gstreamer/subprojects/gst-plugins-bad/gst/unixfd/gstunixfd.c

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/* GStreamer unix file-descriptor source/sink
*
* Copyright (C) 2023 Netflix Inc.
* Author: Xavier Claessens <xavier.claessens@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.
*/
/**
* plugin-unixfd:
*
* Since: 1.24
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstunixfd.h"
#include <gio/gunixfdmessage.h>
#include <gio/gunixsocketaddress.h>
typedef struct
{
guint32 type;
guint32 payload_size;
} Command;
/* For backward compatibility, do not change the size of Command. It should have
* same size on 32bits and 64bits arches. */
G_STATIC_ASSERT (sizeof (Command) == 8);
G_STATIC_ASSERT (sizeof (MemoryPayload) == 16);
G_STATIC_ASSERT (sizeof (NewBufferPayload) == 56);
G_STATIC_ASSERT (sizeof (ReleaseBufferPayload) == 8);
gboolean
gst_unix_fd_send_command (GSocket * socket, CommandType type, GUnixFDList * fds,
const guint8 * payload, gsize payload_size, GError ** error)
{
Command command = { type, payload_size };
GOutputVector vect[] = {
{&command, sizeof (Command)},
{payload, payload_size},
};
GSocketControlMessage *msg = NULL;
gint num_msg = 0;
gboolean ret = TRUE;
if (fds != NULL) {
msg = g_unix_fd_message_new_with_fd_list (fds);
num_msg++;
}
if (g_socket_send_message (socket, NULL, vect, G_N_ELEMENTS (vect),
&msg, num_msg, G_SOCKET_MSG_NONE, NULL, error) < 0) {
ret = FALSE;
}
g_clear_object (&msg);
return ret;
}
gboolean
gst_unix_fd_receive_command (GSocket * socket, GCancellable * cancellable,
CommandType * type, GUnixFDList ** fds, guint8 ** payload,
gsize * payload_size, GError ** error)
{
Command command;
GInputVector vect = { &command, sizeof (Command) };
GSocketControlMessage **msg = NULL;
gint num_msg = 0;
gint flags = G_SOCKET_MSG_NONE;
gboolean ret = TRUE;
if (g_socket_receive_message (socket, NULL, &vect, 1, &msg, &num_msg, &flags,
cancellable, error) <= 0) {
return FALSE;
}
*type = command.type;
*payload = NULL;
*payload_size = 0;
if (command.payload_size > 0) {
*payload = g_malloc (command.payload_size);
*payload_size = command.payload_size;
if (g_socket_receive (socket, (gchar *) * payload, command.payload_size,
cancellable, error) < (gssize) command.payload_size) {
g_clear_pointer (payload, g_free);
ret = FALSE;
goto out;
}
}
if (fds != NULL) {
*fds = NULL;
for (int i = 0; i < num_msg; i++) {
if (G_IS_UNIX_FD_MESSAGE (msg[i])) {
if (*fds != NULL) {
g_set_error (error, GST_STREAM_ERROR, GST_STREAM_ERROR_FAILED,
"Received more than one fd message");
g_clear_pointer (payload, g_free);
g_clear_object (fds);
ret = FALSE;
goto out;
}
*fds = g_object_ref (g_unix_fd_message_get_fd_list ((GUnixFDMessage *)
msg[i]));
}
}
}
out:
for (int i = 0; i < num_msg; i++)
g_object_unref (msg[i]);
g_free (msg);
return ret;
}
gboolean
gst_unix_fd_parse_new_buffer (guint8 * payload, gsize payload_size,
NewBufferPayload ** new_buffer, guint32 * consumed)
{
if (payload == NULL || payload_size < sizeof (NewBufferPayload))
return FALSE;
*new_buffer = (NewBufferPayload *) payload;
gsize struct_size =
sizeof (NewBufferPayload) +
sizeof (MemoryPayload) * (*new_buffer)->n_memory;
if (payload_size < struct_size)
return FALSE;
*consumed = struct_size;
return TRUE;
}
gboolean
gst_unix_fd_parse_release_buffer (guint8 * payload, gsize payload_size,
ReleaseBufferPayload ** release_buffer)
{
if (payload == NULL || payload_size < sizeof (ReleaseBufferPayload))
return FALSE;
*release_buffer = (ReleaseBufferPayload *) payload;
return TRUE;
}
gboolean
gst_unix_fd_parse_caps (guint8 * payload, gsize payload_size, gchar ** caps_str)
{
if (payload == NULL || payload_size < 1 || payload[payload_size - 1] != '\0')
return FALSE;
*caps_str = (gchar *) payload;
return TRUE;
}
GSocket *
gst_unix_fd_socket_new (const gchar * socket_path,
GUnixSocketAddressType socket_type, GSocketAddress ** address,
GError ** error)
{
if (socket_path == NULL) {
g_set_error_literal (error, GST_STREAM_ERROR, GST_STREAM_ERROR_FAILED,
"Socket path is NULL");
return NULL;
}
switch (socket_type) {
case G_UNIX_SOCKET_ADDRESS_PATH:
case G_UNIX_SOCKET_ADDRESS_ABSTRACT:
case G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED:
*address =
g_unix_socket_address_new_with_type (socket_path, -1, socket_type);
break;
default:
{
gchar *str =
g_enum_to_string (G_TYPE_UNIX_SOCKET_ADDRESS_TYPE, socket_type);
g_set_error (error, GST_STREAM_ERROR, GST_STREAM_ERROR_FAILED,
"Unsupported UNIX socket type %s", str);
g_free (str);
return NULL;
}
}
GSocket *socket = g_socket_new (G_SOCKET_FAMILY_UNIX, G_SOCKET_TYPE_STREAM,
G_SOCKET_PROTOCOL_DEFAULT, error);
if (socket == NULL)
g_clear_object (address);
return socket;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
gboolean ret = FALSE;
ret |= GST_ELEMENT_REGISTER (unixfdsrc, plugin);
ret |= GST_ELEMENT_REGISTER (unixfdsink, plugin);
return ret;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
unixfd,
"Unix file descriptor sink and source",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)