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gstreamer/gst/udp/gstudpsrc.c
Wim Taymans 285ec58919 gst/udp/gstudpsrc.c: Update documentation. 
Original commit message from CVS:
* gst/udp/gstudpsrc.c: (gst_udpsrc_create):
Update documentation.
2007-09-26 14:28:20 +00:00

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/* GStreamer
* Copyright (C) <2005> Wim Taymans <wim@fluendo.com>
* Copyright (C) <2005> Nokia Corporation <kai.vehmanen@nokia.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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-udpsrc
* @see_also: udpsink, multifdsink
*
* <refsect2>
* <para>
* udpsrc is a network source that reads UDP packets from the network.
* It can be combined with RTP depayloaders to implement RTP streaming.
* </para>
* <title>Examples</title>
* <para>
* Here is a simple pipeline to read from the default port and dump the udp packets.
* <programlisting>
* gst-launch -v udpsrc ! fakesink dump=1
* </programlisting>
* To actually generate udp packets on the default port one can use the
* udpsink element. When running the following pipeline in another terminal, the
* above mentioned pipeline should dump data packets to the console.
* <programlisting>
* gst-launch -v audiotestsrc ! udpsink
* </programlisting>
* </para>
* <para>
* The udpsrc element supports automatic port allocation by setting the
* "port" property to 0. the following pipeline reads UDP from a free port.
* <programlisting>
* gst-launch -v udpsrc port=0 ! fakesink
* </programlisting>
* After setting the udpsrc to PAUSED, the allocated port can be obtained by
* reading the port property.
* </para>
* <para>
* udpsrc can read from multicast groups by setting the multicast_group property
* to the IP address of the multicast group.
* </para>
* <para>
* Alternatively one can provide a custom socket to udpsrc with the "sockfd" property,
* udpsrc will then not allocate a socket itself but use the provided one.
* </para>
* <para>
* The "caps" property is mainly used to give a type to the UDP packet so that they
* can be autoplugged in GStreamer pipelines. This is very usefull for RTP
* implementations where the contents of the UDP packets is transfered out-of-bounds
* using SDP or other means.
* </para>
* <para>
* The "buffer" property is used to change the default kernel buffer sizes used for
* receiving packets. The buffer size may be increased for high-volume connections,
* or may be decreased to limit the possible backlog of incoming data.
* The system places an absolute limit on these values, on Linux, for example, the
* default buffer size is typically 50K and can be increased to maximally 100K.
* </para>
* <para>
* The "skip-first-bytes" property is used to strip off an arbitrary number of
* bytes from the start of the raw udp packet and can be used to strip off
* proprietary header, for example.
* </para>
* <para>
* The udpsrc is always a live source. It does however not provide a GstClock, this
* is left for upstream elements such as an RTP session manager or demuxer (such
* as an MPEG demuxer). As with all live sources, the captured buffers will have
* their timestamp set to the current running time of the pipeline.
* </para>
* <para>
* udpsrc implements a GstURIHandler interface that handles udp://host:port type
* URIs.
* </para>
* <para>
* If the <link linkend="GstUDPSrc--timeout">timeout property</link> is set to a
* value bigger than 0, udpsrc will generate an element message named
* <classname>&quot;GstUDPSrcTimeout&quot;</classname>
* if no data was recieved in the given timeout.
* The message's structure contains one field:
* <itemizedlist>
* <listitem>
* <para>
* #guint64
* <classname>&quot;timeout&quot;</classname>: the timeout in microseconds that
* expired when waiting for data.
* </para>
* </listitem>
* </itemizedlist>
* The message is typically used to detect that no UDP arrives in the receiver
* because it is blocked by a firewall.
* </para>
* <para>
* A custom file descriptor can be configured with the
* <link linkend="GstUDPSrc--sockfd">sockfd property</link>. The socket will be
* closed when setting the element to READY by default. This behaviour can be
* overriden with the <link linkend="GstUDPSrc--closefd">closefd property</link>,
* in which case the application is responsible for closing the file descriptor.
* </para>
* <para>
* Last reviewed on 2007-09-20 (0.10.7)
* </para>
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstudpsrc.h"
#include <unistd.h>
#include <stdlib.h>
#include <gst/netbuffer/gstnetbuffer.h>
#ifdef G_OS_WIN32
typedef int socklen_t;
#endif
#ifdef HAVE_FIONREAD_IN_SYS_FILIO
#include <sys/filio.h>
#endif
GST_DEBUG_CATEGORY_STATIC (udpsrc_debug);
#define GST_CAT_DEFAULT (udpsrc_debug)
/* the select call is also performed on the control sockets, that way
* we can send special commands to unblock or restart the select call */
#define CONTROL_RESTART 'R' /* restart the select call */
#define CONTROL_STOP 'S' /* stop the select call */
#define CONTROL_SOCKETS(src) src->control_sock
#define WRITE_SOCKET(src) src->control_sock[1]
#define READ_SOCKET(src) src->control_sock[0]
#define SEND_COMMAND(src, command, res) \
G_STMT_START { \
unsigned char c; c = command; \
res = write (WRITE_SOCKET(src), &c, 1); \
} G_STMT_END
#define READ_COMMAND(src, command, res) \
G_STMT_START { \
res = read(READ_SOCKET(src), &command, 1); \
} G_STMT_END
#define CLOSE_IF_REQUESTED(udpctx) \
if ((!udpctx->externalfd) || (udpctx->externalfd && udpctx->closefd)) \
CLOSE_SOCKET(udpctx->sock); \
udpctx->sock = -1;
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static const GstElementDetails gst_udpsrc_details =
GST_ELEMENT_DETAILS ("UDP packet receiver",
"Source/Network",
"Receive data over the network via UDP",
"Wim Taymans <wim@fluendo.com>\n"
"Thijs Vermeir <thijs.vermeir@barco.com>");
#define UDP_DEFAULT_PORT 4951
#define UDP_DEFAULT_MULTICAST_GROUP "0.0.0.0"
#define UDP_DEFAULT_URI "udp://"UDP_DEFAULT_MULTICAST_GROUP":"G_STRINGIFY(UDP_DEFAULT_PORT)
#define UDP_DEFAULT_CAPS NULL
#define UDP_DEFAULT_SOCKFD -1
#define UDP_DEFAULT_BUFFER_SIZE 0
#define UDP_DEFAULT_TIMEOUT 0
#define UDP_DEFAULT_SKIP_FIRST_BYTES 0
#define UDP_DEFAULT_CLOSEFD TRUE
#define UDP_DEFAULT_SOCK -1
enum
{
PROP_0,
PROP_PORT,
PROP_MULTICAST_GROUP,
PROP_URI,
PROP_CAPS,
PROP_SOCKFD,
PROP_BUFFER_SIZE,
PROP_TIMEOUT,
PROP_SKIP_FIRST_BYTES,
PROP_CLOSEFD,
PROP_SOCK
};
static void gst_udpsrc_uri_handler_init (gpointer g_iface, gpointer iface_data);
static GstCaps *gst_udpsrc_getcaps (GstBaseSrc * src);
static GstFlowReturn gst_udpsrc_create (GstPushSrc * psrc, GstBuffer ** buf);
static gboolean gst_udpsrc_start (GstBaseSrc * bsrc);
static gboolean gst_udpsrc_stop (GstBaseSrc * bsrc);
static gboolean gst_udpsrc_unlock (GstBaseSrc * bsrc);
static gboolean gst_udpsrc_unlock_stop (GstBaseSrc * bsrc);
static void gst_udpsrc_finalize (GObject * object);
static void gst_udpsrc_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_udpsrc_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void
_do_init (GType type)
{
static const GInterfaceInfo urihandler_info = {
gst_udpsrc_uri_handler_init,
NULL,
NULL
};
g_type_add_interface_static (type, GST_TYPE_URI_HANDLER, &urihandler_info);
GST_DEBUG_CATEGORY_INIT (udpsrc_debug, "udpsrc", 0, "UDP src");
}
GST_BOILERPLATE_FULL (GstUDPSrc, gst_udpsrc, GstPushSrc, GST_TYPE_PUSH_SRC,
_do_init);
static void
gst_udpsrc_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_template));
gst_element_class_set_details (element_class, &gst_udpsrc_details);
}
static void
gst_udpsrc_class_init (GstUDPSrcClass * klass)
{
GObjectClass *gobject_class;
GstBaseSrcClass *gstbasesrc_class;
GstPushSrcClass *gstpushsrc_class;
gobject_class = (GObjectClass *) klass;
gstbasesrc_class = (GstBaseSrcClass *) klass;
gstpushsrc_class = (GstPushSrcClass *) klass;
gobject_class->set_property = gst_udpsrc_set_property;
gobject_class->get_property = gst_udpsrc_get_property;
gobject_class->finalize = gst_udpsrc_finalize;
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_PORT,
g_param_spec_int ("port", "Port",
"The port to receive the packets from, 0=allocate", 0, G_MAXUINT16,
UDP_DEFAULT_PORT, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_MULTICAST_GROUP,
g_param_spec_string ("multicast_group", "Multicast Group",
"The Address of multicast group to join", UDP_DEFAULT_MULTICAST_GROUP,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_URI,
g_param_spec_string ("uri", "URI",
"URI in the form of udp://multicast_group:port", UDP_DEFAULT_URI,
G_PARAM_READWRITE));
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_object_class_install_property (gobject_class, PROP_SOCKFD,
g_param_spec_int ("sockfd", "Socket Handle",
"Socket to use for UDP reception. (-1 == allocate)",
-1, G_MAXINT, UDP_DEFAULT_SOCKFD, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_BUFFER_SIZE,
g_param_spec_int ("buffer-size", "Buffer Size",
"Size of the kernel receive buffer in bytes, 0=default", 0, G_MAXINT,
UDP_DEFAULT_BUFFER_SIZE, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TIMEOUT,
g_param_spec_uint64 ("timeout", "Timeout",
"Post a message after timeout microseconds (0 = disabled)", 0,
G_MAXUINT64, UDP_DEFAULT_TIMEOUT, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass),
PROP_SKIP_FIRST_BYTES, g_param_spec_int ("skip-first-bytes",
"Skip first bytes", "number of bytes to skip for each udp packet", 0,
G_MAXINT, UDP_DEFAULT_SKIP_FIRST_BYTES, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_CLOSEFD,
g_param_spec_boolean ("closefd", "Close sockfd",
"Close sockfd if passed as property on state change",
UDP_DEFAULT_CLOSEFD, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_SOCK,
g_param_spec_int ("sock", "Socket Handle",
"Socket currently in use for UDP reception. (-1 = no socket)",
-1, G_MAXINT, UDP_DEFAULT_SOCK, G_PARAM_READABLE));
gstbasesrc_class->start = gst_udpsrc_start;
gstbasesrc_class->stop = gst_udpsrc_stop;
gstbasesrc_class->unlock = gst_udpsrc_unlock;
gstbasesrc_class->unlock_stop = gst_udpsrc_unlock_stop;
gstbasesrc_class->get_caps = gst_udpsrc_getcaps;
gstpushsrc_class->create = gst_udpsrc_create;
}
static void
gst_udpsrc_init (GstUDPSrc * udpsrc, GstUDPSrcClass * g_class)
{
WSA_STARTUP (udpsrc);
gst_base_src_set_live (GST_BASE_SRC (udpsrc), TRUE);
udpsrc->port = UDP_DEFAULT_PORT;
udpsrc->sockfd = UDP_DEFAULT_SOCKFD;
udpsrc->multi_group = g_strdup (UDP_DEFAULT_MULTICAST_GROUP);
udpsrc->uri = g_strdup (UDP_DEFAULT_URI);
udpsrc->buffer_size = UDP_DEFAULT_BUFFER_SIZE;
udpsrc->timeout = UDP_DEFAULT_TIMEOUT;
udpsrc->skip_first_bytes = UDP_DEFAULT_SKIP_FIRST_BYTES;
udpsrc->closefd = UDP_DEFAULT_CLOSEFD;
udpsrc->externalfd = (udpsrc->sockfd != -1);
udpsrc->sock = UDP_DEFAULT_SOCK;
udpsrc->control_sock[0] = -1;
udpsrc->control_sock[1] = -1;
gst_base_src_set_format (GST_BASE_SRC (udpsrc), GST_FORMAT_TIME);
gst_base_src_set_do_timestamp (GST_BASE_SRC (udpsrc), TRUE);
}
static void
gst_udpsrc_finalize (GObject * object)
{
GstUDPSrc *udpsrc;
udpsrc = GST_UDPSRC (object);
if (udpsrc->caps)
gst_caps_unref (udpsrc->caps);
g_free (udpsrc->multi_group);
g_free (udpsrc->uri);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GstCaps *
gst_udpsrc_getcaps (GstBaseSrc * src)
{
GstUDPSrc *udpsrc;
udpsrc = GST_UDPSRC (src);
if (udpsrc->caps)
return gst_caps_ref (udpsrc->caps);
else
return gst_caps_new_any ();
}
static GstFlowReturn
gst_udpsrc_create (GstPushSrc * psrc, GstBuffer ** buf)
{
GstUDPSrc *udpsrc;
GstNetBuffer *outbuf;
struct sockaddr_in tmpaddr;
socklen_t len;
fd_set read_fds;
guint max_sock;
guint8 *pktdata;
gint pktsize;
#ifdef G_OS_UNIX
gint readsize;
#elif defined G_OS_WIN32
gulong readsize;
#endif
gint ret;
gboolean try_again;
udpsrc = GST_UDPSRC (psrc);
/* quick check, avoid going in select when we already have data */
readsize = 0;
if ((ret = IOCTL_SOCKET (udpsrc->sock, FIONREAD, &readsize)) < 0)
goto ioctl_failed;
if (readsize > 0)
goto no_select;
do {
gboolean stop;
struct timeval timeval, *timeout;
FD_ZERO (&read_fds);
FD_SET (udpsrc->sock, &read_fds);
#ifndef G_OS_WIN32
FD_SET (READ_SOCKET (udpsrc), &read_fds);
#endif
max_sock = MAX (udpsrc->sock, READ_SOCKET (udpsrc));
try_again = FALSE;
stop = FALSE;
GST_LOG_OBJECT (udpsrc, "doing select, timeout %" G_GUINT64_FORMAT,
udpsrc->timeout);
if (udpsrc->timeout > 0) {
timeval.tv_sec = udpsrc->timeout / 1000000;
timeval.tv_usec = udpsrc->timeout % 1000000;
timeout = &timeval;
} else {
timeout = NULL;
}
#ifdef G_OS_WIN32
if (((max_sock + 1) != READ_SOCKET (udpsrc)) ||
((max_sock + 1) != WRITE_SOCKET (udpsrc))) {
ret = select (max_sock + 1, &read_fds, NULL, NULL, timeout);
} else {
ret = 1;
}
#else
ret = select (max_sock + 1, &read_fds, NULL, NULL, timeout);
#endif
GST_LOG_OBJECT (udpsrc, "select returned %d", ret);
if (ret < 0) {
#ifdef G_OS_WIN32
if (WSAGetLastError () != WSAEINTR)
goto select_error;
#else
if (errno != EAGAIN && errno != EINTR)
goto select_error;
#endif
try_again = TRUE;
} else if (ret == 0) {
/* timeout, post element message */
gst_element_post_message (GST_ELEMENT_CAST (udpsrc),
gst_message_new_element (GST_OBJECT_CAST (udpsrc),
gst_structure_new ("GstUDPSrcTimeout",
"timeout", G_TYPE_UINT64, udpsrc->timeout, NULL)));
try_again = TRUE;
} else {
if (FD_ISSET (READ_SOCKET (udpsrc), &read_fds))
goto stopped;
}
} while (try_again);
/* ask how much is available for reading on the socket, this should be exactly
* one UDP packet. We will check the return value, though, because in some
* case it can return 0 and we don't want a 0 sized buffer. */
readsize = 0;
if ((ret = IOCTL_SOCKET (udpsrc->sock, FIONREAD, &readsize)) < 0)
goto ioctl_failed;
if (!readsize)
goto nothing_to_read;
no_select:
GST_LOG_OBJECT (udpsrc, "ioctl says %d bytes available", (int) readsize);
pktdata = g_malloc (readsize);
pktsize = readsize;
while (TRUE) {
len = sizeof (struct sockaddr);
ret = recvfrom (udpsrc->sock, pktdata, pktsize,
0, (struct sockaddr *) &tmpaddr, &len);
if (ret < 0) {
if (errno != EAGAIN && errno != EINTR)
goto receive_error;
} else
break;
}
/* special case buffer so receivers can also track the address */
outbuf = gst_netbuffer_new ();
GST_BUFFER_MALLOCDATA (outbuf) = pktdata;
/* patch pktdata and len when stripping off the headers */
if (udpsrc->skip_first_bytes != 0) {
if (G_UNLIKELY (readsize <= udpsrc->skip_first_bytes))
goto skip_error;
pktdata += udpsrc->skip_first_bytes;
ret -= udpsrc->skip_first_bytes;
}
GST_BUFFER_DATA (outbuf) = pktdata;
GST_BUFFER_SIZE (outbuf) = ret;
gst_netaddress_set_ip4_address (&outbuf->from, tmpaddr.sin_addr.s_addr,
tmpaddr.sin_port);
gst_buffer_set_caps (GST_BUFFER_CAST (outbuf), udpsrc->caps);
GST_LOG_OBJECT (udpsrc, "read %d bytes", (int) readsize);
*buf = GST_BUFFER_CAST (outbuf);
return GST_FLOW_OK;
/* ERRORS */
select_error:
{
GST_ELEMENT_ERROR (udpsrc, RESOURCE, READ, (NULL),
("select error %d: %s (%d)", ret, g_strerror (errno), errno));
return GST_FLOW_ERROR;
}
stopped:
{
GST_DEBUG ("stop called");
return GST_FLOW_WRONG_STATE;
}
ioctl_failed:
{
GST_ELEMENT_ERROR (udpsrc, RESOURCE, READ, (NULL),
("ioctl failed %d: %s (%d)", ret, g_strerror (errno), errno));
return GST_FLOW_ERROR;
}
nothing_to_read:
{
GST_ELEMENT_ERROR (udpsrc, RESOURCE, READ, (NULL),
("ioctl returned readsize 0 %d: %s (%d)", ret, g_strerror (errno),
errno));
return GST_FLOW_ERROR;
}
receive_error:
{
g_free (pktdata);
GST_ELEMENT_ERROR (udpsrc, RESOURCE, READ, (NULL),
("receive error %d: %s (%d)", ret, g_strerror (errno), errno));
return GST_FLOW_ERROR;
}
skip_error:
{
GST_ELEMENT_ERROR (udpsrc, STREAM, DECODE, (NULL),
("UDP buffer to small to skip header"));
return GST_FLOW_ERROR;
}
}
/* Call this function when multicastgroup and/or port are updated */
static void
gst_udpsrc_update_uri (GstUDPSrc * src)
{
g_free (src->uri);
src->uri = g_strdup_printf ("udp://%s:%d", src->multi_group, src->port);
GST_DEBUG_OBJECT (src, "updated uri to %s", src->uri);
}
static gboolean
gst_udpsrc_set_uri (GstUDPSrc * src, const gchar * uri)
{
gchar *protocol;
gchar *location;
gchar *colptr;
protocol = gst_uri_get_protocol (uri);
if (strcmp (protocol, "udp") != 0)
goto wrong_protocol;
g_free (protocol);
location = gst_uri_get_location (uri);
if (!location)
return FALSE;
colptr = strstr (location, ":");
if (colptr != NULL) {
g_free (src->multi_group);
src->multi_group = g_strndup (location, colptr - location);
src->port = atoi (colptr + 1);
} else {
g_free (src->multi_group);
src->multi_group = g_strdup (location);
src->port = UDP_DEFAULT_PORT;
}
g_free (location);
gst_udpsrc_update_uri (src);
return TRUE;
/* ERRORS */
wrong_protocol:
{
g_free (protocol);
GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
("error parsing uri %s: wrong protocol (%s != udp)", uri, protocol));
return FALSE;
}
}
static void
gst_udpsrc_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstUDPSrc *udpsrc = GST_UDPSRC (object);
switch (prop_id) {
case PROP_BUFFER_SIZE:
udpsrc->buffer_size = g_value_get_int (value);
break;
case PROP_PORT:
udpsrc->port = g_value_get_int (value);
gst_udpsrc_update_uri (udpsrc);
break;
case PROP_MULTICAST_GROUP:
g_free (udpsrc->multi_group);
if (g_value_get_string (value) == NULL)
udpsrc->multi_group = g_strdup (UDP_DEFAULT_MULTICAST_GROUP);
else
udpsrc->multi_group = g_value_dup_string (value);
gst_udpsrc_update_uri (udpsrc);
break;
case PROP_URI:
gst_udpsrc_set_uri (udpsrc, g_value_get_string (value));
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);
}
old_caps = udpsrc->caps;
udpsrc->caps = new_caps;
if (old_caps)
gst_caps_unref (old_caps);
gst_pad_set_caps (GST_BASE_SRC (udpsrc)->srcpad, new_caps);
break;
}
case PROP_SOCKFD:
udpsrc->sockfd = g_value_get_int (value);
GST_DEBUG ("setting SOCKFD to %d", udpsrc->sockfd);
break;
case PROP_TIMEOUT:
udpsrc->timeout = g_value_get_uint64 (value);
break;
case PROP_SKIP_FIRST_BYTES:
udpsrc->skip_first_bytes = g_value_get_int (value);
break;
case PROP_CLOSEFD:
udpsrc->closefd = g_value_get_boolean (value);
break;
default:
break;
}
}
static void
gst_udpsrc_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstUDPSrc *udpsrc = GST_UDPSRC (object);
switch (prop_id) {
case PROP_BUFFER_SIZE:
g_value_set_int (value, udpsrc->buffer_size);
break;
case PROP_PORT:
g_value_set_int (value, udpsrc->port);
break;
case PROP_MULTICAST_GROUP:
g_value_set_string (value, udpsrc->multi_group);
break;
case PROP_URI:
g_value_set_string (value, udpsrc->uri);
break;
case PROP_CAPS:
gst_value_set_caps (value, udpsrc->caps);
break;
case PROP_SOCKFD:
g_value_set_int (value, udpsrc->sockfd);
break;
case PROP_TIMEOUT:
g_value_set_uint64 (value, udpsrc->timeout);
break;
case PROP_SKIP_FIRST_BYTES:
g_value_set_int (value, udpsrc->skip_first_bytes);
break;
case PROP_CLOSEFD:
g_value_set_boolean (value, udpsrc->closefd);
break;
case PROP_SOCK:
g_value_set_int (value, udpsrc->sock);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/* create a socket for sending to remote machine */
static gboolean
gst_udpsrc_start (GstBaseSrc * bsrc)
{
guint bc_val;
gint reuse;
struct sockaddr_in my_addr;
guint len;
int port;
GstUDPSrc *src;
gint ret;
int rcvsize;
src = GST_UDPSRC (bsrc);
#ifdef G_OS_WIN32
GST_DEBUG_OBJECT (src, "creating pipe");
/* This should work on UNIX too. PF_UNIX sockets replaced with pipe */
/* pipe( CONTROL_SOCKETS(src) ) */
if ((ret = pipe (CONTROL_SOCKETS (src))) < 0)
goto no_socket_pair;
#else
GST_DEBUG_OBJECT (src, "creating socket pair");
if ((ret = socketpair (PF_UNIX, SOCK_STREAM, 0, CONTROL_SOCKETS (src))) < 0)
goto no_socket_pair;
fcntl (READ_SOCKET (src), F_SETFL, O_NONBLOCK);
fcntl (WRITE_SOCKET (src), F_SETFL, O_NONBLOCK);
#endif
if (!inet_aton (src->multi_group, &(src->multi_addr.imr_multiaddr)))
src->multi_addr.imr_multiaddr.s_addr = 0;
if (src->sockfd == -1) {
/* need to allocate a socket */
if ((ret = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
goto no_socket;
src->sock = ret;
src->externalfd = FALSE;
reuse = 1;
if ((ret =
setsockopt (src->sock, SOL_SOCKET, SO_REUSEADDR, &reuse,
sizeof (reuse))) < 0)
goto setsockopt_error;
memset (&src->myaddr, 0, sizeof (src->myaddr));
src->myaddr.sin_family = AF_INET; /* host byte order */
src->myaddr.sin_port = htons (src->port); /* short, network byte order */
if (src->multi_addr.imr_multiaddr.s_addr)
src->myaddr.sin_addr.s_addr = src->multi_addr.imr_multiaddr.s_addr;
else
src->myaddr.sin_addr.s_addr = INADDR_ANY;
GST_DEBUG_OBJECT (src, "binding on port %d", src->port);
if ((ret = bind (src->sock, (struct sockaddr *) &src->myaddr,
sizeof (src->myaddr))) < 0)
goto bind_error;
} else {
/* we use the configured socket */
src->sock = src->sockfd;
src->externalfd = TRUE;
}
if (src->multi_addr.imr_multiaddr.s_addr) {
src->multi_addr.imr_interface.s_addr = INADDR_ANY;
if ((ret =
setsockopt (src->sock, IPPROTO_IP, IP_ADD_MEMBERSHIP,
&src->multi_addr, sizeof (src->multi_addr))) < 0)
goto membership;
}
len = sizeof (my_addr);
if ((ret = getsockname (src->sock, (struct sockaddr *) &my_addr, &len)) < 0)
goto getsockname_error;
len = sizeof (rcvsize);
if (src->buffer_size != 0) {
rcvsize = src->buffer_size;
GST_DEBUG_OBJECT (src, "setting udp buffer of %d bytes", rcvsize);
/* set buffer size, Note that on Linux this is typically limited to a
* maximum of around 100K. Also a minimum of 128 bytes is required on
* Linux. */
ret = setsockopt (src->sock, SOL_SOCKET, SO_RCVBUF, (void *) &rcvsize, len);
if (ret != 0)
goto udpbuffer_error;
}
/* read the value of the receive buffer. Note that on linux this returns 2x the
* value we set because the kernel allocates extra memory for metadata.
* The default on Linux is about 100K (which is about 50K without metadata) */
ret = getsockopt (src->sock, SOL_SOCKET, SO_RCVBUF, (void *) &rcvsize, &len);
if (ret == 0)
GST_DEBUG_OBJECT (src, "have udp buffer of %d bytes", rcvsize);
else
GST_DEBUG_OBJECT (src, "could not get udp buffer size");
bc_val = 1;
if ((ret = setsockopt (src->sock, SOL_SOCKET, SO_BROADCAST, &bc_val,
sizeof (bc_val))) < 0)
goto no_broadcast;
port = ntohs (my_addr.sin_port);
GST_DEBUG_OBJECT (src, "bound, on port %d", port);
if (port != src->port) {
src->port = port;
GST_DEBUG_OBJECT (src, "notifying %d", port);
g_object_notify (G_OBJECT (src), "port");
}
src->myaddr.sin_port = htons (src->port + 1);
return TRUE;
/* ERRORS */
no_socket_pair:
{
GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ_WRITE, (NULL),
("no socket pair %d: %s (%d)", ret, g_strerror (errno), errno));
return FALSE;
}
no_socket:
{
GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (NULL),
("no socket error %d: %s (%d)", ret, g_strerror (errno), errno));
return FALSE;
}
setsockopt_error:
{
CLOSE_IF_REQUESTED (src);
GST_ELEMENT_ERROR (src, RESOURCE, SETTINGS, (NULL),
("setsockopt failed %d: %s (%d)", ret, g_strerror (errno), errno));
return FALSE;
}
bind_error:
{
CLOSE_IF_REQUESTED (src);
GST_ELEMENT_ERROR (src, RESOURCE, SETTINGS, (NULL),
("bind failed %d: %s (%d)", ret, g_strerror (errno), errno));
return FALSE;
}
membership:
{
CLOSE_IF_REQUESTED (src);
GST_ELEMENT_ERROR (src, RESOURCE, SETTINGS, (NULL),
("could add membership %d: %s (%d)", ret, g_strerror (errno), errno));
return FALSE;
}
getsockname_error:
{
CLOSE_IF_REQUESTED (src);
GST_ELEMENT_ERROR (src, RESOURCE, SETTINGS, (NULL),
("getsockname failed %d: %s (%d)", ret, g_strerror (errno), errno));
return FALSE;
}
udpbuffer_error:
{
CLOSE_IF_REQUESTED (src);
GST_ELEMENT_ERROR (src, RESOURCE, SETTINGS, (NULL),
("Could not create a buffer of the size requested, %d: %s (%d)", ret,
g_strerror (errno), errno));
return FALSE;
}
no_broadcast:
{
CLOSE_IF_REQUESTED (src);
GST_ELEMENT_ERROR (src, RESOURCE, SETTINGS, (NULL),
("could not configure socket for broadcast %d: %s (%d)", ret,
g_strerror (errno), errno));
return FALSE;
}
}
static gboolean
gst_udpsrc_unlock (GstBaseSrc * bsrc)
{
GstUDPSrc *src;
gint res;
src = GST_UDPSRC (bsrc);
GST_LOG_OBJECT (src, "sending stop command");
SEND_COMMAND (src, CONTROL_STOP, res);
GST_LOG_OBJECT (src, "sent stop command %d", res);
return TRUE;
}
static gboolean
gst_udpsrc_unlock_stop (GstBaseSrc * bsrc)
{
GstUDPSrc *src;
src = GST_UDPSRC (bsrc);
GST_LOG_OBJECT (src, "clearing unlock command queue");
while (TRUE) {
gchar command;
int res;
GST_LOG_OBJECT (src, "reading command");
READ_COMMAND (src, command, res);
if (res <= 0) {
GST_LOG_OBJECT (src, "no more commands");
/* no more commands */
break;
}
}
return TRUE;
}
static gboolean
gst_udpsrc_stop (GstBaseSrc * bsrc)
{
GstUDPSrc *src;
src = GST_UDPSRC (bsrc);
GST_DEBUG ("stopping, closing sockets");
if (src->sock != -1) {
CLOSE_IF_REQUESTED (src);
}
/* pipes on WIN32 else sockets */
if (src->control_sock[0] != -1) {
close (src->control_sock[0]);
src->control_sock[0] = -1;
}
if (src->control_sock[1] != -1) {
close (src->control_sock[1]);
src->control_sock[1] = -1;
}
WSA_CLEANUP (src);
return TRUE;
}
/*** GSTURIHANDLER INTERFACE *************************************************/
static GstURIType
gst_udpsrc_uri_get_type (void)
{
return GST_URI_SRC;
}
static gchar **
gst_udpsrc_uri_get_protocols (void)
{
static gchar *protocols[] = { "udp", NULL };
return protocols;
}
static const gchar *
gst_udpsrc_uri_get_uri (GstURIHandler * handler)
{
GstUDPSrc *src = GST_UDPSRC (handler);
return src->uri;
}
static gboolean
gst_udpsrc_uri_set_uri (GstURIHandler * handler, const gchar * uri)
{
gboolean ret;
GstUDPSrc *src = GST_UDPSRC (handler);
ret = gst_udpsrc_set_uri (src, uri);
return ret;
}
static void
gst_udpsrc_uri_handler_init (gpointer g_iface, gpointer iface_data)
{
GstURIHandlerInterface *iface = (GstURIHandlerInterface *) g_iface;
iface->get_type = gst_udpsrc_uri_get_type;
iface->get_protocols = gst_udpsrc_uri_get_protocols;
iface->get_uri = gst_udpsrc_uri_get_uri;
iface->set_uri = gst_udpsrc_uri_set_uri;
}
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