gstreamer/gst/tcp/gstsocketsrc.c
2021-03-16 17:58:59 +00:00

479 lines
14 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
* @title: 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 <gst/net/gstnetcontrolmessagemeta.h>
#include "gsttcpelements.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);
#define DEFAULT_SEND_MESSAGES FALSE
enum
{
PROP_0,
PROP_SOCKET,
PROP_CAPS,
PROP_SEND_MESSAGES
};
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);
GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (socketsrc, "socketsrc",
GST_RANK_NONE, GST_TYPE_SOCKET_SRC, tcp_element_init (plugin));
static void gst_socket_src_finalize (GObject * gobject);
static GstCaps *gst_socketsrc_getcaps (GstBaseSrc * src, GstCaps * filter);
static gboolean gst_socketsrc_event (GstBaseSrc * src, GstEvent * event);
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));
g_object_class_install_property (gobject_class, PROP_CAPS,
g_param_spec_boxed ("caps", "Caps",
"The caps of the source pad", GST_TYPE_CAPS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstSocketSrc:send-messages:
*
* Control if the source will handle GstNetworkMessage events.
* The event is a CUSTOM event named 'GstNetworkMessage' and contains:
*
* "buffer", GST_TYPE_BUFFER : the buffer with data to send
*
* The buffer in the event will be sent on the socket. This allows
* for simple bidirectional communication.
*
* Since: 1.8.0
**/
g_object_class_install_property (gobject_class, PROP_SEND_MESSAGES,
g_param_spec_boolean ("send-messages", "Send Messages",
"If GstNetworkMessage events should be handled",
DEFAULT_SEND_MESSAGES, 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_static_pad_template (gstelement_class, &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->event = gst_socketsrc_event;
gstbasesrc_class->get_caps = gst_socketsrc_getcaps;
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 ();
this->send_messages = DEFAULT_SEND_MESSAGES;
}
static void
gst_socket_src_finalize (GObject * gobject)
{
GstSocketSrc *this = GST_SOCKET_SRC (gobject);
if (this->caps)
gst_caps_unref (this->caps);
g_clear_object (&this->cancellable);
g_clear_object (&this->socket);
G_OBJECT_CLASS (parent_class)->finalize (gobject);
}
static gboolean
gst_socketsrc_event (GstBaseSrc * bsrc, GstEvent * event)
{
GstSocketSrc *src;
gboolean res = FALSE;
src = GST_SOCKET_SRC (bsrc);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CUSTOM_UPSTREAM:
if (src->send_messages && gst_event_has_name (event, "GstNetworkMessage")) {
const GstStructure *str = gst_event_get_structure (event);
GSocket *socket;
GST_OBJECT_LOCK (src);
if ((socket = src->socket))
g_object_ref (socket);
GST_OBJECT_UNLOCK (src);
if (socket) {
GstBuffer *buf;
GstMapInfo map;
GError *err = NULL;
gssize ret;
gst_structure_get (str, "buffer", GST_TYPE_BUFFER, &buf, NULL);
if (buf) {
gst_buffer_map (buf, &map, GST_MAP_READ);
GST_LOG ("sending buffer of size %" G_GSIZE_FORMAT, map.size);
ret = g_socket_send_with_blocking (socket, (gchar *) map.data,
map.size, FALSE, src->cancellable, &err);
gst_buffer_unmap (buf, &map);
if (ret == -1) {
GST_WARNING ("could not send message: %s", err->message);
g_clear_error (&err);
res = FALSE;
} else
res = TRUE;
gst_buffer_unref (buf);
}
g_object_unref (socket);
}
}
break;
default:
res = GST_BASE_SRC_CLASS (parent_class)->event (bsrc, event);
break;
}
return res;
}
static GstCaps *
gst_socketsrc_getcaps (GstBaseSrc * src, GstCaps * filter)
{
GstSocketSrc *socketsrc;
GstCaps *caps, *result;
socketsrc = GST_SOCKET_SRC (src);
GST_OBJECT_LOCK (src);
if ((caps = socketsrc->caps))
gst_caps_ref (caps);
GST_OBJECT_UNLOCK (src);
if (caps) {
if (filter) {
result = gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (caps);
} else {
result = caps;
}
} else {
result = (filter) ? gst_caps_ref (filter) : gst_caps_new_any ();
}
return result;
}
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;
GSocketControlMessage **messages = NULL;
gint num_messages = 0;
gint i;
GInputVector ivec;
gint flags = 0;
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);
ivec.buffer = map.data;
ivec.size = map.size;
rret =
g_socket_receive_message (socket, NULL, &ivec, 1, &messages,
&num_messages, &flags, src->cancellable, &err);
gst_buffer_unmap (outbuf, &map);
for (i = 0; i < num_messages; i++) {
gst_buffer_add_net_control_message_meta (outbuf, messages[i]);
g_object_unref (messages[i]);
messages[i] = NULL;
}
g_free (messages);
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;
}
case PROP_CAPS:
{
const GstCaps *new_caps_val = gst_value_get_caps (value);
GstCaps *new_caps;
GstCaps *old_caps;
if (new_caps_val == NULL) {
new_caps = gst_caps_new_any ();
} else {
new_caps = gst_caps_copy (new_caps_val);
}
GST_OBJECT_LOCK (socketsrc);
old_caps = socketsrc->caps;
socketsrc->caps = new_caps;
GST_OBJECT_UNLOCK (socketsrc);
if (old_caps)
gst_caps_unref (old_caps);
gst_pad_mark_reconfigure (GST_BASE_SRC_PAD (socketsrc));
break;
}
case PROP_SEND_MESSAGES:
socketsrc->send_messages = g_value_get_boolean (value);
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;
case PROP_CAPS:
GST_OBJECT_LOCK (socketsrc);
gst_value_set_caps (value, socketsrc->caps);
GST_OBJECT_UNLOCK (socketsrc);
break;
case PROP_SEND_MESSAGES:
g_value_set_boolean (value, socketsrc->send_messages);
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;
}