1 /*****************************************************************************
2 * input_ts.h: structures of the input not exported to other modules
3 *****************************************************************************
4 * Copyright (C) 1999, 2000 VideoLAN
5 * $Id: input_ts.h,v 1.4 2001/12/27 03:47:09 massiot Exp $
7 * Authors: Henri Fallon <henri@via.ecp.fr>
8 * Boris Dorès <babal@via.ecp.fr>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
23 *****************************************************************************/
25 /* UDP packets contain 1500 bytes, that is 7 TS packets */
26 #define TS_READ_ONCE 7
29 # define BUFFER_SIZE (7 * TS_PACKET_SIZE)
32 /*****************************************************************************
33 * thread_ts_data_t: private input data
34 *****************************************************************************/
35 typedef struct thread_ts_data_s
37 /* The file descriptor we select() on */
41 char p_buffer[ BUFFER_SIZE ]; /* temporary buffer for readv_network */
42 int i_length; /* length of the UDP packet */
43 int i_offset; /* number of bytes already read from the buffer */
48 /*****************************************************************************
49 * network readv() replacement for iovec-impaired C libraries
50 *****************************************************************************/
52 static __inline__ int read_network( int i_fd, char * p_base,
53 thread_ts_data_t *p_sys, int i_len )
57 if( p_sys->i_offset >= p_sys->i_length )
59 p_sys->i_length = recv( i_fd, p_sys->p_buffer, BUFFER_SIZE, 0 );
60 if ( p_sys->i_length == SOCKET_ERROR )
67 if( i_len <= p_sys->i_length - p_sys->i_offset )
73 i_bytes = p_sys->i_length - p_sys->i_offset;
76 p_main->fast_memcpy( p_base, p_sys->p_buffer + p_sys->i_offset, i_bytes );
77 p_sys->i_offset += i_bytes;
82 static __inline__ int readv_network( int i_fd, struct iovec *p_iovec,
83 int i_count, thread_ts_data_t *p_sys )
85 int i_index, i_len, i_total = 0;
88 for( i_index = i_count; i_index; i_index-- )
90 register signed int i_bytes;
92 i_len = p_iovec->iov_len;
93 p_base = p_iovec->iov_base;
95 /* Loop is unrolled one time to spare the (i_bytes <= 0) test */
98 i_bytes = read_network( i_fd, p_base, p_sys, i_len );
100 if( ( i_total == 0 ) && ( i_bytes < 0 ) )
110 i_len -= i_bytes; i_total += i_bytes; p_base += i_bytes;
114 i_bytes = read_network( i_fd, p_base, p_sys, i_len );
121 i_len -= i_bytes; i_total += i_bytes; p_base += i_bytes;