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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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351 lines
9.8 KiB
C
351 lines
9.8 KiB
C
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/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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* Copyright (C) <2004> Thomas Vander Stichele <thomas at apestaart dot org>
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* Copyright (C) <2011> Collabora Ltd.
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* Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>
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* Copyright (C) <2014> William Manley <will@williammanley.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-socketsrc
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*
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* Receive data from a socket.
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*
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* As compared to other elements:
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*
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* socketsrc can be considered a source counterpart to the #multisocketsink
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* sink.
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*
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* socketsrc can also be considered a generalization of #tcpclientsrc and
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* #tcpserversrc: it contains all the logic required to communicate over the
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* socket but none of the logic for creating the sockets/establishing the
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* connection in the first place, allowing the user to accomplish this
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* externally in whatever manner they wish making it applicable to other types
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* of sockets besides TCP.
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*
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* As compared to #fdsrc socketsrc is socket specific and deals with #GSocket
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* objects rather than sockets via integer file-descriptors.
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*
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* @see_also: #multisocketsink
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/gst-i18n-plugin.h>
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#include "gstsocketsrc.h"
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#include "gsttcp.h"
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GST_DEBUG_CATEGORY_STATIC (socketsrc_debug);
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#define GST_CAT_DEFAULT socketsrc_debug
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#define MAX_READ_SIZE 4 * 1024
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static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS_ANY);
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enum
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{
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PROP_0,
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PROP_SOCKET,
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};
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#define gst_socket_src_parent_class parent_class
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G_DEFINE_TYPE (GstSocketSrc, gst_socket_src, GST_TYPE_PUSH_SRC);
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static void gst_socket_src_finalize (GObject * gobject);
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static GstFlowReturn gst_socket_src_create (GstPushSrc * psrc,
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GstBuffer ** outbuf);
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static gboolean gst_socket_src_unlock (GstBaseSrc * bsrc);
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static gboolean gst_socket_src_unlock_stop (GstBaseSrc * bsrc);
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static void gst_socket_src_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_socket_src_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static void
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gst_socket_src_class_init (GstSocketSrcClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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GstBaseSrcClass *gstbasesrc_class;
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GstPushSrcClass *gstpush_src_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gstbasesrc_class = (GstBaseSrcClass *) klass;
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gstpush_src_class = (GstPushSrcClass *) klass;
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gobject_class->set_property = gst_socket_src_set_property;
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gobject_class->get_property = gst_socket_src_get_property;
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gobject_class->finalize = gst_socket_src_finalize;
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g_object_class_install_property (gobject_class, PROP_SOCKET,
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g_param_spec_object ("socket", "Socket",
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"The socket to receive packets from", G_TYPE_SOCKET,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&srctemplate));
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gst_element_class_set_static_metadata (gstelement_class,
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"socket source", "Source/Network",
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"Receive data from a socket",
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"Thomas Vander Stichele <thomas at apestaart dot org>, "
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"William Manley <will@williammanley.net>");
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gstbasesrc_class->unlock = gst_socket_src_unlock;
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gstbasesrc_class->unlock_stop = gst_socket_src_unlock_stop;
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gstpush_src_class->create = gst_socket_src_create;
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GST_DEBUG_CATEGORY_INIT (socketsrc_debug, "socketsrc", 0, "Socket Source");
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}
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static void
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gst_socket_src_init (GstSocketSrc * this)
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{
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this->socket = NULL;
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this->cancellable = g_cancellable_new ();
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}
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static void
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gst_socket_src_finalize (GObject * gobject)
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{
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GstSocketSrc *this = GST_SOCKET_SRC (gobject);
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if (this->cancellable)
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g_object_unref (this->cancellable);
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this->cancellable = NULL;
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if (this->socket)
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g_object_unref (this->socket);
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this->socket = NULL;
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G_OBJECT_CLASS (parent_class)->finalize (gobject);
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}
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static GstFlowReturn
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gst_socket_src_create (GstPushSrc * psrc, GstBuffer ** outbuf)
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{
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GstSocketSrc *src;
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GstFlowReturn ret = GST_FLOW_OK;
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gssize rret;
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GError *err = NULL;
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GstMapInfo map;
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gssize avail, read;
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GSocket *socket;
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src = GST_SOCKET_SRC (psrc);
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GST_OBJECT_LOCK (src);
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socket = src->socket;
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if (socket == NULL) {
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GST_OBJECT_UNLOCK (src);
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goto no_socket;
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}
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g_object_ref (socket);
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GST_OBJECT_UNLOCK (src);
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GST_LOG_OBJECT (src, "asked for a buffer");
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/* read the buffer header */
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avail = g_socket_get_available_bytes (socket);
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if (avail < 0) {
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goto get_available_error;
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} else if (avail == 0) {
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GIOCondition condition;
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if (!g_socket_condition_wait (socket,
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G_IO_IN | G_IO_PRI | G_IO_ERR | G_IO_HUP, src->cancellable, &err))
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goto select_error;
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condition =
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g_socket_condition_check (socket,
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G_IO_IN | G_IO_PRI | G_IO_ERR | G_IO_HUP);
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if ((condition & G_IO_ERR)) {
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GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
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("Socket in error state"));
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*outbuf = NULL;
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ret = GST_FLOW_ERROR;
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goto done;
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} else if ((condition & G_IO_HUP)) {
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GST_DEBUG_OBJECT (src, "Connection closed");
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*outbuf = NULL;
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ret = GST_FLOW_EOS;
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goto done;
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}
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avail = g_socket_get_available_bytes (socket);
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if (avail < 0)
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goto get_available_error;
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}
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if (avail > 0) {
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read = MIN (avail, MAX_READ_SIZE);
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*outbuf = gst_buffer_new_and_alloc (read);
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gst_buffer_map (*outbuf, &map, GST_MAP_READWRITE);
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rret =
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g_socket_receive (socket, (gchar *) map.data, read,
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src->cancellable, &err);
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} else {
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/* Connection closed */
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*outbuf = NULL;
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read = 0;
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rret = 0;
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}
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if (rret == 0) {
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GST_DEBUG_OBJECT (src, "Connection closed");
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ret = GST_FLOW_EOS;
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if (*outbuf) {
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gst_buffer_unmap (*outbuf, &map);
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gst_buffer_unref (*outbuf);
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}
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*outbuf = NULL;
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} else if (rret < 0) {
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if (g_error_matches (err, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
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ret = GST_FLOW_FLUSHING;
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GST_DEBUG_OBJECT (src, "Cancelled reading from socket");
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} else {
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ret = GST_FLOW_ERROR;
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GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
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("Failed to read from socket: %s", err->message));
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}
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gst_buffer_unmap (*outbuf, &map);
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gst_buffer_unref (*outbuf);
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*outbuf = NULL;
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} else {
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ret = GST_FLOW_OK;
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gst_buffer_unmap (*outbuf, &map);
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gst_buffer_resize (*outbuf, 0, rret);
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GST_LOG_OBJECT (src,
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"Returning buffer from _get of size %" G_GSIZE_FORMAT ", ts %"
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GST_TIME_FORMAT ", dur %" GST_TIME_FORMAT
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", offset %" G_GINT64_FORMAT ", offset_end %" G_GINT64_FORMAT,
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gst_buffer_get_size (*outbuf),
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GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (*outbuf)),
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GST_TIME_ARGS (GST_BUFFER_DURATION (*outbuf)),
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GST_BUFFER_OFFSET (*outbuf), GST_BUFFER_OFFSET_END (*outbuf));
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}
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g_clear_error (&err);
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done:
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g_object_unref (socket);
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return ret;
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select_error:
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{
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if (g_error_matches (err, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
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GST_DEBUG_OBJECT (src, "Cancelled");
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ret = GST_FLOW_FLUSHING;
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} else {
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GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
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("Select failed: %s", err->message));
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ret = GST_FLOW_ERROR;
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}
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g_clear_error (&err);
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g_object_unref (socket);
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return ret;
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}
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get_available_error:
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{
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GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
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("Failed to get available bytes from socket"));
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g_object_unref (socket);
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return GST_FLOW_ERROR;
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}
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no_socket:
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{
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GST_ELEMENT_ERROR (src, RESOURCE, NOT_FOUND, (NULL),
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("Cannot receive: No socket set on socketsrc"));
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return GST_FLOW_ERROR;
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}
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}
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#define SWAP(a, b) do { GSocket* tmp = a; a = b; b = tmp; } while (0);
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static void
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gst_socket_src_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstSocketSrc *socketsrc = GST_SOCKET_SRC (object);
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switch (prop_id) {
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case PROP_SOCKET:{
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GSocket *socket = G_SOCKET (g_value_dup_object (value));
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GST_OBJECT_LOCK (socketsrc);
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SWAP (socket, socketsrc->socket);
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GST_OBJECT_UNLOCK (socketsrc);
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g_clear_object (&socket);
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break;
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}
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_socket_src_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstSocketSrc *socketsrc = GST_SOCKET_SRC (object);
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switch (prop_id) {
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case PROP_SOCKET:
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g_value_set_object (value, socketsrc->socket);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static gboolean
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gst_socket_src_unlock (GstBaseSrc * bsrc)
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{
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GstSocketSrc *src = GST_SOCKET_SRC (bsrc);
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GST_DEBUG_OBJECT (src, "set to flushing");
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g_cancellable_cancel (src->cancellable);
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return TRUE;
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}
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static gboolean
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gst_socket_src_unlock_stop (GstBaseSrc * bsrc)
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{
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GstSocketSrc *src = GST_SOCKET_SRC (bsrc);
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GST_DEBUG_OBJECT (src, "unset flushing");
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g_cancellable_reset (src->cancellable);
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return TRUE;
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}
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