gstreamer/ext/srt/gstsrtserversrc.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-srtserversrc
* @title: srtserversrc
*
* srtserversrc is a network source that reads <ulink url="http://www.srtalliance.org/">SRT</ulink>
* packets from the network. Although SRT is a protocol based on UDP, srtserversrc works like
* a server socket of connection-oriented protocol, but it accepts to only one client connection.
*
* <refsect2>
* <title>Examples</title>
* |[
* gst-launch-1.0 -v srtserversrc uri="srt://:7001" ! fakesink
* ]| This pipeline shows how to bind SRT server by setting #GstSRTServerSrc:uri property.
* </refsect2>
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstsrtserversrc.h"
#include "gstsrt.h"
#include <gio/gio.h>
#define SRT_DEFAULT_POLL_TIMEOUT 100
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
#define GST_CAT_DEFAULT gst_debug_srt_server_src
GST_DEBUG_CATEGORY (GST_CAT_DEFAULT);
struct _GstSRTServerSrcPrivate
{
SRTSOCKET sock;
SRTSOCKET client_sock;
GSocketAddress *client_sockaddr;
gint poll_id;
gint poll_timeout;
gboolean has_client;
gboolean cancelled;
};
#define GST_SRT_SERVER_SRC_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_SRT_SERVER_SRC, GstSRTServerSrcPrivate))
enum
{
PROP_POLL_TIMEOUT = 1,
/*< private > */
PROP_LAST
};
static GParamSpec *properties[PROP_LAST];
enum
{
SIG_CLIENT_ADDED,
SIG_CLIENT_CLOSED,
LAST_SIGNAL
};
static guint signals[LAST_SIGNAL] = { 0 };
#define gst_srt_server_src_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstSRTServerSrc, gst_srt_server_src,
GST_TYPE_SRT_BASE_SRC, G_ADD_PRIVATE (GstSRTServerSrc)
GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "srtserversrc", 0,
"SRT Server Source"));
static void
gst_srt_server_src_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstSRTServerSrc *self = GST_SRT_SERVER_SRC (object);
GstSRTServerSrcPrivate *priv = GST_SRT_SERVER_SRC_GET_PRIVATE (self);
switch (prop_id) {
case PROP_POLL_TIMEOUT:
g_value_set_int (value, priv->poll_timeout);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_srt_server_src_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstSRTServerSrc *self = GST_SRT_SERVER_SRC (object);
GstSRTServerSrcPrivate *priv = GST_SRT_SERVER_SRC_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 void
gst_srt_server_src_finalize (GObject * object)
{
GstSRTServerSrc *self = GST_SRT_SERVER_SRC (object);
GstSRTServerSrcPrivate *priv = GST_SRT_SERVER_SRC_GET_PRIVATE (self);
if (priv->poll_id != SRT_ERROR) {
srt_epoll_release (priv->poll_id);
priv->poll_id = SRT_ERROR;
}
if (priv->sock != SRT_ERROR) {
srt_close (priv->sock);
priv->sock = SRT_ERROR;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GstFlowReturn
gst_srt_server_src_fill (GstPushSrc * src, GstBuffer * outbuf)
{
GstSRTServerSrc *self = GST_SRT_SERVER_SRC (src);
GstSRTServerSrcPrivate *priv = GST_SRT_SERVER_SRC_GET_PRIVATE (self);
GstFlowReturn ret = GST_FLOW_OK;
GstMapInfo info;
SRTSOCKET ready[2];
gint recv_len;
struct sockaddr client_sa;
size_t client_sa_len;
while (!priv->has_client) {
GST_DEBUG_OBJECT (self, "poll wait (timeout: %d)", priv->poll_timeout);
/* Make SRT server socket non-blocking */
srt_setsockopt (priv->sock, 0, SRTO_SNDSYN, &(int) {
0}, sizeof (int));
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);
/* Assuming that timeout error is normal */
if (srt_errno != SRT_ETIMEOUT) {
GST_ELEMENT_ERROR (src, RESOURCE, FAILED,
("SRT error: %s", srt_getlasterror_str ()), (NULL));
return GST_FLOW_ERROR;
}
/* Mimicking cancellable */
if (srt_errno == SRT_ETIMEOUT && priv->cancelled) {
GST_DEBUG_OBJECT (self, "Cancelled waiting for client");
return GST_FLOW_FLUSHING;
}
continue;
}
priv->client_sock =
srt_accept (priv->sock, &client_sa, (int *) &client_sa_len);
GST_DEBUG_OBJECT (self, "checking client sock");
if (priv->client_sock == SRT_INVALID_SOCK) {
GST_WARNING_OBJECT (self,
"detected invalid SRT client socket (reason: %s)",
srt_getlasterror_str ());
srt_clearlasterror ();
} else {
priv->has_client = TRUE;
g_clear_object (&priv->client_sockaddr);
priv->client_sockaddr = g_socket_address_new_from_native (&client_sa,
client_sa_len);
g_signal_emit (self, signals[SIG_CLIENT_ADDED], 0,
priv->client_sock, priv->client_sockaddr);
}
}
GST_DEBUG_OBJECT (self, "filling buffer");
if (!gst_buffer_map (outbuf, &info, GST_MAP_WRITE)) {
GST_ELEMENT_ERROR (src, RESOURCE, WRITE,
("Could not map the output stream"), (NULL));
ret = GST_FLOW_ERROR;
goto out;
}
recv_len = srt_recvmsg (priv->client_sock, (char *) info.data,
gst_buffer_get_size (outbuf));
gst_buffer_unmap (outbuf, &info);
if (recv_len == SRT_ERROR) {
GST_WARNING_OBJECT (self, "%s", srt_getlasterror_str ());
g_signal_emit (self, signals[SIG_CLIENT_CLOSED], 0,
priv->client_sock, priv->client_sockaddr);
srt_close (priv->client_sock);
priv->client_sock = SRT_INVALID_SOCK;
g_clear_object (&priv->client_sockaddr);
priv->has_client = FALSE;
gst_buffer_resize (outbuf, 0, 0);
ret = GST_FLOW_OK;
goto out;
} else if (recv_len == 0) {
ret = GST_FLOW_EOS;
goto out;
}
GST_BUFFER_PTS (outbuf) =
gst_clock_get_time (GST_ELEMENT_CLOCK (src)) -
GST_ELEMENT_CAST (src)->base_time;
gst_buffer_resize (outbuf, 0, recv_len);
GST_LOG_OBJECT (src,
"filled 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));
out:
return ret;
}
static gboolean
gst_srt_server_src_start (GstBaseSrc * src)
{
GstSRTServerSrc *self = GST_SRT_SERVER_SRC (src);
GstSRTServerSrcPrivate *priv = GST_SRT_SERVER_SRC_GET_PRIVATE (self);
GstSRTBaseSrc *base = GST_SRT_BASE_SRC (src);
GstUri *uri = gst_uri_ref (base->uri);
GError *error = NULL;
struct sockaddr sa;
size_t sa_len;
GSocketAddress *socket_address;
const gchar *host;
int lat = base->latency;
if (gst_uri_get_port (uri) == GST_URI_NO_PORT) {
GST_ELEMENT_ERROR (src, 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_ELEMENT_ERROR (self, RESOURCE, OPEN_READ, ("Invalid URI"),
("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_ELEMENT_ERROR (self, RESOURCE, OPEN_READ, ("Invalid URI"),
("cannot resolve address (reason: %s)", error->message));
goto failed;
}
priv->sock = srt_socket (sa.sa_family, SOCK_DGRAM, 0);
if (priv->sock == SRT_ERROR) {
GST_ELEMENT_ERROR (self, LIBRARY, INIT, (NULL),
("failed to create poll id for SRT socket (reason: %s)",
srt_getlasterror_str ()));
goto failed;
}
/* 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 receiver */
srt_setsockopt (priv->sock, 0, SRTO_SENDER, &(int) {
0}, 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_ELEMENT_ERROR (self, LIBRARY, INIT, (NULL),
("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_ELEMENT_ERROR (self, RESOURCE, OPEN_READ, (NULL),
("failed to bind SRT server socket (reason: %s)",
srt_getlasterror_str ()));
goto failed;
}
if (srt_listen (priv->sock, 1) == SRT_ERROR) {
GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ, (NULL),
("failed to listen SRT socket (reason: %s)", srt_getlasterror_str ()));
goto failed;
}
g_clear_pointer (&uri, gst_uri_unref);
g_clear_object (&socket_address);
return TRUE;
failed:
if (priv->poll_id != SRT_ERROR) {
srt_epoll_release (priv->poll_id);
priv->poll_id = SRT_ERROR;
}
if (priv->sock != SRT_ERROR) {
srt_close (priv->sock);
priv->sock = SRT_ERROR;
}
g_clear_error (&error);
g_clear_pointer (&uri, gst_uri_unref);
g_clear_object (&socket_address);
return FALSE;
}
static gboolean
gst_srt_server_src_stop (GstBaseSrc * src)
{
GstSRTServerSrc *self = GST_SRT_SERVER_SRC (src);
GstSRTServerSrcPrivate *priv = GST_SRT_SERVER_SRC_GET_PRIVATE (self);
if (priv->client_sock != SRT_INVALID_SOCK) {
g_signal_emit (self, signals[SIG_CLIENT_ADDED], 0,
priv->client_sock, priv->client_sockaddr);
srt_close (priv->client_sock);
g_clear_object (&priv->client_sockaddr);
priv->client_sock = SRT_INVALID_SOCK;
priv->has_client = FALSE;
}
if (priv->poll_id != SRT_ERROR) {
srt_epoll_remove_usock (priv->poll_id, priv->sock);
srt_epoll_release (priv->poll_id);
priv->poll_id = SRT_ERROR;
}
if (priv->sock != SRT_INVALID_SOCK) {
GST_DEBUG_OBJECT (self, "closing SRT connection");
srt_close (priv->sock);
priv->sock = SRT_INVALID_SOCK;
}
priv->cancelled = FALSE;
return TRUE;
}
static gboolean
gst_srt_server_src_unlock (GstBaseSrc * src)
{
GstSRTServerSrc *self = GST_SRT_SERVER_SRC (src);
GstSRTServerSrcPrivate *priv = GST_SRT_SERVER_SRC_GET_PRIVATE (self);
priv->cancelled = TRUE;
return TRUE;
}
static gboolean
gst_srt_server_src_unlock_stop (GstBaseSrc * src)
{
GstSRTServerSrc *self = GST_SRT_SERVER_SRC (src);
GstSRTServerSrcPrivate *priv = GST_SRT_SERVER_SRC_GET_PRIVATE (self);
priv->cancelled = FALSE;
return TRUE;
}
static void
gst_srt_server_src_class_init (GstSRTServerSrcClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
GstBaseSrcClass *gstbasesrc_class = GST_BASE_SRC_CLASS (klass);
GstPushSrcClass *gstpushsrc_class = GST_PUSH_SRC_CLASS (klass);
gobject_class->set_property = gst_srt_server_src_set_property;
gobject_class->get_property = gst_srt_server_src_get_property;
gobject_class->finalize = gst_srt_server_src_finalize;
/**
* GstSRTServerSrc:poll-timeout:
*
* The timeout(ms) value when polling SRT socket. For #GstSRTServerSrc,
* this value shouldn't be set as -1 (infinite) because "srt_epoll_wait"
* isn't cancellable unless closing the socket.
*/
properties[PROP_POLL_TIMEOUT] =
g_param_spec_int ("poll-timeout", "Poll timeout",
"Return poll wait after timeout miliseconds", 0, G_MAXINT32,
SRT_DEFAULT_POLL_TIMEOUT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
g_object_class_install_properties (gobject_class, PROP_LAST, properties);
/**
* GstSRTServerSrc::client-added:
* @gstsrtserversrc: the srtserversrc element that emitted this signal
* @sock: the client socket descriptor that was added to srtserversrc
* @addr: the pointer of "struct sockaddr" that describes the @sock
* @addr_len: the length of @addr
*
* The given socket descriptor was added to srtserversrc.
*/
signals[SIG_CLIENT_ADDED] =
g_signal_new ("client-added", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstSRTServerSrcClass, client_added),
NULL, NULL, g_cclosure_marshal_generic, G_TYPE_NONE,
2, G_TYPE_INT, G_TYPE_SOCKET_ADDRESS);
/**
* GstSRTServerSrc::client-closed:
* @gstsrtserversrc: the srtserversrc element that emitted this signal
* @sock: the client socket descriptor that was added to srtserversrc
* @addr: the pointer of "struct sockaddr" that describes the @sock
* @addr_len: the length of @addr
*
* The given socket descriptor was closed.
*/
signals[SIG_CLIENT_CLOSED] =
g_signal_new ("client-closed", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstSRTServerSrcClass, client_closed),
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, &src_template);
gst_element_class_set_metadata (gstelement_class,
"SRT Server source", "Source/Network",
"Receive data over the network via SRT",
"Justin Kim <justin.kim@collabora.com>");
gstbasesrc_class->start = GST_DEBUG_FUNCPTR (gst_srt_server_src_start);
gstbasesrc_class->stop = GST_DEBUG_FUNCPTR (gst_srt_server_src_stop);
gstbasesrc_class->unlock = GST_DEBUG_FUNCPTR (gst_srt_server_src_unlock);
gstbasesrc_class->unlock_stop =
GST_DEBUG_FUNCPTR (gst_srt_server_src_unlock_stop);
gstpushsrc_class->fill = GST_DEBUG_FUNCPTR (gst_srt_server_src_fill);
}
static void
gst_srt_server_src_init (GstSRTServerSrc * self)
{
GstSRTServerSrcPrivate *priv = GST_SRT_SERVER_SRC_GET_PRIVATE (self);
priv->sock = SRT_INVALID_SOCK;
priv->client_sock = SRT_INVALID_SOCK;
priv->poll_id = SRT_ERROR;
priv->poll_timeout = SRT_DEFAULT_POLL_TIMEOUT;
}