/* GStreamer * Copyright (C) <2005> Wim Taymans * Copyright (C) <2005> Nokia Corporation * Copyright (C) <2012> Collabora Ltd. * Author: Sebastian Dröge * Copyright (C) 2014 Tim-Philipp Müller * Copyright (C) 2014 Centricular Ltd * * 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-udpsrc * @see_also: udpsink, multifdsink * * udpsrc is a network source that reads UDP packets from the network. * It can be combined with RTP depayloaders to implement RTP streaming. * * The udpsrc element supports automatic port allocation by setting the * #GstUDPSrc:port property to 0. After setting the udpsrc to PAUSED, the * allocated port can be obtained by reading the port property. * * udpsrc can read from multicast groups by setting the #GstUDPSrc:multicast-group * property to the IP address of the multicast group. * * Alternatively one can provide a custom socket to udpsrc with the #GstUDPSrc:socket * property, udpsrc will then not allocate a socket itself but use the provided * one. * * The #GstUDPSrc: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 useful * for RTP implementations where the contents of the UDP packets is transfered * out-of-bounds using SDP or other means. * * The #GstUDPSrc:buffer-size property is used to change the default kernel * buffersizes 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. * * The #GstUDPSrc: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. * * 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. * * udpsrc implements a #GstURIHandler interface that handles udp://host:port * type URIs. * * If the #GstUDPSrc:timeout property is set to a value bigger than 0, udpsrc * will generate an element message named * "GstUDPSrcTimeout" * if no data was recieved in the given timeout. * The message's structure contains one field: * * * * #guint64 * "timeout": the timeout in microseconds that * expired when waiting for data. * * * * The message is typically used to detect that no UDP arrives in the receiver * because it is blocked by a firewall. * * A custom file descriptor can be configured with the * #GstUDPSrc:socket property. The socket will be closed when setting * the element to READY by default. This behaviour can be overriden * with the #GstUDPSrc:close-socket property, in which case the * application is responsible for closing the file descriptor. * * * Examples * |[ * gst-launch-1.0 -v udpsrc ! fakesink dump=1 * ]| A pipeline to read from the default port and dump the udp packets. * 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. * |[ * gst-launch-1.0 -v audiotestsrc ! udpsink * ]| * |[ * gst-launch-1.0 -v udpsrc port=0 ! fakesink * ]| read udp packets from a free port. * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include "gstudpsrc.h" #include #include /* not 100% correct, but a good upper bound for memory allocation purposes */ #define MAX_IPV4_UDP_PACKET_SIZE (65536 - 8) GST_DEBUG_CATEGORY_STATIC (udpsrc_debug); #define GST_CAT_DEFAULT (udpsrc_debug) static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS_ANY); #define UDP_DEFAULT_PORT 5004 #define UDP_DEFAULT_MULTICAST_GROUP "0.0.0.0" #define UDP_DEFAULT_MULTICAST_IFACE NULL #define UDP_DEFAULT_URI "udp://"UDP_DEFAULT_MULTICAST_GROUP":"G_STRINGIFY(UDP_DEFAULT_PORT) #define UDP_DEFAULT_CAPS NULL #define UDP_DEFAULT_SOCKET NULL #define UDP_DEFAULT_BUFFER_SIZE 0 #define UDP_DEFAULT_TIMEOUT 0 #define UDP_DEFAULT_SKIP_FIRST_BYTES 0 #define UDP_DEFAULT_CLOSE_SOCKET TRUE #define UDP_DEFAULT_USED_SOCKET NULL #define UDP_DEFAULT_AUTO_MULTICAST TRUE #define UDP_DEFAULT_REUSE TRUE #define UDP_DEFAULT_LOOP TRUE enum { PROP_0, PROP_PORT, PROP_MULTICAST_GROUP, PROP_MULTICAST_IFACE, PROP_URI, PROP_CAPS, PROP_SOCKET, PROP_BUFFER_SIZE, PROP_TIMEOUT, PROP_SKIP_FIRST_BYTES, PROP_CLOSE_SOCKET, PROP_USED_SOCKET, PROP_AUTO_MULTICAST, PROP_REUSE, PROP_ADDRESS, PROP_LOOP }; static void gst_udpsrc_uri_handler_init (gpointer g_iface, gpointer iface_data); static GstCaps *gst_udpsrc_getcaps (GstBaseSrc * src, GstCaps * filter); static GstFlowReturn gst_udpsrc_create (GstPushSrc * psrc, GstBuffer ** buf); static gboolean gst_udpsrc_close (GstUDPSrc * src); static gboolean gst_udpsrc_unlock (GstBaseSrc * bsrc); static gboolean gst_udpsrc_unlock_stop (GstBaseSrc * bsrc); static gboolean gst_udpsrc_negotiate (GstBaseSrc * basesrc); 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 GstStateChangeReturn gst_udpsrc_change_state (GstElement * element, GstStateChange transition); #define gst_udpsrc_parent_class parent_class G_DEFINE_TYPE_WITH_CODE (GstUDPSrc, gst_udpsrc, GST_TYPE_PUSH_SRC, G_IMPLEMENT_INTERFACE (GST_TYPE_URI_HANDLER, gst_udpsrc_uri_handler_init)); static void gst_udpsrc_class_init (GstUDPSrcClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; GstBaseSrcClass *gstbasesrc_class; GstPushSrcClass *gstpushsrc_class; gobject_class = (GObjectClass *) klass; gstelement_class = (GstElementClass *) klass; gstbasesrc_class = (GstBaseSrcClass *) klass; gstpushsrc_class = (GstPushSrcClass *) klass; GST_DEBUG_CATEGORY_INIT (udpsrc_debug, "udpsrc", 0, "UDP src"); 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_PARAM_STATIC_STRINGS)); /* FIXME 2.0: Remove multicast-group property */ #ifndef GST_REMOVE_DEPRECATED 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. (DEPRECATED: " "Use address property instead)", UDP_DEFAULT_MULTICAST_GROUP, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_DEPRECATED)); #endif g_object_class_install_property (gobject_class, PROP_MULTICAST_IFACE, g_param_spec_string ("multicast-iface", "Multicast Interface", "The network interface on which to join the multicast group", UDP_DEFAULT_MULTICAST_IFACE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); 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_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)); g_object_class_install_property (gobject_class, PROP_SOCKET, g_param_spec_object ("socket", "Socket", "Socket to use for UDP reception. (NULL == allocate)", G_TYPE_SOCKET, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); 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_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TIMEOUT, g_param_spec_uint64 ("timeout", "Timeout", "Post a message after timeout nanoseconds (0 = disabled)", 0, G_MAXUINT64, UDP_DEFAULT_TIMEOUT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); 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_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_CLOSE_SOCKET, g_param_spec_boolean ("close-socket", "Close socket", "Close socket if passed as property on state change", UDP_DEFAULT_CLOSE_SOCKET, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_USED_SOCKET, g_param_spec_object ("used-socket", "Socket Handle", "Socket currently in use for UDP reception. (NULL = no socket)", G_TYPE_SOCKET, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_AUTO_MULTICAST, g_param_spec_boolean ("auto-multicast", "Auto Multicast", "Automatically join/leave multicast groups", UDP_DEFAULT_AUTO_MULTICAST, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_REUSE, g_param_spec_boolean ("reuse", "Reuse", "Enable reuse of the port", UDP_DEFAULT_REUSE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_ADDRESS, g_param_spec_string ("address", "Address", "Address to receive packets for. This is equivalent to the " "multicast-group property for now", UDP_DEFAULT_MULTICAST_GROUP, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_LOOP, g_param_spec_boolean ("loop", "Multicast Loopback", "Used for setting the multicast loop parameter. TRUE = enable," " FALSE = disable", UDP_DEFAULT_LOOP, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); gst_element_class_add_static_pad_template (gstelement_class, &src_template); gst_element_class_set_static_metadata (gstelement_class, "UDP packet receiver", "Source/Network", "Receive data over the network via UDP", "Wim Taymans , " "Thijs Vermeir "); gstelement_class->change_state = gst_udpsrc_change_state; gstbasesrc_class->unlock = gst_udpsrc_unlock; gstbasesrc_class->unlock_stop = gst_udpsrc_unlock_stop; gstbasesrc_class->get_caps = gst_udpsrc_getcaps; gstbasesrc_class->negotiate = gst_udpsrc_negotiate; gstpushsrc_class->create = gst_udpsrc_create; } static void gst_udpsrc_init (GstUDPSrc * udpsrc) { udpsrc->uri = g_strdup_printf ("udp://%s:%u", UDP_DEFAULT_MULTICAST_GROUP, UDP_DEFAULT_PORT); udpsrc->address = g_strdup (UDP_DEFAULT_MULTICAST_GROUP); udpsrc->port = UDP_DEFAULT_PORT; udpsrc->socket = UDP_DEFAULT_SOCKET; udpsrc->multi_iface = g_strdup (UDP_DEFAULT_MULTICAST_IFACE); udpsrc->buffer_size = UDP_DEFAULT_BUFFER_SIZE; udpsrc->timeout = UDP_DEFAULT_TIMEOUT; udpsrc->skip_first_bytes = UDP_DEFAULT_SKIP_FIRST_BYTES; udpsrc->close_socket = UDP_DEFAULT_CLOSE_SOCKET; udpsrc->external_socket = (udpsrc->socket != NULL); udpsrc->auto_multicast = UDP_DEFAULT_AUTO_MULTICAST; udpsrc->used_socket = UDP_DEFAULT_USED_SOCKET; udpsrc->reuse = UDP_DEFAULT_REUSE; udpsrc->loop = UDP_DEFAULT_LOOP; /* configure basesrc to be a live source */ gst_base_src_set_live (GST_BASE_SRC (udpsrc), TRUE); /* make basesrc output a segment in time */ gst_base_src_set_format (GST_BASE_SRC (udpsrc), GST_FORMAT_TIME); /* make basesrc set timestamps on outgoing buffers based on the running_time * when they were captured */ 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); udpsrc->caps = NULL; g_free (udpsrc->multi_iface); udpsrc->multi_iface = NULL; g_free (udpsrc->uri); udpsrc->uri = NULL; g_free (udpsrc->address); udpsrc->address = NULL; if (udpsrc->socket) g_object_unref (udpsrc->socket); udpsrc->socket = NULL; if (udpsrc->used_socket) g_object_unref (udpsrc->used_socket); udpsrc->used_socket = NULL; G_OBJECT_CLASS (parent_class)->finalize (object); } static GstCaps * gst_udpsrc_getcaps (GstBaseSrc * src, GstCaps * filter) { GstUDPSrc *udpsrc; GstCaps *caps, *result; udpsrc = GST_UDPSRC (src); GST_OBJECT_LOCK (src); if ((caps = udpsrc->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 void gst_udpsrc_reset_memory_allocator (GstUDPSrc * src) { if (src->mem != NULL) { gst_memory_unmap (src->mem, &src->map); gst_memory_unref (src->mem); src->mem = NULL; } if (src->mem_max != NULL) { gst_memory_unmap (src->mem_max, &src->map_max); gst_memory_unref (src->mem_max); src->mem_max = NULL; } src->vec[0].buffer = NULL; src->vec[0].size = 0; src->vec[1].buffer = NULL; src->vec[1].size = 0; if (src->allocator != NULL) { gst_object_unref (src->allocator); src->allocator = NULL; } } static gboolean gst_udpsrc_negotiate (GstBaseSrc * basesrc) { GstUDPSrc *src = GST_UDPSRC_CAST (basesrc); gboolean ret; /* just chain up to the default implementation, we just want to * retrieve the allocator at the end of it (if there is one) */ ret = GST_BASE_SRC_CLASS (parent_class)->negotiate (basesrc); if (ret) { GstAllocationParams new_params; GstAllocator *new_allocator = NULL; /* retrieve new allocator */ gst_base_src_get_allocator (basesrc, &new_allocator, &new_params); if (src->allocator != new_allocator || memcmp (&src->params, &new_params, sizeof (GstAllocationParams)) != 0) { /* drop old allocator and throw away any memory allocated with it */ gst_udpsrc_reset_memory_allocator (src); /* and save the new allocator and/or new allocation parameters */ src->allocator = new_allocator; src->params = new_params; GST_INFO_OBJECT (src, "new allocator: %" GST_PTR_FORMAT, new_allocator); } } return ret; } static gboolean gst_udpsrc_alloc_mem (GstUDPSrc * src, GstMemory ** p_mem, GstMapInfo * map, gsize size) { GstMemory *mem; mem = gst_allocator_alloc (src->allocator, size, &src->params); if (!gst_memory_map (mem, map, GST_MAP_WRITE)) { gst_memory_unref (mem); memset (map, 0, sizeof (GstMapInfo)); return FALSE; } *p_mem = mem; return TRUE; } static gboolean gst_udpsrc_ensure_mem (GstUDPSrc * src) { if (src->mem == NULL) { gsize mem_size = 1500; /* typical max. MTU */ /* if packets are likely to be smaller, just use that size, otherwise * default to assuming incoming packets are around MTU size */ if (src->max_size > 0 && src->max_size < mem_size) mem_size = src->max_size; if (!gst_udpsrc_alloc_mem (src, &src->mem, &src->map, mem_size)) return FALSE; src->vec[0].buffer = src->map.data; src->vec[0].size = src->map.size; } if (src->mem_max == NULL) { gsize max_size = MAX_IPV4_UDP_PACKET_SIZE; if (!gst_udpsrc_alloc_mem (src, &src->mem_max, &src->map_max, max_size)) return FALSE; src->vec[1].buffer = src->map_max.data; src->vec[1].size = src->map_max.size; } return TRUE; } static void gst_udpsrc_create_cancellable (GstUDPSrc * src) { GPollFD pollfd; src->cancellable = g_cancellable_new (); src->made_cancel_fd = g_cancellable_make_pollfd (src->cancellable, &pollfd); } static void gst_udpsrc_free_cancellable (GstUDPSrc * src) { if (src->made_cancel_fd) { g_cancellable_release_fd (src->cancellable); src->made_cancel_fd = FALSE; } g_object_unref (src->cancellable); src->cancellable = NULL; } static GstFlowReturn gst_udpsrc_create (GstPushSrc * psrc, GstBuffer ** buf) { GstUDPSrc *udpsrc; GstBuffer *outbuf = NULL; GSocketAddress *saddr = NULL; gint flags = G_SOCKET_MSG_NONE; gboolean try_again; GError *err = NULL; gssize res; gsize offset; udpsrc = GST_UDPSRC_CAST (psrc); if (!gst_udpsrc_ensure_mem (udpsrc)) goto memory_alloc_error; retry: do { gint64 timeout; try_again = FALSE; if (udpsrc->timeout) timeout = udpsrc->timeout / 1000; else timeout = -1; GST_LOG_OBJECT (udpsrc, "doing select, timeout %" G_GINT64_FORMAT, timeout); if (!g_socket_condition_timed_wait (udpsrc->used_socket, G_IO_IN | G_IO_PRI, timeout, udpsrc->cancellable, &err)) { if (g_error_matches (err, G_IO_ERROR, G_IO_ERROR_BUSY) || g_error_matches (err, G_IO_ERROR, G_IO_ERROR_CANCELLED)) { goto stopped; } else if (g_error_matches (err, G_IO_ERROR, G_IO_ERROR_TIMED_OUT)) { g_clear_error (&err); /* 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))); } else { goto select_error; } try_again = TRUE; } } while (G_UNLIKELY (try_again)); if (saddr != NULL) { g_object_unref (saddr); saddr = NULL; } res = g_socket_receive_message (udpsrc->used_socket, &saddr, udpsrc->vec, 2, NULL, NULL, &flags, udpsrc->cancellable, &err); if (G_UNLIKELY (res < 0)) { /* G_IO_ERROR_HOST_UNREACHABLE for a UDP socket means that a packet sent * with udpsink generated a "port unreachable" ICMP response. We ignore * that and try again. * On Windows we get G_IO_ERROR_CONNECTION_CLOSED instead */ #if GLIB_CHECK_VERSION(2,44,0) if (g_error_matches (err, G_IO_ERROR, G_IO_ERROR_HOST_UNREACHABLE) || g_error_matches (err, G_IO_ERROR, G_IO_ERROR_CONNECTION_CLOSED)) { #else if (g_error_matches (err, G_IO_ERROR, G_IO_ERROR_HOST_UNREACHABLE)) { #endif g_clear_error (&err); goto retry; } goto receive_error; } /* remember maximum packet size */ if (res > udpsrc->max_size) udpsrc->max_size = res; outbuf = gst_buffer_new (); /* append first memory chunk to buffer */ gst_buffer_append_memory (outbuf, udpsrc->mem); /* if the packet didn't fit into the first chunk, add second one as well */ if (res > udpsrc->map.size) { gst_buffer_append_memory (outbuf, udpsrc->mem_max); gst_memory_unmap (udpsrc->mem_max, &udpsrc->map_max); udpsrc->vec[1].buffer = NULL; udpsrc->vec[1].size = 0; udpsrc->mem_max = NULL; } /* make sure we allocate a new chunk next time (we do this only here because * we look at map.size to see if the second memory chunk is needed above) */ gst_memory_unmap (udpsrc->mem, &udpsrc->map); udpsrc->vec[0].buffer = NULL; udpsrc->vec[0].size = 0; udpsrc->mem = NULL; offset = udpsrc->skip_first_bytes; if (G_UNLIKELY (offset > 0 && res < offset)) goto skip_error; gst_buffer_resize (outbuf, offset, res - offset); /* use buffer metadata so receivers can also track the address */ if (saddr) { gst_buffer_add_net_address_meta (outbuf, saddr); g_object_unref (saddr); saddr = NULL; } GST_LOG_OBJECT (udpsrc, "read packet of %d bytes", (int) res); *buf = GST_BUFFER_CAST (outbuf); return GST_FLOW_OK; /* ERRORS */ memory_alloc_error: { GST_ELEMENT_ERROR (udpsrc, RESOURCE, READ, (NULL), ("Failed to allocate or map memory")); return GST_FLOW_ERROR; } select_error: { GST_ELEMENT_ERROR (udpsrc, RESOURCE, READ, (NULL), ("select error: %s", err->message)); g_clear_error (&err); return GST_FLOW_ERROR; } stopped: { GST_DEBUG ("stop called"); g_clear_error (&err); return GST_FLOW_FLUSHING; } receive_error: { if (g_error_matches (err, G_IO_ERROR, G_IO_ERROR_BUSY) || g_error_matches (err, G_IO_ERROR, G_IO_ERROR_CANCELLED)) { g_clear_error (&err); return GST_FLOW_FLUSHING; } else { GST_ELEMENT_ERROR (udpsrc, RESOURCE, READ, (NULL), ("receive error %" G_GSSIZE_FORMAT ": %s", res, err->message)); g_clear_error (&err); return GST_FLOW_ERROR; } } skip_error: { gst_buffer_unref (outbuf); GST_ELEMENT_ERROR (udpsrc, STREAM, DECODE, (NULL), ("UDP buffer to small to skip header")); return GST_FLOW_ERROR; } } static gboolean gst_udpsrc_set_uri (GstUDPSrc * src, const gchar * uri, GError ** error) { gchar *address; guint16 port; if (!gst_udp_parse_uri (uri, &address, &port)) goto wrong_uri; if (port == (guint16) - 1) port = UDP_DEFAULT_PORT; g_free (src->address); src->address = address; src->port = port; g_free (src->uri); src->uri = g_strdup (uri); return TRUE; /* ERRORS */ wrong_uri: { GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL), ("error parsing uri %s", uri)); g_set_error_literal (error, GST_URI_ERROR, GST_URI_ERROR_BAD_URI, "Could not parse UDP URI"); 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); g_free (udpsrc->uri); udpsrc->uri = g_strdup_printf ("udp://%s:%u", udpsrc->address, udpsrc->port); break; case PROP_MULTICAST_GROUP: case PROP_ADDRESS: { const gchar *group; g_free (udpsrc->address); if ((group = g_value_get_string (value))) udpsrc->address = g_strdup (group); else udpsrc->address = g_strdup (UDP_DEFAULT_MULTICAST_GROUP); g_free (udpsrc->uri); udpsrc->uri = g_strdup_printf ("udp://%s:%u", udpsrc->address, udpsrc->port); break; } case PROP_MULTICAST_IFACE: g_free (udpsrc->multi_iface); if (g_value_get_string (value) == NULL) udpsrc->multi_iface = g_strdup (UDP_DEFAULT_MULTICAST_IFACE); else udpsrc->multi_iface = g_value_dup_string (value); break; case PROP_URI: gst_udpsrc_set_uri (udpsrc, g_value_get_string (value), NULL); 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 (udpsrc); old_caps = udpsrc->caps; udpsrc->caps = new_caps; GST_OBJECT_UNLOCK (udpsrc); if (old_caps) gst_caps_unref (old_caps); gst_pad_mark_reconfigure (GST_BASE_SRC_PAD (udpsrc)); break; } case PROP_SOCKET: if (udpsrc->socket != NULL && udpsrc->socket != udpsrc->used_socket && udpsrc->close_socket) { GError *err = NULL; if (!g_socket_close (udpsrc->socket, &err)) { GST_ERROR ("failed to close socket %p: %s", udpsrc->socket, err->message); g_clear_error (&err); } } if (udpsrc->socket) g_object_unref (udpsrc->socket); udpsrc->socket = g_value_dup_object (value); GST_DEBUG ("setting socket to %p", udpsrc->socket); 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_CLOSE_SOCKET: udpsrc->close_socket = g_value_get_boolean (value); break; case PROP_AUTO_MULTICAST: udpsrc->auto_multicast = g_value_get_boolean (value); break; case PROP_REUSE: udpsrc->reuse = g_value_get_boolean (value); break; case PROP_LOOP: udpsrc->loop = 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: case PROP_ADDRESS: g_value_set_string (value, udpsrc->address); break; case PROP_MULTICAST_IFACE: g_value_set_string (value, udpsrc->multi_iface); break; case PROP_URI: g_value_set_string (value, udpsrc->uri); break; case PROP_CAPS: GST_OBJECT_LOCK (udpsrc); gst_value_set_caps (value, udpsrc->caps); GST_OBJECT_UNLOCK (udpsrc); break; case PROP_SOCKET: g_value_set_object (value, udpsrc->socket); 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_CLOSE_SOCKET: g_value_set_boolean (value, udpsrc->close_socket); break; case PROP_USED_SOCKET: g_value_set_object (value, udpsrc->used_socket); break; case PROP_AUTO_MULTICAST: g_value_set_boolean (value, udpsrc->auto_multicast); break; case PROP_REUSE: g_value_set_boolean (value, udpsrc->reuse); break; case PROP_LOOP: g_value_set_boolean (value, udpsrc->loop); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static GInetAddress * gst_udpsrc_resolve (GstUDPSrc * src, const gchar * address) { GInetAddress *addr; GError *err = NULL; GResolver *resolver; addr = g_inet_address_new_from_string (address); if (!addr) { GList *results; GST_DEBUG_OBJECT (src, "resolving IP address for host %s", address); resolver = g_resolver_get_default (); results = g_resolver_lookup_by_name (resolver, address, src->cancellable, &err); if (!results) goto name_resolve; addr = G_INET_ADDRESS (g_object_ref (results->data)); g_resolver_free_addresses (results); g_object_unref (resolver); } #ifndef GST_DISABLE_GST_DEBUG { gchar *ip = g_inet_address_to_string (addr); GST_DEBUG_OBJECT (src, "IP address for host %s is %s", address, ip); g_free (ip); } #endif return addr; name_resolve: { GST_WARNING_OBJECT (src, "Failed to resolve %s: %s", address, err->message); g_clear_error (&err); g_object_unref (resolver); return NULL; } } /* create a socket for sending to remote machine */ static gboolean gst_udpsrc_open (GstUDPSrc * src) { GInetAddress *addr, *bind_addr; GSocketAddress *bind_saddr; GError *err = NULL; gst_udpsrc_create_cancellable (src); if (src->socket == NULL) { /* need to allocate a socket */ GST_DEBUG_OBJECT (src, "allocating socket for %s:%d", src->address, src->port); addr = gst_udpsrc_resolve (src, src->address); if (!addr) goto name_resolve; if ((src->used_socket = g_socket_new (g_inet_address_get_family (addr), G_SOCKET_TYPE_DATAGRAM, G_SOCKET_PROTOCOL_UDP, &err)) == NULL) goto no_socket; src->external_socket = FALSE; GST_DEBUG_OBJECT (src, "got socket %p", src->used_socket); if (src->addr) g_object_unref (src->addr); src->addr = G_INET_SOCKET_ADDRESS (g_inet_socket_address_new (addr, src->port)); GST_DEBUG_OBJECT (src, "binding on port %d", src->port); /* On Windows it's not possible to bind to a multicast address * but the OS will make sure to filter out all packets that * arrive not for the multicast address the socket joined. * * On Linux and others it is necessary to bind to a multicast * address to let the OS filter out all packets that are received * on the same port but for different addresses than the multicast * address */ #ifdef G_OS_WIN32 if (g_inet_address_get_is_multicast (addr)) bind_addr = g_inet_address_new_any (g_inet_address_get_family (addr)); else #endif bind_addr = G_INET_ADDRESS (g_object_ref (addr)); g_object_unref (addr); bind_saddr = g_inet_socket_address_new (bind_addr, src->port); g_object_unref (bind_addr); if (!g_socket_bind (src->used_socket, bind_saddr, src->reuse, &err)) goto bind_error; g_object_unref (bind_saddr); g_socket_set_multicast_loopback (src->used_socket, src->loop); } else { GInetSocketAddress *local_addr; GST_DEBUG_OBJECT (src, "using provided socket %p", src->socket); /* we use the configured socket, try to get some info about it */ src->used_socket = G_SOCKET (g_object_ref (src->socket)); src->external_socket = TRUE; local_addr = G_INET_SOCKET_ADDRESS (g_socket_get_local_address (src->used_socket, &err)); if (!local_addr) goto getsockname_error; /* See above for the reasons. Without this we would behave different on * Windows and Linux, joining multicast groups below for provided sockets * on Linux but not on Windows */ #ifdef G_OS_WIN32 addr = gst_udpsrc_resolve (src, src->address); if (!addr) goto name_resolve; if (!src->auto_multicast || !g_inet_address_get_is_any (g_inet_socket_address_get_address (local_addr)) || !g_inet_address_get_is_multicast (addr)) { g_object_unref (addr); #endif if (src->addr) g_object_unref (src->addr); src->addr = local_addr; #ifdef G_OS_WIN32 } else { g_object_unref (local_addr); if (src->addr) g_object_unref (src->addr); src->addr = G_INET_SOCKET_ADDRESS (g_inet_socket_address_new (addr, src->port)); g_object_unref (addr); } #endif } { gint val = 0; if (src->buffer_size != 0) { GError *opt_err = NULL; GST_INFO_OBJECT (src, "setting udp buffer of %d bytes", src->buffer_size); /* 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. */ if (!g_socket_set_option (src->used_socket, SOL_SOCKET, SO_RCVBUF, src->buffer_size, &opt_err)) { GST_ELEMENT_WARNING (src, RESOURCE, SETTINGS, (NULL), ("Could not create a buffer of requested %d bytes: %s", src->buffer_size, opt_err->message)); g_error_free (opt_err); opt_err = NULL; } } /* 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) */ if (g_socket_get_option (src->used_socket, SOL_SOCKET, SO_RCVBUF, &val, NULL)) { GST_INFO_OBJECT (src, "have udp buffer of %d bytes", val); } else { GST_DEBUG_OBJECT (src, "could not get udp buffer size"); } } g_socket_set_broadcast (src->used_socket, TRUE); if (src->auto_multicast && g_inet_address_get_is_multicast (g_inet_socket_address_get_address (src->addr))) { GST_DEBUG_OBJECT (src, "joining multicast group %s", src->address); if (!g_socket_join_multicast_group (src->used_socket, g_inet_socket_address_get_address (src->addr), FALSE, src->multi_iface, &err)) goto membership; } /* NOTE: sockaddr_in.sin_port works for ipv4 and ipv6 because sin_port * follows ss_family on both */ { GInetSocketAddress *addr; guint16 port; addr = G_INET_SOCKET_ADDRESS (g_socket_get_local_address (src->used_socket, &err)); if (!addr) goto getsockname_error; port = g_inet_socket_address_get_port (addr); GST_DEBUG_OBJECT (src, "bound, on port %d", port); if (port != src->port) { src->port = port; GST_DEBUG_OBJECT (src, "notifying port %d", port); g_object_notify (G_OBJECT (src), "port"); } g_object_unref (addr); } src->allocator = NULL; gst_allocation_params_init (&src->params); src->max_size = 0; return TRUE; /* ERRORS */ name_resolve: { return FALSE; } no_socket: { GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (NULL), ("no socket error: %s", err->message)); g_clear_error (&err); g_object_unref (addr); return FALSE; } bind_error: { GST_ELEMENT_ERROR (src, RESOURCE, SETTINGS, (NULL), ("bind failed: %s", err->message)); g_clear_error (&err); g_object_unref (bind_saddr); gst_udpsrc_close (src); return FALSE; } membership: { GST_ELEMENT_ERROR (src, RESOURCE, SETTINGS, (NULL), ("could add membership: %s", err->message)); g_clear_error (&err); gst_udpsrc_close (src); return FALSE; } getsockname_error: { GST_ELEMENT_ERROR (src, RESOURCE, SETTINGS, (NULL), ("getsockname failed: %s", err->message)); g_clear_error (&err); gst_udpsrc_close (src); return FALSE; } } static gboolean gst_udpsrc_unlock (GstBaseSrc * bsrc) { GstUDPSrc *src; src = GST_UDPSRC (bsrc); GST_LOG_OBJECT (src, "Flushing"); g_cancellable_cancel (src->cancellable); return TRUE; } static gboolean gst_udpsrc_unlock_stop (GstBaseSrc * bsrc) { GstUDPSrc *src; src = GST_UDPSRC (bsrc); GST_LOG_OBJECT (src, "No longer flushing"); gst_udpsrc_free_cancellable (src); gst_udpsrc_create_cancellable (src); return TRUE; } static gboolean gst_udpsrc_close (GstUDPSrc * src) { GST_DEBUG ("closing sockets"); if (src->used_socket) { if (src->auto_multicast && g_inet_address_get_is_multicast (g_inet_socket_address_get_address (src->addr))) { GError *err = NULL; GST_DEBUG_OBJECT (src, "leaving multicast group %s", src->address); if (!g_socket_leave_multicast_group (src->used_socket, g_inet_socket_address_get_address (src->addr), FALSE, src->multi_iface, &err)) { GST_ERROR_OBJECT (src, "Failed to leave multicast group: %s", err->message); g_clear_error (&err); } } if (src->close_socket || !src->external_socket) { GError *err = NULL; if (!g_socket_close (src->used_socket, &err)) { GST_ERROR_OBJECT (src, "Failed to close socket: %s", err->message); g_clear_error (&err); } } g_object_unref (src->used_socket); src->used_socket = NULL; g_object_unref (src->addr); src->addr = NULL; } gst_udpsrc_reset_memory_allocator (src); gst_udpsrc_free_cancellable (src); return TRUE; } static GstStateChangeReturn gst_udpsrc_change_state (GstElement * element, GstStateChange transition) { GstUDPSrc *src; GstStateChangeReturn result; src = GST_UDPSRC (element); switch (transition) { case GST_STATE_CHANGE_NULL_TO_READY: if (!gst_udpsrc_open (src)) goto open_failed; break; default: break; } if ((result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition)) == GST_STATE_CHANGE_FAILURE) goto failure; switch (transition) { case GST_STATE_CHANGE_READY_TO_NULL: gst_udpsrc_close (src); break; default: break; } return result; /* ERRORS */ open_failed: { GST_DEBUG_OBJECT (src, "failed to open socket"); return GST_STATE_CHANGE_FAILURE; } failure: { GST_DEBUG_OBJECT (src, "parent failed state change"); return result; } } /*** GSTURIHANDLER INTERFACE *************************************************/ static GstURIType gst_udpsrc_uri_get_type (GType type) { return GST_URI_SRC; } static const gchar *const * gst_udpsrc_uri_get_protocols (GType type) { static const gchar *protocols[] = { "udp", NULL }; return protocols; } static gchar * gst_udpsrc_uri_get_uri (GstURIHandler * handler) { GstUDPSrc *src = GST_UDPSRC (handler); return g_strdup (src->uri); } static gboolean gst_udpsrc_uri_set_uri (GstURIHandler * handler, const gchar * uri, GError ** error) { return gst_udpsrc_set_uri (GST_UDPSRC (handler), uri, error); } 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; }