gstreamer/gst/tcp/gstmultisocketsink.c
William Manley e63e023e30 multisocketsink: Add support for GstNetControlMessageMeta
multisocketsink now understands the new GstNetControlMessageMeta to allow
sending control messages (ancillary data) with data when writing to Unix
domain sockets.

A later commit will introduce a new socketsrc element which will similarly
understand `GstNetControlMessageMeta`.  This, when used with a
`GSocketControlMessage` of type `GUnixFDMessage` will allow GStreamer to
send and receive file-descriptions in ancillary data, the first step to
using memfds to implement zero-copy video IPC.

Thanks to glib's `GSocketControlMessage` abstraction the code introduced
in this commit is entirely portable and doesn't introduce and additional
dependencies or conditionally compiled code, even if it is unlikely to be
of much use on non-UNIX systems.
2015-03-14 13:23:20 +01:00

1178 lines
40 KiB
C

/* 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>
* Copyright (C) <2011> Collabora Ltd.
* Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-multisocketsink
* @see_also: tcpserversink
*
* This plugin writes incoming data to a set of file descriptors. The
* file descriptors can be added to multisocketsink by emitting the #GstMultiSocketSink::add signal.
* For each descriptor added, the #GstMultiSocketSink::client-added signal will be called.
*
* A client can also be added with the #GstMultiSocketSink::add-full signal
* that allows for more control over what and how much data a client
* initially receives.
*
* Clients can be removed from multisocketsink by emitting the #GstMultiSocketSink::remove signal. For
* each descriptor removed, the #GstMultiSocketSink::client-removed signal will be called. The
* #GstMultiSocketSink::client-removed signal can also be fired when multisocketsink decides that a
* client is not active anymore or, depending on the value of the
* #GstMultiSocketSink:recover-policy property, if the client is reading too slowly.
* In all cases, multisocketsink will never close a file descriptor itself.
* The user of multisocketsink is responsible for closing all file descriptors.
* This can for example be done in response to the #GstMultiSocketSink::client-fd-removed signal.
* Note that multisocketsink still has a reference to the file descriptor when the
* #GstMultiSocketSink::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 #GstMultiSocketSink::client-removed signal handler, and you should use the
* #GstMultiSocketSink::client-fd-removed signal to safely close the fd.
*
* Multisocketsink 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 multisocketsink, the #GstMultiSocketSink: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
* multisocketsink (which can take some time depending on the keyframe rate), or the
* last received keyframe (which will cause a simple burst-on-connect).
* Multisocketsink will always keep at least one keyframe in its internal buffers
* when the sync-mode is set to latest-keyframe.
*
* There are additional values for the #GstMultiSocketSink: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.
*
* Multisocketsink can be instructed to keep at least a minimum amount of data
* expressed in time or byte units in its internal queues with the
* #GstMultiSocketSink:time-min and #GstMultiSocketSink:bytes-min properties respectively.
* These properties are useful if the application adds clients with the
* #GstMultiSocketSink::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 multisocketsink receives data. If the client is reading too
* fast, no data will be send to the client until multisocketsink receives more
* data. If the client, however, reads too slowly, data for that client will be
* queued up in multisocketsink. Two properties control the amount of data
* (buffers) that is queued in multisocketsink: #GstMultiSocketSink:buffers-max and
* #GstMultiSocketSink:buffers-soft-max. A client that falls behind by
* #GstMultiSocketSink:buffers-max is removed from multisocketsink forcibly.
*
* A client with a lag of at least #GstMultiSocketSink:buffers-soft-max enters the recovery
* procedure which is controlled with the #GstMultiSocketSink: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.
*
* multisocketsink 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. Multisocketsink will by default not do QoS and will never
* drop late buffers.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst-i18n-plugin.h>
#include <gst/net/gstnetcontrolmessagemeta.h>
#include <string.h>
#include "gstmultisocketsink.h"
#ifndef G_OS_WIN32
#include <netinet/in.h>
#endif
#define NOT_IMPLEMENTED 0
GST_DEBUG_CATEGORY_STATIC (multisocketsink_debug);
#define GST_CAT_DEFAULT (multisocketsink_debug)
/* MultiSocketSink 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_SOCKET_REMOVED,
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_LAST
};
static void gst_multi_socket_sink_finalize (GObject * object);
static void gst_multi_socket_sink_add (GstMultiSocketSink * sink,
GSocket * socket);
static void gst_multi_socket_sink_add_full (GstMultiSocketSink * sink,
GSocket * socket, GstSyncMethod sync, GstFormat min_format,
guint64 min_value, GstFormat max_format, guint64 max_value);
static void gst_multi_socket_sink_remove (GstMultiSocketSink * sink,
GSocket * socket);
static void gst_multi_socket_sink_remove_flush (GstMultiSocketSink * sink,
GSocket * socket);
static GstStructure *gst_multi_socket_sink_get_stats (GstMultiSocketSink * sink,
GSocket * socket);
static void gst_multi_socket_sink_emit_client_added (GstMultiHandleSink * mhs,
GstMultiSinkHandle handle);
static void gst_multi_socket_sink_emit_client_removed (GstMultiHandleSink * mhs,
GstMultiSinkHandle handle, GstClientStatus status);
static void gst_multi_socket_sink_stop_pre (GstMultiHandleSink * mhsink);
static void gst_multi_socket_sink_stop_post (GstMultiHandleSink * mhsink);
static gboolean gst_multi_socket_sink_start_pre (GstMultiHandleSink * mhsink);
static gpointer gst_multi_socket_sink_thread (GstMultiHandleSink * mhsink);
static GstMultiHandleClient
* gst_multi_socket_sink_new_client (GstMultiHandleSink * mhsink,
GstMultiSinkHandle handle, GstSyncMethod sync_method);
static int gst_multi_socket_sink_client_get_fd (GstMultiHandleClient * client);
static void gst_multi_socket_sink_client_free (GstMultiHandleSink * mhsink,
GstMultiHandleClient * client);
static void gst_multi_socket_sink_handle_debug (GstMultiSinkHandle handle,
gchar debug[30]);
static gpointer gst_multi_socket_sink_handle_hash_key (GstMultiSinkHandle
handle);
static void gst_multi_socket_sink_hash_adding (GstMultiHandleSink * mhsink,
GstMultiHandleClient * mhclient);
static void gst_multi_socket_sink_hash_removing (GstMultiHandleSink * mhsink,
GstMultiHandleClient * mhclient);
static gboolean gst_multi_socket_sink_socket_condition (GstMultiSinkHandle
handle, GIOCondition condition, GstMultiSocketSink * sink);
static gboolean gst_multi_socket_sink_unlock (GstBaseSink * bsink);
static gboolean gst_multi_socket_sink_unlock_stop (GstBaseSink * bsink);
static void gst_multi_socket_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_multi_socket_sink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
#define gst_multi_socket_sink_parent_class parent_class
G_DEFINE_TYPE (GstMultiSocketSink, gst_multi_socket_sink,
GST_TYPE_MULTI_HANDLE_SINK);
static guint gst_multi_socket_sink_signals[LAST_SIGNAL] = { 0 };
static void
gst_multi_socket_sink_class_init (GstMultiSocketSinkClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstBaseSinkClass *gstbasesink_class;
GstMultiHandleSinkClass *gstmultihandlesink_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstbasesink_class = (GstBaseSinkClass *) klass;
gstmultihandlesink_class = (GstMultiHandleSinkClass *) klass;
gobject_class->set_property = gst_multi_socket_sink_set_property;
gobject_class->get_property = gst_multi_socket_sink_get_property;
gobject_class->finalize = gst_multi_socket_sink_finalize;
/**
* GstMultiSocketSink::add:
* @gstmultisocketsink: the multisocketsink element to emit this signal on
* @socket: the socket to add to multisocketsink
*
* Hand the given open socket to multisocketsink to write to.
*/
gst_multi_socket_sink_signals[SIGNAL_ADD] =
g_signal_new ("add", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (GstMultiSocketSinkClass, add), NULL, NULL,
g_cclosure_marshal_generic, G_TYPE_NONE, 1, G_TYPE_SOCKET);
/**
* GstMultiSocketSink::add-full:
* @gstmultisocketsink: the multisocketsink element to emit this signal on
* @socket: the socket to add to multisocketsink
* @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 socket to multisocketsink to write to and
* specify the burst parameters for the new connection.
*/
gst_multi_socket_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 (GstMultiSocketSinkClass, add_full), NULL, NULL,
g_cclosure_marshal_generic, G_TYPE_NONE, 6,
G_TYPE_SOCKET, GST_TYPE_SYNC_METHOD, GST_TYPE_FORMAT, G_TYPE_UINT64,
GST_TYPE_FORMAT, G_TYPE_UINT64);
/**
* GstMultiSocketSink::remove:
* @gstmultisocketsink: the multisocketsink element to emit this signal on
* @socket: the socket to remove from multisocketsink
*
* Remove the given open socket from multisocketsink.
*/
gst_multi_socket_sink_signals[SIGNAL_REMOVE] =
g_signal_new ("remove", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (GstMultiSocketSinkClass, remove), NULL, NULL,
g_cclosure_marshal_generic, G_TYPE_NONE, 1, G_TYPE_SOCKET);
/**
* GstMultiSocketSink::remove-flush:
* @gstmultisocketsink: the multisocketsink element to emit this signal on
* @socket: the socket to remove from multisocketsink
*
* Remove the given open socket from multisocketsink after flushing all
* the pending data to the socket.
*/
gst_multi_socket_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 (GstMultiSocketSinkClass, remove_flush), NULL, NULL,
g_cclosure_marshal_generic, G_TYPE_NONE, 1, G_TYPE_SOCKET);
/**
* GstMultiSocketSink::get-stats:
* @gstmultisocketsink: the multisocketsink element to emit this signal on
* @socket: the socket to get stats of from multisocketsink
*
* Get statistics about @socket. This function returns a GstStructure.
*
* Returns: a GstStructure with the statistics. The structure contains
* values that represent: 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).
*/
gst_multi_socket_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 (GstMultiSocketSinkClass, get_stats), NULL, NULL,
g_cclosure_marshal_generic, GST_TYPE_STRUCTURE, 1, G_TYPE_SOCKET);
/**
* GstMultiSocketSink::client-added:
* @gstmultisocketsink: the multisocketsink element that emitted this signal
* @socket: the socket that was added to multisocketsink
*
* The given socket was added to multisocketsink. This signal will
* be emitted from the streaming thread so application should be prepared
* for that.
*/
gst_multi_socket_sink_signals[SIGNAL_CLIENT_ADDED] =
g_signal_new ("client-added", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, 0, NULL, NULL, g_cclosure_marshal_generic,
G_TYPE_NONE, 1, G_TYPE_OBJECT);
/**
* GstMultiSocketSink::client-removed:
* @gstmultisocketsink: the multisocketsink element that emitted this signal
* @socket: the socket that is to be removed from multisocketsink
* @status: the reason why the client was removed
*
* The given socket is about to be removed from multisocketsink. This
* signal will be emitted from the streaming thread so applications should
* be prepared for that.
*
* @gstmultisocketsink still holds a handle to @socket 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 @socket in this callback.
*/
gst_multi_socket_sink_signals[SIGNAL_CLIENT_REMOVED] =
g_signal_new ("client-removed", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, 0, NULL, NULL, g_cclosure_marshal_generic,
G_TYPE_NONE, 2, G_TYPE_INT, GST_TYPE_CLIENT_STATUS);
/**
* GstMultiSocketSink::client-socket-removed:
* @gstmultisocketsink: the multisocketsink element that emitted this signal
* @socket: the socket that was removed from multisocketsink
*
* The given socket was removed from multisocketsink. This signal will
* be emitted from the streaming thread so applications should be prepared
* for that.
*
* In this callback, @gstmultisocketsink has removed all the information
* associated with @socket and it is therefore not possible to call get-stats
* with @socket. It is however safe to close() and reuse @fd in the callback.
*/
gst_multi_socket_sink_signals[SIGNAL_CLIENT_SOCKET_REMOVED] =
g_signal_new ("client-socket-removed", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, 0, NULL, NULL, g_cclosure_marshal_generic,
G_TYPE_NONE, 1, G_TYPE_SOCKET);
gst_element_class_set_static_metadata (gstelement_class,
"Multi socket sink", "Sink/Network",
"Send data to multiple sockets",
"Thomas Vander Stichele <thomas at apestaart dot org>, "
"Wim Taymans <wim@fluendo.com>, "
"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
gstbasesink_class->unlock = GST_DEBUG_FUNCPTR (gst_multi_socket_sink_unlock);
gstbasesink_class->unlock_stop =
GST_DEBUG_FUNCPTR (gst_multi_socket_sink_unlock_stop);
klass->add = GST_DEBUG_FUNCPTR (gst_multi_socket_sink_add);
klass->add_full = GST_DEBUG_FUNCPTR (gst_multi_socket_sink_add_full);
klass->remove = GST_DEBUG_FUNCPTR (gst_multi_socket_sink_remove);
klass->remove_flush = GST_DEBUG_FUNCPTR (gst_multi_socket_sink_remove_flush);
klass->get_stats = GST_DEBUG_FUNCPTR (gst_multi_socket_sink_get_stats);
gstmultihandlesink_class->emit_client_added =
gst_multi_socket_sink_emit_client_added;
gstmultihandlesink_class->emit_client_removed =
gst_multi_socket_sink_emit_client_removed;
gstmultihandlesink_class->stop_pre =
GST_DEBUG_FUNCPTR (gst_multi_socket_sink_stop_pre);
gstmultihandlesink_class->stop_post =
GST_DEBUG_FUNCPTR (gst_multi_socket_sink_stop_post);
gstmultihandlesink_class->start_pre =
GST_DEBUG_FUNCPTR (gst_multi_socket_sink_start_pre);
gstmultihandlesink_class->thread =
GST_DEBUG_FUNCPTR (gst_multi_socket_sink_thread);
gstmultihandlesink_class->new_client =
GST_DEBUG_FUNCPTR (gst_multi_socket_sink_new_client);
gstmultihandlesink_class->client_get_fd =
GST_DEBUG_FUNCPTR (gst_multi_socket_sink_client_get_fd);
gstmultihandlesink_class->client_free =
GST_DEBUG_FUNCPTR (gst_multi_socket_sink_client_free);
gstmultihandlesink_class->handle_debug =
GST_DEBUG_FUNCPTR (gst_multi_socket_sink_handle_debug);
gstmultihandlesink_class->handle_hash_key =
GST_DEBUG_FUNCPTR (gst_multi_socket_sink_handle_hash_key);
gstmultihandlesink_class->hash_adding =
GST_DEBUG_FUNCPTR (gst_multi_socket_sink_hash_adding);
gstmultihandlesink_class->hash_removing =
GST_DEBUG_FUNCPTR (gst_multi_socket_sink_hash_removing);
GST_DEBUG_CATEGORY_INIT (multisocketsink_debug, "multisocketsink", 0,
"Multi socket sink");
}
static void
gst_multi_socket_sink_init (GstMultiSocketSink * this)
{
GstMultiHandleSink *mhsink = GST_MULTI_HANDLE_SINK (this);
mhsink->handle_hash = g_hash_table_new (g_direct_hash, g_int_equal);
this->cancellable = g_cancellable_new ();
}
static void
gst_multi_socket_sink_finalize (GObject * object)
{
GstMultiSocketSink *this = GST_MULTI_SOCKET_SINK (object);
if (this->cancellable) {
g_object_unref (this->cancellable);
this->cancellable = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
/* methods to emit signals */
static void
gst_multi_socket_sink_emit_client_added (GstMultiHandleSink * mhsink,
GstMultiSinkHandle handle)
{
g_signal_emit (mhsink, gst_multi_socket_sink_signals[SIGNAL_CLIENT_ADDED], 0,
handle.socket);
}
static void
gst_multi_socket_sink_emit_client_removed (GstMultiHandleSink * mhsink,
GstMultiSinkHandle handle, GstClientStatus status)
{
g_signal_emit (mhsink, gst_multi_socket_sink_signals[SIGNAL_CLIENT_REMOVED],
0, handle.socket, status);
}
/* action signals */
static void
gst_multi_socket_sink_add (GstMultiSocketSink * sink, GSocket * socket)
{
GstMultiSinkHandle handle;
handle.socket = socket;
gst_multi_handle_sink_add (GST_MULTI_HANDLE_SINK_CAST (sink), handle);
}
static void
gst_multi_socket_sink_add_full (GstMultiSocketSink * sink, GSocket * socket,
GstSyncMethod sync, GstFormat min_format, guint64 min_value,
GstFormat max_format, guint64 max_value)
{
GstMultiSinkHandle handle;
handle.socket = socket;
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_socket_sink_remove (GstMultiSocketSink * sink, GSocket * socket)
{
GstMultiSinkHandle handle;
handle.socket = socket;
gst_multi_handle_sink_remove (GST_MULTI_HANDLE_SINK_CAST (sink), handle);
}
static void
gst_multi_socket_sink_remove_flush (GstMultiSocketSink * sink, GSocket * socket)
{
GstMultiSinkHandle handle;
handle.socket = socket;
gst_multi_handle_sink_remove_flush (GST_MULTI_HANDLE_SINK_CAST (sink),
handle);
}
static GstStructure *
gst_multi_socket_sink_get_stats (GstMultiSocketSink * sink, GSocket * socket)
{
GstMultiSinkHandle handle;
handle.socket = socket;
return gst_multi_handle_sink_get_stats (GST_MULTI_HANDLE_SINK_CAST (sink),
handle);
}
static GstMultiHandleClient *
gst_multi_socket_sink_new_client (GstMultiHandleSink * mhsink,
GstMultiSinkHandle handle, GstSyncMethod sync_method)
{
GstSocketClient *client;
GstMultiHandleClient *mhclient;
GstMultiHandleSinkClass *mhsinkclass =
GST_MULTI_HANDLE_SINK_GET_CLASS (mhsink);
/* create client datastructure */
g_assert (G_IS_SOCKET (handle.socket));
client = g_new0 (GstSocketClient, 1);
mhclient = (GstMultiHandleClient *) client;
mhclient->handle.socket = G_SOCKET (g_object_ref (handle.socket));
gst_multi_handle_sink_client_init (mhclient, sync_method);
mhsinkclass->handle_debug (handle, mhclient->debug);
/* set the socket to non blocking */
g_socket_set_blocking (handle.socket, FALSE);
/* we always read from a client */
mhsinkclass->hash_adding (mhsink, mhclient);
gst_multi_handle_sink_setup_dscp_client (mhsink, mhclient);
return mhclient;
}
static int
gst_multi_socket_sink_client_get_fd (GstMultiHandleClient * client)
{
return g_socket_get_fd (client->handle.socket);
}
static void
gst_multi_socket_sink_client_free (GstMultiHandleSink * mhsink,
GstMultiHandleClient * client)
{
g_assert (G_IS_SOCKET (client->handle.socket));
g_signal_emit (mhsink,
gst_multi_socket_sink_signals[SIGNAL_CLIENT_SOCKET_REMOVED], 0,
client->handle.socket);
g_object_unref (client->handle.socket);
}
static void
gst_multi_socket_sink_handle_debug (GstMultiSinkHandle handle, gchar debug[30])
{
g_snprintf (debug, 30, "[socket %p]", handle.socket);
}
static gpointer
gst_multi_socket_sink_handle_hash_key (GstMultiSinkHandle handle)
{
return handle.socket;
}
/* handle a read on a client socket,
* which either indicates a close or should be ignored
* returns FALSE if some error occured or the client closed. */
static gboolean
gst_multi_socket_sink_handle_client_read (GstMultiSocketSink * sink,
GstSocketClient * client)
{
gboolean ret;
gchar dummy[256];
gssize nread;
GError *err = NULL;
gboolean first = TRUE;
GstMultiHandleClient *mhclient = (GstMultiHandleClient *) client;
GST_DEBUG_OBJECT (sink, "%s select reports client read", mhclient->debug);
ret = TRUE;
/* 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 {
gssize navail;
GST_DEBUG_OBJECT (sink, "%s client wants us to read", mhclient->debug);
navail = g_socket_get_available_bytes (mhclient->handle.socket);
if (navail < 0)
break;
nread =
g_socket_receive (mhclient->handle.socket, dummy, MIN (navail,
sizeof (dummy)), sink->cancellable, &err);
if (first && nread == 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 (nread < 0) {
GST_WARNING_OBJECT (sink, "%s could not read: %s",
mhclient->debug, err->message);
mhclient->status = GST_CLIENT_STATUS_ERROR;
ret = FALSE;
break;
}
first = FALSE;
} while (nread > 0);
g_clear_error (&err);
return ret;
}
/**
* map_memory_output_vector_n:
* @buf: The #GstBuffer that should be mapped
* @offset: Offset into the buffer that should be mapped
* @vectors: (out,array length=num_vectors): an array of #GOutputVector structs to write into
* @mapinfo: (out,array length=num_vectors): an array of #GstMapInfo structs to write into
* @num_vectors: the number of elements in @vectors to prevent buffer overruns
*
* Maps a buffer into memory, populating a #GOutputVector to use scatter-gather
* I/O to send the data over a socket. The whole buffer won't be mapped into
* memory if it consists of more than @num_vectors #GstMemory s.
*
* Use #unmap_n_memorys after you are
* finished with the mappings.
*
* Returns: The number of GstMemorys mapped
*/
static int
map_n_memory_output_vector (GstBuffer * buf, size_t offset,
GOutputVector * vectors, GstMapInfo * mapinfo, int num_vectors)
{
guint mem_idx, mem_len;
gsize mem_skip;
size_t maxsize;
int i;
g_return_val_if_fail (num_vectors > 0, 0);
memset (vectors, 0, sizeof (GOutputVector) * num_vectors);
maxsize = gst_buffer_get_size (buf) - offset;
if (!gst_buffer_find_memory (buf, offset, maxsize, &mem_idx, &mem_len,
&mem_skip))
g_error ("Unable to map memory at offset %" G_GSIZE_FORMAT ", buffer "
"length is %" G_GSIZE_FORMAT, offset, gst_buffer_get_size (buf));
for (i = 0; i < mem_len && i < num_vectors; i++) {
GstMapInfo map = { 0 };
GstMemory *mem = gst_buffer_peek_memory (buf, mem_idx + i);
if (!gst_memory_map (mem, &map, GST_MAP_READ))
g_error ("Unable to map memory %p. This should never happen.", mem);
if (i == 0) {
vectors[i].buffer = map.data + mem_skip;
vectors[i].size = map.size - mem_skip;
} else {
vectors[i].buffer = map.data;
vectors[i].size = map.size;
}
mapinfo[i] = map;
}
return i;
}
/**
* map_n_memory_output_vector:
* @buf: The #GstBuffer that should be mapped
* @offset: Offset into the buffer that should be mapped
* @vectors: (out,array length=num_vectors): an array of #GOutputVector structs to write into
* @num_vectors: the number of elements in @vectors to prevent buffer overruns
*
* Returns: The number of GstMemorys mapped
*/
static void
unmap_n_memorys (GstMapInfo * mapinfo, int num_mappings)
{
int i;
g_return_if_fail (num_mappings > 0);
for (i = 0; i < num_mappings; i++)
gst_memory_unmap (mapinfo[i].memory, &mapinfo[i]);
}
static gsize
gst_buffer_get_cmsg_list (GstBuffer * buf, GSocketControlMessage ** msgs,
gsize msg_space)
{
gpointer iter_state = NULL;
GstMeta *meta;
gsize msg_count = 0;
while ((meta = gst_buffer_iterate_meta (buf, &iter_state)) != NULL
&& msg_count < msg_space) {
if (meta->info->api == GST_NET_CONTROL_MESSAGE_META_API_TYPE)
msgs[msg_count++] = ((GstNetControlMessageMeta *) meta)->message;
}
return msg_count;
}
#define CMSG_MAX 255
static gssize
gst_multi_socket_sink_write (GstMultiSocketSink * sink,
GSocket * sock, GstBuffer * buffer, gsize bufoffset,
GCancellable * cancellable, GError ** err)
{
GstMapInfo maps[8];
GOutputVector vec[8];
guint mems_mapped;
gssize wrote;
GSocketControlMessage *cmsgs[CMSG_MAX];
gsize msg_count;
mems_mapped = map_n_memory_output_vector (buffer, bufoffset, vec, maps, 8);
msg_count = gst_buffer_get_cmsg_list (buffer, cmsgs, CMSG_MAX);
wrote =
g_socket_send_message (sock, NULL, vec, mems_mapped, cmsgs, msg_count, 0,
cancellable, err);
unmap_n_memorys (maps, mems_mapped);
return wrote;
}
/* 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_socket_sink_handle_client_write (GstMultiSocketSink * sink,
GstSocketClient * client)
{
gboolean more;
gboolean flushing;
GstClockTime now;
GTimeVal nowtv;
GError *err = NULL;
GstMultiHandleSink *mhsink = GST_MULTI_HANDLE_SINK (sink);
GstMultiHandleClient *mhclient = (GstMultiHandleClient *) client;
GstMultiHandleSinkClass *mhsinkclass =
GST_MULTI_HANDLE_SINK_GET_CLASS (mhsink);
g_get_current_time (&nowtv);
now = GST_TIMEVAL_TO_TIME (nowtv);
flushing = mhclient->status == GST_CLIENT_STATUS_FLUSHING;
more = TRUE;
do {
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 */
if (client->source) {
g_source_destroy (client->source);
g_source_unref (client->source);
client->source = NULL;
}
/* 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 */
if (client->source) {
g_source_destroy (client->source);
g_source_unref (client->source);
client->source = NULL;
}
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) {
gssize wrote;
GstBuffer *head;
/* pick first buffer from list */
head = GST_BUFFER (mhclient->sending->data);
wrote = gst_multi_socket_sink_write (sink, mhclient->handle.socket, head,
mhclient->bufoffset, sink->cancellable, &err);
if (wrote < 0) {
/* hmm error.. */
if (g_error_matches (err, G_IO_ERROR, G_IO_ERROR_CLOSED)) {
goto connection_reset;
} else if (g_error_matches (err, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK)) {
/* write would block, try again later */
GST_LOG_OBJECT (sink, "write would block %p",
mhclient->handle.socket);
more = FALSE;
} else {
goto write_error;
}
} else {
if (wrote < (gst_buffer_get_size (head) - mhclient->bufoffset)) {
/* partial write, try again now */
GST_LOG_OBJECT (sink,
"partial write on %p of %" G_GSSIZE_FORMAT " bytes",
mhclient->handle.socket, wrote);
mhclient->bufoffset += wrote;
} 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;
g_clear_error (&err);
return FALSE;
}
write_error:
{
GST_WARNING_OBJECT (sink,
"%s could not write, removing client: %s", mhclient->debug,
err->message);
g_clear_error (&err);
mhclient->status = GST_CLIENT_STATUS_ERROR;
return FALSE;
}
}
static void
gst_multi_socket_sink_hash_adding (GstMultiHandleSink * mhsink,
GstMultiHandleClient * mhclient)
{
GstMultiSocketSink *sink = GST_MULTI_SOCKET_SINK (mhsink);
GstSocketClient *client = (GstSocketClient *) (mhclient);
if (!sink->main_context)
return;
if (!client->source) {
client->source =
g_socket_create_source (mhclient->handle.socket,
G_IO_IN | G_IO_OUT | G_IO_PRI | G_IO_ERR | G_IO_HUP, sink->cancellable);
g_source_set_callback (client->source,
(GSourceFunc) gst_multi_socket_sink_socket_condition,
gst_object_ref (sink), (GDestroyNotify) gst_object_unref);
g_source_attach (client->source, sink->main_context);
}
}
static void
gst_multi_socket_sink_hash_removing (GstMultiHandleSink * mhsink,
GstMultiHandleClient * mhclient)
{
GstSocketClient *client = (GstSocketClient *) (mhclient);
if (client->source) {
g_source_destroy (client->source);
g_source_unref (client->source);
client->source = NULL;
}
}
/* Handle the clients. This is called when a socket becomes ready
* to read or writable. Badly behaving clients are put on a
* garbage list and removed.
*/
static gboolean
gst_multi_socket_sink_socket_condition (GstMultiSinkHandle handle,
GIOCondition condition, GstMultiSocketSink * sink)
{
GList *clink;
GstSocketClient *client;
gboolean ret = TRUE;
GstMultiHandleClient *mhclient;
GstMultiHandleSink *mhsink = GST_MULTI_HANDLE_SINK (sink);
GstMultiHandleSinkClass *mhsinkclass =
GST_MULTI_HANDLE_SINK_GET_CLASS (mhsink);
CLIENTS_LOCK (mhsink);
clink = g_hash_table_lookup (mhsink->handle_hash,
mhsinkclass->handle_hash_key (handle));
if (clink == NULL) {
ret = FALSE;
goto done;
}
client = clink->data;
mhclient = (GstMultiHandleClient *) client;
if (mhclient->status != GST_CLIENT_STATUS_FLUSHING
&& mhclient->status != GST_CLIENT_STATUS_OK) {
gst_multi_handle_sink_remove_client_link (mhsink, clink);
ret = FALSE;
goto done;
}
if ((condition & G_IO_ERR)) {
GST_WARNING_OBJECT (sink, "%s has error", mhclient->debug);
mhclient->status = GST_CLIENT_STATUS_ERROR;
gst_multi_handle_sink_remove_client_link (mhsink, clink);
ret = FALSE;
goto done;
} else if ((condition & G_IO_HUP)) {
mhclient->status = GST_CLIENT_STATUS_CLOSED;
gst_multi_handle_sink_remove_client_link (mhsink, clink);
ret = FALSE;
goto done;
} else if ((condition & G_IO_IN) || (condition & G_IO_PRI)) {
/* handle client read */
if (!gst_multi_socket_sink_handle_client_read (sink, client)) {
gst_multi_handle_sink_remove_client_link (mhsink, clink);
ret = FALSE;
goto done;
}
} else if ((condition & G_IO_OUT)) {
/* handle client write */
if (!gst_multi_socket_sink_handle_client_write (sink, client)) {
gst_multi_handle_sink_remove_client_link (mhsink, clink);
ret = FALSE;
goto done;
}
}
done:
CLIENTS_UNLOCK (mhsink);
return ret;
}
static gboolean
gst_multi_socket_sink_timeout (GstMultiSocketSink * sink)
{
GstClockTime now;
GTimeVal nowtv;
GList *clients;
GstMultiHandleSink *mhsink = GST_MULTI_HANDLE_SINK (sink);
g_get_current_time (&nowtv);
now = GST_TIMEVAL_TO_TIME (nowtv);
CLIENTS_LOCK (mhsink);
for (clients = mhsink->clients; clients; clients = clients->next) {
GstSocketClient *client;
GstMultiHandleClient *mhclient;
client = clients->data;
mhclient = (GstMultiHandleClient *) client;
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 FALSE;
}
/* 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_socket_sink_thread (GstMultiHandleSink * mhsink)
{
GstMultiSocketSink *sink = GST_MULTI_SOCKET_SINK (mhsink);
GSource *timeout = NULL;
while (mhsink->running) {
if (mhsink->timeout > 0) {
timeout = g_timeout_source_new (mhsink->timeout / GST_MSECOND);
g_source_set_callback (timeout,
(GSourceFunc) gst_multi_socket_sink_timeout, gst_object_ref (sink),
(GDestroyNotify) gst_object_unref);
g_source_attach (timeout, sink->main_context);
}
/* Returns after handling all pending events or when
* _wakeup() was called. In any case we have to add
* a new timeout because something happened.
*/
g_main_context_iteration (sink->main_context, TRUE);
if (timeout) {
g_source_destroy (timeout);
g_source_unref (timeout);
}
}
return NULL;
}
static void
gst_multi_socket_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_multi_socket_sink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_multi_socket_sink_start_pre (GstMultiHandleSink * mhsink)
{
GstMultiSocketSink *mssink = GST_MULTI_SOCKET_SINK (mhsink);
GstMultiHandleSinkClass *mhsinkclass =
GST_MULTI_HANDLE_SINK_GET_CLASS (mhsink);
GList *clients;
GST_INFO_OBJECT (mssink, "starting");
mssink->main_context = g_main_context_new ();
CLIENTS_LOCK (mhsink);
for (clients = mhsink->clients; clients; clients = clients->next) {
GstSocketClient *client = clients->data;
GstMultiHandleClient *mhclient = (GstMultiHandleClient *) client;
if (client->source)
continue;
mhsinkclass->hash_adding (mhsink, mhclient);
}
CLIENTS_UNLOCK (mhsink);
return TRUE;
}
static gboolean
multisocketsink_hash_remove (gpointer key, gpointer value, gpointer data)
{
return TRUE;
}
static void
gst_multi_socket_sink_stop_pre (GstMultiHandleSink * mhsink)
{
GstMultiSocketSink *mssink = GST_MULTI_SOCKET_SINK (mhsink);
if (mssink->main_context)
g_main_context_wakeup (mssink->main_context);
}
static void
gst_multi_socket_sink_stop_post (GstMultiHandleSink * mhsink)
{
GstMultiSocketSink *mssink = GST_MULTI_SOCKET_SINK (mhsink);
if (mssink->main_context) {
g_main_context_unref (mssink->main_context);
mssink->main_context = NULL;
}
g_hash_table_foreach_remove (mhsink->handle_hash, multisocketsink_hash_remove,
mssink);
}
static gboolean
gst_multi_socket_sink_unlock (GstBaseSink * bsink)
{
GstMultiSocketSink *sink;
sink = GST_MULTI_SOCKET_SINK (bsink);
GST_DEBUG_OBJECT (sink, "set to flushing");
g_cancellable_cancel (sink->cancellable);
if (sink->main_context)
g_main_context_wakeup (sink->main_context);
return TRUE;
}
/* will be called only between calls to start() and stop() */
static gboolean
gst_multi_socket_sink_unlock_stop (GstBaseSink * bsink)
{
GstMultiSocketSink *sink;
sink = GST_MULTI_SOCKET_SINK (bsink);
GST_DEBUG_OBJECT (sink, "unset flushing");
g_cancellable_reset (sink->cancellable);
return TRUE;
}