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gstreamer/gst/tcp/gstmultifdsink.c
Thomas Vander Stichele 14ac8bb585 multihandlesink: rework to use GST_TYPE_FORMAT
2012-02-12 22:23:44 +01:00

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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
* @see_also: tcpserversink
*
* This plugin writes incoming data to a set of file descriptors. The
* file descriptors can be added to multifdsink by emitting the #GstMultiFdSink::add signal.
* For each descriptor added, the #GstMultiFdSink::client-added signal will be called.
*
* As of version 0.10.8, a client can also be added with the #GstMultiFdSink::add-full signal
* that allows for more control over what and how much data a client
* initially receives.
*
* Clients can be removed from multifdsink by emitting the #GstMultiFdSink::remove signal. For
* each descriptor removed, the #GstMultiFdSink::client-removed signal will be called. The
* #GstMultiFdSink::client-removed signal can also be fired when multifdsink decides that a
* client is not active anymore or, depending on the value of the
* #GstMultiFdSink:recover-policy property, if the client is reading too slowly.
* In all cases, multifdsink will never close a file descriptor itself.
* The user of multifdsink is responsible for closing all file descriptors.
* This can for example be done in response to the #GstMultiFdSink::client-fd-removed signal.
* Note that multifdsink still has a reference to the file descriptor when the
* #GstMultiFdSink::client-removed signal is emitted, so that "get-stats" can be performed on
* the descriptor; it is therefore not safe to close the file descriptor in
* the #GstMultiFdSink::client-removed signal handler, and you should use the
* #GstMultiFdSink::client-fd-removed signal to safely close the fd.
*
* Multifdsink internally keeps a queue of the incoming 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.
*
* When adding a client to multifdsink, the #GstMultiFdSink:sync-method property will define
* which buffer in the queued buffers will be sent first to the client. Clients
* can be sent the most recent buffer (which might not be decodable by the
* client if 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 simple burst-on-connect).
* Multifdsink will always keep at least one keyframe in its internal buffers
* when the sync-mode is set to latest-keyframe.
*
* As of version 0.10.8, there are additional values for the #GstMultiFdSink:sync-method
* property to allow finer control over burst-on-connect behaviour. By selecting
* the 'burst' method a minimum burst size can be chosen, 'burst-keyframe'
* additionally requires that the burst begin with a keyframe, and
* 'burst-with-keyframe' attempts to burst beginning with a keyframe, but will
* prefer a minimum burst size even if it requires not starting with a keyframe.
*
* Multifdsink can be instructed to keep at least a minimum amount of data
* expressed in time or byte units in its internal queues with the
* #GstMultiFdSink:time-min and #GstMultiFdSink:bytes-min properties respectively.
* These properties are useful if the application adds clients with the
* #GstMultiFdSink::add-full signal to make sure that a burst connect can
* actually be honored.
*
* 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 slowly, data for that client will be
* queued up in multifdsink. Two properties control the amount of data
* (buffers) that is queued in multifdsink: #GstMultiFdSink:buffers-max and
* #GstMultiFdSink:buffers-soft-max. A client that falls behind by
* #GstMultiFdSink:buffers-max is removed from multifdsink forcibly.
*
* A client with a lag of at least #GstMultiFdSink:buffers-soft-max enters the recovery
* procedure which is controlled with the #GstMultiFdSink: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 at the most recent keyframe in the
* buffer queue.
*
* multifdsink will by default synchronize on the clock before serving the
* buffers to the clients. This behaviour can be disabled by setting the sync
* property to FALSE. Multifdsink will by default not do QoS and will never
* drop late buffers.
*
* Last reviewed on 2006-09-12 (0.10.10)
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst-i18n-plugin.h>
#include <sys/ioctl.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <netinet/in.h>
#ifdef HAVE_FIONREAD_IN_SYS_FILIO
#include <sys/filio.h>
#endif
#include "gstmultifdsink.h"
#include "gsttcp-marshal.h"
#define NOT_IMPLEMENTED 0
GST_DEBUG_CATEGORY_STATIC (multifdsink_debug);
#define GST_CAT_DEFAULT (multifdsink_debug)
/* MultiFdSink signals and args */
enum
{
/* methods */
SIGNAL_ADD,
SIGNAL_ADD_BURST,
SIGNAL_REMOVE,
SIGNAL_REMOVE_FLUSH,
SIGNAL_GET_STATS,
/* signals */
SIGNAL_CLIENT_ADDED,
SIGNAL_CLIENT_REMOVED,
SIGNAL_CLIENT_FD_REMOVED,
LAST_SIGNAL
};
/* this is really arbitrarily chosen */
#define DEFAULT_MODE 1
#define DEFAULT_HANDLE_READ TRUE
enum
{
PROP_0,
PROP_MODE,
PROP_HANDLE_READ,
PROP_NUM_FDS,
PROP_LAST
};
/* For backward compat, we can't really select the poll mode anymore with
* GstPoll. */
#define GST_TYPE_FDSET_MODE (gst_fdset_mode_get_type())
static GType
gst_fdset_mode_get_type (void)
{
static GType fdset_mode_type = 0;
static const GEnumValue fdset_mode[] = {
{0, "Select", "select"},
{1, "Poll", "poll"},
{2, "EPoll", "epoll"},
{0, NULL, NULL},
};
if (!fdset_mode_type) {
fdset_mode_type = g_enum_register_static ("GstFDSetMode", fdset_mode);
}
return fdset_mode_type;
}
static void gst_multi_fd_sink_finalize (GObject * object);
static void gst_multi_fd_sink_clear_post (GstMultiHandleSink * mhsink);
static void gst_multi_fd_sink_stop_pre (GstMultiHandleSink * mhsink);
static void gst_multi_fd_sink_stop_post (GstMultiHandleSink * mhsink);
static gboolean gst_multi_fd_sink_start_pre (GstMultiHandleSink * mhsink);
static gpointer gst_multi_fd_sink_thread (GstMultiHandleSink * mhsink);
static void gst_multi_fd_sink_queue_buffer (GstMultiHandleSink * mhsink,
GstBuffer * buffer);
static gboolean gst_multi_fd_sink_client_queue_buffer (GstMultiHandleSink *
mhsink, GstMultiHandleClient * mhclient, GstBuffer * buffer);
static int gst_multi_fd_sink_client_get_fd (GstMultiHandleClient * client);
static void gst_multi_fd_sink_remove_client_link (GstMultiHandleSink * sink,
GList * link);
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);
#define gst_multi_fd_sink_parent_class parent_class
G_DEFINE_TYPE (GstMultiFdSink, gst_multi_fd_sink, GST_TYPE_MULTI_HANDLE_SINK);
static guint gst_multi_fd_sink_signals[LAST_SIGNAL] = { 0 };
static void
gst_multi_fd_sink_class_init (GstMultiFdSinkClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstMultiHandleSinkClass *gstmultihandlesink_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstmultihandlesink_class = (GstMultiHandleSinkClass *) 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;
/**
* GstMultiFdSink::mode
*
* The mode for selecting activity on the fds.
*
* This property is deprecated since 0.10.18, if will now automatically
* select and use the most optimal method.
*/
g_object_class_install_property (gobject_class, PROP_MODE,
g_param_spec_enum ("mode", "Mode",
"The mode for selecting activity on the fds (deprecated)",
GST_TYPE_FDSET_MODE, DEFAULT_MODE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstMultiFdSink::handle-read
*
* Handle read requests from clients and discard the data.
*
* Since: 0.10.23
*/
g_object_class_install_property (gobject_class, PROP_HANDLE_READ,
g_param_spec_boolean ("handle-read", "Handle Read",
"Handle client reads and discard the data",
DEFAULT_HANDLE_READ, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_NUM_FDS,
g_param_spec_uint ("num-fds", "Number of fds",
"The current number of client file descriptors.",
0, G_MAXUINT, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
/**
* 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_SIGNAL_ACTION, G_STRUCT_OFFSET (GstMultiFdSinkClass,
add), NULL, NULL, g_cclosure_marshal_VOID__INT, G_TYPE_NONE, 1,
G_TYPE_INT);
/**
* GstMultiFdSink::add-full:
* @gstmultifdsink: the multifdsink element to emit this signal on
* @fd: the file descriptor to add to multifdsink
* @sync: the sync method to use
* @unit_format_min: the unit-format of @value_min
* @value_min: the minimum amount of data to burst expressed in
* @unit_format_min units.
* @unit_format_max: the unit-format of @value_max
* @value_max: the maximum amount of data to burst expressed in
* @unit_format_max units.
*
* Hand the given open file descriptor to multifdsink to write to and
* specify the burst parameters for the new connection.
*/
gst_multi_fd_sink_signals[SIGNAL_ADD_BURST] =
g_signal_new ("add-full", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_STRUCT_OFFSET (GstMultiFdSinkClass,
add_full), NULL, NULL,
gst_tcp_marshal_VOID__INT_ENUM_INT_UINT64_INT_UINT64,
G_TYPE_NONE, 6, G_TYPE_INT, GST_TYPE_SYNC_METHOD, GST_TYPE_FORMAT,
G_TYPE_UINT64, GST_TYPE_FORMAT, G_TYPE_UINT64);
/**
* 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_SIGNAL_ACTION, G_STRUCT_OFFSET (GstMultiFdSinkClass,
remove), NULL, NULL, gst_tcp_marshal_VOID__INT, G_TYPE_NONE,
1, G_TYPE_INT);
/**
* GstMultiFdSink::remove-flush:
* @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 after flushing all
* the pending data to the fd.
*/
gst_multi_fd_sink_signals[SIGNAL_REMOVE_FLUSH] =
g_signal_new ("remove-flush", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_STRUCT_OFFSET (GstMultiFdSinkClass,
remove_flush), NULL, NULL, gst_tcp_marshal_VOID__INT,
G_TYPE_NONE, 1, G_TYPE_INT);
/**
* 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 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 (in epoch seconds), number of buffers dropped.
* All times are expressed in nanoseconds (GstClockTime).
* The array can be 0-length if the client was not found.
*/
gst_multi_fd_sink_signals[SIGNAL_GET_STATS] =
g_signal_new ("get-stats", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, 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 emitted 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 emitted 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_ENUM,
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 emitted 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);
gst_element_class_set_details_simple (gstelement_class,
"Multi filedescriptor sink", "Sink/Network",
"Send data to multiple filedescriptors",
"Thomas Vander Stichele <thomas at apestaart dot org>, "
"Wim Taymans <wim@fluendo.com>");
gstmultihandlesink_class->clear_post =
GST_DEBUG_FUNCPTR (gst_multi_fd_sink_clear_post);
gstmultihandlesink_class->stop_pre =
GST_DEBUG_FUNCPTR (gst_multi_fd_sink_stop_pre);
gstmultihandlesink_class->stop_post =
GST_DEBUG_FUNCPTR (gst_multi_fd_sink_stop_post);
gstmultihandlesink_class->start_pre =
GST_DEBUG_FUNCPTR (gst_multi_fd_sink_start_pre);
gstmultihandlesink_class->thread =
GST_DEBUG_FUNCPTR (gst_multi_fd_sink_thread);
gstmultihandlesink_class->queue_buffer =
GST_DEBUG_FUNCPTR (gst_multi_fd_sink_queue_buffer);
gstmultihandlesink_class->client_queue_buffer =
GST_DEBUG_FUNCPTR (gst_multi_fd_sink_client_queue_buffer);
gstmultihandlesink_class->client_get_fd =
GST_DEBUG_FUNCPTR (gst_multi_fd_sink_client_get_fd);
gstmultihandlesink_class->remove_client_link =
GST_DEBUG_FUNCPTR (gst_multi_fd_sink_remove_client_link);
klass->add = GST_DEBUG_FUNCPTR (gst_multi_fd_sink_add);
klass->add_full = GST_DEBUG_FUNCPTR (gst_multi_fd_sink_add_full);
klass->remove = GST_DEBUG_FUNCPTR (gst_multi_fd_sink_remove);
klass->remove_flush = GST_DEBUG_FUNCPTR (gst_multi_fd_sink_remove_flush);
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)
{
this->mode = DEFAULT_MODE;
this->fd_hash = g_hash_table_new (g_int_hash, g_int_equal);
this->handle_read = DEFAULT_HANDLE_READ;
}
static void
gst_multi_fd_sink_finalize (GObject * object)
{
GstMultiFdSink *this = GST_MULTI_FD_SINK (object);
g_hash_table_destroy (this->fd_hash);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static int
gst_multi_fd_sink_client_get_fd (GstMultiHandleClient * client)
{
GstTCPClient *tclient = (GstTCPClient *) client;
return tclient->fd.fd;
}
/* "add-full" signal implementation */
void
gst_multi_fd_sink_add_full (GstMultiFdSink * sink, int fd,
GstSyncMethod sync_method, GstFormat min_format, guint64 min_value,
GstFormat max_format, guint64 max_value)
{
GstTCPClient *client;
GstMultiHandleClient *mhclient;
GList *clink;
gint flags;
struct stat statbuf;
GstMultiHandleSink *mhsink = GST_MULTI_HANDLE_SINK (sink);
GST_DEBUG_OBJECT (sink, "[fd %5d] adding client, sync_method %d, "
"min_format %d, min_value %" G_GUINT64_FORMAT
", max_format %d, max_value %" G_GUINT64_FORMAT, fd, sync_method,
min_format, min_value, max_format, max_value);
/* do limits check if we can */
if (min_format == max_format) {
if (max_value != -1 && min_value != -1 && max_value < min_value)
goto wrong_limits;
}
/* create client datastructure */
client = g_new0 (GstTCPClient, 1);
mhclient = (GstMultiHandleClient *) client;
gst_multi_handle_sink_client_init (mhclient, sync_method);
g_snprintf (mhclient->debug, 30, "[fd %5d]", fd);
client->fd.fd = fd;
mhclient->burst_min_format = min_format;
mhclient->burst_min_value = min_value;
mhclient->burst_max_format = max_format;
mhclient->burst_max_value = max_value;
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)
goto duplicate;
/* we can add the fd now */
clink = mhsink->clients = g_list_prepend (mhsink->clients, client);
g_hash_table_insert (sink->fd_hash, &client->fd.fd, clink);
mhsink->clients_cookie++;
/* set the socket to non blocking */
if (fcntl (fd, F_SETFL, O_NONBLOCK) < 0) {
GST_ERROR_OBJECT (sink, "failed to make socket %d non-blocking: %s", fd,
g_strerror (errno));
}
/* we always read from a client */
gst_poll_add_fd (sink->fdset, &client->fd);
/* we don't try to read from write only fds */
if (sink->handle_read) {
flags = fcntl (fd, F_GETFL, 0);
if ((flags & O_ACCMODE) != O_WRONLY) {
gst_poll_fd_ctl_read (sink->fdset, &client->fd, TRUE);
}
}
/* figure out the mode, can't use send() for non sockets */
if (fstat (fd, &statbuf) == 0 && S_ISSOCK (statbuf.st_mode)) {
client->is_socket = TRUE;
gst_multi_handle_sink_setup_dscp_client (mhsink, mhclient);
}
gst_poll_restart (sink->fdset);
CLIENTS_UNLOCK (sink);
g_signal_emit (G_OBJECT (sink),
gst_multi_fd_sink_signals[SIGNAL_CLIENT_ADDED], 0, fd);
return;
/* errors */
wrong_limits:
{
GST_WARNING_OBJECT (sink,
"[fd %5d] wrong values min =%" G_GUINT64_FORMAT ", max=%"
G_GUINT64_FORMAT ", unit %d specified when adding client", fd,
min_value, max_value, min_format);
return;
}
duplicate:
{
mhclient->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,
mhclient->status);
g_free (client);
return;
}
}
/* "add" signal implementation */
void
gst_multi_fd_sink_add (GstMultiFdSink * sink, int fd)
{
GstMultiHandleSink *mhsink;
mhsink = GST_MULTI_HANDLE_SINK (sink);
gst_multi_fd_sink_add_full (sink, fd, mhsink->def_sync_method,
mhsink->def_burst_format, mhsink->def_burst_value,
mhsink->def_burst_format, -1);
}
/* "remove" signal implementation */
void
gst_multi_fd_sink_remove (GstMultiFdSink * sink, int fd)
{
GList *clink;
GstMultiHandleSink *mhsink = GST_MULTI_HANDLE_SINK (sink);
GstMultiHandleSinkClass *mhsinkclass =
GST_MULTI_HANDLE_SINK_GET_CLASS (mhsink);
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;
GstMultiHandleClient *mhclient = (GstMultiHandleClient *) client;
if (mhclient->status != GST_CLIENT_STATUS_OK) {
GST_INFO_OBJECT (sink,
"[fd %5d] Client already disconnecting with status %d",
fd, mhclient->status);
goto done;
}
mhclient->status = GST_CLIENT_STATUS_REMOVED;
mhsinkclass->remove_client_link (GST_MULTI_HANDLE_SINK (sink), clink);
// FIXME: specific poll
gst_poll_restart (sink->fdset);
} else {
GST_WARNING_OBJECT (sink, "[fd %5d] no client with this fd found!", fd);
}
done:
CLIENTS_UNLOCK (sink);
}
/* "remove-flush" signal implementation */
void
gst_multi_fd_sink_remove_flush (GstMultiFdSink * sink, int fd)
{
GList *clink;
GST_DEBUG_OBJECT (sink, "[fd %5d] flushing client", fd);
CLIENTS_LOCK (sink);
clink = g_hash_table_lookup (sink->fd_hash, &fd);
if (clink != NULL) {
GstTCPClient *client = (GstTCPClient *) clink->data;
GstMultiHandleClient *mhclient = (GstMultiHandleClient *) client;
if (mhclient->status != GST_CLIENT_STATUS_OK) {
GST_INFO_OBJECT (sink,
"[fd %5d] Client already disconnecting with status %d",
fd, mhclient->status);
goto done;
}
/* take the position of the client as the number of buffers left to flush.
* If the client was at position -1, we flush 0 buffers, 0 == flush 1
* buffer, etc... */
mhclient->flushcount = mhclient->bufpos + 1;
/* mark client as flushing. We can not remove the client right away because
* it might have some buffers to flush in the ->sending queue. */
mhclient->status = GST_CLIENT_STATUS_FLUSHING;
} else {
GST_WARNING_OBJECT (sink, "[fd %5d] no client with this fd found!", fd);
}
done:
CLIENTS_UNLOCK (sink);
}
/* called with the CLIENTS_LOCK held */
static void
gst_multi_fd_sink_clear_post (GstMultiHandleSink * mhsink)
{
GstMultiFdSink *sink = GST_MULTI_FD_SINK (mhsink);
gst_poll_restart (sink->fdset);
}
/* "get-stats" signal implementation
* the array returned contains:
*
* guint64 : bytes_sent
* guint64 : connect time (in nanoseconds, since Epoch)
* guint64 : disconnect time (in nanoseconds, since Epoch)
* guint64 : time the client is/was connected (in nanoseconds)
* guint64 : last activity time (in nanoseconds, since Epoch)
* guint64 : buffers dropped due to recovery
* guint64 : timestamp of the first buffer sent (in nanoseconds)
* guint64 : timestamp of the last buffer sent (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);
if (clink == NULL)
goto noclient;
client = (GstTCPClient *) clink->data;
if (client != NULL) {
GstMultiHandleClient *mhclient = (GstMultiHandleClient *) client;
GValue value = { 0 };
guint64 interval;
result = g_value_array_new (7);
g_value_init (&value, G_TYPE_UINT64);
g_value_set_uint64 (&value, mhclient->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, mhclient->connect_time);
result = g_value_array_append (result, &value);
g_value_unset (&value);
if (mhclient->disconnect_time == 0) {
GTimeVal nowtv;
g_get_current_time (&nowtv);
interval = GST_TIMEVAL_TO_TIME (nowtv) - mhclient->connect_time;
} else {
interval = mhclient->disconnect_time - mhclient->connect_time;
}
g_value_init (&value, G_TYPE_UINT64);
g_value_set_uint64 (&value, mhclient->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, mhclient->last_activity_time);
result = g_value_array_append (result, &value);
g_value_unset (&value);
g_value_init (&value, G_TYPE_UINT64);
g_value_set_uint64 (&value, mhclient->dropped_buffers);
result = g_value_array_append (result, &value);
g_value_unset (&value);
g_value_init (&value, G_TYPE_UINT64);
g_value_set_uint64 (&value, mhclient->first_buffer_ts);
result = g_value_array_append (result, &value);
g_value_unset (&value);
g_value_init (&value, G_TYPE_UINT64);
g_value_set_uint64 (&value, mhclient->last_buffer_ts);
result = g_value_array_append (result, &value);
}
noclient:
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 helt.
* 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-fd-removed signal and
* close the fd itself.
*/
static void
gst_multi_fd_sink_remove_client_link (GstMultiHandleSink * sink, GList * link)
{
int fd;
GTimeVal now;
GstTCPClient *client = (GstTCPClient *) link->data;
GstMultiHandleClient *mhclient = (GstMultiHandleClient *) client;
GstMultiFdSink *mfsink = GST_MULTI_FD_SINK (sink);
GstMultiFdSinkClass *fclass;
fclass = GST_MULTI_FD_SINK_GET_CLASS (sink);
fd = client->fd.fd;
if (mhclient->currently_removing) {
GST_WARNING_OBJECT (sink, "%s client is already being removed",
mhclient->debug);
return;
} else {
mhclient->currently_removing = TRUE;
}
/* FIXME: if we keep track of ip we can log it here and signal */
switch (mhclient->status) {
case GST_CLIENT_STATUS_OK:
GST_WARNING_OBJECT (sink, "%s removing client %p for no reason",
mhclient->debug, client);
break;
case GST_CLIENT_STATUS_CLOSED:
GST_DEBUG_OBJECT (sink, "%s removing client %p because of close",
mhclient->debug, client);
break;
case GST_CLIENT_STATUS_REMOVED:
GST_DEBUG_OBJECT (sink,
"%s removing client %p because the app removed it", mhclient->debug,
client);
break;
case GST_CLIENT_STATUS_SLOW:
GST_INFO_OBJECT (sink,
"%s removing client %p because it was too slow", mhclient->debug,
client);
break;
case GST_CLIENT_STATUS_ERROR:
GST_WARNING_OBJECT (sink,
"%s removing client %p because of error", mhclient->debug, client);
break;
case GST_CLIENT_STATUS_FLUSHING:
default:
GST_WARNING_OBJECT (sink,
"%s removing client %p with invalid reason %d", mhclient->debug,
client, mhclient->status);
break;
}
gst_poll_remove_fd (mfsink->fdset, &client->fd);
g_get_current_time (&now);
mhclient->disconnect_time = GST_TIMEVAL_TO_TIME (now);
/* free client buffers */
g_slist_foreach (mhclient->sending, (GFunc) gst_mini_object_unref, NULL);
g_slist_free (mhclient->sending);
mhclient->sending = NULL;
if (mhclient->caps)
gst_caps_unref (mhclient->caps);
mhclient->caps = 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,
mhclient->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 (mfsink->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);
sink->clients_cookie++;
if (fclass->removed)
fclass->removed (mfsink, 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;
GstMultiHandleClient *mhclient = (GstMultiHandleClient *) client;
fd = client->fd.fd;
if (ioctl (fd, FIONREAD, &avail) < 0)
goto ioctl_failed;
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);
mhclient->status = GST_CLIENT_STATUS_CLOSED;
ret = FALSE;
} else if (avail < 0) {
GST_WARNING_OBJECT (sink, "[fd %5d] avail < 0, removing", fd);
mhclient->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);
mhclient->status = GST_CLIENT_STATUS_ERROR;
ret = FALSE;
break;
} else if (nread == 0) {
GST_WARNING_OBJECT (sink, "[fd %5d] 0 bytes in read, removing", fd);
mhclient->status = GST_CLIENT_STATUS_ERROR;
ret = FALSE;
break;
}
avail -= nread;
}
while (avail > 0);
}
return ret;
/* ERRORS */
ioctl_failed:
{
GST_WARNING_OBJECT (sink, "[fd %5d] ioctl failed: %s (%d)",
fd, g_strerror (errno), errno);
mhclient->status = GST_CLIENT_STATUS_ERROR;
return FALSE;
}
}
/* queue the given buffer for the given client */
static gboolean
gst_multi_fd_sink_client_queue_buffer (GstMultiHandleSink * mhsink,
GstMultiHandleClient * mhclient, GstBuffer * buffer)
{
GstCaps *caps;
/* TRUE: send them if the new caps have them */
gboolean send_streamheader = FALSE;
GstStructure *s;
GstMultiFdSink *sink = GST_MULTI_FD_SINK (mhsink);
GstTCPClient *client = (GstTCPClient *) mhclient;
/* before we queue the buffer, we check if we need to queue streamheader
* buffers (because it's a new client, or because they changed) */
caps = gst_pad_get_current_caps (GST_BASE_SINK_PAD (sink));
if (!mhclient->caps) {
GST_DEBUG_OBJECT (sink,
"[fd %5d] no previous caps for this client, send streamheader",
client->fd.fd);
send_streamheader = TRUE;
mhclient->caps = gst_caps_ref (caps);
} else {
/* there were previous caps recorded, so compare */
if (!gst_caps_is_equal (caps, mhclient->caps)) {
const GValue *sh1, *sh2;
/* caps are not equal, but could still have the same streamheader */
s = gst_caps_get_structure (caps, 0);
if (!gst_structure_has_field (s, "streamheader")) {
/* no new streamheader, so nothing new to send */
GST_DEBUG_OBJECT (sink,
"[fd %5d] new caps do not have streamheader, not sending",
client->fd.fd);
} else {
/* there is a new streamheader */
s = gst_caps_get_structure (mhclient->caps, 0);
if (!gst_structure_has_field (s, "streamheader")) {
/* no previous streamheader, so send the new one */
GST_DEBUG_OBJECT (sink,
"[fd %5d] previous caps did not have streamheader, sending",
client->fd.fd);
send_streamheader = TRUE;
} else {
/* both old and new caps have streamheader set */
if (!mhsink->resend_streamheader) {
GST_DEBUG_OBJECT (sink,
"[fd %5d] asked to not resend the streamheader, not sending",
client->fd.fd);
send_streamheader = FALSE;
} else {
sh1 = gst_structure_get_value (s, "streamheader");
s = gst_caps_get_structure (caps, 0);
sh2 = gst_structure_get_value (s, "streamheader");
if (gst_value_compare (sh1, sh2) != GST_VALUE_EQUAL) {
GST_DEBUG_OBJECT (sink,
"[fd %5d] new streamheader different from old, sending",
client->fd.fd);
send_streamheader = TRUE;
}
}
}
}
}
/* Replace the old caps */
gst_caps_unref (mhclient->caps);
mhclient->caps = gst_caps_ref (caps);
}
if (G_UNLIKELY (send_streamheader)) {
const GValue *sh;
GArray *buffers;
int i;
GST_LOG_OBJECT (sink,
"[fd %5d] sending streamheader from caps %" GST_PTR_FORMAT,
client->fd.fd, caps);
s = gst_caps_get_structure (caps, 0);
if (!gst_structure_has_field (s, "streamheader")) {
GST_DEBUG_OBJECT (sink,
"[fd %5d] no new streamheader, so nothing to send", client->fd.fd);
} else {
GST_LOG_OBJECT (sink,
"[fd %5d] sending streamheader from caps %" GST_PTR_FORMAT,
client->fd.fd, caps);
sh = gst_structure_get_value (s, "streamheader");
g_assert (G_VALUE_TYPE (sh) == GST_TYPE_ARRAY);
buffers = g_value_peek_pointer (sh);
GST_DEBUG_OBJECT (sink, "%d streamheader buffers", buffers->len);
for (i = 0; i < buffers->len; ++i) {
GValue *bufval;
GstBuffer *buffer;
bufval = &g_array_index (buffers, GValue, i);
g_assert (G_VALUE_TYPE (bufval) == GST_TYPE_BUFFER);
buffer = g_value_peek_pointer (bufval);
GST_DEBUG_OBJECT (sink,
"[fd %5d] queueing streamheader buffer of length %" G_GSIZE_FORMAT,
client->fd.fd, gst_buffer_get_size (buffer));
gst_buffer_ref (buffer);
mhclient->sending = g_slist_append (mhclient->sending, buffer);
}
}
}
gst_caps_unref (caps);
caps = NULL;
GST_LOG_OBJECT (sink, "[fd %5d] queueing buffer of length %" G_GSIZE_FORMAT,
client->fd.fd, gst_buffer_get_size (buffer));
gst_buffer_ref (buffer);
mhclient->sending = g_slist_append (mhclient->sending, buffer);
return TRUE;
}
/* 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.
*
* We first check to see if we need to send 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 mhclient->sending queue and if the queue
* is empty, it will pick a buffer from the global queue.
*
* Sending the buffers from the mhclient->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
* mhclient->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 flushing;
GstClockTime now;
GTimeVal nowtv;
GstMultiHandleSink *mhsink = GST_MULTI_HANDLE_SINK (sink);
GstMultiHandleSinkClass *mhsinkclass =
GST_MULTI_HANDLE_SINK_GET_CLASS (mhsink);
GstMultiHandleClient *mhclient = (GstMultiHandleClient *) client;
g_get_current_time (&nowtv);
now = GST_TIMEVAL_TO_TIME (nowtv);
flushing = mhclient->status == GST_CLIENT_STATUS_FLUSHING;
more = TRUE;
do {
gint maxsize;
if (!mhclient->sending) {
/* client is not working on a buffer */
if (mhclient->bufpos == -1) {
/* client is too fast, remove from write queue until new buffer is
* available */
// FIXME: specific
gst_poll_fd_ctl_write (sink->fdset, &client->fd, FALSE);
//
/* if we flushed out all of the client buffers, we can stop */
if (mhclient->flushcount == 0)
goto flushed;
return TRUE;
} else {
/* client can pick a buffer from the global queue */
GstBuffer *buf;
GstClockTime timestamp;
/* for new connections, we need to find a good spot in the
* bufqueue to start streaming from */
if (mhclient->new_connection && !flushing) {
gint position = gst_multi_handle_sink_new_client (mhsink, mhclient);
if (position >= 0) {
/* we got a valid spot in the queue */
mhclient->new_connection = FALSE;
mhclient->bufpos = position;
} else {
/* cannot send data to this client yet */
// FIXME: specific
gst_poll_fd_ctl_write (sink->fdset, &client->fd, FALSE);
return TRUE;
}
}
/* we flushed all remaining buffers, no need to get a new one */
if (mhclient->flushcount == 0)
goto flushed;
/* grab buffer */
buf = g_array_index (mhsink->bufqueue, GstBuffer *, mhclient->bufpos);
mhclient->bufpos--;
/* update stats */
timestamp = GST_BUFFER_TIMESTAMP (buf);
if (mhclient->first_buffer_ts == GST_CLOCK_TIME_NONE)
mhclient->first_buffer_ts = timestamp;
if (timestamp != -1)
mhclient->last_buffer_ts = timestamp;
/* decrease flushcount */
if (mhclient->flushcount != -1)
mhclient->flushcount--;
GST_LOG_OBJECT (sink, "[fd %5d] client %p at position %d",
fd, client, mhclient->bufpos);
/* queueing a buffer will ref it */
mhsinkclass->client_queue_buffer (mhsink, mhclient, buf);
/* need to start from the first byte for this new buffer */
mhclient->bufoffset = 0;
}
}
/* see if we need to send something */
if (mhclient->sending) {
ssize_t wrote;
GstBuffer *head;
GstMapInfo info;
guint8 *data;
/* pick first buffer from list */
head = GST_BUFFER (mhclient->sending->data);
g_assert (gst_buffer_map (head, &info, GST_MAP_READ));
data = info.data;
maxsize = info.size - mhclient->bufoffset;
// FIXME: specific
/* 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, data + mhclient->bufoffset, maxsize, FLAGS);
} else {
wrote = write (fd, data + mhclient->bufoffset, maxsize);
}
gst_buffer_unmap (head, &info);
if (wrote < 0) {
/* hmm error.. */
if (errno == EAGAIN) {
/* nothing serious, resource was unavailable, try again later */
more = FALSE;
} else if (errno == ECONNRESET) {
goto connection_reset;
} else {
goto write_error;
}
} 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 %" G_GSSIZE_FORMAT " bytes", fd, wrote);
mhclient->bufoffset += wrote;
more = FALSE;
} else {
/* complete buffer was written, we can proceed to the next one */
mhclient->sending = g_slist_remove (mhclient->sending, head);
gst_buffer_unref (head);
/* make sure we start from byte 0 for the next buffer */
mhclient->bufoffset = 0;
}
/* update stats */
mhclient->bytes_sent += wrote;
mhclient->last_activity_time = now;
mhsink->bytes_served += wrote;
}
}
} while (more);
return TRUE;
/* ERRORS */
flushed:
{
GST_DEBUG_OBJECT (sink, "[fd %5d] flushed, removing", fd);
mhclient->status = GST_CLIENT_STATUS_REMOVED;
return FALSE;
}
connection_reset:
{
GST_DEBUG_OBJECT (sink, "[fd %5d] connection reset by peer, removing", fd);
mhclient->status = GST_CLIENT_STATUS_CLOSED;
return FALSE;
}
write_error:
{
GST_WARNING_OBJECT (sink,
"[fd %5d] could not write, removing client: %s (%d)", fd,
g_strerror (errno), errno);
mhclient->status = GST_CLIENT_STATUS_ERROR;
return FALSE;
}
}
/* 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
* mhclient->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 signaling
* the select thread that the fd_set changed.
*/
static void
gst_multi_fd_sink_queue_buffer (GstMultiHandleSink * mhsink, GstBuffer * buffer)
{
GList *clients, *next;
gint queuelen;
gboolean need_signal = FALSE;
gint max_buffer_usage;
gint i;
GTimeVal nowtv;
GstClockTime now;
gint max_buffers, soft_max_buffers;
guint cookie;
GstMultiFdSink *sink = GST_MULTI_FD_SINK (mhsink);
GstMultiHandleSinkClass *mhsinkclass =
GST_MULTI_HANDLE_SINK_GET_CLASS (mhsink);
g_get_current_time (&nowtv);
now = GST_TIMEVAL_TO_TIME (nowtv);
CLIENTS_LOCK (mhsink);
/* add buffer to queue */
g_array_prepend_val (mhsink->bufqueue, buffer);
queuelen = mhsink->bufqueue->len;
if (mhsink->units_max > 0)
max_buffers = get_buffers_max (mhsink, mhsink->units_max);
else
max_buffers = -1;
if (mhsink->units_soft_max > 0)
soft_max_buffers = get_buffers_max (mhsink, mhsink->units_soft_max);
else
soft_max_buffers = -1;
GST_LOG_OBJECT (sink, "Using max %d, softmax %d", max_buffers,
soft_max_buffers);
/* then loop over the clients and update the positions */
max_buffer_usage = 0;
restart:
cookie = mhsink->clients_cookie;
for (clients = mhsink->clients; clients; clients = next) {
GstTCPClient *client;
GstMultiHandleClient *mhclient;
if (cookie != mhsink->clients_cookie) {
GST_DEBUG_OBJECT (sink, "Clients cookie outdated, restarting");
goto restart;
}
client = (GstTCPClient *) clients->data;
mhclient = (GstMultiHandleClient *) client;
next = g_list_next (clients);
mhclient->bufpos++;
GST_LOG_OBJECT (sink, "[fd %5d] client %p at position %d",
client->fd.fd, client, mhclient->bufpos);
/* check soft max if needed, recover client */
if (soft_max_buffers > 0 && mhclient->bufpos >= soft_max_buffers) {
gint newpos;
newpos = gst_multi_handle_sink_recover_client (mhsink, mhclient);
if (newpos != mhclient->bufpos) {
mhclient->dropped_buffers += mhclient->bufpos - newpos;
mhclient->bufpos = newpos;
mhclient->discont = TRUE;
GST_INFO_OBJECT (sink, "[fd %5d] client %p position reset to %d",
client->fd.fd, client, mhclient->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 ((max_buffers > 0 && mhclient->bufpos >= max_buffers) ||
(mhsink->timeout > 0
&& now - mhclient->last_activity_time > mhsink->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 */
mhclient->status = GST_CLIENT_STATUS_SLOW;
/* set client to invalid position while being removed */
mhclient->bufpos = -1;
mhsinkclass->remove_client_link (mhsink, clients);
need_signal = TRUE;
continue;
} else if (mhclient->bufpos == 0 || mhclient->new_connection) {
/* can send data to this client now. need to signal the select thread that
* the fd_set changed */
gst_poll_fd_ctl_write (sink->fdset, &client->fd, TRUE);
need_signal = TRUE;
}
/* keep track of maximum buffer usage */
if (mhclient->bufpos > max_buffer_usage) {
max_buffer_usage = mhclient->bufpos;
}
}
/* make sure we respect bytes-min, buffers-min and time-min when they are set */
{
gint usage, max;
GST_LOG_OBJECT (sink,
"extending queue %d to respect time_min %" GST_TIME_FORMAT
", bytes_min %d, buffers_min %d", max_buffer_usage,
GST_TIME_ARGS (mhsink->time_min), mhsink->bytes_min,
mhsink->buffers_min);
/* get index where the limits are ok, we don't really care if all limits
* are ok, we just queue as much as we need. We also don't compare against
* the max limits. */
find_limits (mhsink, &usage, mhsink->bytes_min, mhsink->buffers_min,
mhsink->time_min, &max, -1, -1, -1);
max_buffer_usage = MAX (max_buffer_usage, usage + 1);
GST_LOG_OBJECT (sink, "extended queue to %d", max_buffer_usage);
}
/* now look for sync points and make sure there is at least one
* sync point in the queue. We only do this if the LATEST_KEYFRAME or
* BURST_KEYFRAME mode is selected */
if (mhsink->def_sync_method == GST_SYNC_METHOD_LATEST_KEYFRAME ||
mhsink->def_sync_method == GST_SYNC_METHOD_BURST_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 (soft_max_buffers > 0) {
limit = MIN (limit, soft_max_buffers);
}
GST_LOG_OBJECT (sink,
"extending queue to include sync point, now at %d, limit is %d",
max_buffer_usage, limit);
for (i = 0; i < limit; i++) {
buf = g_array_index (mhsink->bufqueue, GstBuffer *, i);
if (is_sync_frame (mhsink, 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);
}
GST_LOG_OBJECT (sink, "len %d, usage %d", queuelen, 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 (mhsink->bufqueue, GstBuffer *, i);
mhsink->bufqueue = g_array_remove_index (mhsink->bufqueue, i);
/* unref tail buffer */
gst_buffer_unref (old);
}
/* save for stats */
mhsink->buffers_queued = max_buffer_usage;
CLIENTS_UNLOCK (sink);
/* and send a signal to thread if fd_set changed */
if (need_signal) {
gst_poll_restart (sink->fdset);
}
}
/* 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;
guint cookie;
GstMultiHandleSink *mhsink = GST_MULTI_HANDLE_SINK (sink);
GstMultiHandleSinkClass *mhsinkclass =
GST_MULTI_HANDLE_SINK_GET_CLASS (mhsink);
fclass = GST_MULTI_FD_SINK_GET_CLASS (sink);
do {
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_poll_wait (sink->fdset,
mhsink->timeout != 0 ? mhsink->timeout : GST_CLOCK_TIME_NONE);
/* Handle the special case in which the sink is not receiving more buffers
* and will not disconnect inactive client in the streaming thread. */
if (G_UNLIKELY (result == 0)) {
GstClockTime now;
GTimeVal nowtv;
g_get_current_time (&nowtv);
now = GST_TIMEVAL_TO_TIME (nowtv);
CLIENTS_LOCK (sink);
for (clients = mhsink->clients; clients; clients = next) {
GstTCPClient *client;
GstMultiHandleClient *mhclient;
client = (GstTCPClient *) clients->data;
mhclient = (GstMultiHandleClient *) client;
next = g_list_next (clients);
if (mhsink->timeout > 0
&& now - mhclient->last_activity_time > mhsink->timeout) {
mhclient->status = GST_CLIENT_STATUS_SLOW;
mhsinkclass->remove_client_link (mhsink, clients);
}
}
CLIENTS_UNLOCK (sink);
return;
} else 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);
restart:
cookie = mhsink->clients_cookie;
for (clients = mhsink->clients; clients; clients = next) {
GstTCPClient *client;
GstMultiHandleClient *mhclient;
int fd;
long flags;
int res;
if (cookie != mhsink->clients_cookie) {
GST_DEBUG_OBJECT (sink, "Cookie changed finding bad fd");
goto restart;
}
client = (GstTCPClient *) clients->data;
mhclient = (GstMultiHandleClient *) client;
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) {
mhclient->status = GST_CLIENT_STATUS_ERROR;
/* releases the CLIENTS lock */
mhsinkclass->remove_client_link (mhsink, 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 wait */
try_again = TRUE;
} else if (errno == EBUSY) {
/* the call to gst_poll_wait() was flushed */
return;
} 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);
}
} 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);
restart2:
cookie = mhsink->clients_cookie;
for (clients = mhsink->clients; clients; clients = next) {
GstTCPClient *client;
GstMultiHandleClient *mhclient;
if (mhsink->clients_cookie != cookie) {
GST_DEBUG_OBJECT (sink, "Restarting loop, cookie out of date");
goto restart2;
}
client = (GstTCPClient *) clients->data;
mhclient = (GstMultiHandleClient *) client;
next = g_list_next (clients);
if (mhclient->status != GST_CLIENT_STATUS_FLUSHING
&& mhclient->status != GST_CLIENT_STATUS_OK) {
mhsinkclass->remove_client_link (mhsink, clients);
continue;
}
if (gst_poll_fd_has_closed (sink->fdset, &client->fd)) {
mhclient->status = GST_CLIENT_STATUS_CLOSED;
mhsinkclass->remove_client_link (mhsink, clients);
continue;
}
if (gst_poll_fd_has_error (sink->fdset, &client->fd)) {
GST_WARNING_OBJECT (sink, "gst_poll_fd_has_error for %d", client->fd.fd);
mhclient->status = GST_CLIENT_STATUS_ERROR;
mhsinkclass->remove_client_link (mhsink, clients);
continue;
}
if (gst_poll_fd_can_read (sink->fdset, &client->fd)) {
/* handle client read */
if (!gst_multi_fd_sink_handle_client_read (sink, client)) {
mhsinkclass->remove_client_link (mhsink, clients);
continue;
}
}
if (gst_poll_fd_can_write (sink->fdset, &client->fd)) {
/* handle client write */
if (!gst_multi_fd_sink_handle_client_write (sink, client)) {
mhsinkclass->remove_client_link (mhsink, 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 (GstMultiHandleSink * mhsink)
{
GstMultiFdSink *sink = GST_MULTI_FD_SINK (mhsink);
while (mhsink->running) {
gst_multi_fd_sink_handle_clients (sink);
}
return NULL;
}
static void
gst_multi_fd_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstMultiFdSink *multifdsink;
multifdsink = GST_MULTI_FD_SINK (object);
switch (prop_id) {
case PROP_MODE:
multifdsink->mode = g_value_get_enum (value);
break;
case PROP_HANDLE_READ:
multifdsink->handle_read = g_value_get_boolean (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;
multifdsink = GST_MULTI_FD_SINK (object);
switch (prop_id) {
case PROP_MODE:
g_value_set_enum (value, multifdsink->mode);
break;
case PROP_HANDLE_READ:
g_value_set_boolean (value, multifdsink->handle_read);
break;
case PROP_NUM_FDS:
g_value_set_uint (value, g_hash_table_size (multifdsink->fd_hash));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_multi_fd_sink_start_pre (GstMultiHandleSink * mhsink)
{
GstMultiFdSink *mfsink = GST_MULTI_FD_SINK (mhsink);
GST_INFO_OBJECT (mfsink, "starting in mode %d", mfsink->mode);
if ((mfsink->fdset = gst_poll_new (TRUE)) == NULL)
goto socket_pair;
return TRUE;
/* ERRORS */
socket_pair:
{
GST_ELEMENT_ERROR (mfsink, RESOURCE, OPEN_READ_WRITE, (NULL),
GST_ERROR_SYSTEM);
return FALSE;
}
}
static gboolean
multifdsink_hash_remove (gpointer key, gpointer value, gpointer data)
{
return TRUE;
}
static void
gst_multi_fd_sink_stop_pre (GstMultiHandleSink * mhsink)
{
GstMultiFdSink *mfsink = GST_MULTI_FD_SINK (mhsink);
gst_poll_set_flushing (mfsink->fdset, TRUE);
}
static void
gst_multi_fd_sink_stop_post (GstMultiHandleSink * mhsink)
{
GstMultiFdSink *mfsink = GST_MULTI_FD_SINK (mhsink);
if (mfsink->fdset) {
gst_poll_free (mfsink->fdset);
mfsink->fdset = NULL;
}
g_hash_table_foreach_remove (mfsink->fd_hash, multifdsink_hash_remove,
mfsink);
}
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