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gstreamer/gst/tcp/gstmultifdsink.c
Thomas Vander Stichele 1ece1a9751 more commenting 
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more commenting
2006-05-11 12:34:53 +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>
* Copyright (C) 2006 Wim Taymans <wim at fluendo dot com>
*
* 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.
*/
/**
* SECTION:element-multifdsink
* @short_description: Send data to multiple file descriptors
* @see_also: tcpserversink
*
* <refsect2>
* <para>
* This plugin writes incoming data to a set of file descriptors. The
* file descriptors can be added to multifdsink by emiting the "add" signal. For
* each descriptor added, the "client-added" signal will be called.
* </para>
* <para>
* Clients can be removed from multifdsink by emiting the "remove" signal. For
* each descriptor removed, the "client-removed" signal will be called. The
* "client-removed" signal can also be fired when multifdsink decides that a
* client is not active anymore or, depending on the value of the
* "recover-policy," if the client is reading to slow.
* In all cases, multifdsink will never ever close a file descriptor itself.
* The user of multifdsink is responsible for closing the file descriptor.
* This can for example be done in response to the "client-fd-removed" signal.
* Note that multifdsink still has a reference to the file descriptor when the
* "client-removed" signal is emited so that "get-stats" can be performed on
* the descriptor; It is therefore not allowed to close the file descriptor in
* the "client-removed" signal, use the "client-fd-removed" signal to close the
* fd.
* </para>
* <para>
* Multifdsink internally keeps a queue of the incomming buffers and uses a
* separate thread to send the buffers to the clients. This ensures that no
* client write can block the pipeline and that clients can read with different
* speeds.
* </para>
* <para>
* When adding a client to multifdsink, the "sync-method" property will define
* which buffer will be sent first to the client. Clients can be sent
* respectively the most recent buffer (which might not be decodable by the
* client when it is not a keyframe), the next keyframe received in multifdsink
* (which can take some time depending on the keyframe rate, or the last
* received keyframe (which will cause a burst-on-connect).
* </para>
* <para>
* When streaming data, clients are allowed to read at a different rate than
* the rate at which multifdsink receives data. If the client is reading too
* fast, no data will be send to the client until multifdsink receives more
* data. If the client however reads too slow, data for that client will bunch
* up in multifdsink. Two properties control the amount of data (buffers) that
* is queued in multifdsink: "buffers-max" and "buffers-soft-max". A client
* with a lag of "buffers-max" is removed from multifdsink forcibly.
* </para>
* <para>
* A client with a lag of at least "buffers-soft-max" enters the recovery
* procedure which is controlled with the "recover-policy" property. A recover
* policy of NONE will do nothing, RESYNC_LATEST will send the most recently
* received buffer as the next buffer for the client, RESYNC_SOFT_LIMIT
* positions the client to the soft limit in the buffer queue and
* RESYNC_KEYFRAME positions the client to the most recent keyframe in the
* buffer queue.
* </para>
* <para>
* multifdsink will synchronize on the clock before serving the buffers to the
* clients.
* </para>
* </refsect2>
*
* Last reviewed on 2006-04-28 (0.10.7)
*/
#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>
#include <sys/stat.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 const GstElementDetails gst_multi_fd_sink_details =
GST_ELEMENT_DETAILS ("Multi filedescriptor sink",
"Sink/Network",
"Send data to multiple filedescriptors",
"Thomas Vander Stichele <thomas at apestaart dot org>, "
"Wim Taymans <wim@fluendo.com>");
static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
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,
SIGNAL_CLIENT_FD_REMOVED,
LAST_SIGNAL
};
/* this is really arbitrarily chosen */
#define DEFAULT_PROTOCOL GST_TCP_PROTOCOL_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
#define DEFAULT_SYNC_METHOD GST_SYNC_METHOD_LATEST
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_SYNC_METHOD,
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 const GEnumValue recover_policy[] = {
{GST_RECOVER_POLICY_NONE,
"Do not try to recover", "none"},
{GST_RECOVER_POLICY_RESYNC_LATEST,
"Resync client to latest buffer", "latest"},
{GST_RECOVER_POLICY_RESYNC_SOFT_LIMIT,
"Resync client to soft limit", "soft-limit"},
{GST_RECOVER_POLICY_RESYNC_KEYFRAME,
"Resync client to most recent keyframe", "keyframe"},
{0, NULL, NULL},
};
if (!recover_policy_type) {
recover_policy_type =
g_enum_register_static ("GstRecoverPolicy", recover_policy);
}
return recover_policy_type;
}
#define GST_TYPE_SYNC_METHOD (gst_sync_method_get_type())
static GType
gst_sync_method_get_type (void)
{
static GType sync_method_type = 0;
static const GEnumValue sync_method[] = {
{GST_SYNC_METHOD_LATEST,
"Serve starting from the latest buffer", "latest"},
{GST_SYNC_METHOD_NEXT_KEYFRAME,
"Serve starting from the next keyframe", "next-keyframe"},
{GST_SYNC_METHOD_LATEST_KEYFRAME,
"Serve everything since the latest keyframe (burst)",
"latest-keyframe"},
{0, NULL, NULL},
};
if (!sync_method_type) {
sync_method_type = g_enum_register_static ("GstSyncMethod", sync_method);
}
return sync_method_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 const GEnumValue unit_type[] = {
{GST_UNIT_TYPE_BUFFERS, "Buffers", "buffers"},
{GST_UNIT_TYPE_BYTES, "Bytes", "bytes"},
{GST_UNIT_TYPE_TIME, "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 const GEnumValue client_status[] = {
{GST_CLIENT_STATUS_OK, "ok", "ok"},
{GST_CLIENT_STATUS_CLOSED, "Closed", "closed"},
{GST_CLIENT_STATUS_REMOVED, "Removed", "removed"},
{GST_CLIENT_STATUS_SLOW, "Too slow", "slow"},
{GST_CLIENT_STATUS_ERROR, "Error", "error"},
{GST_CLIENT_STATUS_DUPLICATE, "Duplicate", "duplicate"},
{0, NULL, NULL},
};
if (!client_status_type) {
client_status_type =
g_enum_register_static ("GstClientStatus", client_status);
}
return client_status_type;
}
static void gst_multi_fd_sink_finalize (GObject * object);
static void gst_multi_fd_sink_remove_client_link (GstMultiFdSink * sink,
GList * link);
static GstFlowReturn gst_multi_fd_sink_render (GstBaseSink * bsink,
GstBuffer * buf);
static GstStateChangeReturn gst_multi_fd_sink_change_state (GstElement *
element, GstStateChange transition);
static void gst_multi_fd_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_multi_fd_sink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
GST_BOILERPLATE (GstMultiFdSink, gst_multi_fd_sink, GstBaseSink,
GST_TYPE_BASE_SINK);
static guint gst_multi_fd_sink_signals[LAST_SIGNAL] = { 0 };
static void
gst_multi_fd_sink_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sinktemplate));
gst_element_class_set_details (element_class, &gst_multi_fd_sink_details);
}
static void
gst_multi_fd_sink_class_init (GstMultiFdSinkClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstBaseSinkClass *gstbasesink_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstbasesink_class = (GstBaseSinkClass *) klass;
gobject_class->set_property = gst_multi_fd_sink_set_property;
gobject_class->get_property = gst_multi_fd_sink_get_property;
gobject_class->finalize = gst_multi_fd_sink_finalize;
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, 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_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_SYNC_METHOD,
g_param_spec_enum ("sync-method", "Sync Method",
"How to sync new clients to the stream",
GST_TYPE_SYNC_METHOD, DEFAULT_SYNC_METHOD, G_PARAM_READWRITE));
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));
/**
* GstMultiFdSink::add:
* @gstmultifdsink: the multifdsink element to emit this signal on
* @fd: the file descriptor to add to multifdsink
*
* Hand the given open file descriptor to multifdsink to write to.
*/
gst_multi_fd_sink_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);
/**
* GstMultiFdSink::remove:
* @gstmultifdsink: the multifdsink element to emit this signal on
* @fd: the file descriptor to remove from multifdsink
*
* Remove the given open file descriptor from multifdsink.
*/
gst_multi_fd_sink_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);
/**
* GstMultiFdSink::clear:
* @gstmultifdsink: the multifdsink element to emit this signal on
*
* Remove all file descriptors from multifdsink. Since multifdsink did not
* open fd's itself, it does not explicitly close the fd. The application
* should do so by connecting to the client-removed callback.
*/
gst_multi_fd_sink_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);
/**
* GstMultiFdSink::get-stats:
* @gstmultifdsink: the multifdsink element to emit this signal on
* @fd: the file descriptor to get stats of from multifdsink
*
* Get statistics about @fd. This function returns a GValueArray to ease
* automatic wrapping for bindings.
*
* Returns: a GValueArray with the statistics. The array contains 5 guint64
* values that represent respectively total number of bytes sent, time
* when the client was added, time when the client was disconnected/removed,
* time the client is/was active, last activity time. All times are
* expressed in nanoseconds (GstClockTime).
*/
gst_multi_fd_sink_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);
/**
* GstMultiFdSink::client-added:
* @gstmultifdsink: the multifdsink element that emitted this signal
* @fd: the file descriptor that was added to multifdsink
*
* The given file descriptor was added to multifdsink. This signal will
* be emited from the streaming thread so application should be prepared
* for that.
*/
gst_multi_fd_sink_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);
/**
* GstMultiFdSink::client-removed:
* @gstmultifdsink: the multifdsink element that emitted this signal
* @fd: the file descriptor that is to be removed from multifdsink
* @status: the reason why the client was removed
*
* The given file descriptor is about to be removed from multifdsink. This
* signal will be emited from the streaming thread so applications should
* be prepared for that.
*
* @gstmultifdsink still holds a handle to @fd so it is possible to call
* the get-stats signal from this callback. For the same reason it is
* not safe to close() and reuse @fd in this callback.
*/
gst_multi_fd_sink_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);
/**
* GstMultiFdSink::client-fd-removed:
* @gstmultifdsink: the multifdsink element that emitted this signal
* @fd: the file descriptor that was removed from multifdsink
*
* The given file descriptor was removed from multifdsink. This signal will
* be emited from the streaming thread so applications should be prepared
* for that.
*
* In this callback, @gstmultifdsink has removed all the information
* associated with @fd and it is therefore not possible to call get-stats
* with @fd. It is however safe to close() and reuse @fd in the callback.
*
* Since: 0.10.7
*/
gst_multi_fd_sink_signals[SIGNAL_CLIENT_FD_REMOVED] =
g_signal_new ("client-fd-removed", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstMultiFdSinkClass,
client_fd_removed), NULL, NULL, gst_tcp_marshal_VOID__INT,
G_TYPE_NONE, 1, G_TYPE_INT);
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_multi_fd_sink_change_state);
gstbasesink_class->render = GST_DEBUG_FUNCPTR (gst_multi_fd_sink_render);
klass->add = GST_DEBUG_FUNCPTR (gst_multi_fd_sink_add);
klass->remove = GST_DEBUG_FUNCPTR (gst_multi_fd_sink_remove);
klass->clear = GST_DEBUG_FUNCPTR (gst_multi_fd_sink_clear);
klass->get_stats = GST_DEBUG_FUNCPTR (gst_multi_fd_sink_get_stats);
GST_DEBUG_CATEGORY_INIT (multifdsink_debug, "multifdsink", 0, "FD sink");
}
static void
gst_multi_fd_sink_init (GstMultiFdSink * this, GstMultiFdSinkClass * klass)
{
GST_OBJECT_FLAG_UNSET (this, GST_MULTI_FD_SINK_OPEN);
this->protocol = DEFAULT_PROTOCOL;
this->mode = DEFAULT_MODE;
CLIENTS_LOCK_INIT (this);
this->clients = NULL;
this->fd_hash = g_hash_table_new (g_int_hash, g_int_equal);
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;
this->sync_method = DEFAULT_SYNC_METHOD;
}
static void
gst_multi_fd_sink_finalize (GObject * object)
{
GstMultiFdSink *this;
this = GST_MULTI_FD_SINK (object);
CLIENTS_LOCK_FREE (this);
g_hash_table_destroy (this->fd_hash);
g_array_free (this->bufqueue, TRUE);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
/* "add" signal implemntation */
void
gst_multi_fd_sink_add (GstMultiFdSink * sink, int fd)
{
GstTCPClient *client;
GList *clink;
GTimeVal now;
gint flags, res;
struct stat statbuf;
GST_DEBUG_OBJECT (sink, "[fd %5d] adding client", 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;
client->new_connection = TRUE;
/* 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);
CLIENTS_LOCK (sink);
/* check the hash to find a duplicate fd */
clink = g_hash_table_lookup (sink->fd_hash, &client->fd.fd);
if (clink != NULL) {
client->status = GST_CLIENT_STATUS_DUPLICATE;
CLIENTS_UNLOCK (sink);
GST_WARNING_OBJECT (sink, "[fd %5d] duplicate client found, refusing", fd);
g_signal_emit (G_OBJECT (sink),
gst_multi_fd_sink_signals[SIGNAL_CLIENT_REMOVED], 0, fd,
client->status);
g_free (client);
return;
}
/* we can add the fd now */
clink = sink->clients = g_list_prepend (sink->clients, client);
g_hash_table_insert (sink->fd_hash, &client->fd.fd, clink);
/* set the socket to non blocking */
res = fcntl (fd, F_SETFL, O_NONBLOCK);
/* we always read from a client */
gst_fdset_add_fd (sink->fdset, &client->fd);
/* we don't try to read from write only fds */
flags = fcntl (fd, F_GETFL, 0);
if ((flags & O_ACCMODE) != O_WRONLY) {
gst_fdset_fd_ctl_read (sink->fdset, &client->fd, TRUE);
}
/* figure out the mode, can't use send() for non sockets */
res = fstat (fd, &statbuf);
if (S_ISSOCK (statbuf.st_mode)) {
client->is_socket = TRUE;
}
SEND_COMMAND (sink, CONTROL_RESTART);
CLIENTS_UNLOCK (sink);
g_signal_emit (G_OBJECT (sink),
gst_multi_fd_sink_signals[SIGNAL_CLIENT_ADDED], 0, fd);
}
/* "remove" signal implemntation */
void
gst_multi_fd_sink_remove (GstMultiFdSink * sink, int fd)
{
GList *clink;
GST_DEBUG_OBJECT (sink, "[fd %5d] removing client", fd);
CLIENTS_LOCK (sink);
clink = g_hash_table_lookup (sink->fd_hash, &fd);
if (clink != NULL) {
GstTCPClient *client = (GstTCPClient *) clink->data;
client->status = GST_CLIENT_STATUS_REMOVED;
gst_multi_fd_sink_remove_client_link (sink, clink);
SEND_COMMAND (sink, CONTROL_RESTART);
} else {
GST_WARNING_OBJECT (sink, "[fd %5d] no client with this fd found!", fd);
}
CLIENTS_UNLOCK (sink);
}
/* can be called both through the signal (ie from any thread) or when stopping,
* after the writing thread has shut down */
void
gst_multi_fd_sink_clear (GstMultiFdSink * sink)
{
GList *clients, *next;
GST_DEBUG_OBJECT (sink, "clearing all clients");
CLIENTS_LOCK (sink);
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_multi_fd_sink_remove_client_link (sink, clients);
}
SEND_COMMAND (sink, CONTROL_RESTART);
CLIENTS_UNLOCK (sink);
}
/* "get-stats" signal implemntation
* the array returned contains:
*
* guint64 : bytes_sent
* guint64 : connect time (in nanoseconds)
* guint64 : disconnect time (in nanoseconds)
* guint64 : time the client is/was connected (in nanoseconds)
* guint64 : last activity time (in nanoseconds)
*/
GValueArray *
gst_multi_fd_sink_get_stats (GstMultiFdSink * sink, int fd)
{
GstTCPClient *client;
GValueArray *result = NULL;
GList *clink;
CLIENTS_LOCK (sink);
clink = g_hash_table_lookup (sink->fd_hash, &fd);
client = (GstTCPClient *) clink->data;
if (client != NULL) {
GValue value = { 0 };
guint64 interval;
result = g_value_array_new (5);
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);
}
CLIENTS_UNLOCK (sink);
/* python doesn't like a NULL pointer yet */
if (result == NULL) {
GST_WARNING_OBJECT (sink, "[fd %5d] no client with this found!", fd);
result = g_value_array_new (0);
}
return result;
}
/* should be called with the clientslock held.
* Note that we don't close the fd as we didn't open it in the first
* place. An application should connect to the client-removed signal and
* close the fd itself.
*/
static void
gst_multi_fd_sink_remove_client_link (GstMultiFdSink * sink, GList * link)
{
int fd;
GTimeVal now;
GstTCPClient *client = (GstTCPClient *) link->data;
GstMultiFdSinkClass *fclass;
fclass = GST_MULTI_FD_SINK_GET_CLASS (sink);
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, "[fd %5d] removing client %p for no reason",
fd, client);
break;
case GST_CLIENT_STATUS_CLOSED:
GST_DEBUG_OBJECT (sink, "[fd %5d] removing client %p because of close",
fd, client);
break;
case GST_CLIENT_STATUS_REMOVED:
GST_DEBUG_OBJECT (sink,
"[fd %5d] removing client %p because the app removed it", fd, client);
break;
case GST_CLIENT_STATUS_SLOW:
GST_INFO_OBJECT (sink,
"[fd %5d] removing client %p because it was too slow", fd, client);
break;
case GST_CLIENT_STATUS_ERROR:
GST_WARNING_OBJECT (sink,
"[fd %5d] removing client %p because of error", fd, client);
break;
default:
GST_WARNING_OBJECT (sink,
"[fd %5d] removing client %p with invalid reason", fd, client);
break;
}
gst_fdset_remove_fd (sink->fdset, &client->fd);
g_get_current_time (&now);
client->disconnect_time = GST_TIMEVAL_TO_TIME (now);
/* free client buffers */
g_slist_foreach (client->sending, (GFunc) gst_mini_object_unref, NULL);
g_slist_free (client->sending);
client->sending = NULL;
/* unlock the mutex before signaling because the signal handler
* might query some properties */
CLIENTS_UNLOCK (sink);
g_signal_emit (G_OBJECT (sink),
gst_multi_fd_sink_signals[SIGNAL_CLIENT_REMOVED], 0, fd, client->status);
/* lock again before we remove the client completely */
CLIENTS_LOCK (sink);
/* fd cannot be reused in the above signal callback so we can safely
* remove it from the hashtable here */
if (!g_hash_table_remove (sink->fd_hash, &client->fd.fd)) {
GST_WARNING_OBJECT (sink,
"[fd %5d] error removing client %p from hash", client->fd.fd, client);
}
/* after releasing the lock above, the link could be invalid, more
* precisely, the next and prev pointers could point to invalid list
* links. One optimisation could be to add a cookie to the linked list
* and take a shortcut when it did not change between unlocking and locking
* our mutex. For now we just walk the list again. */
sink->clients = g_list_remove (sink->clients, client);
if (fclass->removed)
fclass->removed (sink, client->fd.fd);
g_free (client);
CLIENTS_UNLOCK (sink);
/* and the fd is really gone now */
g_signal_emit (G_OBJECT (sink),
gst_multi_fd_sink_signals[SIGNAL_CLIENT_FD_REMOVED], 0, fd);
CLIENTS_LOCK (sink);
}
/* 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_multi_fd_sink_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, "[fd %5d] ioctl failed: %s (%d)",
fd, g_strerror (errno), errno);
client->status = GST_CLIENT_STATUS_ERROR;
ret = FALSE;
return ret;
}
GST_DEBUG_OBJECT (sink, "[fd %5d] select reports client read of %d bytes",
fd, avail);
ret = TRUE;
if (avail == 0) {
/* client sent close, so remove it */
GST_DEBUG_OBJECT (sink, "[fd %5d] client asked for close, removing", fd);
client->status = GST_CLIENT_STATUS_CLOSED;
ret = FALSE;
} else if (avail < 0) {
GST_WARNING_OBJECT (sink, "[fd %5d] avail < 0, removing", 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, "[fd %5d] client wants us to read %d bytes",
fd, to_read);
nread = read (fd, dummy, to_read);
if (nread < -1) {
GST_WARNING_OBJECT (sink, "[fd %5d] could not read %d bytes: %s (%d)",
fd, to_read, g_strerror (errno), errno);
client->status = GST_CLIENT_STATUS_ERROR;
ret = FALSE;
break;
} else if (nread == 0) {
GST_WARNING_OBJECT (sink, "[fd %5d] 0 bytes in read, removing", fd);
client->status = GST_CLIENT_STATUS_ERROR;
ret = FALSE;
break;
}
avail -= nread;
}
while (avail > 0);
}
return ret;
}
/* Queue raw data for this client, creating a new buffer.
* This takes ownership of the data by
* setting it as GST_BUFFER_MALLOCDATA() on the created buffer
*/
static gboolean
gst_multi_fd_sink_client_queue_data (GstMultiFdSink * sink,
GstTCPClient * client, gchar * data, gint len)
{
GstBuffer *buf;
buf = gst_buffer_new ();
GST_BUFFER_DATA (buf) = (guint8 *) data;
GST_BUFFER_MALLOCDATA (buf) = (guint8 *) data;
GST_BUFFER_SIZE (buf) = len;
GST_LOG_OBJECT (sink, "[fd %5d] queueing data of length %d",
client->fd.fd, len);
client->sending = g_slist_append (client->sending, buf);
return TRUE;
}
/* GDP-encode given caps and queue them for sending */
static gboolean
gst_multi_fd_sink_client_queue_caps (GstMultiFdSink * sink,
GstTCPClient * client, const GstCaps * caps)
{
guint8 *header;
guint8 *payload;
guint length;
gchar *string;
g_return_val_if_fail (caps != NULL, FALSE);
string = gst_caps_to_string (caps);
GST_DEBUG_OBJECT (sink, "[fd %5d] Queueing caps %s through GDP",
client->fd.fd, string);
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_multi_fd_sink_client_queue_data (sink, client, (gchar *) header, length);
length = gst_dp_header_payload_length (header);
gst_multi_fd_sink_client_queue_data (sink, client, (gchar *) payload, length);
return TRUE;
}
static gboolean
is_sync_frame (GstMultiFdSink * sink, GstBuffer * buffer)
{
if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT)) {
return FALSE;
} else if (!GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_IN_CAPS)) {
return TRUE;
}
return FALSE;
}
/* queue the given buffer for the given client, possibly adding the GDP
* header if GDP is being used */
static gboolean
gst_multi_fd_sink_client_queue_buffer (GstMultiFdSink * sink,
GstTCPClient * client, GstBuffer * buffer)
{
if (sink->protocol == GST_TCP_PROTOCOL_GDP) {
guint8 *header;
guint len;
if (!gst_dp_header_from_buffer (buffer, 0, &len, &header)) {
GST_DEBUG_OBJECT (sink,
"[fd %5d] could not create header, removing client", client->fd.fd);
return FALSE;
}
gst_multi_fd_sink_client_queue_data (sink, client, (gchar *) header, len);
}
GST_LOG_OBJECT (sink, "[fd %5d] queueing buffer of length %d",
client->fd.fd, GST_BUFFER_SIZE (buffer));
gst_buffer_ref (buffer);
client->sending = g_slist_append (client->sending, buffer);
return TRUE;
}
/* decide where in the current buffer queue this new client should start
* receiving buffers from
* If this returns -1, it means that we haven't found a good point to
* start streaming from yet, and this function should be called again later
* when more buffers have arrived */
static gint
gst_multi_fd_sink_new_client (GstMultiFdSink * sink, GstTCPClient * client)
{
gint result;
switch (sink->sync_method) {
case GST_SYNC_METHOD_NEXT_KEYFRAME:
{
/* if the buffer at the head of the queue is a sync point we can proceed,
* else we need to skip the buffer and wait for a new one */
GST_LOG_OBJECT (sink,
"[fd %5d] new client, bufpos %d, waiting for keyframe", client->fd.fd,
client->bufpos);
/* the client is not yet aligned to a buffer */
if (client->bufpos < 0) {
result = -1;
} else {
GstBuffer *buf;
gint i;
for (i = client->bufpos; i >= 0; i--) {
/* get the buffer for the client */
buf = g_array_index (sink->bufqueue, GstBuffer *, i);
if (is_sync_frame (sink, buf)) {
GST_LOG_OBJECT (sink, "[fd %5d] new client, found sync",
client->fd.fd);
result = i;
goto done;
} else {
/* client is not on a buffer, need to skip this buffer and
* wait some more */
GST_LOG_OBJECT (sink, "[fd %5d] new client, skipping buffer",
client->fd.fd);
client->bufpos--;
}
}
result = -1;
}
break;
}
case GST_SYNC_METHOD_LATEST_KEYFRAME:
{
/* FIXME for new clients we constantly scan the complete
* buffer queue for sync point whenever a buffer is added. This is
* suboptimal because if we cannot find a sync point the first time,
* the algorithm should behave as GST_SYNC_METHOD_NEXT_KEYFRAME */
gint i, len;
GST_LOG_OBJECT (sink, "[fd %5d] new client, bufpos %d, bursting keyframe",
client->fd.fd, client->bufpos);
/* take length of queued buffers */
len = sink->bufqueue->len;
/* assume we don't find a keyframe */
result = -1;
/* then loop over all buffers to find the first keyframe */
for (i = 0; i < len; i++) {
GstBuffer *buf;
buf = g_array_index (sink->bufqueue, GstBuffer *, i);
if (is_sync_frame (sink, buf)) {
/* found a keyframe, return its position */
GST_LOG_OBJECT (sink, "found keyframe at %d", i);
result = i;
goto done;
}
}
GST_LOG_OBJECT (sink, "no keyframe found");
/* throw client to the waiting state */
client->bufpos = -1;
break;
}
default:
/* no syncing, we are happy with whatever the client is going to get */
GST_LOG_OBJECT (sink, "no client syn needed");
result = client->bufpos;
break;
}
done:
return result;
}
/* Handle a write on a client,
* which indicates a read request from a client.
*
* 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 focus only 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_multi_fd_sink_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_GDP) {
if (!client->caps_sent) {
GstPad *peer;
GstCaps *caps;
peer = gst_pad_get_peer (GST_BASE_SINK_PAD (sink));
if (!peer) {
GST_WARNING_OBJECT (sink, "pad has no peer");
return FALSE;
}
gst_object_unref (peer);
caps = gst_pad_get_negotiated_caps (GST_BASE_SINK_PAD (sink));
if (!caps) {
GST_WARNING_OBJECT (sink, "pad caps not yet negotiated");
return FALSE;
}
/* queue caps for sending */
res = gst_multi_fd_sink_client_queue_caps (sink, client, caps);
gst_caps_unref (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) {
GST_DEBUG_OBJECT (sink, "[fd %5d] Sending streamheader, %d buffers", fd,
g_slist_length (sink->streamheader));
if (sink->streamheader) {
GSList *l;
for (l = sink->streamheader; l; l = l->next) {
/* queue stream headers for sending */
res =
gst_multi_fd_sink_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;
/* for new connections, we need to find a good spot in the
* bufqueue to start streaming from */
if (client->new_connection) {
gint position = gst_multi_fd_sink_new_client (sink, client);
if (position >= 0) {
/* we got a valid spot in the queue */
client->new_connection = FALSE;
client->bufpos = position;
} else {
/* cannot send data to this client yet */
gst_fdset_fd_ctl_write (sink->fdset, &client->fd, FALSE);
return TRUE;
}
}
/* grab buffer */
buf = g_array_index (sink->bufqueue, GstBuffer *, client->bufpos);
client->bufpos--;
GST_LOG_OBJECT (sink, "[fd %5d] client %p at position %d",
fd, client, client->bufpos);
/* queueing a buffer will ref it */
gst_multi_fd_sink_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
if (client->is_socket) {
wrote =
send (fd, GST_BUFFER_DATA (head) + client->bufoffset, maxsize,
FLAGS);
} else {
wrote = write (fd, GST_BUFFER_DATA (head) + client->bufoffset, maxsize);
}
if (wrote < 0) {
/* hmm error.. */
if (errno == EAGAIN) {
/* nothing serious, resource was unavailable, try again later */
more = FALSE;
} else if (errno == ECONNRESET) {
GST_DEBUG_OBJECT (sink, "[fd %5d] connection reset by peer, removing",
fd);
client->status = GST_CLIENT_STATUS_CLOSED;
return FALSE;
} else {
GST_WARNING_OBJECT (sink,
"[fd %5d] could not write, removing client: %s (%d)", fd,
g_strerror (errno), errno);
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_multi_fd_sink_recover_client (GstMultiFdSink * sink, GstTCPClient * client)
{
gint newbufpos;
GST_WARNING_OBJECT (sink,
"[fd %5d] client %p is lagging at %d, recover using policy %d",
client->fd.fd, client, 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_LATEST:
/* move to beginning of queue */
newbufpos = -1;
break;
case GST_RECOVER_POLICY_RESYNC_SOFT_LIMIT:
/* move to beginning of soft max */
newbufpos = sink->units_soft_max;
break;
case GST_RECOVER_POLICY_RESYNC_KEYFRAME:
/* find keyframe in buffers, we search backwards to find the
* closest keyframe relative to what this client already received. */
newbufpos = MIN (sink->bufqueue->len - 1, sink->units_soft_max - 1);
while (newbufpos >= 0) {
GstBuffer *buf;
buf = g_array_index (sink->bufqueue, GstBuffer *, newbufpos);
if (is_sync_frame (sink, buf)) {
/* found a buffer that is not a delta unit */
break;
}
newbufpos--;
}
break;
default:
/* unknown recovery procedure */
newbufpos = sink->units_soft_max;
break;
}
return newbufpos;
}
/* Queue a buffer on the global queue.
*
* This function adds the buffer to the front of a GArray. It removes the
* tail buffer if the max queue size is exceeded, unreffing the queued buffer.
* 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 over 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_multi_fd_sink_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);
CLIENTS_LOCK (sink);
/* 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, "[fd %5d] client %p at position %d",
client->fd.fd, client, 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_multi_fd_sink_recover_client (sink, client);
if (newpos != client->bufpos) {
client->bufpos = newpos;
client->discont = TRUE;
GST_INFO_OBJECT (sink, "[fd %5d] client %p position reset to %d",
client->fd.fd, client, client->bufpos);
} else {
GST_INFO_OBJECT (sink,
"[fd %5d] client %p not recovering position",
client->fd.fd, client);
}
}
/* 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, "[fd %5d] client %p is too slow, removing",
client->fd.fd, client);
/* remove the client, the fd set will be cleared and the select thread
* will be signaled */
client->status = GST_CLIENT_STATUS_SLOW;
gst_multi_fd_sink_remove_client_link (sink, clients);
/* set client to invalid position while being removed */
client->bufpos = -1;
need_signal = TRUE;
} else if (client->bufpos == 0 || client->new_connection) {
/* 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;
}
}
/* now look for sync points and make sure there is at least one
* sync point in the queue. We only do this if the burst mode
* is enabled. */
if (sink->sync_method == GST_SYNC_METHOD_LATEST_KEYFRAME) {
/* no point in searching beyond the queue length */
gint limit = queuelen;
GstBuffer *buf;
/* no point in searching beyond the soft-max if any. */
if (sink->units_soft_max > 0) {
limit = MIN (limit, sink->units_soft_max);
}
GST_LOG_OBJECT (sink, "extending queue to include sync point, now at %d",
max_buffer_usage);
for (i = 0; i < limit; i++) {
buf = g_array_index (sink->bufqueue, GstBuffer *, i);
if (is_sync_frame (sink, buf)) {
/* found a sync frame, now extend the buffer usage to
* include at least this frame. */
max_buffer_usage = MAX (max_buffer_usage, i);
break;
}
}
GST_LOG_OBJECT (sink, "max buffer usage is now %d", max_buffer_usage);
}
/* nobody is referencing units after max_buffer_usage so we can
* remove them from the queue. We remove them in reverse order as
* this is the most optimal for GArray. */
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);
}
/* save for stats */
sink->buffers_queued = max_buffer_usage;
CLIENTS_UNLOCK (sink);
/* 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_multi_fd_sink_handle_clients (GstMultiFdSink * sink)
{
int result;
GList *clients, *next;
gboolean try_again;
GstMultiFdSinkClass *fclass;
fclass = GST_MULTI_FD_SINK_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) */
GST_LOG_OBJECT (sink, "waiting on action on fdset");
result = gst_fdset_wait (sink->fdset, -1);
/* < 0 is an error, 0 just means a timeout happened, which is impossible */
if (result < 0) {
GST_WARNING_OBJECT (sink, "wait failed: %s (%d)", g_strerror (errno),
errno);
if (errno == EBADF) {
/* ok, so one or more of the fds is invalid. We loop over them to find
* the ones that give an error to the F_GETFL fcntl. */
CLIENTS_LOCK (sink);
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 (%d)",
fd, g_strerror (errno), errno);
if (errno == EBADF) {
client->status = GST_CLIENT_STATUS_ERROR;
gst_multi_fd_sink_remove_client_link (sink, clients);
}
}
}
CLIENTS_UNLOCK (sink);
/* 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 {
/* this is quite bad... */
GST_ELEMENT_ERROR (sink, RESOURCE, READ, (NULL),
("select failed: %s (%d)", g_strerror (errno), errno));
return;
}
} else {
GST_LOG_OBJECT (sink, "wait done: %d sockets with events", 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 */
/* if other file descriptors than the READ_SOCKET had activity,
* we don't restart just yet, but handle the other clients first
*/
if (result == 1)
try_again = TRUE;
break;
case CONTROL_STOP:
/* break out of the select loop */
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);
/* subclasses can check fdset with this virtual function */
if (fclass->wait)
fclass->wait (sink, sink->fdset);
/* Check the clients */
CLIENTS_LOCK (sink);
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_multi_fd_sink_remove_client_link (sink, clients);
continue;
}
if (gst_fdset_fd_has_closed (sink->fdset, &client->fd)) {
client->status = GST_CLIENT_STATUS_CLOSED;
gst_multi_fd_sink_remove_client_link (sink, clients);
continue;
}
if (gst_fdset_fd_has_error (sink->fdset, &client->fd)) {
GST_WARNING_OBJECT (sink, "gst_fdset_fd_has_error for %d", client->fd);
client->status = GST_CLIENT_STATUS_ERROR;
gst_multi_fd_sink_remove_client_link (sink, clients);
continue;
}
if (gst_fdset_fd_can_read (sink->fdset, &client->fd)) {
/* handle client read */
if (!gst_multi_fd_sink_handle_client_read (sink, client)) {
gst_multi_fd_sink_remove_client_link (sink, clients);
continue;
}
}
if (gst_fdset_fd_can_write (sink->fdset, &client->fd)) {
/* handle client write */
if (!gst_multi_fd_sink_handle_client_write (sink, client)) {
gst_multi_fd_sink_remove_client_link (sink, clients);
continue;
}
}
}
CLIENTS_UNLOCK (sink);
}
/* 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_multi_fd_sink_thread (GstMultiFdSink * sink)
{
while (sink->running) {
gst_multi_fd_sink_handle_clients (sink);
}
return NULL;
}
static GstFlowReturn
gst_multi_fd_sink_render (GstBaseSink * bsink, GstBuffer * buf)
{
GstMultiFdSink *sink;
sink = GST_MULTI_FD_SINK (bsink);
/* since we keep this buffer out of the scope of this method */
gst_buffer_ref (buf);
g_return_val_if_fail (GST_OBJECT_FLAG_IS_SET (sink, GST_MULTI_FD_SINK_OPEN),
GST_FLOW_ERROR);
GST_LOG_OBJECT (sink, "received buffer %p", buf);
/* if we get IN_CAPS buffers, but the previous buffer was not IN_CAPS,
* it means we're getting new streamheader buffers, and we should clear
* the old ones */
if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_IN_CAPS) &&
sink->previous_buffer_in_caps == FALSE) {
GST_DEBUG_OBJECT (sink,
"receiving new IN_CAPS buffers, clearing old streamheader");
g_slist_foreach (sink->streamheader, (GFunc) gst_mini_object_unref, NULL);
g_slist_free (sink->streamheader);
sink->streamheader = NULL;
}
/* 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_FLAG_IN_CAPS)) {
sink->previous_buffer_in_caps = TRUE;
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 GST_FLOW_OK;
}
sink->previous_buffer_in_caps = FALSE;
/* queue the buffer */
gst_multi_fd_sink_queue_buffer (sink, buf);
sink->bytes_to_serve += GST_BUFFER_SIZE (buf);
return GST_FLOW_OK;
}
static void
gst_multi_fd_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstMultiFdSink *multifdsink;
g_return_if_fail (GST_IS_MULTI_FD_SINK (object));
multifdsink = GST_MULTI_FD_SINK (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;
case ARG_SYNC_METHOD:
multifdsink->sync_method = g_value_get_enum (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_multi_fd_sink_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstMultiFdSink *multifdsink;
g_return_if_fail (GST_IS_MULTI_FD_SINK (object));
multifdsink = GST_MULTI_FD_SINK (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_SYNC_METHOD:
g_value_set_enum (value, multifdsink->sync_method);
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_multi_fd_sink_start (GstBaseSink * bsink)
{
GstMultiFdSinkClass *fclass;
int control_socket[2];
GstMultiFdSink *this;
if (GST_OBJECT_FLAG_IS_SET (bsink, GST_MULTI_FD_SINK_OPEN))
return TRUE;
this = GST_MULTI_FD_SINK (bsink);
fclass = GST_MULTI_FD_SINK_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)
goto socket_pair;
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_multi_fd_sink_thread,
this, TRUE, NULL);
GST_OBJECT_FLAG_SET (this, GST_MULTI_FD_SINK_OPEN);
return TRUE;
/* ERRORS */
socket_pair:
{
GST_ELEMENT_ERROR (this, RESOURCE, OPEN_READ_WRITE, (NULL),
GST_ERROR_SYSTEM);
return FALSE;
}
}
static gboolean
multifdsink_hash_remove (gpointer key, gpointer value, gpointer data)
{
return TRUE;
}
static gboolean
gst_multi_fd_sink_stop (GstBaseSink * bsink)
{
GstMultiFdSinkClass *fclass;
GstMultiFdSink *this;
GstBuffer *buf;
int i;
this = GST_MULTI_FD_SINK (bsink);
fclass = GST_MULTI_FD_SINK_GET_CLASS (this);
if (!GST_OBJECT_FLAG_IS_SET (bsink, GST_MULTI_FD_SINK_OPEN))
return TRUE;
this->running = FALSE;
SEND_COMMAND (this, CONTROL_STOP);
if (this->thread) {
GST_DEBUG_OBJECT (this, "joining thread");
g_thread_join (this->thread);
GST_DEBUG_OBJECT (this, "joined thread");
this->thread = NULL;
}
/* free the clients */
gst_multi_fd_sink_clear (this);
close (READ_SOCKET (this).fd);
close (WRITE_SOCKET (this).fd);
if (this->streamheader) {
g_slist_foreach (this->streamheader, (GFunc) gst_mini_object_unref, NULL);
g_slist_free (this->streamheader);
this->streamheader = NULL;
}
if (fclass->close)
fclass->close (this);
if (this->fdset) {
gst_fdset_remove_fd (this->fdset, &READ_SOCKET (this));
gst_fdset_free (this->fdset);
this->fdset = NULL;
}
g_hash_table_foreach_remove (this->fd_hash, multifdsink_hash_remove, this);
/* remove all queued buffers */
if (this->bufqueue) {
GST_DEBUG_OBJECT (this, "Emptying bufqueue with %d buffers",
this->bufqueue->len);
for (i = this->bufqueue->len - 1; i >= 0; --i) {
buf = g_array_index (this->bufqueue, GstBuffer *, i);
GST_LOG_OBJECT (this, "Removing buffer %p (%d) with refcount %d", buf, i,
GST_MINI_OBJECT_REFCOUNT (buf));
gst_buffer_unref (buf);
this->bufqueue = g_array_remove_index (this->bufqueue, i);
}
/* freeing the array is done in _finalize */
}
GST_OBJECT_FLAG_UNSET (this, GST_MULTI_FD_SINK_OPEN);
return TRUE;
}
static GstStateChangeReturn
gst_multi_fd_sink_change_state (GstElement * element, GstStateChange transition)
{
GstMultiFdSink *sink;
GstStateChangeReturn ret;
sink = GST_MULTI_FD_SINK (element);
/* we disallow changing the state from the streaming thread */
if (g_thread_self () == sink->thread)
return GST_STATE_CHANGE_FAILURE;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
if (!gst_multi_fd_sink_start (GST_BASE_SINK (sink)))
goto start_failed;
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_NULL:
gst_multi_fd_sink_stop (GST_BASE_SINK (sink));
break;
default:
break;
}
return ret;
/* ERRORS */
start_failed:
{
return GST_STATE_CHANGE_FAILURE;
}
}
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