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gstreamer/gst/tcp/gstmultifdsink.c
Mark Nauwelaerts 6a87cb5248 tcp: adjust comment style
2012-09-10 14:03:49 +02:00

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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 <string.h>
#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_HANDLE_READ TRUE
enum
{
PROP_0,
PROP_HANDLE_READ,
PROP_LAST
};
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_add (GstMultiFdSink * sink, int fd);
static void gst_multi_fd_sink_add_full (GstMultiFdSink * sink, int fd,
GstSyncMethod sync, GstFormat min_format, guint64 min_value,
GstFormat max_format, guint64 max_value);
static void gst_multi_fd_sink_remove (GstMultiFdSink * sink, int fd);
static void gst_multi_fd_sink_remove_flush (GstMultiFdSink * sink, int fd);
static GstStructure *gst_multi_fd_sink_get_stats (GstMultiFdSink * sink,
int fd);
static void gst_multi_fd_sink_emit_client_added (GstMultiHandleSink * mhsink,
GstMultiSinkHandle handle);
static void gst_multi_fd_sink_emit_client_removed (GstMultiHandleSink * mhsink,
GstMultiSinkHandle handle, GstClientStatus status);
static GstMultiHandleClient *gst_multi_fd_sink_new_client (GstMultiHandleSink *
mhsink, GstMultiSinkHandle handle, GstSyncMethod sync_method);
static void gst_multi_fd_sink_client_free (GstMultiHandleSink * m,
GstMultiHandleClient * client);
static int gst_multi_fd_sink_client_get_fd (GstMultiHandleClient * client);
static void gst_multi_fd_sink_handle_debug (GstMultiSinkHandle handle,
gchar debug[30]);
static gpointer gst_multi_fd_sink_handle_hash_key (GstMultiSinkHandle handle);
static void gst_multi_fd_sink_hash_adding (GstMultiHandleSink * mhsink,
GstMultiHandleClient * mhclient);
static void gst_multi_fd_sink_hash_removing (GstMultiHandleSink * mhsink,
GstMultiHandleClient * mhclient);
static void gst_multi_fd_sink_hash_changed (GstMultiHandleSink * mhsink);
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;
/**
* 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));
/**
* 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
* @format_min: the format of @value_min
* @value_min: the minimum amount of data to burst expressed in
* @format_min units.
* @format_max: the format of @value_max
* @value_max: the maximum amount of data to burst expressed in
* @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, GST_TYPE_STRUCTURE, 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, 0, 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, 0, 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, 0, NULL, NULL, gst_tcp_marshal_VOID__INT,
G_TYPE_NONE, 1, G_TYPE_INT);
gst_element_class_set_static_metadata (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>");
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);
gstmultihandlesink_class->emit_client_added =
gst_multi_fd_sink_emit_client_added;
gstmultihandlesink_class->emit_client_removed =
gst_multi_fd_sink_emit_client_removed;
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->new_client =
GST_DEBUG_FUNCPTR (gst_multi_fd_sink_new_client);
gstmultihandlesink_class->client_free = gst_multi_fd_sink_client_free;
gstmultihandlesink_class->client_get_fd =
GST_DEBUG_FUNCPTR (gst_multi_fd_sink_client_get_fd);
gstmultihandlesink_class->handle_debug =
GST_DEBUG_FUNCPTR (gst_multi_fd_sink_handle_debug);
gstmultihandlesink_class->handle_hash_key =
GST_DEBUG_FUNCPTR (gst_multi_fd_sink_handle_hash_key);
gstmultihandlesink_class->hash_changed =
GST_DEBUG_FUNCPTR (gst_multi_fd_sink_hash_changed);
gstmultihandlesink_class->hash_adding =
GST_DEBUG_FUNCPTR (gst_multi_fd_sink_hash_adding);
gstmultihandlesink_class->hash_removing =
GST_DEBUG_FUNCPTR (gst_multi_fd_sink_hash_removing);
GST_DEBUG_CATEGORY_INIT (multifdsink_debug, "multifdsink", 0, "FD sink");
}
static void
gst_multi_fd_sink_init (GstMultiFdSink * this)
{
GstMultiHandleSink *mhsink = GST_MULTI_HANDLE_SINK (this);
mhsink->handle_hash = g_hash_table_new (g_direct_hash, g_direct_equal);
this->handle_read = DEFAULT_HANDLE_READ;
}
/* methods to emit signals */
static void
gst_multi_fd_sink_emit_client_added (GstMultiHandleSink * mhsink,
GstMultiSinkHandle handle)
{
g_signal_emit (mhsink, gst_multi_fd_sink_signals[SIGNAL_CLIENT_ADDED], 0,
handle.fd);
}
static void
gst_multi_fd_sink_emit_client_removed (GstMultiHandleSink * mhsink,
GstMultiSinkHandle handle, GstClientStatus status)
{
g_signal_emit (mhsink, gst_multi_fd_sink_signals[SIGNAL_CLIENT_REMOVED], 0,
handle.fd, status);
}
static void
gst_multi_fd_sink_client_free (GstMultiHandleSink * mhsink,
GstMultiHandleClient * client)
{
g_signal_emit (mhsink, gst_multi_fd_sink_signals[SIGNAL_CLIENT_FD_REMOVED],
0, client->handle.fd);
}
/* action signals */
static void
gst_multi_fd_sink_add (GstMultiFdSink * sink, int fd)
{
GstMultiSinkHandle handle;
handle.fd = fd;
gst_multi_handle_sink_add (GST_MULTI_HANDLE_SINK_CAST (sink), handle);
}
static void
gst_multi_fd_sink_add_full (GstMultiFdSink * sink, int fd,
GstSyncMethod sync, GstFormat min_format, guint64 min_value,
GstFormat max_format, guint64 max_value)
{
GstMultiSinkHandle handle;
handle.fd = fd;
gst_multi_handle_sink_add_full (GST_MULTI_HANDLE_SINK_CAST (sink), handle,
sync, min_format, min_value, max_format, max_value);
}
static void
gst_multi_fd_sink_remove (GstMultiFdSink * sink, int fd)
{
GstMultiSinkHandle handle;
handle.fd = fd;
gst_multi_handle_sink_remove (GST_MULTI_HANDLE_SINK_CAST (sink), handle);
}
static void
gst_multi_fd_sink_remove_flush (GstMultiFdSink * sink, int fd)
{
GstMultiSinkHandle handle;
handle.fd = fd;
gst_multi_handle_sink_remove_flush (GST_MULTI_HANDLE_SINK_CAST (sink),
handle);
}
static GstStructure *
gst_multi_fd_sink_get_stats (GstMultiFdSink * sink, int fd)
{
GstMultiSinkHandle handle;
handle.fd = fd;
return gst_multi_handle_sink_get_stats (GST_MULTI_HANDLE_SINK_CAST (sink),
handle);
}
/* vfuncs */
static GstMultiHandleClient *
gst_multi_fd_sink_new_client (GstMultiHandleSink * mhsink,
GstMultiSinkHandle handle, GstSyncMethod sync_method)
{
struct stat statbuf;
GstTCPClient *client;
GstMultiHandleClient *mhclient;
GstMultiFdSink *sink = GST_MULTI_FD_SINK (mhsink);
GstMultiHandleSinkClass *mhsinkclass =
GST_MULTI_HANDLE_SINK_GET_CLASS (mhsink);
/* create client datastructure */
client = g_new0 (GstTCPClient, 1);
mhclient = (GstMultiHandleClient *) client;
mhclient->handle = handle;
gst_poll_fd_init (&client->gfd);
client->gfd.fd = mhclient->handle.fd;
gst_multi_handle_sink_client_init (mhclient, sync_method);
mhsinkclass->handle_debug (handle, mhclient->debug);
/* set the socket to non blocking */
if (fcntl (handle.fd, F_SETFL, O_NONBLOCK) < 0) {
GST_ERROR_OBJECT (mhsink, "failed to make socket %s non-blocking: %s",
mhclient->debug, g_strerror (errno));
}
/* we always read from a client */
gst_poll_add_fd (sink->fdset, &client->gfd);
/* we don't try to read from write only fds */
if (sink->handle_read) {
gint flags;
flags = fcntl (handle.fd, F_GETFL, 0);
if ((flags & O_ACCMODE) != O_WRONLY) {
gst_poll_fd_ctl_read (sink->fdset, &client->gfd, TRUE);
}
}
/* figure out the mode, can't use send() for non sockets */
if (fstat (handle.fd, &statbuf) == 0 && S_ISSOCK (statbuf.st_mode)) {
client->is_socket = TRUE;
gst_multi_handle_sink_setup_dscp_client (mhsink, mhclient);
}
return mhclient;
}
static int
gst_multi_fd_sink_client_get_fd (GstMultiHandleClient * client)
{
GstTCPClient *tclient = (GstTCPClient *) client;
return tclient->gfd.fd;
}
static void
gst_multi_fd_sink_handle_debug (GstMultiSinkHandle handle, gchar debug[30])
{
g_snprintf (debug, 30, "[fd %5d]", handle.fd);
}
static gpointer
gst_multi_fd_sink_handle_hash_key (GstMultiSinkHandle handle)
{
return GINT_TO_POINTER (handle.fd);
}
static void
gst_multi_fd_sink_hash_changed (GstMultiHandleSink * mhsink)
{
GstMultiFdSink *sink = GST_MULTI_FD_SINK (mhsink);
gst_poll_restart (sink->fdset);
}
/* 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->gfd.fd;
if (ioctl (fd, FIONREAD, &avail) < 0)
goto ioctl_failed;
GST_DEBUG_OBJECT (sink, "%s select reports client read of %d bytes",
mhclient->debug, avail);
ret = TRUE;
if (avail == 0) {
/* client sent close, so remove it */
GST_DEBUG_OBJECT (sink, "%s client asked for close, removing",
mhclient->debug);
mhclient->status = GST_CLIENT_STATUS_CLOSED;
ret = FALSE;
} else if (avail < 0) {
GST_WARNING_OBJECT (sink, "%s avail < 0, removing", mhclient->debug);
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, "%s client wants us to read %d bytes",
mhclient->debug, to_read);
nread = read (fd, dummy, to_read);
if (nread < -1) {
GST_WARNING_OBJECT (sink, "%s could not read %d bytes: %s (%d)",
mhclient->debug, to_read, g_strerror (errno), errno);
mhclient->status = GST_CLIENT_STATUS_ERROR;
ret = FALSE;
break;
} else if (nread == 0) {
GST_WARNING_OBJECT (sink, "%s 0 bytes in read, removing",
mhclient->debug);
mhclient->status = GST_CLIENT_STATUS_ERROR;
ret = FALSE;
break;
}
avail -= nread;
}
while (avail > 0);
}
return ret;
/* ERRORS */
ioctl_failed:
{
GST_WARNING_OBJECT (sink, "%s ioctl failed: %s (%d)",
mhclient->debug, g_strerror (errno), errno);
mhclient->status = GST_CLIENT_STATUS_ERROR;
return FALSE;
}
}
/* 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)
{
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;
int fd = mhclient->handle.fd;
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->gfd, 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_position (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->gfd, 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, "%s client %p at position %d",
mhclient->debug, 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);
if (!gst_buffer_map (head, &info, GST_MAP_READ))
g_return_val_if_reached (FALSE);
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 %s of %" G_GSSIZE_FORMAT " bytes",
mhclient->debug, 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, "%s flushed, removing", mhclient->debug);
mhclient->status = GST_CLIENT_STATUS_REMOVED;
return FALSE;
}
connection_reset:
{
GST_DEBUG_OBJECT (sink, "%s connection reset by peer, removing",
mhclient->debug);
mhclient->status = GST_CLIENT_STATUS_CLOSED;
return FALSE;
}
write_error:
{
GST_WARNING_OBJECT (sink,
"%s could not write, removing client: %s (%d)", mhclient->debug,
g_strerror (errno), errno);
mhclient->status = GST_CLIENT_STATUS_ERROR;
return FALSE;
}
}
static void
gst_multi_fd_sink_hash_adding (GstMultiHandleSink * mhsink,
GstMultiHandleClient * mhclient)
{
GstMultiFdSink *sink = GST_MULTI_FD_SINK (mhsink);
GstTCPClient *client = (GstTCPClient *) mhclient;
gst_poll_fd_ctl_write (sink->fdset, &client->gfd, TRUE);
}
static void
gst_multi_fd_sink_hash_removing (GstMultiHandleSink * mhsink,
GstMultiHandleClient * mhclient)
{
GstMultiFdSink *sink = GST_MULTI_FD_SINK (mhsink);
GstTCPClient *client = (GstTCPClient *) mhclient;
gst_poll_remove_fd (sink->fdset, &client->gfd);
}
/* 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);
int fd;
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 (mhsink);
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;
gst_multi_handle_sink_remove_client_link (mhsink, clients);
}
}
CLIENTS_UNLOCK (mhsink);
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 (mhsink);
restart:
cookie = mhsink->clients_cookie;
for (clients = mhsink->clients; clients; clients = next) {
GstTCPClient *client;
GstMultiHandleClient *mhclient;
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->gfd.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 */
gst_multi_handle_sink_remove_client_link (mhsink, clients);
}
}
}
CLIENTS_UNLOCK (mhsink);
/* 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 (mhsink);
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) {
gst_multi_handle_sink_remove_client_link (mhsink, clients);
continue;
}
if (gst_poll_fd_has_closed (sink->fdset, &client->gfd)) {
mhclient->status = GST_CLIENT_STATUS_CLOSED;
gst_multi_handle_sink_remove_client_link (mhsink, clients);
continue;
}
if (gst_poll_fd_has_error (sink->fdset, &client->gfd)) {
GST_WARNING_OBJECT (sink, "gst_poll_fd_has_error for %d", client->gfd.fd);
mhclient->status = GST_CLIENT_STATUS_ERROR;
gst_multi_handle_sink_remove_client_link (mhsink, clients);
continue;
}
if (gst_poll_fd_can_read (sink->fdset, &client->gfd)) {
/* handle client read */
if (!gst_multi_fd_sink_handle_client_read (sink, client)) {
gst_multi_handle_sink_remove_client_link (mhsink, clients);
continue;
}
}
if (gst_poll_fd_can_write (sink->fdset, &client->gfd)) {
/* handle client write */
if (!gst_multi_fd_sink_handle_client_write (sink, client)) {
gst_multi_handle_sink_remove_client_link (mhsink, clients);
continue;
}
}
}
CLIENTS_UNLOCK (mhsink);
}
/* 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_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_HANDLE_READ:
g_value_set_boolean (value, multifdsink->handle_read);
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");
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 (mhsink->handle_hash, multifdsink_hash_remove,
mfsink);
}
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