send
* operation could block.
*
* This functions returns FALSE if some error occured.
*/
static gboolean
gst_multifdsink_handle_client_write (GstMultiFdSink * sink,
GstTCPClient * client)
{
int fd = client->fd.fd;
gboolean more;
gboolean res;
GstClockTime now;
GTimeVal nowtv;
g_get_current_time (&nowtv);
now = GST_TIMEVAL_TO_TIME (nowtv);
/* when using GDP, first check if we have queued caps yet */
if (sink->protocol == GST_TCP_PROTOCOL_TYPE_GDP) {
if (!client->caps_sent) {
const GstCaps *caps = GST_PAD_CAPS (GST_PAD_PEER (sink->sinkpad));
/* queue caps for sending */
res = gst_multifdsink_client_queue_caps (sink, client, caps);
if (!res) {
GST_DEBUG_OBJECT (sink, "Failed queueing caps, removing client");
return FALSE;
}
client->caps_sent = TRUE;
}
}
/* if we have streamheader buffers, and haven't sent them to this client
* yet, send them out one by one */
if (!client->streamheader_sent) {
if (sink->streamheader) {
GSList *l;
for (l = sink->streamheader; l; l = l->next) {
/* queue stream headers for sending */
res =
gst_multifdsink_client_queue_buffer (sink, client,
GST_BUFFER (l->data));
if (!res) {
GST_DEBUG_OBJECT (sink,
"Failed queueing streamheader, removing client");
return FALSE;
}
}
}
client->streamheader_sent = TRUE;
}
more = TRUE;
do {
gint maxsize;
if (!client->sending) {
/* client is not working on a buffer */
if (client->bufpos == -1) {
/* client is too fast, remove from write queue until new buffer is
* available */
gst_fdset_fd_ctl_write (sink->fdset, &client->fd, FALSE);
return TRUE;
} else {
/* client can pick a buffer from the global queue */
GstBuffer *buf;
/* grab buffer */
buf = g_array_index (sink->bufqueue, GstBuffer *, client->bufpos);
client->bufpos--;
/* queueing a buffer will ref it */
gst_multifdsink_client_queue_buffer (sink, client, buf);
/* need to start from the first byte for this new buffer */
client->bufoffset = 0;
}
}
/* see if we need to send something */
if (client->sending) {
ssize_t wrote;
GstBuffer *head;
/* pick first buffer from list */
head = GST_BUFFER (client->sending->data);
maxsize = GST_BUFFER_SIZE (head) - client->bufoffset;
/* try to write the complete buffer */
#ifdef MSG_NOSIGNAL
#define FLAGS MSG_NOSIGNAL
#else
#define FLAGS 0
#endif
wrote =
send (fd, GST_BUFFER_DATA (head) + client->bufoffset, maxsize, FLAGS);
if (wrote < 0) {
/* hmm error.. */
if (errno == EAGAIN) {
/* nothing serious, resource was unavailable, try again later */
more = FALSE;
} else {
GST_WARNING_OBJECT (sink, "could not write, removing client on fd %d",
fd);
client->status = GST_CLIENT_STATUS_ERROR;
return FALSE;
}
} else {
if (wrote < maxsize) {
/* partial write means that the client cannot read more and we should
* stop sending more */
GST_LOG_OBJECT (sink, "partial write on %d of %d bytes", fd, wrote);
client->bufoffset += wrote;
more = FALSE;
} else {
/* complete buffer was written, we can proceed to the next one */
client->sending = g_slist_remove (client->sending, head);
gst_buffer_unref (head);
/* make sure we start from byte 0 for the next buffer */
client->bufoffset = 0;
}
/* update stats */
client->bytes_sent += wrote;
client->last_activity_time = now;
sink->bytes_served += wrote;
}
}
} while (more);
return TRUE;
}
/* calculate the new position for a client after recovery. This function
* does not update the client position but merely returns the required
* position.
*/
static gint
gst_multifdsink_recover_client (GstMultiFdSink * sink, GstTCPClient * client)
{
gint newbufpos;
GST_WARNING_OBJECT (sink,
"client %p with fd %d is lagging at %d, recover using policy %d", client,
client->fd.fd, client->bufpos, sink->recover_policy);
switch (sink->recover_policy) {
case GST_RECOVER_POLICY_NONE:
/* do nothing, client will catch up or get kicked out when it reaches
* the hard max */
newbufpos = client->bufpos;
break;
case GST_RECOVER_POLICY_RESYNC_START:
/* move to beginning of queue */
newbufpos = -1;
break;
case GST_RECOVER_POLICY_RESYNC_SOFT:
/* move to beginning of soft max */
newbufpos = sink->units_soft_max;
break;
case GST_RECOVER_POLICY_RESYNC_KEYFRAME:
/* FIXME, find keyframe in buffers */
newbufpos = sink->units_soft_max;
break;
default:
/* unknown recovery procedure */
newbufpos = sink->units_soft_max;
break;
}
return newbufpos;
}
/* Queue a buffer on the global queue.
*
* This functions adds the buffer to the front of a GArray. It removes the
* tail buffer if the max queue size is exceeded. Unreffing the buffer that
* is queued. Note that unreffing the buffer is not a problem as clients who
* started writing out this buffer will still have a reference to it in the
* client->sending queue.
*
* After adding the buffer, we update all client positions in the queue. If
* a client moves of the soft max, we start the recovery procedure for this
* slow client. If it goes over the hard max, it is put into the slow list
* and removed.
*
* Special care is taken of clients that were waiting for a new buffer (they
* had a position of -1) because they can proceed after adding this new buffer.
* This is done by adding the client back into the write fd_set and signalling
* the select thread that the fd_set changed.
*
*/
static void
gst_multifdsink_queue_buffer (GstMultiFdSink * sink, GstBuffer * buf)
{
GList *clients, *next;
gint queuelen;
gboolean need_signal = FALSE;
gint max_buffer_usage;
gint i;
GTimeVal nowtv;
GstClockTime now;
g_get_current_time (&nowtv);
now = GST_TIMEVAL_TO_TIME (nowtv);
g_mutex_lock (sink->clientslock);
/* add buffer to queue */
g_array_prepend_val (sink->bufqueue, buf);
queuelen = sink->bufqueue->len;
/* then loop over the clients and update the positions */
max_buffer_usage = 0;
for (clients = sink->clients; clients; clients = next) {
GstTCPClient *client;
client = (GstTCPClient *) clients->data;
next = g_list_next (clients);
client->bufpos++;
GST_LOG_OBJECT (sink, "client %p with fd %d at position %d",
client, client->fd.fd, client->bufpos);
/* check soft max if needed, recover client */
if (sink->units_soft_max > 0 && client->bufpos >= sink->units_soft_max) {
gint newpos;
newpos = gst_multifdsink_recover_client (sink, client);
if (newpos != client->bufpos) {
client->bufpos = newpos;
client->discont = TRUE;
GST_WARNING_OBJECT (sink, "client %p with fd %d position reset to %d",
client, client->fd.fd, client->bufpos);
} else {
GST_WARNING_OBJECT (sink,
"client %p with fd %d not recovering position", client,
client->fd.fd);
}
}
/* check hard max and timeout, remove client */
if ((sink->units_max > 0 && client->bufpos >= sink->units_max) ||
(sink->timeout > 0
&& now - client->last_activity_time > sink->timeout)) {
/* remove client */
GST_WARNING_OBJECT (sink, "client %p with fd %d is too slow, removing",
client, client->fd.fd);
/* remove the client, the fd set will be cleared and the select thread will
* be signaled */
client->status = GST_CLIENT_STATUS_SLOW;
gst_multifdsink_remove_client_link (sink, clients);
/* set client to invalid position while being removed */
client->bufpos = -1;
need_signal = TRUE;
} else if (client->bufpos == 0) {
/* can send data to this client now. need to signal the select thread that
* the fd_set changed */
gst_fdset_fd_ctl_write (sink->fdset, &client->fd, TRUE);
need_signal = TRUE;
}
/* keep track of maximum buffer usage */
if (client->bufpos > max_buffer_usage) {
max_buffer_usage = client->bufpos;
}
}
/* nobody is referencing units after max_buffer_usage so we can
* remove them from the queue */
for (i = queuelen - 1; i > max_buffer_usage; i--) {
GstBuffer *old;
/* queue exceeded max size */
queuelen--;
old = g_array_index (sink->bufqueue, GstBuffer *, i);
sink->bufqueue = g_array_remove_index (sink->bufqueue, i);
/* unref tail buffer */
gst_buffer_unref (old);
}
sink->buffers_queued = max_buffer_usage;
g_mutex_unlock (sink->clientslock);
/* and send a signal to thread if fd_set changed */
if (need_signal) {
SEND_COMMAND (sink, CONTROL_RESTART);
}
}
/* Handle the clients. Basically does a blocking select for one
* of the client fds to become read or writable. We also have a
* filedescriptor to receive commands on that we need to check.
*
* After going out of the select call, we read and write to all
* clients that can do so. Badly behaving clients are put on a
* garbage list and removed.
*/
static void
gst_multifdsink_handle_clients (GstMultiFdSink * sink)
{
int result;
GList *clients, *next;
gboolean try_again;
GstMultiFdSinkClass *fclass;
fclass = GST_MULTIFDSINK_GET_CLASS (sink);
do {
gboolean stop = FALSE;
try_again = FALSE;
/* check for:
* - server socket input (ie, new client connections)
* - client socket input (ie, clients saying goodbye)
* - client socket output (ie, client reads) */
result = gst_fdset_wait (sink->fdset, -1);
/* < 0 is an error, 0 just means a timeout happened */
if (result < 0) {
GST_WARNING_OBJECT (sink, "wait failed: %s", g_strerror (errno));
if (errno == EBADF) {
/* ok, so one of the fds is invalid. We loop over them to find one
* that gives an error to the F_GETFL fcntl. */
g_mutex_lock (sink->clientslock);
for (clients = sink->clients; clients; clients = next) {
GstTCPClient *client;
int fd;
long flags;
int res;
client = (GstTCPClient *) clients->data;
next = g_list_next (clients);
fd = client->fd.fd;
res = fcntl (fd, F_GETFL, &flags);
if (res == -1) {
GST_WARNING_OBJECT (sink, "fnctl failed for %d, removing: %s",
fd, g_strerror (errno));
if (errno == EBADF) {
client->status = GST_CLIENT_STATUS_ERROR;
gst_multifdsink_remove_client_link (sink, clients);
}
}
}
g_mutex_unlock (sink->clientslock);
/* after this, go back in the select loop as the read/writefds
* are not valid */
try_again = TRUE;
} else if (errno == EINTR) {
/* interrupted system call, just redo the select */
try_again = TRUE;
} else {
GST_ELEMENT_ERROR (sink, RESOURCE, READ, (NULL),
("select failed: %s", g_strerror (errno)));
return;
}
} else {
GST_LOG_OBJECT (sink, "wait done: %d", result);
/* read all commands */
if (gst_fdset_fd_can_read (sink->fdset, &READ_SOCKET (sink))) {
GST_LOG_OBJECT (sink, "have a command");
while (TRUE) {
gchar command;
int res;
READ_COMMAND (sink, command, res);
if (res < 0) {
GST_LOG_OBJECT (sink, "no more commands");
/* no more commands */
break;
}
switch (command) {
case CONTROL_RESTART:
GST_LOG_OBJECT (sink, "restart");
/* need to restart the select call as the fd_set changed */
try_again = TRUE;
break;
/* need to restart the select call as the fd_set changed */
case CONTROL_STOP:
GST_LOG_OBJECT (sink, "stop");
/* stop this function */
stop = TRUE;
break;
default:
GST_WARNING_OBJECT (sink, "unkown");
g_warning ("multifdsink: unknown control message received");
break;
}
}
}
}
if (stop) {
return;
}
} while (try_again);
if (fclass->wait)
fclass->wait (sink, sink->fdset);
/* Check the reads */
g_mutex_lock (sink->clientslock);
for (clients = sink->clients; clients; clients = next) {
GstTCPClient *client;
client = (GstTCPClient *) clients->data;
next = g_list_next (clients);
if (client->status != GST_CLIENT_STATUS_OK) {
gst_multifdsink_remove_client_link (sink, clients);
continue;
}
if (gst_fdset_fd_has_closed (sink->fdset, &client->fd)) {
client->status = GST_CLIENT_STATUS_CLOSED;
gst_multifdsink_remove_client_link (sink, clients);
continue;
}
if (gst_fdset_fd_has_error (sink->fdset, &client->fd)) {
client->status = GST_CLIENT_STATUS_ERROR;
gst_multifdsink_remove_client_link (sink, clients);
continue;
}
if (gst_fdset_fd_can_read (sink->fdset, &client->fd)) {
/* handle client read */
if (!gst_multifdsink_handle_client_read (sink, client)) {
gst_multifdsink_remove_client_link (sink, clients);
continue;
}
}
if (gst_fdset_fd_can_write (sink->fdset, &client->fd)) {
/* handle client write */
if (!gst_multifdsink_handle_client_write (sink, client)) {
gst_multifdsink_remove_client_link (sink, clients);
continue;
}
}
}
g_mutex_unlock (sink->clientslock);
}
/* we handle the client communication in another thread so that we do not block
* the gstreamer thread while we select() on the client fds */
static gpointer
gst_multifdsink_thread (GstMultiFdSink * sink)
{
while (sink->running) {
gst_multifdsink_handle_clients (sink);
}
return NULL;
}
static void
gst_multifdsink_chain (GstPad * pad, GstData * _data)
{
GstBuffer *buf = GST_BUFFER (_data);
GstMultiFdSink *sink;
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (buf != NULL);
sink = GST_MULTIFDSINK (GST_OBJECT_PARENT (pad));
g_return_if_fail (GST_FLAG_IS_SET (sink, GST_MULTIFDSINK_OPEN));
if (GST_IS_EVENT (buf)) {
g_warning ("FIXME: handle events");
return;
}
/* if the incoming buffer is marked as IN CAPS, then we assume for now
* it's a streamheader that needs to be sent to each new client, so we
* put it on our internal list of streamheader buffers.
* After that we return, since we only send these out when we get
* non IN_CAPS buffers so we properly keep track of clients that got
* streamheaders. */
if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_IN_CAPS)) {
GST_DEBUG_OBJECT (sink,
"appending IN_CAPS buffer with length %d to streamheader",
GST_BUFFER_SIZE (buf));
sink->streamheader = g_slist_append (sink->streamheader, buf);
return;
}
/* queue the buffer */
gst_multifdsink_queue_buffer (sink, buf);
sink->bytes_to_serve += GST_BUFFER_SIZE (buf);
}
static void
gst_multifdsink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstMultiFdSink *multifdsink;
g_return_if_fail (GST_IS_MULTIFDSINK (object));
multifdsink = GST_MULTIFDSINK (object);
switch (prop_id) {
case ARG_PROTOCOL:
multifdsink->protocol = g_value_get_enum (value);
break;
case ARG_MODE:
multifdsink->mode = g_value_get_enum (value);
break;
case ARG_BUFFERS_MAX:
multifdsink->units_max = g_value_get_int (value);
break;
case ARG_BUFFERS_SOFT_MAX:
multifdsink->units_soft_max = g_value_get_int (value);
break;
case ARG_UNIT_TYPE:
multifdsink->unit_type = g_value_get_enum (value);
break;
case ARG_UNITS_MAX:
multifdsink->units_max = g_value_get_int (value);
break;
case ARG_UNITS_SOFT_MAX:
multifdsink->units_soft_max = g_value_get_int (value);
break;
case ARG_RECOVER_POLICY:
multifdsink->recover_policy = g_value_get_enum (value);
break;
case ARG_TIMEOUT:
multifdsink->timeout = g_value_get_uint64 (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_multifdsink_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstMultiFdSink *multifdsink;
g_return_if_fail (GST_IS_MULTIFDSINK (object));
multifdsink = GST_MULTIFDSINK (object);
switch (prop_id) {
case ARG_PROTOCOL:
g_value_set_enum (value, multifdsink->protocol);
break;
case ARG_MODE:
g_value_set_enum (value, multifdsink->mode);
break;
case ARG_BUFFERS_MAX:
g_value_set_int (value, multifdsink->units_max);
break;
case ARG_BUFFERS_SOFT_MAX:
g_value_set_int (value, multifdsink->units_soft_max);
break;
case ARG_BUFFERS_QUEUED:
g_value_set_uint (value, multifdsink->buffers_queued);
break;
case ARG_BYTES_QUEUED:
g_value_set_uint (value, multifdsink->bytes_queued);
break;
case ARG_TIME_QUEUED:
g_value_set_uint64 (value, multifdsink->time_queued);
break;
case ARG_UNIT_TYPE:
g_value_set_enum (value, multifdsink->unit_type);
break;
case ARG_UNITS_MAX:
g_value_set_int (value, multifdsink->units_max);
break;
case ARG_UNITS_SOFT_MAX:
g_value_set_int (value, multifdsink->units_soft_max);
break;
case ARG_RECOVER_POLICY:
g_value_set_enum (value, multifdsink->recover_policy);
break;
case ARG_TIMEOUT:
g_value_set_uint64 (value, multifdsink->timeout);
break;
case ARG_BYTES_TO_SERVE:
g_value_set_uint64 (value, multifdsink->bytes_to_serve);
break;
case ARG_BYTES_SERVED:
g_value_set_uint64 (value, multifdsink->bytes_served);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/* create a socket for sending to remote machine */
static gboolean
gst_multifdsink_init_send (GstMultiFdSink * this)
{
GstMultiFdSinkClass *fclass;
int control_socket[2];
fclass = GST_MULTIFDSINK_GET_CLASS (this);
GST_INFO_OBJECT (this, "starting in mode %d", this->mode);
this->fdset = gst_fdset_new (this->mode);
if (socketpair (PF_UNIX, SOCK_STREAM, 0, control_socket) < 0) {
GST_ELEMENT_ERROR (this, RESOURCE, OPEN_READ_WRITE, (NULL),
GST_ERROR_SYSTEM);
return FALSE;
}
READ_SOCKET (this).fd = control_socket[0];
WRITE_SOCKET (this).fd = control_socket[1];
gst_fdset_add_fd (this->fdset, &READ_SOCKET (this));
gst_fdset_fd_ctl_read (this->fdset, &READ_SOCKET (this), TRUE);
fcntl (READ_SOCKET (this).fd, F_SETFL, O_NONBLOCK);
fcntl (WRITE_SOCKET (this).fd, F_SETFL, O_NONBLOCK);
this->streamheader = NULL;
this->bytes_to_serve = 0;
this->bytes_served = 0;
if (fclass->init) {
fclass->init (this);
}
this->running = TRUE;
this->thread = g_thread_create ((GThreadFunc) gst_multifdsink_thread,
this, TRUE, NULL);
return TRUE;
}
static void
gst_multifdsink_close (GstMultiFdSink * this)
{
GstMultiFdSinkClass *fclass;
fclass = GST_MULTIFDSINK_GET_CLASS (this);
this->running = FALSE;
SEND_COMMAND (this, CONTROL_STOP);
g_thread_join (this->thread);
close (READ_SOCKET (this).fd);
close (WRITE_SOCKET (this).fd);
gst_fdset_remove_fd (this->fdset, &READ_SOCKET (this));
if (this->streamheader) {
GSList *l;
for (l = this->streamheader; l; l = l->next) {
gst_buffer_unref (l->data);
}
g_slist_free (this->streamheader);
}
if (fclass->close)
fclass->close (this);
gst_fdset_free (this->fdset);
}
static GstElementStateReturn
gst_multifdsink_change_state (GstElement * element)
{
GstMultiFdSink *sink;
g_return_val_if_fail (GST_IS_MULTIFDSINK (element), GST_STATE_FAILURE);
sink = GST_MULTIFDSINK (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
if (!GST_FLAG_IS_SET (element, GST_MULTIFDSINK_OPEN)) {
if (!gst_multifdsink_init_send (sink))
return GST_STATE_FAILURE;
GST_FLAG_SET (sink, GST_MULTIFDSINK_OPEN);
}
break;
case GST_STATE_READY_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_PLAYING:
break;
case GST_STATE_PLAYING_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_READY:
break;
case GST_STATE_READY_TO_NULL:
if (GST_FLAG_IS_SET (element, GST_MULTIFDSINK_OPEN)) {
gst_multifdsink_close (GST_MULTIFDSINK (element));
GST_FLAG_UNSET (sink, GST_MULTIFDSINK_OPEN);
}
break;
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}
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