gstreamer/ext/srt/gstsrtserversink.c

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/* GStreamer SRT plugin based on libsrt
* Copyright (C) 2017, Collabora Ltd.
* Author:Justin Kim <justin.kim@collabora.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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-srtserversink
* @title: srtserversink
*
* srtserversink is a network sink that sends <ulink url="http://www.srtalliance.org/">SRT</ulink>
* packets to the network. Although SRT is an UDP-based protocol, srtserversink works like
* a server socket of connection-oriented protocol.
*
* <refsect2>
* <title>Examples</title>
* |[
* gst-launch-1.0 -v audiotestsrc ! srtserversink
* ]| This pipeline shows how to serve SRT packets through the default port.
* </refsect2>
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstsrtserversink.h"
#include "gstsrt.h"
#include <srt/srt.h>
#include <gio/gio.h>
#define SRT_DEFAULT_POLL_TIMEOUT -1
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
#define GST_CAT_DEFAULT gst_debug_srt_server_sink
GST_DEBUG_CATEGORY (GST_CAT_DEFAULT);
struct _GstSRTServerSinkPrivate
{
gboolean cancelled;
SRTSOCKET sock;
gint poll_id;
gint poll_timeout;
GMainLoop *loop;
GMainContext *context;
GSource *server_source;
GThread *thread;
GList *clients;
};
#define GST_SRT_SERVER_SINK_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_SRT_SERVER_SINK, GstSRTServerSinkPrivate))
enum
{
PROP_POLL_TIMEOUT = 1,
PROP_STATS,
/*< private > */
PROP_LAST
};
static GParamSpec *properties[PROP_LAST];
enum
{
SIG_CLIENT_ADDED,
SIG_CLIENT_REMOVED,
LAST_SIGNAL
};
static guint signals[LAST_SIGNAL] = { 0 };
#define gst_srt_server_sink_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstSRTServerSink, gst_srt_server_sink,
GST_TYPE_SRT_BASE_SINK, G_ADD_PRIVATE (GstSRTServerSink)
GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "srtserversink", 0,
"SRT Server Sink"));
typedef struct
{
int sock;
GSocketAddress *sockaddr;
gboolean sent_headers;
} SRTClient;
static SRTClient *
srt_client_new (void)
{
SRTClient *client = g_new0 (SRTClient, 1);
client->sock = SRT_INVALID_SOCK;
return client;
}
static void
srt_client_free (SRTClient * client)
{
g_return_if_fail (client != NULL);
g_clear_object (&client->sockaddr);
if (client->sock != SRT_INVALID_SOCK) {
srt_close (client->sock);
}
g_free (client);
}
static void
srt_emit_client_removed (SRTClient * client, gpointer user_data)
{
GstSRTServerSink *self = GST_SRT_SERVER_SINK (user_data);
g_return_if_fail (client != NULL && GST_IS_SRT_SERVER_SINK (self));
g_signal_emit (self, signals[SIG_CLIENT_REMOVED], 0, client->sock,
client->sockaddr);
}
static void
gst_srt_server_sink_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstSRTServerSink *self = GST_SRT_SERVER_SINK (object);
GstSRTServerSinkPrivate *priv = GST_SRT_SERVER_SINK_GET_PRIVATE (self);
switch (prop_id) {
case PROP_POLL_TIMEOUT:
g_value_set_int (value, priv->poll_timeout);
break;
case PROP_STATS:
{
GList *item;
GST_OBJECT_LOCK (self);
for (item = priv->clients; item; item = item->next) {
SRTClient *client = item->data;
GValue tmp = G_VALUE_INIT;
g_value_init (&tmp, GST_TYPE_STRUCTURE);
g_value_take_boxed (&tmp, gst_srt_base_sink_get_stats (client->sockaddr,
client->sock));
gst_value_array_append_and_take_value (value, &tmp);
}
GST_OBJECT_UNLOCK (self);
break;
}
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_srt_server_sink_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstSRTServerSink *self = GST_SRT_SERVER_SINK (object);
GstSRTServerSinkPrivate *priv = GST_SRT_SERVER_SINK_GET_PRIVATE (self);
switch (prop_id) {
case PROP_POLL_TIMEOUT:
priv->poll_timeout = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
idle_listen_callback (gpointer data)
{
GstSRTServerSink *self = GST_SRT_SERVER_SINK (data);
GstSRTServerSinkPrivate *priv = GST_SRT_SERVER_SINK_GET_PRIVATE (self);
gboolean ret = TRUE;
SRTClient *client;
SRTSOCKET ready[2];
struct sockaddr sa;
int sa_len;
if (srt_epoll_wait (priv->poll_id, ready, &(int) {
2}, 0, 0, priv->poll_timeout, 0, 0, 0, 0) == -1) {
int srt_errno = srt_getlasterror (NULL);
if (srt_errno != SRT_ETIMEOUT) {
GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
("SRT error: %s", srt_getlasterror_str ()), (NULL));
ret = FALSE;
goto out;
}
/* Mimicking cancellable */
if (srt_errno == SRT_ETIMEOUT && priv->cancelled) {
GST_DEBUG_OBJECT (self, "Cancelled waiting for client");
ret = FALSE;
goto out;
}
}
client = srt_client_new ();
client->sock = srt_accept (priv->sock, &sa, &sa_len);
if (client->sock == SRT_INVALID_SOCK) {
GST_WARNING_OBJECT (self, "detected invalid SRT client socket (reason: %s)",
srt_getlasterror_str ());
srt_clearlasterror ();
srt_client_free (client);
ret = FALSE;
goto out;
}
client->sockaddr = g_socket_address_new_from_native (&sa, sa_len);
GST_OBJECT_LOCK (self);
priv->clients = g_list_append (priv->clients, client);
GST_OBJECT_UNLOCK (self);
g_signal_emit (self, signals[SIG_CLIENT_ADDED], 0, client->sock,
client->sockaddr);
GST_DEBUG_OBJECT (self, "client added");
out:
return ret;
}
static gpointer
thread_func (gpointer data)
{
GstSRTServerSink *self = GST_SRT_SERVER_SINK (data);
GstSRTServerSinkPrivate *priv = GST_SRT_SERVER_SINK_GET_PRIVATE (self);
g_main_loop_run (priv->loop);
return NULL;
}
static gboolean
gst_srt_server_sink_start (GstBaseSink * sink)
{
GstSRTServerSink *self = GST_SRT_SERVER_SINK (sink);
GstSRTServerSinkPrivate *priv = GST_SRT_SERVER_SINK_GET_PRIVATE (self);
GstSRTBaseSink *base = GST_SRT_BASE_SINK (sink);
GstUri *uri = gst_uri_ref (GST_SRT_BASE_SINK (self)->uri);
GSocketAddress *socket_address = NULL;
GError *error = NULL;
gboolean ret = TRUE;
struct sockaddr sa;
size_t sa_len;
const gchar *host;
int lat = base->latency;
if (gst_uri_get_port (uri) == GST_URI_NO_PORT) {
GST_ELEMENT_ERROR (sink, RESOURCE, OPEN_WRITE, NULL, (("Invalid port")));
return FALSE;
}
host = gst_uri_get_host (uri);
if (host == NULL) {
GInetAddress *any = g_inet_address_new_any (G_SOCKET_FAMILY_IPV4);
socket_address = g_inet_socket_address_new (any, gst_uri_get_port (uri));
g_object_unref (any);
} else {
socket_address =
g_inet_socket_address_new_from_string (host, gst_uri_get_port (uri));
}
if (socket_address == NULL) {
GST_WARNING_OBJECT (self,
"failed to extract host or port from the given URI");
goto failed;
}
sa_len = g_socket_address_get_native_size (socket_address);
if (!g_socket_address_to_native (socket_address, &sa, sa_len, &error)) {
GST_WARNING_OBJECT (self, "cannot resolve address (reason: %s)",
error->message);
goto failed;
}
priv->sock = srt_socket (sa.sa_family, SOCK_DGRAM, 0);
if (priv->sock == SRT_INVALID_SOCK) {
GST_WARNING_OBJECT (self, "failed to create SRT socket (reason: %s)",
srt_getlasterror_str ());
goto failed;
}
/* Make SRT non-blocking */
srt_setsockopt (priv->sock, 0, SRTO_SNDSYN, &(int) {
0}, sizeof (int));
/* Make sure TSBPD mode is enable (SRT mode) */
srt_setsockopt (priv->sock, 0, SRTO_TSBPDMODE, &(int) {
1}, sizeof (int));
/* This is a sink, we're always a sender */
srt_setsockopt (priv->sock, 0, SRTO_SENDER, &(int) {
1}, sizeof (int));
srt_setsockopt (priv->sock, 0, SRTO_TSBPDDELAY, &lat, sizeof (int));
if (base->passphrase != NULL && base->passphrase[0] != '\0') {
srt_setsockopt (priv->sock, 0, SRTO_PASSPHRASE,
base->passphrase, strlen (base->passphrase));
srt_setsockopt (priv->sock, 0, SRTO_PBKEYLEN,
&base->key_length, sizeof (int));
}
priv->poll_id = srt_epoll_create ();
if (priv->poll_id == -1) {
GST_WARNING_OBJECT (self,
"failed to create poll id for SRT socket (reason: %s)",
srt_getlasterror_str ());
goto failed;
}
srt_epoll_add_usock (priv->poll_id, priv->sock, &(int) {
SRT_EPOLL_IN});
if (srt_bind (priv->sock, &sa, sa_len) == SRT_ERROR) {
GST_WARNING_OBJECT (self, "failed to bind SRT server socket (reason: %s)",
srt_getlasterror_str ());
goto failed;
}
if (srt_listen (priv->sock, 1) == SRT_ERROR) {
GST_WARNING_OBJECT (self, "failed to listen SRT socket (reason: %s)",
srt_getlasterror_str ());
goto failed;
}
priv->context = g_main_context_new ();
priv->server_source = g_idle_source_new ();
g_source_set_callback (priv->server_source,
(GSourceFunc) idle_listen_callback, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
g_source_attach (priv->server_source, priv->context);
priv->loop = g_main_loop_new (priv->context, TRUE);
priv->thread = g_thread_try_new ("srtserversink", thread_func, self, &error);
if (error != NULL) {
GST_WARNING_OBJECT (self, "failed to create thread (reason: %s)",
error->message);
ret = FALSE;
}
g_clear_pointer (&uri, gst_uri_unref);
g_clear_object (&socket_address);
return ret;
failed:
if (priv->poll_id != SRT_ERROR) {
srt_epoll_release (priv->poll_id);
priv->poll_id = SRT_ERROR;
}
if (priv->sock != SRT_INVALID_SOCK) {
srt_close (priv->sock);
priv->sock = SRT_INVALID_SOCK;
}
g_clear_error (&error);
g_clear_pointer (&uri, gst_uri_unref);
g_clear_object (&socket_address);
return FALSE;
}
static gboolean
send_buffer_internal (GstSRTBaseSink * sink,
const GstMapInfo * mapinfo, gpointer user_data)
{
SRTClient *client = user_data;
if (srt_sendmsg2 (client->sock, (char *) mapinfo->data, mapinfo->size,
0) == SRT_ERROR) {
GST_WARNING_OBJECT (sink, "%s", srt_getlasterror_str ());
return FALSE;
}
return TRUE;
}
static gboolean
gst_srt_server_sink_send_buffer (GstSRTBaseSink * sink,
const GstMapInfo * mapinfo)
{
GstSRTServerSink *self = GST_SRT_SERVER_SINK (sink);
GstSRTServerSinkPrivate *priv = GST_SRT_SERVER_SINK_GET_PRIVATE (self);
GList *clients = priv->clients;
GST_OBJECT_LOCK (sink);
while (clients != NULL) {
SRTClient *client = clients->data;
clients = clients->next;
if (!client->sent_headers) {
if (!gst_srt_base_sink_send_headers (sink, send_buffer_internal, client))
goto err;
client->sent_headers = TRUE;
}
if (!send_buffer_internal (sink, mapinfo, client))
goto err;
continue;
err:
priv->clients = g_list_remove (priv->clients, client);
GST_OBJECT_UNLOCK (sink);
g_signal_emit (self, signals[SIG_CLIENT_REMOVED], 0, client->sock,
client->sockaddr);
srt_client_free (client);
GST_OBJECT_LOCK (sink);
}
GST_OBJECT_UNLOCK (sink);
return TRUE;
}
static gboolean
gst_srt_server_sink_stop (GstBaseSink * sink)
{
GstSRTServerSink *self = GST_SRT_SERVER_SINK (sink);
GstSRTServerSinkPrivate *priv = GST_SRT_SERVER_SINK_GET_PRIVATE (self);
GList *clients;
GST_DEBUG_OBJECT (self, "closing client sockets");
GST_OBJECT_LOCK (sink);
clients = priv->clients;
priv->clients = NULL;
GST_OBJECT_UNLOCK (sink);
g_list_foreach (clients, (GFunc) srt_emit_client_removed, self);
g_list_free_full (clients, (GDestroyNotify) srt_client_free);
GST_DEBUG_OBJECT (self, "closing SRT connection");
srt_epoll_remove_usock (priv->poll_id, priv->sock);
srt_epoll_release (priv->poll_id);
srt_close (priv->sock);
if (priv->loop) {
g_main_loop_quit (priv->loop);
g_thread_join (priv->thread);
g_clear_pointer (&priv->loop, g_main_loop_unref);
g_clear_pointer (&priv->thread, g_thread_unref);
}
if (priv->server_source) {
g_source_destroy (priv->server_source);
g_clear_pointer (&priv->server_source, g_source_unref);
}
g_clear_pointer (&priv->context, g_main_context_unref);
return GST_BASE_SINK_CLASS (parent_class)->stop (sink);
}
static gboolean
gst_srt_server_sink_unlock (GstBaseSink * sink)
{
GstSRTServerSink *self = GST_SRT_SERVER_SINK (sink);
GstSRTServerSinkPrivate *priv = GST_SRT_SERVER_SINK_GET_PRIVATE (self);
priv->cancelled = TRUE;
return TRUE;
}
static gboolean
gst_srt_server_sink_unlock_stop (GstBaseSink * sink)
{
GstSRTServerSink *self = GST_SRT_SERVER_SINK (sink);
GstSRTServerSinkPrivate *priv = GST_SRT_SERVER_SINK_GET_PRIVATE (self);
priv->cancelled = FALSE;
return TRUE;
}
static void
gst_srt_server_sink_class_init (GstSRTServerSinkClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
GstBaseSinkClass *gstbasesink_class = GST_BASE_SINK_CLASS (klass);
GstSRTBaseSinkClass *gstsrtbasesink_class = GST_SRT_BASE_SINK_CLASS (klass);
gobject_class->set_property = gst_srt_server_sink_set_property;
gobject_class->get_property = gst_srt_server_sink_get_property;
properties[PROP_POLL_TIMEOUT] =
g_param_spec_int ("poll-timeout", "Poll Timeout",
"Return poll wait after timeout miliseconds (-1 = infinite)", -1,
G_MAXINT32, SRT_DEFAULT_POLL_TIMEOUT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
properties[PROP_STATS] = gst_param_spec_array ("stats", "Statistics",
"Array of GstStructures containing SRT statistics",
g_param_spec_boxed ("stats", "Statistics",
"Statistics for one client", GST_TYPE_STRUCTURE,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS),
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
g_object_class_install_properties (gobject_class, PROP_LAST, properties);
/**
* GstSRTServerSink::client-added:
* @gstsrtserversink: the srtserversink element that emitted this signal
* @sock: the client socket descriptor that was added to srtserversink
* @addr: the pointer of "struct sockaddr" that describes the @sock
* @addr_len: the length of @addr
*
* The given socket descriptor was added to srtserversink.
*/
signals[SIG_CLIENT_ADDED] =
g_signal_new ("client-added", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstSRTServerSinkClass, client_added),
NULL, NULL, g_cclosure_marshal_generic, G_TYPE_NONE,
2, G_TYPE_INT, G_TYPE_SOCKET_ADDRESS);
/**
* GstSRTServerSink::client-removed:
* @gstsrtserversink: the srtserversink element that emitted this signal
* @sock: the client socket descriptor that was added to srtserversink
* @addr: the pointer of "struct sockaddr" that describes the @sock
* @addr_len: the length of @addr
*
* The given socket descriptor was removed from srtserversink.
*/
signals[SIG_CLIENT_REMOVED] =
g_signal_new ("client-removed", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstSRTServerSinkClass,
client_removed), NULL, NULL, g_cclosure_marshal_generic, G_TYPE_NONE,
2, G_TYPE_INT, G_TYPE_SOCKET_ADDRESS);
gst_element_class_add_static_pad_template (gstelement_class, &sink_template);
gst_element_class_set_metadata (gstelement_class,
"SRT server sink", "Sink/Network",
"Send data over the network via SRT",
"Justin Kim <justin.kim@collabora.com>");
gstbasesink_class->start = GST_DEBUG_FUNCPTR (gst_srt_server_sink_start);
gstbasesink_class->stop = GST_DEBUG_FUNCPTR (gst_srt_server_sink_stop);
gstbasesink_class->unlock = GST_DEBUG_FUNCPTR (gst_srt_server_sink_unlock);
gstbasesink_class->unlock_stop =
GST_DEBUG_FUNCPTR (gst_srt_server_sink_unlock_stop);
gstsrtbasesink_class->send_buffer =
GST_DEBUG_FUNCPTR (gst_srt_server_sink_send_buffer);
}
static void
gst_srt_server_sink_init (GstSRTServerSink * self)
{
GstSRTServerSinkPrivate *priv = GST_SRT_SERVER_SINK_GET_PRIVATE (self);
priv->poll_timeout = SRT_DEFAULT_POLL_TIMEOUT;
}