mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-09-08 13:18:52 +00:00
This provides notification that the socket in use was closed by the peer and gives an opportunity to replace it with a new one which is not closed, allowing reading from many sockets in order. I use this in pulsevideo to implement reconnection logic to handle the pulsevideo service dieing, such that is can be restarted without disrupting downstream. Fixes https://bugzilla.gnome.org/show_bug.cgi?id=739546
314 lines
9 KiB
C
314 lines
9 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) <2011> Collabora Ltd.
|
|
* Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>
|
|
* Copyright (C) <2014> William Manley <will@williammanley.net>
|
|
*
|
|
* 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-socketsrc
|
|
*
|
|
* Receive data from a socket.
|
|
*
|
|
* As compared to other elements:
|
|
*
|
|
* socketsrc can be considered a source counterpart to the #multisocketsink
|
|
* sink.
|
|
*
|
|
* socketsrc can also be considered a generalization of #tcpclientsrc and
|
|
* #tcpserversrc: it contains all the logic required to communicate over the
|
|
* socket but none of the logic for creating the sockets/establishing the
|
|
* connection in the first place, allowing the user to accomplish this
|
|
* externally in whatever manner they wish making it applicable to other types
|
|
* of sockets besides TCP.
|
|
*
|
|
* As compared to #fdsrc socketsrc is socket specific and deals with #GSocket
|
|
* objects rather than sockets via integer file-descriptors.
|
|
*
|
|
* @see_also: #multisocketsink
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <gst/gst-i18n-plugin.h>
|
|
#include "gstsocketsrc.h"
|
|
#include "gsttcp.h"
|
|
|
|
GST_DEBUG_CATEGORY_STATIC (socketsrc_debug);
|
|
#define GST_CAT_DEFAULT socketsrc_debug
|
|
|
|
#define MAX_READ_SIZE 4 * 1024
|
|
|
|
|
|
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
|
|
GST_PAD_SRC,
|
|
GST_PAD_ALWAYS,
|
|
GST_STATIC_CAPS_ANY);
|
|
|
|
|
|
enum
|
|
{
|
|
PROP_0,
|
|
PROP_SOCKET,
|
|
};
|
|
|
|
enum
|
|
{
|
|
CONNECTION_CLOSED_BY_PEER,
|
|
LAST_SIGNAL
|
|
};
|
|
|
|
static guint gst_socket_src_signals[LAST_SIGNAL] = { 0 };
|
|
|
|
#define gst_socket_src_parent_class parent_class
|
|
G_DEFINE_TYPE (GstSocketSrc, gst_socket_src, GST_TYPE_PUSH_SRC);
|
|
|
|
|
|
static void gst_socket_src_finalize (GObject * gobject);
|
|
|
|
static GstFlowReturn gst_socket_src_fill (GstPushSrc * psrc,
|
|
GstBuffer * outbuf);
|
|
static gboolean gst_socket_src_unlock (GstBaseSrc * bsrc);
|
|
static gboolean gst_socket_src_unlock_stop (GstBaseSrc * bsrc);
|
|
|
|
static void gst_socket_src_set_property (GObject * object, guint prop_id,
|
|
const GValue * value, GParamSpec * pspec);
|
|
static void gst_socket_src_get_property (GObject * object, guint prop_id,
|
|
GValue * value, GParamSpec * pspec);
|
|
|
|
#define SWAP(a, b) do { GSocket* _swap_tmp = a; a = b; b = _swap_tmp; } while (0);
|
|
|
|
static void
|
|
gst_socket_src_class_init (GstSocketSrcClass * klass)
|
|
{
|
|
GObjectClass *gobject_class;
|
|
GstElementClass *gstelement_class;
|
|
GstBaseSrcClass *gstbasesrc_class;
|
|
GstPushSrcClass *gstpush_src_class;
|
|
|
|
gobject_class = (GObjectClass *) klass;
|
|
gstelement_class = (GstElementClass *) klass;
|
|
gstbasesrc_class = (GstBaseSrcClass *) klass;
|
|
gstpush_src_class = (GstPushSrcClass *) klass;
|
|
|
|
gobject_class->set_property = gst_socket_src_set_property;
|
|
gobject_class->get_property = gst_socket_src_get_property;
|
|
gobject_class->finalize = gst_socket_src_finalize;
|
|
|
|
g_object_class_install_property (gobject_class, PROP_SOCKET,
|
|
g_param_spec_object ("socket", "Socket",
|
|
"The socket to receive packets from", G_TYPE_SOCKET,
|
|
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
|
|
|
|
gst_socket_src_signals[CONNECTION_CLOSED_BY_PEER] =
|
|
g_signal_new ("connection-closed-by-peer", G_TYPE_FROM_CLASS (klass),
|
|
G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (GstSocketSrcClass,
|
|
connection_closed_by_peer), NULL, NULL, NULL, G_TYPE_NONE, 0);
|
|
|
|
gst_element_class_add_pad_template (gstelement_class,
|
|
gst_static_pad_template_get (&srctemplate));
|
|
|
|
gst_element_class_set_static_metadata (gstelement_class,
|
|
"socket source", "Source/Network",
|
|
"Receive data from a socket",
|
|
"Thomas Vander Stichele <thomas at apestaart dot org>, "
|
|
"William Manley <will@williammanley.net>");
|
|
|
|
gstbasesrc_class->unlock = gst_socket_src_unlock;
|
|
gstbasesrc_class->unlock_stop = gst_socket_src_unlock_stop;
|
|
|
|
gstpush_src_class->fill = gst_socket_src_fill;
|
|
|
|
GST_DEBUG_CATEGORY_INIT (socketsrc_debug, "socketsrc", 0, "Socket Source");
|
|
}
|
|
|
|
static void
|
|
gst_socket_src_init (GstSocketSrc * this)
|
|
{
|
|
this->socket = NULL;
|
|
this->cancellable = g_cancellable_new ();
|
|
}
|
|
|
|
static void
|
|
gst_socket_src_finalize (GObject * gobject)
|
|
{
|
|
GstSocketSrc *this = GST_SOCKET_SRC (gobject);
|
|
|
|
g_clear_object (&this->cancellable);
|
|
g_clear_object (&this->socket);
|
|
|
|
G_OBJECT_CLASS (parent_class)->finalize (gobject);
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_socket_src_fill (GstPushSrc * psrc, GstBuffer * outbuf)
|
|
{
|
|
GstSocketSrc *src;
|
|
GstFlowReturn ret = GST_FLOW_OK;
|
|
gssize rret;
|
|
GError *err = NULL;
|
|
GstMapInfo map;
|
|
GSocket *socket = NULL;
|
|
|
|
src = GST_SOCKET_SRC (psrc);
|
|
|
|
GST_OBJECT_LOCK (src);
|
|
|
|
if (src->socket)
|
|
socket = g_object_ref (src->socket);
|
|
|
|
GST_OBJECT_UNLOCK (src);
|
|
|
|
if (socket == NULL)
|
|
goto no_socket;
|
|
|
|
GST_LOG_OBJECT (src, "asked for a buffer");
|
|
|
|
retry:
|
|
gst_buffer_map (outbuf, &map, GST_MAP_READWRITE);
|
|
rret = g_socket_receive_with_blocking (socket, (gchar *) map.data,
|
|
map.size, TRUE, src->cancellable, &err);
|
|
gst_buffer_unmap (outbuf, &map);
|
|
|
|
if (rret == 0) {
|
|
GSocket *tmp = NULL;
|
|
GST_DEBUG_OBJECT (src, "Received EOS on socket %p fd %i", socket,
|
|
g_socket_get_fd (socket));
|
|
|
|
/* We've hit EOS but we'll send this signal to allow someone to change
|
|
* our socket before we send EOS downstream. */
|
|
g_signal_emit (src, gst_socket_src_signals[CONNECTION_CLOSED_BY_PEER], 0);
|
|
|
|
GST_OBJECT_LOCK (src);
|
|
|
|
if (src->socket)
|
|
tmp = g_object_ref (src->socket);
|
|
|
|
GST_OBJECT_UNLOCK (src);
|
|
|
|
/* Do this dance with tmp to avoid unreffing with the lock held */
|
|
if (tmp != NULL && tmp != socket) {
|
|
SWAP (socket, tmp);
|
|
g_clear_object (&tmp);
|
|
|
|
GST_INFO_OBJECT (src, "New socket available after EOS %p fd %i: Retrying",
|
|
socket, g_socket_get_fd (socket));
|
|
|
|
/* retry with our new socket: */
|
|
goto retry;
|
|
} else {
|
|
g_clear_object (&tmp);
|
|
GST_INFO_OBJECT (src, "Forwarding EOS downstream");
|
|
ret = GST_FLOW_EOS;
|
|
}
|
|
} else if (rret < 0) {
|
|
if (g_error_matches (err, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
|
|
ret = GST_FLOW_FLUSHING;
|
|
GST_DEBUG_OBJECT (src, "Cancelled reading from socket");
|
|
} else {
|
|
ret = GST_FLOW_ERROR;
|
|
GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
|
|
("Failed to read from socket: %s", err->message));
|
|
}
|
|
} else {
|
|
ret = GST_FLOW_OK;
|
|
gst_buffer_resize (outbuf, 0, rret);
|
|
|
|
GST_LOG_OBJECT (src,
|
|
"Returning buffer from _get of size %" G_GSIZE_FORMAT ", ts %"
|
|
GST_TIME_FORMAT ", dur %" GST_TIME_FORMAT
|
|
", offset %" G_GINT64_FORMAT ", offset_end %" G_GINT64_FORMAT,
|
|
gst_buffer_get_size (outbuf),
|
|
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)),
|
|
GST_TIME_ARGS (GST_BUFFER_DURATION (outbuf)),
|
|
GST_BUFFER_OFFSET (outbuf), GST_BUFFER_OFFSET_END (outbuf));
|
|
}
|
|
g_clear_error (&err);
|
|
g_clear_object (&socket);
|
|
|
|
return ret;
|
|
|
|
no_socket:
|
|
{
|
|
GST_ELEMENT_ERROR (src, RESOURCE, NOT_FOUND, (NULL),
|
|
("Cannot receive: No socket set on socketsrc"));
|
|
return GST_FLOW_ERROR;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_socket_src_set_property (GObject * object, guint prop_id,
|
|
const GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstSocketSrc *socketsrc = GST_SOCKET_SRC (object);
|
|
|
|
switch (prop_id) {
|
|
case PROP_SOCKET:{
|
|
GSocket *socket = G_SOCKET (g_value_dup_object (value));
|
|
GST_OBJECT_LOCK (socketsrc);
|
|
SWAP (socket, socketsrc->socket);
|
|
GST_OBJECT_UNLOCK (socketsrc);
|
|
g_clear_object (&socket);
|
|
break;
|
|
}
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_socket_src_get_property (GObject * object, guint prop_id,
|
|
GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstSocketSrc *socketsrc = GST_SOCKET_SRC (object);
|
|
|
|
switch (prop_id) {
|
|
case PROP_SOCKET:
|
|
g_value_set_object (value, socketsrc->socket);
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static gboolean
|
|
gst_socket_src_unlock (GstBaseSrc * bsrc)
|
|
{
|
|
GstSocketSrc *src = GST_SOCKET_SRC (bsrc);
|
|
|
|
GST_DEBUG_OBJECT (src, "set to flushing");
|
|
g_cancellable_cancel (src->cancellable);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
gst_socket_src_unlock_stop (GstBaseSrc * bsrc)
|
|
{
|
|
GstSocketSrc *src = GST_SOCKET_SRC (bsrc);
|
|
|
|
GST_DEBUG_OBJECT (src, "unset flushing");
|
|
g_cancellable_reset (src->cancellable);
|
|
|
|
return TRUE;
|
|
}
|