LCOV - code coverage report
Current view: top level - libs/gst/net - gstnettimepacket.c (source / functions) Hit Total Coverage
Test: GStreamer 0.10.32.1 Lines: 26 33 78.8 %
Date: 2011-03-25 Functions: 4 4 100.0 %
Branches: 5 16 31.2 %

           Branch data     Line data    Source code
       1                 :            : /* GStreamer
       2                 :            :  * Copyright (C) 2005 Andy Wingo <wingo@pobox.com>
       3                 :            :  *
       4                 :            :  * This library is free software; you can redistribute it and/or
       5                 :            :  * modify it under the terms of the GNU Library General Public
       6                 :            :  * License as published by the Free Software Foundation; either
       7                 :            :  * version 2 of the License, or (at your option) any later version.
       8                 :            :  *
       9                 :            :  * This library is distributed in the hope that it will be useful,
      10                 :            :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      11                 :            :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12                 :            :  * Library General Public License for more details.
      13                 :            :  *
      14                 :            :  * You should have received a copy of the GNU Library General Public
      15                 :            :  * License along with this library; if not, write to the
      16                 :            :  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
      17                 :            :  * Boston, MA 02111-1307, USA.
      18                 :            :  */
      19                 :            : /**
      20                 :            :  * SECTION:gstnettimepacket
      21                 :            :  * @short_description: Helper structure to construct clock packets used
      22                 :            :  *                     by network clocks.
      23                 :            :  * @see_also: #GstClock, #GstNetClientClock, #GstNetTimeProvider
      24                 :            :  *
      25                 :            :  * Various functions for receiving, sending an serializing #GstNetTimePacket
      26                 :            :  * structures.
      27                 :            :  *
      28                 :            :  * Last reviewed on 2005-11-23 (0.9.5)
      29                 :            :  */
      30                 :            : 
      31                 :            : #ifdef HAVE_CONFIG_H
      32                 :            : #include "config.h"
      33                 :            : #endif
      34                 :            : 
      35                 :            : #include <glib.h>
      36                 :            : 
      37                 :            : #ifdef __CYGWIN__
      38                 :            : # include <unistd.h>
      39                 :            : # include <fcntl.h>
      40                 :            : #endif
      41                 :            : 
      42                 :            : #include "gstnettimepacket.h"
      43                 :            : 
      44                 :            : 
      45                 :            : /**
      46                 :            :  * gst_net_time_packet_new:
      47                 :            :  * @buffer: a buffer from which to construct the packet, or NULL
      48                 :            :  *
      49                 :            :  * Creates a new #GstNetTimePacket from a buffer received over the network. The
      50                 :            :  * caller is responsible for ensuring that @buffer is at least
      51                 :            :  * #GST_NET_TIME_PACKET_SIZE bytes long.
      52                 :            :  *
      53                 :            :  * If @buffer is #NULL, the local and remote times will be set to
      54                 :            :  * #GST_CLOCK_TIME_NONE.
      55                 :            :  *
      56                 :            :  * MT safe. Caller owns return value (g_free to free).
      57                 :            :  *
      58                 :            :  * Returns: The new #GstNetTimePacket.
      59                 :            :  */
      60                 :            : GstNetTimePacket *
      61                 :         99 : gst_net_time_packet_new (const guint8 * buffer)
      62                 :            : {
      63                 :            :   GstNetTimePacket *ret;
      64                 :            : 
      65                 :            :   g_assert (sizeof (GstClockTime) == 8);
      66                 :            : 
      67                 :         99 :   ret = g_new0 (GstNetTimePacket, 1);
      68                 :            : 
      69         [ +  + ]:         99 :   if (buffer) {
      70                 :         66 :     ret->local_time = GST_READ_UINT64_BE (buffer);
      71                 :         66 :     ret->remote_time = GST_READ_UINT64_BE (buffer + sizeof (GstClockTime));
      72                 :            :   } else {
      73                 :         33 :     ret->local_time = GST_CLOCK_TIME_NONE;
      74                 :         33 :     ret->remote_time = GST_CLOCK_TIME_NONE;
      75                 :            :   }
      76                 :            : 
      77                 :         99 :   return ret;
      78                 :            : }
      79                 :            : 
      80                 :            : /**
      81                 :            :  * gst_net_time_packet_serialize:
      82                 :            :  * @packet: the #GstNetTimePacket
      83                 :            :  *
      84                 :            :  * Serialized a #GstNetTimePacket into a newly-allocated sequence of
      85                 :            :  * #GST_NET_TIME_PACKET_SIZE bytes, in network byte order. The value returned is
      86                 :            :  * suitable for passing to write(2) or sendto(2) for communication over the
      87                 :            :  * network.
      88                 :            :  *
      89                 :            :  * MT safe. Caller owns return value (g_free to free).
      90                 :            :  *
      91                 :            :  * Returns: A newly allocated sequence of #GST_NET_TIME_PACKET_SIZE bytes.
      92                 :            :  */
      93                 :            : guint8 *
      94                 :         66 : gst_net_time_packet_serialize (const GstNetTimePacket * packet)
      95                 :            : {
      96                 :            :   guint8 *ret;
      97                 :            : 
      98                 :            :   g_assert (sizeof (GstClockTime) == 8);
      99                 :            : 
     100                 :         66 :   ret = g_new0 (guint8, GST_NET_TIME_PACKET_SIZE);
     101                 :            : 
     102                 :         66 :   GST_WRITE_UINT64_BE (ret, packet->local_time);
     103                 :         66 :   GST_WRITE_UINT64_BE (ret + sizeof (GstClockTime), packet->remote_time);
     104                 :            : 
     105                 :         66 :   return ret;
     106                 :            : }
     107                 :            : 
     108                 :            : /**
     109                 :            :  * gst_net_time_packet_receive:
     110                 :            :  * @fd: a file descriptor created by socket(2)
     111                 :            :  * @addr: a pointer to a sockaddr to hold the address of the sender
     112                 :            :  * @len: a pointer to the size of the data pointed to by @addr
     113                 :            :  *
     114                 :            :  * Receives a #GstNetTimePacket over a socket. Handles interrupted system calls,
     115                 :            :  * but otherwise returns NULL on error. See recvfrom(2) for more information on
     116                 :            :  * how to interpret @sockaddr.
     117                 :            :  *
     118                 :            :  * MT safe. Caller owns return value (g_free to free).
     119                 :            :  *
     120                 :            :  * Returns: The new #GstNetTimePacket.
     121                 :            :  */
     122                 :            : GstNetTimePacket *
     123                 :         66 : gst_net_time_packet_receive (gint fd, struct sockaddr * addr, socklen_t * len)
     124                 :            : {
     125                 :            :   guint8 buffer[GST_NET_TIME_PACKET_SIZE];
     126                 :            :   gint ret;
     127                 :            : 
     128                 :            :   while (TRUE) {
     129                 :            : #ifdef G_OS_WIN32
     130                 :            :     ret = recvfrom (fd, (char *) buffer, GST_NET_TIME_PACKET_SIZE,
     131                 :            : #else
     132                 :         66 :     ret = recvfrom (fd, buffer, GST_NET_TIME_PACKET_SIZE,
     133                 :            : #endif
     134                 :            :         0, (struct sockaddr *) addr, len);
     135         [ -  + ]:         66 :     if (ret < 0) {
     136 [ #  # ][ #  # ]:          0 :       if (errno != EAGAIN && errno != EINTR)
     137                 :            :         goto receive_error;
     138                 :            :       else
     139                 :          0 :         continue;
     140         [ -  + ]:         66 :     } else if (ret < GST_NET_TIME_PACKET_SIZE) {
     141                 :          0 :       goto short_packet;
     142                 :            :     } else {
     143                 :         66 :       return gst_net_time_packet_new (buffer);
     144                 :            :     }
     145                 :          0 :   }
     146                 :            : 
     147                 :            : receive_error:
     148                 :            :   {
     149         [ #  # ]:          0 :     GST_DEBUG ("receive error %d: %s (%d)", ret, g_strerror (errno), errno);
     150                 :          0 :     return NULL;
     151                 :            :   }
     152                 :            : short_packet:
     153                 :            :   {
     154         [ #  # ]:          0 :     GST_DEBUG ("someone sent us a short packet (%d < %d)",
     155                 :            :         ret, GST_NET_TIME_PACKET_SIZE);
     156                 :         66 :     return NULL;
     157                 :            :   }
     158                 :            : }
     159                 :            : 
     160                 :            : /**
     161                 :            :  * gst_net_time_packet_send:
     162                 :            :  * @packet: the #GstNetTimePacket
     163                 :            :  * @fd: a file descriptor created by socket(2)
     164                 :            :  * @addr: a pointer to a sockaddr to hold the address of the sender
     165                 :            :  * @len: the size of the data pointed to by @addr
     166                 :            :  *
     167                 :            :  * Sends a #GstNetTimePacket over a socket. Essentially a thin wrapper around
     168                 :            :  * sendto(2) and gst_net_time_packet_serialize(). 
     169                 :            :  *
     170                 :            :  * MT safe.
     171                 :            :  *
     172                 :            :  * Returns: The return value of sendto(2).
     173                 :            :  */
     174                 :            : gint
     175                 :         66 : gst_net_time_packet_send (const GstNetTimePacket * packet, gint fd,
     176                 :            :     struct sockaddr * addr, socklen_t len)
     177                 :            : {
     178                 :            : #if defined __CYGWIN__
     179                 :            :   gint fdflags;
     180                 :            : #elif defined G_OS_WIN32
     181                 :            :   gulong flags;
     182                 :            : #endif
     183                 :            : 
     184                 :            :   guint8 *buffer;
     185                 :            :   gint ret, send_flags;
     186                 :            : 
     187         [ -  + ]:         66 :   g_return_val_if_fail (packet != NULL, -EINVAL);
     188                 :            : 
     189                 :            : #ifdef __CYGWIN__
     190                 :            :   send_flags = 0;
     191                 :            :   fdflags = fcntl (fd, F_GETFL);
     192                 :            :   fcntl (fd, F_SETFL, fdflags | O_NONBLOCK);
     193                 :            : #elif defined G_OS_WIN32
     194                 :            :   flags = 1;
     195                 :            :   send_flags = 0;
     196                 :            : #else
     197                 :         66 :   send_flags = MSG_DONTWAIT;
     198                 :            : #endif
     199                 :            : 
     200                 :         66 :   buffer = gst_net_time_packet_serialize (packet);
     201                 :            : 
     202                 :            : #ifdef G_OS_WIN32
     203                 :            :   ioctlsocket (fd, FIONBIO, &flags);    /* Set nonblocking mode */
     204                 :            :   ret =
     205                 :            :       sendto (fd, (char *) buffer, GST_NET_TIME_PACKET_SIZE, send_flags, addr,
     206                 :            :       len);
     207                 :            : #else
     208                 :         66 :   ret = sendto (fd, buffer, GST_NET_TIME_PACKET_SIZE, send_flags, addr, len);
     209                 :            : #endif
     210                 :            : 
     211                 :            : #ifdef __CYGWIN__
     212                 :            :   fcntl (fd, F_SETFL, fdflags);
     213                 :            : #endif
     214                 :            : 
     215                 :         66 :   g_free (buffer);
     216                 :            : 
     217                 :         66 :   return ret;
     218                 :            : }

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